US 7,467,702 B2
Clutch release bearing and method of manufacture
Sylvain Bussit, Tours (France); and Claude Caillault, Tours (France)
Assigned to Aktiebolaget SKF, Gothenburg (Sweden)
Filed on Jul. 05, 2005, as Appl. No. 11/175,013.
Claims priority of application No. 04 07390 (FR), filed on Jul. 02, 2004.
Prior Publication US 2006/0011445 A1, Jan. 19, 2006
Int. Cl. F16D 25/08 (2006.01); F16D 23/14 (2006.01)
U.S. Cl. 192—91A  [192/85 CA; 192/98] 10 Claims
OG exemplary drawing
 
1. Hydraulically operated clutch release bearing device of the type comprising an operating element provided with an annular piston and a seal in contact with the piston, and a rolling-contact bearing axially secured to the operating element, the piston comprising a rear surface in contact with the said seal, at least one concave region being formed in the said rear surface of the piston, wherein the at least one concave region occupies a limited portion of the rear surface of the piston, and wherein a cavity is defined by the seal and the concave region in the absence of hydraulic pressure, and wherein the cavity is at least partially filled by the seal when pressurized fluid is applied to the seal, and wherein at least one pip projects into the at least one concave region.