Tokai Trw & Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Masahito Ishihara

Susumu Toki

Takahiro Okuyama

Masahito Iwata

A method for manufacturing a single-piece type valve sleeve, includes plastic-working a workpiece thereby to form in the workpiece a blind bore and a plurality of grooves in the surface of the bore and extending lengthwise of the bore, plastic-working a portion of the workpiece at the bottom of the bore so as to form a through hole in the workpiece, and plastic-working an inner portion of the workpiece adjacent the mouth of the bore thereby to close one end of the grooves. A single-piece type valve sleeve is produced by the method.

Method for manufacturing a single-piece type valve sleeve

The curved surface of the semi-spherical recess is defined such that a center of the curvature of the semi-spherical recess in a longitudinal section including a center line of the semi-spherical recess deviates from the center line, and a radius of curvature of the recess is greater than a radius of curvature of the spherical fitting portion.

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Kani, Japan

Masahito Ishihara