CN103527450A - Axial plunger variable pump - Google Patents
Axial plunger variable pump Download PDFInfo
- Publication number
- CN103527450A CN103527450A CN201310486929.5A CN201310486929A CN103527450A CN 103527450 A CN103527450 A CN 103527450A CN 201310486929 A CN201310486929 A CN 201310486929A CN 103527450 A CN103527450 A CN 103527450A
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- China
- Prior art keywords
- pump
- valve
- pressure
- variable
- axial plunger
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Abstract
The invention relates to a through shaft plunger pump and provides an axial plunger variable pump. The axial plunger variable pump comprises a pump body, wherein the pump body is respectively connected with an oil supplementation pump, an oil supplementation overflow valve, an oil supplementation one-way valve, a high-pressure overflow system, a pressure cutting valve and a variable control system. The axial plunger variable pump is complex in structure, integrates various hydraulic control valves and can avoid overloading; different control modes can be configured according to customer requirements, the automatic degree is high, and remote operation can be achieved; the axial plunger variable pump serves as a power element of a hydrostatic drive closed system, and is the first choice of plunger pumps for road building and maintaining machines, harbor machines and concrete pumping machines in the present world.
Description
Technical field
The present invention relates to a kind of axis plunger pump.
Background technique
Hydrostatic transmissions (HydroStatic Transmission, HsT) system liquid collecting press pump, motor, in one, are converted into hydraulic energy by mechanical energy by oil hydraulic pump, are mechanical energy again by oil hydraulic motor by hydraulic energy transfer.Hydrostatic transmissions belongs to enclosed volumetric speed control category in hydraulic transmission, is the enclosed volume speed-modulating loop integrated, integrated degree is higher.According to whether discharge capacity in hydrostatic transmissions is adjustable, can be divided into 4 kinds of system compound modes: 1) a certain amount of motor of metering pump; 2) metering pump one variable displacement motor; 3) a certain amount of motor of variable displacement pump; 4) variable displacement pump one variable displacement motor.The main feature of this type systematic is can stepless speed regulation, speed adjustable range
Wide, there is no the overflow energy loss of throttle grverning, system is difficult for heating, can realize permanent torque or constant-power speed regulation and transmission efficiency high.The efficiency of HST output shaft slow-speed of revolution section is more high than hydraudynamic drive, efficient district also wider but in high-velocity section not as hydraudynamic drive and electric drive, this has just determined that it is mainly used in the running mechanism that speed is lower.At present hydrostatic transmissions is at loader, bulldozer, fork truck, and the field such as farm machinery, building machinery is widely used.The shaft type bidirectional variable cam-type axial piston pumps (hereinafter to be referred as " coaxial pump ") that use in hydrostatic transmission more.The Variable Control mode of coaxial pump is a lot, mainly contains manual servocontrol, pressure-dependent hydraulic control, hydraulic control, torque control and electric control (proportional control, two controls) etc. relevant with rotating speed, and multifunction valve is also integrated on pump.
Summary of the invention
The present invention aims to provide a kind of shaft orientation plunger variable pump that can realize numerous variations control.
Shaft orientation plunger variable pump of the present invention, comprises pump body, and wherein pump body is connected with variable control system with slippage pump, repairing relief valve, repairing one-way valve, high pressure overflow system, pressure shut-off valve respectively.
Preferably, described slippage pump is and the coaxial hydraulic gear pump being connected of pump body.
Or preferably, described pressure shut-off valve is comprised of an outer controlled overflow valve and a shuttle valve.
Or preferably, described variable control system comprises interconnective change control mechanism and variable piston.
Or preferably, described high pressure overflow system comprises high-pressure overflow valve and repairing one-way valve.
Complex structure of the present invention, integrated many kinds of liquid pressure control valve, can avoid overload, according to the configurable different control mode of customer demand, automaticity is high, can realize Remote operation, be that the world today builds road maintainance machinery, harbour machinery, the first-selected plunger pump of concrete pumping machinery as the dynamical element of hydrostatic transmissions closed system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, 1. pressure shut-off valve 2. slippage pump 3. filter 4. repairing relief valve 5. high-pressure overflow valve 6. variable control mechanism 7. variable piston 8. pump bodies.
Embodiment
Embodiment 1
As shown in Figure 1, shaft orientation plunger variable pump of the present invention, except pump body, is also integrated with slippage pump, repairing relief valve, repairing one-way valve, high pressure overflow system, pressure shut-off valve and variable control system.
1 pressure shut-off valve
Pressure shut-off valve is comprised of an outer controlled overflow valve and a shuttle valve, shuttle valve detects and compares the pressure of high-pressure oil pipe, when the pressure of high-pressure oil pipe reaches the set pressure of outer controlled overflow valve, outer controlled overflow valve is opened, control oil and the fuel tank of variable displacement pump control mechanism are connected, and pump delivery is rapidly close to 0; If pump delivery pressure continues to raise, high-pressure overflow valve 5 is opened, and makes pump in minimum discharge capacity underflow stream.Pressure shut-off valve, when system acceleration or deceleration, can stop high-pressure overflow valve to be opened, thereby high pressurized overflow often appears in anti-locking system, the heating of minimizing system.
2 slippage pumps
Slippage pump is the small dimension hydraulic gear pump being coaxially connected with main pump, and its effect has: 1) supplement closed circuit and leak oil; 2) inlet port of assurance pump has certain pressure, improves the oil suction condition of pump; 3) provide constant voltage to control oil sources to pump variable control mechanism; 4), when using DA control gear, can be used for detecting the rotating speed of motor.
3 filters
Filter can use also can using of integrated form freestanding, is used for the hydraulic oil of service pump output to filter, and guarantees variable control mechanism reliably working.Filter can also be matched cold start-up valve, is used for protecting pump, when due to the reason such as oil temperature is too low
While causing filter two ends pressure reduction too high (as being greater than 0.6 MPa); cold start-up valve is opened; cold start-up valve is equivalent to a bypass unloading valve; slippage pump outlet and fuel tank are connected; system made does not play pilot pressure; main pump just can variable yet, in zero pivot angle state, plays the effect of protective system.
4 repairing relief valves
Repairing relief valve is a low pressure relief valve, during work, in normally open, guarantees that slippage pump oil compensation pressure is approximately a steady state value.
5 high-pressure overflow valves
Comprise two cover high-pressure overflow valves, every cover high-pressure overflow valve comprises 1 high-pressure overflow valve and 1 repairing one-way valve, and high-pressure overflow valve is not normally opened, and is under normal circumstances after cut-off valve works, if system pressure continues to be elevated to high-pressure overflow valve, adjusts
Constant-pressure, high-pressure overflow valve just can be opened and make pump in small displacement underflow stream.Repairing one-way valve is that slippage pump is to the passage of pump low pressure oil way repairing.
Claims (5)
1. shaft orientation plunger variable pump, comprises pump body, it is characterized in that pump body is connected with variable control system with slippage pump, repairing relief valve, repairing one-way valve, high pressure overflow system, pressure shut-off valve respectively.
2. electric power moment changing typ loader as claimed in claim 1, is characterized in that described slippage pump is and the coaxial hydraulic gear pump being connected of pump body.
3. electric power moment changing typ loader as claimed in claim 1, is characterized in that described pressure shut-off valve is comprised of an outer controlled overflow valve and a shuttle valve.
4. electric power moment changing typ loader as claimed in claim 1, is characterized in that described variable control system comprises interconnective change control mechanism and variable piston.
5. electric power moment changing typ loader as claimed in claim 1, is characterized in that described high pressure overflow system comprises high-pressure overflow valve and repairing one-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310486929.5A CN103527450A (en) | 2013-10-17 | 2013-10-17 | Axial plunger variable pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310486929.5A CN103527450A (en) | 2013-10-17 | 2013-10-17 | Axial plunger variable pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103527450A true CN103527450A (en) | 2014-01-22 |
Family
ID=49929717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310486929.5A Pending CN103527450A (en) | 2013-10-17 | 2013-10-17 | Axial plunger variable pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103527450A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879333A (en) * | 2015-05-22 | 2015-09-02 | 上海秋林机械有限公司 | Hydrostatic drive system and walking vehicle |
| CN105370643A (en) * | 2015-12-23 | 2016-03-02 | 北汽福田汽车股份有限公司 | Engineering machinery and closed type hydraulic system thereof |
| CN108317132A (en) * | 2018-03-26 | 2018-07-24 | 徐工集团工程机械有限公司 | A kind of control system preventing sand throwing extinguishing vehicle impeller rotation overload |
-
2013
- 2013-10-17 CN CN201310486929.5A patent/CN103527450A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879333A (en) * | 2015-05-22 | 2015-09-02 | 上海秋林机械有限公司 | Hydrostatic drive system and walking vehicle |
| CN105370643A (en) * | 2015-12-23 | 2016-03-02 | 北汽福田汽车股份有限公司 | Engineering machinery and closed type hydraulic system thereof |
| CN108317132A (en) * | 2018-03-26 | 2018-07-24 | 徐工集团工程机械有限公司 | A kind of control system preventing sand throwing extinguishing vehicle impeller rotation overload |
| CN108317132B (en) * | 2018-03-26 | 2024-04-02 | 江苏徐工工程机械研究院有限公司 | Control system for preventing rotation overload of impeller of sand throwing fire extinguishing vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140122 |
|
| WD01 | Invention patent application deemed withdrawn after publication |