Title of Invention	DEVICE FOR CONNECTING AN ELECTRIC MOTOR INTENDED FOR USE IN A FUEL TANK, IN PARTICULAR OF A MOTOR VEHICLE
Abstract	The subject matter of the invention is a device (8) for connecting an electric motor (1) intended for use in a fuel tank in particular of a motor vehicle, with connection contacts (9, 10), with carbon brushes (6,7) sliding over an armature (5) of a rotor (3), and with electrical leads (11,12) arranged between the connection contacts (9,10) and the carbon brushes (6,7). The electrical leads (11,12) have a sheath made of polytetrafluoroethylene (20,21).

Title of Invention

DEVICE FOR CONNECTING AN ELECTRIC MOTOR INTENDED FOR USE IN A FUEL TANK, IN PARTICULAR OF A MOTOR VEHICLE

Abstract

The subject matter of the invention is a device (8) for connecting an electric motor (1) intended for use in a fuel tank in particular of a motor vehicle, with connection contacts (9, 10), with carbon brushes (6,7) sliding over an armature (5) of a rotor (3), and with electrical leads (11,12) arranged between the connection contacts (9,10) and the carbon brushes (6,7). The electrical leads (11,12) have a sheath made of polytetrafluoroethylene (20,21).

Full Text	Description Device for connecting an electric motor intended for use in a fuel tank, in particular of a motor vehicle The invention relates to a device for connecting an electric motor intended for use in a fuel tank, in particular of a motor vehicle, having connection contacts, having carbon brushes which slide over an armature of a rotor, and having electrical leads arranged between the connection contacts and the carbon brushes. Devices of this kind are usually produced as a unit together with the carbon brushes and are known in practice. In this case, the electric motor used in the fuel tank serves to drive a fuel pump. In the device known from practice, the connection contacts are mounted on a plastic part. The electric motor can be connected to a power supply system of the motor vehicle via the connection contacts. In addition, an interference- suppression part which has one capacitor and two interference- suppression inductors is usually arranged in the plastic part. The plastic part is connected to the electric motor. The subregion of the lead which is routed out of the plastic part is designed as a flexible copper wire and routed as far as the respective carbon brush which is in contact with a collector of the electric motor. One disadvantage of the known device is that the electrical lead is corroded and subsequently destroyed in aggressive media, for example fuel. DE 199 21 540 Al discloses extrusion coating the region of the connecting point of an electrical lead to a contact element with a fuel-resistant plastic. The fuel-resistant plastics mentioned are POM and PPS. It has been found here that extrusion coating with POM or PPS leads to a high degree of rigidity of the electrical lead. Due to wear of the carbon brushes, they have to be adjusted in order to remain in contact with the collector. Permanent contact between the carbon brushes which are subject to wear and the collector is no longer ensured due to the high degree of rigidity of the electrical lead. The invention is based on the object of providing a device of the abovementioned type which firstly is effectively protected against attacks by aggressive media and secondly ensures permanent contact between the carbon brushes and the collector of the electric motor. According to the invention, the object is achieved in that the electrical leads have a sheath comprising polytetrafluoroethylene. The very high degree of fuel resistance and the low tendency to swell of polytetrafluoroethylene (PTFE) allows a sheath of electrical leads to be designed with a low wall thickness. On account of the low wall thickness of the sheath, electrical leads of this type have a very high degree of flexibility. Consequently, the electrical lead is sufficiently mobile to follow adjustment movements of the carbon brushes as a result of wear. This therefore ensures that the carbon brushes are in permanent contact with the collector of the electric motor over the entire service life. In an advantageous refinement, sheaths with a wall thickness of only 0.1 mm can be produced, as a result of which the electrical leads are provided with a particularly high degree of flexibility. In a further advantageous refinement of the invention, in which the electrical component is arranged in a housing and the electrical leads are routed out of the housing, the sheath of the cable wire simultaneously serves as a seal between the electrical leads and the housing. The invention will be explained in greater detail using an exemplary embodiment. In the associated drawing fig. 1 schematically shows a longitudinal section through an electric motor having a device according to the invention, and fig. 2 shows a greatly enlarged illustration of the device according to the invention. Figure 1 shows an electric motor I having a rotor 3, which is rotatably mounted in a housing 2, and having a stator 4. In order to be supplied with electric power, the rotor 3 has an armature 5 over which carbon brushes 6, 7 slide. Electric power is supplied to the armature 5 via a device 8 having connection contacts 9, 10 and having electrical leads 11, 12 between which an interference-suppression part 13 is arranged. The electrical leads 11, 12 are conducted to the carbon brushes 6, 7. Plug- type contacts (not illustrated) of a power supply system can be connected to the connection contacts 9, 10. This electric motor 1 is intended to drive a fuel pump of a motor vehicle, and fuel flows through said electric motor. Figure 2 shows the device 8 from figure 1 on a greatly enlarged scale. The device 8 has a plastic part 14 for holding the connection contacts 9, 10 and in each case an inductor 15, 16 arranged between the connection contacts 9, 10 and electrical leads 11, 12. The connection contacts 9, 10 are jointly connected to a capacitor 17. The inductors 15, 16 and the capacitor 17 form the interference-suppression part 13. The electrical leads 11, 12 connect the electric motor 1 (illustrated in figure 1) to the poles of a power supply system. The two electrical leads 11, 12 comprise copper wires 18, 19 which are extrusion coated with PTFE 20, 21. For the purposes of improved illustration, the electrical leads 11, 12 are illustrated on an enlarged scale. Despite being extrusion coated with PTFE 20, 21, the electrical leads are so flexible that they move at the same time as the carbon brushes 6, 7 wear away, and reliably ensure power is supplied to the electric motor 1 which is illustrated in figure 1. Claims 1. A device for connecting an electric motor intended for use in a fuel tank, in particular of a motor vehicle, having connection contacts, having carbon brushes which slide over an armature of a rotor, and having electrical leads arranged between the connection contacts and the carbon brushes, characterized in that the electrical leads (11, 12) have a sheath comprising polytetrafluoroethylene (20, 21) . 2. The device as claimed in claim 1, characterized in that the sheath (20, 21) has a wall thickness of at least 0.1 mm. The subject matter of the invention is a device (8) for connecting an electric motor (1) intended for use in a fuel tank in particular of a motor vehicle, with connection contacts (9, 10), with carbon brushes (6,7) sliding over an armature (5) of a rotor (3), and with electrical leads (11,12) arranged between the connection contacts (9,10) and the carbon brushes (6,7). The electrical leads (11,12) have a sheath made of polytetrafluoroethylene (20,21).

Full Text

Description
Device for connecting an electric motor intended for use in a
fuel tank, in particular of a motor vehicle
The invention relates to a device for connecting an electric
motor intended for use in a fuel tank, in particular of a motor
vehicle, having connection contacts, having carbon brushes
which slide over an armature of a rotor, and having electrical
leads arranged between the connection contacts and the carbon
brushes.
Devices of this kind are usually produced as a unit together
with the carbon brushes and are known in practice. In this
case, the electric motor used in the fuel tank serves to drive
a fuel pump. In the device known from practice, the connection
contacts are mounted on a plastic part. The electric motor can
be connected to a power supply system of the motor vehicle via
the connection contacts. In addition, an interference-
suppression part which has one capacitor and two interference-
suppression inductors is usually arranged in the plastic part.
The plastic part is connected to the electric motor. The
subregion of the lead which is routed out of the plastic part
is designed as a flexible copper wire and routed as far as the
respective carbon brush which is in contact with a collector of
the electric motor. One disadvantage of the known device is
that the electrical lead is corroded and subsequently destroyed
in aggressive media, for example fuel.
DE 199 21 540 Al discloses extrusion coating the region of the
connecting point of an electrical lead to a contact element
with a fuel-resistant plastic. The fuel-resistant plastics
mentioned are POM and PPS. It has been found here that
extrusion coating with POM or PPS leads to a high degree of
rigidity of the

electrical lead. Due to wear of the carbon brushes, they have
to be adjusted in order to remain in contact with the
collector. Permanent contact between the carbon brushes which
are subject to wear and the collector is no longer ensured due
to the high degree of rigidity of the electrical lead.
The invention is based on the object of providing a device of
the abovementioned type which firstly is effectively protected
against attacks by aggressive media and secondly ensures
permanent contact between the carbon brushes and the collector
of the electric motor.
According to the invention, the object is achieved in that the
electrical leads have a sheath comprising
polytetrafluoroethylene.
The very high degree of fuel resistance and the low tendency to
swell of polytetrafluoroethylene (PTFE) allows a sheath of
electrical leads to be designed with a low wall thickness. On
account of the low wall thickness of the sheath, electrical
leads of this type have a very high degree of flexibility.
Consequently, the electrical lead is sufficiently mobile to
follow adjustment movements of the carbon brushes as a result
of wear. This therefore ensures that the carbon brushes are in
permanent contact with the collector of the electric motor over
the entire service life.
In an advantageous refinement, sheaths with a wall thickness of
only 0.1 mm can be produced, as a result of which the
electrical leads are provided with a particularly high degree
of flexibility.
In a further advantageous refinement of the invention, in which
the electrical component is arranged in a housing and the
electrical leads are routed out of the housing, the sheath of

the cable wire simultaneously serves as a seal between the
electrical leads and the housing.

The invention will be explained in greater detail using an
exemplary embodiment. In the associated drawing
fig. 1 schematically shows a longitudinal section through an
electric motor having a device according to the
invention, and
fig. 2 shows a greatly enlarged illustration of the device
according to the invention.
Figure 1 shows an electric motor I having a rotor 3, which is
rotatably mounted in a housing 2, and having a stator 4. In
order to be supplied with electric power, the rotor 3 has an
armature 5 over which carbon brushes 6, 7 slide. Electric power
is supplied to the armature 5 via a device 8 having connection
contacts 9, 10 and having electrical leads 11, 12 between which
an interference-suppression part 13 is arranged. The electrical
leads 11, 12 are conducted to the carbon brushes 6, 7. Plug-
type contacts (not illustrated) of a power supply system can be
connected to the connection contacts 9, 10. This electric motor
1 is intended to drive a fuel pump of a motor vehicle, and fuel
flows through said electric motor.
Figure 2 shows the device 8 from figure 1 on a greatly enlarged
scale. The device 8 has a plastic part 14 for holding the
connection contacts 9, 10 and in each case an inductor 15, 16
arranged between the connection contacts 9, 10 and electrical
leads 11, 12. The connection contacts 9, 10 are jointly
connected to a capacitor 17. The inductors 15, 16 and the
capacitor 17 form the interference-suppression part 13. The
electrical leads 11, 12 connect the electric motor 1
(illustrated in figure 1) to the poles of a power supply
system. The two electrical leads 11, 12 comprise copper wires
18, 19 which are extrusion coated with PTFE 20, 21. For the
purposes of improved illustration, the electrical leads 11, 12
are illustrated on an enlarged scale. Despite being extrusion

coated with PTFE 20, 21, the electrical leads are so flexible
that they move at the same time

as the carbon brushes 6, 7 wear away, and reliably ensure power
is supplied to the electric motor 1 which is illustrated in
figure 1.

Claims
1. A device for connecting an electric motor intended for use
in a fuel tank, in particular of a motor vehicle, having
connection contacts, having carbon brushes which slide over an
armature of a rotor, and having electrical leads arranged
between the connection contacts and the carbon brushes,
characterized in that the electrical leads (11, 12) have a
sheath comprising polytetrafluoroethylene (20, 21) .
2. The device as claimed in claim 1, characterized in that
the sheath (20, 21) has a wall thickness of at least 0.1 mm.

The subject matter of the invention is a device (8)
for connecting an electric motor (1) intended for use in a fuel tank
in particular of a motor vehicle, with connection contacts
(9, 10), with carbon brushes (6,7) sliding
over an armature (5) of a rotor (3),
and with electrical leads (11,12) arranged between
the connection contacts (9,10) and the carbon brushes (6,7).
The electrical leads (11,12) have a sheath made of
polytetrafluoroethylene (20,21).

Documents:

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Patent Number

268932

Indian Patent Application Number

107/KOLNP/2009

PG Journal Number

40/2015

Publication Date

02-Oct-2015

Grant Date

23-Sep-2015

Date of Filing

09-Jan-2009

Name of Patentee

CONTINENTAL AUTOMOTIVE GMBH

Applicant Address

VAHRENWALDER STRASSE 9, 30165 HANNOVER

Inventors:

#	Inventor's Name	Inventor's Address
1	WOLFGANG WARNKE	EISFELD 7 37293 HERLESHAUSEN
2	RALF MUEHLHAUSEN	NORDSTRASSE 2 36199 ROTENBURG

PCT International Classification Number

H01R 39/36

PCT International Application Number

PCT/EP2007/057307

PCT International Filing date

2007-07-16

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	102006033231.8	2006-07-18	Germany