FR3081949A1 - TRANSMISSION DEVICE FOR HYBRID VEHICLE - Google Patents

Abstract

The invention relates to a torque transmission device (1), comprising: - a torque input element (2), - a first torque output element (3), - a rotary electric machine (12) comprising a rotor (13), - an intermediate element (5) defining a rotor support, - an actuating member (40) with a rotary stop associated with the input clutch (10), - a protective casing (46 ) arranged to at least partially envelop the torque input element (2), the torque output element (3), the rotary electric machine (12), the intermediate element (5) and the member d actuation (40), and - at least one rolling member (47) disposed radially between the intermediate element (5) and the protective casing (46), in which the input clutch (10), the actuating member (40) associated with the input clutch (10) and the at least one rolling member (47) succeed one another radially in approach to the axis (X).

Description

The present invention relates to the field of transmissions for motor vehicles. It relates in particular to a torque transmission device intended to be placed in the traction chain of a motor vehicle, between a heat engine and a gearbox.

The invention relates more specifically to a torque transmission device for a hybrid type motor vehicle in which a rotating electric machine is arranged in the traction chain.

In the state of the art, transmission assemblies are known, arranged between the gearbox and the heat engine and comprising a rotary electric machine and a clutch on the engine side making it possible to couple the crankshaft of the heat engine to the rotor in rotation. of the rotating electric machine. Thus, it is possible to shut down the heat engine at each stop of the vehicle and to restart it thanks to the rotating electric machine. The rotating electric machine can also constitute an electric brake or provide excess energy to the heat engine to assist it or prevent it from stalling. The rotating electric machine can also drive the vehicle. When the engine is running, the rotating electrical machine acts as an alternator. Such a transmission assembly can also link the rotary electrical machine to the gearbox by two separate torque paths each comprising an output clutch and a gearbox input shaft.

There are devices comprising three separate actuators for actuating the three clutches, an input clutch between the heat engine and the rotary electric machine and two output clutches between the rotary electric machine and the two input shafts of a gearbox. In these devices, the rotary electrical machine comprises a stator and a rotor driven in rotation about an axis of rotation. Document DE102007003107 discloses a triple clutch in which the actuations are of the piston type with actuation chamber and balancing chamber. A problem with this type of architecture is found in the complexity of mounting the transmission device.

The invention thus aims to make it possible to benefit from a torque transmission device allowing reliable and simplified mounting. The invention also aims to make it possible to benefit from a torque transmission device making it possible to reconcile the requirements of axial and radial compactness while having a long service life and a high efficiency.

The rotary electrical machine and its components (rotor, stator, sensor (s), etc.) are particularly heavy and include an imbalance linked to their manufacture and to their assembly, which is likely to increase the load on the support of the rotor. In addition, an acceleration of the vehicle can multiply by 10 or 20 the load on the rotor support. It is therefore also necessary to have a torque transmission device making it possible to support and guide in rotation this rotary electrical machine and in particular the rotor.

The invention achieves this, according to one of its aspects, thanks to a torque transmission device, in particular for a motor vehicle, comprising:

- a torque input element in rotation about an axis X, capable of being coupled in rotation to a crankshaft of a heat engine,

- a first torque output element, capable of being coupled in rotation to a first input shaft of a gearbox,

- a rotating electrical machine comprising a rotor,

an intermediate element defining a rotor support, said intermediate element and said rotor being arranged in the direction of the torque transmission between the input element and the first output element and being selectively connected to the input element by an input clutch and to the first output element by a first output clutch,

- an actuator with a rotary stop associated with the input clutch,

a protective casing arranged to at least partially envelop the torque input element, the torque output element, the rotary electrical machine, the intermediate element and the actuating member, and

- at least one rolling member arranged radially between the intermediate element and the protective casing, in which the input clutch, the actuating member associated with the input clutch and the at least one member of bearing succeed one another radially in proximity to the X axis.

This configuration thus makes it possible to stack the elements radially so that a device is axially compact.

Within the meaning of the invention, the radial succession is understood in terms of radial distance.

In the following description and the claims, the terms “front” or “rear” depending on the direction relative to an axial orientation determined by the main X axis will be used without limitation and in order to facilitate understanding thereof. of rotation of the transmission of the motor vehicle and the terms "interior / internal" or "exterior / external" with respect to the axis X and in a radial orientation, orthogonal to said axial orientation.

According to another aspect of the invention, the input clutch, the actuating member associated with the input clutch and a rolling member succeed one another radially in proximity to the axis X.

According to another aspect of the invention, the device has two bearing members arranged radially between the intermediate element and the protective casing. The presence of these two bearings makes it possible to obtain improved guidance of the electric motor by the protective casing.

According to one aspect of the invention, these rolling members are arranged on the same radial height. Advantageously, the internal and external diameters of the rolling members are then identical.

According to a variant, the two bearing members are arranged on two different radial heights.

According to another aspect of the invention, the two rolling members are axially spaced at least 20 mm.

According to another aspect of the invention, the intermediate element is carried only by the protective casing. Thus, the electric machine is guided in rotation only by the protective casing in an optimized manner and without reducing its efficiency over time. In fact, the device has a particularly robust mechanical connection, of the pivot type between the rotor of the electric machine, via the rotor support, a function occupied by the intermediate element, and the protective casing as a fixed element.

The at least one rolling member is a ball joint and provides a pivot link essential for the correct guiding of the rotary electric machine. Indeed, the kinematic study of a rolling member (generally a bearing with a row of balls) leads to modeling this component by a ball joint. The mechanical actions transmissible by the contacts between the balls and the rings are essentially radial or oblique and concurrent. The torsor of mechanical actions transmissible by a bearing is therefore similar to that of a ball joint.

Advantageously, the at least one rolling member is a bearing with a row of balls.

According to another aspect of the invention, the intermediate element is carried by the protective casing only by means of at least one rolling member. This has the advantage of reducing the number of intermediate parts between the rotor and the part carrying the rotor, in this case the protective casing. Indeed, too many intermediate parts leads to an increase in the coast chain which leads to an increase in the distance between the stator and the rotor and therefore a decrease in efficiency via a decrease in the magnetic field. Thus, according to this aspect, only the rolling member (s) constitute the intermediate parts between the protective casing and the intermediate element when the latter is carried by the casing.

As a variant, the intermediate element is carried by the protective casing by means of at least one rolling member and an additional part, said part preferably being the torque input element. . Thus, according to this aspect, the rolling member or members are not the only intermediate parts between the protective casing and the intermediate element when the latter is carried by the casing.

According to another aspect of the invention, the at least one rolling member comprises an inner ring and an outer ring, said inner ring being in contact with the intermediate element and said outer ring being in contact with the protective casing.

According to another aspect of the invention, the device further comprises an actuating member with a rotary stop associated with the first output clutch, in which the first input clutch, the actuating member associated with the first clutch output, the actuating member associated with the input clutch and the at least one rolling member follow one another radially in proximity to the axis X.

According to another aspect of the invention, the first input clutch, the actuating member associated with the first output clutch, the actuating member associated with the input clutch are located on the first side of device 1, advantageously on the heat engine side.

According to another aspect of the invention, the at least one rolling member is disposed between a radial end of the protective casing and an axial portion of the intermediate element.

According to another aspect of the invention, the device further comprises:

a second torque output element capable of being coupled in rotation to a second input shaft of a gearbox, said second output element being arranged in parallel with the first torque output element in the direction of the transmission torque, the rotor being selectively connected to the second output element by a second output clutch and

- a third actuator with a rotary stop associated with the second output clutch.

According to another aspect of the invention, the first output clutch, the second output clutch and the actuating member associated with the second output clutch succeed one another radially in proximity to the axis X.

According to another aspect of the invention, the first output clutch, the second output clutch and the actuating member associated with the second output clutch are located on a second side of the device, advantageously, on the gearbox side. Thus, such a device can be considered to be extremely compact radially and axially. In fact, the clutches and the actuating members are distributed equitably so as to minimize the axial and radial dimensions.

Within the meaning of the present application, the first output clutch is that located radially on the outside, that is to say furthest from the axis of rotation X of the device. The second output clutch being the one located radially inside, that is to say the one closest to the axis of rotation of the device.

According to another aspect of the invention, there is a plane perpendicular to the axis of rotation which intersects both the first output clutch, the second output clutch and the actuator associated with the second output clutch.

According to an additional characteristic of the invention, the input clutch and / or the first and second output clutches comprise:

- an input disc holder integral in rotation with the torque input element for the input clutch, and integral in rotation with the input web for the first output clutch,

- an output disc holder integral in rotation with the input web for the input clutch, and in rotation with the first output element for the first output clutch, and

- A multi-disc assembly comprising at least one friction disc integral in rotation with one of the input and output disc carriers, at least two plates respectively disposed on either side of each friction disc, integral in rotation on the other, input and output disc holders and friction linings arranged between the plates and a friction disc, the input clutch and / or the first output clutch describing a disengaged position and a position clutch in which said plates and the friction disc pinch the friction linings so as to transmit a torque between the input disc holder and the output disc holder.

According to another aspect of the invention, the intermediate element further defines the output disc holder of the input clutch and the input disc holder of the first output clutch. Thus, the intermediate element defines at the same time the rotor support, the output disc holder of the input clutch and the input disc holder of the first output clutch. This therefore makes it possible to limit the number of parts and facilitates assembly.

According to another aspect of the invention, the input disc carrier of the input clutch is carried by an axial portion of the intermediate element.

According to one aspect of the invention, each actuator can comprise an annular piston mounted to slide axially outside an internal tube, the piston and the tube forming an actuation chamber.

According to one aspect of the invention, each actuator comprises a rotary stop carried by the piston and cooperating with the force transmission member. This actuator is also called a "CSG" type actuator ("Concentric Slave Cylinder"). The operating chamber can be sealed and filled with oil. The piston and tube are fixed in rotation so that the actuation chamber and the oil do not rotate.

According to one aspect of the invention, the rotary stop can be a bearing, in particular a rolling bearing. The rolling bearing may include an inner ring fixed to the piston, an outer ring bearing against the force transmission member and rolling bodies interposed between the inner ring and the outer ring. Preferably, the rolling bodies can be balls.

Each piston can be of revolution around the axis of rotation.

The shapes of the piston and / or of the actuating member can be chosen so that all of the clutches and actuators are evenly distributed in the device. This allows to contribute to the axial and radial compactness of the device.

According to another aspect of the invention, the device further comprises a force transmission member for each of the input clutch, the first output clutch and the second output clutch, each force transmission member being movable axially to transmit the actuating force from the actuating member to the associated clutch.

Each force transmission member may have a curved outer radial end defining a support surface for exerting the axial force on the multidisk assembly. Each force transmission member may have an inner radial end with which it cooperates with the associated actuating member.

This support surface can come to bear on the end plate of the multidisk assembly. The support surface can be continuous. The outer radial end can be a continuous crown so that the support surface is continuous. The outer radial end may comprise a plurality of fingers of axial extension and distributed around the axis so that the bearing surface is discontinuous.

Each force transmission member, in particular the force transmission member of the input clutch, may have three elbows between which are interposed planar portions. This allows axially compact actuation.

According to the invention, the clutches, namely the input clutch and the first and second output clutch, can be of the multi-disc type.

According to a characteristic of the invention, the input and output clutches are wet. The clutches being contained in at least one sealed chamber filled with a fluid, in particular oil. For the purposes of the present application, a wet clutch is a clutch which is suitable for operating in an oil bath.

According to one aspect of the invention, the first and second output elements may comprise a web whose internal periphery is grooved and capable of cooperating, respectively with a first and a second gearbox shaft.

The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly during the following description of two particular embodiments of the invention, given only by way of illustration and not limitation. , with reference to the appended figures.

Figure 1 is a sectional view of the torque transmission device according to an embodiment of the invention.

Figure 2 is a sectional view of the torque transmission device according to another embodiment of the invention.

In connection with FIG. 1, there is a torque transmission device 1 comprising:

a torque input element 2, in rotation about an axis of rotation X, capable of being coupled in rotation to a crankshaft of a heat engine (not shown),

- a first torque output element 3, capable of being coupled in rotation to a first input shaft of a gearbox (not shown),

- a second torque output element 4, capable of being coupled in rotation to a second input shaft of a gearbox (not shown) and

In the example considered, the second output element 4 is arranged in parallel with the first output element 3 in the direction of the torque transmission. Each of these elements rotates around an axis of rotation X of the device.

The first and second output elements 3, 4 respectively comprise a first and second output interface 3a, 4a whose internal periphery is grooved and able to cooperate, respectively with a first and a second gearbox shaft.

A torsion damper device (not shown) can be positioned between the crankshaft of the engine and the torque input element 2.

The device also comprises a rotary electrical machine 12 comprising a rotor 13 and a stator 14. The stator 14 is fixed and arranged around the rotor 13. The rotor 13 is arranged in the direction of the torque transmission between the input element of couple 2 on the one hand and the first output element 3 on the other hand.

In the example considered, the rotary electrical machine 12 is a synchronous permanent magnet machine.

The rotor 13 of the rotary electrical machine is selectively connected to the input element 2 by an input clutch 10, to the first output element 3 by a first output clutch 20, and to the second output element 4 by a second output clutch 30.

The device 1 also comprises an intermediate element 5 defining a rotor support. In the example considered, the intermediate element 5 is arranged between the torque input element 2 and the first 3 and second 4 torque output elements, in the sense of the torque transmission. In the example considered, an additional part 19 integral with the intermediate element 5 is provided as a rotor support. Alternatively, the rotor is placed directly on the intermediate element 5 without additional parts.

Thus, the intermediate element 5 keeps the rotary electrical machine 12 in rotation. The rotating electrical machine 12 is then called "in-line", that is to say that the axis of rotation of the rotating electrical machine 12 coincides with the axis of rotation X of the torque transmission device 1.

The input clutch 10 selectively and frictionally couples the torque input element 2 and the intermediate element 5 and includes:

- an input disc holder 11 integral in rotation with the torque input element 2,

- an output disc holder 12 defined by the intermediate element 5 and

- A multi-disc assembly 13 comprising several friction discs, here five, integral in rotation with the outlet disc holder 11, several plates respectively arranged on either side of each friction disc, integral in rotation with the disc holder inlet 12 and friction linings arranged between the plates and a friction disc, fixed on each side of the friction discs, the clutch 10 describing a disengaged position and a engaged position in which said plates and the friction disc pinch the linings friction so as to transmit a torque between the input disc holder and the output disc holder.

Each disc holder 11, 12 synchronizes in rotation the set of plates and the set of friction discs. Each disc holder 11, 12 has a cylindrical skirt on which the plates and the friction discs are mounted.

The friction discs of the multidisc assembly 13 cooperate with the cylindrical skirt of the input disc holder 11 along their radially inner periphery by splines. The friction discs are therefore radially outside the cylindrical skirt.

The plates of the multidisc assembly 13 cooperate with the cylindrical skirt of the outlet disc holder 12 along their radially outer periphery by splines. The plates are therefore radially inside the cylindrical skirt.

In the example considered, the device also comprises a first output clutch 20 selectively and frictionally coupling the intermediate element 5 and the first output element 3.

Thus, the first output clutch 20 comprises:

- an input disc holder 21 defined by the intermediate element 5,

an output disc holder 22 integral in rotation with the first output element 3 and,

- A multi-disc assembly 23 comprising several friction discs, here four, integral in rotation with the outlet disc holder 22, several plates respectively arranged on either side of each friction disc, integral in rotation with the disc holder inlet 21 and friction linings arranged between the plates and a friction disc, fixed on each side of the friction discs, the clutch 20 describing a disengaged position and a engaged position in which said plates and the friction disc pinch the linings friction so as to transmit a torque between the input disc holder and the output disc holder.

Each disc holder 21, 22 comprises a cylindrical skirt on which the plates and the friction discs are mounted.

The friction discs of the multidisc assembly 23 cooperate with the cylindrical skirt of the outlet disc holder 22 along their radially outer periphery by splines. The friction discs are therefore radially inside the cylindrical skirt.

The plates of the multidisc assembly 23 cooperate with the cylindrical skirt of the input disc holder 21 along their radially outer periphery by splines. The plates are therefore radially inside the cylindrical skirt.

In the example considered, the device 1 comprises a second output clutch 30, selectively and frictionally coupling the intermediate element 5 and the first output element 4.

The second output clutch 30 includes:

- an input disc holder 31 integral in rotation with the intermediate element 5,

an output disc holder 32 integral in rotation with the second output element 4 and,

- A multi-disc assembly 33 comprising several friction discs, here five.

In the example considered, although they are two different parts, the intermediate element 5 also defines the input disc holder of the second output clutch 30. The multidisk assembly 33 has the same technical characteristics as the multi-plate clutch assembly 20.

In common with the three clutches 10, 20 and 30, the linings can be fixed to the friction discs, in particular by gluing, in particular by riveting, in particular by overmolding. As a variant, the linings are fixed to the plates.

Each disc holder 11, 12, 21, 22, 31, 32 can synchronize in rotation all of the plates or all of the friction discs.

According to one aspect of the invention, the plates can be secured in rotation to the input disc holder 11, 21, 31 and the friction discs can be secured to the outlet disc holder 12, 22, 32. As a variant, the plates can be integral in rotation with the output disc holder 12, 22, 32. The discs can be secured in rotation with the input disc holder 11, 21, 31.

The clutches are of the wet type and comprise between two and seven friction discs, preferably four friction discs. Such multi-disc clutches make it possible to limit the radial height and limit the axial extent.

The output clutches 20, 30 can be arranged so as not to be simultaneously in the same engaged configuration. However, they can simultaneously be configured in their disengaged position.

In the example considered, the first output clutch 20 and the second output clutch 30 succeed one another radially in proximity to the axis X. There is a plane perpendicular to the axis of rotation which intersects the output clutches 20 and 30 .

In the example considered, the device 1 also comprises a protective casing 46. The protective casing 46 consists of a radial wall 46a and an axial portion 46b. The axial portion 46b defines a radial end, in particular the internal radial end of the protective casing 46.

In the example considered, the device 1 comprises an actuating member 40 and a force transmission member 41 associated with the input clutch 10. A member for holding in the disengaged position, such as a helical spring used in the example considered can be provided to push the force transmission member 41 from the input clutch 10. The input clutch is of the “normally open” type.

The force transmitting member 41 is axially movable to transmit the actuating force from the actuating member 40 to the input clutch 10. The force transmitting member exerts an axial force on the multidisk assembly 13 for moving the platters towards the discs. The actuation is thus of the "pushed" type.

The force transmission member 41 has a curved outer radial end defining a bearing surface for exerting the axial force on the multidisc assembly, continuous or discontinuous in the example considered.

The force transmission member 41 of the input clutch 10 has three elbows between which are interposed planar portions. This allows axially compact actuation.

The actuator 40 comprises an annular piston 42 slidably mounted axially outside an internal tube, the piston 42 and the tube forming an actuation chamber 43. The actuator 40 comprises a rotary stop , which here is a rolling bearing 44, carried by the piston 42 and cooperating with an inner radial end of the force transmission member 41. The fluid pressures associated with the “engaged” and “disengaged” positions are the pressures of the actuation chamber 43.

The rolling bearing 44 includes an outer ring fixed to the piston, an inner ring bearing against the force transmission member and rolling bodies interposed between the inner ring and the outer ring. The piston 42 is of revolution around the axis of rotation X.

In the example considered, the tube of the actuating member 40 of the input clutch is formed in the protective casing 46 which defines a network for supplying fluid to the actuating member 40 as well as the clutch cooling circuit 10.

In the example considered, the clutches 10, 20, 30 are arranged in a sealed chamber containing oil, the protective casing 46 partly defines this sealed chamber.

In the example considered, the device 1 comprises two rolling members 47 supporting the intermediate element 5, here two ball bearings. The rolling members 47 are arranged radially between the intermediate element 5 and the protective casing 46. More particularly, the rolling members 47 are arranged between a radial end of the protective casing 46, such as the axial portion 46b and a portion axial 5a of the intermediate element 5.

In the example considered, each rolling member 47 has an inner ring 47a and an outer ring 47b. Advantageously, each inner ring 47a is in contact with the intermediate element 5, preferably with the axial portion 5a of the intermediate element 5 and each outer ring 47b is in contact with the protective casing, preferably with the axial portion 46b of the protective housing 46.

Advantageously, the input clutch 10, the actuating member 40 associated with the input clutch 10 and at least one rolling member 47 succeed one another radially in proximity to the axis X. In the example considered , the input clutch 10, the actuating member 40 associated with the input clutch 10 and the two rolling members 47 follow one another radially in proximity to the axis X.

In the example considered, the two rolling members are spaced axially by a distance "I". Advantageously, the distance "I" is at least 20 mm. As shown in FIG. 1, the axial distance "I" corresponds to the edge-to-edge distance of the edges facing each other axially 47.

A circlip is formed on the axial portion 5a in order to axially lock a rolling member 47.

The protective casing 46 is arranged to at least partially envelop the torque input element 2, the torque output element 3, the rotary electric machine 12, the intermediate element 5 and the actuating member 40 .

In the example considered, the device 1 also comprises an actuating member 50, in particular an actuating member with a rotary stop and a force transmitting member 51 associated with the first output clutch 20.

The force transmission member 51 is axially movable to transmit the actuation force from the actuation member 50 to the input clutch 20.

Advantageously, the first input clutch 10, the actuating member 50 associated with the first output clutch 20, the actuating member 40 associated with the input clutch 10 and at least one rolling member 47 is succeed radially in approach to the X axis.

The device 1 also includes an actuating member 60 and a force transmitting member 61 associated with the second output clutch 30. The force transmitting member 61 is axially movable to transmit the actuating force of the member actuation 60 to the second output clutch 30.

A member for holding in the disengaged position, such as a helical spring, can be provided for pushing back the force transmission members 51, 61 from the output clutches 20, 30. The output clutches 20, 30 are of the “normally open” type. .

These actuating members 50, 60 use the same elements as those detailed in connection with the actuating member 40 of the input clutch.

In the example considered, the actuating members 40 and 50 are housed in the same casing and form only one and the same component conventionally called hydraulic control system or double concentric actuator. Thus, the actuating members 40 and 50, in particular their actuating chamber, as well as the input clutch 10 are stacked radially on the heat engine side while the actuating member 60 and the output clutches 20 and 30 are stacked radially on the gearbox side. This architecture contributes to the axial and radial compactness of the device.

According to a variant, the actuating members 50 and 60 are housed in the same envelope and form only one and the same component conventionally called hydraulic control system or double concentric actuator. The shapes of the pistons and / or of the actuating members 40, 50, 60 are chosen so that they can be stacked radially, which contributes to the axial compactness of the device 1.

The force transmission members 41, 51, 61 of the clutches 10, 20, 30 each have a curved outer radial end defining a bearing surface for exerting the axial force on the multidisk assemblies, 13, 23, 33. The actuation is thus of the "pushed" type.

In the example considered, the outer radial end of three force transmission members 41, 51, 61 comprises a plurality of fingers of axial extension, respectively numbered 73, 53, 63, and distributed around the axis X of so that their bearing surface is discontinuous. In the example considered, the fingers 73, 53 pass here through openings made in the intermediate element 5.

These fingers 73, 53 allow the force transmission members 41, 51 to be able to actuate the multi-disc assembly through the intermediate element 5.

FIG. 2 describes a second embodiment according to the invention similar to that of FIG. 1. A difference in the example considered lies in the fact that the intermediate element 5 is carried by the protective casing 46 via two rolling members 47 and an additional part, in this case the torque input element 2.

In addition, the electric machine 12 is carried at the same time by the protective casing 46 via the rolling members 47, the torque input element 2 and the intermediate element 5 on the one hand and the disc holder d 'input 21, 31 of the output clutches 20, 30 and another rolling member 48 on the other hand.

The rolling member 48 and the output clutches 20, 30 are stacked radially.

In the example considered, the actuating members 50 and 60 are housed in the same casing and form only one and the same component conventionally called hydraulic control system or double concentric actuator.

In the example considered, the first output clutch 20, the second output clutch 30, the actuator 50 and the actuator 60 succeed one another radially in proximity to the axis X.

Although the invention has been described in connection with several particular embodiments, it is obvious that it is in no way limited thereto and that it includes all the technical equivalents of the means described as well as their combinations if these are within the scope of the invention.

In the claims, any reference sign in parentheses cannot be interpreted as a limitation of the claim.

Claims (10)

1. Torque transmission device (1), in particular for a motor vehicle, comprising: - a torque input element (2) rotating around an axis (X), capable of being coupled in rotation to a crankshaft of a heat engine, - a first torque output element (3), capable of being coupled in rotation to a first input shaft of a gearbox, - a rotary electrical machine (12) comprising a rotor (13), - an intermediate element (5) defining a rotor support, said intermediate element (5) and said rotor (13) being arranged in the direction of the torque transmission between the input element (2) and the first output element (3) and being selectively connected to the input element (2) by an input clutch (10) and to the first output element (3) by a first output clutch (20), - an actuating member (40) with a rotary stop associated with the input clutch (10), - a protective casing (46) arranged to at least partially envelop the torque input element (2), the torque output element (3), the rotary electric machine (12), the intermediate element ( 5) and the actuating member (40), and - at least one rolling member (47) disposed radially between the intermediate element (5) and the protective casing (46), characterized in that the input clutch (10), the actuating member ( 40) associated with the input clutch (10) and the at least one rolling member (47) follow one another radially in proximity to the axis (X). 2. Device (1) for transmitting torque according to claim 1, characterized in that it has two rolling members (47) arranged radially between the intermediate element (5) and the protective casing (46). 3. Device (1) for transmitting torque according to the preceding claim, characterized in that the two rolling members (47) are axially spaced at least 20 mm. 4. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that the intermediate element (5) is carried by the protective casing (46) only by means of at least one rolling element (47). 5. Device (1) for transmitting torque according to any one of claims 1 to 3, characterized in that the intermediate element (5) is carried by the protective casing (46) by means of at least a rolling member (47) and an additional part, said part preferably being the torque input element (2). 6. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that the at least one rolling member (47) comprises an inner ring (47a) and an outer ring (47b), said inner ring (47a) being in contact with the intermediate element (5) and said outer ring (47b) being in contact with the protective casing (46). 7. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that it further comprises an actuating member (50) with a rotary stop associated with the first output clutch (20), wherein the first input clutch (10), the actuator (50) associated with the first output clutch (20), the actuator (40) associated with the input clutch (10 ) and the at least one rolling member (47) succeed one another radially in proximity to the axis (X). 8. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that the rolling member (47) is disposed between a radial end of the protective casing (46) and an axial portion (5a ) of the intermediate element (5). 9. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that it further comprises: - a second torque output element (4), capable of being coupled in rotation to a second input shaft of a gearbox, said second output element (4) being arranged in parallel with the first output element of torque (3) in the direction of torque transmission, the rotor (12) being selectively connected to the second output element by a second output clutch (30) and - a third actuator (60) with a rotary stop associated with the second output clutch (30). 10. Device (1) for transmitting torque according to the preceding claim, characterized in that the first output clutch (20), the second output clutch (30) and the actuating member (60) associated with the second clutch output (30) follow one another radially in proximity to the axis (X).