Ball screw

Details Ball screw Ball screw

2006-07-25

2006-07-25

Joyce, William C. (Department: 3682)

Machine element or mechanism

Gearing

Directly cooperating gears

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.

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patent: 2001-141019 (2001-05-01), None

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