JPS55149401A - Control valve of work machine for agriculatural tractor - Google Patents

Control valve of work machine for agriculatural tractor

Info

Publication number
JPS55149401A
JPS55149401A JP5657479A JP5657479A JPS55149401A JP S55149401 A JPS55149401 A JP S55149401A JP 5657479 A JP5657479 A JP 5657479A JP 5657479 A JP5657479 A JP 5657479A JP S55149401 A JPS55149401 A JP S55149401A
Authority
JP
Japan
Prior art keywords
spool
cylinder
work machine
agriculatural
tractor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5657479A
Other languages
Japanese (ja)
Inventor
Hidekazu Nakazato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to JP5657479A priority Critical patent/JPS55149401A/en
Publication of JPS55149401A publication Critical patent/JPS55149401A/en
Pending legal-status Critical Current

Links

Landscapes

  • Lifting Devices For Agricultural Implements (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To make an operational force smaller as well as prevent giving a shock to a cylinder and a work machine by varying the supply quantity of working oil to the cylinder with movement of a spool in the spool change.
CONSTITUTION: On a spool 25 is formed a slit 27 which opens or closes main passages 4 and 5, in parallel to which branch passages 12 and 13 are provided, and an orifice 14 is provided in the branch passages 12 and 13. A pilot piston 36 for opening or closing a check valve 3 is further inserted free to slide, facing the check valve 3, to make the pressure generated before and after the orifice 14 to work behind the piston 36. It is possible to prevent a sudden shock from being generated since in this method working oil is supplied by stages to a cylinder 9 when the spool 25 has been changed.
COPYRIGHT: (C)1980,JPO&Japio
JP5657479A 1979-05-09 1979-05-09 Control valve of work machine for agriculatural tractor Pending JPS55149401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5657479A JPS55149401A (en) 1979-05-09 1979-05-09 Control valve of work machine for agriculatural tractor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5657479A JPS55149401A (en) 1979-05-09 1979-05-09 Control valve of work machine for agriculatural tractor

Publications (1)

Publication Number Publication Date
JPS55149401A true JPS55149401A (en) 1980-11-20

Family

ID=13030913

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5657479A Pending JPS55149401A (en) 1979-05-09 1979-05-09 Control valve of work machine for agriculatural tractor

Country Status (1)

Country Link
JP (1) JPS55149401A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57198404U (en) * 1981-06-11 1982-12-16
JPS5820709U (en) * 1981-07-31 1983-02-08 株式会社クボタ Valve structure in agricultural tractors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57198404U (en) * 1981-06-11 1982-12-16
JPS5820709U (en) * 1981-07-31 1983-02-08 株式会社クボタ Valve structure in agricultural tractors

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