Hydraulic control system for a V-belt transmission

Details Hydraulic control system for a V-belt transmission Hydraulic control system for a V-belt transmission

1983-04-26

1985-08-13

Herrmann, Allan D.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

474 18, 474 28, 474 70, B60K 4114, F16H 5552

Patent

active

045342431

ABSTRACT:
An automatic transmission provided with a combination of a belt drive continuously-variable speed transmission mechanism and a hydraulic control circuit. The belt drive continuously-variable speed transmission mechanism has an input variable-pitch pulley assembly and an output variable-pitch pulley assembly. The hydraulic control circuit includes a regulator valve, a throttle pressure valve, a reduction ratio detecting valve, a reduction ratio control valve and a reduction ratio control mechanism. The reduction ratio control valve has an axially slidable spool and two pressure chambers formed in the valve body thereof at both axial ends of the spool respectively. The reduction ratio control mechanism includes conduits for conducting the working fluid of a throttle pressure to the pressure chambers of the reduction ratio control valve and two solenoid valves adapted to drain the corresponding pressure chambers, respectively, when actuated.

REFERENCES:
patent: 3115049 (1963-12-01), Moan
patent: 4419910 (1983-12-01), Miki et al.

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