HYDRAULIC SYSTEM - KAWASAKI HEAVY IND LTD

Title:

HYDRAULIC SYSTEM

Document Type and Number:

WIPO Patent Application WO/2019/065509

Kind Code:

A1

Abstract:

This hydraulic system for a closed circuit is provided with: a pump driven by a rotary machine; a rod-side supply line for connecting a first port of the pump to the rod-side chamber of a hydraulic cylinder; a head-side supply line for connecting a second port of the pump to the head-side chamber of the hydraulic cylinder; a check valve provided in a first tank line which branches from the rod-side supply line and connects to a tank; and a head-side counterbalance valve provided to a second tank line which branches from the head-side supply line and connects to the tank. The head-side counterbalance valve is configured so that, when a head-side reference pressure which is based on pressure in the rod-side supply line and on pressure in the head-side supply line is higher than a set pressure, the head-side counterbalance valve permits a flow from the head-side supply line to the tank.

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Inventors:

TOYOTA TOSHIHISA
MITSUI HIROAKI
KONDO AKIHIRO
KUNISHIRO TAKAAKI

Application Number:

PCT/JP2018/035100

Publication Date:

April 04, 2019

Filing Date:

September 21, 2018

Export Citation:

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Assignee:

KAWASAKI HEAVY IND LTD (JP)

International Classes:

F15B11/00; F15B11/08

Foreign References:

JPH10166199A	1998-06-23
JP2004257448A	2004-09-16
JP3833291B2	2006-10-11

Other References: