Title:
FLUID PRESSURE CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/176685
Kind Code:
A1
Abstract:
A load retention mechanism (20) has a switching valve (22) for switching the operation of an operation check valve (21). The switching valve (22) has a piston (50) that, upon reception of pilot pressure, imparts thrust to a spool (56); and a gas releasing valve (80) that is provided to the piston (50) and that discharges gas from the pilot chamber (23) to a drain side. The gas releasing valve (80) has a valve body (82) for opening/closing a passage (81). The valve body (82) comes into contact with a first sheet part (81b) by a biasing force of a biasing member (83) and blocks the passage (81) during stoppage of a pilot pressure supply source (5), and moves against the biasing force of the biasing member (83) to be separated from the first sheet part (81b) and allows a fluid to flow from the pilot chamber (23) to a drain chamber (51) while the pilot pressure supply source (5) is driving and when the pilot pressure of the pilot chamber (23) is less than a prescribed pressure level which is lower than the pilot pressure for moving the spool (56).
Inventors:
KUBO SHUNSUKE (JP)
Application Number:
PCT/JP2023/009044
Publication Date:
September 21, 2023
Filing Date:
March 09, 2023
Export Citation:
Assignee:
KYB CORP (JP)
International Classes:
F15B11/08
Foreign References:
| JP2019027504A | 2019-02-21 | |||
| JP2002317802A | 2002-10-31 | |||
| JPH05187416A | 1993-07-27 |
Attorney, Agent or Firm:
GOTOH & PARTNERS (JP)
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