Brake valve with prefill chamber unloading valve

Details Brake valve with prefill chamber unloading valve Brake valve with prefill chamber unloading valve

1994-02-25

1995-03-07

Look, Edward K.

Power plants

Pressure fluid source and motor

Pulsator

60581, 60585, 60591, F15B 700, B60T 1126

Patent

active

053947010

ABSTRACT:
Left and right two stage brake valves communicate fluid pressure to left and right brake mechanisms, each brake valve having an inlet for receiving pressurized brake fluid, a reservoir, a stepped bore and a stepped piston. The stepped bore and the stepped piston forming a high volume prefill chamber and a high pressure chamber. A prefill drain valve communicates the prefill chambers to the reservoir only when pump pressure is available at the inlet and blocks communication between the left and right prefill chambers and between the prefill chambers and a reservoir when pump pressure is not available at the inlet.

REFERENCES:
patent: 4408805 (1983-10-01), Edwards et al.
patent: 4463562 (1984-08-01), Taft
patent: 4464899 (1984-08-01), Myers et al.
patent: 4534171 (1985-08-01), Leiber
patent: 4624108 (1986-11-01), Leiber
patent: 4641497 (1987-02-01), Kervagoret
patent: 4738109 (1988-04-01), Miller et al.
patent: 5221126 (1993-06-01), Inoue
Eagles, D. M., "Hydraulic System of John Deere 7000 Series Tractors", Paper No. 931613, 14 Dec. 1993.

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