CN86108529A - Power-transmission system - Google Patents
Power-transmission system Download PDFInfo
- Publication number
- CN86108529A CN86108529A CN86108529.9A CN86108529A CN86108529A CN 86108529 A CN86108529 A CN 86108529A CN 86108529 A CN86108529 A CN 86108529A CN 86108529 A CN86108529 A CN 86108529A
- Authority
- CN
- China
- Prior art keywords
- pump
- pressure
- compensator
- load sensing
- valve
- 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- Withdrawn
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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
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)
Abstract
A kind of variable pump systems wherein has the pressure compensator of an operate pump controlling mechanism, carries out variable by liquid being led to pump-regulating mechanism, and has a spring biased plunger to apply variable power to pump-regulating mechanism, the pushing pressure compensator.A load sensing control valve unit sensing is arranged by the load pressure of a system valve by the fluid of pump supply, and utilize this load pressure and spring biased plunger co-operation, purpose is that pump is pushed to maximum capacity.
Description
The present invention relates to variable pump systems.
Known a pressure compensator can be set in variable pump systems, handle a pump-regulating mechanism, changing the displacement volume of pump, and a spring biased plunger be arranged, pressure compensator is done variable pushing.Belong to equally and be known that a load sensing valve also is set.Its function is the displacement volume that changes pump, and the piston of a spring bias voltage is arranged, and load sensing and compensating device is done variable pushing.Except when pump pressure is when the limit that pressure compensator is set, pressure compensator is to outside the load sensing and compensating device override, and load sensing and compensating device plays the master controller of pump.In addition, knownly can use the hydrodynamic pressure that passes to a system valve or directional control valve, pass the spring biased plunger co-operation.
A problem of this system is under high load and work as connecting pipeline in short-term, and system tends to instability, causes hydraulic impulse, so that load or controlled device generation vibration.
Therefore, one object of the present invention is to propose a kind of more stable variable pump systems.
According to the present invention, the load pressure that will take from a load sensing hole or system valve connects, and this load pressure is delivered on the piston of spring bias voltage, rather than the delivery pressure of pump is passed to spring biased plunger.
Fig. 1 is the schematic representation of the system in the prior art.
Fig. 2 is for implementing the schematic representation of system of the present invention.
Implement variable displacement pump control system of the present invention, can obtain the most clearly understanding with reference to figure 1, Fig. 1 be the hydraulic scheme of system in the prior art field, as U. S. Patent the 3rd, 554, is disclosed in No. 093.Now quoted from this as a reference with this paper.
As shown in Figure 1, variable displacement pump 10 can be the variable wobbler type shown in the above-mentioned patent, includes a swash plate 11, can change the displacement volume of axial piston when movable.A spring biased plunger 12 is arranged, can push wobbler 11 to the maximum displacement position.A big yoke shape positioning piston 13 is arranged, act on the swash plate 11 in the mode opposite with spring biased plunger 12.
The fluid that pump 10 is discharged is drawn towards a load such as the fluid power actuator, arrives a system valve or directional control valve 15 by pipeline 14, arrives spring biased plunger 12 by pipeline 16, arrives pressure compensator 18 by pipeline 17.Pressure compensator 18 is by the known manner work of control valve 22 with the present technique field, when increased pressure during to the limit that the spring force by control valve 22 sets, and the change displacement volume.One end of load sensing and compensating device 19 is connected by the pipeline 20 in system valve downstream and the pressure of the fluid that is transported to load by system valve 15.Pump pressure is connected with the other end of load sensing and compensating device 19 by pipeline 17-17a.Load sensing and compensating device 19 is by pipeline 17b, and 17c connects, and has made it the effect that control is added in the pressure on the positioning piston 13.If the pressure of pump is lower than the limit that control valve 22 is set, then the load sensing guiding valve 19a of load sensing and compensating device 19, by leading to the pipeline 17c of positioning piston 13,17b, control pump, according to the pump pressure requirement that is higher than load pressure, for example be higher than the about 14-21 kgf of load pressure/centimetre
2(200 to 300 pounds/square inch) to carry the flow of loading accurately, change its displacement volume.This about 14-21 kgf/centimetre
2The pressure reduction of (200 to 300 pounds/square inch) is to obtain by the springs preload lotus in the load compensation device 19.
It is found that this system is unstable under high load, cause the pulse in the fluid and the vibration of controlled device, especially hour so at flow.
Referring to Fig. 2, according to the present invention, the pipeline 16 among cancellation Fig. 1, pipeline 21 leads to spring biased plunger 12 from the pipeline 20 in system valve 15 downstreams, and load pressure is delivered to biases piston 12.
Found that this system can overcome the stability problem of the system in the prior art shown in Figure 1 field.
Though narration for system, it is the use that is combined in the slant plate type variable displacement pump, but those skilled in the art that are appreciated that, the present invention also can be used for other types, have on the pump of various different adjustment mechanisms with the change displacement volume, such as eccentric adjustment variable-vane pump, reach with a pump that is placed on the rotating assembly in the canting yoke assembly parts housing.
Claims (2)
1, a kind of control system of volume adjustable hydraulic pump comprising:
A variable displacement pump that has pump-regulating mechanism wherein has a fluid power positioning piston device and a spring biased plunger device, and the mode that the latter can be relative pushes described positioning piston device changeably,
Load sensing guiding valve compensator device,
Described pump has an outlet and an import,
The first passage device is connected delivery side of pump with an end of described load sensing guiding valve compensator device, the described delivery side of pump pressure of sensing, described pump to one the load discharge pressure,
The second channel device is between described load sensing guiding valve compensator device and described positioning piston device, and the motor reaction with described load sensing guiding valve compensator device promotes described pump-regulating mechanism,
A system valve,
The third channel device between described pump discharge and described system valve,
The four-way device between the described load sensing guiding valve compensator device the other end and described system valve,
The invention is characterized in the four-way device that also is included in described system valve downstream and the five-way duct device between the described spring biased plunger device.
2, the variable displacement pump control system described in claim 1 is characterized in that, a pressure compensated piston device is wherein arranged, and the one end is connected with described first passage device,
Described pressure compensator is connected with described second channel device, with the stress reaction of second channel device, changes the pressure to described positioning device, thereby when pressure surpasses prearranging quatity, changes the displacement of pump-regulating mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80852785A | 1985-12-13 | 1985-12-13 | |
| US808,527 | 1985-12-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86108529A true CN86108529A (en) | 1987-06-17 |
| CN1007542B CN1007542B (en) | 1990-04-11 |
Family
ID=25199037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87105369A Expired CN1007542B (en) | 1985-12-13 | 1986-12-12 | Power transmission system |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0226125B1 (en) |
| JP (1) | JPH0819922B2 (en) |
| CN (1) | CN1007542B (en) |
| CA (1) | CA1248410A (en) |
| DE (1) | DE3678538D1 (en) |
| IN (1) | IN166532B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865143A (en) * | 2010-07-08 | 2010-10-20 | 中国航天科技集团公司第六研究院第十一研究所 | Device for automatically adjusting power of turbine pump |
| CN101558242B (en) * | 2006-11-06 | 2013-07-10 | 卡特彼勒公司 | Method and system for controlling machine power |
| CN111911381A (en) * | 2020-07-26 | 2020-11-10 | 中国航发贵州红林航空动力控制科技有限公司 | Nozzle differential pressure valve mechanism with damping piston |
Families Citing this family (2)
| 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 |
| CN113266319B (en) * | 2021-07-01 | 2023-06-23 | 龙信阀业集团有限公司 | Gas lift valve suitable for pressure-variable gas lift process |
Family Cites Families (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 |
| SE323286B (en) * | 1967-12-04 | 1970-04-27 | Sperry Rand Corp | |
| 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/en not_active Expired - Fee Related
- 1986-12-03 EP EP86116785A patent/EP0226125B1/en not_active Expired - Lifetime
- 1986-12-11 JP JP61295683A patent/JPH0819922B2/en not_active Expired - Fee Related
- 1986-12-12 CN CN87105369A patent/CN1007542B/en not_active Expired
- 1986-12-12 CA CA000525243A patent/CA1248410A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101558242B (en) * | 2006-11-06 | 2013-07-10 | 卡特彼勒公司 | Method and system for controlling machine power |
| CN101865143A (en) * | 2010-07-08 | 2010-10-20 | 中国航天科技集团公司第六研究院第十一研究所 | Device for automatically adjusting power of turbine pump |
| CN111911381A (en) * | 2020-07-26 | 2020-11-10 | 中国航发贵州红林航空动力控制科技有限公司 | Nozzle differential pressure valve mechanism with damping piston |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1248410A (en) | 1989-01-10 |
| EP0226125A2 (en) | 1987-06-24 |
| IN166532B (en) | 1990-05-26 |
| JPS62253980A (en) | 1987-11-05 |
| CN1007542B (en) | 1990-04-11 |
| EP0226125B1 (en) | 1991-04-03 |
| JPH0819922B2 (en) | 1996-03-04 |
| EP0226125A3 (en) | 1989-07-05 |
| DE3678538D1 (en) | 1991-05-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |