Other

Honda Motor Co., Ltd.

Tanaka Seimitsu Kogyo Co., Ltd.

Takaaki Harasaki

Atsushi Takahashi

Noriyuki Yamada

Chikara Tanaka

Atsushi Murakami

Takeya Harada

Keiichi Maekawa

Masayasu Tajima

Abrasion resistance is further enhanced in a sliding member used in an internal combustion engine. With respect to a valve lifterused in an internal combustion engine, hard particles having higher hardness than the valve lifterare dispersed onto the top faceof the valve lifter, and a nitriding treatment is conducted on the top facedispersed with the hard particles.

Sliding member and surface treatment method for the same

The present invention provides a valve operating system for internal combustion engines, having a roller rolling contacting a valve operating cam, the system being provided with an oil supply passage capable of reducing a pressure loss to a low level even when a flow rate of lubricating oil entering the oil supply passage increases in accordance with a heightened engine speed, improving the lubricating ability with respect to the roller, and attaining a long lifetime of a rocker arm. This valve operating system includes a rocker arm support member provided with an oil passage in an inner portion thereof, a cam shaft provided on a valve operating cam, and a rocker arm which is provided with a roller rolling contacting the valve operating cam, and which is provided in an inner portion thereof with an oil supply passage for supplying a lubricating oil from the rocker arm support member to the roller, the sectional area of the flow passage of the oil supply passage increasing gradually from an opening thereof on the side of the roller toward an opening thereof on the side of the rocker arm support member.

Valve operating system for internal combustion engines

Growing community of inventors

Toyama, Japan

Takaaki Harasaki