Transmission module

Abstract

Transmission module, comprising: a casing (70) containing transmission fluid; a first sealing gasket (97) and a second sealing gasket (98) adapted to make the casing (70) watertight; a wet type torque transmission system (100) comprising: a torsional oscillation damper (300) having a torque input element (309) having a window (311) adapted for the passage of a linking member securing it in rotation to a crankshaft, a secondary support (310), and elastic members (304); a torque output element (302) rotationally linked to a gearbox input element; a clutch (1) selectively coupling the secondary support (310) with the torque output element (302); and a transmission ring (80) rotationally linked to the torque output element (302) and cooperating with a rotating electrical machine (200);the first and second sealing joints being positioned radially above the window (311). (Abstract figure: 4);

Description

Title of the invention: Transmission module technical field

[0001] The present invention relates to the field of transmissions for motor vehicles. It relates in particular to a torque transmission module intended to be placed in the powertrain of a motor vehicle, between an internal combustion engine and a gearbox.

[0002] It relates more specifically to a torque transmission module for a hybrid type motor vehicle in which a rotating electric machine is disposed in the traction chain. Technological background

[0003] In the prior art, hybrid motor vehicles are known to comprise a torque transmission module situated between an internal combustion engine (also called a "heat engine") and a gearbox, a rotating electric machine, and a clutch that allows the rotational coupling or disengagement of a crankshaft of the internal combustion engine to a rotor shaft of the rotating electric machine. Thus, it is possible to couple the internal combustion engine each time the vehicle stops and to restart it using the rotating electric machine. The rotating electric machine can also act as an electric brake or provide additional energy to the internal combustion engine to assist it or prevent it from stalling. When the internal combustion engine is running, the electric machine can act as a generator.The rotating electric machine can also provide vehicle propulsion independently of the internal combustion engine.

[0004] Such a torque transmission module is of the wet type; it operates by immersion in a transmission fluid such as oil. The current management of this transmission fluid is not entirely satisfactory. Summary

[0005] The invention aims to optimize the quantity of transmission fluid present in the transmission module while reconciling the requirements of axial and radial compactness.

[0006] The invention achieves this by means of a transmission module, particularly for motor vehicles, comprising:

[0007] - a housing comprising a first side wall and a second side wall defining between them a chamber adapted to contain transmission fluid;

[0008] - a first sealing gasket and a second sealing gasket adapted to make the watertight casing;

[0009] - a wet-type torque transmission system housed in the chamber of the crankcase,

[0010] said torque transmission system having a first axis of rotation and comprising:

[0011] - a torsional oscillation damper comprising a torque input element pivoting around the first axis of rotation and having a window adapted for the passage of a linking element which rotationally secures said torque input element to a crankshaft of an internal combustion engine, a secondary support, and elastic elements which elastically couple the torque input element to the secondary support in rotation;

[0012] - an output element of the pivoting torque about the first axis of rotation and suitable to be linked in rotation, directly or indirectly, to at least one input element of a gearbox;

[0013] - a clutch selectively coupling the secondary support of the shock absorber of torsional oscillations with the torque output element; and

[0014] - a transmission ring rotationally linked to the torque output element and configured to cooperate in rotation, directly or indirectly, with a rotor shaft of a rotating electrical machine;

[0015] characterized in that the first sealing gasket and the second sealing gasket are positioned radially above the window of the torque input element.

[0016] This structure optimizes the amount of transmission fluid contained in the housing. The radial placement of the first and second seals above the torque input element window, and therefore the large diameter of these two seals, reduces the amount of transmission fluid in the housing without compromising the operation of the transmission system. Furthermore, the positioning of the two seals allows the transmission module to be secured to the crankshaft once it is mounted, thus simplifying its manufacture. In addition, the compactness, particularly the axial dimensions, of the transmission module is maintained, as are its filtration capabilities.

[0017] The housing provides protection for the torque transmission system and allows all the components of the transmission module to be brought together in a single sub-assembly.

[0018] For the purposes of this application: • “axially” means “parallel to the first axis of rotation”; • “Radially” means “along an axis belonging to an orthogonal plane” to the first axis of rotation and cutting across this first axis of rotation"; • “circumferentially” means “around the first axis of rotation”; • Parts are said to be "axially opposite" when they are all traversed by the same right circular cylindrical surface having as its axis of revolution the first axis of rotation and offset from each other parallel to this first axis of rotation; • Two parts are said to be "rotationally fixed" when they are "assembled in such a way that they do not rotate relative to each other." In other words, it is a rigid connection that prevents rotation, possibly with very little play such as spline play. This connection can be made directly between the first and second parts or via one or more intermediate parts; • Two parts are said to be "fixed" when they are permanently immobilized relative to each other, this immobilization being able to result from the first part being fixed to the second part directly or through one or more intermediate parts.

[0019] According to a further feature of the invention, the first sealing gasket and the second sealing gasket are positioned radially above the window of the torque input element. Thus, the passage for the connecting member is completely unobstructed, which facilitates the mounting of the transmission module onto the crankshaft.

[0020] According to a further feature of the invention, the first sealing gasket and the second sealing gasket are annular. Thus, the sealing gaskets are standardized and less expensive to produce.

[0021] According to a further feature of the invention, the first sealing gasket and the second sealing gasket are axially aligned. Thus, there is a straight line, parallel to the first axis of rotation, which passes through the two sealing gaskets.

[0022] According to a further feature of the invention, the torque transmission system further comprises a first radial bearing, adapted to ensure the centering of the torque output element with the housing, and a second radial bearing, adapted to ensure the centering of the torque input element with the housing, the first and second seals being positioned radially between the window of the torque input element and the first and second radial bearings. Thus, the precise positioning of the seals makes it possible to combine optimization of the amount of transmission fluid in the housing, module performance, its compactness, and ease of assembly.

[0023] According to an additional feature of the invention, the first radial bearing is adapted to support and center the clutch.

[0024] According to an additional feature of the invention, the second radial bearing is adapted to support and center the torsional oscillation damper.

[0025] According to a further feature of the invention, the first seal and the second seal are fully positioned radially between the window of the torque input element and the first and second radial bearings.

[0026] According to an additional feature of the invention, the first radial bearing and the second radial bearing have a mounting diameter greater than the mounting diameter of the first seal and the second seal.

[0027] According to a further feature of the invention, the torque transmission system further comprises a third radial bearing, adapted to ensure the centering of the torque input element with the torque output element, the first and second seals being positioned radially between the window of the torque input element and the first, second, and third radial bearings. Thus, the precise positioning of the seals makes it possible to combine optimization of the amount of transmission fluid in the housing, module performance, module compactness, and ease of assembly.

[0028] According to an additional feature of the invention, the third radial bearing is adapted to support and center the clutch.

[0029] According to a further feature of the invention, the first seal and the second seal are fully positioned radially between the window of the torque input element and the first, second and third radial bearings.

[0030] According to an additional feature of the invention, the first radial bearing, the second radial bearing and the third radial bearing have a mounting diameter greater than the mounting diameter of the first seal and the second seal.

[0031] According to a further feature of the invention, the transmission module further comprises a third sealing gasket positioned radially between the window of the torque input element and the first and second radial bearings. Thus, the presence of a third sealing gasket ensures the sealing of the housing regardless of its shape.

[0032] According to an additional feature of the invention, the third sealing ring is positioned radially between the window of the torque input element and the first, second and third radial bearings.

[0033] According to an additional feature of the invention, the third sealing gasket is fully positioned radially between the window of the torque input element and the first and second radial bearings.

[0034] According to an additional feature of the invention, the third sealing ring is fully positioned radially between the window of the torque input element and the first, second and third radial bearings.

[0035] According to a further feature of the invention, the third sealing gasket is annular. Thus, the sealing gaskets are standardized and less expensive to produce.

[0036] According to a further feature of the invention, the first sealing gasket, the second sealing gasket, and the third sealing gasket are axially aligned. Thus, there exists a straight line, parallel to the first axis of rotation, which passes through the three sealing gaskets.

[0037] According to a further feature of the invention, the first seal and the second seal each extend between a radially inner edge and a radially outer edge, the radially outer edge of the first seal and the radially outer edge of the second seal having the same diameter. Thus, the seals are standardized and less expensive to produce.

[0038] According to a further feature of the invention, the radially inner edge of the first sealing gasket and the radially inner edge of the second sealing gasket have the same diameter. Thus, the sealing gaskets are standardized and less expensive to produce.

[0039] According to a further feature of the invention, the transmission module further comprises a third sealing gasket extending between a radially inner edge and a radially outer edge, the radially outer edge of the third sealing gasket having the same diameter as the radially outer edge of the first and second sealing gaskets. Thus, the sealing gaskets are standardized and less expensive to produce.

[0040] According to a further feature of the invention, the radially inner edge of the third sealing gasket has the same diameter as the radially inner edge of the first and second sealing gaskets. Thus, the sealing gaskets are standardized and less expensive to produce.

[0041] According to a further feature of the invention, the first sealing gasket is identical to the second sealing gasket. Thus, the sealing gaskets are standardized and cost less to produce.

[0042] According to a further feature of the invention, the third sealing gasket is identical to the first and second sealing gaskets. Thus, the sealing gaskets are standardized and less expensive to produce.

[0043] According to an additional feature of the invention, the third sealing joint is located between the torque output element and the torque input element.

[0044] According to an additional feature of the invention, the third sealing joint is located radially between the torque output element and the torque input element.

[0045] According to a further feature of the invention, the first sealing gasket is located between the housing and the torque output element and / or in which the second sealing gasket is located between the housing and the torque input element.

[0046] According to a further feature of the invention, the first sealing gasket is located radially between the housing and the torque output element and / or in which the second sealing gasket is located radially between the housing and the torque input element.

[0047] According to a further feature of the invention, the first side wall has a radially inward edge in contact with the first sealing gasket, said first side wall being traversed by at least one first passage provided for the flow of the transmission fluid towards said first sealing gasket. Thus, the centrifugal force, linked to the rotation of the transmission module, and the first passage allow the transmission fluid to flow and lubricate the various elements constituting said transmission module with a minimum initial quantity of transmission fluid.

[0048] According to a further feature of the invention, the first passage is provided for the flow of the transmission fluid between the chamber and the first sealing joint. Thus, the circulation of the transmission fluid within the transmission module is improved.

[0049] According to a further feature of the invention, the input element of the torque is traversed by at least one second passage arranged for the flow of the transmission fluid towards the second seal. Thus, the centrifugal force, linked to the rotation of the transmission module, and the second passage allow the transmission fluid to flow and lubricate the various elements constituting said transmission module with a minimum initial quantity of transmission fluid.

[0050] According to an additional feature of the invention, the input element of the torque is a single piece.

[0051] According to a further feature of the invention, the torque input element comprises a crankshaft hub and a primary support linked together.

[0052] According to a further feature of the invention, the primary support and / or the crankshaft hub is traversed by at least one second passage provided for The lubricant's path to the second seal is improved, thus enhancing the transmission fluid circulation within the transmission module.

[0053] According to a further feature of the invention, the torque transmission system further comprises a clutch actuation system, said actuation system being traversed by at least one third passage arranged for the flow of the transmission fluid. Thus, the circulation of the transmission fluid within the transmission module is improved.

[0054] According to a further feature of the invention, the clutch is of the normally closed type and comprises:

[0055] - an input disk holder rotationally linked to the secondary support;

[0056] - an output disc holder rotationally linked to the output element of the torque;

[0057] - at least one friction disc disposed between an input disc holder and the holder- output disk;

[0058] - a piston configured so that, in an engaged position of the clutch, the piston exerts a positive force on at least one friction disc, and so that, in a disengaged position of the clutch, the piston exerts zero force on at least one friction disc;

[0059] - an elastic device configured to exert an elastic restoring force on the a piston to hold said piston in the engaged position. Thus, with a normally closed clutch, it is not necessary to continuously activate the actuation system to transmit the torque from the internal combustion engine, which is the most common operating situation for the vehicle. The invention allows for energy savings. Furthermore, in the event of a system failure, the vehicle remains fully operational.

[0060] According to a further feature of the invention, at least one of the input disc carrier, the output disc carrier, and the piston includes an opening adapted for the passage of the transmission fluid contained in the housing. Thus, the circulation of the transmission fluid within the transmission module is improved.

[0061] According to a further feature of the invention, the primary and / or secondary support of the torsional oscillation damper includes at least one opening adapted for the passage of a transmission fluid contained in the housing. Thus, the circulation of the transmission fluid within the transmission module is improved.

[0062] The actuation system can be of mechanical, electromechanical, electromagnetic, or hydraulic type.

[0063] The speed reduction assembly amplifies the torque supplied by the rotor shaft of the rotating electrical machine. Advantageously, the speed reduction assembly can be implemented, for example, by a set of cylindrical gears cooperating kinematically in rotation with the rotor shaft of the rotating electrical machine. Alternatively, the reduction unit can also be made using pulleys driven by belts, or gears driven by chains. One or more reduction stages are possible depending on the desired gear ratio. The speed reduction unit can also be configured to allow for multiple speed ratios.

[0064] According to a further feature of the invention, the transmission module comprises a predetermined quantity of transmission fluid contained in the housing, the transmission fluid being, for example, an oil. The predetermined quantity is adapted so that at least a portion of the elastic components are immersed in the transmission fluid. Thanks to this latter feature, the lubrication of the elastic components is ensured.

[0065] The invention further relates to a powertrain comprising a transmission module as described above and a rotating electrical machine. Brief description of the figures

[0066] [Fig-1] The [Fig. 1] is a representation in a first plane of section, of a torque transmission system according to an embodiment of the invention.

[0067] [Fig.2] The [Fig.2] is a detailed representation in a second plane of section of the torque transmission system the [Fig.1].

[0068] [Fig.3] The [Fig.3] is a detailed representation of the [Fig.1].

[0069] [Fig.4] Fig.4 is a representation in a third plane of section of the system of torque transmission [Fig.1]. Description of the implementation methods

[0070] In all the figures, identical elements or elements performing the same function are identified by the same reference numerals. The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference numeral relates to the same embodiment or that the features apply only to a single embodiment. Simple features from different embodiments can also be combined or interchanged to provide other embodiments.

[0071] Figures 1 to 4 show a cross-sectional view of a torque transmission system 100 according to an embodiment of the invention. The torque transmission system 100 is part of a drivetrain of a motor vehicle's transmission line. The drivetrain comprises a rotating electric machine 200 equipped with a stator and a rotor. The vehicle can be propelled, depending on requirements, by an internal combustion engine or by the rotating electric machine 200.

[0072] The transmission system 100 can be housed in the casing 70 to form a transmission module. The casing 70 comprises a first side wall 71 and a second side wall 72. The first side wall 71 and the second side wall 72 define a chamber 73 adapted to contain transmission fluid. The transmission system 100 is housed in the chamber 73 of the casing 70. The first wall 71 extends radially between a radially inner edge 71e and a radially outer edge 71e. The casing 70 is formed by two assembled half-shells.

[0073] Here the transmission system 100 is described as "wet," meaning that the components housed in the casing 70 are in an oil mist or partially immersed. A first seal 97 and a second seal 98 may be provided to seal the casing 70. In addition, a third seal 99 may be provided to seal the casing 70.

[0074] The first sealing gasket 97 and / or the second sealing gasket 98 and / or the third sealing gasket 99 is annular.

[0075] The first sealing ring 97 extends between a radially inner edge 97i and a radially outer edge 97e. The second sealing ring 98 extends between a radially inner edge 98i and a radially outer edge 98e. The radially outer edge 97e of the first sealing ring 97 and the radially outer edge 98e of the second sealing ring 98 have the same diameter. The radially inner edge 97i of the first sealing ring 97 and the radially inner edge 98i of the second sealing ring 98 have the same diameter. The first sealing ring 97 and the second sealing ring 98 are axially aligned. The first sealing ring 97 is identical to the second sealing ring 98.

[0076] The third sealing gasket 99 extends between a radially inner edge 99i and a radially external edge 99e. The radially external edge 99e of the third seal 99 has the same diameter as the radially external edge 97e of the first seal 97 and the radially external edge 98e of the second seal 98. The radially internal edge 99i of the third seal 99 has the same diameter as the radially internal edge 97i of the first seal 97 and the radially internal edge 98i of the second seal 98. The third seal 99 is axially aligned with the first seal 97 and with the second seal 98. The third seal 99 is identical to the first seal 97 and the second seal 98.

[0077] As illustrated in particular in [Fig. 1], the torque transmission system 100 has a first axis of rotation X. The torque transmission system 100 The torsional oscillation damper 300 comprises a torsional oscillation damper 309. This damper includes a torque input element 309 pivoting about the first axis of rotation X and adapted to be rotationally linked to a crankshaft V of an internal combustion engine, a secondary support 310, and elastic elements 304 that rotationally couple the torque input element 309 to the secondary support 310. As is known, the torsional oscillation damper 300 serves to filter the torsional oscillations (or acyclic movements) of the internal combustion engine. In the embodiment of [Fig. 1], the elastic elements 304 are four curved helical springs.

[0078] The torque input element 309 comprises at least one window 311. At least one window 311 is adapted for the passage of a connecting member 312 that rotationally secures said torque input element 309 to the crankshaft V. The connecting member 312 may be a screw. Preferably, the torque input element 309 comprises a plurality of windows 311 uniformly distributed around the first axis of rotation X.

[0079] The torque input element 309 can be a single piece.

[0080] Alternatively, the torque input element 309 may comprise a primary support 301 and a crankshaft hub 306. The crankshaft hub 306 comprises at least one window 311. Elastic members 304 elastically couple the primary support 301 to the secondary support 310 in rotation. As illustrated in particular in [Fig. 2], in the center, the primary support 301 may be driven by the crankshaft hub 306 via, for example, rivets 318 (visible in [Fig. 3]). Alternatively, the primary support 301 may be driven by the crankshaft hub 306 via, for example, a splined connection (not visible).

[0081] The first sealing gasket 97 is located radially between the housing 70 and the torque output element 302. More particularly, the first sealing gasket 97 is located radially between the radially inner edge 71 of the first side wall 71 of the housing 70 and the torque output element 302. The first sealing gasket 97 is located, preferably entirely, radially above at least one window 311 of the torque input element 309.

[0082] The second sealing gasket 98 is located radially between the housing 70 and the torque input element 309. More particularly, the second sealing gasket 98 is located radially between the second side wall 72 of the housing 70 and the crankshaft hub 306. The second sealing gasket 98 is located, preferably entirely, radially above at least one window 311 of the torque input element 309.

[0083] The third sealing joint 99 is located radially between the outlet element of the couple 302 and the input element of couple 309. More specifically, the third sealing gasket 99 is located radially between the output element of couple 302 and the crankshaft hub 306. The third sealing gasket 99 is located, preferably entirely, radially above at least one window 311 of the torque input element 309.

[0084] The torque transmission system 100 may further include an additional inertial mass 9 fixed rigidly to the torsional oscillation damper 300. In the embodiment of [Fig.1], the additional inertial mass 9 is in the form of an added annular ring welded onto the primary support 301. The additional inertial mass 9 has a second thickness equal to its largest axial dimension, preferably between 8 and 30 mm.

[0085] In order to ensure the filtering of torsional oscillations in a radially compact footprint, the inertia of the additional inertia mass 9 can advantageously be between 20 and 70% of the inertia of the torsional oscillation damper 300, the inertia of the additional inertia mass 9 being preferably between 35 and 55% of the inertia of the torsional oscillation damper 300.

[0086] The torque transmission system 100 further includes a torque output element 302, here in the form of a hub having an internal spline, pivoting around the first axis of rotation X and suitable for being rotationally linked, directly or indirectly, to at least one input element, for example a splined shaft, of a gearbox BV.

[0087] As illustrated in particular in [Fig.2], the torque transmission system 100 further comprises a clutch 1 selectively coupling the secondary support 310 of the torsional oscillation damper 300 with the torque output element 302.

[0088] The torque transmission system 100 further comprises a transmission ring 80 rotationally linked to the torque output element 302 and configured to cooperate in rotation, directly or indirectly, with a rotor shaft 210 of the rotating electrical machine 200.

[0089] The elastic elements 304, the additional inertial mass 9 and the transmission ring are arranged axially opposite each other, the elastic elements 304 being axially positioned between the additional inertial mass 9 and the transmission ring 80, the elastic elements 304 being positioned radially outside the clutch 1.

[0090] “Axially opposite” means that the elastic organs 304, the inertial mass additional 9 and transmission ring 80 are all crossed by the same right circular cylindrical surface having as its axis of revolution the first axis of rotation X and offset from each other parallel to this first axis of rotation X.

[0091] The primary support 301 can be formed, in particular as a single piece, by a stamping and / or bending process from a metal sheet having a first The thickness is preferably between 2 and 5 mm. The primary support 301 may include a radially extending central portion 303, with the central portion 303 and the additional inertial mass 9 overlapping axially. The primary support 301 may include several drive arms 305 configured to transmit torque from the primary support 301 to the elastic elements 304, the drive arms 305 projecting axially and arranged circumferentially between the elastic elements 304.

[0092] The primary support 301 and / or the secondary support 310 includes at least one opening adapted for the passage of the transmission fluid. More specifically, the drive arms 305 may contain at least one opening.

[0093] As illustrated in particular in [Fig. 3], the secondary support 310 may include a suitable shape 316 for retaining the elastic elements 304 radially and axially. This suitable shape 316 may include a first wall 313 facing axially to the elastic elements 304, a second wall 314 positioned directly radially above the elastic elements, and a third wall 315 positioned directly radially below the elastic elements 304. The suitable shape 316 may therefore have a generally U-shaped cross-section. The suitable shape 316 may include at least one opening adapted for the passage of the transmission fluid. Advantageously, the secondary support 310 may be formed, in particular as a single piece, by a stamping and / or bending process from a sheet metal.

[0094] In another embodiment not shown, the primary support 301 may include the adapted shape 316 to retain radially and axially the elastic members 305, and the secondary support 310 may include the drive arms 305 projecting axially and arranged circumferentially between the elastic members 304.

[0095] The torque transmission system 100 may further include a first radial bearing 319. The first radial bearing 319 may be a needle roller centering bearing adapted to run against a support 320. The support 320 has a surface with a higher local hardness. The first radial bearing 319 is located radially between the torque output element 302 and the housing 70. More specifically, the first radial bearing 319 is located radially between the torque output element 302 and the radially inner edge 71 of the first side wall 71 of the housing 70. The first radial bearing 319 is adapted to center the torque output element with the housing. The first radial bearing 319 is adapted to support and center the clutch 1.

[0096] The torque transmission system 100 may further include a second radial bearing 308. The second radial bearing 308 may be a bearing of Needle roller bearing adapted for rolling against a support. The second radial bearing 308 is located radially between the torque input element 309 and the housing 70. More specifically, the second radial bearing 308 is located radially between an axial extension portion 307 of the crankshaft hub 306 and the second side wall 72 of the housing 70. The second radial bearing 308 is adapted to center the torque input element with the housing. The second radial bearing 308 is adapted to support and center the torsional oscillation damper 300.

[0097] The first radial bearing 319 and the second radial bearing 308 are axially misaligned. Alternatively, the first radial bearing 319 and the second radial bearing 308 are axially aligned.

[0098] The torque transmission system 100 may further include a third radial bearing 321. The third radial bearing 321 may be a needle roller centering bearing adapted to roll against a support 320. The third radial bearing 321 is located radially between the torque output element 302 and the torque input element 309. More specifically, the third radial bearing 321 is located radially between the torque output element 302 and the crankshaft hub 306. The third radial bearing 321 is adapted to center the torque output element with the torque input element. The third radial bearing 321 is adapted to support and center the clutch 1.

[0099] The third radial bearing 321 is axially misaligned with the first radial bearing 319 and / or the second radial bearing 308. Alternatively, the third radial bearing 321 is axially aligned with the first radial bearing 319 and the second radial bearing 308.

[0100] The first seal 97 is located, preferably entirely, radially below the first radial bearing 319 and the second radial bearing 308. In addition, the first seal 97 is located, preferably entirely, radially below the third radial bearing 321.

[0101] The second seal 98 is located, preferably entirely, radially below the first radial bearing 319 and the second radial bearing 308. In addition, the second seal 98 is located, preferably entirely, radially below the third radial bearing 321.

[0102] The third seal 99 is located, preferably entirely, radially below the first radial bearing 319 and the second radial bearing 308. In addition, the third seal 99 is located, preferably entirely, radially below the third radial bearing 321.

[0103] An axial bearing 32, formed by an axial needle thrust bearing or a smooth axial bearing, can be interposed axially between the crankshaft hub 306 and the housing 70.

[0104] As can be seen in particular in [Fig.3], a friction washer 317 can be interposed between the primary support 301 and the secondary support 310 in order to axially position these two parts between them and to take up the axial forces passing through the transmission system 100.

[0105] The first side wall 71 of the housing 70 includes a first through passage 75. The first passage 75 is arranged for the transmission fluid to flow to the first seal 97. The first passage 75 is arranged for the transmission fluid to flow to the first radial bearing 319. The first passage may include a vertical portion and an oblique portion.

[0106] The couple input element 309 includes a second through passage 76. The second passage 76 is designed to allow the transmission fluid to flow to the second seal 98. The second passage 76 is designed to allow the transmission fluid to flow to the third seal 99. The second passage may include an oblique portion. More specifically, the crankshaft hub 306 includes the second passage 76.

[0107] As illustrated in particular on [Fig.2], the clutch 1 may include several friction discs 6, to form a multi-disc assembly, arranged between an input disc carrier 2 rotationally linked to the secondary support 310 and an output disc carrier 3 rotationally linked to the torque output element 302. The input disc carrier 2 and the output disc carrier 3 may overlap axially.

[0108] The output disc carrier 3 may have internal teeth 18 arranged radially outside the friction discs 6 and rotationally linked with the friction discs 6, the transmission ring 80 being fixed rigidly to the output disc carrier 3.

[0109] The multi-disc clutch assembly 1 may include several friction discs 6 rotationally fixed to the input disc carrier 2, several plates 7 arranged on either side of each friction disc 6, rotationally fixed to the output disc carrier 3, and friction linings arranged between the plates 7 and the friction discs 6. The friction linings may be fixed, in particular by gluing or riveting, to the friction discs 6. Two friction linings may be fixed axially on either side of a friction disc 6.

[0110] In another embodiment not shown, a single friction lining can be fixed on a single axial side of a friction disc 6.

[0111] In another embodiment not shown, a single friction lining can be fixed axially on a single axial side of a friction disc 6 and another friction lining can be fixed on a single axial side of a plate 7.

[0112] The clutch 1 can assume a disengaged position and an engaged position in which the plates 7 and the friction discs 6 pinch the friction linings in order to transmit torque between the input disc carrier 2 and the output disc carrier 3. The output disc carrier 3 may carry an axially fixed reaction element 11 against which the multi-disc assembly is clamped in the engaged position. The reaction element 11 takes the form of a continuous annular ring around the first axis of rotation X. The plates 7 and the friction discs 6 may be radially positioned between a cylindrical skirt 12 of the output disc carrier 3 and a cylindrical skirt 14 of the input disc carrier 2. The cylindrical skirt 14 may carry radially external teeth that rotate with the friction discs 6. The clutch 1 may have between 2 and 7 friction discs, for example, 2 friction discs.

[0113] Of course, other arrangements of friction discs 6 and plates 7 can be envisaged.

[0114] The clutch 1 may also include a piston 20 configured to, in the engaged position, tighten the multi-disc assembly, and in the disengaged position, loosen the multi-disc assembly. The piston 20 may press against a counter-disc 29 to tighten the multi-disc assembly. The counter-disc 29 may be rotationally linked to the output disc carrier 3, with the possibility of axial movement.

[0115] The clutch 1 may further include an elastic device 36, for example here a Belleville-type spring washer, configured to exert an elastic return force on the piston 20 to maintain the piston 20 in the engaged position. The elastic device 36 bears axially on the end tabs 23 of the piston 20, optionally via a circlip, and on the output disc carrier 3. Such a clutch 1 is said to be of the normally closed type.

[0116] The input disc holder 2 includes at least one opening 21 adapted for the passage of the transmission fluid contained in the housing 70. The input disc holder 2 may include a plurality of openings 21.

[0117] The output disc carrier 3 includes at least one opening 21 adapted for the passage of the transmission fluid contained in the housing 70. The output disc carrier 3 may include a plurality of openings 21.

[0118] The piston 20 includes at least one opening 21 adapted for the passage of the transmission fluid contained in the housing 70. The piston 20 may include a plurality of openings 21.

[0119] The transmission system 100 may further include an actuation system 40 for the clutch 1. The actuation system 40 is configured to axially move, against the elastic return force of the elastic device 36, the piston 20 from the engaged position to the disengaged position. The actuation system 40 may bear axially on the piston 20 on one side via a bearing 39 and, on the other part, on the output disc holder 3. The actuation system 40 can be of mechanical, electromechanical, electromagnetic, or hydraulic type.

[0120] In the embodiment of Figures 1 to 3, the actuation system 40 can be formed by a ball ramp 42 which includes a first ramp 43 and a second ramp 44. A ring retaining balls (not shown) is disposed between the first ramp 43 and the second ramp 44. The first ramp 43 is in the form of a ring which is supported on a second axial bearing 38. This first ramp 43 is rotationally linked, for example via splines or via a weld 48, to an actuating lever 47. This actuating lever 47 is formed by a wheel which is toothed internally to mesh with the second ramp 44 and toothed externally to mesh, directly or indirectly, with a pinion which comes out of an actuator motor (not shown).

[0121] As illustrated in Figures 1 and 2, the input disc holders 2 and output disc holders 3 may, when approaching the first axis of rotation X, respectively comprise a first radial zone 16 and a second radial zone 15 facing each other, and a first axial bearing 37, formed by a needle thrust bearing or a plain axial bearing, is interposed between the first radial zone 16 and the second radial zone 15 facing each other. The second axial bearing 38, formed by a needle thrust bearing or a plain axial bearing, is interposed between the piston 20 actuation system 40 and the second radial zone 15 of the output disc holder 3.

[0122] The piston 20 cooperates with the bearing 39 mounted on the actuation system 40 so as to make the actuation system 40 cooperate with the piston 20 with a freedom of rotation around the first axis of rotation X, of the piston 20 relative to the actuation system 40. The first axial bearing 37, the second axial bearing 38, the bearing 39 mounted on the actuation system 40 and the actuation system 40 are arranged in an axial stacking, namely that they are all crossed by the same right circular cylindrical surface having as its axis of revolution the first axis of rotation X and offset from each other parallel to this first axis of rotation X.

[0123] The clutch 1 actuation system 40 includes at least one third passage 45. The third passage 45 is designed for the transmission fluid. More specifically, the ball ramp 42 of the actuation system 40 includes the third passage 45. More specifically, the first ramp 43 of the ball ramp 42 of the actuation system 40 includes the third passage 45.

[0124] As illustrated in [Fig. 1], the transmission system 100 may further comprise a speed reduction unit 220 adapted to kinematically cooperate in rotation between the transmission ring 80 and the rotor shaft 210 of the rotating electrical machine 200. The rotor shaft 210 rotates about a second axis of rotation XM and can be guided in rotation relative to the housing 70 by ball bearings 81. The speed reduction assembly 220 can be configured to allow several speed ratios. The transmission ring 80 is, for example, welded to the output disc carrier 3. In this embodiment, the transmission ring 80 is made in the form of a toothed wheel which cooperates in rotation with a cylindrical gear 211 rotationally linked to the rotor shaft 210, and together they form a speed reduction stage.

[0125] A predetermined quantity of transmission fluid can be contained in the housing 70, the transmission fluid being, for example, an oil. The predetermined quantity is adapted so that at least a portion of the elastic elements 304 and at least a portion of the transmission ring 80 are immersed in the transmission fluid. As illustrated in [Fig. 3], by defining a level L as a line parallel to the first axis of rotation X, the predetermined quantity of transmission fluid can be chosen so that the transmission fluid remaining at the bottom of the housing 70 reaches a horizontal plane passing through level L when the transmission system 100 is not rotating. Thus, a portion of the elastic elements 304 and a portion of the transmission ring 80 are radially above this plane passing through level L.

[0126] It is emphasized that all features, as they are apparent to a person skilled in the art from the present description, drawings and attached claims, even if in practice they have only been described in relation to other specific features, both individually and in any combinations, can be combined with other features or groups of features disclosed herein, provided that this has not been expressly excluded or that technical circumstances render such combinations impossible or meaningless.

[0127] The use of the verb "comporter", "comprendre" and its conjugated forms does not exclude the presence of other elements or other steps than those stated in a claim.

[0128] In the claims, any reference sign in parentheses shall not be interpreted as a limitation of the claim.

Claims

Demands

1. Transmission module, particularly for motor vehicles, comprising: • a casing (70) comprising a first side wall (71) and a second lateral wall (72) defining between them a chamber adapted to contain transmission fluid; • a first sealing gasket (97) and a second sealing gasket (98) adapted to make the casing (70) watertight; • a wet-type torque transmission system (100) housed in the crankcase chamber (70), said torque transmission system (100) having a first axis of rotation (X) and comprising: • a torsional oscillation damper (300) comprising a torque input element (309) pivoting about the first axis of rotation (X) and having a window (311) adapted for the passage of a linking member rotating said torque input element (309) to a crankshaft (V) of an internal combustion engine, a secondary support (310), and elastic members (304) elastically coupling in rotation the torque input element (309) to the secondary support (310); • an output element of the torque (302) pivoting around the first axis of rotation (X) and capable of being linked in rotation, directly or indirectly, to at least one input element of a gearbox (BV); • a clutch (1) selectively coupling the secondary support (310) of the torsional oscillation damper (300) with the torque output element (302); and • a transmission ring (80) rotationally linked to the torque output element (302) and configured to cooperate in rotation, directly or indirectly, with a rotor shaft (210) of a rotating electrical machine (200); characterized in that the first sealing gasket (97) and the second sealing gasket (98) are positioned radially above the window (311) of the torque input element (309).

2. Transmission module according to claim 1, wherein the torque transmission system (100) further comprises a first radial bearing (319), adapted to ensure the centering of the torque output element (302) with the housing (70), and a second radial bearing (308), adapted to ensure the centering of the torque input element (309) with the housing (70), the first seal (97) and the second seal (98) being positioned radially between the window (311) of the torque input element (309) and the first and second radial bearings (319,308).

3. Transmission module according to the preceding claim, further comprising a third sealing gasket (99) positioned radially between the window (311) of the torque input element (309) and the first and second radial bearings (319,308).

4. Transmission module according to any one of the preceding claims, wherein the first seal (97) and the second seal (98) each extend between a radially inner edge (97i,98i) and a radially outer edge (97e,98e), the radially outer edge (97e) of the first seal (97) and the radially outer edge (98e) of the second seal (98) having an identical diameter.

5. Transmission module according to the preceding claim, further comprising a third sealing gasket (99) extending between a radially inner edge (99i) and a radially outer edge (99e), the radially outer edge of the third sealing gasket (99) having a diameter identical to the diameter of the radially outer edge of the first and second sealing gaskets (97,98).

6. Transmission module according to the preceding claim or claim 3, wherein the third sealing gasket (99) is located between the torque output element (302) and the torque input element (309).

7. Transmission module according to any one of the preceding claims, wherein the first sealing gasket (97) is identical to the second sealing gasket (98).

8. Transmission module according to any one of the preceding claims, wherein the first sealing gasket (97) is located between the housing (70) and the torque output element (302) and / or wherein the second sealing gasket (98) is located between the housing (70) and the torque input element (309).

9. Transmission module according to any one of the preceding claims, wherein the first side wall (71) has a radially internal edge (71i) in contact with the first sealing joint (97), said first side wall being traversed by at least one first passage (75) arranged for the path of the transmission fluid to said first sealing joint (97).

10. Transmission module according to any one of the preceding claims, wherein the torque input element (309) is traversed by at least one second passage (76) arranged for the path of the transmission fluid to the second sealing joint (98).

11. Transmission module according to any one of the preceding claims, wherein the torque transmission system (100) further comprises an actuation system (40) for the clutch (1), said actuation system (40) being traversed by at least one third passage (45) arranged for the passage of the transmission fluid.

12. A transmission module according to any one of the preceding claims, wherein the clutch (1) is of the normally closed type and comprises: • an input disc carrier (2) rotationally linked to the secondary support (310); • an output disc carrier (3) rotationally linked to the torque output element (302); • at least one friction disc (6) disposed between an input disc carrier (2) and the output disc carrier (3); • a piston (20) configured such that, in an engaged position of the clutch (1), the piston exerts a positive force on at least one friction disc, and such that, in a disengaged position of the clutch, the piston exerts no force on at least one friction disc;

13.

14. • an elastic device (36) configured to exert an elastic restoring force on the piston (20) to maintain said piston (20) in the engaged position. Transmission module according to the preceding claim, wherein at least one of the input disc carrier (2), output disc carrier (3) and piston (20) includes an opening (21) adapted for the passage of the transmission fluid contained in the casing (70). Powertrain comprising a transmission module according to any one of the preceding claims and a rotating electrical machine (200).

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