HYDRAULIC CYLINDER CIRCUIT - KOBELCO CONSTR MACHINERY LTD

Title:

HYDRAULIC CYLINDER CIRCUIT

Document Type and Number:

WIPO Patent Application WO/2002/004820

Kind Code:

A1

Abstract:

A hydraulic cylinder circuit capable of operating a one side rod type hydraulic cylinder to an extension side and a retraction side at a same speed by a hybrid system driving a pump by a motor and simplifying a circuit configuration, characterized in that pressurized fluid is supplied to and discharged from both the head side and rod side pressure chambers (4a, 4b) of the one side rod type hydraulic cylinder (4) by both first and second hydraulic pumps (2, 3) driven by the motor (1) at a flow rate in correspondence with the cross sectional ratio of both side pressure chambers (4a, 4b), whereby the hydraulic cylinder (4) can be operated to the extension and retraction sides at the same speed.

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Inventors:

YOSHIMATSU HIDEAKI (JP)
SAOTOME YOSHIMI (JP)

Application Number:

PCT/JP2001/005828

Publication Date:

January 17, 2002

Filing Date:

July 05, 2001

Export Citation:

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Assignee:

KOBELCO CONSTR MACHINERY LTD (JP)
YOSHIMATSU HIDEAKI (JP)
SAOTOME YOSHIMI (JP)

International Classes:

F15B7/00; (IPC1-7): F15B11/02; F15B11/08

Foreign References:

JPH11117907A	1999-04-27
JPH07127606A	1995-05-16
JPH0719203A	1995-01-20
JP2001214903A	2001-08-10
JP2001090704A	2001-04-03
JPS4844676A	1973-06-27
JPS624903A	1987-01-10
JPS58102806A	1983-06-18
US4464898A	1984-08-14
JPS6081502A	1985-05-09
JP2001241403A	2001-09-07

Attorney, Agent or Firm:

Kotani, Etsuji (2-2 Nakanoshima 2-chom, Kita-ku Osaka-shi Osaka, JP)

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