WO2018114546A1 - Method for manufacturing a wear compensation member for a clutch mechanism - Google Patents

Method for manufacturing a wear compensation member for a clutch mechanism Download PDF

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Publication number
WO2018114546A1
WO2018114546A1 PCT/EP2017/082713 EP2017082713W WO2018114546A1 WO 2018114546 A1 WO2018114546 A1 WO 2018114546A1 EP 2017082713 W EP2017082713 W EP 2017082713W WO 2018114546 A1 WO2018114546 A1 WO 2018114546A1
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WO
WIPO (PCT)
Prior art keywords
strip
ramp
pressure plate
clutch mechanism
axis
Prior art date
Application number
PCT/EP2017/082713
Other languages
French (fr)
Inventor
Julien Brailly
Nicolas Deliencourt
Olivier Marechal
Original Assignee
Valeo Embrayages
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Embrayages filed Critical Valeo Embrayages
Publication of WO2018114546A1 publication Critical patent/WO2018114546A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00—Friction clutches
    • F16D13/58—Details
    • F16D13/75—Features relating to adjustment, e.g. slack adjusters
    • F16D13/757—Features relating to adjustment, e.g. slack adjusters the adjusting device being located on or inside the clutch cover, e.g. acting on the diaphragm or on the pressure plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/12—Mounting or assembling

Definitions

  • the present invention relates to a method of manufacturing a wear compensating member for a clutch mechanism, particularly for a motor vehicle.
  • a clutch mechanism belongs, more generally, to a clutch device.
  • a clutch device conventionally comprises a reaction plate, a clutch mechanism comprising a movable pressure plate, and a friction disk mounted between said reaction and pressure plates.
  • the movement of the pressure plate is controlled by a diaphragm, itself controlled by a clutch abutment.
  • the clutch abutment may be of the type actuated actuator, or hydraulic control, or cable control, in order to exert a predetermined force on the diaphragm and to move it into a disengaged position.
  • the pressure plate is thus movable between a clutch position in which the friction disk is clamped between said pressure and reaction plates, and a disengaging position in which the friction disk is released.
  • the use of the clutch device causes wear of the friction disc liners and the counter-materials of the associated pressure and reaction plates. This results in a variation of the position of the pressure plate relative to the associated diaphragm and / or with respect to the reaction plate, generating a variation of the friction disk clamping force and a modification of the licking point and the stroke of the clutch stop. It is recalled that the licking point is the position from which a torque can be transmitted through the clutch device.
  • a wear-catching clutch device is known from the document FR 2 847 626 in the name of the Applicant.
  • a wear-compensating clutch device for a motor vehicle, comprising a pressure plate intended to bear against a friction disc of the clutch device, a diaphragm serving to actuate the pressure plate between a fully engaged position in which said pressure plate is pushed against the friction disk, and a fully disengaged position in which said pressure plate is moved away from the friction disk by means of return means of the pressure plate.
  • the pressure plate, the friction disk and the diaphragm are housed in a cover which is fixed with respect to the reaction plate.
  • the device further comprises a compensating member of the wear of the friction disc, interposed between the diaphragm and the pressure plate, and movable in rotation about an axis in a determined range, said catch member comprising a co-operating ramp. with a counter ramp on the side of the pressure plate, so as to adjust the distance between the diaphragm and the pressure plate and compensate the wear of the friction disc according to the position of the ramp relative to the counter-ramp .
  • the clutch device further comprises displacement means comprising a ratchet wheel adapted to pivot about an axis mounted on a cassette.
  • the displacement means also comprise a pawl comprising a body fixed on the cover and an actuating tab cooperating with the ratchet wheel so as to actuate the pivoting of the ratchet wheel in case of wear.
  • the ratchet wheel is coupled in rotation to a worm mounted around the aforementioned axis and meshing with a toothing of the catch member.
  • the wear compensating member more particularly comprises:
  • a first annular element obtained by a press stamping and cutting process, one axial end of which has ramps inclined with respect to the radial plane, intended to cooperate with counter-ramps of the pressure plate,
  • a second element comprising a toothed part fixed by riveting to the first element
  • a third element forming a balancing element, fixed by riveting to the first element and located diametrically opposite to the second element.
  • the second element is engaged axially between tabs and a radial wall of the cassette, so as to keep it axially in position opposite the axis of the worm. This ensures effective meshing between the toothed part and the worm.
  • the second element is able to be elastically deformed so as to allow the axial displacement of the first element in order to adapt to the axial movement of lifting or lowering of the pressure plate during the clutching or disengaging phases.
  • the stamping process requires expensive press tools.
  • the stamping process generates, in the development of the first annular element, a loss of material, non-valued, located in the center of the annular piece.
  • the invention aims to provide a simple and economical manufacturing method of such a wear-compensating member.
  • Such a method makes it possible to achieve, in a simple, fast and inexpensive manner, a wear-compensating element.
  • a wear-compensating element makes it possible to limit the loss of material during the manufacturing process.
  • the rolling operation is a particular form of bending which makes it possible to shape, that is to say, to bend the strip so as to bring the two ends of the strip into line before the welding operation.
  • the strip may be cut so as to have tabs extending perpendicular to the longitudinal direction of the strip, said tabs being folded so as to extend radially outwardly from the remainder of the strip. the band.
  • the tabs are bent at 90 ° after bending the band.
  • the tabs can be folded before bending the tape.
  • Legs made of material with the rest of the band can further facilitate the manufacture of the first element.
  • the tabs are bent at 90 ° to the rest of the band.
  • a third element said balancing element, can be fixed on the first element, the third element being diametrically opposite to the second element relative to the axis of the first annular element.
  • the balancing portion serves to limit or avoid unbalance so as to reduce vibration during operation, when the wear compensating member is rotated with the remainder of the clutch mechanism about its axis.
  • the second element and / or the third element can be fixed to the lugs of the first element, for example by riveting.
  • the second element and the third element can be obtained by cutting a sheet, the second element and the third element each having an arcuate shape.
  • the arc of circle may have the same center as the axis of the first annular element.
  • the third member may be integral with the strip, said third member being folded to extend radially outwardly relative to the remainder of the strip after bending said strip.
  • the invention also relates to a wear compensating member for a clutch mechanism, particularly for a motor vehicle, obtained by the aforementioned manufacturing method.
  • Said catch-up device may comprise:
  • a first annular element of axis X whose axial end comprises at least one ramp inclined with respect to the radial plane, intended to cooperate with a counter-ramp of the clutch mechanism, the first element being obtained by bending, for example by rolling, a band and then welding the ends of the band together,
  • a second element comprising a toothed zone.
  • the first annular portion can also ensure the centering of the catch member, for example by cooperation with pads of a pressure plate of the clutch mechanism.
  • the pads can come from material with the pressure plate. Alternatively, the pads can be reported on the pressure plate.
  • the studs form a discontinuous bore.
  • the wear compensating member may be received in a continuous bore formed directly in the pressure plate.
  • the toothed portion is adapted to mesh with an endless screw actuated in case of wear of a friction disc, so as to rotate the ramp relative to the corresponding against-ramp.
  • Such a wear-compensating member has a simple and inexpensive structure to manufacture.
  • the second element may be elastically deformable so as to allow the axial displacement of the tooth zone with respect to the ramp of the first element, by elastic deformation of the second element.
  • the elasticity of the toothed part allows the toothed part to remain in position axially opposite the axis of the corresponding worm, said worm being axially fixed, while permitting the axial displacement of the first part bearing the ramps, so as to adapt to the axial movement of lifting or lowering of the pressure plate during the clutching or disengaging phases.
  • Such axial movement of the first part is for example between 1 and 5 mm.
  • the first member may include tabs extending from the remainder of the first annular member radially outwardly.
  • the member may comprise a third element, said balancing element, fixed to the first element and diametrically opposed to the second element relative to the axis of the first element.
  • the balancing portion serves to limit or avoid unbalance so as to reduce vibration during operation, when the wear compensating member is rotated with the remainder of the clutch mechanism about its axis.
  • the second element and / or the third element can be fixed to the lugs of the first element, for example by riveting.
  • the first element and the third element can come from material in one piece.
  • the second element may comprise a central portion in the shape of an arc of circle of X axis, whose radially outer edge comprises a toothed zone carrying teeth, said middle portion being connected, at its circumferential ends, to the first element, via radially extending connecting portions.
  • the medial portion of the second element is separated from the first element by at least one opening or at least one arcuate slot, of axis X.
  • the circumferential ends of said opening or said slot are delimited by the radially extending connecting portions.
  • the middle portion of the second member may be separated from the first member by a plurality of openings or a plurality of slots.
  • Such a structure provides good axial elasticity to the toothed portion, while being relatively simple.
  • the teeth can be oriented radially outwards.
  • the third element may comprise a central portion in the form of an arc of X-axis circle, said median portion being connected, at its circumferential ends, to the first element, via radially extending connecting portions.
  • the medial portion of the third element is separated from the first element by at least one opening or at least one arcuate slot, of axis X.
  • the circumferential ends of said opening or said slot are delimited by the radially extending connecting portions.
  • the middle portion of the third member may be separated from the first member by a plurality of openings or a plurality of slots.
  • the first element can be cylindrical.
  • the second element and / or the third element may extend in a radial plane.
  • the second element may extend in a plane parallel to the plane formed by the third element.
  • the first element is for example made of DC04 steel according to the EN 10139 standard. Such a material makes it easy to bend the first part, for example by rolling.
  • the second element is for example made of pre-treated steel such as cold-rolled spring steel, for example C60S according to standard NF EN 10132-4.
  • This material has good characteristics in terms of elastic deformation, while providing sufficient mechanical characteristics for making a toothing.
  • the third element is made for example of DC04 steel according to the EN 10139 standard.
  • This material makes it possible in particular to easily obtain the third element by cutting a sheet.
  • the invention also relates to a clutch mechanism, in particular for a motor vehicle, comprising
  • a diaphragm movable between an engaged position and a disengaged position, able to actuate the displacement of the pressure plate
  • Wear compensating means comprising at least one wear compensating member of the aforementioned type, interposed axially between the diaphragm and the pressure plate, the ramp of said member cooperating with a counter-ramp of the mechanism, so that that the rotation of the ramp relative to the counter-ramp modifies the axial distance between the diaphragm and the pressure plate, and means for rotating the wear compensating member, said drive means rotation comprising at least one worm meshing with the tooth zone of the wear compensating member.
  • the invention further relates to a clutch device comprising a clutch mechanism of the aforementioned type, characterized in that it comprises a reaction plate, a friction disc interposed axially between the pressure plate and the reaction plate so that it can be clamped between the pressure plate and the reaction plate in the engaged position and so that it can be released in the disengaged position, the lid being fixed relative to the plate of reaction.
  • FIG. 1 is an exploded perspective view of a clutch mechanism according to the invention
  • FIG. 2 is a perspective view of the mechanism
  • FIG. 3 is a perspective view, with partial cutaway, of the mechanism
  • FIG. 4 is a view in axial section of the device
  • FIG. 5 is a perspective view, from above, of a wear-compensating member according to a first embodiment of the invention
  • FIG. 6 is a view from above of a strip forming the first member, before bending,
  • FIG. 7 is a view illustrating a second embodiment of the invention.
  • FIG. 8 is a view from above of the strip forming the first element and the third element before shaping, here by bending and folding, for example, of the catching member of FIG. 7.
  • Figures 1 to 6 show a clutch mechanism 1 to make up wear according to a first embodiment of the invention. It comprises an annular fixed cover 2 of axis X, intended to be fixed on a reaction plate 3, an annular pressure plate 4 and movable along the axis X with respect to the reaction plate 3 (FIG. 4) and to the cover 2.
  • a friction disc 5 is intended to be interposed axially between the pressure plate 4 and the reaction plate 3.
  • the lid 2 has a generally hollow or bell shape. More particularly, the lid 2 comprises an annular portion 6 extending generally radially and a generally cylindrical portion 7 extending from the radially outer periphery of the annular portion 6. The free end of the cylindrical portion 7 is fixed to the plate of reaction 3, for example by riveting or screwing at radial flanges 8 of the cover 2.
  • the pressure plate 4 is housed in the internal volume of the lid 2.
  • a diaphragm 9 is mounted in the internal volume, said diaphragm 9 having a deformable annular portion 10, in the manner of a Belleville washer, from which actuating fingers 1 1 extend radially inwards.
  • the radially inner periphery of the fingers January 1 is adapted to cooperate with a clutch abutment, as is known per se.
  • the diaphragm 9 is mounted bearing on the cover 2, at the level of bearing zones 12, and is held in abutment on said zones 12 by means of hooks 13 which are fixed to the cover 2 by means of rivets 14 .
  • the diaphragm 9 serves to actuate the pressure plate 4 between a fully engaged position in which said pressure plate 4 is pushed towards the reaction plate 3, so as to grip the friction disk 5 between said plates 3, 4, and a disengaged position in which said pressure plate 4 is spaced apart from the reaction plate 3 so as to release the friction disk 5.
  • resilient tongues 15 able to exert an axial force connect the cover 2 and the plate of 4.
  • the tongues 15 are arranged to resiliently bias the pressure plate 4 to its disengaged position.
  • Wear compensating means are interposed axially between the pressure plate 4 and the diaphragm 9. More particularly, the diaphragm 9 cooperates with said wear compensating means. in an area located radially outside the bearing zones 12 of said diaphragm 9 on the cover 2.
  • These means comprise a wear compensating member 16 rotatable about the X axis, comprising a first element 17, a second element 18 and a third element 19.
  • the first element 17 comprises a cylindrical portion 20 of axis X, having an axial end 21 against which the diaphragm 9 is intended to bear, and an axial end 22 having ramps 23 oblique with respect to the radial plane and extending circumferentially, cooperating with counter-ramps 23a associated ( Figure 1), formed directly on the pressure plate 4.
  • the angle of each ramp 23 of the catch member 16 and the counter-ramp 23a associated with the pressure plate 4 is between 2 and 12 °.
  • the inner surface 24 of the cylindrical portion 20 is adapted to cooperate with pads 25 of the pressure plate 4 so as to ensure the centering of the catch member 16.
  • the first element 17 further comprises lugs 26 extending radially outwardly from the cylindrical portion 20.
  • the tabs 26 are bent at 90 ° with respect to the cylindrical portion 20.
  • the first element 17 is for example made of steel DC04.
  • the second element 18 extends generally in a radial plane and comprises a central portion 27 in the form of an arc of axis X, the radially outer edge of which has a toothed zone 28 carrying teeth 29.
  • the toothed zone 28 of the middle portion 27 of the second element 18 forms a circumferentially extending rack capable of cooperating with displacement means, described below, so as to be rotated about the X axis, in case of wear of the friction disc 5.
  • Said middle portion 27 further comprises, at its circumferential ends, connecting portions 30 extending radially inwards.
  • the connecting portions 30 of the second element 18 are fixed to the lugs 26 of the first element 17, for example by rivets 31.
  • other fastening means could be provided such as welding or bolting for example.
  • the second element 18 is located radially outside the first element 17.
  • the medial portion 27 of the second element 18 is separated from the first element 17 by at least one opening or at least one slot 32 in the form of a circular arc, of axis X.
  • the circumferential ends of said opening or said slot 32 are delimited by the connecting portions 30 extending radially.
  • the middle portion 27 of the second member 18 may be separated from the first member 17 by a plurality of openings or a plurality of slots 32.
  • the middle portion 27 of the second element 18 extends angularly over an angular range between 80 and 150 ° for example.
  • the second element 18 is elastically deformable in the axial direction.
  • the second element 18 is for example made of pre-treated steel such as cold rolled spring steel, for example C60S.
  • the third element 19, said balancing element, also extends in a radial plane and is diametrically opposite to the second element 18 with respect to the axis X.
  • the third element 19 comprises a median portion 33 in the form of an arc of axis X.
  • Said medial portion 33 comprises, at its circumferential ends and in a central zone, connecting portions 34 extending radially towards the center inside.
  • the connecting portions 34 of the third member 19 are fixed to the lugs 26 of the first member 17, for example by rivets 35.
  • other fastening means could be provided such as welding or bolting for example.
  • the third element 19 is located radially outside the first element 17.
  • the middle portion 33 of the third element 19 is separated from the first element 17 by at least one opening or at least one slot 36 in the shape of a circular arc, of axis X.
  • the circumferential ends of said opening or said slot 36 are delimited by the connecting portions 34 extending radially.
  • the middle portion 33 of the third member 19 may be separated from the first member 17 by a plurality of openings or a plurality of slots 36.
  • the middle portion 33 of the third element 19 extends angularly over an angular range between 80 and 150 ° for example.
  • the third element 19 is made for example of DC04 steel.
  • the second element 18 and the third element 19 extend substantially in the same radial plane.
  • the second element 18 extends in a plane parallel to the plane formed by the third element 19, the two planes being offset axially.
  • the displacement means comprise a worm 37 kept in engagement with the rack of the toothed zone 28.
  • the worm 37 is coupled in rotation to a ratchet wheel 38 cooperating with a pawl 39 comprising an actuating tab 40 of which the free end engages with the ratchet wheel 38 and whose actuation of the free end is caused by the wear of the friction disc 5.
  • the position of the ratchet wheel 38 relative to said free end of the tab 40 of the pawl 39 varies as a function of the wear of the friction disk 5 and the position of the pressure plate 4, so that the pawl 39 is able to drive the ratchet wheel 38, in case of wear of the friction disc 5, by moving the pressure plate 4 between its engaged and disengaged positions, as is known in itself.
  • the rotation of the ratchet wheel 38 thus causes the rotational movement of the catch member 16 and therefore a change in the axial distance between the bearing zone and the pressure plate 4, due to the presence of the ramp. 23 and against the ramp 23a. This variation in distance makes it possible to compensate for the wear of the friction disc 5 when necessary.
  • the ratchet wheel 38 and the worm 37 are mounted to pivot about an axis 41 (FIG. 1), the assembly being housed in a cassette 42.
  • the cassette 42 is itself housed in a hollow zone 43 formed in the cylindrical portion 7 of the lid 2.
  • the toothed area 28 is interposed axially between a radial base 44 of the cassette 42 and positioning tabs 45 of the cassette 42, so as to maintain axially in position the toothed zone 28 facing the axis of the worm 37 , so as to ensure optimum meshing.
  • the toothed zone 28 because of its slightly curved shape and its axial elasticity, is held in a prestressed manner bearing on the base 44. This ensures the maintenance in the axial position of the tooth zone 28 opposite the axis of the worm 37.
  • the catch member 16 according to a first embodiment illustrated in particular in FIGS. 5 and 6, is made according to a manufacturing method comprising the steps of:
  • the cut strip 46 comprises, with respect to the axis of the strip 46, a first longitudinal edge 48, forming the axial end 21 of the first element 17, and a second longitudinal edge 49 forming the axial end 22.
  • the second edge longitudinal 49 comprises at least one ramp 23 inclined with respect to the longitudinal direction of the strip 46.
  • the rolling operation is a particular form of bending which makes it possible to shape, that is to say, to bend the band 46 so as to bring the two ends 47 of the band 46 into alignment before the welding operation.
  • the welding zone 48 in which the ends 47 of the strip 46 are connected end to end, is located angularly between two ramps 23.
  • the welding zone 48 is located between the tabs 26 on which the second element is attached, for example by riveting.
  • the welding is for example of the laser welding type.
  • the band 46 is cut so as to have the tabs 26 extending perpendicularly to the longitudinal direction of the band 46.
  • the tabs 26 are integral with the remainder of the band 46 and s extend from the second longitudinal edge 22.
  • the tabs 26 are folded so as to extend radially outwardly from the remainder of the strip 46. This folding operation can occur prior to bending or, conversely, after bending.
  • the method further comprises a step prior to step c), during which the second element 18 and the third element 19 are cut in a sheet, this sheet being able to be of a different material for each of the three elements 17, 18, 19.
  • FIGS. 7 and 8 illustrate a second embodiment of the catch member 16 which differs from the member 16 illustrated in FIGS. 1 to 6 in that the third element 19 is integral with the first element 17.
  • the third element 19 comes from matter with the band 46.
  • the manufacturing method of the member 16 according to the second embodiment therefore differs from that mentioned above in that after the bending, the third element 19 is folded, like the legs 26, so as to extend radially. outward from the rest of the band 46.
  • the third element 19 could also be folded before bending.
  • the pressure plate 4 In operation, the pressure plate 4 is moved axially between its engaged and disengaged positions, driving with it the axial displacement of the catch member 16.
  • the toothed zone 28, maintained axially, is thus caused to be deformed elastically during the displacement axial pressure plate 4.
  • the axial displacement of the pressure plate 4 between its engaged and disengaged positions is for example between 0.5 and 3 mm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

The invention relates to a method for manufacturing a wear compensation member for a clutch mechanism, notably for motor vehicle, comprising the steps consisting in:a) cutting a strip (46) from a sheet metal, the said strip (46) comprising a first longitudinal edge (48) and a second longitudinal edge (49), with respect to the axis of the strip (46), the second longitudinal edge (49) comprising at least one ramp (23) that is inclined with respect to the said longitudinal direction, the said strip (46) having two ends (47), b) bending, for example by rolling, the said strip (46) and then joining the end (47) of the strip (46) together by welding, so as to form a first annular element, c) attaching a second element to the first element, the second element comprising a toothed zone.

Description

PROCEDE DE FABRICATION D'UN ORGANE DE RATTRAPAGE D'USURE POUR UN MECANISME D'EMBRAYAGE  METHOD FOR MANUFACTURING A WEAR RETRIEVAL MEMBER FOR A CLUTCH MECHANISM
La présente invention concerne un procédé de fabrication d'un organe de rattrapage d'usure pour un mécanisme d'embrayage, notamment pour véhicule automobile. The present invention relates to a method of manufacturing a wear compensating member for a clutch mechanism, particularly for a motor vehicle.
Un mécanisme d'embrayage appartient, de façon plus générale, à un dispositif d'embrayage.  A clutch mechanism belongs, more generally, to a clutch device.
Un dispositif d'embrayage comporte classiquement un plateau de réaction, un mécanisme d'embrayage comportant un plateau de pression mobile, et un disque de friction monté entre lesdits plateaux de réaction et de pression. Le mouvement du plateau de pression est commandé par un diaphragme, lui-même commandé par une butée d'embrayage.  A clutch device conventionally comprises a reaction plate, a clutch mechanism comprising a movable pressure plate, and a friction disk mounted between said reaction and pressure plates. The movement of the pressure plate is controlled by a diaphragm, itself controlled by a clutch abutment.
La butée d'embrayage peut être du type actionneur piloté, ou commande hydraulique, ou commande à câble, afin d'exercer une force prédéterminée sur le diaphragme et de le déplacer dans une position débrayée.  The clutch abutment may be of the type actuated actuator, or hydraulic control, or cable control, in order to exert a predetermined force on the diaphragm and to move it into a disengaged position.
Le plateau de pression est ainsi mobile entre une position d'embrayage dans laquelle le disque de friction est serré entre lesdits plateaux de pression et de réaction, et une position de débrayage dans laquelle le disque de friction est libéré.  The pressure plate is thus movable between a clutch position in which the friction disk is clamped between said pressure and reaction plates, and a disengaging position in which the friction disk is released.
L'utilisation du dispositif d'embrayage provoque une usure des garnitures du disque de friction ainsi que des contre-matériaux des plateaux de pression et de réaction associés. Ceci se traduit par une variation de la position du plateau de pression par rapport au diaphragme associé et/ou par rapport au plateau de réaction, générant une variation de l'effort de serrage du disque de friction et une modification du point de léchage et de la course de la butée d'embrayage. On rappelle que le point de léchage est la position à partir de laquelle un couple peut être transmis au travers du dispositif d'embrayage. Un dispositif d'embrayage à rattrapage d'usure est connu du document FR 2 847 626 au nom de la Demanderesse. Ce document divulgue un dispositif d'embrayage à rattrapage d'usure pour véhicule automobile, comportant un plateau de pression destiné à venir en appui sur un disque de friction du dispositif d'embrayage, un diaphragme servant à l'actionnement du plateau de pression entre une position totalement embrayée dans laquelle ledit plateau de pression est poussé contre le disque de friction, et une position totalement débrayée dans laquelle ledit plateau de pression est écarté du disque de friction par l'intermédiaire de moyens de rappel du plateau de pression. The use of the clutch device causes wear of the friction disc liners and the counter-materials of the associated pressure and reaction plates. This results in a variation of the position of the pressure plate relative to the associated diaphragm and / or with respect to the reaction plate, generating a variation of the friction disk clamping force and a modification of the licking point and the stroke of the clutch stop. It is recalled that the licking point is the position from which a torque can be transmitted through the clutch device. A wear-catching clutch device is known from the document FR 2 847 626 in the name of the Applicant. This document discloses a wear-compensating clutch device for a motor vehicle, comprising a pressure plate intended to bear against a friction disc of the clutch device, a diaphragm serving to actuate the pressure plate between a fully engaged position in which said pressure plate is pushed against the friction disk, and a fully disengaged position in which said pressure plate is moved away from the friction disk by means of return means of the pressure plate.
Le plateau de pression, le disque de friction et le diaphragme sont logés dans un couvercle qui est fixe par rapport au plateau de réaction.  The pressure plate, the friction disk and the diaphragm are housed in a cover which is fixed with respect to the reaction plate.
Le dispositif comporte en outre un organe de rattrapage de l'usure du disque de friction, intercalé entre le diaphragme et le plateau de pression, et mobile en rotation autour d'un axe dans une plage déterminée, ledit organe de rattrapage comportant une rampe coopérant avec une contre-rampe du côté du plateau de pression, de façon à ajuster la distance entre le diaphragme et le plateau de pression et compenser l'usure du disque de friction en fonction de la position de la rampe par rapport à la contre-rampe.  The device further comprises a compensating member of the wear of the friction disc, interposed between the diaphragm and the pressure plate, and movable in rotation about an axis in a determined range, said catch member comprising a co-operating ramp. with a counter ramp on the side of the pressure plate, so as to adjust the distance between the diaphragm and the pressure plate and compensate the wear of the friction disc according to the position of the ramp relative to the counter-ramp .
Le dispositif d'embrayage comporte en outre des moyens de déplacement comprenant une roue à rochet apte à pivoter autour d'un axe monté sur une cassette. Les moyens de déplacement comportent également un cliquet comportant un corps fixé sur le couvercle et une patte d'actionnement coopérant avec la roue à rochet de manière à actionner le pivotement de la roue à rochet en cas d'usure. La roue à rochet est couplée en rotation à une vis sans fin montée autour de l'axe précité et engrenant avec une denture de l'organe de rattrapage. Ainsi, la rotation de ladite roue à rochet entraîne le déplacement de l'organe de rattrapage de façon à compenser l'usure. L'organe de rattrapage d'usure comporte plus particulièrement :The clutch device further comprises displacement means comprising a ratchet wheel adapted to pivot about an axis mounted on a cassette. The displacement means also comprise a pawl comprising a body fixed on the cover and an actuating tab cooperating with the ratchet wheel so as to actuate the pivoting of the ratchet wheel in case of wear. The ratchet wheel is coupled in rotation to a worm mounted around the aforementioned axis and meshing with a toothing of the catch member. Thus, the rotation of said ratchet wheel causes the retraction member to move in order to compensate for the wear. The wear compensating member more particularly comprises:
- un premier élément annulaire, obtenu par un procédé d'emboutissage et de découpe sur presse, dont une extrémité axiale comporte des rampes inclinées par rapport au plan radial, destinées à coopérer avec des contres-rampes du plateau de pression, a first annular element, obtained by a press stamping and cutting process, one axial end of which has ramps inclined with respect to the radial plane, intended to cooperate with counter-ramps of the pressure plate,
- un deuxième élément comportant une partie dentée, fixé par rivetage au premier élément,  a second element comprising a toothed part fixed by riveting to the first element,
- un troisième élément formant un élément d'équilibrage, fixé par rivetage au premier élément et situé de façon diamétralement opposée par rapport au deuxième élément.  - A third element forming a balancing element, fixed by riveting to the first element and located diametrically opposite to the second element.
Le deuxième élément est engagé axialement entre des pattes et une paroi radiale de la cassette, de manière à le maintenir axialement en position en regard de l'axe de la vis sans fin. Ceci permet d'assurer un engrènement efficace entre la partie dentée et la vis sans fin.  The second element is engaged axially between tabs and a radial wall of the cassette, so as to keep it axially in position opposite the axis of the worm. This ensures effective meshing between the toothed part and the worm.
Le deuxième élément est apte à être déformé élastiquement de façon à autoriser le débattement axial du premier élément afin de s'adapter au mouvement axial de levée ou de descente du plateau de pression lors des phases d'embrayage ou de débrayage.  The second element is able to be elastically deformed so as to allow the axial displacement of the first element in order to adapt to the axial movement of lifting or lowering of the pressure plate during the clutching or disengaging phases.
Le procédé d'emboutissage nécessite des outillages de presse onéreux. De plus, le procédé d'emboutissage génère, dans l'élaboration du premier élément annulaire, une perte de matière, non valorisée, située au centre de la pièce annulaire.  The stamping process requires expensive press tools. In addition, the stamping process generates, in the development of the first annular element, a loss of material, non-valued, located in the center of the annular piece.
L'invention vise à proposer un procédé de fabrication simple et économique d'un tel organe de rattrapage d'usure.  The invention aims to provide a simple and economical manufacturing method of such a wear-compensating member.
A cet effet, elle propose un procédé de fabrication d'un organe de rattrapage d'usure pour un mécanisme d'embrayage, notamment pour véhicule automobile, comportant les étapes consistant à :  For this purpose, it proposes a method of manufacturing a wear-compensating member for a clutch mechanism, in particular for a motor vehicle, comprising the steps of:
a) découper une bande dans une tôle métallique, ladite bande comportant un premier bord longitudinal et un second bord longitudinal, par rapport à l'axe de la bande, le second bord longitudinal comportant au moins une rampe inclinée par rapport à ladite direction longitudinale, ladite bande comportant deux extrémités, a) cutting a strip into a metal sheet, said strip having a first longitudinal edge and a second longitudinal edge, with respect to the axis of the strip, the second longitudinal edge comprising at least one at least one ramp inclined with respect to said longitudinal direction, said band having two ends,
b) cintrer, par exemple par roulage, ladite bande puis assembler les extrémités de la bande entre elles par soudage, de façon à former un premier élément annulaire,  b) bending, for example by rolling, said strip and then assembling the ends of the strip together by welding, so as to form a first annular element,
c) fixer un deuxième élément sur le premier élément, le deuxième élément comportant une zone dentée.  c) fixing a second element on the first element, the second element comprising a toothed zone.
Un tel procédé permet de réaliser de façon simple, rapide et peu coûteuse, un élément de rattrapage d'usure. En outre, un tel procédé permet de limiter la perte de matière au cours du procédé de fabrication.  Such a method makes it possible to achieve, in a simple, fast and inexpensive manner, a wear-compensating element. In addition, such a method makes it possible to limit the loss of material during the manufacturing process.
L'opération de roulage est une forme particulière de cintrage qui permet de mettre en forme, c'est-à-dire de courber la bande en vue de faire concorder les deux extrémités de la bande avant l'opération de soudage.  The rolling operation is a particular form of bending which makes it possible to shape, that is to say, to bend the strip so as to bring the two ends of the strip into line before the welding operation.
Lors de l'étape a), la bande peut être découpée de façon à présenter des pattes s'étendant perpendiculairement à la direction longitudinale de la bande, lesdites pattes étant repliées de façon à s'étendre radialement vers l'extérieur depuis le reste de la bande. Avantageusement, les pattes sont repliées à 90° après cintrage de la bande. En variante, les pattes peuvent être repliées avant le cintrage de la bande.  In step a), the strip may be cut so as to have tabs extending perpendicular to the longitudinal direction of the strip, said tabs being folded so as to extend radially outwardly from the remainder of the strip. the band. Advantageously, the tabs are bent at 90 ° after bending the band. Alternatively, the tabs can be folded before bending the tape.
Les pattes venues de matière avec le reste de la bande permettent de faciliter encore la fabrication du premier élément.  Legs made of material with the rest of the band can further facilitate the manufacture of the first element.
Avantageusement, les pattes sont pliées à 90° par rapport au reste de la bande.  Advantageously, the tabs are bent at 90 ° to the rest of the band.
Un troisième élément, dit élément d'équilibrage, peut être fixé sur le premier élément, le troisième élément étant diamétralement opposée au deuxième élément par rapport à l'axe du premier élément annulaire.  A third element, said balancing element, can be fixed on the first element, the third element being diametrically opposite to the second element relative to the axis of the first annular element.
La partie d'équilibrage permet de limiter ou d'éviter les balourds de manière à réduire les vibrations en fonctionnement, lorsque l'organe de rattrapage d'usure est entraîné en rotation avec le reste du mécanisme d'embrayage, autour de son axe. Le deuxième élément et/ou le troisième élément peuvent être fixés aux pattes du premier élément, par exemple par rivetage. The balancing portion serves to limit or avoid unbalance so as to reduce vibration during operation, when the wear compensating member is rotated with the remainder of the clutch mechanism about its axis. The second element and / or the third element can be fixed to the lugs of the first element, for example by riveting.
Le deuxième élément et le troisième élément peuvent être obtenus par découpage d'une tôle, le deuxième élément et le troisième élément présentant chacun une forme d'arc de cercle.  The second element and the third element can be obtained by cutting a sheet, the second element and the third element each having an arcuate shape.
L'arc de cercle peut avoir le même centre que l'axe du premier élément annulaire.  The arc of circle may have the same center as the axis of the first annular element.
Le troisième élément peut venir de matière avec la bande, ledit troisième élément étant replié de façon à s'étendre radialement vers l'extérieur par rapport au reste de la bande après cintrage de ladite bande.  The third member may be integral with the strip, said third member being folded to extend radially outwardly relative to the remainder of the strip after bending said strip.
L'invention concerne également un organe de rattrapage d'usure pour un mécanisme d'embrayage, notamment pour véhicule automobile, obtenu par le procédé de fabrication précité.  The invention also relates to a wear compensating member for a clutch mechanism, particularly for a motor vehicle, obtained by the aforementioned manufacturing method.
Ledit organe de rattrapage peut comporter :  Said catch-up device may comprise:
- un premier élément annulaire d'axe X dont une extrémité axiale comporte au moins une rampe inclinée par rapport au plan radial, destinée à coopérer avec une contre-rampe du mécanisme d'embrayage, le premier élément étant obtenu par cintrage, par exemple par roulage, d'une bande puis soudage des extrémités de la bande entre elles,  a first annular element of axis X whose axial end comprises at least one ramp inclined with respect to the radial plane, intended to cooperate with a counter-ramp of the clutch mechanism, the first element being obtained by bending, for example by rolling, a band and then welding the ends of the band together,
- un deuxième élément comportant une zone dentée. a second element comprising a toothed zone.
Outre la fonction de rampe, la première partie annulaire peut également assurer le centrage de l'organe de rattrapage, par exemple par coopération avec des plots d'un plateau de pression du mécanisme d'embrayage. Les plots peuvent être venus de matière avec le plateau de pression. En variante, les plots peuvent être rapportés sur le plateau de pression. In addition to the ramp function, the first annular portion can also ensure the centering of the catch member, for example by cooperation with pads of a pressure plate of the clutch mechanism. The pads can come from material with the pressure plate. Alternatively, the pads can be reported on the pressure plate.
Avantageusement, les plots forment un alésage discontinu. En variante, l'organe de rattrapage d'usure peut être reçu dans un alésage continu formé directement dans le plateau de pression. La partie dentée est apte à engrener avec une vis sans fin actionnée en cas d'usure d'un disque de friction, de façon à faire tourner la rampe par rapport à la contre-rampe correspondante. Advantageously, the studs form a discontinuous bore. Alternatively, the wear compensating member may be received in a continuous bore formed directly in the pressure plate. The toothed portion is adapted to mesh with an endless screw actuated in case of wear of a friction disc, so as to rotate the ramp relative to the corresponding against-ramp.
Un tel organe de rattrapage d'usure présente une structure simple et peu coûteux à fabriquer.  Such a wear-compensating member has a simple and inexpensive structure to manufacture.
Le second élément peut être déformable élastiquement de façon à autoriser le déplacement axial de la zone dentée par rapport à la rampe du premier élément, par déformation élastique du deuxième élément.  The second element may be elastically deformable so as to allow the axial displacement of the tooth zone with respect to the ramp of the first element, by elastic deformation of the second element.
L'élasticité de la partie dentée autorise le maintien en position de la partie dentée axialement en regard de l'axe de la vis sans fin correspondante, ladite vis sans fin étant axialement fixe, tout en permettant le déplacement axial de la première partie portant les rampes, de façon à s'adapter au mouvement axial de levée ou de descente du plateau de pression lors des phases d'embrayage ou de débrayage. Un tel mouvement axial de la première partie est par exemple compris entre 1 et 5 mm.  The elasticity of the toothed part allows the toothed part to remain in position axially opposite the axis of the corresponding worm, said worm being axially fixed, while permitting the axial displacement of the first part bearing the ramps, so as to adapt to the axial movement of lifting or lowering of the pressure plate during the clutching or disengaging phases. Such axial movement of the first part is for example between 1 and 5 mm.
Le premier élément peut comporter des pattes s'étendant depuis le reste du premier élément annulaire, radialement vers l'extérieur.  The first member may include tabs extending from the remainder of the first annular member radially outwardly.
L'organe peut comprendre un troisième élément, dit élément d'équilibrage, fixé au premier élément et diamétralement opposé au deuxième élément par rapport à l'axe du premier élément.  The member may comprise a third element, said balancing element, fixed to the first element and diametrically opposed to the second element relative to the axis of the first element.
La partie d'équilibrage permet de limiter ou d'éviter les balourds de manière à réduire les vibrations en fonctionnement, lorsque l'organe de rattrapage d'usure est entraîné en rotation avec le reste du mécanisme d'embrayage, autour de son axe.  The balancing portion serves to limit or avoid unbalance so as to reduce vibration during operation, when the wear compensating member is rotated with the remainder of the clutch mechanism about its axis.
Le deuxième élément et/ou le troisième élément peuvent être fixés aux pattes du premier élément, par exemple par rivetage.  The second element and / or the third element can be fixed to the lugs of the first element, for example by riveting.
Le premier élément et le troisième élément peuvent être venus de matière en une seule pièce.  The first element and the third element can come from material in one piece.
Le deuxième élément peut comporter une portion médiane en forme d'arc de cercle d'axe X, dont le bord radialement externe comporte une zone dentée portant des dents, ladite portion médiane étant reliée, au niveau de ses extrémités circonférentielles, au premier élément, par l'intermédiaire de portions de liaison s'étendant radialement. The second element may comprise a central portion in the shape of an arc of circle of X axis, whose radially outer edge comprises a toothed zone carrying teeth, said middle portion being connected, at its circumferential ends, to the first element, via radially extending connecting portions.
En d'autres termes, la portion médiane du deuxième élément est séparée du premier élément par au moins une ouverture ou au moins une fente en forme d'arc de cercle, d'axe X. Les extrémités circonférentielles de ladite ouverture ou de ladite fente sont délimitées par les portions de liaison s'étendant radialement. En variante, la portion médiane du deuxième élément peut être séparée du premier élément par une pluralité d'ouvertures ou une pluralité de fentes.  In other words, the medial portion of the second element is separated from the first element by at least one opening or at least one arcuate slot, of axis X. The circumferential ends of said opening or said slot are delimited by the radially extending connecting portions. Alternatively, the middle portion of the second member may be separated from the first member by a plurality of openings or a plurality of slots.
Une telle structure offre une bonne élasticité axiale à la partie dentée, tout en étant relativement simple.  Such a structure provides good axial elasticity to the toothed portion, while being relatively simple.
Les dents peuvent être orientées radialement vers l'extérieur. The teeth can be oriented radially outwards.
Le troisième élément peut comporter une portion médiane en forme d'arc de cercle d'axe X, ladite portion médiane étant reliée, au niveau de ses extrémités circonférentielles, au premier élément, par l'intermédiaire de portions de liaison s'étendant radialement. The third element may comprise a central portion in the form of an arc of X-axis circle, said median portion being connected, at its circumferential ends, to the first element, via radially extending connecting portions.
En d'autres termes, la portion médiale du troisième élément est séparée du premier élément par au moins une ouverture ou au moins une fente en forme d'arc de cercle, d'axe X. Les extrémités circonférentielles de ladite ouverture ou de ladite fente sont délimitées par les portions de liaison s'étendant radialement. En variante, la portion médiane du troisième élément peut être séparée du premier élément par une pluralité d'ouvertures ou une pluralité de fentes.  In other words, the medial portion of the third element is separated from the first element by at least one opening or at least one arcuate slot, of axis X. The circumferential ends of said opening or said slot are delimited by the radially extending connecting portions. Alternatively, the middle portion of the third member may be separated from the first member by a plurality of openings or a plurality of slots.
Le premier élément peut être cylindrique.  The first element can be cylindrical.
Le deuxième élément et/ou le troisième élément peuvent s'étendre dans un plan radial.  The second element and / or the third element may extend in a radial plane.
Le deuxième élément peut s'étendre dans un plan parallèle au plan formé par le troisième élément.  The second element may extend in a plane parallel to the plane formed by the third element.
Le premier élément est par exemple réalisé en acier DC04 suivant la norme EN 10139. Un tel matériau permet de réaliser aisément le cintrage de la première partie, par roulage par exemple. The first element is for example made of DC04 steel according to the EN 10139 standard. Such a material makes it easy to bend the first part, for example by rolling.
Le deuxième élément est par exemple réalisé en acier prétraité tel qu'un acier à ressort laminé à froid, par exemple en C60S suivant la norme NF EN 10132-4.  The second element is for example made of pre-treated steel such as cold-rolled spring steel, for example C60S according to standard NF EN 10132-4.
Ce matériau présente de bonnes caractéristiques en termes de déformation élastique, tout en offrant des caractéristiques mécaniques suffisantes pour la réalisation d'une denture.  This material has good characteristics in terms of elastic deformation, while providing sufficient mechanical characteristics for making a toothing.
Le troisième élément est réalisé par exemple en acier DC04 suivant la norme EN 10139.  The third element is made for example of DC04 steel according to the EN 10139 standard.
Ce matériau permet notamment d'obtenir facilement le troisième élément par découpe d'une tôle.  This material makes it possible in particular to easily obtain the third element by cutting a sheet.
L'invention concerne également un mécanisme d'embrayage, notamment pour véhicule automobile, comportant  The invention also relates to a clutch mechanism, in particular for a motor vehicle, comprising
- un couvercle fixe,  - a fixed cover,
- un plateau de pression mobile axialement par rapport au couvercle,  a pressure plate movable axially with respect to the lid,
- un diaphragme mobile entre une position embrayée et une position débrayée, apte à actionner le déplacement du plateau de pression,  a diaphragm movable between an engaged position and a disengaged position, able to actuate the displacement of the pressure plate,
- des moyens de rattrapage d'usure comportant au moins un organe de rattrapage d'usure du type précité, intercalé axialement entre le diaphragme et le plateau de pression, la rampe dudit organe coopérant avec une contre-rampe du mécanisme, de façon à ce que la rotation de la rampe par rapport à la contre-rampe modifie la distance axiale entre le diaphragme et le plateau de pression, et des moyens d'entraînement en rotation de l'organe de rattrapage d'usure, lesdits moyens d'entraînement en rotation comportant au moins une vis sans fin engrenant avec la zone dentée de l'organe de rattrapage d'usure.  - Wear compensating means comprising at least one wear compensating member of the aforementioned type, interposed axially between the diaphragm and the pressure plate, the ramp of said member cooperating with a counter-ramp of the mechanism, so that that the rotation of the ramp relative to the counter-ramp modifies the axial distance between the diaphragm and the pressure plate, and means for rotating the wear compensating member, said drive means rotation comprising at least one worm meshing with the tooth zone of the wear compensating member.
L'invention concerne, de plus, un dispositif d'embrayage comprenant un mécanisme d'embrayage du type précité, caractérisé en ce qu'il comporte un plateau de réaction, un disque de friction intercalé axialement entre le plateau de pression et le plateau de réaction de façon à pouvoir être serré entre le plateau de pression et le plateau de réaction en position embrayée et de façon à pouvoir être libéré en position débrayée, le couvercle étant fixe par rapport au plateau de réaction. The invention further relates to a clutch device comprising a clutch mechanism of the aforementioned type, characterized in that it comprises a reaction plate, a friction disc interposed axially between the pressure plate and the reaction plate so that it can be clamped between the pressure plate and the reaction plate in the engaged position and so that it can be released in the disengaged position, the lid being fixed relative to the plate of reaction.
L'invention sera mieux comprise et d'autres détails, caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante faite à titre d'exemple non limitatif en référence aux dessins annexés dans lesquels :  The invention will be better understood and other details, characteristics and advantages of the invention will appear on reading the following description given by way of non-limiting example with reference to the accompanying drawings in which:
- la figure 1 est une vue éclatée, en perspective, d'un mécanisme d'embrayage selon l'invention,  FIG. 1 is an exploded perspective view of a clutch mechanism according to the invention,
- la figure 2 est vue en perspective du mécanisme,  FIG. 2 is a perspective view of the mechanism,
- la figure 3 est vue en perspective, avec écorché partiel, du mécanisme,  FIG. 3 is a perspective view, with partial cutaway, of the mechanism,
- la figure 4 est une vue en coupe axial du dispositif, - la figure 5 est une vue en perspective, de dessus, d'un organe de rattrapage d'usure selon une première forme de réalisation de l'invention,  FIG. 4 is a view in axial section of the device; FIG. 5 is a perspective view, from above, of a wear-compensating member according to a first embodiment of the invention;
- la figure 6 est une vue de dessus d'une bande formant le premier organe, avant cintrage,  FIG. 6 is a view from above of a strip forming the first member, before bending,
- la figure 7 est une vue illustrant une seconde forme de réalisation de l'invention,  FIG. 7 is a view illustrating a second embodiment of the invention,
- la figure 8 est une vue de dessus de la bande formant le premier élément et le troisième élément avant mise en forme, ici par cintrage et pliage par exemple, de l'organe de rattrapage de la figure 7.  FIG. 8 is a view from above of the strip forming the first element and the third element before shaping, here by bending and folding, for example, of the catching member of FIG. 7.
Les figures 1 à 6 représentent un mécanisme d'embrayage 1 à rattrapage d'usure selon une première forme de réalisation de l'invention. Celui-ci comporte un couvercle fixe annulaire 2 d'axe X, destiné à être fixé sur un plateau de réaction 3, un plateau de pression 4 annulaire et mobile selon l'axe X par rapport au plateau de réaction 3 (figure 4) et au couvercle 2. Un disque de friction 5 est destiné à être intercalé axialement entre le plateau de pression 4 et le plateau de réaction 3. Le couvercle 2 présente une forme générale creuse ou de cloche. Plus particulièrement, le couvercle 2 comporte une partie annulaire 6 s'étendant globalement radialement et une partie 7 globalement cylindrique s'étendant depuis la périphérie radialement externe de la partie annulaire 6. L'extrémité libre de la partie cylindrique 7 est fixée au plateau de réaction 3, par exemple par rivetage ou vissage au niveau de brides radiales 8 du couvercle 2. Figures 1 to 6 show a clutch mechanism 1 to make up wear according to a first embodiment of the invention. It comprises an annular fixed cover 2 of axis X, intended to be fixed on a reaction plate 3, an annular pressure plate 4 and movable along the axis X with respect to the reaction plate 3 (FIG. 4) and to the cover 2. A friction disc 5 is intended to be interposed axially between the pressure plate 4 and the reaction plate 3. The lid 2 has a generally hollow or bell shape. More particularly, the lid 2 comprises an annular portion 6 extending generally radially and a generally cylindrical portion 7 extending from the radially outer periphery of the annular portion 6. The free end of the cylindrical portion 7 is fixed to the plate of reaction 3, for example by riveting or screwing at radial flanges 8 of the cover 2.
Le plateau de pression 4 est logé dans le volume interne du couvercle 2.  The pressure plate 4 is housed in the internal volume of the lid 2.
Un diaphragme 9 est monté dans le volume interne, ledit diaphragme 9 comportant une partie annulaire déformable 10, à la manière d'une rondelle Belleville, à partir de laquelle des doigts d'actionnement 1 1 s'étendent radialement vers l'intérieur. La périphérie radialement interne des doigts 1 1 est apte à coopérer avec une butée d'embrayage, comme cela est connu en soi. Le diaphragme 9 est monté en appui sur le couvercle 2, au niveau de zones d'appui 12, et est maintenu en appui sur lesdites zones 12 par l'intermédiaire de crochets 13 qui sont fixés au couvercle 2 à l'aide de rivets 14.  A diaphragm 9 is mounted in the internal volume, said diaphragm 9 having a deformable annular portion 10, in the manner of a Belleville washer, from which actuating fingers 1 1 extend radially inwards. The radially inner periphery of the fingers January 1 is adapted to cooperate with a clutch abutment, as is known per se. The diaphragm 9 is mounted bearing on the cover 2, at the level of bearing zones 12, and is held in abutment on said zones 12 by means of hooks 13 which are fixed to the cover 2 by means of rivets 14 .
Le diaphragme 9 sert à l'actionnement du plateau de pression 4 entre une position totalement embrayée dans laquelle ledit plateau de pression 4 est poussé vers le plateau de réaction 3, de façon à enserrer le disque de friction 5 entre lesdits plateaux 3, 4, et une position débrayée dans laquelle ledit plateau de pression 4 est écarté du plateau de réaction 3 de façon à libérer le disque de friction 5. A cet effet, des languettes élastiques 15 aptes à exercer un effort axial relient le couvercle 2 et le plateau de pression 4. Les languettes 15 sont agencées de façon à rappeler élastiquement le plateau de pression 4 vers sa position débrayée.  The diaphragm 9 serves to actuate the pressure plate 4 between a fully engaged position in which said pressure plate 4 is pushed towards the reaction plate 3, so as to grip the friction disk 5 between said plates 3, 4, and a disengaged position in which said pressure plate 4 is spaced apart from the reaction plate 3 so as to release the friction disk 5. For this purpose, resilient tongues 15 able to exert an axial force connect the cover 2 and the plate of 4. The tongues 15 are arranged to resiliently bias the pressure plate 4 to its disengaged position.
Des moyens de rattrapage d'usure sont intercalés axialement entre le plateau de pression 4 et le diaphragme 9. Plus particulièrement, le diaphragme 9 vient coopérer avec lesdits moyens de rattrapage d'usure dans une zone située radialement à l'extérieur des zones d'appui 12 dudit diaphragme 9 sur le couvercle 2. Wear compensating means are interposed axially between the pressure plate 4 and the diaphragm 9. More particularly, the diaphragm 9 cooperates with said wear compensating means. in an area located radially outside the bearing zones 12 of said diaphragm 9 on the cover 2.
Ces moyens comportent un organe de rattrapage d'usure 16 mobile en rotation autour de l'axe X, comprenant un premier élément 17, un deuxième élément 18 et un troisième élément 19.  These means comprise a wear compensating member 16 rotatable about the X axis, comprising a first element 17, a second element 18 and a third element 19.
Le premier élément 17 comprend une partie cylindrique 20 d'axe X, comportant une extrémité axiale 21 contre laquelle le diaphragme 9 est destiné à venir en appui, et une extrémité axiale 22 comportant des rampes 23 obliques par rapport au plan radial et s'étendant circonférentiellement, coopérant avec des contres-rampes 23a associées (figure 1 ), ménagées directement sur le plateau de pression 4. A titre d'exemple, l'angle de chaque rampe 23 de l'organe de rattrapage 16 et de la contre-rampe 23a associée du plateau de pression 4 est compris entre 2 et 12°.  The first element 17 comprises a cylindrical portion 20 of axis X, having an axial end 21 against which the diaphragm 9 is intended to bear, and an axial end 22 having ramps 23 oblique with respect to the radial plane and extending circumferentially, cooperating with counter-ramps 23a associated (Figure 1), formed directly on the pressure plate 4. For example, the angle of each ramp 23 of the catch member 16 and the counter-ramp 23a associated with the pressure plate 4 is between 2 and 12 °.
La surface interne 24 de la partie cylindrique 20 est apte à coopérer avec des plots 25 du plateau de pression 4 de façon à assurer le centrage de l'organe de rattrapage 16.  The inner surface 24 of the cylindrical portion 20 is adapted to cooperate with pads 25 of the pressure plate 4 so as to ensure the centering of the catch member 16.
Le premier élément 17 comprend, en outre, des pattes 26 s'étendant radialement vers l'extérieur depuis la partie cylindrique 20.  The first element 17 further comprises lugs 26 extending radially outwardly from the cylindrical portion 20.
Les pattes 26 sont pliées à 90° par rapport à la partie cylindrique 20.  The tabs 26 are bent at 90 ° with respect to the cylindrical portion 20.
Le premier élément 17 est par exemple réalisé en acier DC04. The first element 17 is for example made of steel DC04.
Le deuxième élément 18 s'étend globalement dans un plan radial et comporte une portion médiane 27 en forme d'arc de cercle d'axe X, dont le bord radialement externe comporte une zone dentée 28 portant des dents 29. La zone dentée 28 de la portion médiane 27 du deuxième élément 18 forme une crémaillère s'étendant circonférentiellement, apte à coopérer avec des moyens de déplacement, décrits ci-après, de façon à être entraîné en rotation autour de l'axe X, en cas d'usure du disque de friction 5. Ladite portion médiane 27 comprend, en outre, au niveau de ses extrémités circonférentielles, des portions de liaison 30 s'étendant radialement vers l'intérieur. The second element 18 extends generally in a radial plane and comprises a central portion 27 in the form of an arc of axis X, the radially outer edge of which has a toothed zone 28 carrying teeth 29. The toothed zone 28 of the middle portion 27 of the second element 18 forms a circumferentially extending rack capable of cooperating with displacement means, described below, so as to be rotated about the X axis, in case of wear of the friction disc 5. Said middle portion 27 further comprises, at its circumferential ends, connecting portions 30 extending radially inwards.
Les portions de liaison 30 du deuxième élément 18 sont fixées aux pattes 26 du premier élément 17, par exemple par des rivets 31 . En alternative, d'autres moyens de fixation pourraient être prévus tels que le soudage ou le boulonnage par exemple.  The connecting portions 30 of the second element 18 are fixed to the lugs 26 of the first element 17, for example by rivets 31. Alternatively, other fastening means could be provided such as welding or bolting for example.
Le deuxième élément 18 est situé radialement à l'extérieur du premier élément 17.  The second element 18 is located radially outside the first element 17.
La portion médiane 27 du deuxième élément 18 est séparée du premier élément 17 par au moins une ouverture ou au moins une fente 32 en forme d'arc de cercle, d'axe X. Les extrémités circonférentielles de ladite ouverture ou de ladite fente 32 sont délimitées par les portions de liaison 30 s'étendant radialement. En variante, la portion médiane 27 du deuxième élément 18 peut être séparée du premier élément 17 par une pluralité d'ouvertures ou une pluralité de fentes 32.  The medial portion 27 of the second element 18 is separated from the first element 17 by at least one opening or at least one slot 32 in the form of a circular arc, of axis X. The circumferential ends of said opening or said slot 32 are delimited by the connecting portions 30 extending radially. Alternatively, the middle portion 27 of the second member 18 may be separated from the first member 17 by a plurality of openings or a plurality of slots 32.
La portion médiane 27 du deuxième élément 18, s'étend angulairement sur une plage angulaire comprise entre 80 et 150° par exemple.  The middle portion 27 of the second element 18 extends angularly over an angular range between 80 and 150 ° for example.
Le deuxième élément 18 est élastiquement déformable dans la direction axiale.  The second element 18 is elastically deformable in the axial direction.
Le deuxième élément 18 est par exemple réalisé en acier prétraité tel qu'un acier à ressort laminé à froid, par exemple en C60S .  The second element 18 is for example made of pre-treated steel such as cold rolled spring steel, for example C60S.
Le troisième élément 19, dit élément d'équilibrage, s'étend également dans un plan radial et est diamétralement opposé au deuxième élément 18 par rapport à l'axe X.  The third element 19, said balancing element, also extends in a radial plane and is diametrically opposite to the second element 18 with respect to the axis X.
Le troisième élément 19 comporte une portion médiane 33 en forme d'arc de cercle d'axe X. Ladite portion médiane 33 comporte, au niveau de ses extrémités circonférentielles et dans une zone centrale, des portions de liaison 34 s'étendant radialement vers l'intérieur. Les portions de liaison 34 du troisième élément 19 sont fixées aux pattes 26 du premier élément 17, par exemple par des rivets 35. En alternative, d'autres moyens de fixation pourraient être prévus tels que le soudage ou le boulonnage par exemple. The third element 19 comprises a median portion 33 in the form of an arc of axis X. Said medial portion 33 comprises, at its circumferential ends and in a central zone, connecting portions 34 extending radially towards the center inside. The connecting portions 34 of the third member 19 are fixed to the lugs 26 of the first member 17, for example by rivets 35. Alternatively, other fastening means could be provided such as welding or bolting for example.
Le troisième élément 19 est situé radialement à l'extérieur du premier élément 17.  The third element 19 is located radially outside the first element 17.
La portion médiane 33 du troisième élément 19 est séparée du premier élément 17 par au moins une ouverture ou au moins une fente 36 en forme d'arc de cercle, d'axe X. Les extrémités circonférentielles de ladite ouverture ou de ladite fente 36 sont délimitées par les portions de liaison 34 s'étendant radialement. En variante, la portion médiane 33 du troisième élément 19 peut être séparée du premier élément 17 par une pluralité d'ouvertures ou une pluralité de fentes 36.  The middle portion 33 of the third element 19 is separated from the first element 17 by at least one opening or at least one slot 36 in the shape of a circular arc, of axis X. The circumferential ends of said opening or said slot 36 are delimited by the connecting portions 34 extending radially. Alternatively, the middle portion 33 of the third member 19 may be separated from the first member 17 by a plurality of openings or a plurality of slots 36.
La portion médiane 33 du troisième élément 19 s'étend angulairement sur une plage angulaire comprise entre 80 et 150° par exemple.  The middle portion 33 of the third element 19 extends angularly over an angular range between 80 and 150 ° for example.
Le troisième élément 19 est réalisé par exemple en acier DC04. The third element 19 is made for example of DC04 steel.
Le deuxième élément 18 et le troisième élément 19 s'étendent sensiblement dans un même plan radial. The second element 18 and the third element 19 extend substantially in the same radial plane.
En variante non représentée, le deuxième élément 18 s'étend dans un plan parallèle au plan formé par le troisième élément 19, les deux plans étant décalés axialement.  In a variant that is not shown, the second element 18 extends in a plane parallel to the plane formed by the third element 19, the two planes being offset axially.
Les moyens de déplacement comportent une vis sans fin 37 maintenue en engrènement avec la crémaillère de la zone dentée 28. La vis sans fin 37 est couplée en rotation à une roue à rochet 38 coopérant avec un cliquet 39 comportant une patte d'actionnement 40 dont l'extrémité libre vient en prise avec la roue à rochet 38 et dont l'actionnement de l'extrémité libre est provoquée par l'usure du disque de friction 5.  The displacement means comprise a worm 37 kept in engagement with the rack of the toothed zone 28. The worm 37 is coupled in rotation to a ratchet wheel 38 cooperating with a pawl 39 comprising an actuating tab 40 of which the free end engages with the ratchet wheel 38 and whose actuation of the free end is caused by the wear of the friction disc 5.
La position de la roue à rochet 38 par rapport à ladite extrémité libre de la patte 40 du cliquet 39 varie en fonction de l'usure du disque de friction 5 et de la position du plateau de pression 4, de façon à ce que le cliquet 39 soit apte à entraîner la roue à rochet 38, en cas d'usure du disque de friction 5, par déplacement du plateau de pression 4 entre ses positions embrayée et débrayée, comme cela est connu en soit. La rotation de la roue à rochet 38 entraîne ainsi le déplacement en rotation de l'organe de rattrapage 16 et donc une modification de la distance axiale entre la zone d'appui et le plateau de pression 4, du fait de la présence de la rampe 23 et de la contre-rampe 23a. Cette variation de distance permet de compenser l'usure du disque de friction 5 en cas de besoin. The position of the ratchet wheel 38 relative to said free end of the tab 40 of the pawl 39 varies as a function of the wear of the friction disk 5 and the position of the pressure plate 4, so that the pawl 39 is able to drive the ratchet wheel 38, in case of wear of the friction disc 5, by moving the pressure plate 4 between its engaged and disengaged positions, as is known in itself. The rotation of the ratchet wheel 38 thus causes the rotational movement of the catch member 16 and therefore a change in the axial distance between the bearing zone and the pressure plate 4, due to the presence of the ramp. 23 and against the ramp 23a. This variation in distance makes it possible to compensate for the wear of the friction disc 5 when necessary.
La roue à rochet 38 et la vis sans fin 37 sont montées pivotante autour d'un axe 41 (figure 1 ), l'ensemble étant logé dans une cassette 42. La cassette 42 est elle-même logée dans une zone creuse 43 formée dans la partie cylindrique 7 du couvercle 2.  The ratchet wheel 38 and the worm 37 are mounted to pivot about an axis 41 (FIG. 1), the assembly being housed in a cassette 42. The cassette 42 is itself housed in a hollow zone 43 formed in the cylindrical portion 7 of the lid 2.
La zone dentée 28 est intercalée axialement entre une base radiale 44 de la cassette 42 et des pattes de positionnement 45 de la cassette 42, de façon à maintenir axialement en position la zone dentée 28 en regard de l'axe de la vis sans fin 37, de manière à garantir un engrènement optimal. La zone dentée 28, du fait de sa forme légèrement courbée et de son élasticité axiale, est maintenue de façon précontrainte en appui sur la base 44. On garantit ainsi le maintien en position axiale de la zone dentée 28 en regard de l'axe de la vis sans fin 37.  The toothed area 28 is interposed axially between a radial base 44 of the cassette 42 and positioning tabs 45 of the cassette 42, so as to maintain axially in position the toothed zone 28 facing the axis of the worm 37 , so as to ensure optimum meshing. The toothed zone 28, because of its slightly curved shape and its axial elasticity, is held in a prestressed manner bearing on the base 44. This ensures the maintenance in the axial position of the tooth zone 28 opposite the axis of the worm 37.
L'organe de rattrapage 16 selon une première forme de réalisation illustrée notamment aux figures 5 et 6, est réalisé selon un procédé de fabrication comportant les étapes consistant à :  The catch member 16 according to a first embodiment illustrated in particular in FIGS. 5 and 6, is made according to a manufacturing method comprising the steps of:
a) découper une bande 46 dans une tôle métallique, ladite bande comportant deux extrémités 47,  a) cutting a strip 46 in a metal sheet, said strip comprising two ends 47,
b) cintrer ou rouler ladite bande 46 puis assembler les extrémités 47 de la bande 46 entre elles par soudage, de façon à former le premier élément annulaire 17,  b) bending or rolling said strip 46 and then assembling the ends 47 of the strip 46 between them by welding, so as to form the first annular element 17,
c) fixer le deuxième élément 18 sur le premier élément 17, par exemple par rivetage. La bande 46 découpée comporte, par rapport à l'axe de la bande 46, un premier bord longitudinal 48, formant l'extrémité axiale 21 du premier élément 17, et un second bord longitudinal 49 formant l'extrémité axiale 22. Le second bord longitudinal 49 comporte au moins une rampe 23 inclinée par rapport à la direction longitudinale de la bande 46. c) fixing the second element 18 on the first element 17, for example by riveting. The cut strip 46 comprises, with respect to the axis of the strip 46, a first longitudinal edge 48, forming the axial end 21 of the first element 17, and a second longitudinal edge 49 forming the axial end 22. The second edge longitudinal 49 comprises at least one ramp 23 inclined with respect to the longitudinal direction of the strip 46.
L'opération de roulage est une forme particulière de cintrage qui permet de mettre en forme, c'est-à-dire de courber la bande 46 en vue de faire concorder les deux extrémités 47 de la bande 46 avant l'opération de soudage.  The rolling operation is a particular form of bending which makes it possible to shape, that is to say, to bend the band 46 so as to bring the two ends 47 of the band 46 into alignment before the welding operation.
La zone de soudure 48, dans laquelle les extrémités 47 de la bande 46 sont reliées bout à bout, est située angulairement entre deux rampes 23.  The welding zone 48, in which the ends 47 of the strip 46 are connected end to end, is located angularly between two ramps 23.
Selon un mode de réalisation illustré à la figure 5, la zone de soudure 48 est située entre les pattes 26 sur lesquelles le deuxième élément est rapporté, par exemple par rivetage.  According to an embodiment illustrated in FIG. 5, the welding zone 48 is located between the tabs 26 on which the second element is attached, for example by riveting.
La soudure est par exemple du type soudure laser.  The welding is for example of the laser welding type.
Lors de l'étape a), la bande 46 est découpée de façon à présenter les pattes 26 s'étendant perpendiculairement à la direction longitudinale de la bande 46. Les pattes 26 sont donc venues de matière avec le reste de la bande 46 et s'étendent depuis le second bord longitudinal 22.  During step a), the band 46 is cut so as to have the tabs 26 extending perpendicularly to the longitudinal direction of the band 46. The tabs 26 are integral with the remainder of the band 46 and s extend from the second longitudinal edge 22.
Après découpe de la bande 46, les pattes 26 sont repliées de façon à s'étendre radialement vers l'extérieur depuis le reste de la bande 46. Cette opération de pliage peut intervenir préalablement au cintrage ou, au contraire, après le cintrage.  After cutting the strip 46, the tabs 26 are folded so as to extend radially outwardly from the remainder of the strip 46. This folding operation can occur prior to bending or, conversely, after bending.
Le procédé comprend, en outre, une étape antérieure à l'étape c), durant laquelle le deuxième élément 18 et le troisième élément 19 sont découpés dans une tôle, cette tôle pouvant être d'un matériau différent pour chacun des trois éléments 17, 18, 19.  The method further comprises a step prior to step c), during which the second element 18 and the third element 19 are cut in a sheet, this sheet being able to be of a different material for each of the three elements 17, 18, 19.
Le troisième élément 19 est ensuite fixé aux pattes 26 du premier élément 17, par exemple par rivetage. Les figures 7 et 8 illustrent une seconde forme de réalisation de l'organe de rattrapage 16 qui diffère de l'organe 16 illustré aux figures 1 à 6 en ce que le troisième élément 19 est venu de matière avec le premier élément 17. The third element 19 is then attached to the lugs 26 of the first element 17, for example by riveting. FIGS. 7 and 8 illustrate a second embodiment of the catch member 16 which differs from the member 16 illustrated in FIGS. 1 to 6 in that the third element 19 is integral with the first element 17.
En d'autres termes, comme cela est visible sur la figure 8, le troisième élément 19 vient de matière avec la bande 46.  In other words, as can be seen in FIG. 8, the third element 19 comes from matter with the band 46.
Le procédé de fabrication de l'organe 16 selon la seconde forme de réalisation diffère donc de celui précité en ce qu'après le cintrage, le troisième élément 19 est replié, à l'instar des pattes 26, de sorte à s'étendre radialement vers l'extérieur depuis le reste de la bande 46.  The manufacturing method of the member 16 according to the second embodiment therefore differs from that mentioned above in that after the bending, the third element 19 is folded, like the legs 26, so as to extend radially. outward from the rest of the band 46.
Le troisième élément 19 pourrait également être replié préalablement au cintrage.  The third element 19 could also be folded before bending.
En fonctionnement, le plateau de pression 4 est déplacé axialement entre ses positions embrayée et débrayée, entraînant avec lui le déplacement axial de l'organe de rattrapage 16. La zone dentée 28, maintenue axialement, est donc amenée à être déformée élastiquement lors du déplacement axial du plateau de pression 4.  In operation, the pressure plate 4 is moved axially between its engaged and disengaged positions, driving with it the axial displacement of the catch member 16. The toothed zone 28, maintained axially, is thus caused to be deformed elastically during the displacement axial pressure plate 4.
Le déplacement axial du plateau de pression 4 entre ses positions embrayée et débrayée est par exemple compris entre 0.5 et 3 mm.  The axial displacement of the pressure plate 4 between its engaged and disengaged positions is for example between 0.5 and 3 mm.

Claims

REVENDICATIONS
1 . Procédé de fabrication d'un organe de rattrapage d'usure (16) pour un mécanisme d'embrayage (1 ), notamment pour véhicule automobile, comportant les étapes consistant à : 1. A method of manufacturing a wear compensating member (16) for a clutch mechanism (1), particularly for a motor vehicle, comprising the steps of:
a) découper une bande (46) dans une tôle métallique, ladite bande (46) comportant un premier bord longitudinal (48) et un second bord longitudinal (49), par rapport à l'axe de la bande (46), le second bord longitudinal (49) comportant au moins une rampe (23) inclinée par rapport à ladite direction longitudinale, ladite bande (46) comportant deux extrémités (47),  a) cutting a strip (46) into a metal sheet, said strip (46) having a first longitudinal edge (48) and a second longitudinal edge (49), relative to the axis of the strip (46), the second longitudinal edge (49) having at least one ramp (23) inclined relative to said longitudinal direction, said band (46) having two ends (47),
b) cintrer, par exemple par roulage, ladite bande (46) puis assembler les extrémités (47) de la bande (46) entre elles par soudage, de façon à former un premier élément annulaire (17),  b) bending, for example by rolling, said strip (46) then assemble the ends (47) of the strip (46) together by welding, so as to form a first annular element (17),
c) fixer un deuxième élément (18) sur le premier élément (17), le deuxième élément (18) comportant une zone dentée (28).  c) attaching a second member (18) to the first member (17), the second member (18) having a toothed region (28).
2. Procédé selon la revendication 1 , dans lequel, lors de l'étape a), la bande (46) est découpée de façon à présenter des pattes (26) s'étendant perpendiculairement à la direction longitudinale de la bande (46), lesdites pattes (26) étant repliées de façon à s'étendre radialement vers l'extérieur depuis le reste de la bande (46).  The method of claim 1, wherein, in step a), the web (46) is cut to have tabs (26) extending perpendicular to the longitudinal direction of the web (46), said tabs (26) being folded to extend radially outward from the remainder of the web (46).
3. Procédé selon la revendication 2, dans lequel les pattes (26) sont repliées à 90° après l'opération b) de cintrage de la bande (46).  3. The method of claim 2, wherein the tabs (26) are folded at 90 ° after b) bending operation of the strip (46).
4. Procédé selon la revendication 1 à 3, dans lequel, un troisième élément (19), dit élément d'équilibrage, est fixé sur le premier élément (17), le troisième élément (19) étant diamétralement opposé au deuxième élément (18) par rapport à l'axe X du premier élément annulaire (17). 4. Method according to claim 1 to 3, wherein a third element (19), said balancing element, is fixed on the first element (17), the third element (19) being diametrically opposed to the second element (18). ) with respect to the X axis of the first annular element (17).
5. Procédé selon les revendications 2 ou 3 et 4, dans lequel le deuxième élément (18) et/ou le troisième élément (19) sont fixés aux pattes (26) du premier élément (17), par exemple par rivetage. 5. Method according to claims 2 or 3 and 4, wherein the second element (18) and / or the third element (19) are fixed to the lugs (26) of the first element (17), for example by riveting.
6. Procédé selon la revendication 4, dans lequel le deuxième élément (18) et le troisième élément (19) sont obtenus par découpage d'une tôle, le deuxième élément (18) et le troisième élément (19) présentant chacun une forme d'arc de cercle.  6. The method of claim 4, wherein the second element (18) and the third element (19) are obtained by cutting a sheet, the second element (18) and the third element (19) each having a shape of 'arc.
7. Procédé selon l'une des revendications 4 à 6, dans lequel le troisième élément (19) vient de matière avec la bande (46), ledit troisième élément (19) étant replié de façon à s'étendre radialement vers l'extérieur par rapport au reste de la bande (46) après cintrage de ladite bande (46).  7. Method according to one of claims 4 to 6, wherein the third element (19) comes from material with the strip (46), said third member (19) being folded so as to extend radially outwards relative to the remainder of the web (46) after bending said web (46).
8. Organe de rattrapage d'usure (16) pour un mécanisme d'embrayage (1 ), notamment pour véhicule automobile, caractérisé en ce qu'il est obtenu par le procédé de fabrication selon l'une des revendications 1 à 7, ledit organe de rattrapage (16) comportant :  8. Wear compensating member (16) for a clutch mechanism (1), in particular for a motor vehicle, characterized in that it is obtained by the manufacturing method according to one of claims 1 to 7, said catch-up member (16) comprising:
- un premier élément annulaire (17) d'axe X dont une extrémité axiale (22) comporte au moins une rampe (23) inclinée par rapport au plan radial, destinée à coopérer avec une contre-rampe (23a) du mécanisme d'embrayage (1 ), le premier élément (17) étant obtenu par cintrage, par exemple par roulage, d'une bande (46) puis soudage des extrémités (47) de la bande (46) entre elles,  a first annular element (17) of axis X, whose axial end (22) comprises at least one ramp (23) inclined relative to the radial plane, intended to cooperate with a counter ramp (23a) of the clutch mechanism (1), the first element (17) being obtained by bending, for example by rolling, a band (46) and then welding the ends (47) of the band (46) together,
- un deuxième élément (18) comportant une zone dentée (28). a second element (18) comprising a tooth zone (28).
9. Organe (16) selon la revendication 8, dans lequel le deuxième élément (18) est déformable élastiquement de façon à autoriser le déplacement axial de la zone dentée (28) par rapport à la rampe (23) du premier élément (17), par déformation élastique du deuxième élément (18). 9. Body (16) according to claim 8, wherein the second element (18) is elastically deformable so as to allow the axial displacement of the tooth zone (28) relative to the ramp (23) of the first element (17). by elastic deformation of the second element (18).
10. Organe (16) selon la revendication 8 ou 9, dans lequel le premier élément (17) comporte des pattes (26) s'étendant depuis le reste du premier élément annulaire (17), radialement vers l'extérieur.  10. Body (16) according to claim 8 or 9, wherein the first member (17) comprises lugs (26) extending from the remainder of the first annular element (17), radially outwardly.
1 1 . Organe (16) selon l'une des revendications 8 à 10, dans lequel il comprend un troisième élément (19), dit élément d'équilibrage, fixé au premier élément (17) et diamétralement opposé au deuxième élément (18) par rapport à l'axe du premier élément (17). 1 1. Body (16) according to one of claims 8 to 10, wherein it comprises a third element (19), said element balancing device, fixed to the first element (17) and diametrically opposed to the second element (18) relative to the axis of the first element (17).
12. Organe (16) selon l'une des revendications 8 à 1 1 , dans lequel le deuxième élément (18) et/ou le troisième élément (19) sont fixés aux pattes (26) du premier élément (17), par exemple par rivetage.  12. Body (16) according to one of claims 8 to 11, wherein the second element (18) and / or the third element (19) are fixed to the tabs (26) of the first element (17), for example by riveting.
13. Organe (16) selon la revendication 1 1 ou 12, dans lequel le premier élément (17) et le troisième élément (19) viennent de matière en une seule pièce.  13. Body (16) according to claim 1 1 or 12, wherein the first element (17) and the third element (19) come from one-piece material.
14. Mécanisme d'embrayage (1 ), notamment pour véhicule automobile, comportant  14. Clutch mechanism (1), in particular for a motor vehicle, comprising
- un couvercle fixe (2),  a fixed cover (2),
- un plateau de pression (4) mobile axialement par rapport au couvercle (2),  a pressure plate (4) movable axially with respect to the lid (2),
- un diaphragme (9) mobile entre une position embrayée et une position débrayée, apte à actionner le déplacement du plateau de pression - A diaphragm (9) movable between an engaged position and a disengaged position, able to actuate the displacement of the pressure plate
(4), (4)
- des moyens de rattrapage d'usure comportant au moins un organe de rattrapage d'usure (16) selon l'une des revendications 8 à 13, intercalé axialement entre le diaphragme (9) et le plateau de pression (4), la rampe (23) dudit organe (16) coopérant avec une contre-rampe (23a) du mécanisme (1 ), de façon à ce que la rotation de la rampe (23) par rapport à la contre-rampe (23a) modifie la distance axiale entre le diaphragme (9) et le plateau de pression (4), et des moyens d'entraînement en rotation de l'organe de rattrapage d'usure (16), lesdits moyens d'entraînement en rotation comportant au moins une vis sans fin (37) engrenant avec la zone dentée (28) de l'organe de rattrapage d'usure (16).  - Wear compensating means comprising at least one wear compensating member (16) according to one of claims 8 to 13, interposed axially between the diaphragm (9) and the pressure plate (4), the ramp (23) of said member (16) cooperating with a counter-ramp (23a) of the mechanism (1), so that the rotation of the ramp (23) relative to the counter-ramp (23a) changes the axial distance between the diaphragm (9) and the pressure plate (4), and means for rotating the wear compensating member (16), said rotary drive means comprising at least one worm (37) meshing with the tooth zone (28) of the wear-compensating member (16).
15. Dispositif d'embrayage comprenant un mécanisme d'embrayage (1 ) selon la revendication 14, caractérisé en ce qu'il comporte un plateau de réaction (3), un disque de friction (5) intercalé axialement entre le plateau de pression (4) et le plateau de réaction (3) de façon à pouvoir être serré entre le plateau de pression (4) et le plateau de réaction (3) en position embrayée et de façon à pouvoir être libéré en position débrayée, le couvercle (2) étant fixe par rapport au plateau de réaction (3). Clutch device comprising a clutch mechanism (1) according to claim 14, characterized in that it comprises a reaction plate (3), a friction disc (5) interposed axially between the pressure plate ( 4) and the reaction plate (3) so that it can be clamped between the pressure plate (4) and the reaction plate (3) in the engaged position and releasable in the disengaged position, the cover (2) being fixed relative to the reaction plate (3).
PCT/EP2017/082713 2016-12-19 2017-12-13 Method for manufacturing a wear compensation member for a clutch mechanism WO2018114546A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1662708 2016-12-19
FR1662708A FR3060685B1 (en) 2016-12-19 2016-12-19 METHOD FOR MANUFACTURING A WEAR RETRIEVAL MEMBER FOR A CLUTCH MECHANISM

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3084417B1 (en) * 2018-07-26 2021-11-26 Valeo Embrayages WEAR RETREATCH CLUTCH MECHANISM

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2847626A1 (en) 2002-11-25 2004-05-28 Valeo Embrayages Friction clutch for automobile vehicle, has reaction plate with axial action between lid and pressure plate interdependent on lid rotation, and circumferentially laid ramp placed axially between support and pressure plate
FR2907865A1 (en) * 2006-10-30 2008-05-02 Valeo Embrayages Friction clutch for motor vehicle, has ramp band carried against and centered with respect to annular internal bore of pressure plate, and attachments and tongues distributed on periphery of ramp band
DE102008003989A1 (en) * 2007-01-27 2008-07-31 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Self adjusting friction clutch, has spring lever supported by ramp ring at pressure plate, and worm gear provided radially outside of function circuit, and counter-tooth formed at extension arm of ring, where lever is mounted at plate
DE102009007828A1 (en) * 2008-03-03 2009-09-10 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Friction clutch for dual clutch provided between drive motor and gear i.e. worm gear, has ring part accommodated in centering areas that are distributed over periphery and radially outwardly and inwardly centered on pressure plate
DE102011018592A1 (en) * 2010-05-25 2011-12-01 Schaeffler Technologies Gmbh & Co. Kg Friction clutch with path-controlled wear compensation and method for its assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2847626A1 (en) 2002-11-25 2004-05-28 Valeo Embrayages Friction clutch for automobile vehicle, has reaction plate with axial action between lid and pressure plate interdependent on lid rotation, and circumferentially laid ramp placed axially between support and pressure plate
FR2907865A1 (en) * 2006-10-30 2008-05-02 Valeo Embrayages Friction clutch for motor vehicle, has ramp band carried against and centered with respect to annular internal bore of pressure plate, and attachments and tongues distributed on periphery of ramp band
DE102008003989A1 (en) * 2007-01-27 2008-07-31 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Self adjusting friction clutch, has spring lever supported by ramp ring at pressure plate, and worm gear provided radially outside of function circuit, and counter-tooth formed at extension arm of ring, where lever is mounted at plate
DE102009007828A1 (en) * 2008-03-03 2009-09-10 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Friction clutch for dual clutch provided between drive motor and gear i.e. worm gear, has ring part accommodated in centering areas that are distributed over periphery and radially outwardly and inwardly centered on pressure plate
DE102011018592A1 (en) * 2010-05-25 2011-12-01 Schaeffler Technologies Gmbh & Co. Kg Friction clutch with path-controlled wear compensation and method for its assembly

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FR3060685A1 (en) 2018-06-22

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