Title of Invention

CYLINDER HEAD FOR AN INTERNAL COMBUSTION ENGINE

Abstract

.; A cylinder head (1) for an internal combustion engine with at least one cylinder head base (3) which is arranged in a housing (2) and in which at least one aperture of a gas exchange port (14, 15) is provided, with the cylinder head base (3) and a housing (2) consisting of different materials, characterized in that the cylinder head base (3) is provided with at least one positive-locking zone (6, 6a, 6b, 6c) and the cylinder head base (3) is cast into the housing (2).

Full Text

FORM 2 THE PATENTS ACT 1970 [39 OF 1970] COMPLETE SPECIFICATION CYLINDER HEAD FOR AN INTERNAL COMBUSTION ENGINE AVL LIST GMBH, a Firm according to Austrian Law, Hans-List-Platz 1, A-8020 Graz, Austria The following specification particularly describes the nature of the invention and the manner in which it is to be performed : - GRANTED 9/5/2005 The invention relates to a cylinder head for an internal combustion engine with at least one cylinder head base which is arranged in a housing and in which at least one aperture of a gas exchange port is provided, with the cylinder head base and the housing consisting of different materials. From EP 0 120 223 A2 a cylinder head is known with a cylinder head base which is pressed into the cylinder head housing and is arranged as a circular plate. The plate produced by sintering is used as a heat-insulating component. Valve seats made of steel are' embedded in the plate which is substantially made of mullite. Furthermore, a composite cylinder head-for internal combustion engines with a two-piece cylinder head is known from US 4 774.912, which cylinder head is provided with a cylinder head base which is connected with the cylinder head housing. The cylinder head base consists of a material which is provided with a higher strength than the cylinder head housing. The disadvantage in known cylinder heads with a separately arranged cylinder head base is that in some cases a detachment of the connection occurs between the cylinder head base and the cylinder head housing. It is therefore the object of the present invention to avoid such disadvantages and to further develop a cylinder head base of the kind mentioned above in such a way that a secure and non-detachable connection is produced between the cylinder head base and the ambient housing. This occurs in accordance with the invention in such a way that the cylinder head base is provided with at least one positive-locking zone and the cylinder head base is cast into the housing. This leads to a positive connection between the cylinder head base and the housing, thus avoiding any detachment of the connection even after longer periods of operation. A secure connection can also be achieved in such a way in particular that the positive-locking zone is provided with at least one projection and/or a recess of the edge of the cylinder head base. Manufacturing is particularly simple when the positive-locking part is provided with an annular circular arrangement. It is provided that a positive-locking zone is arranged on the jacket of the cylinder head base. Further positive-locking zones can be moulded, at the side averted from the combustion chamber, into the zone of the edge and into the zone of the aperture of the gas exchange ports in the cylinder head base. Such positive- locking zones around the gas exchange ports are also used for preventing oil leakages. It is provided for in a particularly preferable embodiment that the cylinder head base consists of a single material and the valve seat surfaces for the gas exchange valves are incorporated into the cylinder head base. It is thus possible to omit separate detachable valve seat rings. This allows providing the distance between the apertures of the gas exchange ports in the cylinder head base with a considerably! smaller size than when using valve seat rings, thus enabling the aperature cross section of the gas exchange ports to be provided with a substantially larger arrangement. The gain in cross-sectional surface can be up to 50% and more. In a further development of the invention it can be provided that the cylinder head base is provided with at least one aperture for a component which opens into the combustion chamber, preferably for a spark plug and/or an injection valve, and the pocket for fastening the mounting part is provided with an integral arrangement with the cylinder head base. Mounting parts such as spark plugs and/or injection valves can thus be directly fastened to the cylinder head base. A particular simple way of production can be obtained when at least one valve guide body to form the valve guidance for the gas exchange valves is arranged integrally with the cylinder head base. The valve guide body can thus be cast jointly with the cylinder head base into the housing without requiring any further positioning measures. In order to achieve a secure connection between the valve guide body and the ambient housing it is provided that the valve guide body is provided on the outside with a positive-locking body, preferably in form of an at least circular swelling. The connection between the valve guide body and the cylinder head floor can occur preferably by way of a bridge. A further particularly preferable embodiment provides that a cylinder face bushing is arranged integrally with, the cylinder head base. A secure connection with the housing is achieved in such a way that at least one positive-locking zone is arranged on the outer side of the Cylinder ' face bushing. The cylinder head base is preferably made of cast iron, e.g. from grey cast iron with lamellar, spheroidal or vermicular graphite or from cast steel. The housing can be made of light metal, e.g. of aluminium.. i The gas exchange ports are formed in such a way that their walls can be produced by a steel chill. After the casting process, the steel; chill is drawn out of the gas exchange ports either in the shape of an arc or in a straight line. The production of the cylinder head is performed in such a way that the cylinder head base, which is preferably made of an iron material, is placed in a permanent casting mould and is cast-in with the material for the housing. The cylinder head base is preheated prior to the casting in and, optionally, is also etched slightly on the surface in order to achieve a favourable metallic bonding with the cast-in material. Therefore, the present invention relates to a cylinder head for an internal combustion engine with at least one cylinder head base which is arranged in a housing and in which at least one aperture of a gas exchange port is provided, with the cylinder head base and the housing consisting of different materials, characterized in that the cylinder head base is provided with at least one positive-locking zone and the cylinder head base is cast into the housing. The invention is now explained below in closer detail by reference to the enclosed drawings, wherein: BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Fig. 1 shows a cylinder head base in an oblique view of an intersected cylinder head arranged in accordance with the invention; Fig. 2 shows the cylinder head base in a horizontal projection; Fig. 3 shows a further oblique view of the cylinder head base; Fig. 4 shows a side view of the cylinder head base; iFig. 5 shows a sectional view! through the cylinder head in an embodiment in accordance with line V-V in fig. 4 and Fig. 6 shows an analogous sectional view through a cylinder head in a further embodiment in accordance with the invention. Cylinder head 1 consists of a housing 2 and a cylinder head base 3 cast into the housing 2. A piston which is reciprocatable in a cylinder 5 and is adjacent to the combustion chamber 5a is designated with reference numeral 4. The cylinder head 1 can be arranged as a cylinder-head- and-cylinder unit and the cylinder 5 as a pocket hole cylinder, as is shown in fig. 1. Piston 4 is provided in the embodiment as shown in fig. 1 with a piston ring 4a having an L-shaped cross section, thus allowing further compression rings to be omitted. The cylinder head base 3 is provided in the zone of its jacket 3a with a positive-locking zone 6 which is formed by its circular projection 7 and through which the cylinder head base 3 is positively connected with the cylinder head 1. A pocket 8 for receiving a mounting part 9 such as a spark plug or an injection valve is arranged integrally with the cylinder head base 3. The aperture of the mounting part 9 has the reference numeral 9a. Further positive-locking zones 6a and 6b are provided in the zone of edge 3c on the face side 3b averted from the combustion chamber 5a and around the gas exchange ports 14, 15 in the cylinder head base 3. Valve guide bodies 10 are further arranged integrally with the cylinder head base 3 for guiding gas exchange valves 11, 12. Valve guide bodies 10 are provided with swelling-like positive-locking bodies 16 on their outer sides and are connected with the cylinder head base 3 by way of an arc-shaped bridge 13. Fig. 5 shows an embodiment in which with a two-part arrangement. the cylinder head 1 and the cylinder 5 are provided In the embodiment as shown in fig. 6; the cylinder head base 3 is made integrally with a cylinder face bushing 5c receiving a piston 4. In order to bring about a fixed bonding with the cast-in material of housing 2, the cylinder face bushing 5c is provided on its outer side with annular positive-locking zones 6c. An inlet and outlet port are designated in the figures with the reference numerals 14 and 15. The walls 14a, 15a of the outlet port 14 and the inlet port 15 can also be provided with an integral arrangement with the cylinder head base 3. Outlet ports 14 and inlet ports 15 should be arranged in such a way that they can be produced by means of drawing dies. The steel chills can be removed from the casting process either in the shape of an arc or in a straight line from the gas exchange ports. Grey cast iron with lamellar, spheroidal! or vermicular graphite or cast steel can be used as a material for the cylinder head base 3. The cylinder head 1 can be made of aluminium for example. To produce the cylinder head l, the prefabricated cylinder head base 3 is preheated, superficially etched, placed into the steel ingot mould and cast in with pressure diecasting with the material of housing 2. A particularly favourable metallic bonding with housing 2 is achieved by the etching and the preheating of the surface. WE CLAIM: 1.; A cylinder head (1) for an internal combustion engine with at least one cylinder head base (3) which is arranged in a housing (2) and in which at least one aperture of a gas exchange port (14, 15) is provided, with the cylinder head base (3) and a housing (2) consisting of different materials, characterized in that the cylinder head base (3) is provided with at least one positive-locking zone (6, 6a, 6b, 6c) and the cylinder head base (3) is cast into the housing (2). 2. A cylinder head as claimed in claim 1, wherein the said positive - locking zone (6, 6a, 6b, 66) is provided with at least one projection (6') and /or recess of the cylinder head base (3). 3. A cylinder head as claimed in claim 1 or 2, wherein the said positive- locking part (6, 6a, 6b, :6c) is provided with an annularly circular arrangement. I 4. A cylinder head as claimed in one of the claims 1 to 3, wherein the said positive-locking zone (6) is arranged on the jacket (3a) of the cylinder head base (3). 5. A cylinder head as claimed in on of the claims 1 to 4, wherein the said positive-locking zone (6a) is arranged on a face side (3b) of the said cylinder head base (3) which is averted from the combustion chamber i (5a), preferably in the zone of the edge (3c). 6. A cylinder head as claimed in one of the claims 1 to 5, wherein the said positive-locking zone (6b) is arranged on the said cylinder head base in the zone of a gas exchange port (14, 15). 7. . A cylinder head as claimed in one of the claims 1 to 6, wherein the said cylinder head base (3) is made from a single material and the valve seat surfaces for the gas exchange valves (11,12) are incorporated in the cylinder head base (3). 8. A cylinder head as claimed in one of the claims 1 to 7, wherein the said cylinder head base (3) is provided with at least one aperture (9a) for a mounting part (8), which opens into the combustion chamber (5a), preferably for a spark plug and/or an injection valve, and the pocket (8) is arranged for fastening the mounting part (9) is provided with an integral arrangement with the cylinder head base (3). 9. A cylinder head as claimed in one of the claims 1 to 8, wherein at least one valve guide body (10) to form the valve guidance for the gas exchange valves (11,12) is arranged integrally with the cylinder head base (3). A cylinder head as claimed in claim 9, wherein the said valve guide body (10) is provided on the outside with a positive-locking body (16), preferably in the form of at least one circular swelling. A cylinder head as claimed in claim 9 or 10, wherein the said valve guide body (10) is connected with the cylinder head base (3) by way of abridge (13). A cylinder head as claimed in one of the claims 1 to 11, wherein the said wall (14a, 15a) of at least one gas exchange port (14, 15) is arranged integrally with the said cylinder head base (3). A cylinder head as claimed in one of the claims 1 to 12, wherein the said wall (14a, 15a) of at! least one gas exchange port (14,15) can be made from a steel chill which can be drawn in the shape of an arc or in a straight line. A cylinder head as claimed in one of the claims 1 to 13, wherein a cylinder face bushing (5c):is arranged integrally with the cylinder head base (3). A cylinder head as claimed in claim 14, wherein at least one positive- locking zone (6c) is arranged on the outer side of the-cylinder face bushing (5c). 16. A cylinder head for an internal combustion engine substantially as herein described with reference to the accompanying drawings. Dated this 17th day of April, 2000. [RANJNA MEHTA-DUTT] OF REMFRY & SAGAR ATTORNEY FOR THE APPLICANTS

Documents:

355-mum-2000-cancelled pages(9-5-2005).pdf

355-mum-2000-claims(granted)-(9-5-2005).doc

355-mum-2000-claims(granted)-(9-5-2005).pdf

355-mum-2000-correspondence(14-3-2006).pdf

355-mum-2000-correspondence(ipo)-(22-06-2007).pdf

355-mum-2000-drawing(9-5-2005).pdf

355-mum-2000-form 1(17-4-2000).pdf

355-mum-2000-form 19(24-3-2004).pdf

355-mum-2000-form 2(granted)-(9-5-2005).doc

355-mum-2000-form 2(granted)-(9-5-2005).pdf

355-mum-2000-form 3(17-4-2000).pdf

355-mum-2000-form 3(9-11-2004).pdf

355-mum-2000-form 5(17-4-2000).pdf

355-mum-2000-petition under rule 137(9-11-2004).pdf

355-mum-2000-petition under rule 138(9-11-2004).pdf

355-mum-2000-power of authority(18-4-2000).pdf

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