Patent ID: 7152320

Claim:
A method of manufacturing a rocker arm, the rocker arm comprising a pair of side wall sections provided with a space therebetween; a first connecting section and a second connecting section which connect corresponding portions near lengthwise opposite ends of the two side wall sections; and a pair of mutually concentric circular holes formed in the pair of side wall sections at mutually matching positions, wherein the first and second connecting sections have engagement sections which engage with a valve body and a rocking support member, the method comprising the steps of: (a) obtaining a starting blank by cutting a metal wire rod to a predetermined length, (b) making a first intermediate blank by applying cold forging to the starting blank by pressing the starting blank from lengthwise opposite sides; and (c) making a second intermediate blank by applying cold forging to the first intermediate blank by pressing the first intermediate blank from opposite sides which are perpendicular to the lengthwise direction.