Toroidal continous variable transmission

Details Toroidal continous variable transmission Toroidal continous variable transmission

1995-03-08

1996-11-19

Herrmann, Allan D.

Friction gear transmission systems or components

Fluid control

Of toroidal transmission

477 50, F16H 1338

Patent

active

055757324

ABSTRACT:
Power rollers in a toroidal continuous variable transmission receive an external force from input and output discs. The external force is supplied to trunnions, so that pressure in one cylinder chamber becomes higher than that in the other, and a sleeve is urged to be shifted away from a neutral position. However, return force urging the sleeve back to the neutral position occurs. Since this return urging force is equal in magnitude to the external force and works in the direction opposite to that of the external force, the external force is offset by the urging force, and the trunnions are not displaced. Or, a controller outputs a control signal, corresponding to a difference between a target variable speed ratio and an actual variable speed ratio, to solenoid valves so as to generate in the cylinder chambers a pressure difference for offsetting the external force F. Accordingly the trunnions are maintained in the neutral positions, and a speed changing operation is not started again.

REFERENCES:
patent: 4669334 (1987-06-01), Miyaura et al.
patent: 5042326 (1991-08-01), Hibi et al.

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