Hydraulic control for a power transmission with a manual range s

Details Hydraulic control for a power transmission with a manual range s Hydraulic control for a power transmission with a manual range s

1988-08-11

1989-06-27

Diehl, Dwight G.

Machine element or mechanism

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

Preselected indexed position

74869, B60K 4106

Patent

active

048418161

ABSTRACT:
A control for a power transmission has a plurality of shift valves that are solenoid controlled, during normal operation, to establish the transmission ratios. A manual valve having a rotary valve is hydraulically connected with the shift valves and maintained in an inoperative position during normal operation. The manual valve is manipulable by an operator to selectively direct hydraulic signals to the shift valves if the solenoid controls become inoperative. The manual valve permits selection of a forward drive, a reverse drive and a neutral condition so that vehicle operation can continue when electrical power is unavailable for the solenoids.

REFERENCES:
patent: 3937108 (1976-02-01), Will
patent: 4345489 (1982-08-01), Muller et al.
patent: 4414863 (1983-11-01), Heino
patent: 4628772 (1986-12-01), Nishikawa et al.
patent: 4635508 (1987-01-01), Tatsumi

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