Screw spindle

Details Screw spindle Screw spindle

1976-10-21

1978-01-31

Bertsch, Richard A.

Machine element or mechanism

Gearing

Teeth

308 6C, 308189R, F16H 2522, F16H 118

Patent

active

040709213

ABSTRACT:
A screw spindle drive comprising a spindle with one or more thread grooves of circular cross-section, a nut with a complimentary groove or grooves, and a closed ring of balls in each raceway formed by a groove in the spindle and a corresponding groove in the nut has the pitch of each raceway less than the product of the ball diameter and the number of raceways. The thread grooves have a radius of curvature equal to that of the balls but their depth is less than this radius. A return groove in the nut has only to be deep enough to allow the balls to ride over the ridge between turns of the thread groove. The balls can be held by permanent or temporary cages for ease of assembly.

REFERENCES:
patent: 3186250 (1965-06-01), Boutwell
patent: 3234810 (1966-02-01), Orner
patent: 3372605 (1968-03-01), Orner
patent: 3638507 (1972-02-01), Orner
patent: 3673886 (1972-07-01), Tomita

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