FR3008459A1 - CLUTCH-CLUTCH FASTENING DEVICE AND MOTOR VEHICLE EQUIPPED WITH SUCH A FASTENING - Google Patents

Abstract

The invention relates to a device (1) with clutch release clutch of a motor vehicle comprising a bearing (4) forming a transmission member of an axial force (F1), with a rotating ring (42) and a non-rotating ring. (41) between which is defined a rolling chamber (43) for rolling elements (44). The device also comprises an actuating member (3) in contact with a substantially radial surface (32a) with the rotating ring (42). At least one element between the rotating ring (42) or the actuating member (3) is provided with at least one projecting relief (33; 429; 425) created by localized plastic deformation of said element (3; 42). . Said relief (33; 429; 425) cooperates with a retaining means (424; 37; 35) of the other member (42; 3) so as to prevent relative rotation between the rotating ring (42) and the body actuator (3).

Description

The present invention relates to a clutch-clutch release device used in a motor vehicle for transmitting an axial force between a non-rotating part and a part of a motor vehicle. rotating.

In the automotive field, it is known to use a clutch-clutch release actuated by a movable member in translation to engage a manually or automatically controlled gearbox. To do this, the clutch-disengagement stop device comprises a bearing with rolling elements housed between a rotating ring and a non-rotating ring pushed by the movable member in translation. In contrast, the device comprises an actuating member, of the diaphragm type with nozzles, pressure plate or levers, intended to be actuated axially by the rotating ring, the said actuating member consequently causing rotating mechanical elements allowing the setting implementation of the gearbox. It may be provided to mount the clutch release-clutch device in a fixed housing so that all of the components of said device are partially fully immersed in a fluid, for example oil.

However, the contact between the rotating ring and the actuating member is not integral, being only the result of a mainly axial force. When the clutch-disengaging device is rotating, the axial force generates a rotational drive torque between the rotating ring and the actuating member. Under these conditions, it is possible that these two elements can slide relative to each other and metal particles can be generated. This can cause wear of the actuating member and a pollution of the fluid in which are immersed the ring and the actuating member. It is known to provide surface treatments, for example carbonitriding, to increase the surface hardness and prevent the formation of metal particles. However, this solution is relatively expensive.

It is these problems that the invention more particularly intends to provide by proposing a new clutch-clutch release device in which the contact portion between a rotating ring and an actuating member is improved by means of a construction particularly simple and economical to implement.

To this end, the invention relates to a device for clutch release clutch of a motor vehicle, this device comprising a bearing forming a transmission member of an axial force, with a rotating ring and a non-rotating ring between which is defined a rolling chamber for rolling elements, and an actuating member in contact with a substantially radial surface with the rotating ring. According to the invention, at least one element between the rotating ring or the actuating member is provided with at least one projecting relief created by localized plastic deformation of said element, said relief cooperating with a retaining means of the another element so as to prevent relative rotation between the rotating ring and the actuating member. Thanks to the invention, the drive by friction between the actuating member and the rotating ring is eliminated, thereby reducing the wear of these elements and avoiding environmental pollution. In addition, the means used are simple to implement because there are many ways to perform plastic deformations of a metal part, for example by embossing material or punching. According to advantageous but not obligatory aspects of the invention, such a stop device may incorporate one or more of the following features taken in any technically permissible combination: The rolling elements of the bearing are balls. - The rolling elements of the bearing are held more or less evenly spaced circumferentially by a cage. - 3 - - The rotating ring comprises a toric portion having a concave surface forming a track for the rolling elements. - The rotating ring comprises a radial portion defining a substantially radial contact surface with a substantially radial portion associated with the actuating member. - The radial portion of the rotating ring is directed radially away from the axis of rotation of the device. - The toric portion and the radial portion of the rotating ring are interconnected by an intermediate portion of frustoconical shape. - The rotating ring and the non-rotating bearing ring are formed from stamped metal sheets. - The rotating ring is an inner ring of the bearing and the non-rotating ring is an outer ring of the bearing. - The actuating member is a pressure plate annular shape and having a radial portion. - The actuating member is a diaphragm comprising notches extending substantially radially. - The relief is projecting axially on one or the other of the rotating ring or the actuating member. - The relief is radially projecting on one or the other of the rotating ring or the actuating member. - The relief is formed on the substantially radial portion of the actuating member. - The relief formed on the substantially radial portion of the actuating member is a curved area parallel to the axis of rotation of the device and directed towards the rolling elements. - The cylindrical outer edge of the radial portion of the rotating ring is provided with a retaining means consisting of at least one flat, said flat is intended to cooperate with the raised projection of the actuating member. - The actuating member is provided with a relief consisting of at least one axial flange extending axially from the inner edge of the substantially radial portion of the actuating member in contact with the rotating ring. - 4 - - At least one retaining means is formed at the inner edge of the rotating ring by a recess obtained by embossing material made substantially parallel to the axis of rotation of the device, the rim of the body of actuation being housed in said recess. - The relief is formed on the radial portion of the rotating ring. - The relief formed on the radial portion of the rotating ring is a curved area parallel to the axis of rotation of the device and directed towards the pressure plate, that is to say the opposite of the rolling elements. - The actuating member is provided with a retaining means consisting of at least one recess on the radial surface of the substantially radial portion in contact with the rotating ring, said recess receiving the relief formed on the rotating ring. - The relief formed on the radial portion of the rotating ring is a bead radially projecting on the inner edge of said radial portion and directed perpendicular to the axis of rotation of the device. The bead is obtained by embossing material made substantially parallel to the axis of rotation of the device. - The actuating member comprises in the inner edge of the substantially radial portion bearing against the rotating ring a substantially axial flange and directed towards the rolling elements. Said flange comprises at least one recess in which is housed the relief formed on the rotating ring. - The actuating member and the rotating ring cooperate with the combination of a plurality of reliefs and retaining means regularly spaced circumferentially. - The actuating member and the rotating ring cooperate with the combination of a single relief and a retaining means extending over an angular sector strictly less than 3600. - The angle at the top of the angular sector in which extends each relief and associated retaining means is between 3 ° and 30 °, and preferably equal to 10 °. The invention also relates to a motor vehicle equipped with a device as mentioned above, for the clutch-disengagement of its gearbox. The invention will be better understood and other advantages thereof will emerge more clearly in the light of the following description of three embodiments of a clutch-disengagement stop device according to its principle, given only by way of example and with reference to the accompanying drawings, in which: - Figure 1 is an axial half-sectional view II of a clutch release device-clutch according to a first embodiment of the invention; FIG. 2 is a perspective view of the rotating ring of this device; - Figure 3 is a view along a section II-II of this device; FIG. 4 is a view in axial half-section III-III of a clutch-clutch release device according to a second embodiment of the invention; - Figure 5a is a perspective view of the rotating ring of this device; FIG. 5b is a perspective view of the actuating member of this device; - Figure 6 is a view along a section IV-IV of this device; FIG. 7 is an axial half-section view V-V of a clutch-clutch release device according to a third embodiment of the invention; - Figure 8 is a perspective view of the rotating ring of this device; and FIG. 9 is a view of a section VI-VI of this device. The device 1 with clutch release clutch shown in Figures 1 to 9 is intended to be mounted on a motor vehicle to transmit an axial force F1 exerted by a movable member in translation 2, shown in phantom only in Figure 1 , to an actuating member 3. The movable member in translation 2 may be a piston under hydraulic pressure controlled by a control member. In Figures 1 to 9, the actuating member is a pressure plate 3. According to variants not shown, the actuating member may be a bored diaphragm or levers without this coming out of the framework of the invention.

X1 is the central axis of the device 1 clutch release clutch, the axis of rotation of the pressure plate coinciding with X1 in normal operating mode of the device 1. Thereafter, to facilitate the identification of the stop 1 in space, defines an inner side Ci corresponding to the main axis X1, and an outer side Ce opposite the axis X1 by the device 1. In addition, for this embodiment and for the following, the adjectives "axial" and "radial" and the adverb "axially" are defined relative to the central axis X1 of the abutment 1. Thus, a portion or axial portion is parallel to the axis X1, while a portion or radial portion is perpendicular to this axis and surrounds it. For example, a radial portion is provided with an inner surface oriented towards the inner side Ci of the abutment 1, thus towards the axis X1, and of an outer surface oriented away from this axis, towards the outer side The stop device 1 comprises a ball bearing 4 comprising an outer non-rotating ring 41 and a rotating inner ring 42 between which is defined a rolling chamber 43. A single row of rolling elements 44, here balls, is disposed in the rolling chamber 43 being held in position by a cage 45. Note X4 the central axis of the bearing 4, that is to say the relative rotation axis of the rings 41 and 42 one with respect to the other. In normal operating mode of the device 1, the axes X1 and X4 are merged. The outer ring 41 comprises an axial tubular portion 411 whose surface on the inner side Cc defines a concave surface serving as a raceway for the balls 44. The tubular portion 411 extends radially through a radial portion 412 substantially perpendicular to the axis X4, whose internal radial edge 412 defines a bore 041. The piston 2 abuts against this radial portion 412 along a radial surface 21. The inner ring 42 comprises a toric portion portion annular 421 whose surface on the outside This defines a concave surface serving as a raceway for the balls 44 and whose surface on the inner side Cc defines a bore 042. The toric portion extends axially by an intermediate portion 422 of frustoconical shape, itself extending radially. by a radial portion 423 annular and substantially perpendicular to the axis X4. The pressure plate 3 comprises a radial portion 31 bearing against this radial portion 423 along a radial surface 32a.

The outer 41 and inner 42 rings are made from stamped metal sheets. According to a first embodiment shown in FIGS. 1 to 3, the radial portion 31 of the pressure plate 3 comprises a projection 33 projecting axially and created by elastic deformation of said radial portion 31. A chute 34 is formed on a surface radial 32 of the radial portion 31 which is in the direction opposite to the rolling elements 44. This chute 34 is made by locally deforming this portion 31, so that the concavity of the chute 34 is facing away from the rolling elements 44. In other words, the chute 34 constitutes the relief 33 by an axially convex zone on the surface 32a towards the elements. The radial portion 423 of the inner ring 42 comprises an outer edge 423a axial and directed towards the outer side Ce of the device. According to this first embodiment, the outer edge 423a of the radial portion 423 comprises a flat 424. The relief 33 is at a strictly lower diameter of the outer diameter of the outer edge 423a. The radial portion 423 of the inner ring 42 being in abutment against the radial portion 31 of the plate 3, the flat portion 424 of the inner ring 42 comes substantially in abutment with or immediately adjacent the relief 33 of the plate 3 so as to co-operate with relative rotation between the inner ring 42 and the plate 3. With this first embodiment, the outer edge of the flat 424 is locked in rotation by said relief 23, thus avoiding any relative rotation and thus friction between the two elements . According to a second embodiment shown in FIGS. 4 to 6, in which the identical elements have the same references, the device 1 differs from the previous embodiments in that the inner ring 42 comprises a relief 429 projecting radially. and cooperating with the plate 3. The relief 429 is formed at a radial surface 423c of the radial portion 423 which is in the opposite direction to the rolling elements 44, at the intersection with the intermediate portion 422. This relief 429 is made by repoussage of material of this portion 423, thus forming a recess 428 and a bead 429 directed radially towards the inner side Ci of the device. The radial portion 31 of the pressure plate 3 comprises an inner edge provided with a flange 36 formed by plastic deformation of the edge of said radial portion 31. The flange 36 comprises a recess 37 in which is housed the bead 429 of the ring internally 42 so as to block the relative rotation between the inner ring 42 rotating and the plate 3. According to a third embodiment shown in Figures 7 to 9, wherein the identical elements have the same references, the device 1 differs from the mode preceding embodiment in that the inner ring 42 comprises a relief 425 projecting axially and cooperating with the plate 3. A chute 426 is provided at a radial surface 423b of the radial portion 423 which is in the direction of the rolling elements 44. This chute 426 is made by locally deforming the end of this portion 423, so that the concavity of the chute 426 is turned to the rolling elements 44. In other words, the chute 426 constitutes the relief 425 by a zone bulged axially towards the radial surface 32a bearing with the plate 3, opposite the rolling elements 44.

The radial portion 31 of the pressure plate 3 comprises a recess formed on the radial surface 32a in which the relief 425 of the inner ring 42 is housed so as to block the relative rotation between the inner ring 42 rotating and the plate 3. - 9 - The number of reliefs 33, 429, 425 and retaining means 424, 37, 35 associated respectively may be chosen by the designer of the device 1. It must be greater than or equal to 1, preferably equal to 4 as represented in FIG. Figures 1 to 3 and 7 to 9, or 2 as shown in Figures 4 to 6.

Each relief and associated retaining means extends over an angular sector whose apex angle i3 is between 3 ° and 300, preferably equal to 100. The invention is described above in the case of the use of a ball bearing. It can also be used with other rolling elements, in particular pebbles or needles. The technical characteristics of the embodiments and variants envisaged above can be combined with each other.

Claims (4)

REVENDICATIONS1. Device (1) with clutch release clutch for a motor vehicle comprising: - a bearing (4) forming a transmission member of an axial force (F1), with a rotating ring (42) and a non-rotating ring (41) between which is defined a rolling chamber (43) for rolling elements (44), - an actuating member (3) in contact with a substantially radial surface (32a) with the rotating ring (42), and - at least a projection (425) projecting created by plastic deformation and formed on a radial portion (423) of the rotating ring (42) in contact with the substantially radial surface (32a) of the substantially radial portion (31) of the body actuation (3), said relief (425) cooperating with a retaining means (35) of the actuating member (3) so as to prevent relative rotation between the rotating ring (42) and the body actuation (3), characterized in that - the relief (425) is a convex zone parallel to the axis of rotation (X1) of the device (1) and directed towards the actuating member (3), that is to say the opposite of the rolling elements (4), and - the retaining means (35) of the actuating member (3) consists of at least one recess on the radial surface (32a) of the radial portion (31) in contact with the rotating ring (42), said recess (35) receiving the relief (425) formed on the rotating ring (42). 2. Device (1) according to any preceding claim wherein the actuating member (3) and the rotating ring (42) cooperate with the combination of a plurality of reliefs (425) and means of retainer (35) regularly spaced circumferentially. 3. Device (1) according to any one of the preceding claims wherein the apex angle (3) of the angular sector in whicheach relief relief (425) and retaining means (35) associated is between 3 ° and 300, and preferably equal to 100. 4. Motor vehicle equipped with a stop (1) according to one of the preceding claims.