Method of producing screw device, and screw device

Abstract

A method of producing a screw device, having high productivity and capable of achieving sufficient strength of a nut. The method of producing a screw device has a groove forming step for previously forming a load ball rolling groove in a flat plate, which step is followed by a nut forming step for forming a nut by bending the flat plate into a ring. Since the method has, after the groove forming step in which the load rolling groove is formed in the flat plate, the nut forming step in which the flat plate is bent into a ring, sufficient strength of the nut can be easily achieved, and in addition, high compression stress is left in the load ball rolling groove in the inner diameter surface of the nut.

Description

Technical field [0001] The invention relates to a threaded device in which rolling bodies are interposed between a threaded shaft and a nut and can perform rolling motion. Background technique [0002] In the process of generalization of electric power steering devices, thinner nuts and simplification of cycle manufacturing are increasingly required. The current trend is that a deflector type ball screw has become the mainstream. In the ball screw of the deflector method, a deflector (also called a "block") is embedded in the nut to circulate the balls. The deflector forms a load connected to less than one circle. Return grooves at both ends of the ball rolling groove. In addition, the return groove of the deflector causes the balls rolling in the spiral load ball rolling groove around the threaded shaft to pass the thread of the threaded shaft before turning around the threaded shaft and return to the front of this circle. The ball rolling groove. [0003] From the viewpoint o...

AI Technical Summary

Problems solved by technology

However, on the contrary, it is difficult to ensure the strength of the ball screw nut

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