HYDRAULIC SHOVEL DRIVE SYSTEM

WIPO Patent Application WO/2019/220954

A1

This hydraulic shovel drive system is provided with a first pump connected to a boom main control valve and an arm auxiliary control valve by means of a first pump line, a second pump connected to a boom auxiliary control valve and an arm main control valve by means of a second pump line, and a control device which does not operate the arm auxiliary control valve when an arm pulling operation is performed simultaneously with a boom raising operation, wherein the boom auxiliary control valve operates together with the boom main control valve when the boom raising operation is performed, and a non-return valve which allows a flow from the boom auxiliary control valve toward a head side of a boom cylinder but prohibits the reverse flow is provided in a boom raising second supply line connecting the boom auxiliary control valve to a boom raising first supply line between the boom main control valve and the boom cylinder.

JP7401530	Control device, wheel loader, and method
WO/2003/107235	INFORMATION PROVIDING SYSTEM OF CONSTRUCTION MACHINE AND INFORMATION PROVIDING METHOD OF CONSTRUCTION MACHINE
WO/2023/195578	SAFETY LOCK VALVE INCLUDING LOGIC VALVE CAPABLE OF PILOT PRESSURE SUPPLY CONTROL

KONDO AKIHIRO
MURAOKA HIDEYASU
IWABE KAZUYA

PCT/JP2019/018275

November 21, 2019

May 07, 2019

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KAWASAKI HEAVY IND LTD (JP)

E02F9/22; F15B11/02; F15B11/042; F15B11/08; F15B11/17

JP6220227B2	2017-10-25
JPH1072850A	1998-03-17

PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)

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