Continuously variable transmission

Details Continuously variable transmission Continuously variable transmission

1996-12-13

1998-08-04

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 48, F16H 926

Patent

active

057886008

ABSTRACT:
In a CVT transmission with planetary gear operation in forward, zero and reverse directions, reduction in CVT secondary/primary pulley ratio is inhibited when the pulley ratio is less than a set pulley ratio which is higher than the pulley ratio producing zero output rotation (a gear-neutral state). In a ratio region below the set pulley ratio, a movable sheave of a primary pulley is moved to an O/D side. The amount of the movement is detected by a sensor shoe (detecting means) which is associated with the movable sheave. A ratio sensing valve (inhibition means) associated with the sensor shoe, in turn, clogs a port, halting a hydraulic pressure supplied by a primary regulator valve. As a result, no hydraulic pressure is supplied to the second hydraulic chamber by way of a down-shift relief valve, a manual valve or a low-high control valve, inhibiting a down shift.

REFERENCES:
patent: 4644820 (1987-02-01), Macey et al.
patent: 5257188 (1993-10-01), Sakakibara et al.
patent: 5662547 (1997-09-01), Moroto et al.
patent: 5669846 (1997-09-01), Moroto et al.

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