Valve operating device with stopping function for internal combustion engine

摘要

A valve operating device for internal combustion engine which includes a cam shaft rotated by a crankshaft and a rocker arm which follows the cam of the cam shaft to open and close an intake or exhaust valve of the engine. Oil-pressure-operated control is provided for suspending the operation of the intake or exhaust valve according to the operating conditions of the engine. For this purpose, a cam shaft passage is formed in an oil pressure supplying passage which extends from an oil pressure source through an oil passage in the rocker shaft to the control mechanism in such a manner that the cam shaft passage extends through one end portion of the cam shaft. A changeover valve for opening and closing the cam shaft passage is provided at the one end portion of the cam shaft. A centrifugal governor provided at the one end portion of the cam shaft rotates with the cam shaft and turns the changeover valve when the speed of the cam shaft is in a predetermined range, thereby to communicate the oil pressure source with the control mechanism.