Title:
HYDRAULIC VALVE AND HYDRAULIC CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2023/218802
Kind Code:
A1
Abstract:
In order to implement fine flow rate control while maintaining rigidity of a spool, the present invention provides a flow rate control valve 40 that performs control of the flow rate of oil reaching a drain port 42 via a main passage 63 from a meter-out port 41 by changing the surface area of an opening in a meter-out passage 63f relative to the meter-out port 41 in conjunction with the movement of a spool 62. The main passage 63 of the spool 62 includes: a meter-out region 63b where the meter-out passage 63f is provided; a drain region 63d where a drain passage 63g is provided; and a tapered region 63c that is continuous between the meter-out region 63b and the drain region 63d. The inner diameter of the meter-out region 63b is formed larger than the drain region 63d. The tapered region 63c is constituted in a tapered shape the inner diameter of which gradually decreases toward the drain region 63d.
Inventors:
IKEDA MASATOSHI (JP)
SUMINO WATARU (JP)
AKAMATSU TAKASHI (JP)
SUMINO WATARU (JP)
AKAMATSU TAKASHI (JP)
Application Number:
PCT/JP2023/013977
Publication Date:
November 16, 2023
Filing Date:
April 04, 2023
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
International Classes:
F16K3/26; F16K11/07
Foreign References:
| JPH09159036A | 1997-06-17 | |||
| JP2002181004A | 2002-06-26 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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