JPS57110860A - Controller of oil hydraulic system - Google Patents

Controller of oil hydraulic system

Info

Publication number
JPS57110860A
JPS57110860A JP18713580A JP18713580A JPS57110860A JP S57110860 A JPS57110860 A JP S57110860A JP 18713580 A JP18713580 A JP 18713580A JP 18713580 A JP18713580 A JP 18713580A JP S57110860 A JPS57110860 A JP S57110860A
Authority
JP
Japan
Prior art keywords
valve
pressure
brake device
pipe line
flow
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.)
Pending
Application number
JP18713580A
Other languages
Japanese (ja)
Inventor
Eiki Izumi
Takeshi Yamaguchi
Sotaro Tanaka
Yukio Aoyanagi
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery 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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP18713580A priority Critical patent/JPS57110860A/en
Publication of JPS57110860A publication Critical patent/JPS57110860A/en
Pending legal-status Critical Current

Links

Landscapes

  • Fluid-Pressure Circuits (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

PURPOSE: To automatically operate motor stopping means, by providing means for detecting presence of a flow of pressure oil in an main pipe line through a throttle valve and operating the motor stopping means when absence of the flow is detected.
CONSTITUTION: In case of returning a control lever of a pilot valve 8 to a neutral position, a pipe line to a brake device 20 is communicated to a tank by a selector valve 14. However, at this time, suction side pressure of an oil hydraulic pump 1 rapidly rises to operate a control valve 11, then a servo valve 10 can not be reset immediately to its neutral state and remains in a selecting state. Here a flow in a main pipe line causes a pressure difference before and after a throttle valve 19, and a selector valve 15 is selected, then pressure oil of an oil hydraulic pressure source 17 is guided to the brake device 20 to release its operation, when a motor 2 substantially becomes a stopping state, the pressure difference before and after the throttle valve 19 is lost, then a selector valve 15 is returned to the neutral, thus the brake device 20 can be operated.
COPYRIGHT: (C)1982,JPO&Japio
JP18713580A 1980-12-27 1980-12-27 Controller of oil hydraulic system Pending JPS57110860A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18713580A JPS57110860A (en) 1980-12-27 1980-12-27 Controller of oil hydraulic system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18713580A JPS57110860A (en) 1980-12-27 1980-12-27 Controller of oil hydraulic system

Publications (1)

Publication Number Publication Date
JPS57110860A true JPS57110860A (en) 1982-07-09

Family

ID=16200730

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18713580A Pending JPS57110860A (en) 1980-12-27 1980-12-27 Controller of oil hydraulic system

Country Status (1)

Country Link
JP (1) JPS57110860A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341722A (en) * 1991-08-12 1994-08-30 Daikin Industries, Ltd. Positioning apparatus used for machine tools etc.
US6050091A (en) * 1996-03-27 2000-04-18 Komatsu Ltd. Brake device for oil hydraulic motor
JP2011241952A (en) * 2010-05-20 2011-12-01 Komatsu Ltd Control device for electric actuator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341722A (en) * 1991-08-12 1994-08-30 Daikin Industries, Ltd. Positioning apparatus used for machine tools etc.
US6050091A (en) * 1996-03-27 2000-04-18 Komatsu Ltd. Brake device for oil hydraulic motor
JP2011241952A (en) * 2010-05-20 2011-12-01 Komatsu Ltd Control device for electric actuator
US9617713B2 (en) 2010-05-20 2017-04-11 Komatsu Ltd. Control device for an electric actuator

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