FR3032762A1 - TORQUE TRANSMISSION ASSEMBLY, IN PARTICULAR FOR MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a torque transmission assembly comprising a clutch device (1) comprising at least one reaction plate (3), a first and a second friction disc (4, 11) for coupling respectively to a first and second driven shafts, first and second pressure plates (2, 10), respectively actuated by a first and a second diaphragm (7, 12) so as to clamp or release the first and second friction discs; (4, 11) on the reaction plate (3), a first cover (5), fixed with respect to the reaction plate (3), the first pressure plate (2) being fixedly connected to a second cover (6) , movable in translation relative to the reaction plate (3), the torque transmission assembly further comprising a connecting plate (18), coupled in rotation with respect to the first cover (5) and with respect to the reaction plate (3), said connecting plate (18) being intended to be coupled in rotation to a torque damping device, such as for example a double damping flywheel (14), pendular damping means (25, 26, 27) comprising at least one movable mass (25). The mass (25) of the pendular damping means (25, 26, 27) is movably mounted directly on the connecting plate (18), and / or on the first cover (5), and / or on the second cover (6).

Description

The present invention relates to a transmission assembly, in particular for a motor vehicle. Such an assembly conventionally comprises a clutch device of the double clutch type, as well as a damping device of the double damping flywheel type. Patent application WO 2013/088043 discloses a double clutch for coupling the shaft of a motor of a vehicle alternately with two coaxial input shafts of a gearbox, which can be robotized. Thus, a double clutch makes it possible to change gear ratios while maintaining the transmission of engine torque to the wheels of the vehicle. Indeed, the two clutch mechanisms are associated with odd and even gear ratios, respectively. During a gearshift, a first clutch mechanism is disengaged while the second clutch mechanism is engaged, so that the engine torque is progressively transferred from the first to the second clutch mechanism. Each clutch mechanism comprises a diaphragm intended to cooperate with a pressure plate integral in rotation with a cover and the motor shaft. Each diaphragm is movable by means of a corresponding clutch abutment between a rest position and an active position. Depending on the type of clutch, the active position of the diaphragm corresponds to a coupling or decoupling of the shafts of the engine and the gearbox and the rest position of the diaphragm corresponds to a decoupling or a coupling of these shafts. These are respectively a normally open clutch and a normally closed clutch. The clutch abutment is controlled by an actuator controlled by an electronic computer to exert a predetermined force on the diaphragm and to move it over a given distance. The pressure plate of each clutch mechanism, urged by the corresponding diaphragm, is for clamping a friction disc to a corresponding reaction plate. A reaction plate may be provided for each clutch mechanism. Alternatively, a single reaction plate common to both clutches, mounted between the two friction discs, is used.

Each friction disk is rotatably connected to an input shaft of the gearbox and each reaction plate is rotatably connected to a flywheel connected to the drive shaft. Thus, the clamping of a friction disk between the corresponding pressure and reaction plates allows the transmission of a torque between the drive shaft and the shaft of the associated gearbox. The dual-flywheel type damping device comprises a primary mass or flywheel, a secondary flywheel mass or flywheel comprising an annular sail, and circumferential action springs mounted between the primary mass of inertia and the annular veil. A connecting plate conventionally allows to couple in rotation the annular web and the reaction plate of the double clutch. The annular web, said connecting plate and the reaction plate thus belonging to the secondary flywheel.

An internal combustion engine generates acyclisms because of the successive explosions in the cylinders of the engine, these acyclisms varying in particular as a function of the number of cylinders. The damping device is generally equipped with friction elements which, in combination with the circumferential action springs, make it possible to filter the vibrations due to the rotational acyclisms of the motor. This prevents such vibrations pass in the gearbox and cause shocks, noises and unwanted noise. In order to further improve the filtration, it is known to use a pendulum damping device, in addition to the usual damping system. The patent application FR 2 981 714, in the name of the Applicant, discloses a pendular damping device comprising an annular support intended to be rotated about its axis and pendular masses mounted at the outer periphery of the support. Each mass is driven in a pendulum movement in operation and comprises two parts, mounted axially on either side of the support and connected by three spacers each through an opening of the support. A roller is mounted between a raceway formed in each spacer and the edge of the corresponding opening 15 of the support. The spacers are attached to both parts of the mass by riveting. The heads of the rivets are supported on the outer radial faces of the parts of the mass, that is to say on the opposite sides to the annular support. The spacers and the rollers are all located in the same radial plane.

In response to rotational irregularities or acyclisms, each mass moves in such a way that its center of gravity oscillates in a pendulum fashion. The oscillation frequency of each mass is proportional to the speed of rotation of the drive shaft, the corresponding multiple may for example take a value close to the rank of the overriding harmonic of the vibrations responsible for the large irregularities of rotation in the vicinity of the slow motion. The patent application DE 10 2009 042 836 proposes to mount such pendulum masses on a support which is fixed to the connecting plate ensuring the transmission of the torque from a double damping flywheel to a double clutch. Such a structure thus requires the use of a separate support, that is to say an additional piece compared to a conventional torque transmission assembly. Such a set is therefore more complex to manufacture and assemble, and has a relatively high cost. The object of the invention is in particular to provide a simple, effective and economical solution to this problem. For this purpose, it proposes a torque transmission assembly comprising a clutch device comprising: at least one reaction plate, a first and a second friction disk intended to be coupled respectively to a first and a second driven shaft, a first and a second pressure plate, respectively actuated by a first and a second diaphragm so as to clamp or release the first and second friction disc on the reaction plate, a first cover fixed by relative to the reaction plate, - the first pressure plate being fixedly connected to a second lid, movable in translation relative to the reaction plate, the torque transmission assembly further comprising: - a connecting plate, rotatably coupled with respect to the first cover and with respect to the reaction plate, said connecting plate being adapted to be rotatably coupled to a neck damping device ple, such for example a double damping flywheel, - pendular damping means comprising at least one movable mass, characterized in that the mass of the pendular damping means is movably mounted directly on the connecting plate , and / or on the first cover, and / or on the second cover. The invention thus makes it possible to integrate torque damping means 30 with a conventional structure of a torque transmission assembly, without adding any additional piece. This reduces the cost and complexity of such an assembly. The pendulum damping means can then be mounted alternately on the connecting plate, the first cover or the second cover. Also, the pendulum damping means can be mounted simultaneously on two or three of the structural components of the transmission assembly defined by the connecting plate, the first cover and the second cover. This improves the filtering capabilities of the torque transmission assembly. The clutch device may comprise a single reaction plate 10 disposed axially between the first and second friction discs. The torque transmission assembly may comprise a double damping flywheel type damping device comprising a primary mass of inertia, an annular web and circumferentially acting damping means mounted between the mass of inertia. primary and the annular web, the connecting plate being rotatably coupled to the annular web. Preferably, the mass of the pendular damping means may be movably mounted at the radially outer periphery of the connecting plate, the first cover and / or the second cover. The mass is thus located on a relatively large implantation radius, which makes it possible to improve the efficiency of the filtration. It is recalled that the efficiency of the filtration increases with the mass (and therefore the volume) of the mobile mass and / or with its implantation radius.

According to one embodiment of the invention, the first lid, respectively the second lid, may comprise tabs formed integrally with the first lid, respectively with the second lid, said tabs extending radially outwardly, mass pendular damping means being movably mounted on said tabs.

In particular, the second lid may comprise axially extending connecting parts and fixed to the first pressure plate, the first lid having lugs integrally formed with said first lid and used for mounting the mass of the means 5 of the invention. pendular damping, said tabs extending circumferentially between the connecting portions of the second cover. Each mass may comprise two parts located axially facing one another. The pendular damping means may then comprise at least one axially extending spacer, fixedly mounted between the two parts of the mass, the radially outer periphery of the spacer forming at least one raceway for rolling means. such as for example a roller, the connecting plate, the first cover or the second cover having at least one oblong opening through which the spacer passes, the radially outer edge of said opening forming a raceway for the rolling means . The connecting plate may comprise splines engaged in complementary splines of the annular web so as to ensure the rotational coupling of said connecting plate and the annular web. In addition, the transmission assembly may comprise a play-catching element movably mounted on the connecting plate or on the annular web, between a first position in which it exerts no stress on the connecting plate or on the annular web and a second position in which it constrains the splines of the annular web or the connecting plate against the complementary splines of the connecting plate or the annular web, - resilient biasing means biasing the catch-up element of play to its second position, and 30 - movable locking means between a locking position, in which they immobilize the game-catching element 3032762 7 in its first position, and an unlocking position in which they release the element catching game which can then move to its second position, the locking means being able to be moved to their positio releasing by relative rotation of the annular web 5 with respect to the connecting plate in a case of driving the annular web by the connecting plate. The torque transmission assembly may comprise: first oscillatory damping means for filtering a first order value of the torsional oscillations, and second pendular damping means for filtering a second value of order of torsional oscillations, different from the first order value. The invention also relates to a motor vehicle comprising a device of the aforementioned type.

The invention will be better understood and other details, characteristics and advantages of the invention will become apparent on reading the following description given by way of non-limiting example with reference to the appended drawings, in which: FIGS. 1 to 5 FIG. 1 is an axial sectional view of a torque transmission assembly according to the first embodiment; FIG. 2 is a perspective view of a first embodiment of the invention, and FIG. a part of said assembly, in particular of the clutch device, the connecting plate 25 and the pendular damping means, - Figure 3 is a perspective view of the connecting plate, the pendular damping means, of the play-catching element, elastic return means and associated locking means, FIG. 4 is a front view of the various elements of FIG. 3, FIG. 5 is a view in the neck. 4 is a perspective view of a torque transmission assembly according second embodiment, - Figure 7 is a perspective view of a part of said assembly, in particular of the clutch device and the pendular damping means, - Figure 8 is a front view of the second cover and pendular damping means; FIG. 9 is an axial sectional view along the line IX-IX of FIG. 8; FIG. 10 is a perspective view of the second cover and pendular damping means; - Figure 11 is a schematic half-view, in axial section, of a transmission assembly according to a third embodiment. Figures 1 to 6 illustrate a torque transmission assembly according to a first embodiment of the invention for coupling a motor with a first and a second input shaft of a gearbox. This assembly comprises a clutch device 1 of the double clutch type, comprising first and second clutch mechanisms allowing the passage of ratios of different parities.

The first clutch mechanism comprises a first pressure plate 2 and a reaction plate 3 between which a first friction disc 4 extends. The first pressure plate 2 is rotatably coupled to the reaction plate 3 and is translatable. relative thereto, between an engaged position and a disengaged position, in which it squeezes the first friction disc 4 on the reaction plate 3, respectively releases the first friction disc 4.

The reaction plate 3 is fixed on a first cover 5 coupled to the motor shaft. The first friction disc 4 is coupled to the first input shaft of the gearbox. Thus, in the engaged position of the first clutch mechanism, the motor shaft is coupled to the first input shaft of the gearbox. The first pressure plate 2 is fixed on a second cover 6, movable in translation relative to the reaction plate 3 and the first cover 5, and extending forwardly. A first diaphragm 7 is pivotally mounted on the first cover 5, by means of rivets 8 10 ensuring the positioning and centering of said diaphragm 7 while allowing it to tilt. The first diaphragm 7 is in the form of an elastic annular sheet. The control of the first clutch mechanism is conventionally carried out by means of a first clutch abutment (not shown) cooperating with the radially inner periphery of the first diaphragm 7. The first diaphragm 7 forms a lever transmitting the force applied by the first abutment at the first pressure plate 2, via the second cover 6. The first clutch mechanism is of the normally open type. The rest position of the first diaphragm 7 thus corresponds to a disengaged state of the first clutch mechanism. The diaphragm 7 preferably has a portion of the Belleville washer type for returning the diaphragm 7 to its rest position. In the rest position of the first diaphragm 7, that is to say when the first clutch abutment exerts a slight force on the first diaphragm 7, the first diaphragm 7 thus exerts a zero or low force on the first plate of pressure 2. The first pressure plate 2 is spaced from the reaction plate 3 by means of appropriate rappelling means, such as elastic tongues 9, so as to release the first friction disc 4. In said storage position or transport, the first diaphragm 7 is not biased by the first clutch abutment.

The second clutch mechanism comprises a second pressure plate 10 and a second friction disc 11 extending radially between the reaction plate 3 and the second pressure plate 10. The same reaction plate 3 is thus used to the two clutch mechanisms, each friction disc 4, 11 being disposed on the side of one of the two radial bearing surfaces of the reaction plate 3. The second pressure plate 10 is rotatably coupled to the reaction plate 3 and is movable in translation relative thereto, between an engaged position and a disengaged position, in which it squeezes the second friction disk 11 on the reaction plate 3, respectively releases the second friction disk 11. The second friction disc 11 is coupled to the second input shaft of the gearbox. Thus, in the engaged position of the second clutch mechanism, the motor shaft is coupled to the second input shaft of the gearbox. A second diaphragm 12 is pivotally mounted on the first cover 5, by means of rivets ensuring the centering of said diaphragm 12 while allowing it to tilt. The second diaphragm 12 is, as before, in the form of an annular elastic sheet 20. The control of the second clutch mechanism is conventionally effected by means of a second clutch abutment cooperating with the radially inner periphery of the second diaphragm 12. The second diaphragm 12 forms a lever transmitting the force applied by the second clutch abutment second pressure plate 10, to allow effective clamping of the second friction disc 11. The second clutch mechanism is also of the normally open type. In the rest position of the second diaphragm 12, that is to say when the second clutch abutment exerts a zero or low force on the second diaphragm 12, the second diaphragm 12 exerts a zero or low force on the second plate The second pressure plate 10 is moved away from the reaction plate 3 by means of appropriate return means, such as resilient tongues 13, so as to release the second friction disc 11. the torque transmission further comprises a double damping flywheel type damping device 14 having a primary flywheel mass or flywheel 15, a secondary flywheel mass or flywheel comprising an annular sail 16, and springs. with circumferential action 17 mounted between the primary mass of inertia 15 and the annular web 16. A connecting plate 18 conventionally makes it possible to couple in rotation the annular web 16 and the reaction plate 3 of the 1. The rotational connection of the connecting plate 18 to the reaction plate 3 can be achieved by means of fastening rivets. The annular web 16, said connecting plate 18 and the reaction plate 3 thus belong to the secondary flywheel. An internal combustion engine generates acyclisms because of the successive explosions in the cylinders of the engine, these acyclisms varying in particular as a function of the number of cylinders. The damping device 14 is equipped with friction elements 19 which, in combination with the circumferential action springs 17, make it possible to filter the vibrations due to the rotational acyclisms of the motor. This prevents such vibrations pass into the gearbox and cause shock, noise and unwanted noise.

The connecting plate 18 has an annular shape and has grooves 20 at its radially inner periphery. The web 16 of the double damping flywheel 14 also has splines 21 (FIG. 1) at its radially inner periphery, the splines 20 of the web 16 being engaged loosely in the complementary splines 21 of the connection plate 18. An annular element of play catch 22 (Figures 3 to 5) is movably mounted on the connecting plate 18, between a first position in which it exerts no stress on the grooves 20, 21 (inactive position) and a second position in which it constrains the splines 20 of the annular web 16 against the splines 21 of the connecting plate 18 (active position).

The connecting plate 18 is also equipped with a locking element 23, distinct from the play-catching element 22 and movable between a locking position, in which it immobilizes the play-catching element 22 in its first position. position, and an unlocking position, in which it releases the play catch element 22 which can then move to its second position. Returning springs 24 are mounted between the locking element 23 and the play-catching element 22, these springs 24 exerting a circumferential action urging the play-catching element 22 towards its second position.

Unlocking of the locking element 23 is obtained by relative displacement between the locking element 23 and the play-catching element 22. Such an operation is known for example from the patent application FR 2 995 959, to the name of the Applicant. The torque transmission assembly further includes pendular damping means for further improving the filtration of rotational acyclisms. In the first embodiment shown in FIGS. 1 to 6, these pendular damping means comprise pendular masses mounted on the outer periphery of the connecting plate.

Each mass 25 is driven in a pendulum motion in operation and has two parts 25a, 25b, mounted axially on either side of the connecting plate 18 and connected by two spacers 26 each passing through an opening of the connecting plate. 18. A roller 27 (Fig. 5) is mounted between a raceway in each spacer 26 and the radially outer edge 28 of the corresponding opening of the connecting plate 18. The ends of the struts 26 are attached to the two parts 25a, 25b of the mass 25 by riveting. In response to rotational irregularities or acyclisms, each mass moves so that its center of gravity oscillates in a pendulum fashion. The oscillation frequency of each mass 25 is proportional to the speed of rotation of the drive shaft, the corresponding multiple may for example take a value close to the rank of the overriding harmonic of the vibrations responsible for the large irregularities of rotation in the vicinity of slow motion.

Thus, in this first embodiment, the pendulum masses 25 are mounted directly on the connecting plate 18, without the use of an intermediate support, as in the case of the document DE 10 2009 042 836. The structure of the assembly torque transmission is simplified.

FIGS. 6 to 10 show a second embodiment of the invention, which differs from that described above with reference to FIGS. 1 to 5 in that the pendulum masses 25 are mounted, not directly on the connecting plate 18, but directly on the second lid 6.

In particular, the second cover 6 is generally bell-shaped and comprises a radial annular portion 29 whose radially outer periphery is extended by a generally cylindrical annular portion 30 extending towards the first pressure plate. Connecting portions 31 extend radially from the free end of the cylindrical portion 30 towards the first pressure plate 2. The connecting portions 31 are spaced apart circumferentially relative to one another. The free ends of the connecting portions 31 are fixed by means of rivets 32 to the first pressure plate 2.

The second cover 6 further comprises tabs 33 extending radially outwardly from the cylindrical portion 30, 3032762 14 said tabs 33 extend circumferentially between the connecting portions 31. A pendulum mass 25 is mounted on each of the legs 33, here six in number. As before, each mass 25 comprises two parts 25a, 25b connected to each other by spacers 26 passing through corresponding openings in the tabs 33. Rollers 27 are mounted between the spacers 26 and the radially outer edges 28 said openings. In this second embodiment, the pendulum masses 25 are therefore mounted directly on the second cover 6, without the use of an intermediate support. FIG. 11 diagrammatically represents a third embodiment, which differs from those previously described in that the pendulum masses 25 are mounted directly on the first cover 5. In particular, the first cover 5 has a general bell shape and comprises a radial annular portion 34 whose radially outer periphery is extended by a generally cylindrical annular portion 35, extending towards the first pressure plate, itself extended by a radial annular flange 36, extending radially outwards . The flange 36 is fixed to the reaction plate 3 and to the connecting plate 18 by means of rivets. The first cover 5 further comprises tabs 37 extending radially outwardly from the cylindrical portion 35, said tabs 37 extending circumferentially in the spaces delimited between the connecting portions 31 of the second cover 6. As before, a pendulum mass 25 is mounted on each of the legs, for example six in number. Each mass 25 has two parts 25a, 25b connected to each other by spacers 26 through corresponding openings in the legs 3032762 37. 37 Rollers 27 are mounted between the spacers 26 and the radially outer edges 28 of said openings. In this third embodiment, the pendulum masses 25 are therefore mounted directly on the first cover 5, 5 without the use of an intermediate support. It is possible to imagine accumulating the pendulum damping means simultaneously on the connecting plate, the first cover and the second cover to improve the filtering capacity of the torque transmission assembly.

According to another embodiment, the pendular damping means can be tuned to different orders, by modifying the mass or the raceway so as to filter different stresses coming from the engine, particularly in the context of the deactivation of cylinders. of the motor. For example, the first 15 pendular damping means for filtering a first order value of the torsional oscillations can be mounted on one of the structural components of the transmission assembly defined by the connecting plate 3, the first cover 5 and the second cover 6 while the second pendulum damping means for filtering a second order value of the torsional oscillations, different from the first order value, can be mounted on one of the other two structural components of the torque transmission assembly. In this way, the filtering capacity of the torque transmission assembly is improved while reducing the cost and complexity of such an assembly.

Claims (11)

REVENDICATIONS1. A torque transmission assembly comprising a clutch device (1) comprising: - at least one reaction plate (3), - a first and a second friction disc (4, 11) for coupling to a first and a second friction disk (4, 11) respectively a second driven shaft; a first and a second pressure plate (2, 10), respectively actuated by a first and a second diaphragm (7, 12) so as to clamp or release the first and second friction discs; (4, 11) on the reaction plate (3), - a first lid (5), fixed with respect to the reaction plate (3), - the first pressure plate (2) being fixedly connected to a second lid (6), movable in translation relative to the reaction plate (3), the torque transmission assembly further comprising: - a connecting plate (18) rotatably coupled with respect to the first cover (5) and by to the reaction plate (3), said connecting plate (18) being intended to be coupled e in rotation to a torque damping device, such as for example a double damping flywheel (14), - pendular damping means (25, 26, 27) comprising at least one moving mass (25), 25 characterized in that the mass (25) of the pendular damping means (25, 26, 27) is movably mounted directly on the connecting plate (18), and / or on the first cover (5), and / or on the second lid (6). 2. Torque transmission assembly according to claim 1, characterized in that it comprises a double damping flywheel type damping device (14), 3032762 17 having a primary mass of inertia (15), a annular web (16) and circumferentially acting damping means (17) mounted between the primary inertial mass (15) and the annular web (16), the connecting plate (18) being rotatably coupled to the annular web (16). 3. torque transmission assembly according to claim 1 or 2, characterized in that the mass (25) of the pendular damping means (25, 26, 27) is mounted movably at the radially outer periphery of the connecting plate (18), the first cover (5) and / or the second cover (6). 4. Torque transmission assembly according to one of claims 1 to 3, characterized in that the first cover (5), respectively the second cover (6) has tabs (37, 33) formed integrally with the first cover (5), respectively with the second cover (6), said tabs (37, 33) extending radially outwards, the mass (25) of the pendular damping means (25, 26, 27) being mounted movably on said tabs (37, 33). A torque transmission assembly according to claim 4, characterized in that the second cover (6) has axially extending connecting portions (31) and attached to the first pressure plate (2), the first cover (5) ) having tabs (37) formed integrally with said first cover (5) and for mounting the mass (25) of the pendulum damping means (25, 26, 27), said tabs (37) extending circumferentially between the connecting portions (31) of the second cover (6). 6. torque transmission assembly according to one of claims 1 to 5, characterized in that each mass (25) of the pendular damping means (25, 26, 27) comprises two parts (25a, 25b) arranged axially in look at each other. 7. torque transmission assembly according to claim 6, characterized in that the pendulum damping means (25, 26, 27) comprise at least one spacer (26) 3032762 18 extending axially fixedly mounted between the two parts (25a, 25b) of each mass (25), the radially outer periphery of the spacer (26) forming at least one raceway for rolling means, such as for example a roller (27), link (18), the first cover (5) or the second cover (6) having at least one oblong opening through which the spacer (26) passes, the radially outer edge (28) of said opening forming a raceway for the rolling means (27). Torque transmission assembly according to one of Claims 2 to 7, characterized in that the connecting plate (18) has splines (20) engaged in complementary splines (21) of the annular web (16) of in order to ensure the rotational coupling of said connecting plate (18) and the annular web (16). 15 9. Torque transmission assembly according to one of claims 2 to 8, characterized in that it comprises a play catching element (22) movably mounted on the connecting plate (18) or on the annular web (16), between a first position in which it exerts no stress on the connecting plate (18) or on the annular web (16) and a second position in which it forces the splines (21, 20) of the veil annular (16) or the connecting plate (18) against the complementary splines (20, 21) of the connecting plate (18) or the annular web (16), - elastic return means (24) urging the a play-catching element (22) to its second position, and - locking means (23) movable between a locking position, in which they immobilize the play-catching element (22) in its first position, and an unlocking position in which they release the catch-up element from eu (22) which can then move to its second position, the locking means (23) being able to be moved to their unlocking position by relative rotation of the annular web (16) with respect to the connecting plate (18) in a case of driving the annular web (16) by the connecting plate (18). 10. Torque transmission assembly according to one of claims 1 to 9, characterized in that it comprises: - first damping means pendualire for filtering a first order value of the torsional oscillations, and - second pendulum damping means for filtering a second order value of the torsional oscillations, different from the first order value. 11. Motor vehicle comprising torque transmission assembly according to one of claims 1 to 10.