Transmission ratio control system for a continuously variable tr

Details Transmission ratio control system for a continuously variable tr Transmission ratio control system for a continuously variable tr

1988-12-23

1990-12-18

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

474 28, B60K 4116

Patent

active

049777980

ABSTRACT:
A continuously variable transmission has a drive pulley having a shiftable disc, a driven pulley having a shiftable disc, a belt engaged with both pulleys, a transmission ratio control valve having a plunger slidably mounted in a valve body, a spool for controlling transmission ratio and, a spring provided between the plunger and the spool. A selector device is provided for selecting a high engine speed driving range. The selector device has an actuator responsive to the selection of the high engine speed driving range for shifting the plunger to increase the load on the spring, and a correcting lever for controlling the operation of the actuator in accordance with the transmission ratio. The correcting lever has a shape for providing a transmission ratio changing line where the transmission ratio changes with small change of the engine speed in an extreme low vehicle speed range and changes with larger change of the engine speed in a low and middle vehicle speed range than the extreme low vehicle speed range.

REFERENCES:
patent: 4627313 (1986-12-01), Sakai
patent: 4680991 (1987-07-01), Miyawaki
patent: 4730523 (1988-03-01), Takahashi

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