Continuously variable speed transmission

Details Continuously variable speed transmission Continuously variable speed transmission

1990-11-21

1991-09-10

Bui, Thuy M.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Load responsive

474 28, F16H 6300

Patent

active

050469916

ABSTRACT:
A continuously variable speed transmission with parallel rotary input and output shaft which respectively carry first and second adjustable sheaves for an endless belt or chain. Each sheave has a first flange which is affixed to the respective shaft and a second flange which is movable axially of the respective shaft toward and away from the adjacent first sheave. A first cylinder and piston unit can receive hydraulic fluid from a first pump to urge the second flange of the first sheave against the adjacent portion of the belt or chain, and the same pump supplies fluid to a second cylinder and piston unit which urges the second flange of the second sheave against the adjacent portion of the belt or chain. A second pump serves to supply hydraulic fluid to a third cylinder and piston unit which is located radially inwardly of the first unit and is operable to change the transmission ratio. The second pump also serves to supply fluid to a torque sensor between a prime mover and the input shaft and, in accordance with one presently preferred embodiment, to a fourth cylinder and piston unit which is located radially inwardly of the second unit and is operable to change the transmission ratio. The fourth unit can be replaced with a diaphragm spring which is installed in the cylinder chamber of the second unit.

REFERENCES:
patent: 3893344 (1975-07-01), Dantlgraber et al.
patent: 4475416 (1984-10-01), Underwood

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