FR3083276A1 - TRANSMISSION DEVICE FOR HYBRID VEHICLE - Google Patents

Abstract

The invention relates to a device (1) for transmitting torque, in particular for a motor vehicle, comprising: - a torque input element (2) rotating around an axis (O) comprising an axially oriented part formed by a hub (4), said element being capable of being coupled in rotation to a driving shaft, - a cylindrical hub (41) - a first wet clutch (E1) of the multi-disc type, controlled to selectively couple a shaft leading to a first shaft driven (A1) and a plug (80) intended to seal said device (1), in which said plug (80) is independent of the torque input element (2) and comprises: - a radially internal annular part (81) intended to support a part linked to the engine, and - a radially external annular part (83) in contact with the hub (4).

Description

Torque transmission device

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 between a heat engine and a gearbox, in particular of a motor vehicle or of a so-called industrial vehicle, the latter being for example a truck, public transport vehicle, or agricultural vehicle.

Patent application WO2008138506 discloses torque transmission device comprising a wet double clutch mechanism for a motor vehicle, comprising torque input means intended to be coupled to a crankshaft, a first torque output shaft, a second shaft torque output, a first clutch adapted to couple or decouple the torque input means and the first torque output shaft, a second clutch adapted to couple or decouple the torque input means and the second output shaft of couple. The first and second clutches of the multidisk type, respectively, are arranged radially one above the other. Each of the multi-plate clutches have flanges linked in rotation to an input disc holder forming the torque input means and friction discs linked in rotation to the output disc holders.

When the double clutch mechanism as described in document W02008128506 is delivered to a customer who then takes care of mounting it on a gearbox, the latter must have access to the interior of the device in order to install its own shims for adjustments. the box trees. Such an operation then obliges the supplier of the double clutch mechanism to supply its device in several separate parts, in this case, the double clutch mechanism on the one hand and the torque input element on the other hand (l torque input element also serving as a plug).

When the customer receives these parts, it is then possible for him to place his adjustment shims but he must then close the device by himself closing the system from the additional parts that have to be transmitted to the customer. Such a device thus leads to a multitude of different parts to be transmitted to the customer and leads to a complex final assembly operation.

The object of the invention is in particular to provide a simple, effective and economical solution to these problems.

The object of the present invention is in particular to propose a wet clutch mechanism for a torque transmission system making it possible to solve at least some of the drawbacks of the prior art.

The invention achieves this by proposing a torque transmission device, in particular for a motor vehicle, comprising:

a torque input element in rotation about an axis O comprising an axial orientation part formed by a hub, said element being capable of being coupled in rotation to a driving shaft, a cylindrical hub, a first wet clutch of the type multidisk, controlled to selectively couple a shaft leading to a first driven shaft and a plug intended to seal said device, in which said plug is independent of the torque input element and comprises:

a radially internal annular part intended to support a part linked to the motor, and a radially external annular part in contact with the hub.

This torque transmission device thus makes it possible, thanks to its plug independent of the torque input element, to simplify assembly operations in the factory which takes care of mounting on the gearbox. In fact, when the customer receives the device in two parts (the cap being separated from the rest of the device), he only needs to put his own adjustment shim and close with the cap.

In the following description and claims, the terms "front" or "rear" depending on the direction relative to an axial orientation determined by the main axis O 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 O and in a radial orientation, orthogonal to said axial orientation.

The invention may have one or other of the characteristics described below, combined together or taken independently of each other:

the plug further comprises a seal placed on said radially external annular part;

the plug further comprises a stop means in axial translation;

the axial translation stop means is preferably a stop;

the plug is linked in rotation and axial translation to the hub;

the plug is connected to the hub via a thread, preferably conical or cylindrical, the torque input element generally has an "L" shape;

the torque input element comprises an annular portion of radial orientation formed by an entry veil and a portion of axial orientation formed by a hub;

the entry veil and the hub are integral, preferably fixed together by welding, preferably by laser welding by transparency, friction or discharge of the capacitor;

laser welding can be continuous;

the hub is arranged radially inside with respect to the entry sail;

the hub includes an outer face and an inner face;

the radially outer annular part of the plug and the hub, preferably the inner face of the hub, are of conical shape so as to form a conical fitting;

the radially internal and external annular parts of the plug are coaxial;

the cylindrical hub may include an internal groove;

the cylindrical hub may include an external groove;

the cylindrical hub can be connected to a torque input shaft;

the cylindrical hub can be connected to a torque output shaft;

the device further comprises a second wet clutch of the multi-disc type, controlled to selectively couple a drive shaft to a second driven shaft;

the first and second clutches are arranged radially one above the other;

the first and second clutches are arranged axially one next to the other;

the second driven shaft is arranged in parallel with the first driven shaft in the direction of the torque transmission;

each of the multi-plate clutches has flanges linked in rotation to a torque input disc holder and friction discs linked in rotation to a torque output disc holder;

the torque entry disc holders together form a disc holder common to the first and second clutch;

the device further comprises an adjustment shim and a circlip;

the adjustment shim and the circlip are arranged axially between the plug and the cylindrical hub.

The invention also relates to a method for manufacturing a torque transmission device incorporating all or part of the characteristics mentioned above, comprising at least the following steps:

supply of a device comprising a torque input element, a cylindrical hub and a first wet clutch of the multi-disc type controlled to selectively couple a shaft leading to a first driven shaft, fitting the shim on the cylindrical hub, fitting of the circlip on the adjustment shim, and fitting of the plug on said device so as to make it watertight, said plug being independent of the torque input element and comprising:

a radially internal annular part intended to support a part linked to the engine, and a radially external annular part in contact with the hub of the torque input element.

According to this process, the number of parts used during assembly is reduced and assembly is simplified.

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 O 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 and the second output clutch.

The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly during the description which follows, given solely by way of example and made with reference to the accompanying drawings in which :

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

Figure 2 is an axial sectional view of the torque transmission device shown in Figure 1 assembled on a housing and after assembly of a double damping flywheel.

FIG. 3 represents an axial section of a torque input element and a plug according to a second embodiment of the invention.

Figure 4 shows a perspective view of the plug according to the second embodiment of the invention.

Figures 5a-g show views in axial section of the device during different stages of the process for manufacturing a torque transmission device of the present invention.

In relation to FIGS. 1 and 2, a first embodiment of the torque transmission device 1 has been shown. Figure 2 showing the device 1 illustrated in Figure 1 after assembly in the housing and after adding a double damping flywheel.

In the example illustrated in Figures 1 and 2, the torque transmission device 1 comprises a wet double clutch mechanism having a main axis of rotation O.

The torque transmission device 1 comprises around the axis O at least one input element 2, said torque input element which is linked in rotation to a driving shaft, such as a crankshaft of a heat engine 5. The input element 2 is located at the rear of the wet double clutch mechanism 1.

In the first embodiment, the input element 2 having an overall “L” shape, comprises an annular portion of radial orientation formed by an entry web 3 and a portion of axial orientation formed by a hub 4. The inlet web 3 and the inlet hub 4 are integral, preferably fixed together by welding such as laser welding by transparency.

The hub 4 is arranged radially inside with respect to the entry web 3.

The input hub 4 is for example, as shown in FIG. 2, linked in rotation by means of grooves at the output of a damping device (such as a double damping flywheel) whose input is linked, in particular by means of a flywheel, to the driving shaft formed by a crankshaft which is driven in rotation by an engine fitted to the motor vehicle.

The entry web 3 has, at its external radial end of axial orientation, teeth 9 which extend radially outwards and which are supported on the assembled disc holder 10. The hub 4 being in turn located at the internal radial end.

The torque transmission device 1 is controlled to selectively couple said shaft leading to a first driven shaft A1 and to a second driven shaft A2 connected to a gearbox fitted to the motor vehicle.

The double wet clutch mechanism of the torque transmission device 1 comprises a first clutch E1 and a second clutch E2, which are respectively of the multi-disc type.

Preferably, the first driven shaft A1 and the second driven shaft A2 are coaxial. The first driven shaft A1 is driven in rotation when said first clutch E1 is closed and the second driven shaft A2 is driven in rotation when said second clutch E2 is closed.

The multi-disc assembly of the first clutch E1 comprises flanges 11 linked in rotation to the assembled disc holder 10 and friction discs 12 linked in rotation to a disc holder 13, also called the output disc holder 13. The discs 12 of friction are, unitarily, axially interposed between two successive flanges 11.

The disc support 13 in the form of a revolution around the axis O comprises an axial extension 54 arranged to receive the multidisk assembly of the wet clutch, an annular portion 55 extending radially inwards from the axial extension along a plane perpendicular to the axis O.

The output disc holder 13 of the first clutch E1 is linked in rotation by meshing with the friction discs 12 and by a splined connection with said first driven shaft A1.

The outlet disc holder 13 generally has an "L" shape, the inner radial end of which is secured to a grooved outlet hub.

The multi-disc assembly of the second clutch E2 also includes flanges linked in rotation to the assembled disc holder 10 and friction discs linked in rotation to a disc support 23, also called output disc holder 23.

The disc support 23 in the form of a revolution around the axis O comprises an axial extension 44 arranged to receive the multidisk assembly of the wet clutch, an annular portion 45 extending radially inwards from the axial extension along a plane perpendicular to the axis O.

The output disc holder 23 of the second clutch E2 is linked in rotation by meshing with the friction discs and by a splined connection with said second driven shaft A2.

The outlet disc holder 23 generally has an "L" shape, the inner radial end of which is secured to a grooved outlet hub.

The torque transmission device 1 further comprises a main hub 7 of axis of rotation O, an external disc holder 14 of the first clutch E1 and an internal disc holder 24 of the second clutch E2, also called disc holder torque entry.

The external 14 and internal 24 disc holders are fixedly connected by welding to the main hub 7. In the example considered, a balancing cover is fixed integrally to the external disc holder 14 of the first clutch E1 and an internal disc holder 24 of the second clutch E2.

The torque entry disc holders 14, 24 together form a common disc holder 8 for the first and second clutch.

As illustrated in FIGS. 1 and 2, the first clutch E1 is arranged radially above the second clutch E2.

Preferably, the first clutch E1 and the second clutch E2 are in the open state, also called "normally open", and are selectively actuated in operation by a control device (not shown) to pass from the open state to the 'closed state.

The wet double clutch mechanism is hydraulically controlled by a pressurized fluid, usually oil.

To selectively control the change of state of the first clutch E1 and of the second clutch E2 of the torque transmission device 1, the control device manages the supply of pressurized oil to the device 1. The control device is connected to the main hub 7 which has channels which are not visible on the section planes of FIGS. 1 and 2.

The oil supply channels consist of substantially radial holes directed towards the control chambers and the balancing chambers of the first and second clutches E1, E2.

The first clutch E1 of the multi-disc type comprises a piston 40 which is axially movable, here from front to rear, between a disengaged position and a engaged position which correspond respectively to the open and closed states of the first clutch E1.

Advantageously, the piston 40 comprises, at its external radial end, supports 61 which extend axially towards the rear. The supports 61 come to bear on the end plate 11 of the multidisk assembly of the first clutch E1. In the example shown in Figure 1, the supports 61 are discontinuous.

The piston control chamber 32 of the first clutch E1 40 is associated with a balancing chamber 34 delimited by a part of the main hub 7 and a part of the balancing cover 30.

The piston 40 of the first clutch E1 extends radially and is disposed axially between the control chamber 32, located axially at the front, and the balancing chamber 34, located axially at the rear.

The piston 40 is controlled to tighten axially, in the engaged position, said multi-disc assembly of the first clutch E1 against reaction means 18 formed directly in the web 3 of entry.

The first clutch E1 comprises elastic return means for automatically returning the piston 40 to the disengaged position, corresponding to an open state of the clutch. In this position, the piston 40 axially releases the multidisk assembly which then no longer transmits torque towards the first driven A1 shaft.

As illustrated in FIG. 1, the elastic return means of the piston 40 are formed by a plurality of helical springs interposed axially between a front wall of the main hub 7 and said piston 40.

The second clutch E2 of the torque transmission device 1 is similar in design to that of the first clutch E1, the second clutch E2 being of the multi-disc type.

Advantageously, reference will be made, if necessary, to the description of the second clutch E2 in the detailed description of the first clutch E1 given previously.

The second clutch E2 comprises a piston 50 which is axially movable, here from the rear to the front, between a disengaged position and a engaged position corresponding respectively to the open and closed states of the second clutch E2.

The piston 40 of the first clutch E1 and the piston 50 of the second clutch E2 of said torque transmission device 1 move axially in the opposite direction to pass, for example, from the disengaged position to the engaged position.

Advantageously, the piston 50 comprises, at its external radial end supports 51 which extend axially forwards. The supports 51 come to bear on the end flange of the multidisk assembly of the second clutch

E2. In the example shown in Figure 1, the supports 51 form a continuous crown.

As shown in FIG. 1, the piston 50 is controlled to move by means of a control chamber 36 delimited axially by a rear face of an internal radial part of the piston 50 and by a front radial face of a piece of closure 39.

The piston control chamber 36 of the first clutch E2 50 is associated with a balancing chamber 38 delimited at least by a balancing cover 35.

The piston 50 of the second clutch E2 extends radially and is arranged axially between the control chamber 36, located axially at the rear, and the balancing chamber 38, located axially at the front. The piston 50 is concentric with the assembled disc holder 10.

The piston 50 is controlled to axially tighten, in the engaged position, said multidisk assembly of the second clutch E2 against reaction means 28. The reaction means 28 are formed directly on the internal periphery of the external disc holder 14 of the first clutch E1 .

The balancing cover 35 has stamped shapes angularly distributed around the axis O, forming an oil passage between the balancing chamber 38 and the interior of the second clutch E2 and allows the oil circulation necessary to balancing the pressures between the control chamber 36 and the balancing chamber 38.

In the example considered, the device 1 also comprises three axial bearings 51, 52, 53. The axial bearing 51 is interposed axially between the hub 4 of the torque input element 2 and the disc support 13 defining the clutch output port E1.

The axial bearing 52 is axially interposed between the disc support 13 defining the clutch output disc holder E1 and the disc support 23 defining the clutch output disc holder E2.

Finally, the axial bearing 53 is interposed between the disc support 23 defining the clutch output disc holder E2 and the main hub 7.

Advantageously, the axial bearings 51, 52, 53 are rolling bearings with a first and second disc between which a plurality of rolling bodies is disposed.

The device 1 also comprises a cylindrical hub 41 with an axis of rotation O. The cylindrical hub 41 and the disc support 23 are fixed together, preferably by laser welding by transparency, friction or discharge of the capacitor.

The torque transmission device 1 also comprises a plug 80 intended to seal said device 1, an adjustment shim 16 and a circlip 17. The adjustment shim 16 and the circlip 17 being disposed axially between the plug 80 and the cylindrical hub 41.

The plug 80 will now be further described with the aid of FIGS. 1 to

4.

Advantageously, the plug is independent of the torque input element 2. In other words the plug 80 and the torque input element are 2 separate pieces from each other. These two parts can thus be delivered separately to the customer.

Advantageously, the plug 80 is linked in rotation and in translation to the hub 4 by a thread. The thread can be of conical type as shown in FIGS. 1 and 2 or of cylindrical type as shown in FIG. 3.

Advantageously, the plug 80 comprises:

a radially internal annular part 81 intended to support a part linked to the motor, and a radially external annular part 83 in contact with the hub 4.

In the examples considered, the conical or cylindrical thread is produced between the hub 4 and the radially external annular part 83.

The plug 80 further comprises a seal 84 disposed on said radially outer annular portion 83. The seal 84 is radially disposed between the radially outer portion 83 of the plug and the hub 4.

In the examples considered, the radially internal and external annular parts 81, 83 of the plug 80 are coaxial.

Advantageously, the hub 4 comprises an internal face 4a and an external face 4b. The radially external annular part 83 being in contact with the internal face 4a of the hub 4.

According to the first embodiment of the invention (Figures 1 and 2), the radially outer annular part 83 and the inner face 4a of the hub 4 are of conical shape so as to form a conical fitting. This type of fitting makes it possible both to obtain very good centering and at the same time to allow the stop in axial translation of the plug 80.

Alternatively, as shown in Figures 3 and 4, according to a second embodiment of the invention, the cap 80 further comprises a stop means in axial translation 82, preferably a stop. The stop 82 is located axially on the heat engine side with respect to the gasket 84.

We will now describe with the aid of Figures 4a - 4g, the manufacture of a torque transmission device 1 according to the present invention.

In the example considered, the method comprises the following steps:

1) supply of a housing (shown in Figure 4a);

2) supply of a device 1 comprising a torque input element 2, a cylindrical hub 41 and a first wet clutch E1 of the multidisk type controlled to selectively couple a shaft leading to a first driven shaft A1 (represented in FIG. 4b) ;

3) installation of the torque transmission device 1 on the casing 90 (shown in FIG. 4c);

4) fitting the adjusting shim 16 on the cylindrical hub 41 (shown in FIG. 4d);

5) fitting of the circlip 17 on the adjustment shim 16 (shown in FIG. 4e);

6) fitting a plug 80 on said device 1, (shown in FIG. 4f) said plug 80 being independent of the torque input element 2 and comprising:

a radially internal annular part 81 intended to support a part linked to the motor, and a radially external annular part 83 in contact with the hub 4 of the torque input element 2

7) fitting of the part linked to the engine such as a double damping flywheel 91 (shown in FIG. 4g).

Advantageously, the fitting of the plug on the device 1, in particular on the hub 4, is carried out via a thread.

The invention is not limited to the exemplary embodiments which have just been described. The torque transmission device according to the invention may include a cut-out clutch, of the KO type, used in hybrid transmissions to couple the heat engine to the electric motor after the vehicle has started up.

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 (O) comprising an axial orientation part formed by a hub (4), said element being capable of being coupled in rotation to a driving shaft, a hub cylindrical (41) a first wet clutch (E1) of the multidisk type, controlled to selectively couple a shaft leading to a first driven shaft (A1) and a plug (80) intended to seal said device (1), characterized in that said plug (80) is independent of the torque input element (2) and comprises: a radially internal annular part (81) intended to support a part linked to the motor, and a radially external annular part (83) in contact with the hub (4). 2. Device (1) for transmitting torque according to claim 1, characterized in that said plug (80) further comprises a seal (84) disposed on said radially external annular part (83). 3. Device (1) for transmitting torque according to claim 1 or 2, characterized in that said plug (80) further comprises a stop means in axial translation (82), preferably a stop. 4. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that the radially external annular part (83) and an internal face (4a) of the hub (4) are of conical shape so as to form a conical fitting. 5. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that the radially internal and external annular parts (81, 83) of the plug (80) are coaxial. 6. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that it further comprises a second wet clutch (E2) of the multidisk type, controlled to selectively couple a shaft leading to a second shaft driven (A2), the first and second clutches (E1, E2) being arranged radially one above the other, the second driven shaft (A2) being arranged in parallel with the first driven shaft (A1) in the sense of torque transmission. 7. Device (1) for transmitting torque according to the preceding claim, characterized in that each of the multi-plate clutches (E1, E2) has flanges (11, 21) linked in rotation to a torque input disc holder ( 14, 24) and friction discs (12, 22) linked in rotation to a torque output disc holder (44, 54). 8. Device (1) for transmitting torque according to the preceding claim, characterized in that the torque input disc carriers (14, 24) together form a common disc carrier (8) at the first and second clutch. 9. Device (1) for transmitting torque according to any one of the preceding claims, characterized in that an adjustment shim (16) and a circlip (17) are arranged axially between the plug (80) and the cylindrical hub (41). 10. Method for manufacturing a torque transmission device (1) according to the preceding claim, comprising at least the following steps: supply of a device (1) comprising a torque input element (2), a cylindrical hub (41) and a first wet clutch (E1) of the multidisk type controlled to selectively couple a drive shaft to a first driven shaft ( A1), fitting the adjusting shim (16) on the cylindrical hub (41), fitting the circlip (17) on the adjusting shim (16), and fitting the plug (80) on said device (1) so in making it watertight, said plug (80) being independent of the torque input element (2) and comprising: a radially internal annular part (81) intended to support a part linked to the motor, and a radially external annular part (83) in contact with the hub (4) of the torque input element (2) .