JPS56143870A - Three-position change-over control valve - Google Patents

Three-position change-over control valve

Info

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
Application number
JP4850280A
Other languages
Japanese (ja)
Other versions
JPH0121387B2 (en
Inventor
Masayuki Harada
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP4850280A priority Critical patent/JPS56143870A/en
Publication of JPS56143870A publication Critical patent/JPS56143870A/en
Publication of JPH0121387B2 publication Critical patent/JPH0121387B2/ja
Granted legal-status Critical Current

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
JP4850280A 1980-04-11 1980-04-11 Three-position change-over control valve Granted JPS56143870A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55131617U (en) * 1979-03-13 1980-09-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55131617U (en) * 1979-03-13 1980-09-18

Cited By (1)

* Cited by examiner, † Cited by third party
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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