EP0226125A2 - Système de pompage à refoulement variable - Google Patents
Système de pompage à refoulement variable Download PDFInfo
- 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
Links
Images
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)
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)
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)
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)
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 |
-
1986
- 1986-12-02 IN IN870/CAL/86A patent/IN166532B/en unknown
- 1986-12-03 DE DE8686116785T patent/DE3678538D1/de not_active Expired - Fee Related
- 1986-12-03 EP EP86116785A patent/EP0226125B1/fr not_active Expired - Lifetime
- 1986-12-11 JP JP61295683A patent/JPH0819922B2/ja not_active Expired - Fee Related
- 1986-12-12 CN CN87105369A patent/CN1007542B/zh not_active Expired
- 1986-12-12 CA CA000525243A patent/CA1248410A/fr not_active Expired
Patent Citations (4)
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)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4559778A (en) | Control device for a hydrostatic transmission | |
US4074529A (en) | Load responsive system pump controls | |
CN1265101C (zh) | 带有压力补偿流量控制的液压控制阀*** | |
EP0545925B1 (fr) | Soupape de compensation de pression et de controle de charge | |
US4420935A (en) | Hydraulic system | |
US8286544B2 (en) | Hydraulic control system | |
CA2001780A1 (fr) | Pompes a cylindree variable | |
JPH0674204A (ja) | 複数の消費器のための油圧式の制御装置 | |
JPS589301B2 (ja) | 流体静力学的駆動装置 | |
US5222870A (en) | Fluid system having dual output controls | |
US4034564A (en) | Piston pump assembly having load responsive controls | |
EP0226125A2 (fr) | Système de pompage à refoulement variable | |
US4695230A (en) | Power transmission | |
CA1039107A (fr) | Pompe a piston avec dispositif de commande assujetti a la pression de charge | |
EP0015069B1 (fr) | Régulation hydraulique pour maintenir constante la puissance de sortie d'une pompe à débit variable | |
JPS6157475B2 (fr) | ||
JP2649181B2 (ja) | 可変排除量ポンプの自動制御装置 | |
GB2279776A (en) | A hydraulic load sensing system | |
US4880359A (en) | Summation power output regulating system for at least two hydrostatic transmissions | |
KR101756770B1 (ko) | 밸브 장치 | |
GB1597059A (en) | Control apparatus for a displacement machine | |
JP2521658B2 (ja) | 液圧システム | |
GB1267461A (en) | Hydraulic control apparatus for driving a drivable member | |
GB1599233A (en) | Control device for at least two adjustable pumps | |
GB2160595A (en) | Reciprocating pump |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE DE FR GB IT SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE DE FR GB IT SE |
|
17P | Request for examination filed |
Effective date: 19891227 |
|
17Q | First examination report despatched |
Effective date: 19900522 |
|
ITF | It: translation for a ep patent filed |
Owner name: DE DOMINICIS & MAYER S.R.L. |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB IT SE |
|
REF | Corresponds to: |
Ref document number: 3678538 Country of ref document: DE Date of ref document: 19910508 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19931117 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19931124 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19941204 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19941231 |
|
EAL | Se: european patent in force in sweden |
Ref document number: 86116785.6 |
|
BERE | Be: lapsed |
Owner name: VICKERS INC. Effective date: 19941231 |
|
EUG | Se: european patent has lapsed |
Ref document number: 86116785.6 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20031230 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20041104 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20041201 Year of fee payment: 19 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050701 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20051203 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20051203 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20051203 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060831 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20060831 |