FR3023886A1 - TRANSMISSION MODULE, IN PARTICULAR FOR A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a torque limiter (2) for a motor vehicle chain: - arranged to be mounted on a flywheel (11) of the transmission chain, - comprising a drive plate (14) and a rear cover (13b) - an elastic member (19), in particular an elastic washer, for example a Belleville washer, interposed between this plate (14) and the rear cover (13b) - a friction (15) bearing on the plate ( 14).

Description

The present invention relates to a transmission module, in particular for a motor vehicle transmission chain.

US Pat. No. 4,791,829 discloses a device for filtering vibrations with moving mass, with a beater. Patent application FR 2 899 661 discloses a torque limiter comprising a metal plate forming a flexible flywheel, intended to be fixed. on a driving shaft such as an internal combustion engine crankshaft. This torque limiter is interposed between a driving shaft and a driven shaft so as to limit the torque transmitted by an internal combustion engine to a non-disengageable transmission such as an automatic transmission or a continuous variable transmission. This torque limiter comprises a friction pinch between two support plates under the effect of elastic means, this nip being tared so that when the torque exerted by the driving shaft exceeds a predetermined threshold, the friction can slide between the two support plates and thus dissipate by friction the excess torque exerted by the driving shaft, thereby avoiding the ruin of the bodies located downstream of the driven shaft.

The invention aims to improve this type of device. The invention thus particularly relates to a transmission module, in particular for a motor vehicle transmission chain, comprising: a torque limiter, in particular arranged to be mounted on a single flywheel of the transmission chain, a filtering device The invention particularly makes it possible, because of the possibility of putting the torque limiter and the filtering device side by side, to have a module with a moving mass, in particular a pendulum or beater. compact, compact, and performs several functions. The mobile mass vibration filtering device may for example comprise an annular support intended to be rotated about its axis and pendular masses mounted at the outer periphery including the support. Each mass is animated by a pendulum movement in operation and may for example comprise two parts, mounted axially on either side of the support and interconnected by spacers each passing through an opening of the support. A roller may be mounted between a raceway formed in each spacer and the edge of the corresponding opening of the support. In response to rotational irregularities or acyclisms, each mass moves in such a way that its center of gravity oscillates in a pendulum fashion. Preferably, the filter device is mounted on the torque limiter so as to form a pre-mounted module. This simplifies the mounting of the module in the transmission chain.

Advantageously, the torque limiter and the filtering device are assembled together. Preferably, the filtering device is centered on the torque limiter, which allows precise centering of the various elements. This can advantageously allow the holding of the centering force of the pendulum is centered on the cover via a flywheel. It may be advantageous for the centrifugation force of the filtration device to be resumed by centering on the torque limiter and not on a friction hub. According to an exemplary embodiment of the invention, the filtering device is rotated with the torque limiter.

Where appropriate, the torque limiter comprises a friction capable of sliding in the event of overtorque applied to the torque limiter, and the filtering device is arranged to follow this sliding movement, in particular the pendular filtering device being driven by a hub of torque. friction. Preferably, the torque limiter comprises a drive plate and a cover assembled with this plate, and the plate and the cover are arranged to slide, in particular in rotation, with respect to the friction in case of over-torque applied to the limiter.

Advantageously, the filtering device is arranged to slide relative to the cover of the torque limiter in case of overtorque applied to the limiter. In an exemplary implementation of the invention, the filtering device is carried by the cover of the torque limiter.

If desired, the filtering device is arranged to be able to move axially relative to the cover according to the wear of the friction and the swiveling of the friction hub. This allows in particular that, whatever the wear of the friction, the pendulum filters via the friction hub.

According to an exemplary embodiment of the invention, the torque limiter comprises a friction hub and the filtering device is assembled with the friction hub via an elastic member, in particular an elastic washer. For example, the elastic member comprises at least one peripheral branch, in particular a plurality of peripheral branches, in particular arranged in a regular angular pitch, arranged to allow the axial displacement of the filtering device with respect to the cover and preferably also a slight displacement of "swivel type".

Where appropriate, the elastic member comprises a central opening arranged for mounting this member on the friction hub, in particular by pegging. The module according to the invention may comprise a drive member, in particular of substantially annular shape, assembled, in particular by means of rivets, with the elastic member in rotation, and making it possible to transmit a rotation of the friction hub towards the filtering device. In an exemplary embodiment of the invention, the drive member comprises fastening lugs arranged for fastening branches of the elastic member on these tabs, these lugs extending in particular radially inwardly of the driving member, preferably in a central opening of this drive member. If desired, once assembled together, the drive member and the resilient member form between them recesses, in particular regularly distributed around the axis of the module. Preferably, the elastic member is mounted on the drive member, on the side of the drive member facing the torque limiter.

Advantageously, the drive member comprises, in particular on an outer periphery, fixing tongues for fixing it to the filtering device. In an exemplary embodiment of the invention, the movable mass support of the filtering device comprises at least one orifice, in particular a plurality of orifices, arranged to receive a fastening tab of the drive member. Where appropriate, the module comprises a centering element arranged to allow the centering of the filtering device relative to the torque limiter.

The centering member may be arranged to be mounted on the cover of the torque limiter.

For example, the lid has a radially inner annular flange and the centering member is arranged to be placed around this annular flange. The centering member may comprise, on the one hand, a substantially flat collar coming to bear against a shoulder of the cover of the torque limiter and, on the other hand, a cylindrical wall coming to bear against the annular rim of the cover . Where appropriate, the annular rim of the cover comprises a terminal return extending the annular flange to axially immobilize the centering member. The centering member may for example be made of plastic. The filtering device advantageously comprises a movable mass support and this support is centered on the cover of the torque limiter. In an exemplary implementation of the invention, the support of the filtering device comprises a central opening through which at least partially extends the centering member. If desired, the support of the filtering device comprises a slice adjacent to this central opening and this slice bears on the centering member. The drive member may comprise an annular groove in which at least partially extend the centering member and the annular flange of the cover.

In an exemplary implementation of the invention, the centering member and the drive member are arranged to press the support of the pendular device against the cover of the torque limiter. If desired, the filtering device extends on only one side of the torque limiter, in particular on the side facing a flywheel.

The filtering device preferably extends outside the torque limiter. If necessary, the filtering device has an outer diameter smaller than the outer diameter of the cover of the torque limiter. The torque limiter advantageously comprises a drive plate and a rear cover, this torque limiter comprising an elastic member, in particular an elastic washer, for example a Belleville washer, interposed between this plate and the rear cover.

The elastic member, if any, is supported on a face of the plate opposite to the face of this plate on which the friction is based. In an exemplary implementation of the invention, the torque limiter has two friction linings applied against two opposite faces of a disk.

The torque limiter is in particular arranged to be connected to a single flywheel. The torque limiter advantageously comprises damping elements housed inside the torque limiter, these damping elements comprising in particular springs.

The invention also relates to a motor vehicle chain comprising a module as described above. The invention also relates to a method of mounting a module as described above, the method comprising the following step: - assembling together the torque limiter and the moving-mass vibration filtering device, - mounting the module thus assembled with a flywheel. The invention also relates to a torque limiter for a motor vehicle chain: - arranged to be mounted on a flywheel of the transmission chain, - comprising a drive plate and a rear cover - an elastic member, in particular an elastic washer, for example a Belleville washer, interposed between this plate and the rear cover, directly on the rear cover, without intermediate piece such a washer, - a friction resting on the plate. The invention will be better understood and other details, features and advantages of the invention will become apparent on reading the following description given by way of non-limiting example with reference to the accompanying drawings, in which: FIG. 1 is a view in perspective, the various elements of a transmission module according to an exemplary embodiment of the invention, - Figure 2 is a view along the axis of rotation of the device of Figure 1, and - Figure 3 shows, schematically and partially in section, the module of Figure 1. is shown in Figure 1 a transmission module 1 for a motor vehicle chain, comprising: a torque limiter 2 arranged to be mounted on a flywheel simple transmission chain, a vibration filter device 3 pendular mobile mass associated with the torque limiter.

The device 3 for vibrating mass filtering comprises, in the example described, an annular support 5 intended to be rotated about its axis X and pendular masses 6 mounted at the outer periphery of the support 5. Each mass 6 is driven in a pendulum operation and comprises two parts 7, mounted axially on either side of the support 5 and interconnected by spacers 8 each passing through an opening 9 of the support 5. A roller can be mounted between a track of rolling arranged in each spacer 8 and the edge of the corresponding opening 9 of the support. In response to rotational irregularities or acyclisms, each mass 6 moves so that its center of gravity oscillates in a pendular fashion. Of course, it is not beyond the scope of the present invention when the pendulum masses 6 are replaced by drummer masses such as those described in the patent 4,791,829.

As can be seen in Figures 1 and 3 in particular, the torque limiter 2 is connected to a single flywheel 11, intended to be fixed on a drive shaft such as a crankshaft of internal combustion engine. Fixing means such as hollow-head screws 12 are used to fix the flywheel 11 on the crankshaft. On the flywheel 11 is fixed a cover 13 inside which is placed a drive plate 14 axially slidable along the axis X and rotatably connected to the cover 13. Between this plate 14 and the front cover 13a of the cover 13 is interposed friction 15. In a manner known per se, the friction 15 comprises two friction linings 17 disposed on either side of a disc 18. The torque limiter comprises a Belleville washer 19 interposed between the plate 14 and the rear cover 13b.

This washer 19 is prestressed so as to permanently exert a calibrated pressure force on the plate 14, allowing pinching of the fittings 17 between the plate 14 and the front cover 13a. The torque limiter 2 comprises, as is known per se, elements for damping the acyclisms transmitted by the crankshaft.

These damping elements comprise two guide washers 23, 25 between which extends a damping web 27 itself integral with a friction hub 30 adapted to drive a driven shaft. Between the two guide rings 23 and 25 are arranged a plurality of springs or group of springs 31, cooperating with the damping web 27. For further details of the construction of the torque limiter 2, it is possible to refer for example at the patent application FR 2 899 661.

In the example described, the filtering device 3 is mounted on the torque limiter 2 so as to form a pre-assembled module. The torque limiter 2 and the filtering device 3 are assembled together, as will be seen below. The filtering device 3 is centered on the torque limiter 2, which allows precise centering of the various elements. The filtering device 3 is rotated with the torque limiter 2. The friction 15 of the torque limiter 2 is capable of sliding in the event of overtorque applied to the torque limiter 2, and the filtering device 3 is arranged to follow this sliding movement, in particular the pendular filtering device being driven by the friction hub 30. In the example described, the torque limiter 2 comprises the drive plate 14 and the lid 13 assembled with this plate, and the plate and the cover are arranged to slide, in particular in rotation, with respect to the friction 15 in the event of overtorque applied to the limiter 2. The filtering device 2 is carried by the cover 13 of the torque limiter 2. The filtering device 3 is arranged to be able to move axially with respect to the cover 13 as a function of the wear of the friction 15 and the swiveling of the friction hub. The torque limiter 2 comprises the friction hub 14 and the filtering device 3 is assembled with the friction hub 14 via a resilient member formed by an elastic washer 40, as can best be seen in FIG. 1. The elastic member 40 comprises a plurality of peripheral branches 41, arranged at a regular angular pitch around the axis X, arranged to allow the axial displacement of the filtering device 3 with respect to the cover 13. The elastic member 40 comprises a central opening 42 10 arranged for mounting this member on the friction hub 30, by pegging. The module 1 comprises a drive member 50 of substantially annular shape, assembled by means of rivets 51, with the elastic member 40, and making it possible to transmit a rotation of the friction hub 30 towards the filtering device 3. In this exemplary embodiment of the invention, the drive member 50 comprises fastening lugs 53 arranged for fixing branches 41 of the elastic member 40 on these lugs 53, these lugs 53 extending radially towards the lug inside the drive member 50, in a central opening 54 of this drive member. Once assembled together, the drive member 50 and the elastic member 40 form between them recesses 55, regularly distributed around the axis X of the module, as can be seen in Figure 2 in particular.

The elastic member 40 is mounted on the drive member 50, on the side of the drive member facing the torque limiter 2. The drive member 50 has, on an outer periphery 56, tabs fixing device 57 for fixing it on the filtering device 3.

The movable mass support 5 of the filtering device 3 comprises a plurality of orifices 60 arranged to each receive a fastening tab 57 of the drive member 50, as can be seen for example in FIG. 1 comprises a centering member 70 arranged to allow the centering of the filtering device 3 relative to the torque limiter 2. The centering member 70 is arranged to be mounted on the cover 13 of the torque limiter 2. The front cover 13a has an annular rim 71 radially inner and the centering member 70 is arranged to be placed around this annular flange 71. The centering member 70 comprises, on the one hand, a substantially flat flange 73 coming to bear against a shoulder 74 of the cover 13 of the torque limiter 2 and, secondly, a cylindrical wall 75 coming to bear against the annular flange 76 of the cover.

The annular flange 76 of the cover comprises a terminal return 77 extending the annular flange to axially immobilize the centering member 70. In the example described, the centering member 70 is made of plastic.

The support 5 is thus centered on the cover 13 of the torque limiter 2. The support 5 of the filtering device 3 comprises a central opening 79 through which the centering member 70 extends. This support 5 of the filtering device comprises a wafer 80 adjacent to this central opening 79 and this wafer 80 bears on the centering member 70, as can be seen in FIG. 3. The drive member 50 comprises an annular groove 81 in which at least partially extend the centering member 70 and the annular rim 71 of the cover.

The centering member 70 and the drive member 50 are arranged to press the support 5 of the pendular device 3 against the cover 13 of the torque limiter 2. The filtering device 3 extends on one side only of the torque limiter 2 on the side facing a flywheel 11. The filter device 3 extends outside the torque limiter 2. The filter device 3 has an outside diameter smaller than the outside diameter of the cover 13 of the limiter of the couple.10

Claims (4)

REVENDICATIONS1. Torque limiter (2) for a motor vehicle chain: - arranged to be mounted on a flywheel (11) of the transmission chain, - comprising a drive plate (14) and a rear cover (13b) an elastic member (19), in particular an elastic washer, for example a Belleville washer, interposed between this plate (14) and the rear cover (13b), directly on this rear cover, a friction resting on the plate (14) . 2. Limiter according to the preceding claim, characterized in that the fact that the torque limiter comprises two friction linings 20 (17) applying against two opposite faces of a disc (18). 3. Limiter according to one of the preceding claims, characterized in that the elastic member is supported on a face of the plate opposite to the face of the drive plate (14) on which 25 relies friction ( 15). 4. Limiter according to one of the preceding claims, characterized in that the friction (15) is capable of sliding in case of over torque applied to the torque limiter.