Toroidal type continuously variable transmission

Details Toroidal type continuously variable transmission Toroidal type continuously variable transmission

2007-04-17

2007-04-17

Joyce, William C. (Department: 3682)

Friction gear transmission systems or components

Fluid control

Of toroidal transmission

C476S040000

Reexamination Certificate

active

10459442

ABSTRACT:
When, with engine kept stopped, driven road wheels are turned, the toroidal type continuously variable transmission is suppressed from shifting toward a higher speed side. That is, when, with the engine kept stopped, the road wheels are turned in a reverse direction due to a traction of a motor vehicle with its front end facing backward, an extra oil pump driven by the road wheels produces an oil pressure which is applied to a hydraulic servo mechanism to keep a speed change ratio at a lower speed side. While, when, with the engine kept stopped, the road wheels are turned in a forward direction due to a traction of the motor vehicle with its front end facing forward, the oil pressure produced by the extra oil pump is not practically used. Under this condition, a biasing spring suppresses a servo piston from moving in a direction to bring about a speed change ratio for the higher speed side.

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