Ball circulation screw gear

Details Ball circulation screw gear Ball circulation screw gear

1978-09-12

1981-03-31

Husar, C. J.

Machine element or mechanism

Gearing

Directly cooperating gears

74 8915, F16H 2920

Patent

active

042585848

ABSTRACT:
A worm gear is provided having a rotary worm screw which drives a reciprocal ball nut by means of a ball chain with coacting helical channeling effecting a raceway between the worm screw and ball nut. The invention resides in providing a ball return member in the interior of the worm screw such that a smaller number of balls in the ball chain may be used than has heretofore been possible in the prior art, and wherein friction is substantially reduced by the use of a smaller ball return channel in a median plane of the ball return member connecting at its ends with radial inlet and outlet channels. A considerable reduction in friction is achieved by the use of novel plastic bushings at the entrance and exit openings into the ball return member which greatly reduces the wear on the components.

REFERENCES:
patent: 2895343 (1959-07-01), Ovuer
patent: 2990157 (1961-06-01), McGuire
patent: 3161073 (1964-12-01), Deutsch et al.
patent: 3333484 (1967-08-01), Young
patent: 3924486 (1975-12-01), Taillardat
patent: 3971264 (1976-07-01), Detvaz

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