Title:
CONTROL CIRCUIT OF CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP3244257
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To secure a sufficient operational responsiveness in both attachment and movable actuation part and improve the operational responsiveness when both are simultaneously operated.
SOLUTION: This control circuit is provided with a main fluid hydraulic circuit 101 with the first hydraulic pump 1A operating actuators 34, 65 for driving an attachment and a movable actuation part, the second hydraulic pump 1B operating an actuator for driving a construction machine, control valves 12, 13, and a control valve for the construction machine, hydraulic circuits 107 108 of the pilot fluid for the construction machine, and an auxiliary fluid hydraulic circuit 104 supplying the hydraulic oil from the second hydraulic pump 1B to the actuators 34, 65. And further, the circuit is provided with a control structure 46 to control the supply condition of the hydraulic oil from the second hydraulic pump 1B to the control valve side for the attachment and/or to the control valve side for the movable actuation part, and an auxiliary control valve 11 so as to be controlled to supply the hydraulic fluid from the second hydraulic pump 1B to the auxiliary hydraulic pressure circuit side.
Inventors:
Yorimichi Kubota
Keisuke Yamamoto
Tadaharu Iida
Yasuhiro Kubo
Keisuke Yamamoto
Tadaharu Iida
Yasuhiro Kubo
Application Number:
JP21149096A
Publication Date:
January 07, 2002
Filing Date:
August 09, 1996
Export Citation:
Assignee:
New Caterpillar Mitsubishi Corporation
International Classes:
E02F9/20; E02F9/22; F15B11/16; (IPC1-7): E02F9/22; F15B11/16
Domestic Patent References:
| JP60144432A | ||||
| JP35531A | ||||
| JP5280071A | ||||
| JP581361U | ||||
| JP5029007U |
Attorney, Agent or Firm:
Yu Sanada