Patent ID: 7739991

Claim:
An adjustable valve drive device of an engine, comprising: a drive shaft provided in parallel to a crank shaft of the engine; a rocker cam operative to drive a valve, the rocker cam being supported at said drive shaft so as to be rocking; and a link mechanism coupled to a connection pin that is attached to said rocker cam, the connection pin having a pin axis that is provided so as to extend in parallel to said drive shaft, the link mechanism being configured to change a valve lift characteristic by controlling a rocking range of the rocker cam according to an engine operation state, wherein said rocker cam comprises a first split body with a cam profile face and a second split body without a cam profile, which are joined to one another by a fastening bolt with a joint split face thereof that is formed so as to contain an axial line of the drive shaft thereon, the first split body having a first pin support portion that supports one end portion of said connection pin, the second split body having a second pin support portion that is located so as to face the first pin support portion of the first split body and supports the other end portion of said connection pin, whereby the connection pin is supported at said first and second pin support portions at both end portions thereof so as to extend between the first pin support portion of the first split body and the second pin support portion of the second split body.