Compact ball screw assembly

Details Compact ball screw assembly Compact ball screw assembly

1991-05-29

1992-12-08

Herrmann, Allan D.

Machine element or mechanism

Gearing

Directly cooperating gears

744248R, 74459, 184 99, 384 8, 384 99, F16H 2522

Patent

active

051687674

ABSTRACT:
A ball screw assembly includes a screw shaft hving a peripheral surface formed with a spiral groove, an outer sleeve fitted onto the screw shaft with a predetermined gap therebetween and a plurality of balls interposed between the screw shaft and the outer sleeve. A ball holder is provided in a radial hole formed in the outer sleeve and a ball is rotatably held in position and in engagement with the spiral groove by the ball holder. A fluid line is formed in the outer sleeve and the ball holder so that a pressuerized fluid may be supplied to establish a fluidic cushion between the ball holder and the ball. Also provided is a plurality of solid lubricants which are preferably arranged alternately with the balls and normally pressed against the spiral groove to keep the groove lubricated at all times.

REFERENCES:
patent: 2976736 (1961-03-01), Cook
patent: 3029792 (1962-04-01), Rasmussen
patent: 4741221 (1988-05-01), Hudimal, Jr.

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