Title:
FLUID PRESSURE CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2019148301
Kind Code:
A
Abstract:
To prevent an actuator such as a cylinder from operating abruptly in a case where oil leakage occurs due to rupture of a hose or the like.SOLUTION: A hydraulic control device is a fluid pressure control device that controls the operation of a cylinder 2 for driving a boom 1, and comprises: a control valve 160 configured to control the flow of hydraulic oil from a pump 4 to the cylinder 2; a second main passage 8 on which a load pressure from the boom 1 acts when the control valve 160 is in a neutral position (N); a first main passage 7 where the load pressure does not act when the control valve 160 is in the neutral position (N); and a flow passage restriction device 130 configured to detect a pressure of the second main passage 8, and when the detected pressure falls below a predetermined pressure P0, reduce the opening area of the second main passage 8.SELECTED DRAWING: Figure 1
Inventors:
MATSUZAKI KEIICHI
KOIKE FUMIAKI
FUKUSHIMA AKIRA
OHIGATA SHIGERU
KOZU HIDETOSHI
KOIKE FUMIAKI
FUKUSHIMA AKIRA
OHIGATA SHIGERU
KOZU HIDETOSHI
Application Number:
JP2018033476A
Publication Date:
September 05, 2019
Filing Date:
February 27, 2018
Export Citation:
Assignee:
KYB YS CO LTD
NAGANO KOGYO KK
NAGANO KOGYO KK
International Classes:
F15B20/00; B66C13/20; F15B11/028; F15B11/08
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Attorney, Agent or Firm:
Goto Patent Office