Roller screw system

Details Roller screw system Roller screw system

2006-05-16

2006-05-16

Ridley, Richard W. (Department: 3682)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S424810, C074S424820, C074S424920

Reexamination Certificate

active

07044017

ABSTRACT:
A higher efficiency roller screw system that includes a nut body designed to engage a threaded shaft. The nut body includes a center bore with closed, partial helical grooves formed therein. Disposed inside the center bore is a shaft with open helical threads formed thereon. A plurality of rollers with non-helical grooves formed thereon are also disposed inside the nut body's center bore and longitudinally aligned with the shaft. The grooves on each roller are designed to engage the grooves on the nut body and the threads on the shaft. The nut body includes a cross-over region where the trajectory of the internal grooves extend radially outward and axially. When the rollers' grooves contact the grooves in the cross-over region, the rollers are forced outward to maintain contact with the grooves on the nut body and are deflected axially. When they move outward, they disengage from the helical threads on the shaft. As the nut body continues to rotate, the grooves on the rollers maintain contact with the grooves on the nut body and re-engage the helical threads on the shaft.

REFERENCES:
patent: 2683379 (1954-07-01), Strandgren
patent: 3595094 (1971-07-01), Lemor
patent: 3726151 (1973-04-01), Lemor
patent: 3744332 (1973-07-01), Nilsson
patent: 3884090 (1975-05-01), Dock
patent: 4050319 (1977-09-01), Stanley
patent: 4375770 (1983-03-01), Druet
patent: 4884466 (1989-12-01), Duruisseau
patent: 5809837 (1998-09-01), Shaffer
patent: 6170351 (2001-01-01), Zernickel

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