Importance

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Abstract

A yoke of a universal joint is substantially U-shaped and includes a base portion and first and second arm portions. A method of producing the yoke includes the sequential steps of: (a) shearing a metal plate which is rectangular in shape and has certain uniform width and thickness so as to form a blank which is rectangular in shape and consists of a middle portion and first and second end portions; (b) squeezing the middle portion of the blank by cold forging so that the middle portion is expanded to have first and second peripheral bulge portions which are opposed to each other and that the expanded middle portion becoming substantially oval in shape and thinner than the first and second end portions in thickness; and (c) pressing the blank with a press machine to produce the yoke so that the expanded middle portion and the first and second end portions of the blank are turned into the base portion and the first and second arm portions of the yoke, respectively. According to the method, the amount of waste steel is substantially reduced. The yoke is light in weight and improved in strength.

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First Claim