| 摘要 |
PURPOSE: A ball joint of a steering device for a car is provided to reduce a manufacturing cost by firmly coupling a female screw part formed on a rack bar and a male screw part formed on a ball housing without using any member. CONSTITUTION: A ball joint of a steering device for a car includes a female screw part(20), a male screw part(80), and a transformation area(90). The female screw part has inlets formed in the inside of both ends of a rack bar. The male screw part is formed at a side of a ball housing part to be coupled with the female screw part. The female screw part has teeth formed at a predetermined axial distances. The transformation area is formed at a part of the male screw part, and has an axial distance narrower than that of the teeth of the female screw part to transform the teeth of the female screw part.
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