FR2662768A1 - Clutch release bearing - Google Patents

Abstract

Clutch release bearing, particularly for motor vehicle clutch mechanisms, consisting of a sleeve tube (2) with a sliding bearing surface, and a rolling-contact bearing (10) having a capability for displacement in at least one direction with respect to the sleeve tube, consisting of a rotating inner race (6), of a fixed outer race (7), extended radially by an assembly flange (border) (7a) joined to a corresponding flange (22) of the sleeve tube (2) by means of clips (23), characterised in that the front face (22a) of the radial flange (22) of the sleeve tube is connected to an axial part (24), bounded by a radial partition (25), carrying means (26) for retaining the lubricating agent for the rolling-contact bearing (10), and that the latter is located in the housing of the sleeve tube defined by the said axial part (24), partition (25), and by the wall (27) of the sliding bearing surface (4) of the sleeve tube (2).

Description

DEBRÀYÀGE STOP
The invention relates to a clutch release bearing, in particular for clutch mechanisms of motor vehicles, constituted by a sleeve with sliding range and a bearing having an omnidirectional capacity of displacement relative to the sleeve, constituted by a rotating inner ring, a fixed outer ring. , extended radially by an assembly border joined with a corresponding border of the sleeve by means of staples.

Publication EP-A 0 320 365 describes such a stop in which the declutching control force is exerted on the outer ring of the bearing.

Publication FR-A 2 255 502 describes a clutch release bearing in which the clip comes into contact with the fork for transmitting the control force. In this example, the bearing has a radial size equivalent to that of the sleeve and participates in the transmission of the clutch control effort without risk of deformation of the components of the stop.

When it is desired to reduce the axial size of the stop, the latter must be produced according to the aforementioned state of the art.

 I1 results in an increased risk of deformation of the bearing following an axial bending of the radial edge of the sleeve. To remedy this problem, publication EP-A 0 320 365 provides for associating with the sleeve a specially assembled reinforcement piece which simultaneously ensures contact with the fork. This assembly generates noise and significantly increases the axial size of the stop.

Another problem concerning these stops is linked to the risks of leakage of the bearing lubricating agent, following the deformation of the bearing.

These problems find an economical solution, the implementation of which is defined by the claims with reference to the appended drawing in which: - Figure 1 is an axial sectional view of the
stop, - Figure 2 is an axial section of the stop in
position of use according to line II-II of the
Figure 3, - Figure 3 is an elevational view of the stop
in use position.

Figures 1 to 3 show a clutch release bearing 1 with a sliding sleeve 2 made of a polyamide loaded for example with 50% glass fibers which give it good resistance to friction from a clutch release lever 3.

The sleeve 2 has a sliding surface 4 on a tubular guide 5 surrounding for example the input shaft of the gearbox under the action of the fork 3. The fork applies, as is well known, indirectly a declutching force in the direction of arrow F in FIG. 2 on the radial edge of the inner ring of the bearing 10. The latter has an inner rotating ring 6 in tale, a massive outer fixed ring 7 with a radial assembly edge 7a , rolling bodies 8 disposed between said rings and a fixed seal 9. The seal 9 is a conventional seal with a sealing lip. Furthermore, a rotating deflector ring 11 is integrated in the distribution cage of the rolling element 8 and is disposed between the bearing and a radial partition 25 of the sleeve 2 in order to avoid accidental leakage of the bearing grease from the bearing.

The sleeve 2 has, as shown in FIG. 1, a radial border 22 assembled to the corresponding border 7a of the ring 7 by two staples 23. The front face 22a of the border 22 is connected to an axial part 24, limited by the radial partition 25. The partition 25 carries complementary grooves 26 for retaining the bearing grease during the rotation of the inner ring 6 which prevent the radial transfer of the grease under the action of centrifugal force.

The bearing 10 is mounted with clearance in a housing 30 of the sleeve 2 defined by the axial part 24, the partition 25 and by the axial wall 27 of the sliding surface 4. The bearing 10 therefore has an omnidirectional capacity of displacement in the housing 30 under the action of the declutching force communicated by the fork 3 bearing on the rear face 22b of the radial edge 22 of the sleeve. The edges 7a and 22 are then in mutual friction relationship until a correct centering position is obtained inside the sleeve 2.

 The deflector ring 11 disposed in the radial plane of the grooves 26 avoids during operation of the stopper leakage of lubricant to the respective surfaces of the sleeve and of the ring in contact.

In order to allow a displacement of the sleeve, rapid centering of the bearing in its housing and a particularly soft friction contact, the sleeve is impregnated in particular along the edge 22a and its range 4, by a lubricating agent such as molybdenum disulfide.

Claims (1)

CLAIMS 1-) Release bearing, in particular for motor vehicle clutch mechanisms constituted by a sleeve (2) with sliding range and a bearing (10) having an omnidirectional capacity of displacement relative to the sleeve, constituted by an inner ring (6) rotating, an outer ring (7) fixed, extended radially by an edge (7a) of assembly joined with a corresponding edge (22) of the sleeve (2) by means of staples (23), characterized by the fact that the front face (22a) of the radial rim (22) of the sleeve is connected to an axial part (24), limited by a radial partition (25) carrying retention means (26) of the lubricating agent of the bearing ( 10) and that the latter is disposed in the housing of the sleeve defined by said axial parts (24), partition (25) and by the wall (27) of the sliding surface (4) of the sleeve (2>. 2g) Stop clutch release device according to claim 1, characterized by causes the rear face (22b) of the radial edge (22) of the sleeve to be in direct contact with the sliding control fork of the stop.  30) Release bearing according to claim 1,  characterized by the fact that the housing (30)  of the sleeve contains a deflector ring (11)  arranged in the radial plane of the grooves (26)  of lubricant retention carried by  the radial partition (25) of the sleeve.  49) A clutch release bearing according to claim 1,  characterized by the fact that the ring  deflector (11) is carried by the ring  inside of the bearing and constitutes the  distribution of rolling bodies. 50> Release bearing according to any one of  claims 1 to 4, characterized in that  that the sleeve is made of a polyamide  loaded with glass fibers and impregnated with  lubricant of the support area of the  fork and sliding surface.