| 摘要 |
In producing a rocker arm, following steps are used: fabricating a rocker arm blank which includes: a rocker arm body having an aperture therein adapted to be converted to a hole for the insertion of a shaft, and which blank is made of a nitrided steel comprising specified amounts of C, Mn, Cr, Al, Si, P, S, Cu, Ni, one of Pb and Bi, and optionally Mo, and, as the balance substantially, Fe; and a slipper surface forming piece; subjecting the rocker arm blank to a refining treatment to adjust its hardness; subjecting the apertures to reaming to form the shaft insertion holes; and subjecting the rocker arm blank with the shaft insertion holes formed therein to a nitriding treatment. Thus, it is possible to mass-produce rocker arms for an internal combustion engine, each of which has excellent mechanical properties.
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