Hydraulic circuit for a backhoe

Details Hydraulic circuit for a backhoe Hydraulic circuit for a backhoe

1988-11-07

1990-10-09

Price, Carl D.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

With means to control the working fluid to one working...

414687, E02F 332, F15B 1309

Patent

active

049613715

ABSTRACT:
A hydraulic circuit for a backhoe comprising a first multiple valve, a second multiple valve, and a confluence mechanism mounted between the first and second multiple valves. The first multiple valve includes control valves connected to a first pump in parallel to one another for driving working implements. The second multiple valve includes further control valves connected to a second pump in parallel to one another for driving other working implements. The confluence mechanism is connected to a rear end of a center bypass line of the first multiple valve and to a rear end of a center bypass line of the second multiple valve. Further, the confluence mechanism, in neutral position, is connected to a return oil line for confluently returning oil from the first and second multiple valves to a tank.

REFERENCES:
patent: 4171054 (1979-10-01), Tanaka et al.
patent: 4207740 (1980-06-01), Ripa
patent: 4528892 (1985-07-01), Okabe et al.
patent: 4561341 (1985-12-01), Aikawa
patent: 4561824 (1985-12-01), Okabe et al.
patent: 4614475 (1986-09-01), Tamura et al.

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