Patent ID: 8960145
Filing Date: 2015-02-24
Classification: F01L

Abstract:
1. A valve gear that operates an intake valve or an exhaust valve of an engine provided with a plurality of cylinders, the valve gear comprising: a cam shaft that operates in association with rotation of an output shaft of the engine; a pivot mechanism that is operated by a driving cam of the cam shaft and causes either the intake valve or the exhaust valve to reciprocate using a pivot member; and a case member that accommodates the cam shaft and the pivot mechanism in such a manner that the cam shaft and the pivot mechanism are movable before the engine is installed to a cylinder head, the cam shaft, the pivot mechanism and the case member being unitized into a unit, wherein the case member is removably installed to either an intake side or an exhaust side so as to be laid on the cylinder head from above while extending over the plurality of cylinders, and includes end wall portions disposed at both ends in a direction in which the cylinders are arranged, an inter-cylinder wall portion disposed between adjacent cylinders, connection wall portions configured to extend in the direction in which the cylinders are arranged and to connect the end wall portions and the inter-cylinder wall portion, and a floor portion that connects lower ends of the end wall portions, the inter-cylinder wall portion, and the connection wall portions, the case member forming a box shape.