Nsk Corporation

Nsk Steering Systems Co., Ltd.

Takanori Ooshima

Yasushi Watanabe

Shiyouichi Abe

Kiyoshi Ookubo

In relation to a rocker arm obtained by applying cold forging to a blank made from a metal wire rod, cold forging is applied to a blank obtained by cutting a metal wire rod to a predetermined length to make a second intermediate blankhaving a pair of side wall sectionsand a basewhich connects the two side wallsat one of their respective widthwise edges. Punching is applied to the baseof this second intermediate blankto form a first and a second connection sections. In the case where it is assumed that a rolleris arranged at a position corresponding to an arrangement position of the rollerof the rocker arm to be obtained, on the inside of the second intermediate blankwhich is to be subjected to punch processing, the rollerand the basedo not interfere with each other. As a result, performance improvement of an engine fitted with this rocker arm is obtained.

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Gunma, Japan

Takanori Ooshima