JPS54105667A - Hydrulic pressure controller - Google Patents

Hydrulic pressure controller

Info

Publication number
JPS54105667A
JPS54105667A JP1148278A JP1148278A JPS54105667A JP S54105667 A JPS54105667 A JP S54105667A JP 1148278 A JP1148278 A JP 1148278A JP 1148278 A JP1148278 A JP 1148278A JP S54105667 A JPS54105667 A JP S54105667A
Authority
JP
Japan
Prior art keywords
valve
oil hydraulic
pump
servo
hydraulic fluid
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
JP1148278A
Other languages
Japanese (ja)
Other versions
JPS5916123B2 (en
Inventor
Takehisa Shio
Toshimichi Miura
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries 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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP53011482A priority Critical patent/JPS5916123B2/en
Publication of JPS54105667A publication Critical patent/JPS54105667A/en
Publication of JPS5916123B2 publication Critical patent/JPS5916123B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To permit supply of flow required for an operation apparatus using a servo valve with reduced power loss and heat generation by providing a small size second pump which can supply servo valve leakage flow even at the time of the low rmp engine operation.
CONSTITUTION: When a directional control valve 15 along is operated without using a servo-valve 9, a solenoid controlled valve 16 is not energized, and chambers 52 and 40 are communicated with a tank. Thus, oil hydraulic fluid discharged from a second pump 7 is unloades through a path 45, and oil hydraulic fluid from a fitst pump 6 enters a chamber 38 and pushed a spool 32 to the left so that it is supplied to an oil hydraulic circuit for ordinary work. When the servo-valve 9 is used, the solenoid controlled valve 16 is energized, and passages 55 and 64 are closed. As a result, oil hydraulic fluid from the second pump 7 is supplied from the chamber 38 to the servo-valve 9. When the quantity of the supplied fluid is small, the oil hydraulic pressure in the chamber 38 is reduced to cause rightward movement of the spool 32, whereby oil hydraulic fluid from a first pump 7 is replenished.
COPYRIGHT: (C)1979,JPO&Japio
JP53011482A 1978-02-06 1978-02-06 hydraulic control device Expired JPS5916123B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53011482A JPS5916123B2 (en) 1978-02-06 1978-02-06 hydraulic control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53011482A JPS5916123B2 (en) 1978-02-06 1978-02-06 hydraulic control device

Publications (2)

Publication Number Publication Date
JPS54105667A true JPS54105667A (en) 1979-08-18
JPS5916123B2 JPS5916123B2 (en) 1984-04-13

Family

ID=11779263

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53011482A Expired JPS5916123B2 (en) 1978-02-06 1978-02-06 hydraulic control device

Country Status (1)

Country Link
JP (1) JPS5916123B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6194327U (en) * 1984-11-27 1986-06-18

Also Published As

Publication number Publication date
JPS5916123B2 (en) 1984-04-13

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