Patent Number: 7,131,407

Title: Valve operating system for internal combustion engine

Abstract: A valve operating system includes: a decompression cam member that is provided on a camshaft, and moves between an operative position C where an exhaust tappet is operated in a valve opening direction in a compression stroke and an inoperative position D where the exhaust tappet is released; an exhaust gas recirculation cam member that is provided on the camshaft, and moves between an inoperative position F where the exhaust tappet is released and an operative position G where the exhaust tappet is operated in a valve opening direction in an intake stroke of the engine; and a common centrifugal mechanism that is driven by the camshaft to operate the decompression cam member to the operative position C in a starting rotation region of the engine and to the inoperative position D after the starting, and operate the exhaust gas recirculation cam member to the inoperative position F in a low speed operation region of the engine and to the operative position G in a high-speed operation region. Thus, the valve operating system can exert both a decompression function and an exhaust gas recirculation function.

Inventors: Kashima; Soji (Saitama, JP), Chiba; Shosaku (Saitama, JP), Yamada; Yoshikazu (Saitama, JP), Koga; Hibiki (Saitama, JP)

Assignee: Honda Motor Co., Ltd.

International Classification: F01L 1/00 (20060101); F01L 13/08 (20060101)

Expiration Date: 2019-11-07 0:00:00