Continuously variable transmission with control of switching bet

Details Continuously variable transmission with control of switching bet Continuously variable transmission with control of switching bet

1996-03-22

1997-09-23

Wright, Dirk

Planetary gear transmission systems or components

Nonplanetary variable speed or direction transmission...

Nonplanetary transmission is belt or chain gearing

477 45, F16H 926

Patent

active

056698461

ABSTRACT:
A continuously variable transmission system includes a belt type continuously variable transmission unit (CVT) wherein the direction of torque transmission is switched by torque circulation between a low mode and a high mode accompanied by a change in the axial forces on the pulleys of the CVT. In the Low mode of the D range, a comparatively high hydraulic pressure from a regulator valve is supplied to a Low clutch hydraulic servo via a low-high shifting valve and to a secondary hydraulic servo. In addition, a comparatively low hydraulic pressure from a ratio control valve is supplied to a primary hydraulic servo. These oil pressure feeds are reversed by the switching of the low-high shifting valve.

REFERENCES:
patent: 4290320 (1981-09-01), Abbott
patent: 4402237 (1983-09-01), Tomlinson
patent: 4553450 (1985-11-01), Gizard
patent: 4644820 (1987-02-01), Macay et al.
patent: 5203233 (1993-04-01), Hattori et al.

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