HYDRAULIC VALVE DEVICE

WIPO Patent Application WO/2024/009620

A1

A hydraulic valve device 1, in order to efficiently supply a greater amount of oil to a directional spool, operates spools provided in a valve body, thereby controlling supply of oil from hydraulic pumps to hydraulic equipment. A valve body 20 is provided with: two pump oil paths 21A, 21B connected to individual hydraulic pumps 9 via pump ports 22A, 22B; and a plurality of cylinder spools 33 provided individually corresponding to a plurality of hydraulic cylinders 11, 12. The pump oil paths 21A, 21B are provided in the valve body 20 so as to be lined parallel to each other along the same direction. The plurality of cylinder spools 33 are connected to sections of the pump oil paths 21A, 21B located to one side of the pump ports 22A, 22B. The pump oil paths 21A, 21B are connected to each other via a flow dividing/combining oil path 42 the end of which that is located to the one side of the pump ports 22A, 22B has a flow dividing/combining switching valve 44V.

JP5778086	Hydraulic circuit of construction machinery and its control device
JPH0784885	INDUSTRIAL APPLICABILITY [Title of Invention]
JPH0333562	TRAVEL GEAR SHIFTER FOR POWER SHOVEL

HISHINUMA YUICHI (JP)
MIYAMOTO YUUSUKE (JP)

PCT/JP2023/018337

January 11, 2024

May 16, 2023

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KOMATSU MFG CO LTD (JP)

F15B11/02

JPH04136511A	1992-05-11
JP2002181008A	2002-06-26
JP2018172860A	2018-11-08
JP2015040575A	2015-03-02
JP2013148175A	2013-08-01
JP2019183972A	2019-10-24
JP2009041711A	2009-02-26
JPH0643301U	1994-06-07
JP2571231Y2	1998-05-18
JP2004239427A	2004-08-26
JPS6294158U	1987-06-16
JPH04203033A	1992-07-23

SAKAI INTERNATIONAL PATENT OFFICE (JP)

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