Title:
HYDRAULIC CONTROL CIRCUIT FOR CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP3491600
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a hydraulic control circuit for a construction machine capable of operating turn and arm pulling properly and simultaneously.
SOLUTION: This hydraulic control circuit has a plurality of actuators including a turning motor 9a and an arm cylinder 19, a plurality of hydraulic pumps 2, 3, a plurality of control valves including both control valves 9, 10 for turning motor and arm cylinder controlling supply and discharge of oil between each hydraulic pump and each actuator, and a selector valve 11 switching between (a) position where oil from a plurality of hydraulic pumps 2, 3 is separately supplied for both control valves 9, 10 for turning motor and arm cylinder and (b) position where oil from a plurality of hydraulic pumps is joined and supplied. It is provided with a controller 17 switching the selector valve 11 to the (b) position when turning and arm pulling are done and a meter-in throttle valve 16 restricting an amount of oil to be supplied to an arm cylinder 19 when the selector valve 11 is switched to the (b) position.
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Inventors:
Hiroshi Taji
Application Number:
JP2000112340A
Publication Date:
January 26, 2004
Filing Date:
April 13, 2000
Export Citation:
Assignee:
Kobelco Construction Machinery Co., Ltd.
International Classes:
E02F9/22; F15B11/17; (IPC1-7): F15B11/17; E02F9/22
Domestic Patent References:
| JP20002204A | ||||
| JP11218102A |
Attorney, Agent or Firm:
Etsushi Kotani (2 outside)
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