JPS55149401A - Control valve of work machine for agriculatural tractor - Google Patents
Control valve of work machine for agriculatural tractorInfo
- 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
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
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)
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 |
-
1979
- 1979-05-09 JP JP5657479A patent/JPS55149401A/en active Pending
Cited By (2)
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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