Self-centering self-aligning anti-friction rotor and screw

Details Self-centering self-aligning anti-friction rotor and screw Self-centering self-aligning anti-friction rotor and screw

1979-03-19

1981-06-23

Husar, C. J.

Machine element or mechanism

Gearing

Directly cooperating gears

74441, 74459, F16H 118

Patent

active

042742960

ABSTRACT:
A self-centering, self-aligning, anti-friction power transmission mechanism comprising a rotor cooperable with a screw to convert rotary movement to linear movement and vice versa. The rotor has one or more convolutions of rollers having their axes arranged in a helical path of the same pitch as the screw thread with their inner ends positioned to have non-scuffing, non-slipping rolling line contact with the screw thread, a result obtained by off-setting each roller axis downwardly along the helix from the line of contact by a distance such that the line of contact and the rotor axis lie in a common plane parallel to the roller axis. The screw thread is preferably of the Acme type with a sidewall taper initially slightly less than the taper of the roller ends in contact therewith whereby, in use under load, the rollers cause cold flow and work hardening of the thread sidewall thereby substantially increasing the length of the line of contact between the rollers and the screw thread.

REFERENCES:
patent: 3169407 (1965-02-01), Newell
patent: 3296880 (1967-01-01), Maroth
patent: 3308674 (1967-03-01), Maroth
patent: 3334526 (1967-08-01), Flarsheim
patent: 3648535 (1972-03-01), Maroth
patent: 3668940 (1972-06-01), Avena et al.
patent: 3720115 (1973-03-01), Vertin
patent: 3766788 (1973-10-01), Metz
patent: 3766800 (1973-10-01), Kennedy
patent: 3802290 (1974-04-01), Grove et al.
patent: 4008625 (1977-02-01), Malhotra

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