EP0821163A4 - Apparatus for controlling swash-plate pump and motor - Google Patents

Apparatus for controlling swash-plate pump and motor

Info

Publication number
EP0821163A4
EP0821163A4 EP96909350A EP96909350A EP0821163A4 EP 0821163 A4 EP0821163 A4 EP 0821163A4 EP 96909350 A EP96909350 A EP 96909350A EP 96909350 A EP96909350 A EP 96909350A EP 0821163 A4 EP0821163 A4 EP 0821163A4
Authority
EP
European Patent Office
Prior art keywords
piston
spool
port
communicating
swash
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.)
Withdrawn
Application number
EP96909350A
Other languages
German (de)
French (fr)
Other versions
EP0821163A1 (en
Inventor
Kenji Morino
Yosuke Oda
Seita Hayashi
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Publication of EP0821163A1 publication Critical patent/EP0821163A1/en
Publication of EP0821163A4 publication Critical patent/EP0821163A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/14—Control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/30—Control of machines or pumps with rotary cylinder blocks
    • F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure

Abstract

An apparatus for controlling swash-plate pumps and motors, provided with a piston (40) fitted slidably in a cylinder bore (31) formed in a housing (20), a large-diameter pressure receiving chamber (43) and a small-diameter pressure receiving chamber (44) defined on both end sides of the piston and permitting the piston to be moved in one direction and in the other by a pressure oil in these chambers, a spool (47) slidably fitted in a spool bore (45) formed in an axial core portion of the piston, a first port (58), a second port (65) and a drain port (66) which are provided between the piston and spool and adapted to be put in a communicating state and shut-off state in accordance with the relative movements of the piston and spool, a third pressure receiving chamber (54) defined on one end side of the spool and adapted to move the spool in one direction by a pressure oil therein, and a spring (74) urging the piston and spool in the other direction, the piston and a swash-plate (4) being connected together so that, when the piston is moved, a tilt angle of the swash-plate varies, the small-diameter pressure receiving chamber communicating with the swash-plate type pump or a primary port (26) of a motor, the first port communicating with the small-diameter chamber and third pressure chamber, the second port communicating with the large-diameter pressure receiving chamber, the drain port communicating with a tank (18) via the interior of the housing, the first and second ports being shut off from each other with the second port and drain port communicating with each other when the piston is moved in one direction relatively to the spool, the first and second ports communicating with each other with the second port and drain port shut off from each other when the piston is moved in the other direction relatively to the spool.
EP96909350A 1995-04-12 1996-04-11 Apparatus for controlling swash-plate pump and motor Withdrawn EP0821163A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP86687/95 1995-04-12
JP08668795A JP3672046B2 (en) 1995-04-12 1995-04-12 Swash plate control device for swash plate pump and motor
PCT/JP1996/001006 WO1996032587A1 (en) 1995-04-12 1996-04-11 Apparatus for controlling swash-plate pump and motor

Publications (2)

Publication Number Publication Date
EP0821163A1 EP0821163A1 (en) 1998-01-28
EP0821163A4 true EP0821163A4 (en) 1998-12-16

Family

ID=13893909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96909350A Withdrawn EP0821163A4 (en) 1995-04-12 1996-04-11 Apparatus for controlling swash-plate pump and motor

Country Status (4)

Country Link
EP (1) EP0821163A4 (en)
JP (1) JP3672046B2 (en)
KR (1) KR960038112A (en)
WO (1) WO1996032587A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103114989A (en) * 2013-01-28 2013-05-22 上海朝田实业有限公司 Follow-up sensitive pump for energy-saving hydraulic pump station
WO2015074167A1 (en) * 2013-11-20 2015-05-28 江苏恒立液压有限公司 Plunger pump power control device and control method thereof
JP2015140763A (en) * 2014-01-30 2015-08-03 キャタピラー エス エー アール エル Engine pump control device and work machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1397084A (en) * 1971-06-12 1975-06-11 Lucas Industries Ltd Actuators for stroke control in hydraulic machines
US4248573A (en) * 1978-09-22 1981-02-03 Kabushiki Kaisha Komatsu Seisakusho Hydraulic control system for variable displacement pump
EP0549883A1 (en) * 1991-11-30 1993-07-07 Samsung Heavy Industries Co., Ltd Control system for hydraulic pumps of the variable displacement type

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113076A (en) * 1983-11-24 1985-06-19 Daikin Ind Ltd Variable volume type hydraulic pump
JPS63106381A (en) * 1986-10-23 1988-05-11 Kayaba Ind Co Ltd Output controller for variable capacity pump
JPH0599124A (en) * 1991-10-07 1993-04-20 Komatsu Ltd Capacity control device for variable capacity type hydraulic pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1397084A (en) * 1971-06-12 1975-06-11 Lucas Industries Ltd Actuators for stroke control in hydraulic machines
US4248573A (en) * 1978-09-22 1981-02-03 Kabushiki Kaisha Komatsu Seisakusho Hydraulic control system for variable displacement pump
EP0549883A1 (en) * 1991-11-30 1993-07-07 Samsung Heavy Industries Co., Ltd Control system for hydraulic pumps of the variable displacement type

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9632587A1 *

Also Published As

Publication number Publication date
JP3672046B2 (en) 2005-07-13
JPH08284806A (en) 1996-10-29
WO1996032587A1 (en) 1996-10-17
EP0821163A1 (en) 1998-01-28
KR960038112A (en) 1996-11-21

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Legal Events

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RTI1 Title (correction)

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