CN103899724A - Hydraulic stepless speed-change transmission mechanism - Google Patents
Hydraulic stepless speed-change transmission mechanism Download PDFInfo
- Publication number
- CN103899724A CN103899724A CN201410161064.XA CN201410161064A CN103899724A CN 103899724 A CN103899724 A CN 103899724A CN 201410161064 A CN201410161064 A CN 201410161064A CN 103899724 A CN103899724 A CN 103899724A
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- China
- Prior art keywords
- oil
- variable displacement
- pump
- displacement pump
- hydraulic motor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H39/00—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution
- F16H39/02—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motors at a distance from liquid pumps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
Abstract
The invention discloses a transmission mechanism, and particularly discloses a hydraulic stepless speed-change transmission mechanism suitable for farm machines. The hydraulic stepless speed-change transmission mechanism comprises an engine and a rear axle walking mechanism and further comprises a variable pump and a hydraulic motor, an output shaft of the engine is connected with an input shaft of the variable pump, a high-pressure cavity of the variable pump is communicated with an oil inlet of the hydraulic motor through a first oil way, a low-pressure cavity of the variable pump is communicated with an oil outlet of the hydraulic motor through a second oil way, a closed loop is formed by the variable pump and the hydraulic motor, an output shaft of the hydraulic motor is connected with an axle package of the rear axle walking mechanism, and a gear controlling rod is installed on the variable pump and fixed on a swash plate of the variable pump. The hydraulic stepless speed-change transmission mechanism is simple and reasonable in structure, original complex mechanical speed adjustment is replaced by hydraulic speed adjustment transmission, the pausing feeling during gear shifting is avoided, driving is smooth, stepless speed adjustment can be achieved, the speed adjustment range is large, operation is convenient to achieve, the structure layout is simple, practicability is high, and energy is saved.
Description
Technical field
The present invention relates to a kind of driving mechanism, be specifically related to a kind of hydraulic stepless speed changes driving mechanism that is applicable to farm machinery.
Background technique
Speed changer is a very important constituent element in automobile, by speed changer, can realize control and the conversion of motor racing direction and speed.The speed changer mostly using on farm machinery is at present all mechanical transmission.Mechanical transmission is mostly step change transmission, and in engine speed one timing, it is selective that step change transmission has limited several definite value velocity ratios, for example 5 forward gearss and a reverse gear.Adopt mechanical transmission, gearshift is often with pause and transition in rhythm or melody sense, and automobilism is smooth-going not, and mechanical transmission volume is larger, mechanical transmission, and surface friction drag is large, and fuel consumption increases, and cannot realize stepless speed regulation.
Summary of the invention
The present invention overcomes the deficiency that prior art exists, and technical problem to be solved has been to provide a kind of simple and reasonable for structure, adopts motor link variable pump, and variable displacement pump drives oil hydraulic motor, thereby drives the hydraulic stepless speed changes driving mechanism of vehicle to run.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of hydraulic stepless speed changes driving mechanism, comprise: motor and back axle traveller, it is characterized in that: also comprise variable displacement pump and oil hydraulic motor, the output shaft of described motor is connected with the input shaft of variable displacement pump, the hyperbaric chamber of described variable displacement pump is connected with the filler opening of oil hydraulic motor by the first oil circuit, the low-pressure cavity of variable displacement pump is connected with the oil outlet of oil hydraulic motor by the second oil circuit, described variable displacement pump and oil hydraulic motor form a closed-loop path, the output shaft of described oil hydraulic motor is connected with the bridge bag of back axle traveller, gear controlling rod is installed on described variable displacement pump, described gear controlling rod is fixed on the swash plate of variable displacement pump.
Preferably, described variable displacement pump is bidirectional variable shaft type plunger pump.
Preferably, described variable delivery side of pump is connected with slippage pump, the filler opening of described slippage pump is connected with fuel tank, the oil outlet of slippage pump is connected with the first oil circuit, the second oil circuit respectively by the first one-way valve, low pressure relief valve one end is connected with the oil outlet of slippage pump, and the other end is connected with fuel tank.
Preferably, be also connected with high-pressure safety valve in described closed-loop path, described high-pressure safety valve one end is connected with the first oil circuit, the second oil circuit by the second one-way valve, and the other end is connected with fuel tank.
The present invention is simple and reasonable for structure, and the transmission of employing Hydraulic Adjustable Speed replaces the mechanical speed governors of original complexity, the pause and transition in rhythm or melody sense while having avoided gearshift, make driving more smooth-going, overall volume of the present invention is little simultaneously, mechanism's compactness, power is large, loses littlely, and efficiency is high, velocity-stabilization is good, can realize stepless speed regulation, speed adjustable range is large, easy to operate, structural configuration is simple and practical, energy saving.
Brief description of the drawings
Fig. 1 is the structural representation of hydraulic stepless speed changes driving mechanism of the present invention.
Fig. 2 is the control principle drawing of hydraulic circuit in the present invention.
In figure: 1 is motor, 2 is back axle traveller, and 3 is variable displacement pump, and 4 is oil hydraulic motor, and 5 is gear controlling rod, 6 is the first oil circuit, and 7 is the second oil circuit, and 8 is slippage pump, and 9 is mailbox, 10 is low pressure relief valve, and 11 is the first one-way valve, and 12 is high-pressure safety valve, and 13 is the second one-way valve.
Embodiment
The specific embodiment of the present invention being done below in conjunction with accompanying drawing is described further.
As shown in Figure 1, a kind of hydraulic stepless speed changes driving mechanism, comprise: motor 1 and back axle traveller 2, it is characterized in that: also comprise variable displacement pump 3 and oil hydraulic motor 4, the output shaft of described motor 1 is connected with the input shaft of variable displacement pump 3, the hyperbaric chamber of described variable displacement pump 3 is connected with the filler opening of oil hydraulic motor 4 by the first oil circuit 6, the low-pressure cavity of variable displacement pump 3 is connected with the oil outlet of oil hydraulic motor 4 by the second oil circuit 7, described variable displacement pump 3 and oil hydraulic motor 4 form a closed-loop path, the output shaft of described oil hydraulic motor 4 is connected with the bridge bag of back axle traveller 2, on described variable displacement pump 3, gear controlling rod 5 is installed, described gear controlling rod 5 is fixed on the swash plate of variable displacement pump 3.
Described variable displacement pump 3 is bidirectional variable shaft type plunger pump.
The output terminal of described variable displacement pump 3 is connected with slippage pump 8, the filler opening of described slippage pump 8 is connected with fuel tank 9, the oil outlet of slippage pump 8 is connected with the first oil circuit 6, the second oil circuit 7 respectively by the first one-way valve 11, low pressure relief valve 10 one end are connected with the oil outlet of slippage pump 8, and the other end is connected with fuel tank 9.
In described closed-loop path, be also connected with high-pressure safety valve 12, described high-pressure safety valve 12 one end are connected with the first oil circuit 6, the second oil circuit 7 by the second one-way valve 13, and the other end is connected with fuel tank 9.
When concrete use, variable displacement pump 3 is bidirectional variable shaft type plunger pump, and the power input shaft of its one end can directly be connected with power source, as motor, motor, also can be connected with power source by clutch or speed-changing gear box simultaneously, and the other end
For auxiliary output terminal, can drive slippage pump is whole closed type hydraulic system repairing, makes in advance whole oil circuit be full of fluid, in addition, slippage pump constantly extracts the cold oil liquid through supercooler from fuel tank, promotes the circulation of fluid, reduces the steady liter of fluid in closed system.Oil hydraulic motor 4 directly drives back axle traveller 2 to move.Variable displacement pump 3 and oil hydraulic motor 4 are as the executive component of whole hydraulic system, it is energy conversion device, variable displacement pump 3 rotates under the dynamic action of motor 1, convert the mechanical energy of input to hydraulic energy, be connected with oil hydraulic motor 4 with the second oil circuit 7 by the first oil circuit 6, under the driving effect of corresponding hydraulic fluid flow rate, pressure, oil hydraulic motor rotates, and then output speed, torque, hydraulic energy is converted back to mechanical energy again again.In whole hydraulic circuit, the hyperbaric chamber of variable displacement pump 3 is connected with return opening with the filler opening of oil hydraulic motor 4 respectively with low-pressure cavity, is directly communicated with by the casting oil circuit of oil distribution casing and central cover, forms a closed-loop path.The input shaft of variable displacement pump 3 drives plunger body rotation by spline joint, and each plunger is made axial reciprocating straight line motion with the rotation of plunger body, thereby semi-ring is discharged high pressure oil on oil distribution casing, and lower semi-ring sucks low pressure oil and is full of active chamber; 4 of oil hydraulic motors utilize high low pressure fluid pressure reduction to produce torque, drive motor shaft turn, outputting power.
On variable displacement pump 3, be provided with gear controlling rod 5, gear controlling rod 5 is fixed on the swash plate of variable displacement pump 3, deflection angle and the deflection direction of gear controlling rod 5 controlled variable pump 3 swash plates, thereby travelling speed and the direction of travel of control vehicle.When the swash plate of variable displacement pump 3 and pump shaft are time in vertical position, pump shaft only drives slippage pump work, pump shaft idle running, not oil extraction of pump, at this moment reaper is in neutral gear position: in the time of the swash plate of variable displacement pump 3 and pump shaft deflection several angle, pump starts oil extraction, and displacement size is determined by variable displacement pump swash plate deflection angle size, the larger discharge capacity of angle is larger, and pump oil direction depends on the direction of variable swash plate deflection.Change the angle and direction of variable displacement pump 3 swash plates by gear controlling rod 5, control the rotating speed of motor and turn to, and then control travelling speed and the direction of travel of machine.
By reference to the accompanying drawings embodiments of the invention are explained in detail above; but the present invention is not limited to above-described embodiment; in the ken possessing those of ordinary skill in the art; can also under the prerequisite that does not depart from aim of the present invention, make obtaining various variations, also should be considered as protection scope of the present invention.
Claims (4)
1. a hydraulic stepless speed changes driving mechanism, comprise: motor 1 and back axle traveller 2, it is characterized in that: also comprise variable displacement pump 3 and oil hydraulic motor 4, the output shaft of described motor 1 is connected with the input shaft of variable displacement pump 3, the hyperbaric chamber of described variable displacement pump 3 is connected with the filler opening of oil hydraulic motor 4 by the first oil circuit 6, the low-pressure cavity of variable displacement pump 3 is connected with the oil outlet of oil hydraulic motor 4 by the second oil circuit 7, described variable displacement pump 3 and oil hydraulic motor 4 form a closed-loop path, the output shaft of described oil hydraulic motor 4 is connected with the bridge bag of back axle traveller 2, on described variable displacement pump 3, gear controlling rod 5 is installed, described gear controlling rod 5 is fixed on the swash plate of variable displacement pump 3.
2. a kind of hydraulic stepless speed changes driving mechanism according to claim 1, is characterized in that: described variable displacement pump 3 is bidirectional variable shaft type plunger pump.
3. a kind of hydraulic stepless speed changes driving mechanism according to claim 2, it is characterized in that: the output terminal of described variable displacement pump 3 is connected with slippage pump 8, the filler opening of described slippage pump 8 is connected with fuel tank 9, the oil outlet of slippage pump 8 is connected with the first oil circuit 6, the second oil circuit 7 respectively by the first one-way valve 11, low pressure relief valve 10 one end are connected with the oil outlet of slippage pump 8, and the other end is connected with fuel tank 9.
4. a kind of hydraulic stepless speed changes driving mechanism according to claim 1, it is characterized in that: in described closed-loop path, be also connected with high-pressure safety valve 12, described high-pressure safety valve 12 one end are connected with the first oil circuit 6, the second oil circuit 7 by the second one-way valve 13, and the other end is connected with fuel tank 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161064.XA CN103899724A (en) | 2014-04-22 | 2014-04-22 | Hydraulic stepless speed-change transmission mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161064.XA CN103899724A (en) | 2014-04-22 | 2014-04-22 | Hydraulic stepless speed-change transmission mechanism |
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| CN103899724A true CN103899724A (en) | 2014-07-02 |
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| CN201410161064.XA Pending CN103899724A (en) | 2014-04-22 | 2014-04-22 | Hydraulic stepless speed-change transmission mechanism |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196706A (en) * | 2014-07-31 | 2014-12-10 | 安徽佳乐建设机械有限公司 | Variable pump control device for driving of off-road traveling chassis |
| CN106051108A (en) * | 2016-05-04 | 2016-10-26 | 陈金祥 | Variable gear pump type automobile stepless speed changer |
| CN106740082A (en) * | 2016-12-19 | 2017-05-31 | 长安大学 | A kind of land leveller traveling fluid pressure drive device of low-speed big output |
| CN106969122A (en) * | 2016-01-13 | 2017-07-21 | 熵零技术逻辑工程院集团股份有限公司 | A kind of hydraulic mechanism |
| CN107444109A (en) * | 2017-07-13 | 2017-12-08 | 安徽合力股份有限公司宝鸡合力叉车厂 | A kind of internal combustion static-pressure forklift transmission system |
| CN107776401A (en) * | 2017-11-20 | 2018-03-09 | 力源液压（苏州）有限公司 | A kind of dual-speed hydraulic running gear |
| CN108050225A (en) * | 2017-12-29 | 2018-05-18 | 浙江大学城市学院 | Stepless speed changing with hydraulic transmission system |
| CN113757332A (en) * | 2021-09-02 | 2021-12-07 | 浙江大学 | Mechanical hydraulic composite transmission system and control method |
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2014
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196706A (en) * | 2014-07-31 | 2014-12-10 | 安徽佳乐建设机械有限公司 | Variable pump control device for driving of off-road traveling chassis |
| CN106969122A (en) * | 2016-01-13 | 2017-07-21 | 熵零技术逻辑工程院集团股份有限公司 | A kind of hydraulic mechanism |
| CN106051108A (en) * | 2016-05-04 | 2016-10-26 | 陈金祥 | Variable gear pump type automobile stepless speed changer |
| CN106740082A (en) * | 2016-12-19 | 2017-05-31 | 长安大学 | A kind of land leveller traveling fluid pressure drive device of low-speed big output |
| CN106740082B (en) * | 2016-12-19 | 2023-05-30 | 长安大学 | Flat grader running hydraulic driving device with low-speed and large-torque output |
| CN107444109A (en) * | 2017-07-13 | 2017-12-08 | 安徽合力股份有限公司宝鸡合力叉车厂 | A kind of internal combustion static-pressure forklift transmission system |
| CN107776401A (en) * | 2017-11-20 | 2018-03-09 | 力源液压（苏州）有限公司 | A kind of dual-speed hydraulic running gear |
| CN108050225A (en) * | 2017-12-29 | 2018-05-18 | 浙江大学城市学院 | Stepless speed changing with hydraulic transmission system |
| CN108050225B (en) * | 2017-12-29 | 2023-09-08 | 浙江大学城市学院 | Hydraulic transmission stepless speed change system |
| CN113757332A (en) * | 2021-09-02 | 2021-12-07 | 浙江大学 | Mechanical hydraulic composite transmission system and control method |
| CN113757332B (en) * | 2021-09-02 | 2024-02-20 | 浙江大学 | Mechanical and hydraulic compound transmission system and control method |
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Application publication date: 20140702 |