EP0226125A2 - Système de pompage à refoulement variable - Google Patents

Système de pompage à refoulement variable Download PDF

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Publication number
EP0226125A2
EP0226125A2 EP86116785A EP86116785A EP0226125A2 EP 0226125 A2 EP0226125 A2 EP 0226125A2 EP 86116785 A EP86116785 A EP 86116785A EP 86116785 A EP86116785 A EP 86116785A EP 0226125 A2 EP0226125 A2 EP 0226125A2
Authority
EP
European Patent Office
Prior art keywords
pressure
pump
load sensing
piston
compensator
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
EP86116785A
Other languages
German (de)
English (en)
Other versions
EP0226125B1 (fr
EP0226125A3 (en
Inventor
Lael Brent Taplin
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.)
Vickers Inc
Original Assignee
Vickers Inc
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 Vickers Inc filed Critical Vickers Inc
Publication of EP0226125A2 publication Critical patent/EP0226125A2/fr
Publication of EP0226125A3 publication Critical patent/EP0226125A3/en
Application granted granted Critical
Publication of EP0226125B1 publication Critical patent/EP0226125B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • This invention relates to variable displacement pump systems and particularly to hydraulic pump control systems thereof.
  • an objective of the present invention is to provide a variable displacement pump system which is more stable.
  • the load pressure as taken from a load sensing port or downstream from the system valve is connected to deliver this load pressure to the spring biased piston rather than using the output pressure of the pump to the spring biasing piston.
  • the variable displacement pump 10 may be of the variable axial piston type shown in US-A-3,554,093 which is incorporated herein by reference and comprises a yoke and-a swash plate 11 that are movable to vary the stroke of axial pistons (not shown).
  • a first smaller positioning piston 12 which is spring biased and is acted upon by a pressure yieldingly urges the yoke and the swash plate 11 to a maximum displacement position.
  • a second larger positioning piston 13 acts on the yoke and the swash plate 11 in opposition to the first positioning piston 12.
  • Working fluid flow from the pump 10 is directed through a feed line 14 to a directional valve system 15 ("system valve") and extended to a load such as a hydraulic actuator.
  • system valve directional valve system 15
  • a control line 16 (shown in dashed lines) connects the pump outlet to the first positioning piston 12. Pump outlet pressure is connected through a further control line 17 to a compensator arrangement 18 / 19.
  • the compensator arrangement comprises a pressure compensator 18 which may be of the pilot valve 22 controlled type to decrease the displacement as the pressure increases above a limit set by the spring force on pilot valve 22 (protection against over pressure).
  • the compensator arrangement also includes a load sensing compensator 19 which is connected at its first spool end 19a by the control line 17, 17a to pump outlet pressure, and at its second spool end 19b by a load sensing line 20 downstream of the system valve 15 to the pressure of fluid being delivered to the load.
  • a load sensing compensator 19 which functions to modulate pump outlet pressure in lines 17, 17a and to deliver such modulated pressure via lines 17b, 17c to the second positioning piston 13. Modulation also depends on the spring preload of compensator 19.
  • the second positioning piston 13 which is larger in cross section than the first positioning piston determines the position of the yoke and swashplate 11 and therefore pump delivery rate.
  • the displacement is varied in a manner to deliver exactly the load flow required by the actuator or actuators at the load pressure, which is, for example, 14 to 21 bar (200 to 300 p.s.i.) below the pump outlet pressure.
  • the load pressure which is, for example, 14 to 21 bar (200 to 300 p.s.i.) below the pump outlet pressure.
  • control line 16 is eliminated and a control line 21 is added which extends from the load sensing line 20 downstream of valve system 15 to the first positioning piston 12 which, therefore, is acted upon by load pressure.
  • any change in the flow rate has a simultaneous influence on both positioning pistons 12 and 13, i. e. changes in the load pressure and in the modulated pressure will arrive practically simultaneously at the first positioning piston 12 and the second positioning piston 13, respectively, whereas it is believed that in the prior art system the influence on the first piston 12 (pump outlet pressure) is followed with a time lag by the influence on the second piston 13 (modulated pressure) so that the position of the swash plate is changed in one direction immediately followed by a change in the other direction which might be the reason for the pulsations observed.
  • variable displacement pump of the swash plate type
  • pump adjusting mechanism for varying the displacement
  • eccentric adjustment variable vane pumps and pumps using a rotating group housed in a tiltable yoke assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
EP86116785A 1985-12-13 1986-12-03 Système de pompage à refoulement variable Expired - Lifetime EP0226125B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80852785A 1985-12-13 1985-12-13
US808527 1985-12-13

Publications (3)

Publication Number Publication Date
EP0226125A2 true EP0226125A2 (fr) 1987-06-24
EP0226125A3 EP0226125A3 (en) 1989-07-05
EP0226125B1 EP0226125B1 (fr) 1991-04-03

Family

ID=25199037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86116785A Expired - Lifetime EP0226125B1 (fr) 1985-12-13 1986-12-03 Système de pompage à refoulement variable

Country Status (6)

Country Link
EP (1) EP0226125B1 (fr)
JP (1) JPH0819922B2 (fr)
CN (1) CN1007542B (fr)
CA (1) CA1248410A (fr)
DE (1) DE3678538D1 (fr)
IN (1) IN166532B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5183393A (en) * 1992-02-10 1993-02-02 Schaffner Larey D Power limiter control for a variable displacement axial piston pump

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7797092B2 (en) * 2006-11-06 2010-09-14 Caterpillar Inc Method and system for controlling machine power
CN101865143B (zh) * 2010-07-08 2012-05-23 中国航天科技集团公司第六研究院第十一研究所 一种涡轮泵功率自动调节装置
CN111911381B (zh) * 2020-07-26 2022-12-06 中国航发贵州红林航空动力控制科技有限公司 一种带阻尼活塞的喷口压差活门机构
CN113266319B (zh) * 2021-07-01 2023-06-23 龙信阀业集团有限公司 一种适用于变压力气举举升工艺的气举阀

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2502546A (en) * 1947-03-28 1950-04-04 Denison Eng Co Hydraulic apparatus
US3067693A (en) * 1958-12-24 1962-12-11 United Aircraft Corp Control means for variable delivery pump
US3554093A (en) * 1967-12-04 1971-01-12 Sperry Rand Corp Constant power regulator for hydraulic pumps
US4072442A (en) * 1975-07-04 1978-02-07 Takeshi Horiuchi Variable delivery hydraulic pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2502546A (en) * 1947-03-28 1950-04-04 Denison Eng Co Hydraulic apparatus
US3067693A (en) * 1958-12-24 1962-12-11 United Aircraft Corp Control means for variable delivery pump
US3554093A (en) * 1967-12-04 1971-01-12 Sperry Rand Corp Constant power regulator for hydraulic pumps
US4072442A (en) * 1975-07-04 1978-02-07 Takeshi Horiuchi Variable delivery hydraulic pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5183393A (en) * 1992-02-10 1993-02-02 Schaffner Larey D Power limiter control for a variable displacement axial piston pump

Also Published As

Publication number Publication date
CA1248410A (fr) 1989-01-10
IN166532B (fr) 1990-05-26
JPS62253980A (ja) 1987-11-05
CN1007542B (zh) 1990-04-11
EP0226125B1 (fr) 1991-04-03
JPH0819922B2 (ja) 1996-03-04
EP0226125A3 (en) 1989-07-05
CN86108529A (zh) 1987-06-17
DE3678538D1 (de) 1991-05-08

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