WO2000039481A1 - Torsional damper for friction clutch, in particular for motor vehicle - Google Patents

Torsional damper for friction clutch, in particular for motor vehicle Download PDF

Info

Publication number
WO2000039481A1
WO2000039481A1 PCT/FR1999/003045 FR9903045W WO0039481A1 WO 2000039481 A1 WO2000039481 A1 WO 2000039481A1 FR 9903045 W FR9903045 W FR 9903045W WO 0039481 A1 WO0039481 A1 WO 0039481A1
Authority
WO
WIPO (PCT)
Prior art keywords
washer
web
friction
hub
damper
Prior art date
Application number
PCT/FR1999/003045
Other languages
French (fr)
Inventor
Xavier Fesselet
Gérard Lefevre
Original Assignee
Valeo
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 filed Critical Valeo
Priority to MXPA00008214A priority Critical patent/MXPA00008214A/en
Priority to HU0101085A priority patent/HU222141B1/en
Priority to DE19982945T priority patent/DE19982945B4/en
Publication of WO2000039481A1 publication Critical patent/WO2000039481A1/en

Links

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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
    • F16F15/123—Wound springs
    • F16F15/1238—Wound springs with pre-damper, i.e. additional set of springs between flange of main damper and hub

Definitions

  • Torsional damper for a friction clutch in particular for a motor vehicle
  • the invention relates to a torsional damper for a friction clutch, in particular for a motor vehicle.
  • a torsion damper of the type concerned by the invention comprises a main damper interposed between an input element such as a friction disc and an annular web surrounding a hub of a driven shaft, teeth formed on the hub and on the web to mesh with each other with a circumferential clearance, and a pre-damper interposes between the web and the hub and comprising an annular ring integral with rotation of the web and delimiting with the hub of the housings for elastic members with circumferential action, such as for example springs.
  • the pre-shock absorber absorbs vibrations at idle speed of an internal combustion engine.
  • the elastic members of the pre-damper are compressed and the toothing of the web abuts on that of the hub, the cnocs of these toothing can be relatively îi ⁇ portant ⁇ .
  • a friction washer also called hysteresis washer or drawer washer
  • this friction washer or drawer washer is first driven in rotation by the annular web at idle speed, then when the transmitted torque increases, its toothing abuts that of the hub while that of the annular web is further removed from the toothing of the hub. From this moment, the abutment of the teeth of the web on that of the hub is slowed down by the friction of the web on the drawer washer, which reduces the impacts between the teeth of the web and the hub and avoids the corresponding noises.
  • this drawer washer is clamped between the annular web and a friction ring which is interposed between the web and a guide washer integral with the friction disc, and which is subjected to the elastic force developed by a Belleville washer placed between this friction ring and this guide washer, the friction of the ring on the web being intended to dampen the vibrations and the torque oscillations absorbed by the main damper.
  • a Belleville washer placed between this friction ring and this guide washer, the friction of the ring on the web being intended to dampen the vibrations and the torque oscillations absorbed by the main damper.
  • it is the same elastic force developed by the aforementioned Belleville washer which is used to create the friction of the drawer washer on the annular web and that of the friction ring on the annular web or on the guide washer integral with the friction disc, while the phenomena intended to be damped by this friction are very different in intensity and energy.
  • the drawer washer rubbing on the annular web during operation of the pre-damper is associated with a distribution washer and an elastic washer such as a Belleville washer and this stack of three washers is clamped axially between the web annular and a friction ring interposed between this veil and a guide washer integral with the friction disc, to dampen the vibrations and oscillations absorbed by one main damper.
  • an elastic washer such as a Belleville washer
  • this stack of three washers is clamped axially between the web annular and a friction ring interposed between this veil and a guide washer integral with the friction disc, to dampen the vibrations and oscillations absorbed by one main damper.
  • Belleville and / or Belleville washer on the friction ring when the teeth of the drawer washer are in abutment on that of the hub, the abutment of the teeth of the web on that of the hub can produce unpleasant noises, due to the friction of the distribution washer on the washer. Belleville and / or Belleville washer on the friction ring.
  • the object of the invention is in particular to avoid the drawbacks of these known embodiments, while retaining their advantages without increasing the complexity or the cost of the torsional damper.
  • a torsional damper for a friction clutch in particular for a motor vehicle, comprising a main damper interposed between an input element such as a friction disc and an annular web surrounding a hub of a driven shaft, teeth formed on the hub and on the web to mesh with a circumferential clearance, a pre-damper interposed between the web and the hub and comprising an annular ring integral in rotation with the web and delimiting with the hub of the housings for elastic members with circumferential action, and an elastic washer for applying a friction washer to the annular web, the two washers being axially interposed between the web and the annular ring of the pre-shock absorber, the friction washer comprising meshing teeth with that of the hub with a circumferential clearance less than the aforementioned clearance for braking the impacts of the toothing of the web on that the hub, characterized in that said elastic washer is integral in rotation with the annular ring of the pre-damper and comprises a bearing face on the friction washer and radial fingers, applied
  • the elastic washer acting on the friction washer is integral in rotation with the annular ring of the pre-shock absorber and cannot therefore rub on the latter when the teeth of the annular web come into abutment on that of the hub.
  • the force of application of the friction washer on the annular web is determined by the elastic washer associated with this friction washer and not by the Belleville washer associated with the friction ring of the main damper.
  • the radial fingers of the elastic washer form spring blades, determining the bearing force of the friction washer on the web.
  • the abovementioned annular ring and the elastic washer are rotationally secured by the radial fingers of the elastic washer, which cooperate by abutment with recesses and / or protrusions of an end face of this annular ring.
  • the radial fingers of the elastic washer thus have a multiple function of elastic support on the annular ring and of connection in rotation with it, and the force exerted by the elastic washer is determined by the depth of the hollows of the face of end of the annular ring which receive the radial fingers of the elastic washer. By adjusting the depth of these hollows, the elastic force exerted by the washer is adjusted.
  • the radial fingers of the elastic washer are grouped in pairs and extend, in each pair, on either side of an axial stud formed projecting on a face of end of the ring to secure it in rotation with the aforementioned veil.
  • the bearing face of the elastic washer on the friction washer is convex, for example of toric shape.
  • the abovementioned annular ring constitutes a friction member clamped between the annular web and a guide washer on which the clutch friction disc is fixed, and it comprises an axial peripheral rim of pressing on the annular web, this peripheral rim defining a cylindrical housing in which the elastic washer and the abovementioned friction washer are received.
  • FIG. 1 is a schematic view in axial section of a torsional damper according to the invention with local cutaway of the guide washer adjacent to the annular ring of the preamplifier to better show it;
  • - Figure 2 is an exploded perspective view of the annular ring, the elastic washer and the friction washer 1 according to the invention;
  • FIG. 3 is a schematic half-view, in radial section, to explain the operation of the friction washer
  • FIG. 4 is a partial schematic view in axial section of an alternative embodiment of the invention.
  • a friction clutch in particular for a motor vehicle, comprises a disc carrying friction linings which are normally clamped between a flywheel connected to the motor shaft and a pressure plate controlled by a clutch mechanism, for transmit a torque to a driven shaft, such as for example the input shaft of a gearbox.
  • a torsional damper is interposed between the friction disc and the driven shaft to absorb vibrations and torque oscillations, and generally comprises a main damper 10 which is interposed between the disc 12 carrying the friction linings and an annular web 14 surrounding a hub 16 integral in rotation with the driven shaft 18, and a pre-damper 20 acting between the annular web 14 and the hub 16.
  • the annular web 14 comprises an internal peripheral toothing 22 which meshes with a predetermined circumferential clearance with an external peripheral toothing 24 of the hub 16 (FIG. 3) and elastic members with circumferential action, such as helical springs 26 of low stiffness (FIG. 1 ), are interposed between the annular web 14 and the hub 16 to absorb vibrations at the idle speed of the internal combustion engine with which the clutch is associated.
  • high stiffness helical springs 28 are interposed between the annular web 14 and the friction disc 12 to absorb vibrations and torque oscillations at other engine operating speeds. More specifically, the springs 28 are housed in elongated openings 30 of the web 14 and are held in openings formed in two parallel guide washers 32 and 34, located on either side of the web 14 and rigidly connected one to the other. the other by columns not shown, one 32 of these guide washers carrying the disc 12 which is fixed at its internal periphery to this washer 32.
  • the lights 30 of the web and the openings (here in the form of windows) of the guide washers 32, 34 can be replaced respectively by notches open towards the outside and by stampings.
  • the springs 26 of the pre-damper 20 are received in housings in the form of notches open radially on one side, which are delimited, on the one hand, by an internal toothing of an annular ring 36 integral with rotation of the web 14 and, on the other hand, by an external toothing of a ring 38 mounted fixed in rotation on the hub 16, this ring 38 also serving as a conical bearing for supporting and guiding the washer 32 on which is fixed the friction disc 12.
  • this torsional damper operates as follows:
  • the friction disc 12 and its guide washers 32 and 34 are integral in rotation with the web 14, due to the high stiffness of the springs 28, and the rotation of the web 14 is transmitted to the hub 16 of the driven shaft 18 by means of the springs 26 of the pre-damper 20, which absorb vibrations.
  • the springs 26 of the pre-damper are compressed until the toothing 22 of the web 14 comes to bear on the external toothing 24 of the hub 16 which is then linked in rotation to the wall 14, the vibrations and the torque oscillations then being absorbed by the springs 28 of the main damper until these springs are at their maximum, the wall 14 then becoming linked in rotation to the guide washers 32 and 34 and to the friction disc 12.
  • it is the connecting columns of the washers 32, 34 which limit the angular clearance between the web and these washers.
  • a flat friction washer or drawer washer 40 is associated with the annular web 14 to brake the impacts of its toothing 22 on the toothing 24 of the hub 16, which are caused by an increase in the torque transmitted by 1 ' clutch.
  • the washer 40 surrounds the toothing 24 of the hub 16 and itself comprises at its internal periphery a toothing 42 which meshes with the toothing 24 of the hub, with a predetermined circumferential clearance less than the circumferential clearance between the toothing 22 and 24 of the web 14 and of the hub 16, coittne can be seen in Figure 3.
  • This washer 40 which is interposed between the web 14 and the pre-damper 20, is applied to the web by an elastic washer 44 of the Belleville washer type.
  • the washer 44 bears, at its outer periphery, on the annular ring 36 of the pre-damper 20 and, at its internal periphery, on the drawer washer 40 to apply it elastically to the annular web 14.
  • the external periphery of the elastic washer 44 is formed with radial fingers 46, grouped in pairs as shown in FIG. 2, which are folded or bent in the form of a dihedron, the subjects of which are turned towards the annular ring 36, and which engage , with a substantially zero circumferential clearance, on either side of axial studs 48 projecting from an end face of the ring 36 to secure it in rotation with the web 14, these studs 48 being engaged in corresponding orifices veil.
  • the radial fingers 46 of the washer 44 form spring blades and determine most of the elasticity of this washer.
  • the pins 48 of the ring 36 have lateral flats, forming surfaces for guiding the fingers 46 of the washer 44.
  • the elastic washer 44 is of curved shape in the radial direction, for example of toroidal shape, its bearing face on the support washer 40 being convex.
  • the end face of the ring 36 facing the annular web 14 is formed with an axial peripheral rim 50 delimiting a cylindrical housing 52 in which are received the elastic washer 44 and the drawer washer 40, this which allows the latter to be applied to the annular web 14 without being compressed axially by the ring 36 and therefore being subjected only to the axial force developed by the elastic washer 44.
  • Cutouts 54 are formed in the rim 50 for the passage of the radial fingers 46 of the washer 44, these cutouts opening onto planar radial surfaces 56 of the ring 36, extending on either side of the pins 48 and serving as bearing faces at the tops of the dihedrons formed by the fingers 46.
  • the depth of the cutouts 54 makes it possible to adjust the elastic load exerted by the washer 44.
  • the annular ring 36 is clamped axially between the annular web 14 and the disc guide washer 32, by means of a friction washer 58 and a Belleville washer 60 interposed between the annular web 14 and the other guide washer 32.
  • Another friction washer 62 associated with another Belleville washer 64 is provided between the second guide washer 34 and an end face of the hub 16, the washers 62, 64 being surrounded by the washers 58, 60.
  • the operation of the drawer washer 40 is as follows:
  • the toothing 22 of the web 14 and the toothing 42 of the slide washer 40 remain spaced from the toothing 24 of the hub 16, as shown in FIG. 3.
  • the springs 26 of the pre-damper are tablets and the teeth 22 of the web 14 and 42 of the slide washer 40 move in the direction indicated by the arrow in FIG. 3, relative to the hub 16, the slide washer 40 being applied under pressure to the annular web 14 by the washer elastic 44 which is integral in rotation with the annular ring 36 itself integral in rotation with the web 14, so that, under these conditions, the drawer washer 40 is integral in rotation with the web 14.
  • the toothing 22 approaches the toothing 24 of the hub 16 until it abuts thereon, but this movement is slowed down by the friction of the web 14 on the drawer washer 40, the importance this friction being determined by the axial force developed by the elastic washer 44.
  • the friction of the washer 62 on the end face of the hub 16 also contributes to slowing down the rotation of the annular web 14 relative to the hub 16.
  • the annular ring 36 is made of moldable plastic
  • the ring 38 is made of moldable plastic or of sintered material
  • the washers 40 and 44 are metallic, like the annular web 14, which makes it possible to obtain a strong coefficient of friction by metal to metal contact and significant braking of the web 14.
  • the cutouts 54 of the flange 50 allow the elastic washer 44 and the friction washer 40 to be housed inside the ring 36.
  • the number of springs 26 and 28 mentioned above depends on the applications. In the embodiment described and shown, four springs 26 are provided and are arranged in four housings (not referenced) of the ring 36 ( Figure 2).
  • the hub 16 is the output element of the torsion damper, the input element of which is the disc 12 fitted with friction linings.
  • the disc 12 or an extension of the guide washer 32 can be fixed directly to the flywheel.
  • the ring 38 of the pre-shock absorber meshes with the toothing 24 of the hub 16 by means of axial tabs extending in the notches defined by the toothing 24, the outside diameter of which is equal to that of the ring 38 and its axial lugs.
  • the pre-damper only comprises an annular ring 136 made of a moldable material such as plastic and comprising axial pins 148 for rotationally connecting with the annular web 114, these nipples 148 penetrating into notches or notches 149 formed in the windows 130 of the web (which makes it possible to remove the holes formed in the veil 14 for the reception of the pins 48 of the embodiment of Figures 1 to 3).
  • These nipples 148 are profiled externally to match the shape of the springs 128. It will also be noted that, in the embodiment of FIG.
  • the arrangement of the washers 162 and 164 is reversed with respect to that of FIG. 1, and that the washer 158 is locked in rotation on the springs 128 of the main damper and has for this purpose at least one radial arm 159 which penetrates into a window 130 of the web 114.
  • the hub 116 is stage in diameter at its outer periphery to form notches for housing the springs 126 of the preamplifier and has a toothing 124 of reduced axial length meshing with the toothing 122 of the web 114.
  • the ring 136 forms a bearing and cooperates with a flange radially inner cylindrical of the guide washer 132.
  • the ring 136 is also formed with an internal frustoconical bearing which cooperates with a complementary frustoconical portion of the hub 116.
  • the friction washer 140 is applied to the web 114 by the elastic washer 144 in the form Belleville washer which has radial fingers 146 elastically deformable forming a spring and extending in cutouts 154 of an axial peripheral flange 150 of the ring 136, this flange 150 bearing on the web 114.
  • the mode of embodiment of FIG. 4 corresponds to that of FIGS. 1 to 3 and the operation is identical to that previously d written.
  • the annular ring 36 is metallic so that the pins 48 are replaced by lugs of axial orientation taking into account that the ring is then thinner.
  • the ring 136 can also be metallic except at its internal periphery forming a bearing. In this case at least one face, depending on the applications, is covered with a plastic layer for rubbing on the guide washer 132 or the frustoconical bearing of the hub.

Abstract

The invention concerns a torsional damper for friction clutch, in particular for motor vehicle, comprising a main damper (10) interposed between the friction disc (12) and a ring-shaped disc (14), and a pre-damper (20) interposed between the disc (14) and the hub (16) of the output shaft (18), a friction washer (40) being pressed on the disc (14) to brake its rotation relatively to the hub (16) by an elastic washer (44) locked in rotation with the annular ring (36) of the pre-damper (20).

Description

Amortisseur de torsion pour un embrayage à friction, en particulier pour véhicule automobile Torsional damper for a friction clutch, in particular for a motor vehicle
L ' invention concerne un amortisseur de torsion pour un embrayage à friction, en particulier pour véhicule automobile.The invention relates to a torsional damper for a friction clutch, in particular for a motor vehicle.
De façon connue et conrne décrit dans le document EP-0 488 859, un amortisseur de torsion du type concerné par 1 ' invention comprend un amortisseur principal interposé entre un élément d' entrée tel qu'un disque de friction et un voile annulaire entourant un moyeu d'un arbre mené, des dentures formées sur le moyeu et sur le voile pour engrener l'une avec l'autre avec un jeu circonferentiel , et un pré-amortisseur interpose entre le voile et le moyeu et comprenant une bague annulaire solidaire en rotation du voile et délimitant avec le moyeu des logements pour des organes élastiques à action circonferentielle, tels par exemple que des ressorts.In a known and conrne manner described in the document EP-0 488 859, a torsion damper of the type concerned by the invention comprises a main damper interposed between an input element such as a friction disc and an annular web surrounding a hub of a driven shaft, teeth formed on the hub and on the web to mesh with each other with a circumferential clearance, and a pre-damper interposes between the web and the hub and comprising an annular ring integral with rotation of the web and delimiting with the hub of the housings for elastic members with circumferential action, such as for example springs.
Le pre-amortisseur permet d'absorber les vibrations au régime de ralenti d'un moteur a combustion interne. Quand le couple transmis par l'embrayage augmente, les organes élastiques du préamortisseur sont comprimes et la denture du voile vient buter sur celle du moyeu, les cnocs de ces dentures pouvant être relativement îiπportantΞ . Pour amortir ces chocs, on a prévu une rondelle de frottement (également appelée rondelle d'hystérésis ou rondelle tiroir) qui est en appui élastique sur une face radiale du voile annulaire et qui comporte une denture engrenant avec celle du moyeu, avec un jeu circonferentiel inférieur à celui qui est prévu entre les dentures du moyeu et du voile.The pre-shock absorber absorbs vibrations at idle speed of an internal combustion engine. When the torque transmitted by the clutch increases, the elastic members of the pre-damper are compressed and the toothing of the web abuts on that of the hub, the cnocs of these toothing can be relatively îiπportantΞ. To absorb these shocks, a friction washer (also called hysteresis washer or drawer washer) is provided which is in elastic support on a radial face of the annular web and which has a toothing meshing with that of the hub, with a circumferential clearance lower than that which is provided between the teeth of the hub and of the web.
Ainsi, cette rondelle de frottement ou rondelle tiroir est d'abord entraînée en rotation par le voile annulaire au régime de ralenti, puis quand le couple transmis augmente, sa denture vient buter sur celle du moyeu alors que celle du voile annulaire est encore écartée de la denture du moyeu. A partir de ce moment, la venue en butée de la denture du voile sur celle du moyeu est freinée par le frottement du voile sur la rondelle tiroir, ce qui réduit les chocs entre les dentures du voile et du moyeu et évite les bruits correspondants .Thus, this friction washer or drawer washer is first driven in rotation by the annular web at idle speed, then when the transmitted torque increases, its toothing abuts that of the hub while that of the annular web is further removed from the toothing of the hub. From this moment, the abutment of the teeth of the web on that of the hub is slowed down by the friction of the web on the drawer washer, which reduces the impacts between the teeth of the web and the hub and avoids the corresponding noises.
Dans certaines réalisations, cette rondelle tiroir est serrée entre le voile annulaire et une bague de frottement qui est interposée entre le voile et une rondelle de guidage solidaire du disque de friction, et qui est soumise à la force élastique développée par une rondelle Belleville placée entre cette bague de frottement et cette rondelle de guidage, le frottement de la bague sur le voile étant destiné à amortir les vibrations et les oscillations de couple absorbées par l'amortisseur principal. Dans ce cas, c'est la même force élastique développée par la rondelle Belleville précitée qui sert a créer le frottement de la rondelle tiroir sur le voile annulaire et celui de la bague de frottement sur le voile annulaire ou sur la rondelle de guidage solidaire du disque de friction, alors que les phénomènes destinés à être amortis par ces frottements sont très différents en intensité et en énergie.In certain embodiments, this drawer washer is clamped between the annular web and a friction ring which is interposed between the web and a guide washer integral with the friction disc, and which is subjected to the elastic force developed by a Belleville washer placed between this friction ring and this guide washer, the friction of the ring on the web being intended to dampen the vibrations and the torque oscillations absorbed by the main damper. In this case, it is the same elastic force developed by the aforementioned Belleville washer which is used to create the friction of the drawer washer on the annular web and that of the friction ring on the annular web or on the guide washer integral with the friction disc, while the phenomena intended to be damped by this friction are very different in intensity and energy.
Dans une autre réalisation, la rondelle tiroir frottant sur le voile annulaire lors du fonctionnement du pré-amortisseur, est associée à une rondelle de répartition et une rondelle élastique telle qu'une rondelle Belleville et cet empilement de trois rondelles est serré axialement entre le voile annulaire et une bague de frottement interposée entre ce voile et une rondelle de guidage solidaire du disque de friction, pour amortir les vibrations et oscillations absorbées par 1 ' amortisseur principal . Dans ce cas, lorsque la denture de la rondelle tiroir est en butée sur celle du moyeu, la venue en butée de la denture du voile sur celle du moyeu peut produire des bruits désagréables, du fait du frottement de la rondelle de répartition sur la rondelle Belleville et/ou de la rondelle Belleville sur la bague de frottement.In another embodiment, the drawer washer rubbing on the annular web during operation of the pre-damper, is associated with a distribution washer and an elastic washer such as a Belleville washer and this stack of three washers is clamped axially between the web annular and a friction ring interposed between this veil and a guide washer integral with the friction disc, to dampen the vibrations and oscillations absorbed by one main damper. In this case, when the teeth of the drawer washer are in abutment on that of the hub, the abutment of the teeth of the web on that of the hub can produce unpleasant noises, due to the friction of the distribution washer on the washer. Belleville and / or Belleville washer on the friction ring.
L'invention a notamment pour but d'éviter les inconvénients de ces réalisations connues, tout en conservant leurs avantages respectifs et sans augmenter pour autant la complexité ou le coût de l'amortisseur de torsion.The object of the invention is in particular to avoid the drawbacks of these known embodiments, while retaining their advantages without increasing the complexity or the cost of the torsional damper.
Elle propose, à cet effet un amortisseur de torsion pour un embrayage à friction, en particulier pour véhicule automobile, comprenant un amortisseur principal interposé entre un élément d' entrée tel qu'un disque de friction et un voile annulaire entourant un moyeu d'un arbre mené, des dentures formées sur le moyeu et sur le voile pour engrener avec un jeu circonferentiel, un pré-amortisseur interposé entre le voile et le moyeu et comprenant une bague annulaire solidaire en rotation du voile et délimitant avec le moyeu des logements pour des organes élastiques à action circonférentielle, et une rondelle élastique d'application d'une rondelle de frottement sur le voile annulaire, les deux rondelles étant axialement interposées entre le voile et la bague annulaire du pré-amortisseur, la rondelle de frottement comprenant une denture engrenant avec celle du moyeu avec un jeu circonferentiel inférieur au jeu précité pour freiner les chocs de la denture du voile sur celle du moyeu, caractérisé en ce que ladite rondelle élastique est solidaire en rotation de la bague annulaire du pré-amortisseur et comprend une face d'appui sur la rondelle de frottement et des doigts radiaux, appliqués sur ladite bague annulaire.To this end, it provides a torsional damper for a friction clutch, in particular for a motor vehicle, comprising a main damper interposed between an input element such as a friction disc and an annular web surrounding a hub of a driven shaft, teeth formed on the hub and on the web to mesh with a circumferential clearance, a pre-damper interposed between the web and the hub and comprising an annular ring integral in rotation with the web and delimiting with the hub of the housings for elastic members with circumferential action, and an elastic washer for applying a friction washer to the annular web, the two washers being axially interposed between the web and the annular ring of the pre-shock absorber, the friction washer comprising meshing teeth with that of the hub with a circumferential clearance less than the aforementioned clearance for braking the impacts of the toothing of the web on that the hub, characterized in that said elastic washer is integral in rotation with the annular ring of the pre-damper and comprises a bearing face on the friction washer and radial fingers, applied to said annular ring.
Dans cet amortisseur, la rondelle élastique agissant sur la rondelle de frottement est solidaire en rotation de la bague annulaire du pré-amortisseur et ne peut donc frotter sur celle-ci quand la denture du voile annulaire vient en butée sur celle du moyeu. De plus, la force d'application de la rondelle de frottement sur le voile annulaire est déterminée par la rondelle élastique associée à cette rondelle de frottement et non pas par la rondelle Belleville associée à la bague de frottement de 1 ' amortisseur principal .In this shock absorber, the elastic washer acting on the friction washer is integral in rotation with the annular ring of the pre-shock absorber and cannot therefore rub on the latter when the teeth of the annular web come into abutment on that of the hub. In addition, the force of application of the friction washer on the annular web is determined by the elastic washer associated with this friction washer and not by the Belleville washer associated with the friction ring of the main damper.
Avantageusement, les doigts radiaux de la rondelle élastique forment des lames de ressort, déterminant la force d'appui de la rondelle de frottement sur le voile. Selon une autre caractéristique de 1 ' invention, la bague annulaire précitée et la rondelle élastique sont solidarisées en rotation par les doigts radiaux de la rondelle élastique, qui coopèrent par butée avec des creux et/ou des saillies d'une face d'extrémité de cette bague annulaire.Advantageously, the radial fingers of the elastic washer form spring blades, determining the bearing force of the friction washer on the web. According to another characteristic of the invention, the abovementioned annular ring and the elastic washer are rotationally secured by the radial fingers of the elastic washer, which cooperate by abutment with recesses and / or protrusions of an end face of this annular ring.
Les doigts radiaux de la rondelle élastique ont ainsi une fonction multiple d'appui élastique sur la bague annulaire et de liaison en rotation avec celle-ci, et la force exercée par la rondelle élastique est déterminée par la profondeur des creux de la face d'extrémité de la bague annulaire qui reçoivent les doigts radiaux de la rondelle élastique. En réglant la profondeur de ces creux, on règle la force élastique exercée par la rondelle.The radial fingers of the elastic washer thus have a multiple function of elastic support on the annular ring and of connection in rotation with it, and the force exerted by the elastic washer is determined by the depth of the hollows of the face of end of the annular ring which receive the radial fingers of the elastic washer. By adjusting the depth of these hollows, the elastic force exerted by the washer is adjusted.
Dans une forme de réalisation préférée de l'invention, les doigts radiaux de la rondelle élastique sont groupés par paires et s'étendent, dans chaque paire, de part et d'autre d'un téton axial formé en saillie sur une face d'extrémité de la bague pour la solidariser en rotation avec le voile précité.In a preferred embodiment of the invention, the radial fingers of the elastic washer are grouped in pairs and extend, in each pair, on either side of an axial stud formed projecting on a face of end of the ring to secure it in rotation with the aforementioned veil.
On tire alors parti des organes qui solidarisent en rotation la bague annulaire et le voile annulaire précités pour solidariser en rotation la rondelle élastique avec la bague annulaire.This then takes advantage of the members which secure in rotation the annular ring and the abovementioned annular web in order to secure in rotation the elastic washer with the annular ring.
Avantageusement, la face d'appui de la rondelle élastique sur la rondelle de frottement est convexe, par exemple de forme torique.Advantageously, the bearing face of the elastic washer on the friction washer is convex, for example of toric shape.
Cela permet un appui élastique correct de la rondelle de frottement sur le voile annulaire tout en réduisant les frottements entre cette face de la rondelle élastique et la rondelle de frottement.This allows correct elastic support of the friction washer on the annular web while reducing friction between this face of the elastic washer and the friction washer.
Dans l'amortisseur selon l'invention, la bague annulaire précitée constitue un organe de frottement serré entre le voile annulaire et une rondelle de guidage sur laquelle est fixé le disque de friction de l'embrayage, et elle comporte un rebord périphérique axial d'appui sur le voile annulaire, ce rebord périphérique délimitant un logement cylindrique dans lequel sont reçues la rondelle élastique et la rondelle de frottement précitées. Cette solution intéressante par sa compacité axiale facilite le montage de la rondelle élastique et de la rondelle de frottement dans 1 ' amortisseur selon 1 ' invention et évite en outre toute interférence entre la rondelle de frottement et la bague annulaire précitée.In the damper according to the invention, the abovementioned annular ring constitutes a friction member clamped between the annular web and a guide washer on which the clutch friction disc is fixed, and it comprises an axial peripheral rim of pressing on the annular web, this peripheral rim defining a cylindrical housing in which the elastic washer and the abovementioned friction washer are received. This interesting solution by its axial compactness facilitates the mounting of the elastic washer and of the friction washer in the damper according to the invention and furthermore avoids any interference between the friction washer and the abovementioned annular ring.
L'invention sera mieux comprise et d'autres caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement à la lecture de la description qui suit, faite à titre d'exemple en référence aux dessins annexés dans lesquels :The invention will be better understood and other characteristics, details and advantages thereof will appear more clearly on reading the description which follows, given by way of example with reference to the appended drawings in which:
- la figure 1 est une vue schématique en coupe axiale d'un amortisseur de torsion selon 1 ' invention avec arrachement local de la rondelle de guidage adjacente à la bague annulaire du préamortisseur pour mieux montrer celle-ci ; - la figure 2 est une vue en perspective éclatée de la bague annulaire, de la rondelle élastique et de la rondelle de frottement selon 1 ' invention ;- Figure 1 is a schematic view in axial section of a torsional damper according to the invention with local cutaway of the guide washer adjacent to the annular ring of the preamplifier to better show it; - Figure 2 is an exploded perspective view of the annular ring, the elastic washer and the friction washer 1 according to the invention;
- la figure 3 est une demi-vue schématique, en coupe radiale, permettant d'expliciter le fonctionnement de la rondelle de frottement ;- Figure 3 is a schematic half-view, in radial section, to explain the operation of the friction washer;
- la figure 4 est une vue schématique partielle en coupe axiale d'une variante de réalisation de l'invention.- Figure 4 is a partial schematic view in axial section of an alternative embodiment of the invention.
De façon très générale, un embrayage a friction, notamment pour véhicule automobile, comprend un disque portant des garnitures de friction qui sont normalement serrées entre un volant relié à 1 ' arbre moteur et un plateau de pression commandé par un mécanisme d' embrayage, pour transmettre un couple de rotation à un arbre mené, tel par exemple que l'arbre d'entrée d'une boîte de vitesses. Un amortisseur de torsion est interposé entre le disque de friction et 1 ' arbre mené pour absorber les vibrations et les oscillations de couple, et coirprend en général un amortisseur principal 10 qui est interposé entre le disque 12 portant les garnitures de friction et un voile annulaire 14 entourant un moyeu 16 solidaire en rotation de l'arbre mené 18, et un pré-amortisseur 20 agissant entre le voile annulaire 14 et le moyeu 16.Very generally, a friction clutch, in particular for a motor vehicle, comprises a disc carrying friction linings which are normally clamped between a flywheel connected to the motor shaft and a pressure plate controlled by a clutch mechanism, for transmit a torque to a driven shaft, such as for example the input shaft of a gearbox. A torsional damper is interposed between the friction disc and the driven shaft to absorb vibrations and torque oscillations, and generally comprises a main damper 10 which is interposed between the disc 12 carrying the friction linings and an annular web 14 surrounding a hub 16 integral in rotation with the driven shaft 18, and a pre-damper 20 acting between the annular web 14 and the hub 16.
Le voile annulaire 14 comprend une denture périphérique interne 22 qui engrène avec un jeu circonferentiel prédéterminé avec une denture périphérique externe 24 du moyeu 16 (figure 3) et des organes élastiques à action circonférentielle, tels que des ressorts hélicoïdaux 26 à faible raideur (figure 1) , sont interposés entre le voile annulaire 14 et le moyeu 16 pour absorber les vibrations au régime de ralenti du moteur à combustion interne auquel est associé 1 ' embrayage.The annular web 14 comprises an internal peripheral toothing 22 which meshes with a predetermined circumferential clearance with an external peripheral toothing 24 of the hub 16 (FIG. 3) and elastic members with circumferential action, such as helical springs 26 of low stiffness (FIG. 1 ), are interposed between the annular web 14 and the hub 16 to absorb vibrations at the idle speed of the internal combustion engine with which the clutch is associated.
De même, des ressorts hélicoïdaux 28 à forte raideur sont interposés entre le voile annulaire 14 et le disque de friction 12 pour absorber les vibrations et les oscillations de couple aux autres régimes de fonctionnement du moteur. Plus précisément, les ressorts 28 sont logés dans des lumières allongées 30 du voile 14 et sont maintenus dans des ouvertures formées dans deux rondelles de guidage 32 et 34 parallèles, situées de part et d'autre du voile 14 et reliées rigidement l'une à l'autre par des colonnettes non représentées, l'une 32 de ces rondelles de guidage portant le disque 12 qui est fixé à sa périphérie interne sur cette rondelle 32.Likewise, high stiffness helical springs 28 are interposed between the annular web 14 and the friction disc 12 to absorb vibrations and torque oscillations at other engine operating speeds. More specifically, the springs 28 are housed in elongated openings 30 of the web 14 and are held in openings formed in two parallel guide washers 32 and 34, located on either side of the web 14 and rigidly connected one to the other. the other by columns not shown, one 32 of these guide washers carrying the disc 12 which is fixed at its internal periphery to this washer 32.
Les lumières 30 du voile et les ouvertures (ici en forme de fenêtres) des rondelles de guidage 32, 34 peuvent être remplacées respectivement par des échancrures ouvertes vers 1 ' extérieur et par des emboutis.The lights 30 of the web and the openings (here in the form of windows) of the guide washers 32, 34 can be replaced respectively by notches open towards the outside and by stampings.
De façon similaire, les ressorts 26 du pré-amortisseur 20 sont reçus dans des logements en forme d' échancrures ouvertes radialement d'un côté, qui sont délimités, d'une part, par une denture interne d'une bague annulaire 36 solidaire en rotation du voile 14 et, d'autre part, par une denture externe d'une bague 38 montée fixe en rotation sur le moyeu 16, cette bague 38 faisant également office de palier conique de support et de guidage de la rondelle 32 sur laquelle est fixé le disque de friction 12. De façon connue, cet amortisseur de torsion fonctionne de la façon suivante :Similarly, the springs 26 of the pre-damper 20 are received in housings in the form of notches open radially on one side, which are delimited, on the one hand, by an internal toothing of an annular ring 36 integral with rotation of the web 14 and, on the other hand, by an external toothing of a ring 38 mounted fixed in rotation on the hub 16, this ring 38 also serving as a conical bearing for supporting and guiding the washer 32 on which is fixed the friction disc 12. In known manner, this torsional damper operates as follows:
Au régime de ralenti du moteur à combustion interne, le disque de friction 12 et ses rondelles de guidage 32 et 34 sont solidaires en rotation du voile 14, en raison de la forte raideur des ressorts 28, et la rotation du voile 14 est transmise au moyeu 16 de l'arbre mené 18 par l'intermédiaire des ressorts 26 du pré-amortisseur 20, qui absorbent les vibrations.At the idle speed of the internal combustion engine, the friction disc 12 and its guide washers 32 and 34 are integral in rotation with the web 14, due to the high stiffness of the springs 28, and the rotation of the web 14 is transmitted to the hub 16 of the driven shaft 18 by means of the springs 26 of the pre-damper 20, which absorb vibrations.
Quand le couple de rotation transmis par l'embrayage augmente, les ressorts 26 du pré-amortisseur sont comprimés jusqu'à ce que la denture 22 du voile 14 vienne en appui sur la denture externe 24 du moyeu 16 qui est alors lié en rotation au voile 14, les vibrations et les oscillations de couple étant alors absorbées par les ressorts 28 de l'amortisseur principal jusqu'à ce que ces ressorts soient coirprimes au maximum, le voile 14 devenant alors lié en rotation aux rondelles de guidage 32 et 34 et au disque de friction 12. En variante, ce sont les colonnettes de liaison des rondelles 32, 34 qui limitent le débattement angulaire entre le voile et ces rondelles . De façon également connue, une rondelle plate de frottement ou rondelle tiroir 40 est associée au voile annulaire 14 pour freiner les chocs de sa denture 22 sur la denture 24 du moyeu 16, qui sont provoqués par une augmentation du couple de rotation transmis par 1 ' embrayage. La rondelle 40 entoure la denture 24 du moyeu 16 et comporte elle-même à sa périphérie interne une denture 42 qui engrène avec la denture 24 du moyeu, avec un jeu circonferentiel prédéterminé inférieur au jeu circonferentiel entre les dentures 22 et 24 du voile 14 et du moyeu 16, coittne on peut le voir sur la figure 3. Cette rondelle 40, qui est interposée entre le voile 14 et le pré-amortisseur 20, est appliquée sur le voile par une rondelle élastique 44 du type rondelle Belleville.When the torque transmitted by the clutch increases, the springs 26 of the pre-damper are compressed until the toothing 22 of the web 14 comes to bear on the external toothing 24 of the hub 16 which is then linked in rotation to the wall 14, the vibrations and the torque oscillations then being absorbed by the springs 28 of the main damper until these springs are at their maximum, the wall 14 then becoming linked in rotation to the guide washers 32 and 34 and to the friction disc 12. As a variant, it is the connecting columns of the washers 32, 34 which limit the angular clearance between the web and these washers. In a manner also known, a flat friction washer or drawer washer 40 is associated with the annular web 14 to brake the impacts of its toothing 22 on the toothing 24 of the hub 16, which are caused by an increase in the torque transmitted by 1 ' clutch. The washer 40 surrounds the toothing 24 of the hub 16 and itself comprises at its internal periphery a toothing 42 which meshes with the toothing 24 of the hub, with a predetermined circumferential clearance less than the circumferential clearance between the toothing 22 and 24 of the web 14 and of the hub 16, coittne can be seen in Figure 3. This washer 40, which is interposed between the web 14 and the pre-damper 20, is applied to the web by an elastic washer 44 of the Belleville washer type.
Selon l'invention, la rondelle 44 prend appui, à sa périphérie externe, sur la bague annulaire 36 du pré-amortisseur 20 et, à sa périphérie interne, sur la rondelle tiroir 40 pour l'appliquer élastiquement sur le voile annulaire 14.According to the invention, the washer 44 bears, at its outer periphery, on the annular ring 36 of the pre-damper 20 and, at its internal periphery, on the drawer washer 40 to apply it elastically to the annular web 14.
La périphérie externe de la rondelle élastique 44 est formée avec des doigts radiaux 46, groupés par paires comme représenté en figure 2, qui sont plies ou coudés en forme de dièdre dont les soumets sont tournés vers la bague annulaire 36, et qui s'engagent, avec un jeu circonferentiel sensiblement nul, de part et d'autre de tétons axiaux 48 formés en saillie sur une face d'extrémité de la bague 36 pour la solidariser en rotation avec le voile 14, ces tétons 48 étant engagés dans des orifices correspondants du voile. Les doigts radiaux 46 de la rondelle 44 forment des lames de ressort et déterminent en majeure partie l'élasticité de cette rondelle. Comme on le voit en figure 2, les tétons 48 de la bague 36 ont des méplats latéraux, formant des surfaces de guidage des doigts 46 de la rondelle 44.The external periphery of the elastic washer 44 is formed with radial fingers 46, grouped in pairs as shown in FIG. 2, which are folded or bent in the form of a dihedron, the subjects of which are turned towards the annular ring 36, and which engage , with a substantially zero circumferential clearance, on either side of axial studs 48 projecting from an end face of the ring 36 to secure it in rotation with the web 14, these studs 48 being engaged in corresponding orifices veil. The radial fingers 46 of the washer 44 form spring blades and determine most of the elasticity of this washer. As seen in FIG. 2, the pins 48 of the ring 36 have lateral flats, forming surfaces for guiding the fingers 46 of the washer 44.
A sa périphérie interne, la rondelle élastique 44 est de forme incurvée en direction radiale, par exemple de forme torique, sa face d'appui sur la rondelle d'appui 40 étant convexe. Dans le mode de réalisation représenté, la face d'extrémité de la bague 36 tournée vers le voile annulaire 14 est formée avec un rebord périphérique axial 50 délimitant un logement cylindrique 52 dans lequel sont reçues la rondelle élastique 44 et la rondelle tiroir 40, ce qui permet à cette dernière d'être appliquée sur le voile annulaire 14 sans être comprimée axialement par la bague 36 et en étant donc soumise uniquement à la force axiale développée par la rondelle élastique 44.At its internal periphery, the elastic washer 44 is of curved shape in the radial direction, for example of toroidal shape, its bearing face on the support washer 40 being convex. In the embodiment shown, the end face of the ring 36 facing the annular web 14 is formed with an axial peripheral rim 50 delimiting a cylindrical housing 52 in which are received the elastic washer 44 and the drawer washer 40, this which allows the latter to be applied to the annular web 14 without being compressed axially by the ring 36 and therefore being subjected only to the axial force developed by the elastic washer 44.
On évite également ainsi tout risque de frottement parasite entre la rondelle tiroir 40 et la bague annulaire 36.This also avoids any risk of parasitic friction between the drawer washer 40 and the annular ring 36.
Des découpes 54 sont formées dans le rebord 50 pour le passage des doigts radiaux 46 de la rondelle 44, ces découpes débouchant sur des surfaces radiales planes 56 de la bague 36, s 'étendant de part et d'autre des tétons 48 et servant de faces d'appui aux sommets des dièdres formés par les doigts 46. La profondeur des découpes 54 permet de régler la charge élastique exercée par la rondelle 44. De façon déjà connue, la bague annulaire 36 est serrée axialement entre le voile annulaire 14 et la rondelle 32 de guidage du disque 12, par l'intermédiaire d'une rondelle de frottement 58 et d'une rondelle Belleville 60 interposée entre le voile annulaire 14 et 1 ' autre rondelle de guidage 32.Cutouts 54 are formed in the rim 50 for the passage of the radial fingers 46 of the washer 44, these cutouts opening onto planar radial surfaces 56 of the ring 36, extending on either side of the pins 48 and serving as bearing faces at the tops of the dihedrons formed by the fingers 46. The depth of the cutouts 54 makes it possible to adjust the elastic load exerted by the washer 44. In a manner already known, the annular ring 36 is clamped axially between the annular web 14 and the disc guide washer 32, by means of a friction washer 58 and a Belleville washer 60 interposed between the annular web 14 and the other guide washer 32.
Une autre rondelle de frottement 62 associée à une autre rondelle Belleville 64 est prévue entre la deuxième rondelle de guidage 34 et une face d'extrémité du moyeu 16, les rondelles 62, 64 étant entourées par les rondelles 58, 60. Dans cet amortisseur de torsion, le fonctionnement de la rondelle tiroir 40 est le suivant :Another friction washer 62 associated with another Belleville washer 64 is provided between the second guide washer 34 and an end face of the hub 16, the washers 62, 64 being surrounded by the washers 58, 60. In this damper of torsion, the operation of the drawer washer 40 is as follows:
Au régime de ralenti, la denture 22 du voile 14 et la denture 42 de la rondelle tiroir 40 restent écartées de la denture 24 du moyeu 16, comme représenté en figure 3. Quand le couple transmis augmente, les ressorts 26 du pré-amortisseur sont comprimés et les dentures 22 du voile 14 et 42 de la rondelle tiroir 40 se déplacent dans le sens indiqué par la flèche en figure 3 , par rapport au moyeu 16, la rondelle tiroir 40 étant appliquée à pression sur le voile annulaire 14 par la rondelle élastique 44 qui est solidaire en rotation de la bague annulaire 36 elle-même solidaire en rotation du voile 14, de sorte que, dans ces conditions, la rondelle tiroir 40 est solidaire en rotation du voile 14.At idle speed, the toothing 22 of the web 14 and the toothing 42 of the slide washer 40 remain spaced from the toothing 24 of the hub 16, as shown in FIG. 3. When the transmitted torque increases, the springs 26 of the pre-damper are tablets and the teeth 22 of the web 14 and 42 of the slide washer 40 move in the direction indicated by the arrow in FIG. 3, relative to the hub 16, the slide washer 40 being applied under pressure to the annular web 14 by the washer elastic 44 which is integral in rotation with the annular ring 36 itself integral in rotation with the web 14, so that, under these conditions, the drawer washer 40 is integral in rotation with the web 14.
Quand le couple transmis augmente, la denture 42 de la rondelle tiroir 40 vient buter sur la denture 24 du moyeu 16, de sorte que la rondelle tiroir 40 devient alors solidaire en rotation du moyeu 16.When the transmitted torque increases, the toothing 42 of the drawer washer 40 abuts on the toothing 24 of the hub 16, so that the drawer washer 40 then becomes integral in rotation with the hub 16.
Quand le couple transmis augmente encore, la denture 22 se rapproche de la denture 24 du moyeu 16 jusqu'à venir en butée sur celle-ci, mais ce mouvement est freiné par le frottement du voile 14 sur la rondelle tiroir 40, 1 ' importance de ce frottement étant déterminée par la force axiale développée par la rondelle élastique 44. Le frottement de la rondelle 62 sur la face d'extrémité du moyeu 16 contribue également à freiner la rotation du voile annulaire 14 par rapport au moyeu 16. Dans cette réalisation, la bague annulaire 36 est en matière plastique moulable, la bague 38 est en matière plastique moulable ou en matériau fritte, et les rondelles 40 et 44 sont métalliques, comme le voile annulaire 14, ce qui permet d'obtenir un fort coefficient de frottement par contact métal sur métal et un freinage important du voile 14.When the transmitted torque increases further, the toothing 22 approaches the toothing 24 of the hub 16 until it abuts thereon, but this movement is slowed down by the friction of the web 14 on the drawer washer 40, the importance this friction being determined by the axial force developed by the elastic washer 44. The friction of the washer 62 on the end face of the hub 16 also contributes to slowing down the rotation of the annular web 14 relative to the hub 16. In this embodiment, the annular ring 36 is made of moldable plastic, the ring 38 is made of moldable plastic or of sintered material, and the washers 40 and 44 are metallic, like the annular web 14, which makes it possible to obtain a strong coefficient of friction by metal to metal contact and significant braking of the web 14.
Les découpes 54 du rebord 50 permettent de loger la rondelle élastique 44 et la rondelle de frottement 40 à 1 ' intérieur de la bague 36. Le nombre des ressorts 26 et 28 précités dépend des applications. Dans le mode de réalisation décrit et représenté, quatre ressorts 26 sont prévus et sont disposés dans quatre logements (non référencés) de la bague 36 (figure 2) .The cutouts 54 of the flange 50 allow the elastic washer 44 and the friction washer 40 to be housed inside the ring 36. The number of springs 26 and 28 mentioned above depends on the applications. In the embodiment described and shown, four springs 26 are provided and are arranged in four housings (not referenced) of the ring 36 (Figure 2).
Le moyeu 16 est 1 ' élément de sortie de 1 'amortisseur de torsion, dont l'élément d'entrée est le disque 12 équipé de garnitures de friction. En variante, le disque 12 ou un prolongement de la rondelle de guidage 32 peut être fixé directement sur le volant moteur.The hub 16 is the output element of the torsion damper, the input element of which is the disc 12 fitted with friction linings. Alternatively, the disc 12 or an extension of the guide washer 32 can be fixed directly to the flywheel.
Dans le mode de réalisation des figures 1 à 3, la bague 38 du pré-amortisseur engrène avec la denture 24 du moyeu 16 grâce à des pattes axiales s ' étendant dans les échancrures définies par la denture 24, dont le diamètre extérieur est égal à celui de la bague 38 et de ses pattes axiales.In the embodiment of FIGS. 1 to 3, the ring 38 of the pre-shock absorber meshes with the toothing 24 of the hub 16 by means of axial tabs extending in the notches defined by the toothing 24, the outside diameter of which is equal to that of the ring 38 and its axial lugs.
Dans la variante de réalisation de la figure 4, où les éléments correspondant à ceux des figures 1 à 3 sont désignés par les mêmes références augmentées d'une centaine, le pré-amortisseur ne comprend qu'une bague annulaire 136 réalisée en une matière moulable telle qu'une matière plastique et comprenant des tétons axiaux 148 de liaison en rotation avec le voile annulaire 114, ces tétons 148 pénétrant dans des échancrures ou encoches 149 formées dans les fenêtres 130 du voile (ce qui permet de supprimer les trous formés dans le voile 14 pour la réception des tétons 48 du mode de réalisation des figures 1 à 3) . Ces tétons 148 sont profilés extérieurement pour épouser la forme des ressorts 128. On notera également que, dans la réalisation de la figure 4, la disposition des rondelles 162 et 164 est inversée par rapport à celle de la figure 1, et que la rondelle 158 est calée en rotation sur les ressorts 128 de l'amortisseur principal et présente à cet effet au moins un bras radial 159 qui pénètre dans une fenêtre 130 du voile 114.In the alternative embodiment of FIG. 4, where the elements corresponding to those of FIGS. 1 to 3 are designated by the same references increased by a hundred, the pre-damper only comprises an annular ring 136 made of a moldable material such as plastic and comprising axial pins 148 for rotationally connecting with the annular web 114, these nipples 148 penetrating into notches or notches 149 formed in the windows 130 of the web (which makes it possible to remove the holes formed in the veil 14 for the reception of the pins 48 of the embodiment of Figures 1 to 3). These nipples 148 are profiled externally to match the shape of the springs 128. It will also be noted that, in the embodiment of FIG. 4, the arrangement of the washers 162 and 164 is reversed with respect to that of FIG. 1, and that the washer 158 is locked in rotation on the springs 128 of the main damper and has for this purpose at least one radial arm 159 which penetrates into a window 130 of the web 114.
Le moyeu 116 est étage en diamètre à sa périphérie externe pour former des échancrures de logement des ressorts 126 du préamortisseur et comporte une denture 124 de longueur axiale réduite engrenant avec la denture 122 du voile 114. La bague 136 forme palier et coopère avec un rebord cylindrique radialement interne de la rondelle de guidage 132. La bague 136 est également formée avec une portée tronconique interne qui coopère avec une partie tronconique complémentaire du moyeu 116. La rondelle de frottement 140 est appliquée sur le voile 114 par la rondelle élastique 144 en forme de rondelle Belleville qui comporte des doigts radiaux 146 élastiquement déformables formant ressort et s 'étendant dans des découpes 154 d'un rebord périphérique axial 150 de la bague 136, ce rebord 150 venant en appui sur le voile 114. Pour le reste, le mode de réalisation de la figure 4 correspond à celui des figures 1 à 3 et le fonctionnement est identique à celui précédemment décrit.The hub 116 is stage in diameter at its outer periphery to form notches for housing the springs 126 of the preamplifier and has a toothing 124 of reduced axial length meshing with the toothing 122 of the web 114. The ring 136 forms a bearing and cooperates with a flange radially inner cylindrical of the guide washer 132. The ring 136 is also formed with an internal frustoconical bearing which cooperates with a complementary frustoconical portion of the hub 116. The friction washer 140 is applied to the web 114 by the elastic washer 144 in the form Belleville washer which has radial fingers 146 elastically deformable forming a spring and extending in cutouts 154 of an axial peripheral flange 150 of the ring 136, this flange 150 bearing on the web 114. For the rest, the mode of embodiment of FIG. 4 corresponds to that of FIGS. 1 to 3 and the operation is identical to that previously d written.
En variante la bague annulaire 36 est métallique en sorte que les tétons 48 sont remplacés par des pattes d'orientation axiale compte tenu que la bague est alors moins épaisse.As a variant, the annular ring 36 is metallic so that the pins 48 are replaced by lugs of axial orientation taking into account that the ring is then thinner.
La bague 136 peut être également métallique sauf à sa périphérie interne faisant palier. Dans ce cas une face au moins selon les applications est recouverte d'une couche en matière plastique pour frotter sur la rondelle de guidage 132 ou la portée tronconique du moyeu.The ring 136 can also be metallic except at its internal periphery forming a bearing. In this case at least one face, depending on the applications, is covered with a plastic layer for rubbing on the guide washer 132 or the frustoconical bearing of the hub.
Ceci est réalisé par exemple par la technique du surmoulage la bague 136 comportant des trous pour ancrage de la matière plastique s'étendant avantageusement de part et d'autre de la bague 136 au niveau du palier et au moins sur la face de la bague 136 tournée vers la rondelle 132 pour contact avec celle-ci . Tout dépend des applications . This is achieved for example by the technique of overmolding the ring 136 comprising holes for anchoring the plastic material advantageously extending on either side of the ring 136 at the level of the bearing and at least on the face of the ring 136 tour towards the washer 132 for contact therewith. It all depends on the applications.

Claims

REVENDICATIONS
1 - Amortisseur de torsion pour un embrayage à friction, en particulier pour véhicule automobile, comprenant un amortisseur principal (10) interposé entre un élément d'entrée tel qu'un disque de friction (12) et un voile annulaire (14, 114) entourant un moyeu (16, 116) d'un arbre mené (18), des dentures (22, 24 ; 122, 124) formées sur le moyeu et sur le voile pour engrener avec un jeu circonferentiel, un pré-amortisseur (20) interposé entre le voile (14, 114) et le moyeu (16, 116) et comprenant une bague annulaire (36, 136) solidaire en rotation du voile et délimitant avec le moyeu des logements pour des organes élastiques (26, 126) à action circonférentielle, et une rondelle élastique (44, 144) d'application d'une rondelle de frottement (40, 140) sur le voile (14, 114) , ces deux rondelles étant axialement interposées entre le voile et la bague annulaire (36, 136) du pré-amortisseur et la rondelle de frottement (40, 140) coπprenant une denture (42, 142) engrenant avec la denture précitée (24, 124) du moyeu avec un jeu circonférentiel inférieur au jeu circonférentiel précité pour freiner les chocs de la denture (22, 122) du voile sur celle du moyeu, caractérisé en ce que ladite rondelle élastique (44, 144) est solidaire en rotation de la bague annulaire (36, 136) du pré-amortisseur et comprend une face d'appui sur la rondelle de frottement (40, 140) et des doigts radiaux (46, 146) , appliqués sur ladite bague annulaire (36, 136) .1 - Torsional damper for a friction clutch, in particular for a motor vehicle, comprising a main damper (10) interposed between an input element such as a friction disc (12) and an annular web (14, 114) surrounding a hub (16, 116) of a driven shaft (18), teeth (22, 24; 122, 124) formed on the hub and on the web to mesh with a circumferential clearance, a pre-damper (20) interposed between the web (14, 114) and the hub (16, 116) and comprising an annular ring (36, 136) integral in rotation with the web and delimiting with the hub of the housings for elastic action members (26, 126) circumferential, and an elastic washer (44, 144) for applying a friction washer (40, 140) to the web (14, 114), these two washers being axially interposed between the web and the annular ring (36, 136) of the pre-damper and the friction washer (40, 140) including a toothing (42, 142) meshing with ec the aforementioned toothing (24, 124) of the hub with a circumferential clearance less than the aforementioned circumferential clearance for braking the impacts of the toothing (22, 122) of the web on that of the hub, characterized in that said elastic washer (44, 144 ) is integral in rotation with the annular ring (36, 136) of the pre-damper and comprises a bearing face on the friction washer (40, 140) and radial fingers (46, 146), applied to said annular ring (36, 136).
2 - Amortisseur selon la revendication 1, caractérisé en ce que la bague annulaire (36, 136) et la rondelle élastique (44, 144) sont solidarisées en rotation par les doigts radiaux (46, 146) de la rondelle élastique, qui coopèrent par butée avec des creux et/ou des saillies d'une face d'extrémité de la bague annulaire (36, 136) .2 - Damper according to claim 1, characterized in that the annular ring (36, 136) and the elastic washer (44, 144) are secured in rotation by the radial fingers (46, 146) of the elastic washer, which cooperate by stop with recesses and / or protrusions on one end face of the annular ring (36, 136).
3 - Amortisseur selon la revendication 1 ou 2, caractérisé en ce que les doigts radiaux (46, 146) de la rondelle élastique forment des lames de ressort. 4 - Amortisseur selon l'une des revendications 1 à 3, caractérisé en ce que les doigts radiaux (46) de la rondelle élastique (44) sont groupés par paires et s'étendent, dans chaque paire, de part et d'autre d'un téton axial (48) formé en saillie sur une face d'extrémité de la bague (36) pour la solidariser en rotation avec le voile (14) .3 - Damper according to claim 1 or 2, characterized in that the radial fingers (46, 146) of the elastic washer form spring blades. 4 - Shock absorber according to one of claims 1 to 3, characterized in that the radial fingers (46) of the elastic washer (44) are grouped in pairs and extend, in each pair, on either side d 'An axial stud (48) projecting from an end face of the ring (36) to secure it in rotation with the web (14).
5 - Amortisseur selon 1 ' ne des revendications précédentes, caractérisé en ce que les doigts radiaux (46) de la rondelle élastique (44) sont coudés ou plies en forme de dièdre dont les sommets sont appliqués sur des surfaces radiales planes (56) d'une face d'extrémité de la bague annulaire (36) .5 - Damper according to one of the preceding claims, characterized in that the radial fingers (46) of the elastic washer (44) are bent or folded in the form of a dihedron whose apices are applied to planar radial surfaces (56) d 'an end face of the annular ring (36).
6 - Amortisseur selon l'une des revendications précédentes, caractérisé en ce que la face d'appui de la rondelle élastique (44) sur la rondelle de frottement (40) est convexe.6 - Shock absorber according to one of the preceding claims, characterized in that the bearing face of the elastic washer (44) on the friction washer (40) is convex.
7 - Amortisseur selon l'une des revendications précédentes, caractérisé en ce que la bague annulaire (36, 136) constitue un organe de frottement serré entre le voile annulaire (14, 114) et une rondelle de guidage (32, 132) sur laquelle est fixé le disque de friction (12) , et comporte un rébord périphérique axial (50, 150) d'appui sur le voile annulaire (14, 114) , ce rebord périphérique délimitant un logement cylindrique (52) dans lequel sont reçues la rondelle élastique (44, 144) et la rondelle de frottement (40, 140) précitées .7 - Shock absorber according to one of the preceding claims, characterized in that the annular ring (36, 136) constitutes a friction member clamped between the annular web (14, 114) and a guide washer (32, 132) on which is fixed the friction disc (12), and has an axial peripheral rim (50, 150) bearing on the annular web (14, 114), this peripheral rim defining a cylindrical housing (52) in which the washer is received elastic (44, 144) and the aforementioned friction washer (40, 140).
8 - Amortisseur selon 1 'une des revendications 1 à 7, caractérisé en ce que les doigts radiaux (46, 146) de la rondelle élastique s'étendent dans des découpes (54, 154) formées dans un r bord périphérique (50, 150) de la bague annulaire (36, 136) . 8 - Shock absorber according to one of claims 1 to 7, characterized in that the radial fingers (46, 146) of the elastic washer extend in cutouts (54, 154) formed in a peripheral r r (50, 150 ) of the annular ring (36, 136).
PCT/FR1999/003045 1998-12-23 1999-12-07 Torsional damper for friction clutch, in particular for motor vehicle WO2000039481A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
MXPA00008214A MXPA00008214A (en) 1998-12-23 1999-12-07 Torsional damper for friction clutch, in particular for motor vehicle.
HU0101085A HU222141B1 (en) 1998-12-23 1999-12-07 Torsional damper for friction clutch, in particular for motor vehicle
DE19982945T DE19982945B4 (en) 1998-12-23 1999-12-07 Torsionsdämpfer for a friction clutch, in particular for motor vehicles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9816420A FR2787844B1 (en) 1998-12-23 1998-12-23 TORSION SHOCK ABSORBER FOR A FRICTION CLUTCH, PARTICULARLY FOR A MOTOR VEHICLE
FR98/16420 1998-12-23

Publications (1)

Publication Number Publication Date
WO2000039481A1 true WO2000039481A1 (en) 2000-07-06

Family

ID=9534486

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1999/003045 WO2000039481A1 (en) 1998-12-23 1999-12-07 Torsional damper for friction clutch, in particular for motor vehicle

Country Status (6)

Country Link
KR (1) KR100602312B1 (en)
DE (1) DE19982945B4 (en)
FR (1) FR2787844B1 (en)
HU (1) HU222141B1 (en)
MX (1) MXPA00008214A (en)
WO (1) WO2000039481A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008522110A (en) * 2004-12-02 2008-06-26 ゼエフィ・ド・ブラジル・ソシエダデ・ポル・クオタス・デ・レスポンシビリダデ・リミターダ−ディビサン・ゼエフィ・サシュス Clutch disk and clutch device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100595004B1 (en) * 2004-11-02 2006-06-30 주식회사 서진클러치 Clutch damper disk assembly with multiple friction pad
FR2987088B1 (en) * 2012-02-16 2014-10-24 Valeo Embrayages TORSION DAMPER DEVICE HAVING TWO TORQUE OUTPUT SAILS WHICH ARE AGENCIES ON AND OFF OF TORQUE INLET WASHERS
KR102093560B1 (en) 2018-06-29 2020-03-27 주식회사평화발레오 Separable torsion damper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3616301A1 (en) * 1985-05-18 1986-11-20 LuK Lamellen und Kupplungsbau GmbH, 7580 Bühl Torsional vibration damper
DE3941693A1 (en) * 1988-12-24 1990-07-26 Luk Lamellen & Kupplungsbau Torsion vibration damper for vehicle clutches - has axially compact arrangement of energy accumulators
GB2233735A (en) * 1989-07-11 1991-01-16 Fichtel & Sachs Ag Clutch disk assembly with delayed friction device
EP0488859A1 (en) * 1990-11-28 1992-06-03 Valeo Device for dumping torsions, for a disck cluch of a automobile vehicle
WO1996014521A1 (en) * 1994-11-08 1996-05-17 Valeo Torsional damper, particularly a driven plate assembly for a motor vehicle clutch

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2674593B1 (en) * 1991-03-29 1993-05-07 Valeo TORSION SHOCK ABSORBER COMPRISING A HOUSING PRE-SHOCK ABSORBER WITH HOOK LEGS, ESPECIALLY FOR A MOTOR VEHICLE.
JP3422599B2 (en) * 1995-07-24 2003-06-30 株式会社エクセディ Damper disk assembly
FR2757919B1 (en) * 1996-12-31 2002-01-25 Valeo FRICTION WASHER, AND TORSION DAMPING DEVICE, PARTICULARLY FOR A MOTOR VEHICLE, USING AT LEAST ONE SUCH A FRICTION WASHER

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3616301A1 (en) * 1985-05-18 1986-11-20 LuK Lamellen und Kupplungsbau GmbH, 7580 Bühl Torsional vibration damper
DE3941693A1 (en) * 1988-12-24 1990-07-26 Luk Lamellen & Kupplungsbau Torsion vibration damper for vehicle clutches - has axially compact arrangement of energy accumulators
GB2233735A (en) * 1989-07-11 1991-01-16 Fichtel & Sachs Ag Clutch disk assembly with delayed friction device
EP0488859A1 (en) * 1990-11-28 1992-06-03 Valeo Device for dumping torsions, for a disck cluch of a automobile vehicle
WO1996014521A1 (en) * 1994-11-08 1996-05-17 Valeo Torsional damper, particularly a driven plate assembly for a motor vehicle clutch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008522110A (en) * 2004-12-02 2008-06-26 ゼエフィ・ド・ブラジル・ソシエダデ・ポル・クオタス・デ・レスポンシビリダデ・リミターダ−ディビサン・ゼエフィ・サシュス Clutch disk and clutch device

Also Published As

Publication number Publication date
KR100602312B1 (en) 2006-07-14
HU222141B1 (en) 2003-04-28
FR2787844A1 (en) 2000-06-30
DE19982945B4 (en) 2009-07-09
HUP0101085A3 (en) 2002-01-28
KR20010041191A (en) 2001-05-15
DE19982945T1 (en) 2001-04-12
FR2787844B1 (en) 2001-02-02
HUP0101085A2 (en) 2001-08-28
MXPA00008214A (en) 2002-04-24

Similar Documents

Publication Publication Date Title
EP2959181B1 (en) Vibration damper for clutch friction disc of a motor vehicle
EP2824361B1 (en) Dual mass flywheel with improved damping means
EP0237373A1 (en) Transmission fly wheel for a vehicle
EP2678583A1 (en) Torsional damper for a clutch
FR3097926A1 (en) Torque transmission device equipped with a torque limiter
FR2710385A1 (en) Torsional damper.
FR2657930A1 (en) TWO-DISC CLUTCH.
WO2000039481A1 (en) Torsional damper for friction clutch, in particular for motor vehicle
WO2010092244A1 (en) Dual mass flywheel with a tilt limiter
FR2633360A1 (en) TORSION DAMPER DEVICE, IN PARTICULAR FOR A MOTOR VEHICLE
EP1825160B1 (en) Friction clutch, in particular for motor vehicle, of the type comprising an improved shock absorber
WO2005124186A1 (en) Twin mass damping flywheel, particularly for a motor vehicle
EP0746700B1 (en) Torsion damping device
FR2736698A1 (en) TORSION OSCILLATION DAMPER, ESPECIALLY FOR AUTOMOTIVE VEHICLE TRANSMISSIONS
WO2000060252A1 (en) Torsion shock absorber for a clutch and set of friction washers for said torsion shock absorber
FR2804190A1 (en) Torsion damper for a friction clutch especially for automotive vehicles, has friction members associated with both principal damper and pre-damper respectively
FR2936850A1 (en) FRICTION CLUTCH WITH A SYMMETRIC DAMPER, IN PARTICULAR FOR A MOTOR VEHICLE, COMPRISING DIFFERENTIAL DAMPING MEANS.
EP0740747A1 (en) Torsional damper device with a pre-damping cassette
FR2816679A1 (en) Vehicle transmission system has torsion damper and torque limiter mounted between primary and secondary flywheels, shaft at output end of damper and limiter being mounted with radial play with respect to secondary flywheel
EP0424199B1 (en) Differential with friction damping
WO2000075528A2 (en) Torsion damper for a friction clutch, especially for an automobile
WO2000029761A1 (en) Torsional damper for friction clutch disk
EP2492539A1 (en) Torsion damper for a clutch
WO2000039482A1 (en) Torsional damper for clutch, in particular for motor vehicle
FR2794511A1 (en) Torsion damper for motor vehicle friction clutch has friction washer with seating for elastic washer

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): DE HU KR MX

WWE Wipo information: entry into national phase

Ref document number: PA/a/2000/008214

Country of ref document: MX

Ref document number: 1020007009259

Country of ref document: KR

RET De translation (de og part 6b)

Ref document number: 19982945

Country of ref document: DE

Date of ref document: 20010412

WWE Wipo information: entry into national phase

Ref document number: 19982945

Country of ref document: DE

WWP Wipo information: published in national office

Ref document number: 1020007009259

Country of ref document: KR

WWG Wipo information: grant in national office

Ref document number: 1020007009259

Country of ref document: KR

REG Reference to national code

Ref country code: DE

Ref legal event code: 8607

REG Reference to national code

Ref country code: DE

Ref legal event code: 8607