Machine element or mechanism – Gearing – Teeth
Patent
1985-04-30
1987-05-19
Hermann, Allan D.
Machine element or mechanism
Gearing
Teeth
744248R, 74425, F16H 116, F16H 108
Patent
active
046657657
ABSTRACT:
An anti-friction worm-worm gear type speed reducer torque converter is disclosed. The speed reducer has a rotatably mounted worm gear adapted to mesh with a rotatably mounted worm incorporating a plurality of circulating rolling elements. In one embodiment, the configuration of the spiral thread of the worm is such that the balls incorporated in the load carrying side face of the spiral thread provide a substantially continuous substantially spiral shaped contact line with the load transmitting tooth of the worm gear. This is accomplished by providing the helicoid spiral thread of the worm with a flat, approximately bell shaped profile in the radial direction, with reference to the longitudinal axis of the worm, and by gradually modifying the trapezoidal dimensions of the spiral thread in axial cross-section. In another embodiment, the helicoid spiral thread of a worm is substantially uniform throughout the entire threaded portion of the worm, and tapered needles are retained in channels machined in the side faces of the spiral gear. The worm having circulating tapered needles can also engage a conventional trapezoid threaded nut to provide a "needle screw" useful in such applications where conventional ball screws are used.
REFERENCES:
patent: 657349 (1900-09-01), Jones
patent: 731527 (1903-06-01), Wagner
patent: 1164847 (1915-12-01), Neubauer
patent: 1307462 (1919-06-01), Steffensen
patent: 1347802 (1920-07-01), Botts
patent: 1885970 (1932-11-01), Westling
patent: 3081639 (1963-03-01), Hauptmann
patent: 3377879 (1968-04-01), Shiwaku
patent: 3494215 (1970-02-01), Fengler
patent: 3581592 (1971-06-01), Roehrs
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