Toroidal continuously variable transmission

Details Toroidal continuously variable transmission Toroidal continuously variable transmission

2007-03-20

2007-03-20

Joyce, William C. (Department: 3682)

Friction gear transmission systems or components

Fluid control

Of toroidal transmission

C476S040000

Reexamination Certificate

active

10625470

ABSTRACT:
In a toroidal continuously variable transmission, a primary oil pump is driven by an engine, whereas a secondary oil pump is driven in response to rotation of a road wheel. A hydraulic servo mechanism is connected to a trunnion to create an offset of the trunnion from a neutral position for a tilting motion of the power roller. Also provided is a hydraulic system that supplies the hydraulic pressure discharged from the secondary pump to the hydraulic servo mechanism to prevent the offset of the trunnion in the trunnion-axis direction, corresponding to an upshift, occurring owing to rotation of the road wheel in a stopped state of the engine. A modulated hydraulic pressure, which is constantly produced by the hydraulic system during operation of the engine, acts to hold the secondary pump at either of an inoperative state and an unloaded condition during the operation of the engine.

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