Circulation passage structure for a ball screw

Details Circulation passage structure for a ball screw Circulation passage structure for a ball screw

2006-03-27

2009-12-08

Ridley, Richard W L (Department: 3656)

Machine element or mechanism

Gearing

Directly cooperating gears

Reexamination Certificate

active

07628090

ABSTRACT:
A circulation passage structure for a ball screw, the circulation passage structure is used to connect the helical groove and the circulation hole of the nut, so as to form a circulation path for a plurality of balls and spacers. Due to the spacers move in a manner of being clamped between two balls, the spacer inside the return path will be pushed to move inward. The degree of curvature of the inner guiding surface connected to the inner curve can be moderated by shifting outward the location of the center of the inner curve and increasing its radius of curvature. By such arrangement, the spacer will not contact the inner guiding surface when it is pushed to move inward, and the spacer can pass through the return passage easily without the problem of impacting the return passage.

REFERENCES:
patent: 5927858 (1999-07-01), Agari
patent: 7401978 (2008-07-01), Nakano et al.
patent: 2004/0211280 (2004-10-01), Nishimura et al.
patent: 2004/0237686 (2004-12-01), Watanabe

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