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

1999-10-26

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

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

60429, F16D 3102

Patent

active

059707097

ABSTRACT:
Pilot change-over valves for operating actuators are connected in a center bypassing form and a cut-off valve is disposed downstream of each such pilot change-over valves. Commands which are in a proportional relation to each other are outputted from a controller to a pilot port of the cut-off valve and a pilot port of a pilot change-over valve for boom. Both valves are closed synchronously. Operation commands for both valves can be altered with a volume control for setting operation characteristics. Hydraulic pump oils for arm are joined together by a confluent valve. Consequently, highly responsive operations can be attained in operating the attachment of a hydraulic excavator. This is effective in the ground hardening work with a bucket, the work for removing mud from the machine body and the work for scattering soil.

REFERENCES:
patent: 3270059 (1966-08-01), Schurawski et al.
patent: 3922855 (1975-12-01), Bridwell et al.
patent: 5046309 (1991-09-01), Yoshino
patent: 5083428 (1992-01-01), Kubomoto et al.
patent: 5277027 (1994-01-01), Aoyagi et al.

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