FR3058195A1 - FILTERING MECHANISM BETWEEN TWO ROTATING BODIES AND CLUTCHES EQUIPPED WITH SUCH A MECHANISM - Google Patents

Abstract

The invention relates, on the one hand; a filtering mechanism (X) for motor torque fluctuations around an axis of revolution (100) for a motor vehicle clutch (Y) comprising at least two members, respectively, a primary member (1) and a secondary member ( 2), rotating about the axis of revolution being able to oscillate angularly with respect to each other, an elastic potential energy accumulator (R1, R2) mounted between said members and means for locking said bodies temporarily blocking their relative angular oscillation, characterized in that said locking means comprise an actuator (A) capable of exerting axial forces (F1, F2) transmitted to at least one intermediate member (3) integral in rotation with the one of the primary (1) or secondary (2) bodies and carrying a stop element (33) engaging, under the action of said forces, with the other member to ensure their mutual blocking and, secondly; clutches equipped with said filtering mechanism; and a method of locking a filtering mechanism.

Description

© Publication number: 3,058,195 (to be used only for reproduction orders)

©) National registration number: 16 60477 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE

©) Int Cl ⁸ : F16 F15 / 131 (2017.01), F 16 F 15/133

A1 PATENT APPLICATION

©) Date of filing: 28.10.16. © Applicant (s): VALEO EMBRAYAGES Company by (30) Priority: simplified actions - FR. ©) Inventor (s): VERHOOG ROEL, BOULET JEROME and LEBAS GILLES. (43) Date of public availability of the request: 04.05.18 Bulletin 18/18. (56) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ©) Holder (s): VALEO EMBRAYAGES Company by related: simplified actions. ©) Extension request (s): ©) Agent (s): VALEO EMBRAYAGES Company by simplified actions.

(34) FILTERING MECHANISM BETWEEN TWO ROTATING ORGANS AND CLUTCHES EQUIPPED WITH SUCH A MECHANISM.

FR 3 058 195 - A1

The invention relates, on the one hand;

- a filtering mechanism (X) for fluctuations in the engine torque around an axis of revolution (100) for the clutch (Y) of a motor vehicle comprising at least two members, respectively, a primary member (1) and a secondary member ( 2), rotating around the axis of revolution being able to oscillate angularly with respect to each other, an elastic potential energy accumulator (R1, R2) mounted between said members and means for locking said members ensuring the temporary blocking of their relative angular oscillation, characterized in that said locking means comprise an actuator (A) capable of exerting axial forces (F1, F2) transmitted to at least one intermediate member (3) integral in rotation with the 'one of the primary (1) or secondary (2) members and carrying a stop element (33) engaging, under the action of said forces, with the other member to ensure their mutual blocking and, on the other hand;

- clutches fitted with said filtering mechanism and,

- a method of locking a filtering mechanism.

FILTERING MECHANISM BETWEEN TWO ROTATING ORGANS AND CLUTCHES EQUIPPED WITH SUCH A MECHANISM [0001] The invention relates to an improved filtering mechanism, to clutches equipped with such a mechanism and to a method for locking a mechanism of filtering.

More specifically, the invention relates to a filtering mechanism equipped with means for locking the damping double flywheel.

STATE OF THE PRIOR ART In order to attenuate the torque fluctuations between a heat engine and a gearbox, it is known to equip the clutches with a filtering mechanism with a double damping flywheel. This double flywheel generally comprises a primary torque input flywheel, rotating around an axis of revolution, and a secondary torque output flywheel, capable of oscillating angularly relative to the primary member in directions, respectively, direct and retrograde oscillation, between two end of travel positions and between which is interposed at least one potential energy accumulator with elastic compression.

However, these filtering mechanisms have a resonant frequency, in particular, in the starting and revving phases of the engine or below the idling speed before the vehicle stops. However, these phases cause significant shocks when the range of resonant frequencies is crossed.

Under these conditions, it has been important to block the damper of the filtering mechanism when the engine speed goes through these phases to avoid any relative angular displacement between the primary flywheel and the secondary flywheel.

A solution for blocking the double flywheel is described, in particular, in FR 2 822 210. In this solution, the blocking of the secondary flywheel is ensured by the displacement of the assembly consisting of the secondary flywheel and of the clutch. . The mass of these components being high, their displacement requires a complex guidance system and a return system capable of producing a significant effort.

In addition, the engagement of the locking system requires a high thrust force capable of compensating for the restoring force and rapidly displacing the mass of the secondary flywheel and of the clutch. This type of system therefore requires resorting to complex, heavy and costly means.

However, the technical solutions envisaged so far required the use of complex external means to temporarily secure the primary and secondary flywheels to each other.

PRESENTATION OF THE INVENTION The invention aims to remedy the drawbacks of the state of the art by seeking to suppress or at least significantly attenuate the resonance phenomena in order to avoid shocks and noises resulting and without causing disturbances in the behavior of the filtering mechanism outside the critical phases.

To this end, the invention provides an improvement of the mechanisms for filtering fluctuations in the engine torque around an axis of revolution for a motor vehicle clutch, comprising at least two members, respectively, a primary member and a secondary member , rotating around the axis of revolution being able to oscillate angularly with respect to each other, means for locking said members ensuring the temporary blocking of their relative angular oscillation and an elastic potential energy accumulator mounted between said members, characterized in that said locking means comprise an actuator capable of exerting axial traction or thrust forces transmitted to at least one intermediate member integral in rotation with one of the primary or secondary members and carrying a stop element coming into engagement, under the action of said forces, with the other member to ensure their mutual blocking.

According to an advantageous characteristic, the locking means are arranged so as to move the abutment element from an unlocked position in which the primary and secondary members can rotate relative to each other relative to the 'axis of rotation, in a locked position in which the primary and secondary members are integral in rotation.

According to an advantageous characteristic of the invention, the actuator is provided with a transverse bearing face coming, under the action of forces, in contact with the intermediate member and an actuating face of the clutch.

Preferably, this transverse support face is carried by a cup coming into contact with a peripheral flange carried by the intermediate member.

According to an advantageous characteristic, the abutment element and the flange have respective ends provided with flexible tongues snapped into corresponding orifices provided, respectively, in the secondary member and in a washer carrying the friction discs of the clutch.

According to another characteristic, the mechanism comprises at least one elastic return element opposing the axial forces exerted by the actuator and acting on the intermediate member.

According to a preferred variant, the actuator consists of a clutch control.

According to yet another characteristic, the stop element is connected to the intermediate member via a shoulder extending substantially axially.

According to another advantageous characteristic, the mechanism further comprises two elastically deformable washers, one of which is disposed between the secondary member and the stop element and the other, between said stop element and the shoulder and intended to facilitate, by the restitution of their potential energy, respectively, the unlocking and locking of the two bodies.

According to a first specific variant, the intermediate member is mounted on the secondary member and the abutment element is produced in the form of a keeper intended to engage axially in an orifice made opposite in the primary element to pass from an unlocked position to a locked position.

According to an advantageous characteristic, a guide ramp formed in the primary member or in the secondary member is arranged to cooperate with a counter-ramp of said keeper so as to axially withdraw the keeper from the orifice to pass d 'a locked position to an unlocked position.

In this case, the intermediate member is connected, on the one hand, to said striker and, on the other hand, to the actuator via spacer washers receiving pivoting intermediate elements.

According to other specific variants, the intermediate member is mounted on the primary member and the abutment element consists of an inner face of the shoulder of the intermediate member which comes into friction contact with one side of the secondary organ.

In this particular case, the inner face of the shoulder forming the stop element has a conical profile complementary to the end edge of the secondary member.

According to another specific variant, the shoulder of the intermediate member is extended outside by a cover whose radially inner edge is in contact with the actuator.

In a preferred configuration, the inner edge of said cover is subjected to the axial thrust forces exerted by the actuator.

In these latter variants, it is possible to provide that the stop element is carried by the elastic return element.

According to the most general embodiment of the invention, the primary member is the engine torque input member while the secondary member corresponds to the torque output to the input shaft of the gearbox.

Another object of the invention is a clutch for motor vehicles characterized in that it is normally open and equipped with a lockable filtering mechanism having the characteristics defined above.

Yet another object of the invention is a clutch for motor vehicles characterized in that it is normally closed and equipped with a lockable filtering mechanism having the characteristics defined above.

The invention also relates to a method for locking a filtering mechanism as referred to above.

The invention finds more particularly its application in filtering mechanisms with at least two rotating members and, preferably, those which include a primary member and a secondary member as described in LR2 822 210.

Thanks to the refinement of the invention, it becomes possible to avoid the harmful phenomena linked to crossing the resonance range of the double damping flywheel, in particular during the declutching or slowing down phases of the engine.

BRIEF DESCRIPTION OF THE FIGURES

Other characteristics and advantages of the invention will emerge on reading the description which follows, with reference to the appended and detailed figures below.

Figures IA, IB and IC represent sectional views of a clutch equipped with a first embodiment of the mechanism of the invention in position, respectively; engaged, disengaged and disengaged unlocked, FIGS. 2A, 2B and 2C represent sectional views of a clutch equipped with a second embodiment of the mechanism of the invention in position, respectively; engaged, disengaged and disengaged-locked, FIGS. 3A, 3B and 3C represent sectional views of a clutch equipped with a third embodiment of the mechanism of the invention in position, respectively; clutched, disengaged and disengagedlocked, FIGS. 4A, 4B and 4C represent sectional views of a clutch equipped with a fourth embodiment of the mechanism of the invention in position, respectively; engaged, disengaged and disengaged-locked,

FIGS. 5 represents a sectional view of a variant of the embodiment of the mechanism of the invention of FIGS. 1A to 1C in the engaged position, FIGS. 6A, 6B, 6C (in partial view) and 6D represent views in section a clutch equipped with another variant of the embodiment of the mechanism of the invention of FIGS. 1A to 1C in position, respectively; engaged, disengaged, disengaged armed and disengaged locked,

FIG. 7 represents a partial exploded perspective view of the variant of FIGS. 6A to 6D,

FIG. 8 shows a partial exploded perspective view of another variant of the invention.

For the sake of clarity, identical or similar elements are identified by identical reference signs in all of the figures.

DETAILED DESCRIPTION OF EMBODIMENTS Naturally, the embodiments illustrated by the figures presented above are given only by way of nonlimiting examples. It is explicitly provided that we can combine these different modes and variants to offer others.

The invention relates to a filtering mechanism integrated into a transmission chain between a crankshaft (for example of an internal combustion engine, not shown) and an input shaft of a transmission box (not shown). This mechanism filters speed and torque fluctuations between the crankshaft and the clutch and comprises, as shown in the figures, a primary rotating member 1, a secondary rotating member 2 and at least one bidirectional elastic potential energy accumulator .

In the embodiments shown in the figures, the primary member 1 constitutes the input of the filtration mechanism, that is to say that it is arranged to receive the torque transmitted by the engine and the secondary member 2 constitutes the output of the filtration mechanism, that is to say that it is arranged to transmit to the gearbox, the torque coming from the filtration mechanism.

Alternatively and without departing from the scope of the invention, the secondary member may however constitute the inlet of the filtration mechanism while the primary member may constitute the outlet of the filtration mechanism.

As illustrated here by the sectional views of the assemblies consisting of clutches (reference Y on the right part of the figures) and associated filtering mechanisms (reference X on the left part of the figures), the primary member 1 d the torque input essentially comprises two guide washers 11, 12 fixed to each other and to the engine crankshaft (not shown). A web 15 mounted on a central centering ring 13 is integral with the secondary member 2 which forms the outlet of the filtering mechanism X and provides the connection with the clutch Y. In general, the clutch Y comprises at least one friction disc G (and in FIG. IA, two discs) coming into contact with the secondary member 2 in the engaged position and driving a hub 14 in rotation about the axis of revolution 100 and in engagement with the shaft of gearbox input (not shown). The invention applies equally well to a double clutch comprising two hubs.

The guide washers 11, 12 are provided with curved housings intended for an elastic potential energy accumulator formed of helical springs RI, R2 in series. Each spring is supported by one end against a flange of the housings of the guide washers of the primary member 1.

11 results from this arrangement that the web 15 of the secondary member 2 rotates oscillating angularly relative to the guide washers 11, 12 of the primary 1 around the axis of revolution 100 between two end of travel positions.

A phasing washer 16 ensures the connection between the two springs RI, R2 in series. The forces exerted by the springs RI and R2 on this washer oppose and balance each other.

The filtering mechanism further comprises means for locking the two members 1, 2 and ensuring the temporary blocking of their relative angular oscillation.

According to the invention, these locking means comprise, in particular, an actuator A capable of exerting, axial thrust forces, transmitted to at least one intermediate member 3 mounted coaxially with the axis of revolution 100 and integral in rotation of one of the primary 1 or secondary 2 members by means of at least one elastic return element 4 opposing the axial forces exerted by the actuator A. This actuator is arranged to move the intermediate member 3 axially.

This intermediate member 3 carries a stop member 33 adapted and intended to engage, under the action of these forces, with the other member to ensure the blocking in relative rotation of the primary and secondary members and their mutual locking .

In all the embodiments shown in the appended figures, the kinematics of transmission of forces between the actuator A and the stop element 33 is materialized by a path in solid lines.

The actuator A is mounted on the axis 100 near the hub 14. This actuator is here a hydraulic cylinder provided with a peripheral piston P surrounding the gearbox input shaft.

It would however be possible, according to other variants of the invention not shown in the present figures, to use other types of actuators chosen for association with the locking filter mechanism of the invention and , for example, electrically powered actuators.

The actuator A used in the various variants represented by the invention will be the clutch control cylinder (called "Concentric Slave Cylinder") which has the main function of ensuring the displacement of the diaphragm D. This actuator being necessary for the clutch in order to ensure the function mentioned above, the allocation of this second function makes it possible not to clutter the filtering mechanism and to retain the original compactness.

The actuator A is provided with a transverse support face Al coming, in the disengaged position (Figures IB and IC), under the action of the forces generated by the piston P, in contact with the support intermediate member 3 by compressing the return elements 4. On the other hand, in the engaged position (FIG. IA), the piston P is retracted and the face Al is then at a distance from the intermediate member 3.

To this end, the transverse support surface Al is carried by a cup A2 which comes into contact with a peripheral flange 31 of the intermediate element 3, via pivoting, sliding or sliding intermediate elements B, such as ball bearings or thrust bearings. The cup A2 has a contact face with the flange 31 and a contact face for actuating the clutch Y.

The stop element 33 is, in turn, connected to the intermediate member 3 by a shoulder 32 extending substantially axially.

The abutment element 33 and the shoulder 32 to which it is connected, are not necessarily made around the entire periphery of the intermediate element 3. In fact, to ensure reliable and stable locking of the primary members 1 and secondary 2, it suffices that the shoulder 32 is produced locally on at least two appropriate angular zones of the circumference of the intermediate element 3 and, preferably, on two diametrically opposite zones or more than two zones distributed uniformly over the periphery of the intermediate element 3.

The intermediate member 3 is mounted on one of the primary 1 or secondary 2 members by means of at least one elastic return element 4 opposing the axial forces exerted by the actuator A.

The invention will now be described with reference to the embodiment of Figures IA to IC which corresponds to a clutch called "normally closed". The intermediate member 3 is mounted on the secondary member 2 and the stop element 33 is produced in the form of a keeper 331 intended to lock the primary member 1 with the secondary member 2.

The intermediate member 3 is connected, on the one hand, to the keeper 331 and, on the other hand, to the actuator A via spacer washers E receiving pivoting or sliding intermediate elements B providing an interface dynamic with low coefficient of friction.

Indeed, the stop member 33 is integral in rotation with the secondary member 2 because the keeper 331 is engaged in a slot 20 formed in the plane of the secondary member 2. However, the shoulder 32 is integral in rotation with the friction discs G of the clutch Y. In FIG. 1A, the flange 31 is also integral in rotation with the friction discs G.

Figure IA corresponds to the engaged position of the filtering mechanism in which the primary 1 and secondary 2 bodies are free to oscillate relative to each other within a limited angular range so as to dampen, in cooperation with the springs RI, R2, the vibrations of the motor. In this position, the transverse support face Al of the cup A2 of the actuator A is not in contact with the flange 31 of the intermediate element 3.

The intermediate member 3 cooperates, moreover, with elastic return elements 4 produced here in the form of a washer 41 linked to the hub 14 and ensuring the support of the discs G. The washer 41 is provided with flexible tabs 41a . The intermediate member 3 passes through the washer 41 and therefore the clutch Y in the axial direction between the actuator A and the secondary member 2 and here around the hub 14. According to a variant, not shown, in which the hub would have a large diameter, it would be possible to provide that the intermediate member 3 passes through the hub.

Figure IB corresponds to the disengaged position of the mechanism. In this state, under the action of the thrust forces El exerted by the piston P, the transverse face Al of the cup A2 of the actuator A comes into bearing contact against the flange 31 of the intermediate element 3 by deforming gradually the flexible tabs 41a of the washer 41. When the actuator A consists of the clutch control cylinder, the latter then jointly ensures the displacement of the diaphragm in order to separate the friction discs G from the flywheel. In this state of the mechanism, the primary 1 and secondary 2 members still retain their freedom of movement oscillating with respect to one another.

Figure IC still corresponds to the disengaged position but after the intervention of the inventive locking means. In this position, the keeper 331 has been moved, under the action of the thrust force F1 of the actuator A, parallel to the axis 100, in the direction of the primary member 1 to come into the orifice 10 formed through the member 1 and located opposite the orifice 2 when no torque is transmitted to the damper. In this state, the two members 1, 2 are locked in relative rotation and therefore without freedom of movement oscillating from one relative to the other which avoids the risks of resonance.

At the next clutch phase, at the time of withdrawal of the piston P from the actuator A and thanks to the relaxation of the legs 41a of the elastic washer 41, the intermediate member 3 and the keeper 331 will automatically return to the position of Figure IA.

Figures 5 and 6A to 6D correspond to variants of the embodiment of Figures IA to IC in which the intermediate member 3 is freed from the intermediate washers E of the pivoting or sliding elements (bearings B). The intermediate member 3 rests directly on the shoulder 32 carrying the stop element 33 again produced here in the form of a keeper 331. The respective speeds of rotation of the stop element 33 and of the shoulder 32 are different which leads to a relative rotary contact which will be optimized to limit the friction between these parts.

The elastic return elements 4 are offset between the shoulder 32 and the secondary member 2 and are here produced in the form of at least one elastic washer 44 and, preferably, two elastic washers 44a, 44b, which replaces the tabs 41a of the washer 41. The flange 31 on which the thrust forces Fl of the piston P of the actuator A are exerted, consists of the radially inner edge of the intermediate member 3. A rigid complementary ring 45 receives the support of the end edge of the flange 31.

In the variant of FIGS. 6A to 6D and 7, the keeper 331 and the peripheral edge of the intermediate member 3 are both provided with flexible tongues 330 which project radially outwards and which are snapped in during the assembly, respectively, in the orifice 20 of the secondary member 2 and in an orifice 410 formed in the washer 41 carrying the friction discs G. The tongues 330 are retained axially in the orifices in the manner of a harpoon , their free end abutting against the walls of the orifices 20, 410. The purpose of this elastic retaining mode is to counter the return action of the washers 44a, 44b.

FIGS. 6A to 6D illustrate an energy storage lock, the intermediate phase of FIG. 6C corresponding to a loading prior to the expansion of the energy of the washers 44a, 44b. These elastic washers commonly called "Belleville" washers have a frustoconical profile in the free state and are elastically deformed under stresses, in particular, during assembly of the intermediate member 3 on the clutch and the secondary member 2 by force snap-fastening. tabs 330. Pressing on the flange 31 deforms the washers 44a, 44b and the latter, by shape memory, will restore their potential energy to move the keeper, when the keeper 331 is located opposite the orifice 10 of the primary organ 1.

The washer 44a disposed between the secondary member 2 and the stop member 33 has the function of facilitating unlocking by clutching by pushing on the keeper to extract it from the orifice 10 of the primary member 1.

The washer 44b disposed between the stop member 33 and the washer 45 receiving the support of the flange 31 has the function of facilitating locking after disengaging, by releasing the keeper 331 when the latter comes opposite the orifice 10 of the primary member 1, as illustrated in FIG. 6C.

In another alternative embodiment shown in Figure 8, the primary member 1 comprises a ramp 17 arranged to cooperate with a counter-ramp of the keeper 331. For this purpose, each keeper consists of a tooth and the counter ramp is formed by an end edge with cut sides 331a of said tooth. This tooth is intended to be introduced into a cavity 18 delimiting on the primary member 1 a recessed area with inclined edges forming the guide ramp 17 for the cut sides 331a of the tooth.

For reasons, in particular of sealing, the cavity 18 could be produced in a non-opening manner unlike what is shown in FIG. 8.

Thus, when the actuator A is in a position authorizing an unlocking of the locking means and when a torque applied to the primary member 1 reaches a predetermined threshold value, the ramp 17 exerts on the keeper 331 an effort able to move it from a locked position to an unlocked position. It is then possible to do without an elastic return means for returning the striker to the unlocked position.

In another variant not shown, the keeper has a counter-ramp cooperating with a ramp arranged on the secondary member in the locked position and when the keeper moves from the locked position to the unlocked position.

However, the passage of the keeper from the locked position to the unlocked position can be assisted by an elastic return means such as an elastic washer.

Figures 2A to 2C correspond to a second embodiment of the invention. In this other embodiment and unlike the embodiment described above, the intermediate member 3 is here mounted on the primary member 1 via elastic return elements 4 formed by flexible tongues 42 (visible in FIGS. 2B and 2CJ This variant corresponds to a so-called “normally open” clutch in which there is no diaphragm and which is used, for example, in automatic clutch control boxes.

The stop element 33 consists of an inner face 332 of the shoulder 32 of the intermediate member 3 which cooperates with the end edge 23 of the secondary member 2.

More specifically, the inner face 332 forming the stop element 33 secured to the primary member 1 has a conical profile complementary to the end edge 23 of the secondary member 2 so that the facing surfaces , respectively, of the face 332 and of the edge 23 can establish mutual contact with a sufficient level of friction to prevent an oscillating movement between the first member 1 and the second member 2 and ensure their locking, as illustrated by FIG. 2C in position disengaged from the mechanism.

In this embodiment, the shoulder 32 of the intermediate member 3 is extended outside by a cover 34 secured to the shoulder 32 and whose radially inner edge defines the flange 31 which is here in contact permanent with the support face Al of the actuator A. The radially inner edge of the cover 34 is disposed outside of the cup A2 of the actuator A. In this variant the force which makes it possible to ensure locking is provided by a return spring (not shown) which pushes the pressure plate T of the clutch Y relative to the secondary member 2. This return force makes it possible to have a clutch normally open and is greater than the sum return efforts of the tabs 42 and of the actuator A.

Figures 3A to 3C correspond to a third embodiment of the invention in which the flange 31 of the intermediate element 3 formed from the radially inner edge of the cover 34 is disposed inside the cup A2 of the actuator A. This other mode also corresponds to a so-called “normally open” clutch.

In this case, in the engaged position of the mechanism (Figure 3A), the support face Al on which is exerted the thrust forces F2 of the piston P of the actuator A, retains the flange 31 in its retracted position where the abutment element 33 is kept at a distance from the end edge 23 of the secondary member 2.

The transition to the disengaged position (Figures 3B) is effected by displacement of the piston P in the direction F2. The intermediate member 3 with its stop element 33 is then moved axially by the relaxation of the elastic return tongues 42 ensuring its connection with the primary member 1 until the inner face 332 of the shoulder 32 comes into contact friction with the edge 23 thus ensuring the locking of the primary and secondary members (FIG. 3Cj.

Figures 4A to 4C show a fourth embodiment of the invention still corresponding to a clutch called "normally open" and in which the stop element 33 is carried by the elastic return element 4 ensuring the connection of the intermediate member 3 with the secondary member 1. It is here the secondary member 2 which consists of the assembly of the guide washers 21, 22.

The elastic return element 4 is formed of a flexible blade 43 whose inner end is riveted to the primary member 1 and its outer end is connected to the shoulder 32 of the intermediate member 3. L 'outer end of the blade 43 defines, with the shoulder 32, an inner face 334 here constituting the stop element 33 of the locking means.

When disengaging (Figure 4Bj, due to the withdrawal in the direction F2 of the piston P of the actuator A and under the effect of the expansion of the blade 43, the face 334 approaches the end edge of the guide washer 21 until it comes into contact with its contact to ensure the locking of the primary 1 and secondary 2 members (FIG. 4Cj.

During these latter phases, the combined thrust forces of the return element 4 and of the clutch Y are much greater than the resistance of the piston P so as to ensure that the blade 43 and the locking of the two members 1,

2.

Claims (18)

1. Filtering mechanism (X) for fluctuations in the engine torque around an axis of revolution (100) for a clutch (Y) of a motor vehicle comprising at 5 minus two members, respectively, a primary member (1) and a secondary member (2), rotating about the axis of revolution being able to oscillate angularly with respect to each other, an energy accumulator elastic potential (RI, R2) mounted between said members and means for locking said members ensuring the temporary blocking of their angular oscillation 10 relative, characterized in that said locking means comprise an actuator (A) capable of exerting axial forces (F1, F2) transmitted to at least one intermediate member (3) integral in rotation with one of the primary members (1 ) or secondary (2) and carrying a stop element (33) engaging, under the action of said forces, with the other member to ensure their mutual blocking. 15 2. Filtering mechanism according to claim 1, characterized in that said actuator (A) is provided with a transverse support face (Al) coming, under the action of said forces, into contact with said intermediate member (3 ) and a clutch actuating face (Y). 3. Filtering mechanism according to the preceding claim, characterized in that 20 said transverse support face (Al) of the actuator is carried by a cup (A2) coming into contact with a peripheral flange (31) carried by the intermediate member (3). 4. Filtering mechanism according to the preceding claim, characterized in that the stop element (33) has ends provided with flexible tongues (330) 25 snapped into holes (20) in the secondary member (2). 5. Filtering mechanism according to one of the preceding claims, characterized in that the flange (31) has ends provided with flexible tongues (330) snapped into holes (410) formed in a washer (41) clutch ( Y) carrying friction discs (G). 6. Filtering mechanism according to one of the preceding claims, characterized in that it comprises at least one elastic return element (4) opposing the axial forces (F1, F2) exerted by the actuator (A) and acting on said intermediate member (3). 7. Filtering mechanism according to one of the preceding claims, characterized in that said actuator (A) consists of a clutch control. 8. Filter mechanism according to one of the preceding claims, characterized in that said stop element (33) is connected to the intermediate member (3) via a shoulder (32) extending substantially axially. 9. Filtering mechanism according to the preceding claim, characterized in that it further comprises two elastically deformable washers (44a, 44b), one of which (44a) is disposed between the secondary member (2) and the stop element (33) and the other (44b), between said stop element and the shoulder (32) and intended to facilitate, by the restitution of their potential energy, respectively, the unlocking and locking of the two members ( 1, 2). 10. Filtering mechanism according to one of the preceding claims, characterized in that the intermediate member (3) is mounted on the secondary member (2) and the stop element (33) is produced in the form of a keeper (331) intended to engage axially in an orifice (10) arranged opposite in the primary member (1) to pass from an unlocked position to a locked position. 11. Filtering mechanism according to the preceding claim, characterized in that a guide ramp (17) formed in the primary member (1) or in the secondary member (2) is arranged to cooperate with a counter ramp of said keeper (331) so as to axially withdraw the keeper from the orifice (10) in order to pass from a locked position to an unlocked position. 12. Filtering mechanism according to the preceding claim, characterized in that said intermediate member (3) is connected, on the one hand, to said keeper (331) and, on the other hand, to the actuator (A) via spacer washers (E) receiving pivoting intermediate elements (B). 13. Filtering mechanism according to claim 8, characterized in that the intermediate member (3) is mounted on the primary member (1) and the stop element (33) consists of an inner face (332) of the shoulder (32) of said intermediate member (3) which comes into friction contact with a face of the secondary member (2). 14. Filtering mechanism according to the preceding claim, characterized in that said inner face (332) of the shoulder (32) forming the stop element [33] has a conical profile complementary to the end edge [23] of the secondary organ (2). 15. Filtering mechanism according to claim 13 or 14, characterized in that the shoulder [32] of said intermediate member [3] is extended outside by a cover [34] whose radially inner edge [31] is in contact with the actuator (A). 16. Filtering mechanism according to claim 15, characterized in that the radially inner edge [31] of said cover [34] is subjected to the thrust forces [F1] exerted by the actuator. 17. Filtering mechanism according to claims 6 and 15, characterized in that said stop element [33] is carried by the elastic return element (4). 18. Filtering mechanism according to one of the preceding claims, characterized in that said primary member [1] is the input member of the engine torque while the secondary member [2] corresponds to the output of the torque towards l input shaft of the gearbox. 19. Clutch for motor vehicles characterized in that it is normally open and equipped with a lockable filtering mechanism according to one of the preceding claims. 20. Clutch for motor vehicles characterized in that it is normally closed and equipped with a lockable filtering mechanism according to one of claims 1 to 18. 21. Method for locking a filtering mechanism [X] according to one of claims 1 to 18, characterized in that the blocking in relative rotation of the primary [1] and secondary [2] members is carried out by means of 'a clutch control actuator [A] (Y). 1/18 2/18 15 12 X Y 3/18 15 12 X Y 4/18 5/18 15 12 Ύ-> Γ X Y 6/18 7/18 8/18 9/18 10/18 334 11/18 334 12/18 334 13/18 14/18 15/18 16/18 17/18 18/18 1331