Ball screw

Machine element or mechanism – Gearing – Directly cooperating gears

Reexamination Certificate

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Details

C074S424820

Reexamination Certificate

active

07080571

ABSTRACT:
A ball screw has a screw shaft including a spiral-shaped ball rolling groove formed in an outer peripheral surface thereof; a nut including a spiral-shaped ball rolling groove formed in an inner peripheral surface thereof; a plurality of balls disposed in a raceway formed by the two rolling grooves; and, a return path for moving the balls from the terminal point of the raceway to the start point of the raceway, the two end portions of the return path respectively including a rising surface rising from the ball rolling groove of the nut and a stopper portion disposed opposed to the rising surface to form the end portion of the raceway, wherein a boundary portion between the rising surface and the ball rolling groove of the nut is formed a round portion having the radius of curvature 0.05 times the diameter of the ball or more.

REFERENCES:
patent: 477642 (1892-06-01), Brunthaver
patent: 3580098 (1971-05-01), Goad
patent: 6112610 (2000-09-01), Welling
patent: 6192585 (2001-02-01), Buchanan et al.
patent: 6286383 (2001-09-01), Shirai et al.
patent: 6397697 (2002-06-01), Ninomiya et al.
patent: 6561054 (2003-05-01), Chiu et al.
patent: 6581489 (2003-06-01), Ohkubo
patent: 2002/0023513 (2002-02-01), Sekiya et al.
patent: 42 35 842 (1999-08-01), None
patent: 100 42 610 (2001-06-01), None
patent: 101 10 220 (2001-09-01), None
patent: 2001-141019 (2001-05-01), None

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