Ball screw mechanism, machining method for joint between nut...

Details Ball screw mechanism, machining method for joint between nut... Ball screw mechanism, machining method for joint between nut...

2008-03-04

2008-03-04

Ridley, Richard (Department: 3682)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S424870

Reexamination Certificate

active

07337689

ABSTRACT:
A ball screw mechanism including a screw shaft with a screw groove formed on an external surface, a nut with a screw groove formed on an internal surface, and plural balls held in the grooves. A ball circulation piece is fit in a window portion in the nut and has a circulation groove for circulating the balls. The screw groove of the nut and the circulation groove are machined by moving a tool of a diameter equal to or larger than the diameter of the balls, along the screw groove of the nut so that a step is eliminated at a joint therebetween. The infeed depth of the tool is gradually changed as the tool is moved toward the joint so that boundary lines between a machined surface and a non-machined surface on flanks of the screw groove of the nut extend at an acute angle to one another.

REFERENCES:
patent: 4177690 (1979-12-01), Klinkenberg
patent: 5005436 (1991-04-01), Brusasco
patent: 6092434 (2000-07-01), Matsumoto et al.
patent: 11-270648 (1999-10-01), None

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