Valve operating system for internal combustion engine

Abstract

In a valve operating system for an internal combustion engine in which two valves are simultaneously operated by one valve bridge, a roller is fitted to one end of a rocker arm 1, said roller pushing the valve bridge downward. A transverse force produced by the circular motion of the rocker arm merely causes rolling of the roller and is not delivered as a force of moving the valve bridge in the transverse direction. Thus, the valve bridge does not require any guiding mechanism for resisting against the transverse force. In addition, the depression bottom of each of the sleeves of the valve bridge is shaped flat, and the stem end of the valve in contact with the depression bottom is shaped spherical so as to contact the stem and with the depression bottom at one point on the spherical surface. Thus, even when a certain level difference is produced between the stem ends of valves, the contacting manner is not changed except that the contact point migrates to other point and, therefore, no level difference-removing means such as an adjuster are required.

Dependencies are inferred from the claim text.