Honda Motor Co., Ltd.

Hisao Otsuka

Katsu Yoshimoto

Masashi Furuya

Hiroyuki Kawakubo

Toru Gunji

Yoshiki Nagahashi

Kazumitsu Yamamoto

Shinya Wakabayashi

Masaki Yoneyama

Hideo Senmyo

Masayoshi Suzuta

Hideaki Segami

Hiroshi Ori

In a multiple disc clutch apparatus, a cam memberwhich is disposed on a side of a clutch inner memberis formed into an annular shape. The cam memberextends in a radial direction so that an outer circumferential surface of the cam memberis brought into abutment with a cylindrical faceon an inner circumferential surface of a clutch center member

Multiple disc clutch apparatus

A threaded fastener is configured to reduce stress experienced at a female threaded portion of a hole formed in an engine block, when the threaded fastener is inserted therein, and when an axial load is applied thereto. In a particular application, a crankshaft is supported between a top supporting wall of a crankcase and a bottom supporting wall of a main cap. The inventive bolt includes a hollowed-out male threaded portion, which fits into a hole in the top supporting wall. The male threaded portion includes an elastically deformable low-rigidity portion, in which a cylindrical hole is concentrically formed. The maximum allowable stress of the top supporting wall is less than that of the bolt, due to material considerations. The low-rigidity portion is placed overlapping the female threaded portion in the axial direction, and since it is elastically deformable, it helps alleviate the stress experienced by the female threaded portion.

Threaded fastener for an internal combustion engine, and internal combustion engine incorporating same

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Saitama, Japan

Hisao Otsuka