Hydraulic control circuit in a hydraulic excavator

Details Hydraulic control circuit in a hydraulic excavator Hydraulic control circuit in a hydraulic excavator

1997-09-30

1999-12-07

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60429, 91444, 91513, F16D 3102

Patent

active

059963417

ABSTRACT:
A cut-off valve is mounted so that it can open and close an oil passage which leads a pressure oil discharged from a first pump into a hydraulic oil tank in a neutral state of a spool valve for boom. When an operating lever for boom and an operating lever for arm have simultaneously been operated to a boom raising side and an arm pulling side, respectively, the cut-off valve is closed in proportion to a boom raising or arm pulling pilot pressure. The cut-off valve is controlled using as a parameter a differential pressure between the arm pulling pilot pressure and the boom raising pilot pressure. By doing so, there is obtained a low gain operability in the crane work, while in the parallel pulling work there is obtained an operability of a relatively high gain which matches a quick motion of the arm.

REFERENCES:
patent: 4030623 (1977-06-01), Bridwell et al.
patent: 5083428 (1992-01-01), Kubomoto et al.
patent: 5277027 (1994-01-01), Aoyagi et al.

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