Friction gear transmission systems or components – Stepless ratio change – Driving and driven gears on nonlinear angularly related axes
Patent
1994-01-06
1995-06-20
Marmor, Charles A.
Friction gear transmission systems or components
Stepless ratio change
Driving and driven gears on nonlinear angularly related axes
74348, F16H 1500
Patent
active
054256852
ABSTRACT:
A continuous variable-ratio transmission includes a first rotatable member whose exterior surface of revolution about its axis of rotation is defined by a tractrix curve. A rotatable conical member is mounted upon a first shaft and frictionally engages with the tractrix surface. The second rotatable member is moveable along the tractrix surface and has a shape such that for any position along the tractrix surface, the ratio of any two contacting circumferences of the conical surface and the tractrix surface is substantially equivalent to the ratio of any other two contacting circumferences. A first gear of a gear assembly is operably connected to the first shaft. A rotatable splined shaft extends axially through a second gear of the gear assembly and engages with a splined interior surface thereof to thereby permit the gear assembly to move along the splined shaft with movement of the conical member along the tractrix surface. The axis of rotation of the splined shaft is maintained at a substantially consistent angle relative to a tangent line at a friction point on the tractrix surface for any position of the conical member along the tractrix surface to thereby maintain contact between the conical surface and the tractrix surface along substantially an entire length of the conical surface at any position.
REFERENCES:
patent: Re23728 (1953-10-01), Teigman
patent: 861069 (1907-07-01), Wood
patent: 1055677 (1913-03-01), Sparks
patent: 1191771 (1916-07-01), Delacour
patent: 1359950 (1920-11-01), Beauvais
patent: 1443991 (1923-02-01), Hayden
patent: 3158041 (1964-11-01), Rae
patent: 3810401 (1974-05-01), Edlich
Fenstermacher David M.
Marmor Charles A.
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