WORK MACHINE HYDRAULIC ENERGY REUSING DEVICE - HITACHI CONSTRUCTION MACH CO

Title:

WORK MACHINE HYDRAULIC ENERGY REUSING DEVICE

Document Type and Number:

WIPO Patent Application WO/2016/194415

Kind Code:

A1

Abstract:

Provided is a work machine hydraulic energy reusing device with which brake pressure can be reliably maintained even when an electrical failure occurs in an electromagnetic valve, etc. and opening operation is erroneously initiated. The work machine hydraulic energy reusing device, which is provided with a first hydraulic actuator, a second hydraulic actuator, and a first hydraulic pump for supplying hydraulic fluid to the first hydraulic actuator via a first oil passage, is equipped with: an upper control valve, which is connected to the discharge side of the second hydraulic actuator from which hydraulic fluid is discharged when the object driven by the second hydraulic actuator is dropping under its own weight and which can adjust the flow rate of the hydraulic fluid discharged from the second hydraulic actuator; a connecting oil passage connecting the upper control valve and a hydraulic fluid tank; a lower control valve provided in the connecting oil passage and capable of adjusting the flow rate of hydraulic fluid discharged from the upper control valve toward the hydraulic fluid tank; and a reuse oil passage, one end of which is connected to a branch point of the connecting oil passage between the upper control valve and the lower control valve and the other end of which is connected to the first oil passage.

Inventors:

HIJIKATA SEIJI (JP)
ISHIKAWA KOUJI (JP)
IMURA SHINYA (JP)

Application Number:

PCT/JP2016/055305

Publication Date:

December 08, 2016

Filing Date:

February 23, 2016

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACH CO (JP)

International Classes:

E02F9/22; F15B21/14; F15B11/00; F15B11/08; F15B11/16; F15B20/00

Foreign References:

JPS6324402U

1988-02-18

Other References: