Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber
Patent
1983-10-25
1985-12-31
Hershkovitz, Abraham
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
60484, 60486, 91531, 414687, 414694, F01B 2502
Patent
active
045613419
ABSTRACT:
A hydraulic circuitry for a backhoe in which a hydraulic motor for driving one of right and left crawlers and a hydraulic cylinder for vertically oscillating a working arm assembly are connected in parallel to each other to a first pump through a multiplex valve assembly having a first center bypass, and a hydraulic motor for driving the other crawler, a hydraulic motor for slewing a platform, a hydraulic cylinder for flexing and stretching the arm assembly, a cylinder for actuating a bucket and a cylinder for actuating a dozer are connected in parallel to one another to a second pump through a further multiplex valve assembly having a second center bypass. The invention provides a circuit to permit fluid pressure from the first pump to enter the circuit connected to the second pump to provide confluence therein, when the dozer actuating cylinder connected to the second pump, for example, is operated while the backhoe is running. When the motor and/or the cylinder connected to the first pump is (or are) at rest, the cylinders and motors connected to the second pump except the platform slewing motor are arranged to be accelerated.
REFERENCES:
patent: 3720059 (1973-03-01), Schurawski
patent: 3922855 (1975-12-01), Bridwell
patent: 4112821 (1978-09-01), Bianchetta
patent: 4179981 (1979-12-01), Yeou
patent: 4210061 (1980-07-01), Bianchetta
Hershkovitz Abraham
Kubota Ltd.
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