Title of Invention	OIL SEPARTOR, AIR TREATMENT SYSTEM AND COMPRESSED AIR SUPPLY SYSTEM
Abstract	The invention relates to an oil separator (10) for compressed air supply (12) on commercial vehicle, whereby the air purification unit comprises a valve housing (14) with at least one outlet connector (16) for a compressed air user (50) and a filter unit (18), which in particular serves for the drying of the compressed air for introduction to the compressed air user and the oil separator has an interface by means of which the same may be connected to the filter unit. According to the invention, the oil separator (10) has a further interface by means of which the same may be coupled to the valve housing (14). The invention further relates to an air purification unit (12) and a compressed air supply.

Title of Invention

OIL SEPARTOR, AIR TREATMENT SYSTEM AND COMPRESSED AIR SUPPLY SYSTEM

Abstract

The invention relates to an oil separator (10) for compressed air supply (12) on commercial vehicle, whereby the air purification unit comprises a valve housing (14) with at least one outlet connector (16) for a compressed air user (50) and a filter unit (18), which in particular serves for the drying of the compressed air for introduction to the compressed air user and the oil separator has an interface by means of which the same may be connected to the filter unit. According to the invention, the oil separator (10) has a further interface by means of which the same may be coupled to the valve housing (14). The invention further relates to an air purification unit (12) and a compressed air supply.

Full Text	WO 2006/099989 PCT/EP2006/002411 Oil separator, air treatment system and compressed air supply system The invention relates to an oil separator for an air treatment system of a utility vehicle, wherein the air treatment system has a valve housing with at least one outlet connector for a compressed air user and a filter unit which serves in particular to dry the compressed air which is to be fed to the compressed air user, and the oil separator has an interface by means of which it can be coupled to the filter unit. The invention also relates to an air treatment system and a compressed air supply system. Air treatment systems serve primarily to dehumidify the compressed air supplied by a compressor before said compressed air is fed to the compressed air users, in particular a brake system. Since the air which is supplied by the compressor is contaminated, it is desired to clean it before it is fed to the filter unit, and in this way the intention is to delay contamination of the filter unit. The compressed air which is supplied by the compressor is contaminated, for example, with oil which is used as a lubricant in the compressor, and further contaminants originate from the atmosphere, for example. It is known to use what is referred to as an oil separator to remove such contaminants as well as other contaminants, and the compressed air has to flow through said oil separator before the compressed air enters the filter unit. An example of such a cleaning device is specified in US 6,071,321. The oil separators which are specified in said document or constructed in a comparable fashion generally operate using centrifugal force. An air stream is fed with a tangential component to an WO 2006/099989 - 2 - PCT/EP2006/002411 essentially cylindrical chamber so that particles which are carried along by the air as a result of the centrifugal force are forced outward in accordance with the irrelatively high mass so that they can ultimately be precipitated on the wall of the chamber. The particles can then collect on the floor of the chamber and be carried away from there. Generally, attempts are made to ensure that as many as possible of the functions which have to be performed by a compressed air treatment system are integrated into a small number of components. Accordingly, US 6,071,321 has already proposed building the oil separator onto the filter unit. In accordance with the aforementioned desire for integration, modern air treatment systems from the prior art perform, in addition to the functions relating to the filtering of the compressed air, further functions which are associated with the pressure control and the protection of the compressed air user circuits. In this regard, a pressure controller and a multi-circuit protection valve form central components of an air treatment system alongside the filter unit, with the pressure controller and the multi-circuit protection valve being arranged in a valve housing. More wide ranging integration of components, that is to say for example of an oil separator in the air treatment system, would appear appropriate within the scope of modification of the valve housing. However, such modifications entail disadvantages since they require additional expenditure on cabling and changes to existing production strategies and sales and marketing strategies. The present invention is based on the object of making available an oil separator, an air treatment system and a compressed air supply system so that the oil WO 2006/099989 - 3 - PCT/EP2006/002411 separator can be integrated into the air treatment system in a particularly easy and reliable way, and in this context in particular the removal of the contamination collected in the oil separator is to be integrated into the functional sequences of the air treatment system. This object is achieved by means of the features of the independent claims. Advantageous embodiments of the invention are specified in the dependent claims. The invention builds on the oil separator of the generic type by virtue of the fact that the oil separator has a further interface by means of which it can be coupled to the valve housing. As a result, the oil separator can be configured in such a way that it can be used in conjunction with air treatment systems according to the prior art. In this regard it is particularly useful that the oil separator is arranged in the manner of a sandwich between the valve housing and the filter unit. Air treatment systems according to the prior art generally have a filter unit which is coupled to a valve housing via a flange like connection. By virtue of the fact that the oil separator is constructed in such a way that it permits both a flange like connection to the filter unit and a flange like connection to the valve housing it is possible to make available a compact air treatment system with an integrated oil separator. According to a particularly advantageous embodiment of the present invention there is provision for the oil separator to have an inlet connector by means of which a compressed air source can be coupled to the air treatment system. In air treatment systems according to WO 2006/099989 - 4 - PCT/EP2006/002411 the prior art, the inlet connector for the compressed air is conventionally arranged on the valve housing. On the basis of the invention it is possible, by including an inlet connector at the oil separator, to feed the compressed air directly on the shortest path to the component of the air treatment system in which the first processing of the compressed air takes place. Furthermore it is possible to provide for the oil separator to have an outlet connector. In this way, or in a comparable way, additional functions which conventionally have to be provided in the region of the valve housing can be assigned to the oil separator. In this context it is possible for the oil separator to have a connector at which unpurified compressed air can be extracted and/or compressed air which is to be purified can be fed to, in particular in order to inflate tires. Such a connector can usefully be employed as an outlet connector for all the functions, and it is possible to operate without difficulty with unpurified air with said connector. Likewise such an outlet connector can be used as a test connector. If the connector is used as an inlet connector, it is possible to feed compressed air via said connector, in particular from a source external to the vehicle, and said air is then purified in the oil separator. Furthermore it is useful that the oil separator has a safety valve. Such a safety valve can be configured with the aim of limiting the system pressure, and when there are very different pressure conditions within the air treatment system it is also possible to adopt an explicit configuration of the safety valve in order to achieve the maximum permitted pressure in the oil separator. WO 2006/099989 - 5 - PCT/EP2006/002411 According to a particularly preferred embodiment, the present invention is also developed in that the oil separator has a first space into which compressed air to be purified can be conducted, wherein air conducting means by means of which the flow speed of the through- flowing air can be varied are arranged in the first space, and in that the oil separator has a second space which air which has been purified in the first space can be fed to and by means of which the purified air can be fed to the filter unit. The precipitation of extraneous particles can be promoted by the air conducting means. By virtue of the fact that the compressed air flows through the oil separator at changing speeds it is possible for such particles to accumulate at an early time. Such accumulations increase the mass of the particles, which promotes their transportation to the outer side of the oil separator owing to the centrifugal force. A further space via which the purified air can then be fed to the filter unit is provided separately from the space equipped with the air conducting means, and a direct connection of the filter unit to the first space which conducts the impurities is therefore not necessary. It is particularly preferred that the first space and the second space are embodied as essentially axially symmetrical annular spaces with a common axis. In this regard, the air to be purified firstly flows through a radially outer annular space before it is fed to the filter unit in a purified form via the radially inner annular space. It is particularly useful that the compressed air can be fed to the first space with a tangential component. The tangential component within the first space is necessary in order to utilize the centrifugal force for precipitating the impurities. Even though the tangential component can basically be generated solely WO 2006/099989 - 6 - PCT/EP2006/002411 by the air conducting means which are arranged in the first space it is nevertheless useful to feed the compressed air to the first space with a tangential component from the outset. With regard to the structural configuration of the oil separator according to the invention it is particularly preferred for the air conducting means to have a plurality of air conducting elements whose main planes are arranged on various axial coordinates, for the air conducting elements to have air feed sections which extend put of their respective main plane, and for adjacent air feed sections of adjacent air conducting elements not to be parallel. Such air conducting elements can easily be manufactured, for example by punching circular ring like elements and then bending them appropriately. The nonparallel arrangement of adjacent air feed sections causes, on the essentially helix like path of the air through the first space, flow bottlenecks and regions in which a large flow cross section is available. In this regard, changes in speed occur which advantageously promote the accumulation of the particles. There is usefully provision for the angle between air feed sections and main planes to be between 10 and 20 degrees, and preferably to be 15 degrees. According to another particularly preferred embodiment of the present invention, said embodiment is developed - by virtue of the fact that at least some of the air conducting elements are of identical design, wherein the non-parallelism of the air feed sections of adjacent air conducting elements is implemented by means of a relative rotation of the air conducting elements with respect to one another. It is accordingly possible to use identical air conducting elements, which makes the manufacture of the oil separator WO 2006/099989 - 7 - PCT/EP2006/002411 particularly cost effective and reliable. The flow cross sections on the flow path of the compressed air through the first space can be varied solely by virtue of the relative rotation of the air conducting elements with respect to one another. It is particularly preferred that the internal diameter of the air conducting elements corresponds to the external diameter of an essentially cylindrical wall which separates the first space from the second space. In this way, the air conducting elements can be fitted onto the cylindrical wall in a positively locking and/or frictionally locking fashion, and additional attachment means can be provided between the air conducting elements and the cylindrical wall. It is also particularly preferred for the first space to have a floor region in which precipitated oil is collected and on which an outlet for extracting the collected oil is arranged. The precipitated oil, or to formulate this more generally, the precipitated impurities, therefore collect in the first space at a location from which the collected oil can be discharged directly. In this context it is particularly useful that the essentially cylindrical wall is of stepped design in the floor region of the first space. Such a stepped design of the cylindrical wall in the floor region of the first space prevents oil from creeping out within the first space and . prevents oil from creeping down from the first space into the second space. In this way renewed contamination of the compressed air which flows through the second space is avoided. For comparable reasons, there is provision for the junction between the first space and the second space to be formed by at least one tube which projects into WO 2006/099989 - 8 - PCT/EP2006/002411 the first space and which has at least one collar like protrusion on its outer side. The collar like protrusion or preferably the plurality of collar like protrusions also prevent oil from creeping out of the first space into the second space. The invention also relates to an air treatment system having an oil separator according to the invention and a compressed air supply system having an air treatment system according to the invention. The compressed air supply system according to the invention is particularly preferably developed in that the oil separator has an outlet which is coupled to an outlet opening of the valve housing in order to discharge precipitated substances. Air treatment systems according to the generic type have a discharge opening for regenerating the filter unit. In order to regenerate the air filter unit, air from the reservoir containers of the utility vehicle flows through the filter unit in a reverse direction, and the air then leaves the air treatment system via an outlet opening. According to the invention it is possible to provide for this outlet opening also to be used for removing from the oil separator the substances which have been precipitated in said oil separator. In this context it is, under certain circumstances, necessary to ensure that the substances which are frequently problematic in terms of the environment and which collect in the oil separator are not readily blown into the atmosphere. The invention is based on the recognition that by suitably configuring an oil separator with interfaces it is possible to retrofit conventional air treatment systems. WO 2006/099989 - 9 - PCT/EP2006/002411 The invention will be explained by way of example with reference to the accompanying drawings and by means of particularly preferred embodiments. In said drawings: figure 1 is a perspective illustration of an air treatment system according to the invention; figure 2 is a side view of an air treatment system according to the invention; figure 3 is a further side view of an air treatment system according to the invention; figure 4 is a plan view of the underside of an air treatment system according to the invention; figure 5 is a plan view of the upper side of an air treatment system according to the invention; figure 6 is a sectional view along the section line indicated by AA in figure 5; figure 7 is an exploded view of components arranged in a housing of an oil separator according to the invention; figure 8 is a perspective illustration of components which are arranged in a housing of an oil separator according to the invention; figure 9 is a perspective illustration of an air conducting element for use in an oil separator according to the invention; figure 10 is a plan view of an insert of an oil separator according to the invention; WO 2006/099989 - 10 - PCT/EP2006/002411 figure 11 is a sectional view along the section line indicated by BB in figure 10; figure 12 is a perspective illustration of a housing of an oil separator according to the invention; figure 13 is a further perspective illustration of a housing of an oil separator according to the invention; figure 14 is a perspective illustration of an oil separator according to the invention; figure 15 is a further perspective illustration of an oil separator according to the invention; and figure 16 is a schematic illustration of a compressed air supply system according to the invention. In the following detailed description of the invention with reference to the appended drawings, identical reference symbols designate identical or comparable components. Figure 1 shows a perspective illustration of an air treatment system according to the invention. Figure 2 is a side view of an air treatment system according to the invention. Figure 3 is a further side view of an air treatment system according to the invention. Figure 4 is a plan view of the underside of an air treatment system according to the invention. Figure 5 is a plan view of the upper side of an air treatment system according to the invention. Figure 6 is a sectional view along the section line indicated by AA in figure 5. The air treatment system 12 according to the invention comprises a filter unit 18 which is embodied as a dryer cartridge, a valve housing 14 and WO 2006/099989 - 11 - PCT/EP2006/002411 an oil separator 10 which is arranged in the manner of a sandwich between the filter unit 18 and the valve housing 14. The aforesaid components of the air treatment system 12 have interfaces which permit the components to be coupled in the way which is illustrated and described. In particular, the oil separator 10 has an interface for coupling to the filter unit 18, and an interface for coupling to the valve housing 14. The valve housing 14 has a further interface which faces away from the oil separator 10 and which can be seen in figure 4. The oil separator 10 has an inlet connector 20 by means of which compressed air from a compressor can be fed to the oil separator 10 and thus to the air treatment system 12. While the air treatment system 12 is operating, this inlet connector 20 which is arranged on the oil separator 10 replaces an inlet connector 54 which is arranged on the valve housing 14. In the case of air treatment systems according to the prior art, the filter unit 18 is coupled directly to the valve housing 14 without intermediate connection of an oil separator 20. If it is necessary to make available an inlet connector 54 on the valve housing 14. Since according to the invention an oil separator 10 is arranged between the filter unit 18 and the valve housing 14, the oil separator 10 can be equipped with an inlet connector 20 in order to feed the compressed air to be purified to the oil separator 10 on the shortest path. A further connector 22 which can be used as an extraneous inflation inlet connector and as a tire inflation outlet connector is provided on the oil separator 10. Compressed air which is to be purified can be fed to the latter from a source, which is for example external to the vehicle, or unpurified compressed air can be extracted at said connector for any desired purposes, for example for inflating tires. In addition, a safety valve 24 is provided. In the interior of the oil separator 10, a first space 26 and WO 2006/099989 - 12 - PCT/EP2006/002411 a second space 30 are provided, and these are connected to one another via tubes 46. In the first space 26 air conducting means 28 are arranged, the configuration and method of operation of which are explained in more detail with respect to drawings which are described below. The oil separator 10 thus comprises the main components of an external housing 60, of an insert 62 and of air conducting means 28 arranged on the insert 62 in the housing 60. While the air treatment system 12 is operating, compressed air is fed to the oil separator 10 via the inlet connector 20. The compressed air firstly flows into the first space 26 of the oil separator 10, with the air being given a tangential flow component immediately as it flows into the first space 26. As a result of the centrifugal force, contamination is driven to the inner wall of the housing 60. The contaminants then collect in the floor region 42 of the first space 26. An outlet 44 for extracting the precipitated contaminants is provided in the floor region 42 of the first space 26. The compressed air can flow out of the first space 26 into the second space 30 via the tubes 46, from where it can enter the filter unit 18 via outlet openings 56. After the compressed air has been dried in the filter unit 18 it flows via a central flow path 58 of the oil separator 10 into the valve unit 14 from where it is distributed in a known fashion among the various user circuits. Figure 7 shows an exploded illustration of components which are arranged in a housing of an oil separator according to the invention. Figure 8 shows a perspective illustration of components which are arranged in a housing of an oil separator according to the invention. Figure 9 shows a perspective illustration of an air conducting element for use in an oil separator according to the invention. The insert 62 WO 2006/099989 - 13 - PCT/EP2006/002411 has a cylindrical wall 40 and a collar 64 which extends from this wall 40. The collar 64 has a groove 66 so that in its state in which it is inserted into the housing 60 (see for example figure 6) the insert 62 seals off the first space 26 (see for example figure 6) . The cylindrical wall 40 ends with a stepped region 68 at its end facing away from the collar 64. Since the precipitated oil collects in the region of this stepped formation while the air treatment system is operating, said formation has the effect of preventing the oil from creeping up the cylindrical wall 40. Tubes 46, which have collar like protrusions 48 on their outer circumference, are provided for the compressed air to pass from the first space 26 (see for example figure 6) into- the second space 30 (see for example figure 6). The protrusions 48 are also provided for the purpose of preventing oil from creeping along the outer circumference of the tubes 4 6 and thus ultimately from passing over into the second space 30 (see for example figure 6) . The air conducting means 28 are implemented as four air conducting elements 32 of identical design. The internal diameter of the air conducting elements 32 corresponds essentially to the external diameter of the cylindrical wall 40 so that the air conducting elements 32 can be fitted onto the insert 26 in a positively locking and/or frictionally locking fashion. A main plane 34 is defined with each air conducting element 32. Air feed sections 36 extend from this main plane 34 alternately in different axial directions, with these air feed sections preferably enclosing an angle of approximately 15 degrees with the main plane 34. The air conducting elements 32 are of identical design but they are fitted onto the insert 62 in a "rotated" fashion. As a result, different flow cross sections are provided for the air which flows through the first space 26 (see for example figure 6), resulting in varying speeds. These varying speeds promote WO 2006/099989 - 14 - PCT/EP2006/002411 accumulation of the contaminants so that the transportation of said contaminants to the inner wall of the housing 60 (see for example figure 6) is promoted by virtue of the centrifugal force. The air conducting elements 32 can easily be manufactured, for example by means of a punching process and a subsequent bending process, and these processes can also be combined in a single work step using a suitable tool. Figure 10 shows a plan view of an insert 62 of an oil separator according to the invention. Figure 11 shows a sectional view along the section line indicated by BB in figure 10. It is possible to see, from the outside to the inside, the collar with its groove 26, the outlet openings 56, the second space 30 and the flow path 58. Furthermore, the stepped region 68 of the insert 62 can be seen. Figure 12 is a perspective illustration of a housing of an oil separator according to the invention. Figure 13 is a further perspective illustration of a housing of an oil separator according to the invention. The outer housing 60 of the oil separator has cooling ribs 70 which serve to transport heat away from the oil separator. Figure 14 is a perspective illustration of an oil separator according to the invention. Figure 15 shows a further perspective illustration of an oil separator according to the invention. The main components of the oil separator 10, specifically the insert 62, the air conducting means 28 and the outer housing 60 can be seen. Figure 16 is a schematic illustration of a compressed air supply system according to the invention. The air treatment system 12 according to the invention is constructed from a conventional air treatment system WO 2006/099989 - 15 - PCT/EP2006/002411 with valve housing 14 and filter unit 18 as well as an oil separator 10 according to the invention. Compressed air is fed to the air treatment system 12 from a compressed air source 52 via the oil separator 10. The purified and dried compressed air can then be fed to compressed air users 50. In order to extract contaminants which have collected in the oil separator 10 from said oil separator 10, a line 72 is provided via which the outlet 44 of the oil separator 10 is coupled to a venting means 74 of the air treatment system 12. The coupling is carried out via a valve 7 6, which can be configured, for example, as a 2/2 way valve. In order to extract the contaminants from the oil separator 12, a valve 78 which is arranged in the user line and which can also be configured as a 2/2 way valve is closed. This valve 7 8 can also be arranged inside the air treatment system 12. The valve 76 can then be opened so that the contaminants can be expelled from the oil separator via the venting means 74 by means of the compressed air which is supplied by the compressed air source 52. This venting means 7 4 is preferably the same venting means which is also used for the purpose of regenerating the filter unit 18. The features of the invention which are disclosed in the description above, in the drawings and in the claims can be essential to the implementation of the invention either individually or in any desired combination. WO 2006/099989 - 16 - PCT/EP2006/002411 List of reference numerals 10 oil separator 12 air treatment system 14 valve housing 16 outlet connector 18 filter unit 20 inlet connector 22 outlet connector 24 safety valve 26 first space 28 air conducting means 30 second space 32 air conducting element 34 main plane 36 air feed section 38 air feed section 40 cylindrical wall 42 floor region 44 outlet 4 6 tube 48 protrusion 50 compressed air user 52 compressed air source 54 inlet connector 56 outlet opening 58 flow path 60 housing 62 insert 64 collar 66 groove 68 stepped region 70 cooling ribs 72 line 74 venting means 7 6 valve 78 valve 17 International file number PCT/EP 2006/002411 2995-K PCT CLAIMS 1. An oil separator (10) for an air treatment system (12) for a utility vehicle, wherein the air treatment system has a valve housing (14) with at least one outlet connector (16) for a compressed air user (bO) and a filter unit (18) which serves in particular to dry the compressed air which is to be fed to the compressed air user, and the oil separator has an interface by means of which it can be coupled to the filter unit, and the oil separator (10) has a further interface by means of which it can be coupled to the valve housing (14), characterized in that the oil separator (10) has a safety valve (24). 2. The oil separator (10) as claimed in claim 1, characterized in that the oil separator (10) is arranged in the manner of a sandwich between the valve housing (14) and the filter unit (18). 3. The oil separator (10) as claimed in claim 1 or 2, characterized in that the oil separator (10) has an inlet connector (20) by means of which a compressed air source (52) can be coupled to the air treatment system (12). 4. The oil separator (10) as claimed in one of the preceding claims, characterized in that the oil separator (10) has an outlet connector (22) . 18 5. The oil separator (10) as claimed in one of the preceding claims, characterized in that the oil separator (10) has a connector (22) at which unpurified compressed air can be extracted and/or compressed air which is to be purified can be fed to, in particular in order to inflate tires. 6. The oil separator (10) as claimed in one of the preceding claims, characterized in that the oil separator (10) has a first space (26) into which compressed air to be purified can be conducted, wherein air conducting means (28) by means of which the flow speed of the through-flowing air can be varied are arranged in the first space (26), and in that the oil separator (10) has a second space (30) which air which has been purified in the first space (26) can be fed to and by means of which the purified air can be fed to the filter unit (18) . 7. The oil separator (10) as claimed in claim 6, characterized in that the first space (26) and the second space (30) are embodied as essentially axially symmetrical annular spaces with a common axis. 8. The oil separator (10) as claimed in claim 7, characterized in that the compressed air can be fed to the first space (26) with a tangential component. 9. The oil separator (10) as claimed in claim 7 or 8, characterized -19- in that the air conducting means (28) have a plurality of air conducting elements (32) whose main planes (34) are arranged on various axial coordinates, in that the air conducting elements have air feed sections (36, 38) which extend out of their respective main plane (34), and in that adjacent air feed sections (36, 38) of adjacent air conducting elements (32) are not parallel. 10. The oil separator (10) as claimed in claim 9,, characterized in that the angle between air feed sections (36, 38) and main planes (34) is between 10 and 20 degrees, and is preferably 15 degrees. 11. The oil separator (10) as claimed in claim 9 or 10, characterized in that at least some of the air conducting elements (32) are of identical design, wherein the non-parallelism of the air feed sections (36, 38) of adjacent air conducting elements (32) is implemented by means of a relative rotation of the air conducting elements with respect to one another. 12. The oil separator (10) as claimed in one of claims 9 to 11, characterized in that the internal diameter of the air conducting elements (32) corresponds to the external diameter of an essentially cylindrical wall (40) which separates the first space (26) from the second space (30). 13. The oil separator (10) as claimed in one of claims 6 to 12, characterized in that the first space (26) has a floor region (42) in which - 20- precipitated oil is collected and on which an outlet (44) for extracting the collected oil is arranged. 14. The oil separator (10) as claimed in claim 13, characterized in that the essentially cylindrical wall (40) is of stepped design in the floor region (42) of the first space (26) . 15. The oil separator (10) as claimed in one of claims 6 to 14, characterized in that the junction between the first space (26) and the second space (30) is formed by at least one tube (46) which projects into the first space and which has at least one collar like protrusion (48) on its outer side. 16. An air treatment system (12) having an oil separator (10) as claimed in one of the preceding claims. 17. A compressed air supply system having an air treatment system (12) as claimed in claim 16. 18. The compressed air supply system as claimed in claim 17, characterized in that the oil separator has an outlet 44 which is coupled to an outlet opening of the valve housing (14) in order to discharge precipitated substances. The invention relates to an oil separator (10) for compressed air supply (12) on commercial vehicle, whereby the air purification unit comprises a valve housing (14) with at least one outlet connector (16) for a compressed air user (50) and a filter unit (18), which in particular serves for the drying of the compressed air for introduction to the compressed air user and the oil separator has an interface by means of which the same may be connected to the filter unit. According to the invention, the oil separator (10) has a further interface by means of which the same may be coupled to the valve housing (14). The invention further relates to an air purification unit (12) and a compressed air supply.

Full Text

WO 2006/099989 PCT/EP2006/002411
Oil separator, air treatment system and
compressed air supply system
The invention relates to an oil separator for an air
treatment system of a utility vehicle, wherein the air
treatment system has a valve housing with at least one
outlet connector for a compressed air user and a filter
unit which serves in particular to dry the compressed
air which is to be fed to the compressed air user, and
the oil separator has an interface by means of which it
can be coupled to the filter unit.
The invention also relates to an air treatment system
and a compressed air supply system.
Air treatment systems serve primarily to dehumidify the
compressed air supplied by a compressor before said
compressed air is fed to the compressed air users, in
particular a brake system. Since the air which is
supplied by the compressor is contaminated, it is
desired to clean it before it is fed to the filter
unit, and in this way the intention is to delay
contamination of the filter unit. The compressed air
which is supplied by the compressor is contaminated,
for example, with oil which is used as a lubricant in
the compressor, and further contaminants originate from
the atmosphere, for example. It is known to use what is
referred to as an oil separator to remove such
contaminants as well as other contaminants, and the
compressed air has to flow through said oil separator
before the compressed air enters the filter unit.
An example of such a cleaning device is specified
in US 6,071,321. The oil separators which are specified
in said document or constructed in a comparable fashion
generally operate using centrifugal force. An air
stream is fed with a tangential component to an

WO 2006/099989 - 2 - PCT/EP2006/002411
essentially cylindrical chamber so that particles which
are carried along by the air as a result of the
centrifugal force are forced outward in accordance with
the irrelatively high mass so that they can ultimately
be precipitated on the wall of the chamber. The
particles can then collect on the floor of the chamber
and be carried away from there.
Generally, attempts are made to ensure that as many as
possible of the functions which have to be performed by
a compressed air treatment system are integrated into a
small number of components. Accordingly, US 6,071,321
has already proposed building the oil separator onto
the filter unit.
In accordance with the aforementioned desire for
integration, modern air treatment systems from the
prior art perform, in addition to the functions
relating to the filtering of the compressed air,
further functions which are associated with the
pressure control and the protection of the compressed
air user circuits. In this regard, a pressure
controller and a multi-circuit protection valve form
central components of an air treatment system alongside
the filter unit, with the pressure controller and the
multi-circuit protection valve being arranged in a
valve housing. More wide ranging integration of
components, that is to say for example of an oil
separator in the air treatment system, would appear
appropriate within the scope of modification of the
valve housing. However, such modifications entail
disadvantages since they require additional expenditure
on cabling and changes to existing production
strategies and sales and marketing strategies.
The present invention is based on the object of making
available an oil separator, an air treatment system and
a compressed air supply system so that the oil

WO 2006/099989 - 3 - PCT/EP2006/002411
separator can be integrated into the air treatment
system in a particularly easy and reliable way, and in
this context in particular the removal of the
contamination collected in the oil separator is to be
integrated into the functional sequences of the air
treatment system.
This object is achieved by means of the features of the
independent claims.
Advantageous embodiments of the invention are specified
in the dependent claims.
The invention builds on the oil separator of the
generic type by virtue of the fact that the oil
separator has a further interface by means of which it
can be coupled to the valve housing. As a result, the
oil separator can be configured in such a way that it
can be used in conjunction with air treatment systems
according to the prior art.
In this regard it is particularly useful that the oil
separator is arranged in the manner of a sandwich
between the valve housing and the filter unit. Air
treatment systems according to the prior art generally
have a filter unit which is coupled to a valve housing
via a flange like connection. By virtue of the fact
that the oil separator is constructed in such a way
that it permits both a flange like connection to the
filter unit and a flange like connection to the valve
housing it is possible to make available a compact air
treatment system with an integrated oil separator.
According to a particularly advantageous embodiment of
the present invention there is provision for the oil
separator to have an inlet connector by means of which
a compressed air source can be coupled to the air
treatment system. In air treatment systems according to

WO 2006/099989 - 4 - PCT/EP2006/002411
the prior art, the inlet connector for the compressed
air is conventionally arranged on the valve housing. On
the basis of the invention it is possible, by including
an inlet connector at the oil separator, to feed the
compressed air directly on the shortest path to the
component of the air treatment system in which the
first processing of the compressed air takes place.
Furthermore it is possible to provide for the oil
separator to have an outlet connector. In this way, or
in a comparable way, additional functions which
conventionally have to be provided in the region of the
valve housing can be assigned to the oil separator.
In this context it is possible for the oil separator to
have a connector at which unpurified compressed air can
be extracted and/or compressed air which is to be
purified can be fed to, in particular in order to
inflate tires. Such a connector can usefully be
employed as an outlet connector for all the functions,
and it is possible to operate without difficulty with
unpurified air with said connector. Likewise such an
outlet connector can be used as a test connector. If
the connector is used as an inlet connector, it is
possible to feed compressed air via said connector, in
particular from a source external to the vehicle, and
said air is then purified in the oil separator.
Furthermore it is useful that the oil separator has a
safety valve. Such a safety valve can be configured
with the aim of limiting the system pressure, and when
there are very different pressure conditions within the
air treatment system it is also possible to adopt an
explicit configuration of the safety valve in order to
achieve the maximum permitted pressure in the oil
separator.

WO 2006/099989 - 5 - PCT/EP2006/002411
According to a particularly preferred embodiment, the
present invention is also developed in that the oil
separator has a first space into which compressed air
to be purified can be conducted, wherein air conducting
means by means of which the flow speed of the through-
flowing air can be varied are arranged in the first
space, and in that the oil separator has a second space
which air which has been purified in the first space
can be fed to and by means of which the purified air
can be fed to the filter unit. The precipitation of
extraneous particles can be promoted by the air
conducting means. By virtue of the fact that the
compressed air flows through the oil separator at
changing speeds it is possible for such particles to
accumulate at an early time. Such accumulations
increase the mass of the particles, which promotes
their transportation to the outer side of the oil
separator owing to the centrifugal force. A further
space via which the purified air can then be fed to the
filter unit is provided separately from the space
equipped with the air conducting means, and a direct
connection of the filter unit to the first space which
conducts the impurities is therefore not necessary.
It is particularly preferred that the first space and
the second space are embodied as essentially axially
symmetrical annular spaces with a common axis. In this
regard, the air to be purified firstly flows through a
radially outer annular space before it is fed to the
filter unit in a purified form via the radially inner
annular space.
It is particularly useful that the compressed air can
be fed to the first space with a tangential component.
The tangential component within the first space is
necessary in order to utilize the centrifugal force for
precipitating the impurities. Even though the
tangential component can basically be generated solely

WO 2006/099989 - 6 - PCT/EP2006/002411
by the air conducting means which are arranged in the
first space it is nevertheless useful to feed the
compressed air to the first space with a tangential
component from the outset.
With regard to the structural configuration of the oil
separator according to the invention it is particularly
preferred for the air conducting means to have a
plurality of air conducting elements whose main planes
are arranged on various axial coordinates, for the air
conducting elements to have air feed sections which
extend put of their respective main plane, and for
adjacent air feed sections of adjacent air conducting
elements not to be parallel. Such air conducting
elements can easily be manufactured, for example by
punching circular ring like elements and then bending
them appropriately. The nonparallel arrangement of
adjacent air feed sections causes, on the essentially
helix like path of the air through the first space,
flow bottlenecks and regions in which a large flow
cross section is available. In this regard, changes in
speed occur which advantageously promote the
accumulation of the particles.
There is usefully provision for the angle between air
feed sections and main planes to be between 10 and 20
degrees, and preferably to be 15 degrees.
According to another particularly preferred embodiment
of the present invention, said embodiment is developed
- by virtue of the fact that at least some of the air
conducting elements are of identical design, wherein
the non-parallelism of the air feed sections of
adjacent air conducting elements is implemented by
means of a relative rotation of the air conducting
elements with respect to one another. It is accordingly
possible to use identical air conducting elements,
which makes the manufacture of the oil separator

WO 2006/099989 - 7 - PCT/EP2006/002411
particularly cost effective and reliable. The flow
cross sections on the flow path of the compressed air
through the first space can be varied solely by virtue
of the relative rotation of the air conducting elements
with respect to one another.
It is particularly preferred that the internal diameter
of the air conducting elements corresponds to the
external diameter of an essentially cylindrical wall
which separates the first space from the second space.
In this way, the air conducting elements can be fitted
onto the cylindrical wall in a positively locking
and/or frictionally locking fashion, and additional
attachment means can be provided between the air
conducting elements and the cylindrical wall.
It is also particularly preferred for the first space
to have a floor region in which precipitated oil is
collected and on which an outlet for extracting the
collected oil is arranged. The precipitated oil, or to
formulate this more generally, the precipitated
impurities, therefore collect in the first space at a
location from which the collected oil can be discharged
directly.
In this context it is particularly useful that the
essentially cylindrical wall is of stepped design in
the floor region of the first space. Such a stepped
design of the cylindrical wall in the floor region of
the first space prevents oil from creeping out within
the first space and . prevents oil from creeping down
from the first space into the second space. In this way
renewed contamination of the compressed air which flows
through the second space is avoided.
For comparable reasons, there is provision for the
junction between the first space and the second space
to be formed by at least one tube which projects into

WO 2006/099989 - 8 - PCT/EP2006/002411
the first space and which has at least one collar like
protrusion on its outer side. The collar like
protrusion or preferably the plurality of collar like
protrusions also prevent oil from creeping out of the
first space into the second space.
The invention also relates to an air treatment system
having an oil separator according to the invention and
a compressed air supply system having an air treatment
system according to the invention.
The compressed air supply system according to the
invention is particularly preferably developed in that
the oil separator has an outlet which is coupled to an
outlet opening of the valve housing in order to
discharge precipitated substances. Air treatment
systems according to the generic type have a discharge
opening for regenerating the filter unit. In order to
regenerate the air filter unit, air from the reservoir
containers of the utility vehicle flows through the
filter unit in a reverse direction, and the air then
leaves the air treatment system via an outlet opening.
According to the invention it is possible to provide
for this outlet opening also to be used for removing
from the oil separator the substances which have been
precipitated in said oil separator. In this context it
is, under certain circumstances, necessary to ensure
that the substances which are frequently problematic in
terms of the environment and which collect in the oil
separator are not readily blown into the atmosphere.
The invention is based on the recognition that by
suitably configuring an oil separator with interfaces
it is possible to retrofit conventional air treatment
systems.

WO 2006/099989 - 9 - PCT/EP2006/002411
The invention will be explained by way of example with
reference to the accompanying drawings and by means of
particularly preferred embodiments.
In said drawings:
figure 1 is a perspective illustration of an air
treatment system according to the invention;
figure 2 is a side view of an air treatment system
according to the invention;
figure 3 is a further side view of an air treatment
system according to the invention;
figure 4 is a plan view of the underside of an air
treatment system according to the invention;
figure 5 is a plan view of the upper side of an air
treatment system according to the invention;
figure 6 is a sectional view along the section line
indicated by AA in figure 5;
figure 7 is an exploded view of components arranged in
a housing of an oil separator according to
the invention;
figure 8 is a perspective illustration of components
which are arranged in a housing of an oil
separator according to the invention;
figure 9 is a perspective illustration of an air
conducting element for use in an oil
separator according to the invention;
figure 10 is a plan view of an insert of an oil
separator according to the invention;

WO 2006/099989 - 10 - PCT/EP2006/002411
figure 11 is a sectional view along the section line
indicated by BB in figure 10;
figure 12 is a perspective illustration of a housing of
an oil separator according to the invention;
figure 13 is a further perspective illustration of a
housing of an oil separator according to the
invention;
figure 14 is a perspective illustration of an oil
separator according to the invention;
figure 15 is a further perspective illustration of an
oil separator according to the invention; and
figure 16 is a schematic illustration of a compressed
air supply system according to the invention.
In the following detailed description of the invention
with reference to the appended drawings, identical
reference symbols designate identical or comparable
components.
Figure 1 shows a perspective illustration of an air
treatment system according to the invention. Figure 2
is a side view of an air treatment system according to
the invention. Figure 3 is a further side view of an
air treatment system according to the invention.
Figure 4 is a plan view of the underside of an air
treatment system according to the invention. Figure 5
is a plan view of the upper side of an air treatment
system according to the invention. Figure 6 is a
sectional view along the section line indicated by AA
in figure 5. The air treatment system 12 according to
the invention comprises a filter unit 18 which is
embodied as a dryer cartridge, a valve housing 14 and

WO 2006/099989 - 11 - PCT/EP2006/002411
an oil separator 10 which is arranged in the manner of
a sandwich between the filter unit 18 and the valve
housing 14. The aforesaid components of the air
treatment system 12 have interfaces which permit the
components to be coupled in the way which is
illustrated and described. In particular, the oil
separator 10 has an interface for coupling to the
filter unit 18, and an interface for coupling to the
valve housing 14. The valve housing 14 has a further
interface which faces away from the oil separator 10
and which can be seen in figure 4. The oil separator 10
has an inlet connector 20 by means of which compressed
air from a compressor can be fed to the oil
separator 10 and thus to the air treatment system 12.
While the air treatment system 12 is operating, this
inlet connector 20 which is arranged on the oil
separator 10 replaces an inlet connector 54 which is
arranged on the valve housing 14. In the case of air
treatment systems according to the prior art, the
filter unit 18 is coupled directly to the valve
housing 14 without intermediate connection of an oil
separator 20. If it is necessary to make available an
inlet connector 54 on the valve housing 14. Since
according to the invention an oil separator 10 is
arranged between the filter unit 18 and the valve
housing 14, the oil separator 10 can be equipped with
an inlet connector 20 in order to feed the compressed
air to be purified to the oil separator 10 on the
shortest path. A further connector 22 which can be used
as an extraneous inflation inlet connector and as a
tire inflation outlet connector is provided on the oil
separator 10. Compressed air which is to be purified
can be fed to the latter from a source, which is for
example external to the vehicle, or unpurified
compressed air can be extracted at said connector for
any desired purposes, for example for inflating tires.
In addition, a safety valve 24 is provided. In the
interior of the oil separator 10, a first space 26 and

WO 2006/099989 - 12 - PCT/EP2006/002411
a second space 30 are provided, and these are connected
to one another via tubes 46. In the first space 26 air
conducting means 28 are arranged, the configuration and
method of operation of which are explained in more
detail with respect to drawings which are described
below. The oil separator 10 thus comprises the main
components of an external housing 60, of an insert 62
and of air conducting means 28 arranged on the insert
62 in the housing 60.
While the air treatment system 12 is operating,
compressed air is fed to the oil separator 10 via the
inlet connector 20. The compressed air firstly flows
into the first space 26 of the oil separator 10, with
the air being given a tangential flow component
immediately as it flows into the first space 26. As a
result of the centrifugal force, contamination is
driven to the inner wall of the housing 60. The
contaminants then collect in the floor region 42 of the
first space 26. An outlet 44 for extracting the
precipitated contaminants is provided in the floor
region 42 of the first space 26. The compressed air can
flow out of the first space 26 into the second space 30
via the tubes 46, from where it can enter the filter
unit 18 via outlet openings 56. After the compressed
air has been dried in the filter unit 18 it flows via a
central flow path 58 of the oil separator 10 into the
valve unit 14 from where it is distributed in a known
fashion among the various user circuits.
Figure 7 shows an exploded illustration of components
which are arranged in a housing of an oil separator
according to the invention. Figure 8 shows a
perspective illustration of components which are
arranged in a housing of an oil separator according to
the invention. Figure 9 shows a perspective
illustration of an air conducting element for use in an
oil separator according to the invention. The insert 62

WO 2006/099989 - 13 - PCT/EP2006/002411
has a cylindrical wall 40 and a collar 64 which extends
from this wall 40. The collar 64 has a groove 66 so
that in its state in which it is inserted into the
housing 60 (see for example figure 6) the insert 62
seals off the first space 26 (see for example
figure 6) . The cylindrical wall 40 ends with a stepped
region 68 at its end facing away from the collar 64.
Since the precipitated oil collects in the region of
this stepped formation while the air treatment system
is operating, said formation has the effect of
preventing the oil from creeping up the cylindrical
wall 40. Tubes 46, which have collar like
protrusions 48 on their outer circumference, are
provided for the compressed air to pass from the first
space 26 (see for example figure 6) into- the second
space 30 (see for example figure 6). The protrusions 48
are also provided for the purpose of preventing oil
from creeping along the outer circumference of the
tubes 4 6 and thus ultimately from passing over into the
second space 30 (see for example figure 6) . The air
conducting means 28 are implemented as four air
conducting elements 32 of identical design. The
internal diameter of the air conducting elements 32
corresponds essentially to the external diameter of the
cylindrical wall 40 so that the air conducting elements
32 can be fitted onto the insert 26 in a positively
locking and/or frictionally locking fashion. A main
plane 34 is defined with each air conducting element
32. Air feed sections 36 extend from this main plane 34
alternately in different axial directions, with these
air feed sections preferably enclosing an angle of
approximately 15 degrees with the main plane 34. The
air conducting elements 32 are of identical design but
they are fitted onto the insert 62 in a "rotated"
fashion. As a result, different flow cross sections are
provided for the air which flows through the first
space 26 (see for example figure 6), resulting in
varying speeds. These varying speeds promote

WO 2006/099989 - 14 - PCT/EP2006/002411
accumulation of the contaminants so that the
transportation of said contaminants to the inner wall
of the housing 60 (see for example figure 6) is
promoted by virtue of the centrifugal force. The air
conducting elements 32 can easily be manufactured, for
example by means of a punching process and a subsequent
bending process, and these processes can also be
combined in a single work step using a suitable tool.
Figure 10 shows a plan view of an insert 62 of an oil
separator according to the invention. Figure 11 shows a
sectional view along the section line indicated by BB
in figure 10. It is possible to see, from the outside
to the inside, the collar with its groove 26, the
outlet openings 56, the second space 30 and the flow
path 58. Furthermore, the stepped region 68 of the
insert 62 can be seen.
Figure 12 is a perspective illustration of a housing of
an oil separator according to the invention. Figure 13
is a further perspective illustration of a housing of
an oil separator according to the invention. The outer
housing 60 of the oil separator has cooling ribs 70
which serve to transport heat away from the oil
separator.
Figure 14 is a perspective illustration of an oil
separator according to the invention. Figure 15 shows a
further perspective illustration of an oil separator
according to the invention. The main components of the
oil separator 10, specifically the insert 62, the air
conducting means 28 and the outer housing 60 can be
seen.
Figure 16 is a schematic illustration of a compressed
air supply system according to the invention. The air
treatment system 12 according to the invention is
constructed from a conventional air treatment system

WO 2006/099989 - 15 - PCT/EP2006/002411
with valve housing 14 and filter unit 18 as well as an
oil separator 10 according to the invention. Compressed
air is fed to the air treatment system 12 from a
compressed air source 52 via the oil separator 10. The
purified and dried compressed air can then be fed to
compressed air users 50. In order to extract
contaminants which have collected in the oil
separator 10 from said oil separator 10, a line 72 is
provided via which the outlet 44 of the oil
separator 10 is coupled to a venting means 74 of the
air treatment system 12. The coupling is carried out
via a valve 7 6, which can be configured, for example,
as a 2/2 way valve. In order to extract the
contaminants from the oil separator 12, a valve 78
which is arranged in the user line and which can also
be configured as a 2/2 way valve is closed. This
valve 7 8 can also be arranged inside the air treatment
system 12. The valve 76 can then be opened so that the
contaminants can be expelled from the oil separator via
the venting means 74 by means of the compressed air
which is supplied by the compressed air source 52. This
venting means 7 4 is preferably the same venting means
which is also used for the purpose of regenerating the
filter unit 18.
The features of the invention which are disclosed in
the description above, in the drawings and in the
claims can be essential to the implementation of the
invention either individually or in any desired
combination.

WO 2006/099989 - 16 - PCT/EP2006/002411
List of reference numerals
10 oil separator
12 air treatment system
14 valve housing
16 outlet connector
18 filter unit
20 inlet connector
22 outlet connector
24 safety valve
26 first space
28 air conducting means
30 second space
32 air conducting element
34 main plane
36 air feed section
38 air feed section
40 cylindrical wall
42 floor region
44 outlet
4 6 tube
48 protrusion
50 compressed air user
52 compressed air source
54 inlet connector
56 outlet opening
58 flow path
60 housing
62 insert
64 collar
66 groove
68 stepped region
70 cooling ribs
72 line
74 venting means
7 6 valve
78 valve

17
International file number PCT/EP 2006/002411
2995-K PCT
CLAIMS
1. An oil separator (10) for an air treatment
system (12) for a utility vehicle, wherein
the air treatment system has
a valve housing (14) with at least one outlet
connector (16) for a compressed air user (bO)
and
a filter unit (18) which serves in particular
to dry the compressed air which is to be fed to
the compressed air user, and
the oil separator has an interface by means of
which it can be coupled to the filter unit, and the oil
separator (10) has a further interface by means of
which it can be coupled to the valve housing (14),
characterized in that the oil separator (10) has a
safety valve (24).
2. The oil separator (10) as claimed in claim 1,
characterized in that the oil separator (10) is
arranged in the manner of a sandwich between the valve
housing (14) and the filter unit (18).
3. The oil separator (10) as claimed in claim 1 or 2,
characterized in that the oil separator (10) has an
inlet connector (20) by means of which a compressed air
source (52) can be coupled to the air treatment
system (12).
4. The oil separator (10) as claimed in one of the
preceding claims, characterized in that the oil
separator (10) has an outlet connector (22) .

18
5. The oil separator (10) as claimed in one of the
preceding claims, characterized in that the oil
separator (10) has a connector (22) at which unpurified
compressed air can be extracted and/or compressed air
which is to be purified can be fed to, in particular in
order to inflate tires.
6. The oil separator (10) as claimed in one of the
preceding claims, characterized
in that the oil separator (10) has a first
space (26) into which compressed air to be
purified can be conducted, wherein air conducting
means (28) by means of which the flow speed of the
through-flowing air can be varied are arranged in
the first space (26), and
in that the oil separator (10) has a second
space (30) which air which has been purified in
the first space (26) can be fed to and by means of
which the purified air can be fed to the filter
unit (18) .
7. The oil separator (10) as claimed in claim 6,
characterized in that the first space (26) and the
second space (30) are embodied as essentially axially
symmetrical annular spaces with a common axis.
8. The oil separator (10) as claimed in claim 7,
characterized in that the compressed air can be fed to
the first space (26) with a tangential component.
9. The oil separator (10) as claimed in claim 7 or 8,
characterized

-19-
in that the air conducting means (28) have a
plurality of air conducting elements (32) whose
main planes (34) are arranged on various axial
coordinates,
in that the air conducting elements have air feed
sections (36, 38) which extend out of their
respective main plane (34), and
in that adjacent air feed sections (36, 38) of
adjacent air conducting elements (32) are not
parallel.
10. The oil separator (10) as claimed in claim 9,,
characterized in that the angle between air feed
sections (36, 38) and main planes (34) is between 10
and 20 degrees, and is preferably 15 degrees.
11. The oil separator (10) as claimed in claim 9
or 10, characterized in that at least some of the air
conducting elements (32) are of identical design,
wherein the non-parallelism of the air feed
sections (36, 38) of adjacent air conducting
elements (32) is implemented by means of a relative
rotation of the air conducting elements with respect to
one another.
12. The oil separator (10) as claimed in one of
claims 9 to 11, characterized in that the internal
diameter of the air conducting elements (32)
corresponds to the external diameter of an essentially
cylindrical wall (40) which separates the first
space (26) from the second space (30).
13. The oil separator (10) as claimed in one of
claims 6 to 12, characterized in that the first
space (26) has a floor region (42) in which

- 20-
precipitated oil is collected and on which an outlet
(44) for extracting the collected oil is arranged.
14. The oil separator (10) as claimed in claim 13,
characterized in that the essentially cylindrical
wall (40) is of stepped design in the floor region (42)
of the first space (26) .
15. The oil separator (10) as claimed in one of
claims 6 to 14, characterized in that the junction
between the first space (26) and the second space (30)
is formed by at least one tube (46) which projects into
the first space and which has at least one collar like
protrusion (48) on its outer side.
16. An air treatment system (12) having an oil
separator (10) as claimed in one of the preceding
claims.
17. A compressed air supply system having an air
treatment system (12) as claimed in claim 16.
18. The compressed air supply system as claimed in
claim 17, characterized in that the oil separator has
an outlet 44 which is coupled to an outlet opening of
the valve housing (14) in order to discharge
precipitated substances.

The invention relates to an oil separator (10) for compressed air supply (12) on
commercial vehicle, whereby the air purification unit comprises a valve housing
(14) with at least one outlet connector (16) for a compressed air user (50) and a
filter unit (18), which in particular serves for the drying of the compressed air for
introduction to the compressed air user and the oil separator has an interface by
means of which the same may be connected to the filter unit. According to the
invention, the oil separator (10) has a further interface by means of which the
same may be coupled to the valve housing (14). The invention further relates to
an air purification unit (12) and a compressed air supply.

Documents:

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Patent Number

272433

Indian Patent Application Number

3564/KOLNP/2007

PG Journal Number

14/2016

Publication Date

01-Apr-2016

Grant Date

31-Mar-2016

Date of Filing

21-Sep-2007

Name of Patentee

KNORR-BREMSE SYSTEME FUR NUTZFAHRZEUGE GMBH

Applicant Address

MOOSACHER STR. 80, 80809 MUNCHEN

Inventors:

#	Inventor's Name	Inventor's Address
1	RATATICS, GABOR	GYOZELEM U.4 H-6000 KECSKEMET
2	MUSER, MICHAEL	HERZOG-WILHELM-STR. 15 85276 PFAFFENHOFEN

PCT International Classification Number

B01D 45/16

PCT International Application Number

PCT/EP2006/002411

PCT International Filing date

2006-03-16

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10 2005 013 473.4	2005-03-21	Germany