Normal close type clutch module

Abstract

To further improve a torque transmission system.SOLUTION: A clutch module comprises: a piston (20) configured to clamp a friction disc when the clutch module is in an engagement position and to release the friction disc when the clutch module is in an engagement release position; an elastic device configured to exert elastic return force on the piston (20) to hold the piston (20) in the engagement position; and a piston actuation system (40) for actuating the piston (20), the piston actuation system (40) axially abutting against the piston (20) on one hand and against an output disc carrier on the other hand, preferably via a rolling bearing, and being configured to move the piston (20) from the engagement position to the engagement release position against the elastic return force of the elastic device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The field of the invention is clutch modules of the normally closed type, in particular for motor vehicles. [Background technology]

[0002] A transmission system is known which is arranged between a transmission and a combustion engine, the transmission system including an electric motor and a clutch on the engine side, so that the crankshaft of the combustion engine can be rotationally coupled to the rotor of the electric motor. This allows the combustion engine to be stopped whenever the vehicle is stopped and to be restarted using the electric motor. The electric motor may also constitute an electric brake or may increase the power of the combustion engine to assist the combustion engine or to prevent stalling. The electric motor may also drive the vehicle. When the combustion engine is in operation, the electric motor acts as an alternator. The actuation system has rest and operating states for controlling the clutch between a position in which the combustion engine is engaged, called an "engaged position", and a position in which the combustion engine is disengaged, called a "disengaged position". If the operating state of the actuation system corresponds to the engaged position, the clutch is called normally open type. If the operating state of the actuation system corresponds to the disengaged position, the clutch is called normally closed type. Such a transmission assembly is notably disclosed in patent application EP 3 532 324. In this patent application, the clutch is of the "normally open" type. Summary of the Invention

[0003] The present invention is particularly aimed at further improving torque transmission systems.

[0004] The subject of the present invention is therefore a normally closed type clutch module having a first rotating shaft, an output disk carrier rotatable about the first rotation shaft; at least one friction disc; a piston configured to clamp the friction discs when the clutch module is in an engaged position and to release the friction discs when the clutch module is in a disengaged position; a resilient device configured to exert a resilient return force on the piston to retain the piston in the engaged position; A piston actuating system for actuating the piston, the clutch module being configured to axially abut against the piston on the one hand and against the output disc carrier on the other hand, preferably via a rolling bearing, and to move the piston from the engaged position to the disengaged position against the elastic return force of the elastic device.

[0005] According to the invention, due to the fact that the piston actuating system abuts axially against the piston on the one hand and against the output disc carrier on the other hand, during actuation of the piston, it is possible to create a load path through the actuating system, the piston and the output disc carrier, which advantageously does not pass through the casing surrounding the clutch module.

[0006] This load path is internal to the clutch module in the sense that the clutch module is self-sufficient or nearly self-sufficient to enable the clutch module to operate. In other words, the clutch module can be operated, for example for testing / inspection, without the need to place the clutch module in the final environment. This is possible due to the fact that the load path is internal to the module (it does not have to rely on components that are external to the clutch module). Another advantage is that the clutch module can be manufactured in a factory, transported in a practical manner, and then assembled to other components, such as an input module with a damper. The "normally closed" type clutch module also has the following advantages: The invention is energy-saving, since the actuation system does not need to be permanently activated to transmit torque from the combustion engine, which is what the vehicle is used for the majority of the time.

[0007] Preferably, the resilient device abuts axially against the output disc carrier.

[0008] Advantageously, the piston actuation system bears axially against the output disc carrier via a rolling bearing, in particular the disc carrier rotates at engine speed and the actuation system is stationary.

[0009] Advantageously, the clutch module is configured to be assembled in a torque transmission system, in particular for a motor vehicle, the torque transmission system further comprising an input module cooperating with the clutch module, the input module being upstream (in the torque transmission direction) of the clutch module.

[0010] According to one aspect of the invention, a clutch module includes a multi-disk assembly between an input disk carrier and an output disk carrier.

[0011] According to one aspect of the invention, when assembled to the input module, the clutch module is located radially inside an outer periphery that passes through an elastic member of a damper of the input module.

[0012] According to one aspect of the invention, the clutch module includes a transfer ring configured for rotational cooperation with a rotor shaft of a rotating electric machine, and optionally a speed reducer assembly interposed between the transfer ring and the rotor shaft of the rotating electric machine, the speed reducer assembly being configured to enable multiple gear ratios.

[0013] In particular, a transfer ring connected to an output disc carrier advantageously meshes, via a reduction gear assembly, with a gear wheel connected to said rotor shaft of said rotating electrical machine.

[0014] According to one aspect of the invention, the transfer ring axially faces the elastic member of the damper.

[0015] "Axial facing" means that the transmission ring and the elastic member of the damper are located on the same geometric cylinder (imaginary curve) centered on the first rotational axis of the clutch module 1 and are offset from each other parallel to this first rotational axis.

[0016] According to one aspect of the invention, the transfer ring has teeth.

[0017] According to one aspect of the present invention, the transfer ring, multi-disk assembly, and actuation system are radially stacked.

[0018] In other words, the transfer ring, the multi-disc assembly, and the piston actuation system are substantially in the same plane perpendicular to the first axis of rotation of the clutch module.

[0019] Alternatively, the transfer ring may be axially offset relative to the multi-disk assembly and piston actuation system while still having a larger diameter relative to the multi-disk assembly and piston actuation system.

[0020] According to one aspect of the invention, the piston cooperates with a rolling shaft attached to the actuation system to cause the actuation system to cooperate with the piston while the piston is free to rotate about the first axis of rotation relative to the actuation system.

[0021] According to one aspect of the invention, the piston comprises at least one actuating finger passing axially through the resilient device.

[0022] According to one aspect of the invention, the resilient device comprises at least one resilient washer, in particular a Belleville spring washer.

[0023] According to one aspect of the invention, the resilient device comprises at least one wavy washer.

[0024] According to one aspect of the invention, the resilient device comprises a plurality of helical springs connected to each other directly or indirectly at their ends.

[0025] According to one aspect of the invention, the piston has an outer periphery extending in the axial direction and pressing against the friction disc, the outer periphery passing axially through the elastic device, which can improve radial compactness.

[0026] According to one aspect of the invention, the actuation system abuts a side of the piston, the side facing the input module.

[0027] According to one aspect of the invention, the actuation system is configured to axially move the piston from an engaged position to a disengaged position. The actuation system can be mechanical, electromechanical, electromagnetic, or hydraulic.

[0028] According to one aspect of the invention, the actuation system is a ball guideway system.

[0029] As a variant, the actuation system is of the hydraulic CSC "concentric driven cylinder" type.

[0030] In particular, the piston actuation system is formed by a hydraulic actuation system known as a concentric slave cylinder (CSC) system, comprising a fixed chamber containing hydraulic fluid, which is connected to a fixed part of the actuation system, and a movable part which translates axially under the action of pressurized hydraulic fluid, which movable part is connected via a rolling bearing to a piston of the clutch module.

[0031] Such hydraulic actuation systems may be incorporated in a similar manner into systems using ball guideways.

[0032] According to one aspect of the invention, an axial bearing, in particular formed by an axial needle thrust bearing or a plain axial bearing, is interposed between the piston actuation system and the output disc carrier.

[0033] According to one aspect of the invention, the piston comprises an axial part which passes through an axial opening of the resilient device.

[0034] According to one aspect of the invention, the piston further comprises an axial component that passes through an axial opening in the output disc carrier.

[0035] According to one aspect of the invention, the clutch module is of the wet clutch type, which operates submerged in a transmission fluid such as oil.

[0036] The present invention further relates to a torque transmission system, in particular for a motor vehicle, comprising the above-mentioned clutch module and an input module assembled thereto, the input module being upstream (in the direction of torque transmission) of the clutch module.

[0037] According to one aspect of the invention, the input module includes an input disk carrier positioned opposite the output disk carrier.

[0038] According to one aspect of the invention, the input module includes a damper and an input disc carrier arranged axially and / or radially facing the output disc carrier of the clutch module and connected to the output portion of the damper.

[0039] In a known manner, a damper is used to filter torsional vibrations (or non-periodicities) of a combustion engine, regardless of whether the clutch module is engaged / disengaged or not.

[0040] According to one aspect of the invention, the input disk carrier and the output disk carrier have mutually facing radial zones, and an axial bearing, in particular formed by an axial thrust needle bearing or a plain axial bearing, is interposed between these mutually facing radial zones.

[0041] According to one aspect of the invention, the axial bearing, the rolling bearing mounted in the actuation system, and the actuation system are axially stacked (i.e., on a geometric line parallel to the first axis of rotation) and are at substantially the same radial distance from the first axis of rotation of the clutch module.

[0042] According to one aspect of the invention, the clutch module and the shock absorber module are disposed within an enclosure formed by a casing 70 .

[0043] According to one aspect of the invention, a transmission fluid is contained in the bottom of the casing, and the clutch module is immersed in the transmission fluid.

[0044] According to one aspect of the invention, the clutch module is mounted to the input module via a connection (particularly using rivets or welding) between the input disc carrier and the output web of the damper.

[0045] The torque transmission system is particularly intended for hybrid vehicles comprising a combustion engine and a rotating electric machine, the clutch module being intended to couple / decouple the combustion engine to the transmission line of the vehicle.

[0046] Other characteristics, details and advantages of the invention will become more clearly apparent on reading the following description and on examining several exemplary embodiments thereof, given in a non-limiting manner with reference to the attached schematic drawings, in which: [Brief description of the drawings]

[0047] [Figure 1] 1 is a cross-sectional view of a torque transmission system according to one embodiment of the present invention; [Diagram 2] FIG. 2 is a detailed diagram of the system of FIG. 1. [Diagram 3] 1 is a cross-sectional view of a torque transmission system according to another embodiment that does not form part of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] The features, variants and various embodiments of the invention may be combined with each other in various combinations, unless they are mutually incompatible or exclusive. In particular, variants of the invention comprising only a selection of the features described below may be envisaged, where this selection of features provides a technical advantage and / or is sufficient to distinguish the invention from the prior art.

[0049] FIG. 1 illustrates a cross-section of a torque transmission system 100 according to one embodiment of the present invention.

[0050] The torque transfer system 100 forms part of the driveline of a vehicle transmission.

[0051] The driveline includes an electric motor 200 having a stator and a rotor.

[0052] The vehicle may be powered by a combustion engine or an electric motor 200, as appropriate.

[0053] The torque transmission device 100 comprises a damper 300 having a damper input element 301 rotatable about a first axis of rotation X. The damper 300 forms an input module 350 in the sense of the present invention. In a known manner, the damper 300 is used to filter torsional vibrations (or non-periodicities) of the combustion engine, regardless of whether the clutch module 1 is engaged / disengaged or not.

[0054] A washer-type damper input element 301 is rotationally coupled to the crankshaft of the combustion engine in a manner known per se.

[0055] The damper 300 comprises a torque output element 301 which is rotatably connectable to, for example, the input shaft of a transmission.

[0056] The input element 301 is capable of pivoting relative to the output element 310 about a first axis of rotation X.

[0057] The damper 300 includes a plurality of resilient members 304 that act against rotation of the output element 310 relative to the input element 301 .

[0058] In this example, the elastic element 304 is a helical spring.

[0059] On the sides of the springs 304 there are input elements 301 which can move locally between the springs 304 and approach each other so as to define circumferential abutment zones for cooperation with the springs 304. These abutment zones allow torque to be transmitted between the input elements 301 and the springs 304.

[0060] The input element 301 extends centrally by an axially extending portion 307 which cooperates with the output element 310 via a centering needle bearing 308 so as to center the input element 310 relative to the casing 70. In the center, the input element 301 is driven by a crankshaft hub 306 via a spline.

[0061] The torque output element 310 here is an intermediate element arranged between the elastic member 304 and the clutch module 1 for torque transmission.

[0062] The clutch module 1 and the input module 350 are arranged in a housing 71 formed by a casing 70 .

[0063] The bottom of the casing 70 contains a transmission fluid, in particular oil, and the clutch module is immersed in the transmission fluid. The clutch module 1 is therefore of the wet type. The clutch module 1 operates immersed in the transmission fluid, such as oil. In this example, an annular seal ring 98 is provided to seal the casing 70.

[0064] The casing 70 is formed by two assembled half shells 72 .

[0065] The intermediate element 310 comprises a web 311 the radial periphery of which has notches 312 arranged circumferentially between the springs 304 .

[0066] These notches 312 define a circumferential abutment zone for transmitting torque between the spring 304 and the output element 310 .

[0067] The clutch module 1 includes an output disc carrier 3 that is rotationally fixed to an output hub 302 .

[0068] The input module 350 includes an input disc carrier 2 arranged radially opposite the output disc carrier 3 of the clutch module 1 .

[0069] The input disk carrier 2 is fixed to the intermediate element 310 for rotation therewith.

[0070] Thus, the input module 350 comprises a damper 300 and an input disc carrier 2 arranged to face the output disc carrier 3 of the clutch module 1 and connected to the output part of the damper 300 .

[0071] When assembled to the input module 350 , the clutch module 1 is located radially inward of the outer periphery PO that passes through the spring 304 of the damper 300 .

[0072] The clutch module 1 comprises a toothed transfer ring 80 arranged to cooperate with a rotor shaft 210 having a second axis of rotation XM of the rotating electric machine 200. Between the transfer ring 80 and the rotor shaft 210 of the rotating electric machine 200 a speed reducer assembly 220 is arranged. The rotor shaft 210 is rotationally guided relative to the casing 70 by ball bearings 81.

[0073] The reducer assembly 220 may be configured to allow for multiple gear ratios.

[0074] The transfer ring 80 is, for example, welded to the output disc carrier 3 .

[0075] The second rotation axis XM of the electric motor 200 is radially offset with respect to the first rotation axis X of the clutch module 1, these axes being parallel to each other.

[0076] The transfer ring 80 axially faces the elastic element 304 of the damper 300 .

[0077] "Axially facing" means that the transfer ring 80 and the damper elastic member 304 are located on the same geometric cylinder (imaginary curve) centered on the first axis of rotation X of the clutch module 1 and are offset parallel to each other with respect to this first axis of rotation X.

[0078] The clutch module 1 further comprises a multi-disc assembly 5 having a plurality of friction discs 6 rotationally fixed to the input disc carrier 2, a plurality of plates 7 arranged on either side of each friction disc 6 and rotationally fixed to the output disc carrier 3, and friction linings arranged between the plates 7 and the friction discs 6.

[0079] The friction lining may be fixed to the friction disc 6, in particular by gluing or riveting. Two friction linings may be fixed axially on either side of the friction disc.

[0080] In another embodiment, not shown, a single friction lining may be fixed axially to one side of the friction disc.

[0081] In another embodiment, not shown, a single friction lining may be fixed to one axial side of the friction disc and another friction lining may be fixed to one axial side of the plate.

[0082] The clutch module 1 can be in a disengaged position and an engaged position in which the plates 7 and friction discs 6 clamp the friction linings so that torque is transmitted between the input disc carrier 2 and the output disc carrier 3 .

[0083] Of course, many other arrangements of the friction discs 6 and plates 7 are conceivable.

[0084] The output disc carrier 3 supports an axially fixed reaction element 11 against which the multi-disc assembly 5 is clamped in an engaged position. The reaction element 11 is in the form of a continuous annular ring surrounding the first axis of rotation X.

[0085] The plates 7 and the friction discs 6 are radially between a cylindrical skirt 12 of the output disc carrier 3 and a cylindrical skirt 14 of the input disc carrier 2 .

[0086] The clutch module 1 may comprise between 2 and 7 friction discs, for example, 4 friction discs.

[0087] The clutch module 1 also includes a piston 20 configured to clamp the multi-disc assembly 5 when the clutch module 1 is in an engaged position and to release the multi-disc assembly 5 when the clutch module 1 is in a disengaged position. The piston 20 presses against a disc receiving plate 29 that may clamp the multi-disc assembly 5. The disc receiving plate 29 is rotationally connected to the output disc carrier 3 while allowing axial movement.

[0088] The clutch module 1 further includes an elastic device 30 configured to exert an elastic return force on the piston 20 to hold the piston 20 in the engaged position. Such a clutch module 1 is of a type called a normally closed type.

[0089] The clutch module 1 further comprises a piston actuating system 40 for actuating the piston 20, the piston actuating system 40 being configured to abut axially against the piston 20 on the one hand and against the output disc carrier 3 on the other hand and to move the piston 20 from the engaged position to the disengaged position against the elastic return force of the elastic device 30.

[0090] The transfer ring 80, the multi-disc assembly 5 and the piston actuation system 40 are radially stacked.

[0091] In other words, the transfer ring 80 , the multi-disc assembly 5 and the piston actuation system 40 lie substantially in the same plane perpendicular to the first axis of rotation X of the clutch module 1 .

[0092] The input disc carrier 2 and the output disc carrier 3, which operate along the first rotation axis X, respectively comprise mutually facing radial zones 16 and 15. Between these mutually facing radial zones 15, 16, an axial bearing 37 formed by an axial needle thrust bearing or a plain axial bearing is arranged.

[0093] A further axial bearing 38 formed by an axial needle thrust bearing or a plain axial bearing is arranged between the piston actuation system 40 and the radial zone 15 of the power disc carrier 3 .

[0094] The piston 20 cooperates with a rolling bearing 39 mounted in the actuation system 40 such that the actuation system 40 cooperates with the piston 20 while the piston 20 is free to rotate about a first axis of rotation X relative to the actuation system 40.

[0095] The axial bearings 37 and 38, the rolling bearing 39 mounted on the actuation system 40, and the actuation system 40 are arranged axially stacked, i.e. on a geometric line XE parallel to the first axis of rotation X and at substantially the same radial distance from the first axis of rotation X of the clutch module 1.

[0096] The elastic device 30 includes a Belleville type elastic washer 36 that abuts against a circlip 49. The circlip 49 is attached between the end projections 23 of the piston 20. Furthermore, the elastic device 30 abuts against the output disc carrier 3 in the axial direction.

[0097] In the alternative, the resilient device 30 may comprise at least one wavy washer.

[0098] In an alternative embodiment not shown, the resilient device comprises a number of helical springs connected together at their ends, referred to as a "spring pack." In either case, the piston 20 may comprise fingers that pass through the springs to clamp the multi-disk assembly.

[0099] The actuation system 40 abuts against a side 27 of the piston 20 , which side 27 faces the input module 350 .

[0100] The clutch module 1 is attached to the input module 350 via a connection, in particular using rivets, between the input disc carrier 2 and the output web 311 of the damper. Instead of rivets, welding can also be used.

[0101] The actuation system 40 is configured to move the piston 20 axially from an engaged position to a disengaged position. The actuation system 40 may be mechanical, electromechanical, electromagnetic, or hydraulic.

[0102] In the example of FIGS. 1 and 2, the actuation system 40 is formed by a ball guideway system 42 which comprises a first guideway 43 and a second guideway 44 .

[0103] An annulus 45 between the first guideway 43 and the second guideway 44 holds a ball (not shown).

[0104] The first guideway 43 is in the form of a ring which rests against the axial bearing 38. This first guideway 43 is rotationally connected, for example via a spline or via a weld 48, to an actuating lever 47 which is formed by a wheel which, in the case of a ball guideway system, has inner teeth for meshing with the second guideway 44 and outer teeth for meshing directly or indirectly with a pinion protruding from the actuating motor.

[0105] Where a fork-type actuation system, as described below, is used instead of the ball guideway system 42, the actuation lever 47 is formed from a wheel having external teeth for directly or indirectly meshing with the lever of the fork.

[0106] The second guideway 44 takes the form of a toothed ring supporting the rolling bearing 39 .

[0107] The guideways 43 and 44 have a suitable shape so as to allow axial movement of the piston 20 by means of said guideways when rotated relative to one another by an electric motor (not shown), which is connected to an actuating lever 47.

[0108] In a variant not shown, the piston actuation system is formed by a hydraulic actuation system known as a concentric driven cylinder (CSC) system and comprises a fixed chamber containing hydraulic fluid, which is connected to a fixed part of the actuation system, and a mobile part which translates axially under the action of pressurized hydraulic fluid, which mobile part is connected to the piston 20 of the clutch module 1 via a rolling bearing 39.

[0109] Such hydraulic actuation systems may be incorporated in a similar manner into systems using ball guideways.

[0110] In other words, the torque transmission system 100 performing clutch and damper functions is intended for a hybrid vehicle equipped with a combustion engine and a rotating electric machine, and the clutch module 1 is intended to couple / decouple the combustion engine to the vehicle's transmission line.

[0111] 3 illustrates another exemplary embodiment in which the ball guideway system 42 is replaced by a fork operated actuation system 400.

[0112] The fork-operated actuation system 400 comprises a fork 401. The fork 401 is connected to the casing 70 and configured to be driven axially (parallel to the first axis of rotation X) directly or indirectly by a mechanical drive system comprising an electric motor (not shown). At its radially inner end, the fork 401 axially abuts a circlip 403 fixed to a ring 402.

[0113] The fork 401 moves from the engaged position to the disengaged position by axially abutting against the circlip 403 and thereby pulling the ring 402 in the axial direction.

[0114] In the disengaged position, an axial gap is created between the ring 402 and a fixed support 406 connected to the casing 70. Thus, the piston 20 can move axially between the engaged and disengaged positions, as described in the exemplary embodiment above.

Claims

1. A normally closed type clutch module (1) having a first rotating shaft (X), an output disk carrier (3) rotatable about the first rotation axis (X); At least one friction disc (6), in particular a multi-disc assembly (5), a piston (20) configured to clamp the friction discs when the clutch module is in an engaged position and to release the friction discs when the clutch module is in a disengaged position; a resilient device (30) configured to exert a resilient return force on the piston (20) to retain the piston (20) in the engaged position; a piston actuating system (40) for actuating the piston (20), the piston actuating system (40) axially abutting against the piston (20) on the one hand and against the output disc carrier (3) on the other hand, preferably via a rolling bearing, and configured to move the piston (20) from the engaged position to the disengaged position against the elastic return force of the elastic device (30).

2. 2. The clutch module (1) according to claim 1, wherein the resilient device (30) abuts axially against the output disc carrier (3).

3. It is particularly adapted to be assembled into a torque transmission system (100) for a motor vehicle, an input module (350) cooperating with said clutch module (1); 3. The clutch module (1) of claim 1 or 2, wherein the input module (350) is upstream of the clutch module.

4. 4. The clutch module (1) of claim 3, wherein when assembled to the input module (350), the clutch module (1) is located radially inside an outer periphery that passes through the elastic member (304) of the damper (300) of the input module (350).

5. The clutch module (1) according to any one of claims 1 to 4, comprising a transfer ring (80) configured for rotational cooperation with a rotor shaft (210) of a rotating electric machine, optionally with a reduction gear assembly (220) interposed between the transfer ring and the rotor shaft of the rotating electric machine, the transfer ring (80) connected to the output disc carrier (3) meshing in particular with a gear wheel connected to the rotor shaft (210) of the rotating electric machine via the reduction gear assembly (220).

6. 6. The clutch module (1) according to claim 5, wherein the transfer ring (80) axially faces the elastic member (304) of the damper.

7. 7. The clutch module (1) according to claim 5 or 6, wherein the transfer ring (80), the multi-disc assembly (5) and the actuation system (40) for actuating the piston (20) are radially stacked.

8. The clutch module (1) according to any one of claims 1 to 7, wherein the piston (20) cooperates with a rolling bearing mounted on the actuation system (40) to cause the actuation system (40) to cooperate with the piston (20) while the piston (20) is free to rotate about the first axis of rotation (X) relative to the actuation system (40).

9. A clutch module (1) according to any one of the preceding claims, wherein the piston (20) comprises at least one actuating finger passing axially through the resilient device (30).

10. The clutch module (1) according to any one of the preceding claims, wherein the elastic device (30) comprises at least one elastic washer (36), in particular a Belleville spring washer, or a number of helical springs connected to each other at their ends.

11. The clutch module (1) according to any one of the preceding claims, wherein the actuation system (40) is a ball guideway system.

12. A torque transmission system (100), in particular for a motor vehicle, comprising: The clutch module, in particular a wet clutch module, according to any one of claims 1 to 11 and an input module (350) integrally assembled therewith, the input module (350) is upstream of the clutch module; said input module and said clutch module are arranged in particular in a casing (70), Said clutch module (1) is in particular connected to an electric machine, a torque transmission system (100).

13. the input module (350) comprises a damper and an input disc carrier (2) arranged axially and / or radially facing the output disc carrier (3) of the clutch module (1) and connected to an output portion of the damper (300); 13. The torque transmission system (100) according to claim 12, in particular wherein said actuation system (40) abuts against a side of said piston (20), said side facing said input module (350).

14. The input module includes an input disk carrier (2) arranged facing the output disk carrier (3); the input disc carrier (2) and the output disc carrier (3) have radial zones (15, 16) facing each other, 14. A torque transmission system (100) according to claim 12 or 13, wherein an axial bearing (37), in particular formed by an axial thrust needle bearing or a plain axial bearing, is interposed between these mutually facing radial zones.

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