Ntn Corporation

Mitsuhiro Nakayama

Ikuo Fujiniwa

Katsunori Mineno

In a clutch release bearing device, an inner ring () of a ball bearing () is pressed against a diaphragm spring () so that a clutch is disengaged. A contact member () made of steel is press-fitted to the inner ring () so that a convex spherical protruding portion () formed at an end portion of the contact member () is brought into contact with the diaphragm spring (). In addition, a contact position (C) between the protruding portion () and the diaphragm spring () is located between an extension line of an inner diameter (D) of the inner ring () and an extension line of an outer diameter (D) of the inner ring ().

Clutch release bearing device

A ball bearing retainer includes two annular members that face each other in an axial direction. The two annular members have opposed surfaces each including hemispherical pockets that are formed at a plurality of positions in a circumferential direction and configured to receive balls. The opposed surfaces are snap-fitted to each other so as to couple the two annular members to each other with coupling portions provided at both circumferential end portions of each of the hemispherical pockets Inner peripheral surfaces of the hemispherical pockets of the two annular members and the opposed surfaces of the two annular members have recessed grooves that are opened by extending from radially inner surfaces of the two annular members and reaching radially outer surfaces of the two annular members.

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Shizuoka, Japan

Mitsuhiro Nakayama