Motor vehicle throw-out bearing provided with a sealing device

Abstract

The invention relates to a motor vehicle throw-out bearing, including a rotatable ring (1) and a stationary ring (2) arranged so as to form therebetween at least one annular space (8) that is placed on one side of the raceway (5), said annular space being provided with a sealing device including a deflector (9) that is rigidly connected to a ring (1, 2), said deflector having two bearings (9a, 9b) that radially extend into the annular space (8) while being axially spaced so as to define an annular recess (10), said sealing device also including an insert (11) that is mounted onto the other ring (2, 1), said insert being placed in the annular recess (10) so as to form a U-shaped baffle (12), the arms of which are defined between, respectively, an inner surface of a bearing (9a, 9b) and an outer surface of said insert, the base of said baffle being defined between a bottom surface of the annular recess (10) and a free end surface of said insert.

Description

technical field [0001] The invention relates to a release bearing for a motor vehicle clutch, and an actuation system for a motor vehicle clutch comprising a diaphragm, such a release bearing and means for the axial movement of said release bearing relative to said diaphragm. Background technique [0002] In particular, the axial movement of the release bearing can be hydraulically controlled, in particular by means of a piston, for example a device called Concentric Slave Cylinder (CSC—Concentric Slave Cylinder). [0003] The release bearing consists of a rotating ring and a fixed ring. Each ring is equipped with a rolling rail. rotate. [0004] In particular, clutch release bearings used in such systems, especially for reasons of bulkiness of the hydraulic control unit, comprise an outer race which rotates about an inner race which is fixed in rotation, said outer race comprising a An actuation support surface actuated by bearing on the diaphragm between an engaged posit...

AI Technical Summary

Problems solved by technology

[0007] However, the frictional contact used in this embodiment has, inter alia, the disadvantage of inducing a frictional moment when the rings rotate relative to each other, and of being subject to wear leading to a deterioration over time of the imparted sealing function

[0008] In addition, in the application considered, since the release bearing is exposed to high temperatures, which can typically be higher than 160°C, the material of the gasket lip has a tendency to degrade, especially to lose its softness

As a result, the sealing performance of the clutch release bearing deteriorates during its service life

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