Nhk Spring Co., Ltd.

Fcc, LLC

Kazuhiro Itonaga

Jun Tokumasu

Ichiro Sasuga

Kenjiro Kawanabe

Yutaka Nishida

A compression coil spring is used as a return spring which is stored in the housing of a clutch to urge the clutch piston in its returning direction. The effective number of turns of the compression coil spring is two or less, and the number of turns at an end-turn portion thereof is more than 0.45 and not more than 0.7. The compression coil spring is used in the compressed state throughout the operating stroke of the clutch piston. The number of turns at the end-turn portion is desirably within the range of 0.5 to 0.65, more desirably within the range of 0.55 to 0.62.

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Hamamatsu, Japan

Kazuhiro Itonaga