CONSTRUCTION APPARATUS - HITACHI CONSTRUCTION MACH CO

Title:

CONSTRUCTION APPARATUS

Document Type and Number:

WIPO Patent Application WO/2016/147283

Kind Code:

A1

Abstract:

A construction apparatus (1) provided with a control valve (2) for switching the supply of pressurized oil coming from a hydraulic pump (6) to a hydraulic actuator (3a), a control valve drive device (5) for supplying pilot secondary pressurized oil to the control valve (2) in accordance with the operation of an operating lever device (4), a pilot hydraulic pump (7) for supplying pilot primary pressurized oil to the control valve drive device (5), and a pressure storage device (11) for recovering returning pressurized oil from the hydraulic actuator (3a), the apparatus being further provided with a check valve (13) provided in an oil channel between the pilot hydraulic pump (7) and the control valve drive device (5), a pressure reduction valve (15) for supplying pressurized oil stored in the pressure storage device (11) to an oil channel between the check valve (13) and the control valve drive device (5), a flow rate reduction device (14) capable of reducing the flow rate of oil discharged from the pilot oil-pressure pump (7), and a control device (100) for controlling the flow rate reduction device (14) in accordance with the pressure in the oil channel between the check valve (13) and the control valve drive device (5).

Inventors:

HIJIKATA SEIJI (JP)
ISHIKAWA KOUJI (JP)
TSURUGA YASUTAKA (JP)
HOSHINO MASATOSHI (JP)
TAKAHASHI KIWAMU (JP)

Application Number:

PCT/JP2015/057629

Publication Date:

September 22, 2016

Filing Date:

March 16, 2015

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACH CO (JP)

International Classes:

F15B21/14; F15B11/08

Foreign References:

JP2009250361A	2009-10-29
JP2014227949A	2014-12-08
JP2009150413A	2009-07-09

Other References: