Hydraulic circuit for backhoe

Details Hydraulic circuit for backhoe Hydraulic circuit for backhoe

1989-05-05

1991-01-22

Wayner, William E.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60484, 60494, F16D 3102

Patent

active

049860755

ABSTRACT:
In a hydraulic circuit for a backhoe vehicle including a plurality of hydraulic pumps and operating valves for a pair of right and left vehicle-propelling devices and other work implements, two hydraulic circuits connected to the vehicle-propelling devices share a single unit of relief circuit adapted for selectively providing relief oil pressure in a plurality of steps. In a vehicle propelling operation or an excavating operation, the relief circuit provides a higher relief pressure to oil passages used in this operation than that provided for an all-pump-activated condition, hence, the engine output may be harnessed more efficiently.

REFERENCES:
patent: 4017221 (1977-04-01), Dezelan
patent: 4218886 (1980-08-01), White
patent: 4345436 (1982-08-01), Johnson
patent: 4467604 (1984-08-01), Forster
patent: 4531366 (1985-07-01), Moriya et al.

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