JPS56143870A - Three-position change-over control valve - Google Patents
Three-position change-over control valveInfo
- Publication number
- JPS56143870A JPS56143870A JP4850280A JP4850280A JPS56143870A JP S56143870 A JPS56143870 A JP S56143870A JP 4850280 A JP4850280 A JP 4850280A JP 4850280 A JP4850280 A JP 4850280A JP S56143870 A JPS56143870 A JP S56143870A
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic chamber
- spool
- large diameter
- port
- pump port
- 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.)
- Granted
Links
Abstract
PURPOSE: To perform a high response and stable control operation by a method wherein a hydraulic chamber communicating with pump port and another hydraulic chamber communicating with a motor port are connected with each other with a small clearance, an under-lap part is formed at one end of the large diameter spool part to make a parallel stepped part having a smaller diameter that that of the large diameter part.
CONSTITUTION: Underlap part A is arranged at the end part of the pump port hydraulic chamber (a) in the large diameter part 12b of the spool 12 and a parallel stepped part is formed such that is has a diameter slightly smaller than the large diameter part 12b over a small range of l toward an axial center of the spool 12. Thereby, the underrap part A is connected with a pump port hydraulic chamber (a) through a small clearance (e) when it is overlapped with the cylinder port hydraulic chamber (c), a drain resistance is varied in response to a variation of the overlapped distance between the underlap part A and the hydraulic chamber (c), thereby both a feeding and a discharging of the hydraulic oil are performed from the hydraulic motor (not shown). Then, it is possible to provide a stability and high responsive control with a less shifting of the spool 12.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4850280A JPS56143870A (en) | 1980-04-11 | 1980-04-11 | Three-position change-over control valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4850280A JPS56143870A (en) | 1980-04-11 | 1980-04-11 | Three-position change-over control valve |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56143870A true JPS56143870A (en) | 1981-11-09 |
JPH0121387B2 JPH0121387B2 (en) | 1989-04-20 |
Family
ID=12805150
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4850280A Granted JPS56143870A (en) | 1980-04-11 | 1980-04-11 | Three-position change-over control valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56143870A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009063115A (en) * | 2007-09-07 | 2009-03-26 | Kayaba Ind Co Ltd | Fluid pressure controller |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55131617U (en) * | 1979-03-13 | 1980-09-18 |
-
1980
- 1980-04-11 JP JP4850280A patent/JPS56143870A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55131617U (en) * | 1979-03-13 | 1980-09-18 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009063115A (en) * | 2007-09-07 | 2009-03-26 | Kayaba Ind Co Ltd | Fluid pressure controller |
Also Published As
Publication number | Publication date |
---|---|
JPH0121387B2 (en) | 1989-04-20 |
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