WO2000000754A1 - Clutch mechanism, for friction clutch - Google Patents

Clutch mechanism, for friction clutch Download PDF

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Publication number
WO2000000754A1
WO2000000754A1 PCT/FR1999/001500 FR9901500W WO0000754A1 WO 2000000754 A1 WO2000000754 A1 WO 2000000754A1 FR 9901500 W FR9901500 W FR 9901500W WO 0000754 A1 WO0000754 A1 WO 0000754A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
ribs
mechanism according
diaphragm
clutch
Prior art date
Application number
PCT/FR1999/001500
Other languages
French (fr)
Inventor
Laurent Dequesnes
Original Assignee
Valeo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo filed Critical Valeo
Priority to DE19981400T priority Critical patent/DE19981400B4/en
Publication of WO2000000754A1 publication Critical patent/WO2000000754A1/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
    • F16D13/70—Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members
    • F16D13/71—Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members in which the clutching pressure is produced by springs only
    • 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
    • F16D13/583—Diaphragm-springs, e.g. Belleville
    • F16D13/585—Arrangements or details relating to the mounting or support of the diaphragm on the clutch on the clutch cover or the pressure plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00—Friction clutches
    • F16D13/58—Details
    • F16D13/75—Features relating to adjustment, e.g. slack adjusters
    • F16D13/757—Features relating to adjustment, e.g. slack adjusters the adjusting device being located on or inside the clutch cover, e.g. acting on the diaphragm or on the pressure plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00—Friction clutches
    • F16D13/58—Details
    • F16D13/70—Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members
    • F16D2013/706—Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members the axially movable pressure plate is supported by leaf springs

Definitions

  • the present invention relates to friction clutch mechanisms, in particular for a motor vehicle of the type described in documents FR-A-2 728 637, FR-A-2 585424 and FR-A-86 983.
  • This mechanism comprises a cover, a pressure plate linked in rotation to the cover with axial mobility, clutch means bearing on the bottom, which the cover has a hollow shape, to urge the pressure plate in the direction opposite to the bottom of the cover and declutching means to counteract at will the action of declutching means.
  • the engagement and disengagement means belong to the same annular part called a diaphragm, pivotally mounted on the bottom of the cover by assembly means passing axially through enlarged orifices in the diaphragm.
  • the assembly means in the form of tabs or columns, carry, after crossing the diaphragm, a secondary support located opposite a primary support carried by the bottom of the cover.
  • the object of the present invention is to respond to this wish in a simple and economical manner while retaining the advantages of the prior art.
  • the clutch mechanism is characterized in that the ribs have a pointed upper part. Thanks to the invention, the bottom of the cover is stiffer and the clutch efficiency is improved. For the same declutching stroke, a better lifting of the pressure plate is obtained and a better disengagement of the clutch. In addition, thanks to the pointed upper part, the stresses are reduced and the cover can well be stamped to form the outer skirt of the cover.
  • ribs are directed in the opposite direction to the reaction plate. This is applicable to any type of cover and leads to producing the ribs in the bottom of the cover, without profound modification of the tooling. this one.
  • the radial ribs favor the reduction of the stresses and allow to maintain a good geometry of the primary support.
  • the ribs are narrower than those of document US-A-3,630,333.
  • the ribs alternate circumferentially with the assembly means to modify the tooling for manufacturing the cover as little as possible.
  • the bottom of the ribs is radially aligned with a slot in the diaphragm or a false diaphragm pivotally mounted on the bottom of the cover using the aforementioned assembly means.
  • the ribs can affect the internal radial tabs, which the cover has in certain configurations, without destroying the symmetry of such a tab extending radially inward, that is to say towards the center of the mechanism. Not all of these legs have ribs.
  • the ribs have a pointed upper part to reduce stresses and a main rectangular part to stiffen the cover as much as possible.
  • the pointed part allows it to be properly stamped to form the outer peripheral skirt of the cover, while retaining the peripheral part of the cover.
  • the ribs may be more numerous than those of document US-A-
  • the radial ribs are connected together by an annular connection rib surrounding the primary support and allowing good precision for obtaining the primary support, most often produced by stamping the bottom.
  • the ribs extend below the elastic tongues with circumferential action and this, circumferentially at a distance from these.
  • FIG. 1 is a partial front view of the unitary clutch mechanism according to the invention
  • Figures 2 and 3 are half-sectional views along lines 2-2 and 3-3 respectively of Figure 1
  • - Figure 4 is a view similar to Figure 3 for another embodiment.
  • a clutch mechanism forming a unitary assembly intended to be attached to the reaction plate of a clutch after interposition of a friction disc, as visible for example in document FR-86983 to which we can see more details.
  • the reaction plate is linked in rotation to the crankshaft of the internal combustion engine, forming a driving shaft, while the friction disc has an internally grooved hub for its connection in rotation to the input shaft of the gearbox, forming a driven shaft.
  • the reaction plate can be fixed directly on the crankshaft or belong to a double torsional damping flywheel, more precisely belong to the second mass of a double damping flywheel mounted in a rotary manner, by means of bearings, on the central hub of a first mass secured to the crankshaft.
  • the reaction plate is secured to a flexible disc axially fixed to the crankshaft.
  • the friction disc has at its outer periphery two friction faces for contact with friction faces, which respectively have the reaction plate dorsally and frontally a pressure plate 1 belonging to the clutch mechanism.
  • the friction faces belong to at least one friction lining integral with at least one support disc rigidly or resiliently coupled to the hub of the friction disc.
  • the clutch mechanism comprises engaging means 2 and declutching means 3 to counteract at will the action of the engaging means 2, such as a Belleville washer.
  • the declutching means comprise declutching levers, such as the fingers 3 of a diaphragm 4 on the internal end of which acts a declutching stop controlled mechanically, hydraulically and / or electrically.
  • the engaging means 2 and declutching means 3 belong to the same part 4 called a diaphragm, of frustoconical shape in the free state and generally planar when the clutch mechanism is mounted on the reaction plate, the friction disc being new.
  • the diaphragm 4 is pivotally or pivotally mounted on a cover 5 intended to be fixed to the reaction plate.
  • the clutch release bearing on the internal end of the fingers 3 of the diaphragm 4 By acting by pushing with the clutch release bearing on the internal end of the fingers 3 of the diaphragm 4, the latter is tilted to cancel the load it exerts on the pressure plate 1 to release the lining (s) (s) of friction of the friction disc.
  • the clutch mechanism comprises parts of annular shape, namely a cover 5, a pressure plate 1, and a diaphragm 4.
  • the cover 5 of hollow form, has a bottom 51, generally of transverse orientation, extended at its outer periphery by an annular skirt 52, generally of axial orientation, extended at its free end by a rim 53 of transverse orientation directed radially outwards.
  • the rim 53 is provided with holes 54 for the passage of fixing members, usually screws, for fixing the cover 5 to the reaction plate or to a part integral with it, such as the disc.
  • the heads of the fixing screws bear on the flange 53, which is thus a fixing flange.
  • the pressure plate 1 has a friction face 11 frontally in order to, in the aforementioned manner, co-operate with friction with the friction disc.
  • this plate has, in axial projection towards the bottom 51 of the cover, a tertiary support 12 in the form of an annular boss split into a support segment with a pointed end for local contact with the external periphery of the diaphragm 4.
  • the periphery external of the diaphragm 4 consists of a Belleville washer 2 of frustoconical shape in the free state and constituting the engagement means with axial action.
  • This Belleville washer is extended by a central part fragmented into a 3 radial finger by blind 41 slots.
  • the fingers 3 constitute the clutch engagement means.
  • These fingers 3 form release levers, the slots 41 opening into the central opening of the diaphragm.
  • the slots open into enlarged orifices 42 forming the bottom of the slots 41.
  • the orifices 42 are located on the internal periphery of the Belleville washer 2 and are intended to be traversed axially by assembly means 6 so as to subject swivel the diaphragm 4 to the cover 5.
  • the assembly means 6 carry, after axial passage of the diaphragm 4, a secondary support 7 opposite a primary support 8 carried opposite by the cover 5, more precisely by the bottom 51 thereof.
  • the assembly means 6 consist of assembly tabs 6 produced by cutting and folding the bottom 51 of the metal cover 5, here in stamped sheet metal.
  • the assembly tabs 6 pass axially through the orifices 42 and have a free end folded radially outwards in the direction of the external periphery of the reaction plate 1, to form a wedging elbow for a ring crown 70 of frustoconical shape as described in the document
  • the crown 70 has a rounded external edge for forming the secondary support 7 disposed opposite the primary support 8 of the cover formed by stamping the bottom 51.
  • the diaphragm 4 is therefore pinched elastically at the internal periphery of its Belleville washer 2 between the supports 7 and 8 located radially below the tertiary support 12 of the pressure plate 1.
  • the diaphragm 4 is supported on the primary support 8 and the tertiary support 12, to urge the pressure plate 1 in the direction opposite to the bottom 51 of the cover 5 to tighten the friction disc between the plates pressure and reaction.
  • the tongues 13 are here of tangential orientation. Three sets of tabs 13, possibly superimposed, are provided.
  • the tongues 13 are fixed here by riveting at one of their ends to the rim 53 of the cover, having the areas offset axially in the direction of the bottom 51 for this purpose, and at their other end to lugs 14 which have the pressure plate 1 radially projecting therefor.
  • the assembly means consist of shouldered posts carrying two annular rods arranged on either side of the internal periphery of the Belleville washer 2 of the diaphragm, drilling the primary supports and secondary.
  • the secondary support is formed by the heads of the columns 60 profiled in an arc for this purpose and fixed to the bottom 51 of the cover 5 as visible in FIG. 4.
  • the engagement means in addition to the diaphragm, may include a Belleville assistance washer mounted in series or in parallel with the diaphragm.
  • the diaphragm is replaced by a false diaphragm, that is to say a part having the configuration of a diaphragm - continuous peripheral part extended radially inwards by a central part fragmented into radial fingers by slots, whose enlarged orifices are crossed by means of assembly 6- but, the peripheral part of this part is devoid of axial elasticity or has a low axial elasticity, thanks for example to blind slots of radial orientation produced in these parts periphery and opening onto the external periphery thereof.
  • the engagement means consist of a Belleville washer bearing on the cover for action on the peripheral part of the false diaphragm bearing on the tertiary support 12.
  • the bottom 51 of the cover is very deformed slightly axially in one direction when the clutch is engaged under the action exerted by the engagement means 2 and in the other direction during the declutching operation.
  • the primary support 8 is interrupted by the ribs 9 whose radial orientation makes it possible to maintain good geometry of the primary support 8.
  • bottom 51 is serrated at its internal periphery.
  • This bottom has tabs 55, of trapezoidal shape, of radial orientation, directed towards the center of the clutch mechanism.
  • the legs 55 alternate circumferentially with the assembly legs 6 and have a trapezoidal shape.
  • the lugs 55 are wider circumferentially than the assembly lugs 6, each face two fingers 3 and extend radially inwards, radially projecting, relative to the assembly lugs 6.
  • the ribs 9 affect the legs 55 centrally over their height and extend radially above these.
  • the ribs 9 are each in alignment with a slot 41.
  • the bottom 90 of the ribs 9, directed here in the direction opposite to the pressure plate 1, has generally the same width as the upper part of a slot 41.
  • the bottom 90 is a little wider than a slot 41.
  • the upper part 91 of the rib according to the invention has a pointed shape and is connected to the main part 92 of the rib 9 generally of rectangular shape.
  • the ribs here interrupt the primary support 8 and facilitate the evacuation of the oil during the production of the primary support 8 and the ribs 9 with the press.
  • the base of the upper part 91 extends above the primary support 8.
  • the rib has a pointed shape radially above the primary support 8 and has a rectangular shape below.
  • the base of the pointed upper part is connected to an annular connection rib 93 connecting the radial ribs 9 to one another.
  • the rib 93 surrounds the primary support 8 and is directed axially in the opposite direction with respect to the latter, that is to say like the ribs 9 in the direction opposite to the pressure plate 1.
  • the rib 93 allows good evacuation of the oil in combination with the ribs 9. This makes it possible to obtain a very good geometry of the primary support 8.
  • the bottom 51 is rigidified in a simple and economical manner without major modification of the tool since the tabs 55, 6 are preserved as well as the peripheral part 52, 53 of the cover. Only the bottom 51 is affected by the ribs 9.93. The tips of the ribs 9 make it easy to obtain the skirt 52 and the rim 53 by stamping the sheet metal cover.
  • the internal periphery of the bottom 51 can be continuous, the ribs 9 alternating with the assembly means 6 as in the figures. Thanks to the invention, it is possible to use an assistance washer acting in parallel with the diaphragm as described in document FR-A-2 728 637 thanks to the stiffening of the cover.
  • the assistance washer then bears, on the one hand, on the bottom 51 of the cover at the level of the columns and, on the other hand, on the internal end of the fingers of the diaphragm.
  • the tertiary support 12 can belong to a wear take-up device to compensate for the wear of the friction lining (s) of the friction disc, which is usually provided with elastic progressiveness. between its friction linings.
  • the support 12 can therefore belong to a ring provided with ramps cooperating with counter-ramps carried dorsally by the pressure plate to maintain the diaphragm in the same position when the clutch is engaged and for the entire duration of the screw. 'clutch.
  • the ribs 9 extend here in a transverse plane, but as a variant, can be inclined relative to a transverse plane.
  • the pressure plate 1 is linked in rotation to the cover 5 with axial mobility by means of the tongues 13.
  • This cover can be assembled by crimping to the reaction plate or by welding to a disc secured to the reaction plate and fixed to the crankshaft.
  • the cover 5 is therefore fixed in a removable or non-removable manner on the reaction plate.
  • the clutch mechanism can therefore belong to a unitary module comprising the reaction plate.
  • the legs 55 are advantageously stiffened and serve as a support for the diaphragm when the clutch mechanism is in the storage position - mechanism not mounted on the reaction plate - to protect the tabs 13.
  • the legs 55 are therefore retaining lugs.
  • the number of assembly means 6 is less than the number of enlarged orifices 42.
  • the declutching means 3 are pivotally mounted between the primary 7 and secondary 8 supports of annular shape, possibly split.
  • the ramp ring carrying the tertiary support 12 of the diaphragm may have at its outer periphery a toothing suitable for being driven in the event of wear by a worm screw carried by the cover and subjected to the action of a spring actuated by a ratchet wheel, itself subjected to the action of a control tongue operated by an appendage to the diaphragm in the event of wear .
  • the ribs 9 are distributed evenly.
  • all the tabs 55 are provided with ribs 9 directed axially in the direction opposite to the pressure plate 1.
  • certain tabs 55 are provided with ribs 9.
  • the shape of the ribs 9 is well suited to the shape of the trapezoidal legs 55.
  • the stresses are brought back towards the axis of radial symmetry of the legs 55 thanks to the ribs.
  • the rib 93 makes it possible to conserve the geometry of the legs 55 well.
  • a shim can be interposed between the fingers of the diaphragm and the tabs 55 to protect the wear take-up device when the mechanism is in the storage position.
  • the wedge has projecting tabs radially mounted by a bayonet mounting under the tabs 55, the projecting tabs being introduced into the notches delimited by two tabs 55, then mounted under the tabs 55 by rotation. After mounting the assembly of the mechanism on the reaction plate, the shim is removed. The stiffening of the legs 55 is favorable for the insertion of the wedge.
  • the cover 5 can be deeper

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

Abstract

The invention concerns a clutch mechanism comprising a cover (5) with a base (51) and engaging means (2), declutching means (3) borne by the cover (5) base (51) and radial ribs (9) with a pointed upper part provided in said base to stiffen the cover. The invention is applicable to a motor vehicle.

Description

Mécanisme d'embrayage, pour embrayage à friction Clutch mechanism, for friction clutch
La présente invention concerne les mécanismes d'embrayage à friction, en particulier de véhicule automobile du type de ceux décrit dans les documents FR-A- 2 728 637, FR-A-2 585424 et FR-A-86 983.The present invention relates to friction clutch mechanisms, in particular for a motor vehicle of the type described in documents FR-A-2 728 637, FR-A-2 585424 and FR-A-86 983.
Ce mécanisme comporte un couvercle, un plateau de pression lié en rotation au couvercle avec mobilité axiale, des moyens embrayeurs prenant appui sur le fond, que présente le couvercle de forme creuse, pour solliciter le plateau de pression en direction opposée au fond du couvercle et des moyens debrayeurs pour contrecarrer à volonté l'action des moyens debrayeurs. Dans ces documents, les moyens embrayeurs et debrayeurs appartiennent à une même pièce annulaire appelée diaphragme, montée de manière pivotante sur le fond du couvercle par des moyens d'assemblage traversant axialement des orifices élargis du diaphragme. Les moyens d'assemblage, en forme de pattes ou de colonnettes, portent, après traversée du diaphragme, un appui secondaire implanté en vis à vis d'un appui primaire porté par le fond du couvercle.This mechanism comprises a cover, a pressure plate linked in rotation to the cover with axial mobility, clutch means bearing on the bottom, which the cover has a hollow shape, to urge the pressure plate in the direction opposite to the bottom of the cover and declutching means to counteract at will the action of declutching means. In these documents, the engagement and disengagement means belong to the same annular part called a diaphragm, pivotally mounted on the bottom of the cover by assembly means passing axially through enlarged orifices in the diaphragm. The assembly means, in the form of tabs or columns, carry, after crossing the diaphragm, a secondary support located opposite a primary support carried by the bottom of the cover.
Lorsque l'embrayage à friction est engagé - disque de friction serré entre les plateaux de pression et de réaction que comporte l'embrayage - le diaphragme sollicite le fond du couvercle en direction opposée du plateau de pression. Lors du désengagement de l'embrayage, le fond du couvercle est sollicité axialement dans l'autre sens.When the friction clutch is engaged - friction disc clamped between the pressure and reaction plates that the clutch comprises - the diaphragm biases the bottom of the cover in the opposite direction from the pressure plate. When disengaging the clutch, the bottom of the cover is biased axially in the other direction.
Il importe donc que le fond du couvercle bouge le moins possible afin d'avoir une course de débrayage minimum et une levée de plateau de pression suffisante pour libérer le disque de friction et désengager l'embrayage. Pour cette raison on a prévu dans le document US-A-3,630,333 de doter le fond du couvercle localement de nervures de raidissement d'orientation radiale. Ces nervures se terminent par une extrémité sinueuse qui nécessite la création d'un outillage spécial.It is therefore important that the bottom of the cover moves as little as possible in order to have a minimum disengaging stroke and a lifting of the pressure plate sufficient to release the friction disc and disengage the clutch. For this reason, provision has been made in document US-A-3,630,333 to provide the bottom of the cover locally with stiffening ribs of radial orientation. These ribs end in a sinuous end which requires the creation of special tools.
Il importe donc de modifier le moins possible l'outillage de fabrication du couvercle. La présente invention a pour objet de répondre de manière simple et économique à ce souhait tout en conservant les avantages de l'art antérieur..It is therefore important to modify the manufacturing tool for the cover as little as possible. The object of the present invention is to respond to this wish in a simple and economical manner while retaining the advantages of the prior art.
Suivant l'invention, le mécanisme d'embrayage est caractérisé en ce que les nervures ont une partie supérieure pointue . Grâce à l'invention, le fond du couvercle est plus raide et le rendement de l'embrayage est amélioré. Pour une même course de débrayage, on obtient donc une meilleure levée du plateau de pression et un meilleur désengagement de l'embrayage. En outre grâce à la partie supérieure pointue on diminue les contraintes et on peut bien emboutir le couvercle pour formation de la jupe externe du couvercle.According to the invention, the clutch mechanism is characterized in that the ribs have a pointed upper part. Thanks to the invention, the bottom of the cover is stiffer and the clutch efficiency is improved. For the same declutching stroke, a better lifting of the pressure plate is obtained and a better disengagement of the clutch. In addition, thanks to the pointed upper part, the stresses are reduced and the cover can well be stamped to form the outer skirt of the cover.
Ces nervures sont dirigées en direction opposées au plateau de réaction. Ceci est applicable à n'importe quel type de couvercle et conduit à réaliser les nervures dans le fond du couvercle, sans modification profonde de l'outillage de celui-ci. Les nervures radiales favorisent la diminution des contraintes et permettent de conserver une bonne géométrie de l'appui primaire. Les nervures sont moins larges que celles du document US-A-3,630,333.These ribs are directed in the opposite direction to the reaction plate. This is applicable to any type of cover and leads to producing the ribs in the bottom of the cover, without profound modification of the tooling. this one. The radial ribs favor the reduction of the stresses and allow to maintain a good geometry of the primary support. The ribs are narrower than those of document US-A-3,630,333.
Les nervures alternent circonférentiellement avec les moyens d'assemblage pour modifier encore le moins possible l'outillage de fabrication du couvercle.The ribs alternate circumferentially with the assembly means to modify the tooling for manufacturing the cover as little as possible.
En outre, cela permet de placer les nervures aux endroits les plus favorables pour raidir le couvercle.In addition, this allows the ribs to be placed in the most favorable places to stiffen the cover.
Le fond des nervures est radialement aligné avec une fente du diaphragme ou d'un faux diaphragme monté de manière pivotante sur le fond du couvercle à l'aide des moyens d'assemblage précités.The bottom of the ribs is radially aligned with a slot in the diaphragm or a false diaphragm pivotally mounted on the bottom of the cover using the aforementioned assembly means.
Ainsi, les nervures peuvent affecter les pattes radiales interne, que présente le couvercle dans certaines configurations, sans détruire la symétrie d'une telle patte s'étendant en saillie radiale vers l'intérieur, c'est-à-dire vers le centre du mécanisme. Toutes ces pattes ne sont pas forcément dotées de nervures.Thus, the ribs can affect the internal radial tabs, which the cover has in certain configurations, without destroying the symmetry of such a tab extending radially inward, that is to say towards the center of the mechanism. Not all of these legs have ribs.
Les nervures ont une partie supérieure pointue pour diminuer les contraintes et une partie principale de forme rectangulaire pour raidir au maximum le couvercle. La partie pointue permet de bien emboutir celui-ci pour formation de la jupe périphérique externe du couvercle, tout en conservant la partie périphérique du couvercle. Les nervures peuvent être plus nombreuses que celles du document US-A-The ribs have a pointed upper part to reduce stresses and a main rectangular part to stiffen the cover as much as possible. The pointed part allows it to be properly stamped to form the outer peripheral skirt of the cover, while retaining the peripheral part of the cover. The ribs may be more numerous than those of document US-A-
3,630,333. Elles peuvent être toutes identiques et autorisent la formation des moyens d'assemblage avec un plus grand nombre de pattes ou colonnettes, tout en conservant dans une forme de réalisation un appui primaire embouti.3,630,333. They can all be identical and allow the formation of assembly means with a greater number of lugs or columns, while retaining in one embodiment a pressed primary support.
Les nervures radiales sont reliées ensemble par une nervure annulaire de raccordement entourant l'appui primaire et permettant une bonne précision pour l'obtention de l'appui primaire, le plus souvent réalisé par emboutissage du fond.The radial ribs are connected together by an annular connection rib surrounding the primary support and allowing good precision for obtaining the primary support, most often produced by stamping the bottom.
Les nervures s'étendent en-dessous des languettes élastiques à action circonférentielle et ce , circonférentiellement à distance de celles-ci.The ribs extend below the elastic tongues with circumferential action and this, circumferentially at a distance from these.
La description qui va suivre illustre l'invention en regard des dessins annexés dans lesquels :The description which follows illustrates the invention with reference to the appended drawings in which:
- La figure 1 est une vue partielle de face du mécanisme d'embrayage unitaire selon l'invention ; les figures 2 et 3 sont des demi-vues en coupe selon respectivement les lignes 2-2 et 3-3 de la figure 1 ; - la figure 4 est une vue analogue à la figure 3 pour un autre exemple de réalisation.- Figure 1 is a partial front view of the unitary clutch mechanism according to the invention; Figures 2 and 3 are half-sectional views along lines 2-2 and 3-3 respectively of Figure 1; - Figure 4 is a view similar to Figure 3 for another embodiment.
Dans ces figures est représenté un mécanisme d'embrayage formant un ensemble unitaire destiné à être rapporté sur le plateau de réaction d'un embrayage après interposition d'un disque de friction, comme visible par exemple dans le document FR-86983 auquel on pourra se reporter pour plus de précisions. Ainsi qu'on le sait, dans un véhicule automobile, le plateau de réaction est lié en rotation au vilebrequin du moteur à combustion interne, formant arbre menant, tandis que le disque de friction comporte un moyeu cannelé intérieurement pour sa liaison en rotation à l'arbre d'entrée de la boîte de vitesses, formant arbre mené. Le plateau de réaction peut être fixé directement sur le vilebrequin ou appartenir à un double volant amortisseur de torsion, plus précisément appartenir à la deuxième masse d'un double volant amortisseur monté de manière rotative, par l'intermédiaire de moyens de palier, sur le moyeu central d'une première masse solidaire du vilebrequin. En variante, le plateau de réaction est solidaire d'un disque flexible axialement fixé sur le vilebrequin.In these figures is shown a clutch mechanism forming a unitary assembly intended to be attached to the reaction plate of a clutch after interposition of a friction disc, as visible for example in document FR-86983 to which we can see more details. As is known, in a motor vehicle, the reaction plate is linked in rotation to the crankshaft of the internal combustion engine, forming a driving shaft, while the friction disc has an internally grooved hub for its connection in rotation to the input shaft of the gearbox, forming a driven shaft. The reaction plate can be fixed directly on the crankshaft or belong to a double torsional damping flywheel, more precisely belong to the second mass of a double damping flywheel mounted in a rotary manner, by means of bearings, on the central hub of a first mass secured to the crankshaft. Alternatively, the reaction plate is secured to a flexible disc axially fixed to the crankshaft.
Le disque de friction comporte à sa périphérie externe deux faces de friction pour contact avec des faces de friction, que présentent respectivement dorsalement le plateau de réaction et frontalement un plateau de pression 1 appartenant au mécanisme d'embrayage. Les faces de friction appartiennent à au moins une garniture de friction solidaire d'au moins un disque de support accouplé de manière rigide ou élastique au moyeu du disque de friction.The friction disc has at its outer periphery two friction faces for contact with friction faces, which respectively have the reaction plate dorsally and frontally a pressure plate 1 belonging to the clutch mechanism. The friction faces belong to at least one friction lining integral with at least one support disc rigidly or resiliently coupled to the hub of the friction disc.
Lorsque l'embrayage est engagé, la ou les garniture(s) de friction sont libérées et le couple n'est plus transmis à l'arbre mené. Pour ce faire, le mécanisme d'embrayage comporte des moyens embrayeurs 2 et des moyens debrayeurs 3 pour contrecarrer à volonté l'action des moyens embrayeurs 2, tels qu'une rondelle Belleville.When the clutch is engaged, the friction lining (s) are released and the torque is no longer transmitted to the driven shaft. To do this, the clutch mechanism comprises engaging means 2 and declutching means 3 to counteract at will the action of the engaging means 2, such as a Belleville washer.
Les moyens debrayeurs comportent des leviers de débrayage, tels que les doigts 3 d'un diaphragme 4 sur l'extrémité interne desquels agit une butée de débrayage commandée mécaniquement, hydrauliquement et/ou électriquement.The declutching means comprise declutching levers, such as the fingers 3 of a diaphragm 4 on the internal end of which acts a declutching stop controlled mechanically, hydraulically and / or electrically.
Usuellement, les moyens embrayeurs 2 et debrayeurs 3 appartiennent à une même pièce 4 appelée diaphragme, de forme tronconique à l'état libre et globalement plane lorsque le mécanisme d'embrayage est monté sur le plateau de réaction, le disque de friction étant neuf. Lorsque l'embrayage est du type poussé, le diaphragme 4 est monté de manière basculante ou pivotante sur un couvercle 5 destiné à être fixé au plateau de réaction. En agissant en poussant à l'aide de la butée de débrayage sur l'extrémité interne des doigts 3 du diaphragme 4 on fait basculer celui-ci pour annuler la charge qu'il exerce sue le plateau de pression 1 pour libérer la ou les garniture(s) de friction du disque de friction.Usually, the engaging means 2 and declutching means 3 belong to the same part 4 called a diaphragm, of frustoconical shape in the free state and generally planar when the clutch mechanism is mounted on the reaction plate, the friction disc being new. When the clutch is of the pushed type, the diaphragm 4 is pivotally or pivotally mounted on a cover 5 intended to be fixed to the reaction plate. By acting by pushing with the clutch release bearing on the internal end of the fingers 3 of the diaphragm 4, the latter is tilted to cancel the load it exerts on the pressure plate 1 to release the lining (s) (s) of friction of the friction disc.
Plus précisément, dans les figures, le mécanisme d'embrayage comporte des pièces de forme annulaire, à savoir un couvercle 5, un plateau de pression 1 , et un diaphragme 4.More specifically, in the figures, the clutch mechanism comprises parts of annular shape, namely a cover 5, a pressure plate 1, and a diaphragm 4.
Le couvercle 5, de forme creuse, comporte un fond 51 , globalement d'orientation transversale, prolongé à sa périphérie externe par une jupe 52 annulaire, globalement d'orientation axiale, prolongée à son extrémité libre par un rebord 53 d'orientation transversale dirigée radialement vers l'extérieur.The cover 5, of hollow form, has a bottom 51, generally of transverse orientation, extended at its outer periphery by an annular skirt 52, generally of axial orientation, extended at its free end by a rim 53 of transverse orientation directed radially outwards.
Le rebord 53 est doté de trous 54 pour le passage d'organes de fixation, usuellement des vis, pour fixation du couvercle 5 au plateau de réaction ou à une pièce solidaire de celui-ci, tel que le disque.The rim 53 is provided with holes 54 for the passage of fixing members, usually screws, for fixing the cover 5 to the reaction plate or to a part integral with it, such as the disc.
Les têtes des vis de fixation prennent appui sur le rebord 53, qui est ainsi un rebord de fixation.The heads of the fixing screws bear on the flange 53, which is thus a fixing flange.
C'est donc par l'intermédiaire du couvercle 5 que le mécanisme d'embrayage est rapporté de manière unitaire sur le plateau de réaction, soit de manière directe, soit de manière indirecte.It is therefore via the cover 5 that the clutch mechanism is attached in a unitary manner to the reaction plate, either directly or indirectly.
Le plateau de pression 1 présente frontalement une face de friction 11 pour, de manière précitée, coopérer à frottement avec le disque de friction.The pressure plate 1 has a friction face 11 frontally in order to, in the aforementioned manner, co-operate with friction with the friction disc.
Dorsalement, ce plateau présente, en saillie axiale en direction du fond 51 du couvercle, un appui tertiaire 12 sous forme d'un bossage annulaire fractionné en segment d'appui à extrémité pointue pour contact local avec la périphérie externe du diaphragme 4. La périphérie externe du diaphragme 4 consiste en une rondelle Belleville 2 de forme tronconique à l'état libre et constituant les moyens embrayeurs à action axiale. Cette rondelle Belleville est prolongée par une partie centrale fragmentée en doigt 3 radiaux par des fentes 41 borgnes. Les doigts 3 constituent les moyens embrayeurs de l'embrayage.Dorsally, this plate has, in axial projection towards the bottom 51 of the cover, a tertiary support 12 in the form of an annular boss split into a support segment with a pointed end for local contact with the external periphery of the diaphragm 4. The periphery external of the diaphragm 4 consists of a Belleville washer 2 of frustoconical shape in the free state and constituting the engagement means with axial action. This Belleville washer is extended by a central part fragmented into a 3 radial finger by blind 41 slots. The fingers 3 constitute the clutch engagement means.
Ces doigts 3 forment des leviers de débrayage, les fentes 41 débouchant dans l'ouverture centrale du diaphragme. A leur périphérie externe, les fentes débouchent dans des orifices élargis 42 formant le fond des fentes 41. Les orifices 42 sont implanté la périphérie interne de la rondelle Belleville 2 et sont destinés à être traversés axialement par des moyens d'assemblage 6 assujettissant de manière pivotante le diaphragme 4 au couvercle 5.These fingers 3 form release levers, the slots 41 opening into the central opening of the diaphragm. At their external periphery, the slots open into enlarged orifices 42 forming the bottom of the slots 41. The orifices 42 are located on the internal periphery of the Belleville washer 2 and are intended to be traversed axially by assembly means 6 so as to subject swivel the diaphragm 4 to the cover 5.
Les moyens d'assemblage 6 portent, après traversée axiale du diaphragme 4, un appui secondaire 7 en regard d'un appui primaire 8 porté en vis à vis par le couvercle 5, plus précisément par le fond 51 de celui-ci. Ici, les moyens d'assemblage 6 consistent en des pattes d'assemblage 6 issues par découpe et pliage du fond 51 du couvercle 5 métallique, ici en tôle emboutie. Les pattes d'assemblage 6 traversent axialement les orifices 42 et ont une extrémité libre repliée radialement vers l'extérieur en direction de la périphérie externe du plateau de réaction 1 , pour formation d'un coude de calage pour une couronne jonc 70 de forme tronconique comme décrit dans le documentThe assembly means 6 carry, after axial passage of the diaphragm 4, a secondary support 7 opposite a primary support 8 carried opposite by the cover 5, more precisely by the bottom 51 thereof. Here, the assembly means 6 consist of assembly tabs 6 produced by cutting and folding the bottom 51 of the metal cover 5, here in stamped sheet metal. The assembly tabs 6 pass axially through the orifices 42 and have a free end folded radially outwards in the direction of the external periphery of the reaction plate 1, to form a wedging elbow for a ring crown 70 of frustoconical shape as described in the document
FR-A-2 585 424 auquel on se reportera pour plus de précisions. La couronne 70 présente une arête externe arrondie pour formation de l'appui secondaire 7 disposé en regard de l'appui primaire 8 du couvercle formé par emboutissage du fond 51. Le diaphragme 4 est donc pincé de manière élastique au niveau de la périphérie interne de sa rondelle Belleville 2 entre les appuis 7 et 8 implantés radialement en dessous de l'appui tertiaire 12 du plateau de pression 1. Lorsque l'embrayage est engagé, le diaphragme 4 prend appui sur l'appui primaire 8 et l'appui tertiaire 12, pour solliciter le plateau de pression 1 en direction opposée au fond 51 du couvercle 5 pour serrer le disque de friction entre les plateaux de pression et de réaction. Lorsque la butée de débrayage agit en poussant sur les extrémités, ici élargies, des doigts 3 du diaphragme 4, celui-ci prend appui sur l'appui secondaire 7 et pivote. Des languettes élastiques 13 à action axiale rappellent le plateau de pression 1 en direction du fond 51 du couvercle afin de libérer le disque de friction lors de la fin de l'opération de débrayage.FR-A-2 585 424 to which reference will be made for further details. The crown 70 has a rounded external edge for forming the secondary support 7 disposed opposite the primary support 8 of the cover formed by stamping the bottom 51. The diaphragm 4 is therefore pinched elastically at the internal periphery of its Belleville washer 2 between the supports 7 and 8 located radially below the tertiary support 12 of the pressure plate 1. When the clutch is engaged, the diaphragm 4 is supported on the primary support 8 and the tertiary support 12, to urge the pressure plate 1 in the direction opposite to the bottom 51 of the cover 5 to tighten the friction disc between the plates pressure and reaction. When the clutch release bearing acts by pushing on the ends, here enlarged, of the fingers 3 of the diaphragm 4, the latter bears on the secondary support 7 and pivots. Elastic tongues 13 with axial action remind the pressure plate 1 in the direction of the bottom 51 of the cover in order to release the friction disc at the end of the declutching operation.
Les languettes 13 sont ici d'orientation tangentielle. Trois jeux des languettes 13, éventuellement superposées, sont prévus. Les languettes 13 sont fixées ici par rivetage à l'une de leur extrémité au rebord 53 du couvercle, présentant les plages décalées axialement en direction du fond 51 à cet effet, et à leur autre extrémité à des pattes 14 que présente le plateau de pression 1 en saillie radiale à cet effet. En variante, comme décrit dans le document FR-86 983, les moyens d'assemblage consistent en des colonnettes épaulées portant deux joncs annulaires disposés de part et d'autre de la périphérie interne de la rondelle Belleville 2 du diaphragme, forant les appuis primaires et secondaires. En variante, l'appui secondaire est formé per les têtes des colonnettes 60 profilées en arc de cercle à cet effet et fixées au fond 51 du couvercle 5 comme visible à la figure 4.The tongues 13 are here of tangential orientation. Three sets of tabs 13, possibly superimposed, are provided. The tongues 13 are fixed here by riveting at one of their ends to the rim 53 of the cover, having the areas offset axially in the direction of the bottom 51 for this purpose, and at their other end to lugs 14 which have the pressure plate 1 radially projecting therefor. As a variant, as described in document FR-86 983, the assembly means consist of shouldered posts carrying two annular rods arranged on either side of the internal periphery of the Belleville washer 2 of the diaphragm, drilling the primary supports and secondary. As a variant, the secondary support is formed by the heads of the columns 60 profiled in an arc for this purpose and fixed to the bottom 51 of the cover 5 as visible in FIG. 4.
Bien entendu, les moyens embrayeurs, outre le diaphragme, peuvent comporter une rondelle Belleville d'assistance montée en série ou en parallèle avec le diaphragme.Of course, the engagement means, in addition to the diaphragm, may include a Belleville assistance washer mounted in series or in parallel with the diaphragm.
En variante, le diaphragme est remplacé par un faux diaphragme , c'est-à- dire une pièce ayant la configuration d'un diaphragme - partie périphérique continue prolongée radialement vers l'intérieur par une partie centrale fragmentée en doigts radiaux par des fentes, dont les orifices élargis sont traversés par des moyens d'assemblage 6- mais, la partie périphérique de cette pièce est dépourvue d'élasticité axiale ou présente une faible élasticité axiale, grâce par exemple à des fentes borgnes d'orientation radiale réalisées dans ces parties périphérie et débouchant à la périphérie externe de celle-ci.As a variant, the diaphragm is replaced by a false diaphragm, that is to say a part having the configuration of a diaphragm - continuous peripheral part extended radially inwards by a central part fragmented into radial fingers by slots, whose enlarged orifices are crossed by means of assembly 6- but, the peripheral part of this part is devoid of axial elasticity or has a low axial elasticity, thanks for example to blind slots of radial orientation produced in these parts periphery and opening onto the external periphery thereof.
Dans ce cas, les moyens embrayeurs consistent en une rondelle Belleville prenant appui sur le couvercle pour action sur la partie périphérique du faux diaphragme en appui sur l'appui tertiaire 12. Quoi qu'il en soit, le fond 51 du couvercle est déformé très faiblement axialement dans un sens lorsque l'embrayage est engagé sous l'action exercée par les moyens embrayeurs 2 et dans l'autre sens lors de l'opération de débrayage.In this case, the engagement means consist of a Belleville washer bearing on the cover for action on the peripheral part of the false diaphragm bearing on the tertiary support 12. Anyway, the bottom 51 of the cover is very deformed slightly axially in one direction when the clutch is engaged under the action exerted by the engagement means 2 and in the other direction during the declutching operation.
C'est donc un but de l'invention de raidir le couvercle sans modifier celui-ci de manière profonde notamment sans modifier sa partie périphérique externe. Ainsi le fond 51 est doté localement de nervures de raidissement 9. Ces nervures 9 sont d'orientation radiale et alternent ciconférentiellement avec les moyens d'assemblage 6.It is therefore an object of the invention to stiffen the cover without modifying it in particular, in particular without modifying its external peripheral part. Thus the bottom 51 is locally provided with stiffening ribs 9. These ribs 9 are of radial orientation and alternate cone to the assembly means 6.
L'appui primaire 8 est interrompue par les nervures 9 dont l'orientation radiale permet de conserver une bonne géométrie de l'appui primaire 8.The primary support 8 is interrupted by the ribs 9 whose radial orientation makes it possible to maintain good geometry of the primary support 8.
Ici le fond 51 est dentelé à sa périphérie interne.Here the bottom 51 is serrated at its internal periphery.
Ce fond présente des pattes 55, de forme trapézoïdale, d'orientation radiale, dirigées vers le centre du mécanisme d'embrayage. Les pattes 55 alternent circonférentiellement avec les pattes d'assemblage 6 et ont une forme trapézoïdale. Les pattes 55 sont plus larges circonférentiellement que les pattes d'assemblage 6, sont en vis-à-vis chacune de deux doigts 3 et s'étendent radialement vers l'intérieur, en saillie radiale, par rapport aux pattes d'assemblage 6.This bottom has tabs 55, of trapezoidal shape, of radial orientation, directed towards the center of the clutch mechanism. The legs 55 alternate circumferentially with the assembly legs 6 and have a trapezoidal shape. The lugs 55 are wider circumferentially than the assembly lugs 6, each face two fingers 3 and extend radially inwards, radially projecting, relative to the assembly lugs 6.
Les nervures 9 selon l'invention affectent centralement les pattes 55 sur leur hauteur et s'étendent radialement au-dessus de celles-ci. Les nervures 9 sont chacune dans l'alignement d'une fente 41.The ribs 9 according to the invention affect the legs 55 centrally over their height and extend radially above these. The ribs 9 are each in alignment with a slot 41.
Plus précisément le fond 90 des nervures 9, dirigées ici en direction opposée au plateau de pression 1 , a globalement la même largeur que la partie supérieure d'une fente 41. Ici le fond 90 est un peu plus large qu'une fente 41.More precisely, the bottom 90 of the ribs 9, directed here in the direction opposite to the pressure plate 1, has generally the same width as the upper part of a slot 41. Here the bottom 90 is a little wider than a slot 41.
La partie supérieure 91 de la nervure a suivant l'invention une forme pointue et se raccorde à la partie principale 92 de la nervure 9 globalement de forme rectangulaire. Les nervures interrompent ici l'appui primaire 8 et facilitent l'évacuation de l'huile lors de la réalisation de l'appui primaire 8 et des nervures 9 à la presse.The upper part 91 of the rib according to the invention has a pointed shape and is connected to the main part 92 of the rib 9 generally of rectangular shape. The ribs here interrupt the primary support 8 and facilitate the evacuation of the oil during the production of the primary support 8 and the ribs 9 with the press.
La base de la partie supérieure 91 s'étend au-dessus de l'appui primaire 8.The base of the upper part 91 extends above the primary support 8.
Ainsi la nervure a une forme pointue radialement au-dessus de l'appui primaire 8 et a une forme rectangulaire en dessous.Thus the rib has a pointed shape radially above the primary support 8 and has a rectangular shape below.
La base de la partie supérieure pointue se raccorde à une nervure annulaire de raccordement 93 reliant entre elles les nervures radiales 9.The base of the pointed upper part is connected to an annular connection rib 93 connecting the radial ribs 9 to one another.
La nervure 93 entoure l'appui primaire 8 et est dirigée axialement en sens inverse par rapport à celle-ci, c'est-à-dire comme les nervures 9 en direction opposée au plateau de pression 1.The rib 93 surrounds the primary support 8 and is directed axially in the opposite direction with respect to the latter, that is to say like the ribs 9 in the direction opposite to the pressure plate 1.
La nervure 93 permet une bonne évacuation de l'huile en combinaison avec les nervures 9. Cela permet d'obtenir une très bonne géométrie de l'appui primaire 8.The rib 93 allows good evacuation of the oil in combination with the ribs 9. This makes it possible to obtain a very good geometry of the primary support 8.
Le fond 51 est rigidifié de manière simple et économique sans modification profonde de l'outillage puisque les pattes 55,6 sont conservées ainsi que la partie périphérique 52,53 du couvercle. Seul le fond 51 est affecté par les nervures 9,93. Les pointes des nervures 9 permettent l'obtention aisée de la jupe 52 et du rebord 53 par emboutissage du couvercle en tôle.The bottom 51 is rigidified in a simple and economical manner without major modification of the tool since the tabs 55, 6 are preserved as well as the peripheral part 52, 53 of the cover. Only the bottom 51 is affected by the ribs 9.93. The tips of the ribs 9 make it easy to obtain the skirt 52 and the rim 53 by stamping the sheet metal cover.
Bien entendu, en variante figure 4, la périphérie interne du fond 51 peut être continue, les nervures 9 alternant avec les moyens d'assemblage 6 comme dans les figures. Grâce à l'invention on peut utiliser une rondelle d'assistance agissant en parallèle avec le diaphragme comme décrit dans le document FR-A-2 728 637 grâce au raidissement du couvercle.Of course, as a variant in FIG. 4, the internal periphery of the bottom 51 can be continuous, the ribs 9 alternating with the assembly means 6 as in the figures. Thanks to the invention, it is possible to use an assistance washer acting in parallel with the diaphragm as described in document FR-A-2 728 637 thanks to the stiffening of the cover.
La rondelle d'assistance prend alors appui, d'une part, sur le fond 51 du couvercle au niveau des colonnettes et, d'autre part, sur l'extrémité interne des doigts du diaphragme.The assistance washer then bears, on the one hand, on the bottom 51 of the cover at the level of the columns and, on the other hand, on the internal end of the fingers of the diaphragm.
Bien entendu, comme décrit dans ce document, l'appui tertiaire 12 peut appartenir à un dispositif de rattrapage d'usure pour compenser l'usure de la ou des garnitures de frottement du disque de friction, qui est usuellement doté d'une progressivité élastique entre ses garnitures de friction.Of course, as described in this document, the tertiary support 12 can belong to a wear take-up device to compensate for the wear of the friction lining (s) of the friction disc, which is usually provided with elastic progressiveness. between its friction linings.
L'appui 12 peut donc appartenir à un anneau doté de rampes coopérant avec des contre-rampes portées dorsalement par le plateau de pression pour maintenir le diaphragme dans la même position lorsque l'embrayage est engagé et ce durant toute la durée de vis de l'embrayage. Les nervures 9 s'étendent ici dans un plan transversal, mais en variante, peuvent être inclinées par rapport à un plan transversal.The support 12 can therefore belong to a ring provided with ramps cooperating with counter-ramps carried dorsally by the pressure plate to maintain the diaphragm in the same position when the clutch is engaged and for the entire duration of the screw. 'clutch. The ribs 9 extend here in a transverse plane, but as a variant, can be inclined relative to a transverse plane.
Le plateau de pression 1 est lié en rotation au couvercle 5 avec mobilité axiale grâce aux languettes 13. En variante on peut utiliser une liaison du type tenons- mortaises des pattes radiales, du plateau 1 , formant tenons, pénétrant de manière complémentaire dans des rainures axiales, formant mortaises, réalisées dans la jupe 52 du couvercle.The pressure plate 1 is linked in rotation to the cover 5 with axial mobility by means of the tongues 13. As a variant, it is possible to use a connection of the tenon-mortise type of the radial lugs, of the plate 1, forming tenons, penetrating in a complementary manner in grooves axial, forming mortises, made in the skirt 52 of the cover.
Ce couvercle peut être assemblé par sertissage au plateau de réaction ou par soudage à un disque solidaire du plateau de réaction et fixé sur le vilebrequin.This cover can be assembled by crimping to the reaction plate or by welding to a disc secured to the reaction plate and fixed to the crankshaft.
Le couvercle 5 est donc fixé de manière amovible ou non amovible sur le plateau de réaction.The cover 5 is therefore fixed in a removable or non-removable manner on the reaction plate.
Le mécanisme d'embrayage peut donc appartenir à un module unitaire comportant le plateau de réaction. Les pattes 55 sont raidies avantageusement et servent d'appui au diaphragme lorsque le mécanisme d'embrayage est en position de stockage - mécanisme non monté sur le plateau de réaction - pour protéger les languettes 13. Les pattes 55 sont donc des pattes de retenue.The clutch mechanism can therefore belong to a unitary module comprising the reaction plate. The legs 55 are advantageously stiffened and serve as a support for the diaphragm when the clutch mechanism is in the storage position - mechanism not mounted on the reaction plate - to protect the tabs 13. The legs 55 are therefore retaining lugs.
Bien entendu le nombre de moyens d'assemblage 6 est inférieur au nombre d'orifices élargis 42. Les moyens debrayeurs 3 sont montés de manière pivotante entre les appuis primaire 7 et secondaire 8 de forme annulaire, éventuellement fractionnés. Bien entendu dans le cas où le mécanisme est doté d'un dispositif de rattrapage d'usure l'anneau à rampes portant l'appui tertiaire 12 du diaphragme peut présenter à sa périphérie externe une denture propre à être entraînée en cas d'usure par une vis sans fin portée par le couvercle et soumise à l'action d'un ressort actionné par une roue à rochet, elle-même soumise à l'action d'une languette de commande manoeuvrée par un appendice du diaphragme en cas d'usure. De préférence les nervures 9 sont réparties de manière régulière. Ici toutes les pattes 55 sont dotées de nervures 9 dirigées axialement en direction opposée au plateau de pression 1. En variante certaines pattes 55 sont dotées de nervures 9.Of course, the number of assembly means 6 is less than the number of enlarged orifices 42. The declutching means 3 are pivotally mounted between the primary 7 and secondary 8 supports of annular shape, possibly split. Of course, in the case where the mechanism is provided with a wear take-up device, the ramp ring carrying the tertiary support 12 of the diaphragm may have at its outer periphery a toothing suitable for being driven in the event of wear by a worm screw carried by the cover and subjected to the action of a spring actuated by a ratchet wheel, itself subjected to the action of a control tongue operated by an appendage to the diaphragm in the event of wear . Preferably the ribs 9 are distributed evenly. Here all the tabs 55 are provided with ribs 9 directed axially in the direction opposite to the pressure plate 1. As a variant, certain tabs 55 are provided with ribs 9.
La forme des nervures 9 est bien adaptée à la forme des pattes 55 trapézoïdales. Les contraintes sont ramenées vers l'axe de symétrie radial des pattes 55 grâce aux nervures. La nervure 93 permet de bien conserver la géométrie des pattes 55.The shape of the ribs 9 is well suited to the shape of the trapezoidal legs 55. The stresses are brought back towards the axis of radial symmetry of the legs 55 thanks to the ribs. The rib 93 makes it possible to conserve the geometry of the legs 55 well.
En variante, lorsque le mécanisme est doté d'un dispositif de rattrapage d'usure, on peut interposer une cale entre les doigts du diaphragme et les pattes 55 pour protéger le dispositif de rattrapage d'usure lorsque le mécanisme est en position de stockage. La cale comporte des pattes saillantes radialement montées par un montage baïonnette sous les pattes 55, les pattes saillantes étant introduites dans les echancrures délimitées par deux pattes 55, puis montées sous les pattes 55 par rotation. Après montage du montage du mécanisme sur le plateau de réaction, on enlève la cale. Le raidissement des pattes 55 est favorable pour l'insertion de la cale.Alternatively, when the mechanism is provided with a wear take-up device, a shim can be interposed between the fingers of the diaphragm and the tabs 55 to protect the wear take-up device when the mechanism is in the storage position. The wedge has projecting tabs radially mounted by a bayonet mounting under the tabs 55, the projecting tabs being introduced into the notches delimited by two tabs 55, then mounted under the tabs 55 by rotation. After mounting the assembly of the mechanism on the reaction plate, the shim is removed. The stiffening of the legs 55 is favorable for the insertion of the wedge.
Le couvercle 5 peut être plus profond The cover 5 can be deeper

Claims

REVENDICATIONS
1- Mécanisme d'embrayage pour embrayage à friction, en particulier de véhicule automobile, comportant un couvercle (5) de forme creuse avec un fond (51 ) troué centralement et d'orientation globalement transversale, un plateau de pression (1) lié en rotation au couvercle (1) avec mobilité axiale par rapport à celui-ci, des moyens embrayeurs (2) prenant appui sur le fond (51 ) du couvercle (5) pour solliciter le plateau de pression (1) en direction opposée au fond (51) du couvercle (5) et des moyens debrayeurs ( (3) pour contrecarrer à volonté l'action des moyens embrayeurs (2), dans lequel le fond (51) du couvercle (5) est doté localement de nervures de raidissement (9) d'orientation radiale caractérisé en ce que les nervures (9) ont une partie supérieure (91 ) de forme pointue.1- Clutch mechanism for a friction clutch, in particular for a motor vehicle, comprising a cover (5) of hollow shape with a bottom (51) perforated centrally and of generally transverse orientation, a pressure plate (1) linked in rotation with the cover (1) with axial mobility with respect thereto, engagement means (2) bearing on the bottom (51) of the cover (5) to urge the pressure plate (1) in the direction opposite to the bottom ( 51) of the cover (5) and declutching means ((3) to counteract at will the action of the clutch means (2), in which the bottom (51) of the cover (5) is locally provided with stiffening ribs (9 ) of radial orientation characterized in that the ribs (9) have an upper part (91) of pointed shape.
2- Mécanisme selon la revendication 1 , caractérisé en ce que la partie principale (92) de la nervure (9) est de forme rectangulaire. 3- Mécanisme selon l'une quelconque des revendications 1 et 2, dans lequel les moyens debrayeurs (3) comportent des doigts radiaux (3) séparés deux à deux par des fentes borgnes (41) avec des fonds, qui constituent des orifices élargis (42), dont certains sont traversés par des moyens d'assemblage (6,60) portant un appui secondaire (7) en regard d'un appui primaire (8) porté par le couvercle (5) pour montage pivotant des moyens debrayeurs (3) entre les appuis primaire (8) et secondaire (7), caractérisé en ce que les nervures (9) alternent circonférentiellement avec les moyens d'assemblage (6,60) et sont réparties circonférentiellement de manière régulière.2- Mechanism according to claim 1, characterized in that the main part (92) of the rib (9) is rectangular. 3- Mechanism according to any one of claims 1 and 2, wherein the declutching means (3) comprise radial fingers (3) separated in pairs by blind slots (41) with bottoms, which constitute enlarged orifices ( 42), some of which are crossed by assembly means (6,60) carrying a secondary support (7) opposite a primary support (8) carried by the cover (5) for pivoting mounting of the declutching means (3 ) between the primary (8) and secondary (7) supports, characterized in that the ribs (9) alternate circumferentially with the assembly means (6,60) and are distributed circumferentially in a regular manner.
4- Mécanisme selon la revendication 3, caractérisé en ce que la partie supérieure (91 ) des nervures (9) s'étend radialement au-dessus de l'appui primaire (8).4- Mechanism according to claim 3, characterized in that the upper part (91) of the ribs (9) extends radially above the primary support (8).
5- Mécanisme selon la revendication 3 ou 4, caractérisé en ce que les nervures (9) sont reliées entre elles par une nervure annulaire de raccordement (93) entourant l'appui primaire (8).5- Mechanism according to claim 3 or 4, characterized in that the ribs (9) are interconnected by an annular connection rib (93) surrounding the primary support (8).
6- Mécanisme selon l'une quelconque des revendications 3 à 5, caractérisé en ce que les nervures (9) ont un fond (90) s'étendant radialement dans le prolongement d'une fente (41) séparant deux à deux les doigts des moyens debrayeurs (3).6- Mechanism according to any one of claims 3 to 5, characterized in that the ribs (9) have a bottom (90) extending radially in the extension of a slot (41) separating two by two the fingers of the declutching means (3).
7- Mécanisme selon la revendication 6, dans lequel les moyens d'assemblage (6) consistent en des pattes d'assemblage issues du fond (51) du couvercle (5), lesdites pattes (6) alternant circonférentiellement avec des pattes radiales (55) de forme trapézoïdale, que présente le fond (51 ) à sa périphérie interne, caractérisé en ce que les nervures (9) affectent centralement au moins certaines pattes radiales.7- Mechanism according to claim 6, wherein the assembly means (6) consist of assembly tabs from the bottom (51) of the cover (5), said tabs (6) alternating circumferentially with radial tabs (55 ) of trapezoidal shape, which has the bottom (51) at its internal periphery, characterized in that the ribs (9) affect centrally at least some radial lugs.
8- Mécanisme d'embrayage selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les moyens debrayeurs (3) et embrayeurs (2) appartiennent à un diaphragme (4) doté d'orifices élargis (42) et monté de manière pivotante sur le fond (51) du couvercle (5) à l'aide de moyens d'assemblage (6,60) traversant les orifices élargis (42) du diaphragme et portant un appui secondaire (7) en regard d'un appui primaire (8) porté par le fond du couvercle pour montage pivotant du diaphragme (4) entre les appuis primaire (8) et secondaire (7). 9- Mécanisme selon la revendication 8, caractérisé en ce qu'il est équipé d'un dispositif de rattrapage d'usure comportant un anneau à rampes servant d'appui tertiaire au diaphragme radialement au-delà des appuis primaire (8) et secondaire (7).8- clutch mechanism according to any one of claims 1 to 7, characterized in that the declutching means (3) and clutch (2) belong to a diaphragm (4) with enlarged orifices (42) and mounted swivel on the bottom (51) of the cover (5) using assembly means (6,60) passing through the enlarged orifices (42) of the diaphragm and carrying a secondary support (7) opposite a primary support (8) carried by the bottom of the cover for pivoting mounting of the diaphragm (4) between the primary (8) and secondary (7) supports. 9- Mechanism according to claim 8, characterized in that it is equipped with a wear take-up device comprising a ring with ramps serving as tertiary support for the diaphragm radially beyond the primary (8) and secondary supports ( 7).
10- Mécanisme selon la revendication 8 ou 9, caractérisé en ce qu'une rondelle élastique d'assistance prend appui sur le fond (51) du couvercle (5) et sur la périphérie interne du diaphragme.10- Mechanism according to claim 8 or 9, characterized in that an elastic assistance washer is supported on the bottom (51) of the cover (5) and on the internal periphery of the diaphragm.
11- Mécanisme selon l'une quelconque des revendications 1 à 10, caractérisé en ce que les nervures (9) sont réparties circonférentiellement de manière régulière. 11- Mechanism according to any one of claims 1 to 10, characterized in that the ribs (9) are distributed circumferentially in a regular manner.
PCT/FR1999/001500 1998-06-26 1999-06-23 Clutch mechanism, for friction clutch WO2000000754A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19981400T DE19981400B4 (en) 1998-06-26 1999-06-23 Clutch mechanism for a friction clutch

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR98/08123 1998-06-26
FR9808123A FR2780462B1 (en) 1998-06-26 1998-06-26 CLUTCH MECHANISM FOR FRICTION CLUTCH

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WO2000000754A1 true WO2000000754A1 (en) 2000-01-06

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Application Number Title Priority Date Filing Date
PCT/FR1999/001500 WO2000000754A1 (en) 1998-06-26 1999-06-23 Clutch mechanism, for friction clutch

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DE (1) DE19981400B4 (en)
FR (1) FR2780462B1 (en)
WO (1) WO2000000754A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2878920B1 (en) 2004-12-06 2007-01-12 Valeo Embrayages CLUTCH, IN PARTICULAR FOR A MOTOR VEHICLE, OF A TYPE COMPRISING A MECHANISM COMPRISING AN IMPROVED COVER

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3630333A (en) * 1970-01-02 1971-12-28 Schiefer Mfg Co Clutch with diaphragm and clip springs for parallel
FR2653841A1 (en) * 1989-10-27 1991-05-03 Valeo Clutch mechanism particularly for a motor vehicle
FR2728637A1 (en) * 1994-12-24 1996-06-28 Fichtel & Sachs Ag AUXILIARY SPRING FRICTION CLUTCH INTENDED TO ASSIST THE RELEASE FORCE

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR86983E (en) * 1966-07-13
DE8509179U1 (en) * 1985-03-27 1985-06-27 Fichtel & Sachs Ag, 8720 Schweinfurt Coupling housing made of thin sheet metal
FR2585424B1 (en) * 1985-07-29 1989-12-29 Valeo DIAPHRAGM CLUTCH MECHANISM, ESPECIALLY FOR A MOTOR VEHICLE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3630333A (en) * 1970-01-02 1971-12-28 Schiefer Mfg Co Clutch with diaphragm and clip springs for parallel
FR2653841A1 (en) * 1989-10-27 1991-05-03 Valeo Clutch mechanism particularly for a motor vehicle
FR2728637A1 (en) * 1994-12-24 1996-06-28 Fichtel & Sachs Ag AUXILIARY SPRING FRICTION CLUTCH INTENDED TO ASSIST THE RELEASE FORCE

Also Published As

Publication number Publication date
DE19981400T1 (en) 2000-10-26
DE19981400B4 (en) 2008-01-10
FR2780462A1 (en) 1999-12-31
FR2780462B1 (en) 2000-08-18

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