HYDRAULIC CIRCUIT FOR TURNING EXCAVATOR

Title:

HYDRAULIC CIRCUIT FOR TURNING EXCAVATOR

Document Type and Number:

WIPO Patent Application WO/1998/012391

Kind Code:

A1

Abstract:

A hydraulic circuit which, when applied to a turning excavator having hydraulic actuators for the working arms and the turning excavator body supplied with pressure oil from three pumps, can increase the operation speed of the booms and arms without providing a separate hydraulic pump to improve the work efficiency. During the individual driving, the boom cylinder (CY1) is supplied with a pressure oil from the first and third pumps (P1, P3), the arm cylinder (CY2) from the second and third pumps (P2, P3), the bucket cylinder (CY3) from the first pump (P1), and the turning motor (M) from the thrid pump (P3). During the simultaneous driving of the boom and arm cylinders (CY1, CY2), the arm is supplied with an operation speed increasing pressure oil from the third pump (P3). When the boom cylinder (CY1) and the turning motor (M) are simultaneously operated, a part of the pressure oil to the turning motor (M) from the third pump (P3) is supplied to the boom cylinder (CY2).

Inventors:

KONDO MASAMI (JP)

Application Number:

PCT/JP1997/003288

Publication Date:

March 26, 1998

Filing Date:

September 18, 1997

Export Citation:

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Assignee:

YANMAR DIESEL ENGINE CO (JP)
KONDO MASAMI (JP)

International Classes:

E02F9/22; F15B11/02; (IPC1-7): E02F9/22

Foreign References:

JPS5815262U	1983-01-31
JPS57134007A	1982-08-19
JPH04107501U	1992-09-17
JPS5614607A	1981-02-12
JPS6490325A	1989-04-06
JPH08113961A	1996-05-07
JPS6330452B2	1988-06-17

Other References: