WO2015049433A1 - Clutch disc device - Google Patents

Clutch disc device Download PDF

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Publication number
WO2015049433A1
WO2015049433A1 PCT/FR2014/052314 FR2014052314W WO2015049433A1 WO 2015049433 A1 WO2015049433 A1 WO 2015049433A1 FR 2014052314 W FR2014052314 W FR 2014052314W WO 2015049433 A1 WO2015049433 A1 WO 2015049433A1
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WO
WIPO (PCT)
Prior art keywords
friction
washers
intermediate portion
disc
damping
Prior art date
Application number
PCT/FR2014/052314
Other languages
French (fr)
Inventor
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
Priority to DE112014004532.2T priority Critical patent/DE112014004532T5/en
Publication of WO2015049433A1 publication Critical patent/WO2015049433A1/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
    • F16D13/60—Clutching elements
    • F16D13/64—Clutch-plates; Clutch-lamellae
    • 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
    • F16D13/60—Clutching elements
    • F16D13/64—Clutch-plates; Clutch-lamellae
    • F16D13/68—Attachments of plates or lamellae to their supports
    • 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
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
    • F16D3/14—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions combined with a friction coupling for damping vibration or absorbing shock

Definitions

  • the invention relates to the reduction of noise encountered at the time of activation of a friction clutch.
  • a clutch disc device comprising: a rigid support rotating about an axis of rotation; a friction disk having a radially inner fixing portion to the rigid support, a radially outer portion to which friction linings are attached, and a flexible intermediate portion connecting the inner portion to the outer portion, having two axially facing faces to the opposite each other, and axially on either side of the friction disk, two resilient damping washers, each associated with one of the two faces of the intermediate portion of the friction disc and having a portion radially inner fixing to the rigid support, a radially outer bearing portion bearing axially against the associated face of the flexible intermediate portion of the friction disk, and a pre-stressed flexible intermediate portion providing a minimum contact pressure between the part of support of the damping washer and the associated face.
  • the dynamic deformations of the intermediate portion of the friction disc, and in particular the vibratory deformations of the disc out of its plane, parallel to the axis of rotation, generate relative radial movements of small amplitude to the contact between the elastic washers. damping and friction disc, the structure of the interface allowing at this level a dissipation of energy by friction.
  • the presence of resilient washers bearing on the two opposite faces of the friction disk ensures that at least one of the two spring washers will always be in contact even in the case of axial deformation of high amplitude.
  • the deformations of the friction disc out of its plane are also minimized by the presence of the two washers.
  • each of the two damping washers exerts on the associated face forces having an axial resultant, the resultant forces on both sides being in opposite directions.
  • the modules of these two resultants are equal to, or differ by less than 10% from each other.
  • Both sides of the middle part of the disc friction have contact areas with the two washers which are preferably located at an identical distance from the axis of rotation. This avoids any static deformation of the friction disc.
  • each resultant has a modulus preferably greater than 100 N and preferably greater than 120N and preferably greater than 150 N, but preferably less than 250N, and preferably less than 200N.
  • the bearing portion of the damping washers and the two faces of the intermediate portion of the friction disk have roughnesses such that there is a static coefficient of friction greater than 0.3, and preferably greater than 0.4 between the bearing portion of each of the washers and the associated face.
  • At least one of the elastic washers is provided with a contact coating with the associated face of the intermediate portion of the friction disc.
  • This contact coating may include rubber. The goal here is to optimize contact friction to maximize energy dissipation.
  • the intermediate portion of the damping discs is arched.
  • the faces of the intermediate portion of the friction disc are preferably flat and perpendicular to the axis of rotation.
  • the two damping washers are preferably made of steel.
  • the rigid support constitutes a first member of a vibration damper comprising a second member, rotating relative to the first member about the axis of rotation, the first and the second members being connected to each other. to one another by springs working according to the angular deflections between the first member and the second member about the axis of rotation.
  • At least one of the elastic damping washers is dimensioned so that it exists between a distance A measured axially. between the fastening portion of said washer and the bearing portion of said washer, and a distance B measured radially between the fixing portion of said washer and the bearing portion of said washer, an A / B ratio of between 2 / 3 and 3/2, and preferably between 0.9 and 1.1.
  • FIG. 1 a clutch disk device according to a first embodiment of FIG. the invention
  • - Figure 2 a detail of Figure 1
  • Figure 3 a clutch disc device according to a second embodiment of the invention.
  • FIG. 1 illustrates a clutch disc device 10 comprising a friction disk 12 fixed by spacers 13 to a rigid support rotating about an axis of rotation 100, this rigid support consisting of in this embodiment, by a guide ring 14 of a torsional vibration damper 16 which further comprises a damping web 18 and preferably a second guide ring 20, fixed to the first by the spacers 13, the two guide washers 14, 20 thus axially framing the damper web 18.
  • springs 24 are arranged in windows provided for this purpose in the damper web 18 and the guide washers 14, 20, so as to allow limited angular movement between the two guide washers 14, 20 and the damper web 18 around the axis of rotation 100, while providing a springback to a median angular position "rest ".
  • Friction washers 26 are further provided between the guide washers 14, 20 and the damper web 18 to dissipate energy during angular deflections.
  • the damper veil 18 is secured by a splined connection 28 to a hub 30 into which is slid, also by a splined connection, a gearbox input shaft (not shown).
  • the friction disc 12 has a radially inner fixing portion 32 secured to the guide washers 14, 20 this fixing portion being provided with through holes for the spacers 13.
  • the friction disk 12 further has a radially outer portion 34 to which friction linings 36 are attached, and a flexible intermediate portion 38 connecting the inner portion 32 to the outer portion 34 and having two planar faces 40 facing. axially opposite each other.
  • each of the damping washers 42 has a radially inner portion 44 for attachment to the guide washers 14, 20 via the spacers 13, a radially outer bearing portion 46 bearing axially against the associated face 40 of the flexible intermediate portion 38 of the friction disk 12, and a pre-stressed flexible intermediate portion 48 of arched profile ensuring a minimum contact pressure between the bearing portion 46 of the damping washer and the associated face 40
  • the two faces 40 of the intermediate portion 32 of the friction disk have zones of contact with the two washers 42 which are located at an identical distance from the axle.
  • each of the spring washers 42 is provided with a contact coating 50, for example rubber, with the associated face 40 of the intermediate portion of the friction disc.
  • each of the two damping washers 42 exerts on the associated face 40 forces having an axial resultant, the resultants of the forces on the two faces being in opposite directions and different from less than 10% of each other.
  • Each resultant has a module of the order for example of 150 N.
  • the two damping rings 42 are not symmetrical to each other with respect to a median plane of the friction disk 12.
  • the damping capacity the right washer in the figure is larger than that of the left washer.
  • FIG. 3 has been illustrated a clutch disc device 10 according to a second embodiment of the invention, which differs essentially from the previous in that the friction disc 12 and the damping discs 42 are secured by means of spacers 13 to a damper web 18 flanked by two guide washers which are fixed to a hub 30 to be fitted on the input shaft of a gearbox. Furthermore, in this embodiment, the damping discs 42 are devoid of a contact coating, so that the metallic steel damping discs 42 are in direct contact with the associated faces 40 of the friction disc 12. also in FIG. 3, fixing struts 52 of the two guide washers 14, 20 to one another.
  • the friction disc 12 has a relatively high flexibility, to allow decoupling between the pressure plate and the downstream members, and in particular the torsional vibration damper 16.
  • the friction disc 12 is biased bending out of his plan.
  • the dynamic deformations are accompanied by a friction between the damping washers 42 and the associated faces 40 of the friction disc 12.
  • the amplitude of the radial displacement between the damping washers 40 and friction disc 12 may be of the order of 0.5mm.

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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 clutch disc device (10) comprising a rigid mounting (14, 18) rotating about an axis of rotation (100) and a friction disc (12) having a radially inner portion (32) for attachment to the rigid mounting (14, 18), a radially outer portion (34) to which friction linings (36) are attached, and a flexible intermediate portion (38) connecting the inner portion (32) to the outer portion (34) and having two surfaces (40) which face one another axially. Two resilient damping washers (42) are arranged axially on either side of the friction disc (12) and each associated with one of the two surfaces (40) of the intermediate portion of the friction disc. Said washers (42) have a radially inner portion (44) for attachment to the rigid mounting (14, 18), a radially outer bearing portion (46) engaging axially with the associated surface (40) of the flexible intermediate portion of the friction disc, and a pre-stressed flexible intermediate portion (48) providing contact pressure between the bearing portion (46) of the damping washer and the associated surface (40).

Description

DISPOSITIF DE DISQUE D'EMBRAYAGE  CLUTCH DISC DEVICE
DOMAINE TECHNIQUE DE L'INVENTION TECHNICAL FIELD OF THE INVENTION
[0001] L'invention se rapporte à la réduction des bruits rencontrés au moment de l'activation d'un embrayage à friction. ETAT DE LA TECHNIQUE ANTERIEURE  The invention relates to the reduction of noise encountered at the time of activation of a friction clutch. STATE OF THE PRIOR ART
[0002] Les bruits rencontrés dans les phases transitoires d'embrayage et de débrayage d'un embrayage à friction, lorsque l'embrayage est partiellement engagé, par exemple au démarrage, résultent de la combinaison de divers facteurs dans l'embrayage, et en amont et en aval de celui-ci. En laissant de côté les modes de torsion qui ne nous intéresseront pas dans le cadre du présent exposé, les vibrations générées entre les garnitures de friction et le plateau de pression excitent le plateau de pression sur ses modes propres axiaux de pompage. Le disque de friction portant les garnitures transmet tout ou partie de ces vibrations à l'arbre d'entrée de la boîte de transmission, qui est notamment excité sur ses modes de résonance en flexion.  The noises encountered in the transient clutch and disengagement phases of a friction clutch, when the clutch is partially engaged, for example at startup, result from the combination of various factors in the clutch, and upstream and downstream of it. Leaving aside the modes of torsion that will not interest us in the context of this presentation, the vibrations generated between the friction linings and the pressure plate excite the pressure plate on its own axial modes of pumping. The friction disc carrying the linings transmits all or part of these vibrations to the input shaft of the gearbox, which is notably excited on its flexural resonance modes.
[0003] Il a été recommandé dans le document EP 0 272 328 de prendre des dispositions pour amortir les vibrations axiales d'un disque de friction, fixé intérieurement à une rondelle de guidage d'un amortisseur de torsion et pourvu à sa périphérie extérieure de garnitures de friction. Parmi les diverses mesures correctives proposées, il est envisagé de positionner un élément de friction pourvu ou non d'un revêtement caoutchouc, en appui axial contre une partie médiane intermédiaire du disque de friction, avec une pression d'environ lkg/cm2. Mais ce dispositif s'avère peu efficace et, du fait des efforts axiaux appliqués au disque de friction, risque d'engendrer une déformation de celui-ci qui peut altérer le débrayage ou créer du faux parallélisme géométrique impliquant une plus grande sensibilité au broutement. It has been recommended in document EP 0 272 328 to make provision for damping the axial vibrations of a friction disc, internally fixed to a guide ring of a torsion damper and provided at its outer periphery with friction linings. Among the various corrective measures proposed, it is envisaged to position a friction element provided or not with a rubber coating, in axial support against an intermediate median portion of the friction disc, with a pressure of about 1 kg / cm 2. However, this device proves to be inefficient and, because of the axial forces applied to the friction disk, risks creating a deformation thereof that can alter the clutch or create false geometric parallelism involving a greater susceptibility to chatter.
EXPOSE DE L'INVENTION SUMMARY OF THE INVENTION
[0004] L'invention vise à remédier aux inconvénients de l'état de la technique et à proposer un mécanisme limitant davantage les émissions de bruits parasites, sans altérer les actions de débrayage ou d'embrayage. Pour ce faire est proposé un dispositif de disque d'embrayage comportant : un support rigide tournant autour d'un axe de rotation; un disque de friction présentant une partie radialement intérieure de fixation au support rigide, une partie radialement extérieure à laquelle sont fixées des garnitures de friction, et une partie intermédiaire flexible reliant la partie intérieure à la partie extérieure, présentant deux faces tournées axialement à l'opposé l'une de l'autre, et axialement de part et d'autre du disque de friction, deux rondelles élastiques d'amortissement, associées chacune à l'une des deux faces de la partie intermédiaire du disque de friction et présentant une partie radialement intérieure de fixation au support rigide, une partie radialement extérieure d'appui venant en appui axial contre la face associée de la partie intermédiaire flexible du disque de friction, et une partie intermédiaire flexible précontrainte assurant une pression de contact minimale entre la partie d'appui de la rondelle d'amortissement et la face associée. The invention aims to overcome the disadvantages of the state of the art and to propose a mechanism further limiting emissions of unwanted noise, without altering the disengagement actions or clutch. To do this is proposed a clutch disc device comprising: a rigid support rotating about an axis of rotation; a friction disk having a radially inner fixing portion to the rigid support, a radially outer portion to which friction linings are attached, and a flexible intermediate portion connecting the inner portion to the outer portion, having two axially facing faces to the opposite each other, and axially on either side of the friction disk, two resilient damping washers, each associated with one of the two faces of the intermediate portion of the friction disc and having a portion radially inner fixing to the rigid support, a radially outer bearing portion bearing axially against the associated face of the flexible intermediate portion of the friction disk, and a pre-stressed flexible intermediate portion providing a minimum contact pressure between the part of support of the damping washer and the associated face.
[0005] Les déformations dynamiques de la partie intermédiaire du disque de friction, et notamment les déformations vibratoires du disque hors de son plan, parallèlement à l'axe de rotation, engendrent des mouvements radiaux relatifs de faible amplitude au contact entre rondelles élastiques d'amortissement et disque de friction, la structure de l'interface permettant à ce niveau une dissipation d'énergie par friction. La présence de rondelles élastiques en appui sur les deux faces opposées du disque de friction permet d'assurer qu'au moins une des deux rondelles élastiques sera toujours au contact même en cas de déformation axiale de forte amplitude. Les déformations du disque de friction hors de son plan sont d'ailleurs minimisées par la présence des deux rondelles. The dynamic deformations of the intermediate portion of the friction disc, and in particular the vibratory deformations of the disc out of its plane, parallel to the axis of rotation, generate relative radial movements of small amplitude to the contact between the elastic washers. damping and friction disc, the structure of the interface allowing at this level a dissipation of energy by friction. The presence of resilient washers bearing on the two opposite faces of the friction disk ensures that at least one of the two spring washers will always be in contact even in the case of axial deformation of high amplitude. The deformations of the friction disc out of its plane are also minimized by the presence of the two washers.
[0006] Dans une position médiane de repos non déformée du disque de friction, chacune des deux rondelles d'amortissement exerce sur la face associée des efforts ayant une résultante axiale, les résultantes des efforts sur les deux faces étant de sens opposés. De préférence, les modules de ces deux résultantes sont égaux, ou diffèrent de moins de 10% l'un de l'autre. Les deux faces de la partie intermédiaire du disque de friction présentent des zones de contact avec les deux rondelles qui sont de préférence située à une distance identique de l'axe de rotation. On évite ainsi toute déformation statique du disque de friction. In a median position of undisturbed rest of the friction disc, each of the two damping washers exerts on the associated face forces having an axial resultant, the resultant forces on both sides being in opposite directions. Preferably, the modules of these two resultants are equal to, or differ by less than 10% from each other. Both sides of the middle part of the disc friction have contact areas with the two washers which are preferably located at an identical distance from the axis of rotation. This avoids any static deformation of the friction disc.
[0007] De préférence, chaque résultante a un module de préférence supérieur à 100 N et de préférence supérieur à 120N et de préférence supérieur à 150 N, mais de préférence inférieur à 250N, et de préférence inférieur à 200N. Preferably, each resultant has a modulus preferably greater than 100 N and preferably greater than 120N and preferably greater than 150 N, but preferably less than 250N, and preferably less than 200N.
[0008] Suivant un mode de réalisation, la partie d'appui des rondelles d'amortissement et les deux faces de la partie intermédiaire du disque de friction ont des rugosités telles qu'il existe un coefficient de frottement statique supérieur à 0,3, et de préférence supérieur à 0,4 entre la partie d'appui de chacune des rondelles et la face associée. According to one embodiment, the bearing portion of the damping washers and the two faces of the intermediate portion of the friction disk have roughnesses such that there is a static coefficient of friction greater than 0.3, and preferably greater than 0.4 between the bearing portion of each of the washers and the associated face.
[0009] Suivant un mode de réalisation, au moins une des rondelles élastiques est pourvue d'un revêtement de contact avec la face associée de la partie intermédiaire du disque de friction. Ce revêtement de contact peut notamment comporter du caoutchouc. L'objectif est ici d'optimiser le frottement de contact pour maximiser la dissipation d'énergie. According to one embodiment, at least one of the elastic washers is provided with a contact coating with the associated face of the intermediate portion of the friction disc. This contact coating may include rubber. The goal here is to optimize contact friction to maximize energy dissipation.
[0010] Suivant un mode de réalisation, la partie intermédiaire des rondelles d'amortissement est cambrée. Les faces de la partie intermédiaire du disque de friction sont de préférence planes et perpendiculaires à l'axe de rotation. [0011] Les deux rondelles d'amortissement sont de préférence en acier. According to one embodiment, the intermediate portion of the damping discs is arched. The faces of the intermediate portion of the friction disc are preferably flat and perpendicular to the axis of rotation. The two damping washers are preferably made of steel.
[0012] Suivant un mode de réalisation, le support rigide constitue un premier organe d'un amortisseur de vibration comportant un deuxième organe, tournant par rapport au premier organe autour de l'axe de rotation, le premier et le deuxième organes étant reliés l'un à l'autre par des ressorts travaillant en fonction des débattements angulaires entre le premier organe et le deuxième organe autour de l'axe de rotation. According to one embodiment, the rigid support constitutes a first member of a vibration damper comprising a second member, rotating relative to the first member about the axis of rotation, the first and the second members being connected to each other. to one another by springs working according to the angular deflections between the first member and the second member about the axis of rotation.
[0013] De préférence, l'une au moins des rondelles élastiques d'amortissement est dimensionnée de manière qu'il existe entre une distance A mesurée axialement entre la partie de fixation de ladite rondelle et la partie d'appui de ladite rondelle, et une distance B mesurée radialement entre la partie de fixation de ladite rondelle et la partie d'appui de ladite rondelle, un rapport A/B compris entre 2/3 et 3/2, et de préférence entre 0,9 et 1,1. BREVE DESCRIPTION DES FIGURES Preferably, at least one of the elastic damping washers is dimensioned so that it exists between a distance A measured axially. between the fastening portion of said washer and the bearing portion of said washer, and a distance B measured radially between the fixing portion of said washer and the bearing portion of said washer, an A / B ratio of between 2 / 3 and 3/2, and preferably between 0.9 and 1.1. BRIEF DESCRIPTION OF THE FIGURES
[0014] D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit, en référence aux figures annexées, qui illustrent : la figure 1, un dispositif de disque d'embrayage selon un premier mode de réalisation de l'invention; - la figure 2, un détail de la figure 1, la figure 3, un dispositif de disque d'embrayage selon un deuxième mode de réalisation de l'invention.  Other features and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures, which illustrate: FIG. 1, a clutch disk device according to a first embodiment of FIG. the invention; - Figure 2, a detail of Figure 1, Figure 3, a clutch disc device according to a second embodiment of the invention.
[0015] Pour plus de clarté, les éléments identiques sont repérés par des signes de référence identiques sur l'ensemble des figures. DESCRIPTION DÉTAILLÉE DE MODES DE REALISATION For clarity, the identical elements are identified by identical reference signs throughout the figures. DETAILED DESCRIPTION OF EMBODIMENTS
[0016] Sur la figure 1 a été illustré un dispositif de disque d'embrayage 10, comportant un disque de friction 12 fixé par des entretoises 13 à un support rigide tournant autour d'un axe de rotation 100, ce support rigide étant constitué, dans ce mode de réalisation, par une rondelle de guidage 14 d'un amortisseur de vibrations de torsion 16 qui comporte en outre un voile d'amortisseur 18 et de préférence une deuxième rondelle de guidage 20, fixée à la première par les entretoises 13, les deux rondelles de guidage 14, 20 encadrant ainsi axialement le voile d'amortisseur 18. De manière connue, des ressorts 24 sont disposés dans des fenêtres prévues à cet effet dans le voile d'amortisseur 18 et les rondelles de guidage 14, 20, de façon à permettre un débattement angulaire limité entre les deux rondelles de guidage 14, 20 et le voile d'amortisseur 18 autour de l'axe de rotation 100, tout en assurant un retour élastique vers une position angulaire médiane "de repos". Des rondelles de friction 26 sont en outre prévues entre les rondelles de guidage 14, 20 et le voile d'amortisseur 18, pour dissiper de l'énergie lors des débattements angulaires. Le voile d'amortisseur 18 est solidarisé par une liaison cannelée 28 à un moyeu 30 dans lequel vient s'emmancher, également par une liaison cannelée, un arbre d'entrée de boîte de transmission (non représenté). FIG. 1 illustrates a clutch disc device 10 comprising a friction disk 12 fixed by spacers 13 to a rigid support rotating about an axis of rotation 100, this rigid support consisting of in this embodiment, by a guide ring 14 of a torsional vibration damper 16 which further comprises a damping web 18 and preferably a second guide ring 20, fixed to the first by the spacers 13, the two guide washers 14, 20 thus axially framing the damper web 18. In known manner, springs 24 are arranged in windows provided for this purpose in the damper web 18 and the guide washers 14, 20, so as to allow limited angular movement between the two guide washers 14, 20 and the damper web 18 around the axis of rotation 100, while providing a springback to a median angular position "rest ". Friction washers 26 are further provided between the guide washers 14, 20 and the damper web 18 to dissipate energy during angular deflections. The damper veil 18 is secured by a splined connection 28 to a hub 30 into which is slid, also by a splined connection, a gearbox input shaft (not shown).
[0017] Le disque de friction 12 présente une partie radialement intérieure 32 de fixation solidarisée aux rondelles de guidage 14, 20 cette partie de fixation étant pourvue de trous de passage pour les entretoises 13. The friction disc 12 has a radially inner fixing portion 32 secured to the guide washers 14, 20 this fixing portion being provided with through holes for the spacers 13.
[0018] Le disque de friction 12 présente en outre une partie radialement extérieure 34 à laquelle sont fixées des garnitures de friction 36, et une partie intermédiaire flexible 38 reliant la partie intérieure 32 à la partie extérieure 34 et qui présente deux faces planes 40 tournées axialement à l'opposé l'une de l'autre. The friction disk 12 further has a radially outer portion 34 to which friction linings 36 are attached, and a flexible intermediate portion 38 connecting the inner portion 32 to the outer portion 34 and having two planar faces 40 facing. axially opposite each other.
[0019] Comme illustré en détail sur la figure 2, deux rondelles élastiques d'amortissement 42 en acier sont disposées axialement de part et d'autre du disque de friction 12 et associées chacune à l'une des deux faces 40 de la partie intermédiaire 38 du disque de friction 12. Chacune des rondelles d'amortissement 42 présente une partie radialement intérieure 44 de fixation aux rondelles de guidage 14, 20 par l'intermédiaire des entretoises 13, une partie radialement extérieure 46 d'appui venant en appui axial contre la face associée 40 de la partie intermédiaire flexible 38 du disque de friction 12, et une partie intermédiaire 48 flexible précontrainte de profil cambré assurant une pression de contact minimale entre la partie d'appui 46 de la rondelle d'amortissement et la face associée 40. Les deux faces 40 de la partie intermédiaire 32 du disque de friction présentent des zones de contact avec les deux rondelles 42 qui sont situées à une distance identique de l'axe de rotation 100. Dans ce mode de réalisation, chacune des rondelles élastiques 42 est pourvue d'un revêtement de contact 50, par exemple en caoutchouc, avec la face associée 40 de la partie intermédiaire du disque de friction. As illustrated in detail in FIG. 2, two elastic damping washers 42 made of steel are arranged axially on either side of the friction disc 12 and each associated with one of the two faces 40 of the intermediate portion. 38 of the friction disk 12. Each of the damping washers 42 has a radially inner portion 44 for attachment to the guide washers 14, 20 via the spacers 13, a radially outer bearing portion 46 bearing axially against the associated face 40 of the flexible intermediate portion 38 of the friction disk 12, and a pre-stressed flexible intermediate portion 48 of arched profile ensuring a minimum contact pressure between the bearing portion 46 of the damping washer and the associated face 40 The two faces 40 of the intermediate portion 32 of the friction disk have zones of contact with the two washers 42 which are located at an identical distance from the axle. In this embodiment, each of the spring washers 42 is provided with a contact coating 50, for example rubber, with the associated face 40 of the intermediate portion of the friction disc.
[0020] Dans la position médiane "de repos" non déformée du disque de friction illustrée sur la figure 1, chacune des deux rondelles d'amortissement 42 exerce sur la face associée 40 des efforts ayant une résultante axiale, les résultantes des efforts sur les deux faces étant de sens opposés et différents de moins de 10% l'un de l'autre. Chaque résultante a un module de l'ordre par exemple de 150 N. [0021] Pour des raisons d'encombrement, les deux rondelles d'amortissement 42 ne sont pas symétriques l'une de l'autre par rapport à un plan médian du disque de friction 12. L'expérience montre que la capacité d'amortissement de la rondelle de droite sur la figure est plus importante que celle de la rondelle de gauche. Si on définit d'une part une distance A entre le plan de contact et le point d'ancrage de la rondelle 42 mesurée perpendiculairement au plan de contact (donc parallèlement à l'axe de rotation), et d'autre part une distance B entre le point d'ancrage et la zone de contact, mesurée cette fois radialement, parallèlement au plan de contact, la composante radiale du mouvement relatif de la rondelle 42 par rapport au disque de friction 12 en cas de déplacement axial de ce dernier croît avec le rapport A/B. Un compromis favorable entre performance et encombrement est obtenu pour 2/3 < A/B < 3/2. In the undeformed median "rest" position of the friction disk illustrated in FIG. 1, each of the two damping washers 42 exerts on the associated face 40 forces having an axial resultant, the resultants of the forces on the two faces being in opposite directions and different from less than 10% of each other. Each resultant has a module of the order for example of 150 N. For reasons of space, the two damping rings 42 are not symmetrical to each other with respect to a median plane of the friction disk 12. Experience shows that the damping capacity the right washer in the figure is larger than that of the left washer. If one defines on the one hand a distance A between the contact plane and the anchoring point of the washer 42 measured perpendicularly to the plane of contact (thus parallel to the axis of rotation), and on the other hand a distance B between the anchor point and the contact zone, measured this time radially, parallel to the contact plane, the radial component of the relative movement of the washer 42 with respect to the friction disk 12 in the case of axial displacement of the latter increases with the A / B ratio. A favorable compromise between performance and bulk is obtained for 2/3 <A / B <3/2.
[0022] Sur la figure 3 a été illustré un dispositif de disque d'embrayage 10 suivant un deuxième mode de réalisation de l'invention, qui diffère essentiellement du précédent par le fait que le disque de friction 12 et les rondelles d'amortissement 42 sont solidarisés par l'intermédiaire d'entretoises 13 à un voile d'amortisseur 18 encadré par deux rondelles de guidage qui sont fixée à un moyeu 30 destiné à être emmanché sur l'arbre d'entrée d'une boîte de transmission. Par ailleurs, les rondelles d'amortissement 42 sont dans ce mode de réalisation dépourvues de revêtement de contact, de sorte que les rondelles d'amortissement métallique en acier 42 sont directement en contact avec les faces associées 40 du disque de friction 12. On visualise également sur la figure 3 des entretoises de fixation 52 des deux rondelles de guidage 14, 20 l'une à l'autre. In Figure 3 has been illustrated a clutch disc device 10 according to a second embodiment of the invention, which differs essentially from the previous in that the friction disc 12 and the damping discs 42 are secured by means of spacers 13 to a damper web 18 flanked by two guide washers which are fixed to a hub 30 to be fitted on the input shaft of a gearbox. Furthermore, in this embodiment, the damping discs 42 are devoid of a contact coating, so that the metallic steel damping discs 42 are in direct contact with the associated faces 40 of the friction disc 12. also in FIG. 3, fixing struts 52 of the two guide washers 14, 20 to one another.
[0023] Lors des phases transitoires durant lesquelles les garnitures de friction 36 sont partiellement engagées avec un plateau de pression en patinant, par exemple lors des phases de démarrage, les garnitures 36 sont excitées notamment en direction axiale. Le disque de friction 12 présente une flexibilité relativement importante, pour permettre un découplage entre le plateau de pression et les organes situés en aval, et notamment l'amortisseur de vibration de torsion 16. Le disque de friction 12 est donc sollicité en flexion hors de son plan. Les déformations dynamiques s'accompagnent d'un frottement entre les rondelles d'amortissement 42 et les faces associées 40 du disque de friction 12. [0024] Pour fixer les idées, à titre purement indicatif, l'amplitude du déplacement radial entre rondelles d'amortissement 40 et disque de friction 12 peut être de l'ordre de 0,5mm. À une fréquence d'excitation de 300Hz (typique pour l'émission d'un bruit grincement) avec un effort de 150N de chaque rondelle d'amortissement et un coefficient de frottement de 0.5 à l'interface, on obtient une énergie de l'ordre de 20 Joules par rondelle, cette dissipation d'énergie permettant d'amortir efficacement les oscillations axiales du disque. During transient phases during which the friction linings 36 are partially engaged with a pressure plate skidding, for example during startup phases, the liners 36 are excited particularly in the axial direction. The friction disc 12 has a relatively high flexibility, to allow decoupling between the pressure plate and the downstream members, and in particular the torsional vibration damper 16. The friction disc 12 is biased bending out of his plan. The dynamic deformations are accompanied by a friction between the damping washers 42 and the associated faces 40 of the friction disc 12. To fix ideas, purely indicative, the amplitude of the radial displacement between the damping washers 40 and friction disc 12 may be of the order of 0.5mm. At an excitation frequency of 300Hz (typical for squeak noise emission) with a 150N force of each damping washer and a coefficient of friction of 0.5 at the interface, an energy of order of 20 Joules per washer, this dissipation of energy to effectively damp the axial oscillations of the disc.

Claims

REVENDICATIONS
Dispositif de disque d'embrayage (10) comportant Clutch disk device (10) comprising
un support rigide (14, 18) tournant autour d'un axe de rotation (100); un disque de friction (12) présentant une partie radialement intérieure (32) de fixation au support rigide (14, 18), une partie radialement extérieure (34) à laquelle sont fixées des garnitures de friction (36), et une partie intermédiaire flexible (38) reliant la partie intérieure (32) à la partie extérieure (34) et présentant deux faces (40) tournées axialement à l'opposé l'une de l'autre,  a rigid support (14, 18) rotating about an axis of rotation (100); a friction disc (12) having a radially inner fixing portion (32) to the rigid support (14, 18), a radially outer portion (34) to which friction linings (36) are attached, and a flexible intermediate portion (38) connecting the inner portion (32) to the outer portion (34) and having two faces (40) facing axially opposite one another,
caractérisé en ce qu'il comporte en outre, axialement de part et d'autre du disque de friction (12), deux rondelles élastiques d'amortissement (42), associées chacune à l'une des deux faces (40) de la partie intermédiaire du disque de friction et présentant une partie radialement intérieure (44) de fixation au support rigide (14, 18), une partie radialement extérieure (46) d'appui venant en appui axial contre la face associée (40) de la partie intermédiaire flexible du disque de friction, et une partie intermédiaire flexible précontrainte (48) assurant une pression de contact entre la partie d'appui (46) de la rondelle d'amortissement et la face associée (40). characterized in that it further comprises, axially on either side of the friction disc (12), two elastic damping washers (42), each associated with one of the two faces (40) of the part intermediate friction disk and having a radially inner portion (44) for attachment to the rigid support (14, 18), a radially outer bearing portion (46) bearing axially against the associated face (40) of the intermediate portion flexible friction disc, and a pre-stressed flexible intermediate portion (48) providing a contact pressure between the bearing portion (46) of the damping washer and the associated face (40).
Dispositif de disque d'embrayage selon la revendication 1, caractérisé en ce que dans une position médiane de repos non déformée du disque de friction (12), chacune des deux rondelles d'amortissement (42) exerce sur la face associée des efforts ayant une résultante axiale, les résultantes des efforts sur les deux faces (40) étant de sens opposés et de modules égaux, ou différents de moins de 10% l'un de l'autre. Clutch disc device according to claim 1, characterized in that in a median position of undistorted rest of the friction disc (12), each of the two damping washers (42) exerts on the associated face forces having a resultant axial, the results of the efforts on the two faces (40) being in opposite directions and equal modules, or different from less than 10% of each other.
Dispositif de disque d'embrayage selon l'une quelconque des revendications précédentes, caractérisé en ce que les deux faces (40) de la partie intermédiaire (38) du disque de friction présentent des zones de contact avec les deux rondelles qui sont situées à une distance identique de l'axe de rotation. Clutch disk device according to any one of the preceding claims, characterized in that the two faces (40) of the intermediate portion (38) of the friction disk have zones of contact with the two washers which are situated at a distance from one another. identical distance from the axis of rotation.
4. Dispositif de disque d'embrayage selon la revendication précédente, caractérisé en ce que chaque résultante a un module supérieur à 100 N et de préférence supérieur à 120N et de préférence supérieur à 150 N. 4. A clutch disk device according to the preceding claim, characterized in that each resultant has a modulus greater than 100 N and preferably greater than 120N and preferably greater than 150 N.
5. Dispositif de disque d'embrayage selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie d'appui (44) des rondelles d'amortissement et les deux faces (40) de la partie intermédiaire du disque de friction ont des rugosités telles qu'il existe un coefficient de frottement supérieur à 0,3, et de préférence supérieur à 0,4 entre la partie d'appui de chacune des rondelles et la face associée. Clutch disk device according to one of the preceding claims, characterized in that the bearing portion (44) of the damping rings and the two faces (40) of the intermediate portion of the friction disc have roughness such that there is a coefficient of friction greater than 0.3, and preferably greater than 0.4 between the bearing portion of each of the washers and the associated face.
6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que au moins une des rondelles élastiques (42) est pourvue d'un revêtement (50) de contact avec la face associée (40) de la partie intermédiaire du disque de friction. 6. Device according to any one of the preceding claims, characterized in that at least one of the elastic washers (42) is provided with a coating (50) for contact with the associated face (40) of the intermediate portion of the disc of friction.
7. Dispositif selon la revendication précédente, caractérisé en ce que le revêtement (50) comporte du caoutchouc. 7. Device according to the preceding claim, characterized in that the coating (50) comprises rubber.
8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie intermédiaire (48) des rondelles d'amortissement (42) est cambrée. 8. Device according to any one of the preceding claims, characterized in that the intermediate portion (48) of the damping discs (42) is arched.
9. Dispositif de disque d'embrayage selon l'une quelconque des revendications précédentes, caractérisé en ce que les faces (40) de la partie intermédiaire du disque de friction sont planes et perpendiculaire à l'axe de rotation. 9. clutch disc device according to any one of the preceding claims, characterized in that the faces (40) of the intermediate portion of the friction disc are flat and perpendicular to the axis of rotation.
10. Dispositif de disque d'embrayage selon l'une quelconque des revendications précédentes, caractérisé en ce que les deux rondelles d'amortissement (42) sont en acier. 10. Clutch disc device according to any one of the preceding claims, characterized in that the two damping discs (42) are made of steel.
1 1 . Dispositif de disque d'embrayage selon l'une quelconque des revendications précédentes, caractérisé en ce que le support rigide (14, 18) constitue un premier organe d'un amortisseur de vibration de torsion (16) comportant un deuxième organe (18, 14), tournant par rapport au premier organe (14, 18) autour de l'axe de rotation (100), le premier et le deuxième organes étant reliés l'un à l'autre par des ressorts (24) travaillant en fonction des débattements angulaires entre le premier organe et le deuxième organe autour de l'axe de rotation. 1 1. Clutch disc device according to one of the preceding claims, characterized in that the rigid support (14, 18) constitutes a first member of a torsional vibration damper (16) comprising a second member (18, 14 ), rotating relative to the first member (14, 18) about the axis of rotation (100), the first and the second members being connected to each other by springs (24) operating in function of the movements angularly between the first member and the second member about the axis of rotation.
12. Dispositif de disque d'embrayage selon l'une quelconque des revendications précédentes, caractérisé en ce que l'une au moins des rondelles élastiques d'amortissement (42) est dimensionnée de manière qu'il existe entre une distance A mesurée axialement entre la partie de fixation (44) de ladite rondelle et la partie d'appui (46) de ladite rondelle, et une distance B mesurée radialement entre la partie de fixation (44) de ladite rondelle et la partie d'appui (46) de ladite rondelle, un rapport A/B compris entre 2/3 et 3/2. 12. Clutch disc device according to any one of the preceding claims, characterized in that at least one of the elastic damping washers (42) is dimensioned so that there exists between a distance A measured axially between the fixing portion (44) of said washer and the bearing portion (46) of said washer, and a distance B measured radially between the fixing portion (44) of said washer and the bearing portion (46) of said washer, an A / B ratio of between 2/3 and 3/2.
PCT/FR2014/052314 2013-10-01 2014-09-17 Clutch disc device WO2015049433A1 (en)

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FR1359469A FR3011298B1 (en) 2013-10-01 2013-10-01 CLUTCH DISC DEVICE
FR1359469 2013-10-01

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Publication number Priority date Publication date Assignee Title
DE102020105144B4 (en) * 2020-02-27 2022-01-27 Schaeffler Technologies AG & Co. KG Torsional vibration damper with friction device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272328A1 (en) 1986-05-26 1988-06-29 Kabushiki Kaisha Daikin Seisakusho Structure for suppressing vibration of clutch disc
FR2769057A1 (en) * 1997-09-30 1999-04-02 Exedy Corp Frictional disc clutch
FR2812698A1 (en) * 2000-08-07 2002-02-08 Mannesmann Sachs Ag Clutch disk comprises hub with frictional components arranged around its periphery, pressure with which these can be applied to opposite frictional surface, e.g. on flywheel, being modifiable to combat slipping
FR2822908A1 (en) * 2001-03-26 2002-10-04 Zf Sachs Ag Multi-disc clutch comprises inertia mass connected to cover rotating around same axis, pressure plate rotates with casing and inertia mass to form unit acted upon by force accumulator
EP1881220A1 (en) * 2006-07-20 2008-01-23 Zf Friedrichshafen Ag Clutch disc for a friction clutch
FR2922282A1 (en) * 2007-10-10 2009-04-17 Valeo Embrayages Friction disk for motor vehicle's clutch, has web's internal teeth presenting radial and angular clearances with hub's external teeth, and transmission disk including middle part with axial and radial flexibility connecting peripheral parts
DE102010053931A1 (en) * 2009-12-21 2011-06-22 Schaeffler Technologies GmbH & Co. KG, 91074 Frictional lining spring for motor vehicle friction clutch, has frictional partner whose thermal deformation is compensated by large spring path in compression force direction with smaller radial distance to rotational axis of clutch

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272328A1 (en) 1986-05-26 1988-06-29 Kabushiki Kaisha Daikin Seisakusho Structure for suppressing vibration of clutch disc
FR2769057A1 (en) * 1997-09-30 1999-04-02 Exedy Corp Frictional disc clutch
FR2812698A1 (en) * 2000-08-07 2002-02-08 Mannesmann Sachs Ag Clutch disk comprises hub with frictional components arranged around its periphery, pressure with which these can be applied to opposite frictional surface, e.g. on flywheel, being modifiable to combat slipping
FR2822908A1 (en) * 2001-03-26 2002-10-04 Zf Sachs Ag Multi-disc clutch comprises inertia mass connected to cover rotating around same axis, pressure plate rotates with casing and inertia mass to form unit acted upon by force accumulator
EP1881220A1 (en) * 2006-07-20 2008-01-23 Zf Friedrichshafen Ag Clutch disc for a friction clutch
FR2922282A1 (en) * 2007-10-10 2009-04-17 Valeo Embrayages Friction disk for motor vehicle's clutch, has web's internal teeth presenting radial and angular clearances with hub's external teeth, and transmission disk including middle part with axial and radial flexibility connecting peripheral parts
DE102010053931A1 (en) * 2009-12-21 2011-06-22 Schaeffler Technologies GmbH & Co. KG, 91074 Frictional lining spring for motor vehicle friction clutch, has frictional partner whose thermal deformation is compensated by large spring path in compression force direction with smaller radial distance to rotational axis of clutch

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FR3011298A1 (en) 2015-04-03
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