Patent ID: 7000582

Claim:
A rocker arm comprising a pair of side-wall sections separated from each other by a space, and a connecting section connecting the side-wall sections to each other in a widthwise direction of the rocker arm, the connecting section having a fitting surface on one surface thereof and with which an end face of a valve stem comes in contact, a pair of guide surfaces being provided to opposite sides of the fitting surface to prevent the valve stem from being displaced in the widthwise direction, the rocker arm being characterized in that the guide surfaces are non-parallel to each other with reference to a center axis of the valve stem, and a space between the guide surfaces is more narrow at a portion further from the fitting surface than at a portion nearer to the fitting surface, whereby a friction area between the guide surfaces and the valve stem is kept small, and wherein the guide surfaces are inclined such that the guide surfaces come closer to each other as they extend away from the fitting surface.