Title:
MULTI-CONTROL VALVE UNIT, AND HYDRAULIC DRIVE DEVICE FOR HYDRAULIC EXCAVATOR
Document Type and Number:
WIPO Patent Application WO/2020/059628
Kind Code:
A1
Abstract:
Provided are a multi-control valve unit having a simple hydraulic oil flow passage configuration, and a hydraulic drive device for a hydraulic excavator. In this multi-control valve unit, a pilot chamber forming member, provided internally with a first pilot chamber which guides a first pilot pressure for controlling a first spool, and a second pilot chamber which guides a second pilot pressure for controlling a second spool, is attached to a housing, and an electromagnetic proportional pressure reducing valve capable of controlling the first pilot pressure and the second pilot pressure is provided in the pilot chamber forming member.
Inventors:
KONDO AKIHIRO
HATA NAOKI
HATA NAOKI
Application Number:
PCT/JP2019/035861
Publication Date:
March 26, 2020
Filing Date:
September 12, 2019
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/00; E02F9/22; F15B11/08; F16K27/04
Domestic Patent References:
| WO2018021288A1 | 2018-02-01 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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