| 摘要 |
It is an object of the present invention to provide a rocker arm having such a shape as to avoid generation of defects in a producing process and to avoid increase in weight and design change of a finished shape. A valve fitting portion 11 of a body 5 is formed by wall-thickening one connecting wall 9 and recessing the connecting wall 9 upward. In the wall thickening, a periphery of the connecting wall 9 is pressurized and compressed from end face sides. As a result, defects such as cracking and sinking that occur in forcible guided-bending can be prevented and reduction of rigidity generated in compressing areas of the metal plate to be formed with side walls in wall thickness directions to reduce thickness of the areas as described in the description of the prior art can be avoided. Therefore, it is unnecessary to use a thick metal plate unlike in the prior art and to change design of the finished shape of the rocker arm body.
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