JPS5743002A - Automatic speed changeover valve for two-speed motor - Google Patents

Automatic speed changeover valve for two-speed motor

Info

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
Application number
JP11877280A
Other languages
Japanese (ja)
Other versions
JPS642803B2 (en
Inventor
Haruki Ubukata
Yoshio Hasegawa
Morio Komiya
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 JP11877280A priority Critical patent/JPS5743002A/en
Publication of JPS5743002A publication Critical patent/JPS5743002A/en
Publication of JPS642803B2 publication Critical patent/JPS642803B2/ja
Granted legal-status Critical Current

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
JP11877280A 1980-08-28 1980-08-28 Automatic speed changeover valve for two-speed motor Granted JPS5743002A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment

Cited By (4)

* Cited by examiner, † Cited by third party
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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