Fluid pressure control circuit for working vehicle having transm

Details Fluid pressure control circuit for working vehicle having transm Fluid pressure control circuit for working vehicle having transm

1988-01-12

1989-08-22

Garnett, Robert E.

Power plants

Pressure fluid source and motor

Having a mechanical clutch or brake device in the power train

60442, 60490, F16D 3102

Patent

active

048584355

ABSTRACT:
A fluid pressure control circuit for a working vehicle having a transmission operable by a fluid pressure and a negative type fluid pressure parking brake. The control circuit comprises a fluid pressure cylinder movable to a first end position to place the transmission in a low speed position and to a second end position to place the transmission in a high speed position, a fluid supply line for supplying pressure fluid to the cylinder, and a control valve mounted on the fluid supply line. The control valve comprises a three position valve having a first position to release the pressure fluid from the parking brake and the fluid supply line, a second position to supply the pressure fluid to the parking brake and set the cylinder to the first end position, and a third position to supply the pressure fluid to the parking brake and set the cylinder to the second end position.

REFERENCES:
patent: 3654762 (1972-04-01), Damon
patent: 4317331 (1982-03-01), Aruga et al.
patent: 4395878 (1983-08-01), Morita et al.
patent: 4464898 (1984-08-01), Aoyagi et al.
patent: 4481769 (1984-11-01), Nagahara
patent: 4495767 (1985-01-01), Akiyama et al.
patent: 4543786 (1985-10-01), Shuler
patent: 4566274 (1986-01-01), Heiser et al.

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