| 摘要 |
In order to improver a response of a rocker arm by reducing a moment of inertia of the rocker arm around a pivot portion thereof, the invention provides a rocker arm comprises a metal-plate-made rocker arm main body including a pivot portion and a valve stem guide portion respectively formed in the longitudinal-direction two end portions thereof. In the provided rocker arm, the center-of-gravity position of the rocker arm main body is set at a position shifted to the pivot portion side from the longitudinal-direction center thereof. Moreover, The clearance between a pair of opposing side wall portions formed in the valve stem guide portion is set narrow so that the center-of-gravity of the rocker arm main body can be set at a position shifted to the pivot portion side from the longitudinal-direction center thereof.
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