External circulation type ball thread device

Details External circulation type ball thread device External circulation type ball thread device

1995-07-20

1997-08-05

Herrmann, Allan D.

Machine element or mechanism

Gearing

Teeth

744248R, F16H 2522

Patent

active

056531451

ABSTRACT:
An external circulation type ball thread device includes a threaded shaft having a ball thread groove in the outer surface; a ball nut having a ball thread groove in the inner surface; and a number of balls fitted between those ball thread grooves, the balls being circulated while being led in a ball circulating tube which is secured to the outer surface of the ball nut with a tube retaining member. In the device, the ball nut has in the outer surface a tube supporting groove which is formed along the ball circulating tube which is arranged inclined with respect to the axis of the threaded shaft, to support the bottom of the ball circulating tube, and an annular groove which is formed across the tube supporting groove; and the tube retaining member is made of an elastic thin plate in such a manner that the tube retaining member is substantially C-shaped in section so as to be fitted in the annular groove, and has an engaging groove which is engaged with the ball circulating tube. Thus, the device is simple in structure and high in productivity.

REFERENCES:
patent: 2855790 (1958-10-01), Smith
patent: 3143896 (1964-08-01), Edwards

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