JPS5791388A - Ejection quantity controller for hydraulic pump - Google Patents

Ejection quantity controller for hydraulic pump

Info

Publication number
JPS5791388A
JPS5791388A JP55167792A JP16779280A JPS5791388A JP S5791388 A JPS5791388 A JP S5791388A JP 55167792 A JP55167792 A JP 55167792A JP 16779280 A JP16779280 A JP 16779280A JP S5791388 A JPS5791388 A JP S5791388A
Authority
JP
Japan
Prior art keywords
piston
control valve
face
effective volume
value
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
JP55167792A
Other languages
Japanese (ja)
Other versions
JPS63632B2 (en
Inventor
Takeshi Yamaguchi
Sotaro Tanaka
Yasuo Sakaki
Takashi Yagyu
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 JP55167792A priority Critical patent/JPS5791388A/en
Publication of JPS5791388A publication Critical patent/JPS5791388A/en
Publication of JPS63632B2 publication Critical patent/JPS63632B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE: To aim at reducing driving torque by disposing two pistons into a cylinder in a regulator and by selectively supplying pressure fluid into a cylinder chamber so that a minimum displacement of one piston can be set by the displacement of the other piston.
CONSTITUTION: When a directional control valve 14 is in the position of A, pressure fluid discharged from a hydraulic pump 12 is supplied into a cylinder chamber 11 so that a piston 9 is pushed leftward with its end face 9a being projected into a pressure chamber 7. Therefore, when pilot pressure acting to the pressure chamber 7 is lower than a predetermined value, a piston 5 abuts against the end face 9a of the piston 9 under the bias force of a spring 6, thereby the minimum value of the effective volume takes a value of 1/4W1/5 of the maximum value thereof. When the directional control valve 14 is changed to the position of B, the cylinder chamber 11 is communicated with a tank 13, causing the piston 5 to abut against an end face 4c of a casing 4 under the bias force of spring 6, thereby the effective volume becomes almost zero. Thus, the minimum value of the effective volume can easily be set by controlling the directionaly control valve 14, thereby to reduce driving torque.
COPYRIGHT: (C)1982,JPO&Japio
JP55167792A 1980-11-28 1980-11-28 Ejection quantity controller for hydraulic pump Granted JPS5791388A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55167792A JPS5791388A (en) 1980-11-28 1980-11-28 Ejection quantity controller for hydraulic pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55167792A JPS5791388A (en) 1980-11-28 1980-11-28 Ejection quantity controller for hydraulic pump

Publications (2)

Publication Number Publication Date
JPS5791388A true JPS5791388A (en) 1982-06-07
JPS63632B2 JPS63632B2 (en) 1988-01-07

Family

ID=15856188

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55167792A Granted JPS5791388A (en) 1980-11-28 1980-11-28 Ejection quantity controller for hydraulic pump

Country Status (1)

Country Link
JP (1) JPS5791388A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009138572A (en) * 2007-12-04 2009-06-25 Tokyo Keiki Inc Dual capacity pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009138572A (en) * 2007-12-04 2009-06-25 Tokyo Keiki Inc Dual capacity pump

Also Published As

Publication number Publication date
JPS63632B2 (en) 1988-01-07

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