Continuously-variable ratio transmission

Details Continuously-variable ratio transmission Continuously-variable ratio transmission

1984-11-19

1986-12-16

Dorner, Kenneth J.

Machine element or mechanism

Elements

Gear casings

74796, 74190, 74200, F16H 3706, F16H 1500

Patent

active

046287663

ABSTRACT:
A continuously-variable-ratio automotive transmission, typically of the toroidal-race rolling traction type, in which mechanism comprising a clutch, a brake and two epicyclic combinations--a reversing train and a mixing train--is interposed between the ratio-varying unit and the output of the transmission as a whole. By operation of the clutch and the brake the elements within the mechanism may be arranged in two different combinations whereby the transmission may operate in first and second "regimes", one or other of which will offer efficient transmission throughout the entire operating range of the source of the automotive power. The invention lies in a particular choice of the two different combinations resulting in reasonable containment of gear speeds, no requirement for power to be transmitted through the intermeshing gears of an epicyclic when the transmission is in its second (high gear) regime, and no interference between the final member of the transmission and any grounding that any items within it--for instance the planet carriers of the epicyclics--may require. The latter feature facilitates the use of a simple solid gear, rather than an annular one, as the final transmission member.

REFERENCES:
patent: 1817159 (1931-08-01), Morison
patent: 3244025 (1966-04-01), Francisco
patent: 3406597 (1968-10-01), Perry et al.
patent: 3494224 (1970-02-01), Fellows et al.
patent: 3545302 (1970-12-01), Schofield
patent: 4272999 (1981-06-01), Perry
patent: 4297918 (1981-11-01), Perry
patent: 4499782 (1985-02-01), Perry

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