WO2008001001A1 - Friction washer for friction clutch - Google Patents

Friction washer for friction clutch Download PDF

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Publication number
WO2008001001A1
WO2008001001A1 PCT/FR2007/051515 FR2007051515W WO2008001001A1 WO 2008001001 A1 WO2008001001 A1 WO 2008001001A1 FR 2007051515 W FR2007051515 W FR 2007051515W WO 2008001001 A1 WO2008001001 A1 WO 2008001001A1
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WO
WIPO (PCT)
Prior art keywords
friction
friction ring
stud
ring
projection
Prior art date
Application number
PCT/FR2007/051515
Other languages
French (fr)
Inventor
Roel Verhoog
Olivier Hudon
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 DE112007001506T priority Critical patent/DE112007001506T5/en
Publication of WO2008001001A1 publication Critical patent/WO2008001001A1/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
    • 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
    • F16F15/129—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 characterised by friction-damping means

Definitions

  • the invention relates to a friction washer for a friction clutch, to a friction clutch damping hub comprising such a friction washer and to a friction clutch comprising such a damping hub.
  • friction clutches which comprise a damping device intended in particular to filter the engine acyclisms before they propagate at the gearbox and they thus cause noises and uncomfortable shocks for the passengers of the motor vehicle.
  • This damping device is arranged radially between a corrugated hub adapted to be secured in rotation with a driven shaft (for example the input shaft of the gearbox) and a friction disk adapted to be secured in rotation with a a motor shaft (for example the motor output shaft).
  • a damping device 10 of known type is shown in Figure 1, in a partially cutaway view.
  • the damping device 10 comprises, on the one hand, a web 12 secured to the friction disk and having recesses 14 and a guide washer 16 having recesses 18 substantially identical to the recesses 14 of the web 12, springs (not shown) being housed in the recesses 14, 18 so as to bear on both the web 12 and the guide washer 16.
  • the springs absorb the vibrations of the motor and prevent their transmission to the input shaft of the box speeds.
  • the damping device 10 comprises, in a conventional manner, between the web 12 and the guide washer 16, a resilient support washer 20 which holds a friction washer 22 pressed against the web 12, in order to dissipate the energy stored by the springs by friction of the friction washer 22 against the web 12.
  • this friction washer 22 is made of high density polyethylene (HDPE) or Teflon® while the web is metal, so that it either the friction washer 22 which wears by friction on the web 12.
  • the friction washer 22 has a substantially flat friction ring 24 intended to be pressed against the web 12 and four studs 26 extending in a direction substantially perpendicular to the friction ring 24.
  • Connecting means 28 connect each stud 26 to the ring of In conventional manner, these connecting means are in the form of tongues 28 extending from the friction ring 24 to a pad 26 in the plane of the friction ring 24. The pads 26 are inserted into force in complementary recesses made in the guide washer 16.
  • This set of studs 26 in the complementary recesses 30 causes a phenomenon known as a "drawer effect" which results in the fact that in case of relative rotation of the web 12 relative to the guide washer 16, as long as the pads 26 are not in contact with the edge of the complementary recesses 30, no energy is dissipated by the damping device 10.
  • the vibrations of the motor are transmitted to the input shaft of the gearbox , at least as long as the play of the studs 26 in the recesses 30 is not "caught".
  • An object of the invention is therefore to provide a friction washer ensuring its function of energy dissipation by friction against the web or against a guide ring of a vibration damper which is less subject to wear by matting of its connecting pads and which is therefore able to reduce or avoid the phenomenon of drawer effect in the friction clutch damping devices.
  • This object of the invention is achieved by means of a friction washer for a friction clutch, in particular for a motor vehicle, comprising a substantially plane friction ring, at least one stud extending in a direction substantially perpendicular to a plane of friction.
  • the friction ring and connecting means which connect the stud to the friction ring, remarkable in that the connecting means are able to deform elastically so as to allow movement in a direction substantially normal to the plane of the friction ring of the friction ring relative to the stud.
  • the friction washer according to the invention makes it possible to transmit a couple without play but with an axial flexibility to not interfere with the axial load of the application washer.
  • the pads are less subject to the phenomenon of matting and substantially reduces the risk of occurrence of the phenomenon of drawer effect.
  • Another advantage of the invention is that the shape of the pads can be preserved. Thus, the elements of the damping device do not require any modification to be adapted to the friction washer according to the invention.
  • the friction washer according to the invention has one or more of the following characteristics, taken alone or in combination:
  • the connecting means are formed in the form of a projection of the friction ring, substantially coplanar with the friction ring, which connects the stud to the friction ring and which one day radially between the pad and the friction ring;
  • the stud has a substantially rectangular section whose long sides extend substantially perpendicular to the radial direction of the friction ring; the projection comprises a portion directly adjacent to the friction ring, which extends substantially tangentially to the friction ring;
  • the projection further comprises a second portion connecting the first portion to the stud, which extends substantially in a circular arc concentric to the friction ring;
  • the projection has a substantially trapezoidal shape whose large base is integral with the friction ring, the pad being disposed radially between the large base and the small base of the projection;
  • a slot is made in the projection, to the right of the radially inner surface of the pad; - The slot further extends along the stud in at least a substantially radial direction of the friction ring;
  • the slot extends, in the radial direction of the friction ring, beyond the stud;
  • the invention also relates to a damping hub comprising a friction washer as described above, in all its combinations, and to a friction clutch comprising such a damper hub.
  • FIG. 1 represents a detail of a friction clutch of known type, in partially torn-up view
  • FIG. 2 represents a friction washer according to a first preferred embodiment of the invention
  • Figure 3 shows a friction washer according to a second preferred embodiment of the invention.
  • the friction washer 32 for friction clutch shown in FIG. 2 comprises a substantially plane friction ring 24, four studs 26 extending in a direction substantially perpendicular to the friction ring 24 and connecting means 34 which connect each stud 26 to the friction ring
  • the connecting means 34 are made in the form of a projection 36 of the friction ring 24, substantially coplanar with the friction ring 24, which connects a stud 26 to the friction ring 24 and which cleans a day 38 radially between the stud 26 and the friction ring 24.
  • the projection 36 comprises a portion 40 directly adjacent to the friction ring 24, which extends radially outside the friction ring 24 and substantially tangentially to the friction ring 24.
  • a second portion 42 projection 36 connects the first portion 40 of the projection 36 to the pad 26, the second portion 42 of the projection 36 extending substantially in a circular arc concentric with the friction ring 24.
  • the stud 26 preferably has a substantially rectangular section whose long sides 44 extend substantially perpendicular to a radial direction of the friction ring 24.
  • this friction washer 32 is mounted in a known type of damping device of a friction clutch known as described in the preamble of the present patent application, by inserting the studs 26 in force in recesses made in a guide washer. Despite the wear of the friction washer, it is maintained pressed against the web of the damping device of the friction clutch under the effect of the support washer.
  • the friction washer 32 comprises connecting means 34 of the pads 26 with the friction ring 24 adapted to deform elastically in a direction substantially normal to the plane of the friction ring 24 so as to allow displacement of the pad 26 relative to the friction ring 24 in a direction substantially normal to said plane.
  • it reduces the forces exerted between the pads 26 and the edge of the complementary recesses 30 in which they are inserted.
  • the wear of the pads 26 at the origin of the play of the pads 26 in the complementary recesses 30 and thus the effect of the drawer effect is reduced by the same.
  • the embodiment of projections 36 according to the first embodiment of the invention presented aims to increase the desired elasticity of the projections 36 in the normal direction to the plane of the friction ring 24 while ensuring a good maintenance of the relative position of the pads 26 and the friction ring 24, in the plane of the latter.
  • FIG. 3 shows a friction washer 46 according to a second preferred embodiment of the invention.
  • each stud 26 with the friction ring are in the form of a projection 48 preferably having a substantially trapezoidal shape
  • the large base is integral with the friction ring 24 while the stud 26 is disposed radially between the large base and the small base of the projection 48.
  • a slot 50 is formed in this projection, in line with the radially inner surface 52 of the stud 26.
  • the slot 50 further extends along the pad 26 in at least one substantially radial direction of the friction ring 24, preferably in two substantially radial directions on either side of the pad 26, and extends, in the or the two substantially radial directions of the friction ring 24, beyond the stud 26.
  • a recess 54 is formed at the small base of the projection 48. This recess 54 also improves the elasticity of the connecting means 48.
  • connection means of the pads with the ring which are suitable for elastically deform so as to allow a displacement in a direction substantially normal to the plane of the friction ring of the stud relative to the friction ring, so as to limit the wear by matting of the bonding pads.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

This friction washer for a friction clutch, particularly for a motor vehicle, comprising a substantially flat friction ring (24), at least one stud (26) extending in a direction substantially perpendicular to the friction ring (24) and connecting means (34) which connect the stud (26) to the friction ring (24) is notable in that the connecting means (34) are able to deform elastically so as to allow the stud (26) to move relative to the friction ring (24) in a direction substantially normal to the plane of the friction ring (24). The invention also relates to a damping hub of a friction clutch comprising such a friction washer and to a friction clutch comprising such a damping hub.

Description

Rondelle de frottement pour embrayage à friction Friction washer for friction clutch
L'invention se rapporte à une rondelle de frottement pour embrayage à friction, à un moyeu amortisseur d'embrayage à friction comportant une telle rondelle de frottement et à un embrayage à friction comportant un tel moyeu amortisseur.The invention relates to a friction washer for a friction clutch, to a friction clutch damping hub comprising such a friction washer and to a friction clutch comprising such a damping hub.
Il est connu, notamment dans le domaine automobile, des embrayages à friction qui comportent un dispositif amortisseur destiné notamment à filtrer les acyclismes du moteur avant qu'ils ne se propagent au niveau de la boîte de vitesses et qu'ils ne provoquent ainsi des bruits et des chocs inconfortables pour les passagers du véhicule automobile. Ce dispositif amortisseur est disposé radialement entre un moyeu cannelé apte à être rendu solidaire en rotation d'un arbre mené (par exemple l'arbre d'entrée de la boîte de vitesses) et un disque de friction apte à être rendu solidaire en rotation d'un arbre moteur (par exemple l'arbre de sortie du moteur). Un tel dispositif amortisseur 10 de type connu est représenté sur la figure 1 , en vue partiellement arrachée. Le dispositif amortisseur 10 comporte, d'une part, un voile 12 solidaire du disque de friction et présentant des évidements 14 et une rondelle de guidage 16 comportant des évidements 18 sensiblement identiques aux évidements 14 du voile 12, des ressorts (non représentés) étant logés dans les évidements 14, 18 de manière à prendre appui à la fois sur le voile 12 et sur le rondelle de guidage 16. Ainsi, les ressorts absorbent les vibrations du moteur et évitent leur transmission à l'arbre d'entrée de la boîte de vitesses.It is known, particularly in the automotive field, friction clutches which comprise a damping device intended in particular to filter the engine acyclisms before they propagate at the gearbox and they thus cause noises and uncomfortable shocks for the passengers of the motor vehicle. This damping device is arranged radially between a corrugated hub adapted to be secured in rotation with a driven shaft (for example the input shaft of the gearbox) and a friction disk adapted to be secured in rotation with a a motor shaft (for example the motor output shaft). Such a damping device 10 of known type is shown in Figure 1, in a partially cutaway view. The damping device 10 comprises, on the one hand, a web 12 secured to the friction disk and having recesses 14 and a guide washer 16 having recesses 18 substantially identical to the recesses 14 of the web 12, springs (not shown) being housed in the recesses 14, 18 so as to bear on both the web 12 and the guide washer 16. Thus, the springs absorb the vibrations of the motor and prevent their transmission to the input shaft of the box speeds.
Par ailleurs, le dispositif amortisseur 10 comporte, de manière classique, entre le voile 12 et la rondelle de guidage 16, une rondelle d'appui 20 élastique qui maintient une rondelle de frottement 22 plaquée contre le voile 12, afin de dissiper l'énergie emmagasinée par les ressorts par frottement de la rondelle de frottement 22 contre le voile 12. De préférence, cette rondelle de frottement 22 est réalisée en polyéthylène haute densité (PEHD) ou en Téflon® tandis que le voile est en métal, de manière que ce soit la rondelle de frottement 22 qui s'use par frottement sur le voile 12.Furthermore, the damping device 10 comprises, in a conventional manner, between the web 12 and the guide washer 16, a resilient support washer 20 which holds a friction washer 22 pressed against the web 12, in order to dissipate the energy stored by the springs by friction of the friction washer 22 against the web 12. Preferably, this friction washer 22 is made of high density polyethylene (HDPE) or Teflon® while the web is metal, so that it either the friction washer 22 which wears by friction on the web 12.
De manière connue, la rondelle de frottement 22 présente un anneau de frottement 24 sensiblement plan destiné à être plaqué contre le voile 12 et quatre plots 26 s'étendant dans une direction sensiblement perpendiculaire à l'anneau de frottement 24. Des moyens de liaison 28 relient chaque plot 26 à l'anneau de frottement 24. De manière classique, ces moyens de liaisons sont réalisés sous la forme de languettes 28 s'étendant depuis l'anneau de frottement 24 jusqu'à un plot 26, dans le plan de l'anneau de frottement 24. Les plots 26 sont insérés en force dans des évidements 30 complémentaires réalisés dans la rondelle de guidage 16. Cependant, du fait de la liberté de mouvement souhaitée de l'anneau de frottement 24 de la rondelle de frottement 22 par rapport à la rondelle de guidage 16 selon une direction sensiblement normale à l'axe des rondelles de guidage 16 et de frottement 24, d'une part, et, d'autre part, du fait des sollicitations des rondelles de guidage 16 et de frottement 24 dues aux couples mis en jeu, il se crée une usure, ou matage, des plots 26 et, à terme, un jeu orthoradial des plots 26 de la rondelle de frottement 24 dans les évidements complémentaires 30 ménagés dans la rondelle de guidage 16 apparaît.In known manner, the friction washer 22 has a substantially flat friction ring 24 intended to be pressed against the web 12 and four studs 26 extending in a direction substantially perpendicular to the friction ring 24. Connecting means 28 connect each stud 26 to the ring of In conventional manner, these connecting means are in the form of tongues 28 extending from the friction ring 24 to a pad 26 in the plane of the friction ring 24. The pads 26 are inserted into force in complementary recesses made in the guide washer 16. However, because of the desired freedom of movement of the friction ring 24 of the friction washer 22 relative to the guide washer 16 according to a substantially normal direction to the axis of the guide washers 16 and friction 24, on the one hand, and, secondly, because of the stresses of the guide washers 16 and friction 24 due to the couples involved, it wear, or matting, pads 26 and, ultimately, an orthoradial game pads 26 of the friction washer 24 in the complementary recesses 30 formed in the guide ring 16 appears.
Ce jeu des plots 26 dans les évidements complémentaires 30 provoque un phénomène connu sous le nom d'« effet tiroir » qui se traduit par le fait qu'en cas de rotation relative du voile 12 par rapport à la rondelle de guidage 16, tant que les plots 26 ne sont pas en contact avec le bord des évidements complémentaires 30, aucune énergie n'est dissipée par le dispositif amortisseur 10. Il en résulte que les vibrations du moteur sont transmises à l'arbre d'entrée de la boîte de vitesses, du moins tant que le jeu des plots 26 dans les évidements 30 n'est pas « rattrapé ». Un but de l'invention est donc de proposer une rondelle de frottement assurant sa fonction de dissipation d'énergie par frottement contre le voile ou contre une rondelle de guidage d'un amortisseur de vibration qui soit moins sujette à l'usure par matage de ses plots de liaison et qui soit donc à même de réduire voir d'éviter le phénomène d'effet tiroir dans les dispositifs d'amortissement d'embrayage à friction. On atteint ce but de l'invention au moyen d'une rondelle de frottement pour embrayage à friction, notamment pour véhicule automobile, comportant un anneau de frottement sensiblement plan, au moins un plot s'étendant dans une direction sensiblement perpendiculaire à un plan de l'anneau de frottement et des moyens de liaison qui relient le plot à l'anneau de frottement, remarquable en ce que les moyens de liaison sont aptes à se déformer élastiquement de manière à permettre un déplacement selon une direction sensiblement normale au plan de l'anneau de frottement de l'anneau de frottement par rapport au plot.This set of studs 26 in the complementary recesses 30 causes a phenomenon known as a "drawer effect" which results in the fact that in case of relative rotation of the web 12 relative to the guide washer 16, as long as the pads 26 are not in contact with the edge of the complementary recesses 30, no energy is dissipated by the damping device 10. As a result, the vibrations of the motor are transmitted to the input shaft of the gearbox , at least as long as the play of the studs 26 in the recesses 30 is not "caught". An object of the invention is therefore to provide a friction washer ensuring its function of energy dissipation by friction against the web or against a guide ring of a vibration damper which is less subject to wear by matting of its connecting pads and which is therefore able to reduce or avoid the phenomenon of drawer effect in the friction clutch damping devices. This object of the invention is achieved by means of a friction washer for a friction clutch, in particular for a motor vehicle, comprising a substantially plane friction ring, at least one stud extending in a direction substantially perpendicular to a plane of friction. the friction ring and connecting means which connect the stud to the friction ring, remarkable in that the connecting means are able to deform elastically so as to allow movement in a direction substantially normal to the plane of the friction ring of the friction ring relative to the stud.
Ainsi, comme il apparaîtra plus en détails au vu de la description qui va être donnée de l'invention, la rondelle de frottement selon l'invention permet de transmettre un couple sans jeu mais avec une souplesse axiale pour ne pas interférer sur la charge axiale de la rondelle d'application. En outre, il est ainsi possible d'assurer le blocage circonférentiel de la rondelle de frottement par rapport à la rondelle de guidage, tout en permettant le déplacement axial de rattrapage d'usure de l'anneau de frottement. Il en résulte que les plots sont moins sujets au phénomène de matage et on réduit ainsi de manière substantielle les risques d'apparition du phénomène d'effet tiroir.Thus, as will appear in more detail in view of the description that will be given of the invention, the friction washer according to the invention makes it possible to transmit a couple without play but with an axial flexibility to not interfere with the axial load of the application washer. In addition, it is thus possible to ensure the circumferential locking of the friction washer relative to the guide ring, while allowing the axial displacement of the wear ring of the friction ring. As a result, the pads are less subject to the phenomenon of matting and substantially reduces the risk of occurrence of the phenomenon of drawer effect.
Un autre avantage de l'invention consiste en ce que la forme des plots peut être conservée. Ainsi, les éléments du dispositif amortisseur ne nécessitent aucune modification pour être adaptés à la rondelle de frottement selon l'invention.Another advantage of the invention is that the shape of the pads can be preserved. Thus, the elements of the damping device do not require any modification to be adapted to the friction washer according to the invention.
De préférence, la rondelle de frottement selon l'invention présente une ou plusieurs des caractéristiques suivantes, prises seules ou en combinaison :Preferably, the friction washer according to the invention has one or more of the following characteristics, taken alone or in combination:
- les moyens de liaison sont réalisés sous la forme d'une projection de l'anneau de frottement, sensiblement coplanaire à l'anneau de frottement, qui relie le plot à l'anneau de frottement et qui ménage un jour radialement entre le plot et l'anneau de frottement ;- The connecting means are formed in the form of a projection of the friction ring, substantially coplanar with the friction ring, which connects the stud to the friction ring and which one day radially between the pad and the friction ring;
- le plot présente une section sensiblement rectangulaire dont les grands côtés s'étendent sensiblement perpendiculairement à la direction radiale de l'anneau de frottement ; - la projection comprend une partie directement adjacente à l'anneau de frottement, qui s'étend sensiblement tangentiellement à l'anneau de frottement ;- The stud has a substantially rectangular section whose long sides extend substantially perpendicular to the radial direction of the friction ring; the projection comprises a portion directly adjacent to the friction ring, which extends substantially tangentially to the friction ring;
- la projection comporte en outre une seconde partie reliant la première partie au plot, qui s'étend sensiblement selon un arc de cercle concentrique à l'anneau de frottement ; - la projection présente une forme sensiblement de trapèze dont la grande base est solidaire de l'anneau de frottement, le plot étant disposé radialement entre la grande base et la petite base de la projection ;- The projection further comprises a second portion connecting the first portion to the stud, which extends substantially in a circular arc concentric to the friction ring; - The projection has a substantially trapezoidal shape whose large base is integral with the friction ring, the pad being disposed radially between the large base and the small base of the projection;
- une fente est réalisée dans la projection, au droit de la surface radialement interne du plot ; - la fente s'étend de plus le long du plot selon au moins une direction sensiblement radiale de l'anneau de frottement ;- A slot is made in the projection, to the right of the radially inner surface of the pad; - The slot further extends along the stud in at least a substantially radial direction of the friction ring;
- la fente se prolonge, dans la direction radiale de l'anneau de frottement, au- delà du plot ; etthe slot extends, in the radial direction of the friction ring, beyond the stud; and
- un renfoncement est ménagé au niveau de la petite base de la projection. L'invention se rapporte également à un moyeu amortisseur comportant une rondelle de frottement telle que décrite ci-avant, dans toutes ses combinaisons, ainsi qu'à un embrayage à friction comportant un tel moyeu amortisseur.- a recess is created at the level of the small base of the projection. The invention also relates to a damping hub comprising a friction washer as described above, in all its combinations, and to a friction clutch comprising such a damper hub.
D'autres avantages et caractéristiques de l'invention apparaîtront au vu de la description qui va être faite de l'invention en regard des figures ci-annexées sur lesquelles : la figure 1 représente un détail d'un embrayage à friction de type connu, en vue partiellement arrachée ; la figure 2 représente une rondelle de frottement selon un premier mode de réalisation préféré de l'invention ; et la figure 3 représente une rondelle de frottement selon un deuxième mode de réalisation préféré de l'invention.Other advantages and characteristics of the invention will become apparent from the description which will be given of the invention with reference to the appended figures in which: FIG. 1 represents a detail of a friction clutch of known type, in partially torn-up view; FIG. 2 represents a friction washer according to a first preferred embodiment of the invention; and Figure 3 shows a friction washer according to a second preferred embodiment of the invention.
Dans la suite de la description, les éléments identiques ou de fonction identique sont repérés par le même signe de référence. On se réfère désormais à la figure 2 sur laquelle est représentée une rondelle de frottement selon un premier mode de réalisation préféré de l'invention.In the rest of the description, the identical elements or identical function are identified by the same reference sign. Referring now to Figure 2 which shows a friction washer according to a first preferred embodiment of the invention.
La rondelle de frottement 32 pour embrayage à friction représentée à la figure 2 comporte un anneau de frottement 24 sensiblement plan, quatre plots 26 s'étendant dans une direction sensiblement perpendiculaire à l'anneau de frottement 24 et des moyens de liaison 34 qui relient chaque plot 26 à l'anneau de frottementThe friction washer 32 for friction clutch shown in FIG. 2 comprises a substantially plane friction ring 24, four studs 26 extending in a direction substantially perpendicular to the friction ring 24 and connecting means 34 which connect each stud 26 to the friction ring
24.24.
Selon le premier mode de réalisation préféré de l'invention représenté ici, les moyens de liaison 34 sont réalisés sous la forme d'une projection 36 de l'anneau de frottement 24, sensiblement coplanaire à cet anneau de frottement 24, qui relie un plot 26 à l'anneau de frottement 24 et qui ménage un jour 38 radialement entre le plot 26 et l'anneau de frottement 24.According to the first preferred embodiment of the invention shown here, the connecting means 34 are made in the form of a projection 36 of the friction ring 24, substantially coplanar with the friction ring 24, which connects a stud 26 to the friction ring 24 and which cleans a day 38 radially between the stud 26 and the friction ring 24.
Plus précisément, la projection 36 comprend une partie 40 directement adjacente à l'anneau de frottement 24, qui s'étend radialement à l'extérieur de l'anneau de frottement 24 et sensiblement tangentiellement à cet anneau de frottement 24. Une seconde partie 42 de la projection 36 relie la première partie 40 de la projection 36 au plot 26, cette seconde partie 42 de la projection 36 s'étendant sensiblement selon un arc de cercle concentrique à l'anneau de frottement 24. Le plot 26 présente de préférence une section sensiblement rectangulaire dont les grands côtés 44 s'étendent sensiblement perpendiculairement à une direction radiale de l'anneau de frottement 24.More specifically, the projection 36 comprises a portion 40 directly adjacent to the friction ring 24, which extends radially outside the friction ring 24 and substantially tangentially to the friction ring 24. A second portion 42 projection 36 connects the first portion 40 of the projection 36 to the pad 26, the second portion 42 of the projection 36 extending substantially in a circular arc concentric with the friction ring 24. The stud 26 preferably has a substantially rectangular section whose long sides 44 extend substantially perpendicular to a radial direction of the friction ring 24.
Le fonctionnement de la rondelle de frottement 32 selon l'invention découle directement de la description détaillée qui vient d'en être donnée.The operation of the friction washer 32 according to the invention follows directly from the detailed description which has just been given.
Ainsi, cette rondelle de frottement 32 se monte dans un dispositif d'amortissement de type connu d'un embrayage à friction connu tel que décrit dans le préambule de la présente demande de brevet, en insérant les plots 26 en force dans des évidements réalisés dans une rondelle de guidage. Malgré l'usure de la rondelle de frottement, celle-ci est maintenue plaquée contre le voile du dispositif amortisseur de l'embrayage à friction sous l'effet de la rondelle d'appui.Thus, this friction washer 32 is mounted in a known type of damping device of a friction clutch known as described in the preamble of the present patent application, by inserting the studs 26 in force in recesses made in a guide washer. Despite the wear of the friction washer, it is maintained pressed against the web of the damping device of the friction clutch under the effect of the support washer.
Cependant, contrairement à une rondelle de frottement connue, la rondelle de frottement 32 selon le premier mode de réalisation de l'invention comporte des moyens de liaison 34 des plots 26 avec l'anneau de frottement 24 aptes à se déformer élastiquement selon une direction sensiblement normale au plan de l'anneau de frottement 24 de manière à permettre un déplacement du plot 26 par rapport à l'anneau de frottement 24 selon une direction sensiblement normale audit plan. Ainsi, avantageusement, on réduit les efforts s'exerçant entre les plots 26 et le bord des évidements complémentaires 30 dans lesquels ils sont insérés. On réduit par la même l'usure des plots 26 à l'origine du jeu des plots 26 dans les évidements complémentaires 30 et donc le phénomène d'effet tiroir.However, unlike a known friction washer, the friction washer 32 according to the first embodiment of the invention comprises connecting means 34 of the pads 26 with the friction ring 24 adapted to deform elastically in a direction substantially normal to the plane of the friction ring 24 so as to allow displacement of the pad 26 relative to the friction ring 24 in a direction substantially normal to said plane. Thus, advantageously, it reduces the forces exerted between the pads 26 and the edge of the complementary recesses 30 in which they are inserted. The wear of the pads 26 at the origin of the play of the pads 26 in the complementary recesses 30 and thus the effect of the drawer effect is reduced by the same.
En outre, le mode de réalisation des projections 36 selon le premier mode réalisation de l'invention présenté vise à accroître l'élasticité voulue des projections 36 selon la direction normale au plan de l'anneau de frottement 24 tout en assurant un bon maintien de la position relative des plots 26 et de l'anneau de frottement 24, dans le plan de ce dernier.In addition, the embodiment of projections 36 according to the first embodiment of the invention presented aims to increase the desired elasticity of the projections 36 in the normal direction to the plane of the friction ring 24 while ensuring a good maintenance of the relative position of the pads 26 and the friction ring 24, in the plane of the latter.
On se réfère désormais à la figure 3 sur laquelle est représentée une rondelle de frottement 46 selon un deuxième mode de réalisation préféré de l'invention.Referring now to Figure 3 which shows a friction washer 46 according to a second preferred embodiment of the invention.
Selon ce second mode de réalisation préféré, les moyens de liaison de chaque plot 26 avec l'anneau de frottement sont réalisés sous forme d'une projection 48 présentant de préférence une forme sensiblement de trapèze, dont la grande base est solidaire de l'anneau de frottement 24 tandis que le plot 26 est disposé radialement entre la grande base et la petite base de la projection 48.According to this second preferred embodiment, the connecting means of each stud 26 with the friction ring are in the form of a projection 48 preferably having a substantially trapezoidal shape, the large base is integral with the friction ring 24 while the stud 26 is disposed radially between the large base and the small base of the projection 48.
De manière à assurer l'élasticité nécessaire de la projection 48, une fente 50 est réalisée dans cette projection, au droit de la surface 52 radialement interne du plot 26. Idéalement, de manière à accroître l'élasticité des moyens de liaison, la fente 50 s'étend de plus le long du plot 26 selon au moins une direction sensiblement radiale de l'anneau de frottement 24, de préférence selon deux directions sensiblement radiales de part et d'autre du plot 26, et se prolonge, dans la ou les deux directions sensiblement radiales de l'anneau de frottement 24, au-delà du plot 26.In order to ensure the necessary elasticity of the projection 48, a slot 50 is formed in this projection, in line with the radially inner surface 52 of the stud 26. Ideally, in order to increase the elasticity of the connecting means, the slot 50 further extends along the pad 26 in at least one substantially radial direction of the friction ring 24, preferably in two substantially radial directions on either side of the pad 26, and extends, in the or the two substantially radial directions of the friction ring 24, beyond the stud 26.
De manière idéale, un renfoncement 54 est ménagé au niveau de la petite base de la projection 48. Ce renfoncement 54 permet également d'améliorer l'élasticité des moyens de liaison 48.Ideally, a recess 54 is formed at the small base of the projection 48. This recess 54 also improves the elasticity of the connecting means 48.
L'invention ne se réduit pas aux modes de réalisations présentés ici et de nombreuses modifications sont possibles sans sortir du cadre de l'invention, qui consiste avant tout dans la réalisation de moyens de liaison des plots avec l'anneau qui sont aptes à se déformer élastiquement de manière à permettre un déplacement selon une direction sensiblement normale au plan de l'anneau de frottement du plot par rapport à l'anneau de frottement, de manière à limiter l'usure par matage des plots de liaison. The invention is not limited to the embodiments presented here and many modifications are possible without departing from the scope of the invention, which consists above all in the production of connection means of the pads with the ring which are suitable for elastically deform so as to allow a displacement in a direction substantially normal to the plane of the friction ring of the stud relative to the friction ring, so as to limit the wear by matting of the bonding pads.

Claims

REVENDICATIONS
1. Rondelle de frottement pour embrayage à friction, notamment pour véhicule automobile, comportant un anneau de frottement (24) sensiblement plan, au moins un plot (26) s'étendant dans une direction sensiblement perpendiculaire à un plan de l'anneau de frottement (24) et des moyens de liaison (34, 48) qui relient le plot (26) à l'anneau de frottement (24), les moyens de liaison (34, 48) étant aptes à se déformer élastiquement de manière à permettre un déplacement de l'anneau de frottement (24) par rapport au plot (26) selon une direction sensiblement normale au plan de l'anneau de frottement (24), ladite rondelle étant caractérisée en ce que les moyens de liaison (34, 48) sont réalisés sous la forme d'une projection de l'anneau de frottement (24), sensiblement coplanaire à l'anneau de frottement (24), qui relie le plot (26) à l'anneau de frottement (24) et qui ménage un jour (38, 50) radialement entre le plot (26) et l'anneau de frottement (24).1. Friction washer for friction clutch, in particular for a motor vehicle, comprising a substantially plane friction ring (24), at least one stud (26) extending in a direction substantially perpendicular to a plane of the friction ring (24) and connecting means (34, 48) which connect the stud (26) to the friction ring (24), the connecting means (34, 48) being able to deform elastically so as to allow a displacement of the friction ring (24) relative to the stud (26) in a direction substantially normal to the plane of the friction ring (24), said washer being characterized in that the connecting means (34, 48) are made in the form of a projection of the friction ring (24), substantially coplanar with the friction ring (24), which connects the stud (26) to the friction ring (24) and which is cleaning one day (38, 50) radially between the stud (26) and the friction ring (24).
2. Rondelle de frottement selon la revendication précédente, caractérisée en ce que le plot (26) présente une section sensiblement rectangulaire dont les grands côtés (44, 52) s'étendent sensiblement perpendiculairement à la direction radiale de l'anneau de frottement (24). 2. friction washer according to the preceding claim, characterized in that the stud (26) has a substantially rectangular section whose long sides (44, 52) extend substantially perpendicular to the radial direction of the friction ring (24). ).
3. Rondelle de frottement selon l'une des revendications précédentes, caractérisée en ce que la projection comprend une partie directement adjacente à l'anneau de frottement (40), qui s'étend sensiblement tangentiellement à l'anneau de frottement.3. friction washer according to one of the preceding claims, characterized in that the projection comprises a portion directly adjacent to the friction ring (40), which extends substantially tangentially to the friction ring.
4. Rondelle de frottement selon la revendication précédente, caractérisée en ce que la projection comporte en outre une seconde partie (42) reliant la première partie (40) au plot (26), qui s'étend sensiblement selon un arc de cercle concentrique à l'anneau de frottement (24).4. Friction washer according to the preceding claim, characterized in that the projection further comprises a second portion (42) connecting the first portion (40) to the stud (26), which extends substantially in a circular arc concentric to the friction ring (24).
5. Rondelle de frottement selon l'une des revendications précédentes, caractérisée en ce que la projection (48) présente une forme sensiblement de trapèze dont la grande base est solidaire de l'anneau de frottement (24), le plot (26) étant disposé radialement entre la grande base et la petite base de la projection (48). 5. Friction washer according to one of the preceding claims, characterized in that the projection (48) has a substantially trapezoidal shape whose large base is integral with the friction ring (24), the stud (26) being disposed radially between the large base and the small base of the projection (48).
6. Rondelle de frottement selon l'une des revendications précédentes, caractérisée en ce qu'une fente (50) est réalisée dans la projection (48), au droit de la surface radialement interne (52) du plot (26).6. Friction washer according to one of the preceding claims, characterized in that a slot (50) is formed in the projection (48), in line with the radially inner surface (52) of the stud (26).
7. Rondelle de frottement selon la revendication précédente, caractérisée en ce que la fente (50) s'étend de plus le long du plot (26) selon au moins une direction sensiblement radiale de l'anneau de frottement (24).7. friction washer according to the preceding claim, characterized in that the slot (50) further extends along the stud (26) in at least a substantially radial direction of the friction ring (24).
8. Rondelle de frottement selon la revendication précédente, caractérisée en ce que la fente (50) se prolonge, dans la direction radiale de l'anneau de frottement (24), au-delà du plot (26). 8. Friction washer according to the preceding claim, characterized in that the slot (50) extends in the radial direction of the friction ring (24) beyond the stud (26).
9. Rondelle de frottement selon l'une des revendications 5 à 8, caractérisée en ce qu'un renfoncement (54) est ménagé au niveau de la petite base de la projection.9. friction washer according to one of claims 5 to 8, characterized in that a recess (54) is provided at the small base of the projection.
10. Moyeu amortisseur comportant une rondelle de frottement selon l'une quelconque des revendications précédentes. 10. damping hub comprising a friction washer according to any one of the preceding claims.
1 1. Embrayage à friction caractérisé en ce que en ce qu'il comporte un moyeu amortisseur conforme à la revendication précédente. 1 1. friction clutch characterized in that it comprises a damping hub according to the preceding claim.
PCT/FR2007/051515 2006-06-28 2007-06-25 Friction washer for friction clutch WO2008001001A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112007001506T DE112007001506T5 (en) 2006-06-28 2007-06-25 Friction disc for a friction clutch

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0652686 2006-06-28
FR0652686A FR2903159B1 (en) 2006-06-28 2006-06-28 FRICTION CLUTCH FRICTION WASHER

Publications (1)

Publication Number Publication Date
WO2008001001A1 true WO2008001001A1 (en) 2008-01-03

Family

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Application Number Title Priority Date Filing Date
PCT/FR2007/051515 WO2008001001A1 (en) 2006-06-28 2007-06-25 Friction washer for friction clutch

Country Status (3)

Country Link
DE (1) DE112007001506T5 (en)
FR (1) FR2903159B1 (en)
WO (1) WO2008001001A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014053128A1 (en) * 2012-10-01 2014-04-10 Schaeffler Technologies AG & Co. KG Torsional vibration damper and a friction ring for same
FR3070457A1 (en) * 2017-08-30 2019-03-01 Valeo Embrayages FRICTION DEVICE FOR CLUTCH

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851147A1 (en) * 1996-12-31 1998-07-01 Valeo Friction ring and torsional damping unit, especially for automotive vehicles, which makes use of such a friction ring.
JP2000179622A (en) * 1998-12-15 2000-06-27 Exedy Corp Frictional bush
FR2826083A1 (en) * 2001-06-15 2002-12-20 Valeo Torsion damper comprises first and second elements, able to oscillate around common axis, connected by principal damper, friction washer pressed against second element surface by axial spring

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851147A1 (en) * 1996-12-31 1998-07-01 Valeo Friction ring and torsional damping unit, especially for automotive vehicles, which makes use of such a friction ring.
JP2000179622A (en) * 1998-12-15 2000-06-27 Exedy Corp Frictional bush
FR2826083A1 (en) * 2001-06-15 2002-12-20 Valeo Torsion damper comprises first and second elements, able to oscillate around common axis, connected by principal damper, friction washer pressed against second element surface by axial spring

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014053128A1 (en) * 2012-10-01 2014-04-10 Schaeffler Technologies AG & Co. KG Torsional vibration damper and a friction ring for same
FR3070457A1 (en) * 2017-08-30 2019-03-01 Valeo Embrayages FRICTION DEVICE FOR CLUTCH
WO2019043336A1 (en) * 2017-08-30 2019-03-07 Valeo Embrayages Friction device for clutch

Also Published As

Publication number Publication date
FR2903159B1 (en) 2009-03-13
FR2903159A1 (en) 2008-01-04
DE112007001506T5 (en) 2009-05-07

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