JPS57107403A - Hydraulic control unit - Google Patents

Hydraulic control unit

Info

Publication number
JPS57107403A
JPS57107403A JP18326880A JP18326880A JPS57107403A JP S57107403 A JPS57107403 A JP S57107403A JP 18326880 A JP18326880 A JP 18326880A JP 18326880 A JP18326880 A JP 18326880A JP S57107403 A JPS57107403 A JP S57107403A
Authority
JP
Japan
Prior art keywords
valve
pressure
discharge quantity
flow rate
pump
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
JP18326880A
Other languages
Japanese (ja)
Other versions
JPS59725B2 (en
Inventor
Yoshisuke Akita
Kenichi Akimoto
Hiroshi Kondo
Kenichi Aeba
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.)
Tokyo Keiki Inc
Original Assignee
Tokyo Keiki 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 Tokyo Keiki Co Ltd filed Critical Tokyo Keiki Co Ltd
Priority to JP18326880A priority Critical patent/JPS59725B2/en
Publication of JPS57107403A publication Critical patent/JPS57107403A/en
Publication of JPS59725B2 publication Critical patent/JPS59725B2/en
Expired legal-status Critical Current

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  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To improve control response by fixing the discharge quantity of a variable- discharge quantity pump when the quantity is less than a predetermined quantity, and by taking out pilot pressure of a pressure control pilot spool valve from the secondary side of a sequency valve.
CONSTITUTION: A control unit is disposed on a variable-discharge quantity pump 13, a flow rate control valve 14, and the secondary side of the valve 14, and is provided with a sequence valve 16 for biasing the pressure of the primary main pipe line at a high value for a predetermined value, a flow rate control pilot spool valve 17, a remote control relief valve 20, a pressure adjusting pilot spool valve 18, a pressure compensation valve 22 and a pressure valve 21 for exhausting surplus oil produced when a hydraulic actuator stops, which is disposed on the secondary side of the sequence valve 16. Oil pressure for controlling the discharge quantity of the variable-discharge quantity pump 13 is directly supplied not through a throttle to heighten the response of flow rate control, and the variable-discharge quantity pump 13 is adapted to function as a fixed-discharge quantity pump in case of less than a predetermined flow rate so as to assure a low-speed operation of a cylinder. Pump pressure is kept at more than a fixed value by the sequence valve 16 to heighten the flow rate response at the time of low load.
COPYRIGHT: (C)1982,JPO&Japio
JP18326880A 1980-12-24 1980-12-24 hydraulic control device Expired JPS59725B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18326880A JPS59725B2 (en) 1980-12-24 1980-12-24 hydraulic control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18326880A JPS59725B2 (en) 1980-12-24 1980-12-24 hydraulic control device

Publications (2)

Publication Number Publication Date
JPS57107403A true JPS57107403A (en) 1982-07-03
JPS59725B2 JPS59725B2 (en) 1984-01-09

Family

ID=16132684

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18326880A Expired JPS59725B2 (en) 1980-12-24 1980-12-24 hydraulic control device

Country Status (1)

Country Link
JP (1) JPS59725B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5948385A (en) * 1982-09-08 1984-03-19 日本スピンドル製造株式会社 Controller for hydraulic crane
CN103498493A (en) * 2013-09-11 2014-01-08 广西玉柴重工有限公司 Positive control pressure compensation system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5948385A (en) * 1982-09-08 1984-03-19 日本スピンドル製造株式会社 Controller for hydraulic crane
JPH0114445B2 (en) * 1982-09-08 1989-03-13 Nippon Spindle Mfg Co Ltd
CN103498493A (en) * 2013-09-11 2014-01-08 广西玉柴重工有限公司 Positive control pressure compensation system

Also Published As

Publication number Publication date
JPS59725B2 (en) 1984-01-09

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