Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
HYDRAULIC CIRCUIT OF SINGLE-ACTING TYPE HYDRAULIC CYLINDER
Document Type and Number:
Japanese Patent JPH04157204
Kind Code:
A
Abstract:

PURPOSE: To facilitate expansion and contraction of a hydraulic cylinder and keep internal pressure for a long time by providing a pilot valve between a control valve and the hydraulic cylinder, switching the control valve to supply hydraulic fluid to the hydraulic cylinder, supplying pilot pressure to the pilot valve to return the hydraulic fluid.

CONSTITUTION: Hydraulic fluid is supplied to a hydraulic cylinder 23 from a control valve 30 at the first position of a pilot valve 31 which is provided between the hydraulic cylinder 23 with a spring 26 and the control valve 30 through fluid passages 36, 37. Besides, the hydraulic fluid is introduced at the second switching position from a fluid passage 48 as pilot pressure of the pilot valve 31, and the spool 42 of a valve body 39 is pushed to the release side through a pilot valve body 45 and a piston 46. It is thus possible to adjust expansion and contraction of the hydraulic cylinder 23 easily and keep internal pressure of the hydraulic cylinder 23 for a long time by switching the control valve 30.


Inventors:
SHIMIZU YOSABURO
ONBE MITSUHIKO
Application Number:
JP28289290A
Publication Date:
May 29, 1992
Filing Date:
October 20, 1990
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
KUBOTA KK
International Classes:
F15B11/08; (IPC1-7): F15B11/08
Domestic Patent References:
JPS5922323U1984-02-10
Attorney, Agent or Firm:
Toshio Yasuda