Reduction ratio controlling mechanism for a continuously variabl

Details Reduction ratio controlling mechanism for a continuously variabl Reduction ratio controlling mechanism for a continuously variabl

1986-05-12

1987-10-13

Novosad, Stephen J.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Load responsive

474 28, 474 70, 74868, B60K 4114, F16H 5552

Patent

active

046996044

ABSTRACT:
A reduction ratio controlling mechanism provided within the hydraulic control system of a continuously variable automatic transmission of a vehicle including a V-belt type continuously variable transmission which comprises an input pulley and an output pulley, the effective diameter of each of said pulleys being variable by means of a corresponding hydraulic servomechanism, and a V-belt extending between said input and said output pulleys, for changing the reduction ratio of said continuously variable transmission by supplying a hydraulic fluid to and by draining same from the hydraulic servomechanism of said input pulley.
The reduction ratio controlling mechanism comprises an electromagnetic up-shift valve and an electromagnetic down-shift valve each capable of producing a solenoid pressure corresponding to the running condition of the vehicle by regulating the line pressure applied thereto, and a reduction ratio control valve having a spool movable under the control of the spring force of a spring provided on one side of the spool and the solenoid pressure applied to the other side of the spool.
The spring force of the spring works in the direction of movement of the spool during down-shift operation.

REFERENCES:
patent: 4419910 (1983-12-01), Miki et al.
patent: 4534243 (1985-08-01), Yokoyama et al.

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