HYBRID MODULE HAVING MANAGEMENT OF WEAR DEBRIS FOR A DRY FRICTION CLUTCH

Abstract

A hybrid module for a drive train of a motor vehicle includes an electrical machine, a dry friction clutch for coupling the electrical machine with the drive train, an input shaft arranged to be coupled to an internal combustion engine of the motor vehicle, and an output shaft arranged to be coupled to a vehicle transmission of the motor vehicle. The dry friction clutch is designed to lead away or secure wear debris of the dry friction clutch. The hybrid module may be arranged as a P2 hybrid module within the drive train between an internal combustion engine side of the motor vehicle and a vehicle transmission side of the motor vehicle. The dry friction clutch may be a dry multi-disk clutch.

Claims

1.-10. (canceled)

11. A hybrid module for a drive train of a motor vehicle comprising: an electrical machine; a dry friction clutch for coupling the electrical machine with the drive train, the dry friction clutch comprising an axis of rotation; an input shaft arranged to be coupled to an internal combustion engine of the motor vehicle; and an output shaft arranged to be coupled to a vehicle transmission of the motor vehicle, wherein the dry friction clutch is designed to lead away or secure wear debris of the dry friction clutch.

12. The hybrid module of claim 11 wherein the hybrid module can be arranged as a P2 hybrid module within the drive train between: an internal combustion engine side of the motor vehicle, directed towards the internal combustion engine; and a vehicle transmission side of the motor vehicle, directed towards the vehicle transmission.

13. The hybrid module of claim 11 wherein the dry friction clutch is a dry multi-disk clutch.

14. The hybrid module of claim 11 wherein the dry friction clutch comprises a wear debris reservoir for receiving wear debris.

15. The hybrid module of claim 14 wherein: the dry friction clutch comprises a plurality of outer disks; and the wear debris reservoir is disposed between two of the plurality of outer disks.

16. The hybrid module of claim 14 wherein: the dry friction clutch comprises an outer disk carrier; and the wear debris reservoir is arranged radially inward on the outer disk carrier.

17. The hybrid module of claim 14 wherein: the dry friction clutch comprises an outer disk carrier; and the wear debris reservoir is arranged to extend axially to a vehicle transmission side, directed towards the vehicle transmission, on the outer disk carrier.

18. The hybrid module of claim 11 wherein the dry friction clutch comprises an outer channel to lead away or secure the wear debris.

19. The hybrid module of claim 18 wherein: the dry friction clutch comprises an outer disk carrier; the outer channel penetrates the outer disk carrier substantially radially; and the hybrid module further comprises a wear debris control system to protect the electrical machine from the wear debris.

20. The hybrid module of claim 19 wherein the wear debris control system is arranged radially on an outside of the outer channel at least partially axially between the outer channel and the electrical machine.

21. The hybrid module of claim 19 wherein: the hybrid module comprises module housing; and the wear debris control system is fixed to the module housing.

22. The hybrid module of claim 21 wherein: the hybrid module further comprises an end shield; the wear debris control system is fixed to the end shield; and the end shield comprises a passage arranged such that, in an operating state of the dry friction clutch, the wear debris can be led away or secured through the outer channel and then through the passage.

23. The hybrid module of claim 11 wherein: the hybrid module further comprises a rotationally fixed end shield; and the end shield comprises a wear debris reservoir for receiving the wear debris.

24. The hybrid module of claim 11 wherein the dry friction clutch comprises an inner disk carrier with an inner channel.

25. The hybrid module of claim 24 wherein the inner channel penetrates the inner disk carrier in an essentially radial manner.

26. The hybrid module of claim 24 further comprising an axially acting paddle wheel geometry disposed on a radial inside of the inner disk carrier.

27. The hybrid module of claim 24 further comprising a radially acting paddle wheel geometry disposed on a radial inside of the inner disk carrier.

28. The hybrid module of claim 11 further comprising a module housing, wherein the electrical machine and the dry friction clutch are arranged in the module housing.

29. The hybrid module of claim 28 further comprising a damper unit arranged in the module housing.

30. The hybrid module of claim 29 wherein the damper unit is arranged within the drive train between an internal combustion engine connection and the dry friction clutch.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In the following, the disclosure is explained by way of example with reference to the accompanying drawings using exemplary embodiments. The features shown below can represent an aspect of the disclosure both individually and in combination. In the figures:

[0051] FIG. 1 shows a first embodiment of a hybrid module according to the disclosure;

[0052] FIG. 2 shows a second embodiment of a hybrid module according to the disclosure;

[0053] FIG. 3 shows a third embodiment of a hybrid module according to the disclosure;

[0054] FIG. 4 shows a fourth embodiment of a hybrid module according to the disclosure;

[0055] FIG. 5 shows a fifth embodiment of a hybrid module according to the disclosure;

[0056] FIG. 6 shows a sixth embodiment of a hybrid module according to the disclosure; and

[0057] FIG. 7 shows a seventh embodiment of a hybrid module according to the disclosure.

DETAILED DESCRIPTION

[0058] FIG. 1 shows an exemplary embodiment of a dry friction clutch 16 according to the disclosure. The dry friction clutch 16 is designed as a dry multi-disk clutch and includes, among other things, a plurality of outer disks 16a, which are designed as steel disks, for example, and a corresponding plurality of inner disks 16b, which are designed, for example, as lining disks. The multi-disk clutch has an axial axis, corresponding to an axis of rotation D of the friction clutch 16, and a radial axis which extends transversely to the axis of rotation D. The outer disks 16a are suspended on the outside in the radial direction and are displaceable in the axial direction. The inner disks 16b are suspended on the inside in the radial direction and are displaceable in the axial direction. By shifting the inner disks 16b and the outer disks 16a relative to each other in the axial direction, inner disks 16b and outer disks 16a adjacent in the axial direction can be brought into frictional engagement with one another, so that torque can be transmitted from the inner disks 16b to the outer disks 16a and vice versa.

[0059] The multi-disk clutch also has a driving ring as an inner disk carrier 34, on which the inner disks 16b are suspended in a torque-transmitting manner. The outer disks 16a are suspended from a rotor pot as an outer disk carrier 24. In operation, in the engaged state of the multi-disk clutch, torque can be transmitted between the driving ring via the inner disks 16b and the outer disks 16a to the rotor pot and vice versa, depending on whether a pulling operation or pushing operation is present.

[0060] The arrangement of steel and lining disks can in principle take place in both directions, inside and outside. In principle, a separate toothing ring can also be attached to both types of disks. Here, as an example, only an embodiment of an inside friction disk having a toothing ring in combination with an outside steel disk without an additional toothing ring is disclosed.

[0061] The torque introduced by the rotor via the outer disk carrier 24 is introduced into the steel disk via an annular carrier plate. This carrier plate has a toothing on the outer diameter, which is in contact with the outer disk carrier 24. Furthermore, the carrier plate contains spring elements that enable an axial path between the steel disk and the outer disk carrier. Since the rigidity of the outer leaf spring elements is to be kept as low as possible, there is no longer any relative movement/sliding friction in the toothing even at a low torque.

[0062] The lining disk transfers the torque from the steel disk to the inner disk carrier 34. This also takes place between the friction lining and the inner disk carrier via an annular carrier plate. Depending on the surface pressure, the toothing can either be integrated directly into the carrier plate or, in the case of high coupling torques, into an additional toothing ring. This is then riveted to the carrier plate. The inner carrier plate also contains spring elements which enable an axial path between the lining disk and the inner disk carrier 34. The functional principle is the same on the outside.

[0063] The friction clutch 16 is provided in particular for a hybrid module 10. The basic idea of the hybrid module 10 is the wear debris management from the friction clutch 16. A hybrid module 10 is therefore basically provided, in particular for a drive train of a motor vehicle, which hybrid module 10 can be arranged as a P2 hybrid module within the drive train between an internal combustion engine side B of the motor vehicle, directed toward an internal combustion engine, and a vehicle transmission side F of the motor vehicle, directed toward a vehicle transmission 12. The hybrid module has at least one electrical machine 14; at least one dry friction clutch 16 with an axis of rotation D, the friction clutch 16 having a dry multi-disk clutch, for example; an input shaft 18, which can be coupled to the internal combustion engine of the motor vehicle; and an output shaft 20, which can be coupled to the vehicle transmission 12 of the motor vehicle. The at least one electrical machine 14 and the at least one friction clutch 16 cooperate in such a way that the electrical machine 14 can be coupled into and/or uncoupled from the drive train of the motor vehicle by means of the friction clutch 16 and the at least one friction clutch 16 is designed to lead away and/or secure wear debris of the at least one friction clutch 16.

[0064] The leading away or the securing of wear debris present in the dry friction clutch 16 can, as shown in FIGS. 1 to 7, take place in different ways. The exemplary embodiments in FIGS. 1 to 7 are exemplary embodiments that are independent of one another. Purely by way of example and not by way of limitation, the friction clutch 16 is shown in all embodiments as a multi-disk clutch and the electrical machine 14 as an electric motor.

[0065] In the exemplary embodiment shown in FIG. 1, the wear debris produced is held within the immediate clutch region, in the present example in the form of a multi-disk clutch, namely in wear debris reservoirs 22, as the reservoir region. Under centrifugal force, the wear debris is deposited in the best possible radial position, which is encapsulated outward, within the clutch region, and remains there. The lateral boundaries, or axial boundaries, of the coupling region protrude sufficiently far inward in the radial direction to prevent the wear debris from escaping laterally. Sufficient free regions outside of the immediate functional regions, for example the leaf spring working region, are present within the clutch region to store the entire wear debris that occurs over the service life without disruption, namely in the reservoir region. In particular, according to FIG. 1 it is thus provided that the at least one friction clutch 16 has one or more wear debris reservoirs 22 for receiving wear debris, between a plurality of outer disks 16a, and the plurality of wear debris reservoirs 22 are arranged radially inward on an outer disk carrier 24 of the friction clutch 16.

[0066] In the exemplary embodiment shown in FIG. 2, different from or in addition to FIG. 1, the radially outer delimitation of the immediate coupling region is not completely encapsulated, but is provided with outer channels 26 leading radially outward. Furthermore, between the region radially outside of the described outer channels 26 and that of the electrical machine 14, designed as an electric motor, there is a wear debris control system 28, designed as a baffle plate, to protect the electric motor from wear debris. This can be fixed to the gearbox or designed to rotate with the rotor of the electric motor. The wear debris leaves the immediate clutch region radially outward under centrifugal force and remains on the left, with reference to FIG. 2, i.e., on the side of the baffle plate facing away from the transmission. The side facing away from the transmission is the internal combustion engine side B. In particular, according to FIG. 2, it is thus provided that the friction clutch 16 has one or more outer channels 26 to lead away and/or secure wear debris of the friction clutch 16. The one or more outer channels 26 may penetrate an outer disk carrier 24 of the friction clutch 16 in an essentially radial manner. In this case, a wear debris control system 28 to protect the electrical machine 14 from wear debris may be arranged radially on the outside of the one or more outer channels 26, at least partially axially between the one or more outer channels 26 and the electrical machine 14.

[0067] In the exemplary embodiment shown in FIG. 3, different from or in addition to FIG. 2, a wear debris control system 28, formed as a baffle plate fixed to the transmission housing, is designed in such a way that the wear debris is directed under the influence of the centrifugal force acting thereon in the direction of passages 32 in a bearing support, or end shield, 30 formed as a partition wall. The wear debris passes through the passages 32 into the radially outer region on the side of the partition wall facing away from the transmission and remains there. In particular, according to FIG. 3, it is thus provided that the friction clutch 16 has one or more outer channels 26 to lead away and/or secure wear debris of the at least one friction clutch 16, and the one or more outer channels 26 may penetrate an outer disk carrier 24 of the friction clutch 16 substantially radially.

[0068] A wear debris control system 28 to protect the electrical machine 14 from wear debris may be arranged radially on the outside of the one or more outer channels 26, at least partially axially between the one or more outer channels 26 and the electrical machine 14. Furthermore, it is provided according to FIG. 3 that the wear debris control system 28 is arranged to be fixed to the transmission housing on the hybrid module 10, e.g., on an end shield 30 of the hybrid module 10, and the end shield 30 has one or more passages 32 which are arranged in such a way that in an operating state of the friction clutch 16, wear debris can be led away and/or secured through the one or more outer channels 26 and then through the one or more passages 32.

[0069] In the exemplary embodiment shown in FIG. 4, different from or in addition to FIG. 1, regions within the laterally and radially outwardly encapsulated coupling region are designed as a reservoir in such a way that the wear debris collects there. This collecting process may be supported by the leakage from the, in particular hydraulic, actuation system that collects there at the same time under centrifugal force. In particular, according to FIG. 4 it is thus provided that the at least one friction clutch 16 has one or more wear debris reservoirs 22 for receiving wear debris, between a plurality of outer disks 16a, and the plurality of wear debris reservoirs 22 are arranged radially inward on an outer disk carrier 24 of the friction clutch 16. The one or more wear debris reservoirs 22 are arranged, extending axially to the vehicle transmission side F, on an outer disk carrier 24 of the friction clutch 16. It is shown that the outer disk carrier 24 can be designed differently for this purpose than in FIG. 1 to form a larger reservoir.

[0070] In the exemplary embodiment shown in FIG. 5, different from or in addition to FIG. 2, the partition wall is provided with regions that are trap-shaped, that is to say laterally and radially outwardly sufficiently closed, in which the wear debris can collect permanently. In particular, according to FIG. 5, it is thus provided that the friction clutch 16 has one or more outer channels 26 to lead away and/or secure wear debris of the at least one friction clutch 16. The one or more outer channels 26 may penetrate an outer disk carrier 24 of the friction clutch 16 in an essentially radial manner. Optionally, a wear debris control system 28 to protect the electrical machine 14 from wear debris is optionally arranged radially on the outside of the one or more outer channels 26, at least partially axially between the one or more outer channels 26 and the electrical machine 14. The hybrid module 10 may have a rotationally fixed end shield 30 which has one or more wear debris reservoirs 22 for receiving wear debris.

[0071] In the exemplary embodiment shown in FIG. 6, different from or in addition to FIG. 5, the radially outward conveying of the wear debris under centrifugal force is supported by internal, axially acting paddle wheel geometries 38, here in the inner disk carrier 34. For this purpose, in an example arrangement, the inner disk carrier 34 is provided with inner channels 36 in the predominantly cylindrical region. In particular, it is thus provided according to FIG. 6, that the friction clutch 16 has one or more outer channels 26 to lead away and/or secure wear debris of the friction clutch 16, and the one or more outer channels 26 may penetrate an outer disk carrier 24 of the friction clutch 16 in an essentially radial manner. It is provided that the hybrid module 10 has a rotationally fixed end shield 30, which has one or more wear debris reservoirs 22 for receiving wear debris.

[0072] It is optionally provided that the at least one friction clutch 16 has an inner disk carrier 34 with one or more inner channels 36, and the one or more inner channels 36 may penetrate the inner disk carrier 34 in an essentially radial manner. It is also optionally provided that the hybrid module 10 has an axially acting paddle wheel geometry 38 radially on the inside of the inner disk carrier 34.

[0073] In the exemplary embodiment shown in FIG. 7, different from or in addition to FIG. 6, the centrifugal force radially outward conveying of the wear debris is supported by internal, radially acting paddle wheel geometries, in the present case in the internal cylindrical region of the inner disk carrier. In particular, it is thus provided according to FIG. 7, that the friction clutch 16 has one or more outer channels 26 to lead away and/or secure wear debris of the friction clutch 16, and the one or more outer channels 26 may penetrate an outer disk carrier 24 of the friction clutch 16 in an essentially radial manner. It is provided that the hybrid module 10 has a rotationally fixed end shield 30, which has one or more wear debris reservoirs 22 for receiving wear debris.

[0074] It is optionally provided that the at least one friction clutch 16 has an inner disk carrier 34 with one or more inner channels 36, and the one or more inner channels 36 may penetrate the inner disk carrier 34 in an essentially radial manner. It is also optionally provided that the hybrid module 10 has a radially acting paddle wheel geometry 38 radially on the inside of the inner disk carrier 34.

[0075] Also shown in FIG. 7 is a radially outer clutch bell housing 44. This clutch bell housing 44 can be part of the end shield 30 or can be arranged in some other way on the hybrid module 10. The clutch bell housing 44 is not limited to the embodiment of FIG. 7, but forms a separate feature. Thus, the clutch bell housing 44 can also be used in other embodiments, for example according to FIGS. 1 to 6. The clutch bell housing 44 may form a wear debris reservoir 22.

[0076] In principle, it is possible in all exemplary embodiments that the hybrid module 10 has a hybrid module housing and at least one damper unit 40, for example. At least the at least one electrical machine 14, the at least one friction clutch 16, e.g., as a multi-disk clutch, and the at least one damper unit 40, for example, are arranged in the hybrid module housing. The at least one damper unit 40 may be arranged within the drive train between an internal combustion engine connection 42 and the friction clutch 16.

[0077] The disclosed device is intended for use with dry friction clutches 16 or disconnect clutches, especially K0 modules in P2 arrangements. The strategies shown can, however, be transferred directly to other applications, e.g., with hybridized drive trains. Particular mention should be made of triple clutches and K1 modules for dedicated hybrid transmissions.

[0078] In a hybrid drive train, in particular of a motor vehicle, an internal combustion engine is connected via a crankshaft to the friction clutch 16 designed as a multi-disk clutch, which is designed as a K0 or disconnect clutch for disconnecting and connecting the internal combustion engine from the hybrid drive train. The multi-disk clutch is designed concentrically with an electrical machine 14. Torque can be transmitted to the Wheels of the motor vehicle via an output shaft 20. The output shaft 20 can thus be connected to the multi-disk clutch and the electrical machine 14. The multi-disk clutch is integrated, in particular, into a rotor of the electrical machine 14. The electrical machine 14 may be an electric motor and/or an electric generator.

REFERENCE NUMERALS

[0079] 10 Hybrid module [0080] 12 Vehicle transmission [0081] 14 Electrical machine [0082] 16 Friction clutch [0083] 16a Outer disks [0084] 16b Inner disks [0085] 18 Input shaft [0086] 20 Output shaft [0087] 22 Wear debris reservoir [0088] 24 Outer disk carrier [0089] 26 Outer channel [0090] 28 Wear debris control system [0091] 30 End shield [0092] 32 Passage [0093] 34 Inner disk carrier [0094] 36 Inner channel [0095] 38 Paddle wheel geometry [0096] 40 Damper unit [0097] 42 Internal combustion engine connection [0098] 44 Clutch bell housing [0099] B Internal combustion engine side [0100] F Vehicle transmission side [0101] D Axis of rotation