Power plants – Pressure fluid source and motor – Pulsator
Patent
1994-02-25
1995-03-28
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60589, F15B 700, B60T 1128
Patent
active
054005957
ABSTRACT:
Left and right two stage brake valves communicate fluid pressure to left and right brake mechanisms. Each brake valve has an inlet for receiving pressurized brake fluid from a pump, a reservoir port, a stepped bore and a stepped piston member comprising a larger diameter prefill piston and a smaller diameter high pressure piston. The stepped piston is movable away from a rest position to transfer fluid to the brake mechanism. The stepped bore and the stepped piston form a high volume prefill chamber and a high pressure chamber. The high pressure piston has a groove communicated with the brake mechanism, and the groove communicates with the inlet when the high pressure piston has moved a certain distance to transfer fluid from the high pressure chamber to the brake mechanism. The prefill piston has a sealing land and a second land on either side of a sealing ring which is slidable in the stepped bore. The sealing land sealingly engages the sealing ring when the prefill piston moves to transfer fluid from the prefill chamber to the brake mechanism. The sealing land is spaced apart from the sealing ring by a distance which is greater than the distance between the groove and the inlet when the stepped piston is in its rest position.
REFERENCES:
patent: 4128249 (1978-12-01), Manzini et al.
patent: 4155223 (1979-05-01), Falk
patent: 4671168 (1987-06-01), Savvee et al.
patent: 4738109 (1988-04-01), Miller et al.
patent: 4852351 (1989-08-01), Price
patent: 5159871 (1992-11-01), Kehl
Eagles, D. M., "Hydraulic System of John Deere 7000 Series Tractors", Paper No. 931613, 14 Dec. 1993.
Deere & Company
Look Edward K.
Nguyen Hoang
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