Title:
HYDRAULIC CIRCUIT FOR EXCAVATING SLEWING WORKING MACHINE
Document Type and Number:
Japanese Patent JP3681833
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To increase the speed of a boom and a working arm for improving operating efficiency without installing a separate hydraulic pump in an excavating slewing working machine with the working arm supplied with pressure oil by three hydraulic pumps and a hydraulic actuator for slewing a main body section.
SOLUTION: In the hydraulic circuit for the excavating slewing working machine, a boom cylinder is supplied with pressure oil from first and third pumps P1, P3, an arm cylinder from second and third pumps P2, P3, a bucket cylinder from the first pump P1, and a turning motor from the third pump P3 at the time of single drive. The arm is fed with pressure oil for increasing speed from the third pump P3 at the time of the simultaneous driving of both boom and arm cylinders, and the boom cylinder is supplied with a part of pressure oil from the third pump P3 to the tuning motor at the time of the simultaneous driving of the boom cylinder and the turning motor.
Inventors:
Masami Kondo
Application Number:
JP24788396A
Publication Date:
August 10, 2005
Filing Date:
September 19, 1996
Export Citation:
Assignee:
Yanmar Co., Ltd.
International Classes:
E02F9/22; F15B11/02; (IPC1-7): E02F9/22; F15B11/02
Domestic Patent References:
| JP60211522A | ||||
| JP56016736A | ||||
| JP57134007A | ||||
| JP7090885A | ||||
| JP7119705A |
Attorney, Agent or Firm:
Juichiro Yano