JPS5743002A - Automatic speed changeover valve for two-speed motor - Google Patents
Automatic speed changeover valve for two-speed motorInfo
- Publication number
- JPS5743002A JPS5743002A JP11877280A JP11877280A JPS5743002A JP S5743002 A JPS5743002 A JP S5743002A JP 11877280 A JP11877280 A JP 11877280A JP 11877280 A JP11877280 A JP 11877280A JP S5743002 A JPS5743002 A JP S5743002A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- speed
- changeover
- changeover valve
- tapered portion
- 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 surely prevent hunting at the time of changeover by providing a tapered portion in a piston in a pressure chamber connected to a pilot valve.
CONSTITUTION: A piston 32 in a pressure chamber 35 is provided with a tapered portion 44 so that the pressure receiving area of the piston 32 is altered as it is moved toward or away from a seat 45. As a result, a main spool 31 can be displaced for changeover by the total stroke in an extremely short time and can thereafter be held at the stroke end even if there is a minute pressure fluctuation. For that reason, a main changeover valve is surely prevented from hunting.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11877280A JPS5743002A (en) | 1980-08-28 | 1980-08-28 | Automatic speed changeover valve for two-speed motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11877280A JPS5743002A (en) | 1980-08-28 | 1980-08-28 | Automatic speed changeover valve for two-speed motor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5743002A true JPS5743002A (en) | 1982-03-10 |
JPS642803B2 JPS642803B2 (en) | 1989-01-18 |
Family
ID=14744685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11877280A Granted JPS5743002A (en) | 1980-08-28 | 1980-08-28 | Automatic speed changeover valve for two-speed motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5743002A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6187203U (en) * | 1984-11-14 | 1986-06-07 | ||
US4712377A (en) * | 1984-09-17 | 1987-12-15 | Kabushiki Kaisha Komatsu Seisakusho | Control apparatus for hydraulic motor |
US6389809B1 (en) | 1999-06-10 | 2002-05-21 | Hitachi Construction Machinery Co., Ltd. | Volume control valve of variable displacement hydraulic rotating machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9724840B2 (en) | 1999-10-01 | 2017-08-08 | Sd3, Llc | Safety systems for power equipment |
-
1980
- 1980-08-28 JP JP11877280A patent/JPS5743002A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4712377A (en) * | 1984-09-17 | 1987-12-15 | Kabushiki Kaisha Komatsu Seisakusho | Control apparatus for hydraulic motor |
JPS6187203U (en) * | 1984-11-14 | 1986-06-07 | ||
JPH0346246Y2 (en) * | 1984-11-14 | 1991-09-30 | ||
US6389809B1 (en) | 1999-06-10 | 2002-05-21 | Hitachi Construction Machinery Co., Ltd. | Volume control valve of variable displacement hydraulic rotating machine |
Also Published As
Publication number | Publication date |
---|---|
JPS642803B2 (en) | 1989-01-18 |
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