Hydraulic circuit for construction machine

Details Hydraulic circuit for construction machine Hydraulic circuit for construction machine

2005-09-21

2009-12-22

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Pilot valve

C060S494000

Reexamination Certificate

active

07634961

ABSTRACT:
A hydraulic circuit including a first throttle disposed upstream of pressure-reducing valves of a remote-control valve, which operates a control valve of hydraulic pilot type, so as to reduce primary pressures supplied from a pilot pump to the pressure-reducing valves. Bleed-off lines connect pilot lines to tanks. Second throttles are disposed on the bleed-off lines, respectively, so as to moderate rises in the pilot pressures supplied to pilot ports of the control valve. The hydraulic circuit prevents detrimental effects such as deterioration of operability while ensuring shock absorption during quick operation.

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U.S. Appl. No. 12/399,813, filed Dec. 19, 2008, Saotome, et al.

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