| 摘要 |
PURPOSE: A rocker arm is provided to secure strength around a mounting hole of an adjustment element, reduce the weight, reduce the working process, reduce the cost, and make the rocker arm compact in the longitudinal direction. CONSTITUTION: A rocker arm is rocked by a cam and the rocker arm actuates a valve of an internal combustion engine. The rocker arm comprises an arm body(4) prepared from a single plate material by a press work. The arm body includes a pair of side walls(5) opposite to each other and a connecting wall bridging between the opposite side walls and also has a pivot support portion, defined at a location generally intermediate of the length of the arm body, about which the rocker arm undergoes a rocking motion, and first and second ends opposite to each other. A roller(10) is rotatably mounted on the first end of the arm body and is engaged with the cam. An overlapped structure(13) includes an end overlap piece formed integrally with a side portion of the connecting wall adjacent to the second end of the arm body. The end overlap piece is bent backwardly to overlap the connecting wall to thereby define an adjustment element(16). The adjustment element has a mounting hole defined therein for adjustably receiving therein a valve driving member. |
