CN203835833U - Buffer device for hydrostatic walking system of vehicle - Google Patents
Buffer device for hydrostatic walking system of vehicle Download PDFInfo
- Publication number
- CN203835833U CN203835833U CN201420218658.5U CN201420218658U CN203835833U CN 203835833 U CN203835833 U CN 203835833U CN 201420218658 U CN201420218658 U CN 201420218658U CN 203835833 U CN203835833 U CN 203835833U
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- China
- Prior art keywords
- pressure oil
- vehicle
- high pressure
- valve
- pressure
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- Expired - Lifetime
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- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 239000002243 precursor Substances 0.000 claims description 8
- 238000013016 damping Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 33
- 230000006870 function Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007659 motor function Effects 0.000 description 1
Abstract
The utility model discloses a buffer device for a hydrostatic walking system of a vehicle. The buffer device for the hydrostatic walking system of the vehicle is provided with a hydraulic closed pump and a variable displacement motor, wherein the variable displacement motor is connected with the hydraulic closed pump through a high-pressure oil advancing path and a high-pressure oil retreating path, a pilot-operated pressure relief valve is arranged between the high-pressure oil advancing path and the high-pressure oil retreating path, a one-way valve is arranged on the high-pressure oil retreating path, a logic valve which is connected with the one-way valve in parallel is further arranged on the high-pressure oil retreating path, and the logic valve is connected with the high-pressure oil advancing path through the pressure relief valve. According to the buffer device for the hydrostatic walking system of the vehicle, the working condition of the variable displacement motor is opposite to the working condition of the hydraulic closed pump when the vehicle runs downhill, high-pressure oil generated by the variable displacement motor overflows firstly through the pilot-operated pressure relief valve and then overflows through the relief valve after the pressure of the high-pressure oil is reduced through the logic valve, the pressure fed back to the hydraulic closed pump is reduced, in this way, high-pressure of the system and overspeed of the vehicle can be effectively prevented when the vehicle runs downhill, a diesel engine is prevented from being damaged, the vehicle can run smoothly and slowly under the downhill condition so that driving safety can be guaranteed, and the buffer device can be widely used for mining hydrostatic transmission control.
Description
Technical field
The utility model relates to the hydrostatic running gear damping device of a kind of vehicle to run control gear, particularly a kind of vehicle.
Background technique
Hydrostatic transmissions has good power performance and control performance, and mine trackless assistant conveyance car particularly bracket carrier hydrostatic drive technology reaches its maturity, and hydrostatic drive is extensively promoted under colliery.
Hydrostatically driven vehicle is when descending at present, because motional inertia is particularly when the ratio of slope is larger, its partical gravity strengthens, in hydraulic driving there is contrary variation in pump and motor function, hydraulic pressure installation back transfer power, motor is braked by friction torque, is called engine braking, and this mode of braking and hydrostatic pump and motor displacement are than relevant.When pump displacement is zero, by motor displacement and system pressure, to brake, this kind of braking is called the hydrostatic braking.Because motional inertia will make vehicle, accelerate, along with car speed increases diesel engine counter braking force square, reduce gradually, finally easily diesel engine is damaged.
Summary of the invention
The technical problems to be solved in the utility model is for the deficiencies in the prior art, proposes a kind of being convenient to and installs, and easily detects, and avoids the hydrostatic running gear damping device of diesel engine deadlined vehicle.
The technical problems to be solved in the utility model is achieved through the following technical solutions, the hydrostatic running gear damping device of a kind of vehicle, be provided with hydraulic closed pump and variable displacement motor, variable displacement motor is by in-line before high pressure oil, high pressure oil retreats oil circuit and hydraulic closed pump joins, be characterized in: before high pressure oil, in-line and high pressure oil retreat to be provided with between oil circuit and be communicated with the precursor overflow valve that in-line and high pressure oil before high pressure oil retreat oil circuit, at high pressure oil, retreat on oil circuit and be provided with one-way valve between precursor overflow valve and hydraulic closed pump, at high pressure oil, retreat and on oil circuit, be also provided with the logical valve in parallel with one-way valve, logical valve by relief valve and high pressure oil before in-line join.
Compared with prior art, at vehicle descending variations per hour motor and hydraulic closed pump, there is contrary operating mode in the utility model, the high pressure oil that variable displacement motor produces first passes through precursor overflow valve overflow, after being reduced pressure by logical valve again through relief valve overflow, reduce to feed back to the pressure of hydraulic closed pump, can effectively prevent system high pressure and vehicle descending hypervelocity, guarantee that vehicle can slowly travel stably on ramp, avoid the impaired of diesel engine, make vehicle when descending operating mode, steadily slowly guarantee traffic safety, can be widely used in the hydrostatic transmissions control of colliery.
Accompanying drawing explanation
Fig. 1 is hydraulic schematic diagram of the present utility model.
Embodiment
The hydrostatic running gear damping device of a kind of vehicle, be provided with hydraulic closed pump 6 and variable displacement motor 1, variable displacement motor 1 is by in-line before high pressure oil, high pressure oil retreats oil circuit and hydraulic closed pump 6 joins, before high pressure oil, in-line and high pressure oil retreat to be provided with between oil circuit and are communicated with the precursor overflow valve 2 that in-line and high pressure oil before high pressure oil retreat oil circuit, at high pressure oil, retreat on oil circuit and be provided with one-way valve 5 between precursor overflow valve 2 and hydraulic closed pump 6, at high pressure oil, retreat and on oil circuit, be also provided with the logical valve in parallel with one-way valve 54, logical valve 4 joins by in-line before relief valve 3 and high pressure oil.
With reference to accompanying drawing 1; the utility model is arranged on the hydraulic circuit of vehicle rollback; when vehicle is under traction state and descending state; diesel engine is respectively in output and input two states; under normal traction state, work; diesel engine output torque vehicle to run; under vehicle descending state; hydraulic closed pump 6 and variable displacement motor 1 exchange function; diesel engine is instead by speedup state; now engine friction resistance cannot overcome hydraulic haulage power, for preventing that overspeed of vehicle from damaging this damping device of diesel engine using and protecting.Concrete control is as follows, when vehicle descending, due to motional inertia, hydraulic closed pump 6 and variable displacement motor 1 exchange function, motor sends the part that energy cannot be offset above-mentioned resistance increment, so external hydraulic system is accelerated anti-explosion diesel engine thereby Vehicle Speed increases.Vehicle at normal level road with while going up a slope hydraulic oil all from one-way valve normally by not affecting the nominal situation of vehicle, its working principle is as follows: the B1 of hydraulic closed pump, B2 pump end, B1 is high pressure oil direction of advance, B2 is that high pressure oil is direction of retreat, vehicle descending constantly in B1 high pressure oil system hydraulic closed pump and variable displacement motor there is contrary operating mode, the variable swash plate that now B2 mouth becomes pushed at high pressure hydraulic closed pump from original low pressure changes to small displacement, again because now so hydraulic closed pump is the little rotating speed rising of the operating mode discharge capacity drive diesel engine acceleration of variable displacement motor, high pressure oil during present descending, variable displacement motor being produced passes through precursor overflow valve overflow by A2, after being reduced pressure by logical valve again through relief valve overflow, the pressure that feeds back to B2 hydraulic closed pump is reduced, effectively prevent system pressure rising vehicle speedup, effectively protect diesel engine, automatically realize and controlling, make vehicle when descending operating mode, steadily slowly guarantee traffic safety.
Claims (1)
1. the hydrostatic running gear damping device of vehicle, be provided with hydraulic closed pump and variable displacement motor, variable displacement motor is by in-line before high pressure oil, high pressure oil retreats oil circuit and joins with hydraulic closed pump respectively, it is characterized in that: before high pressure oil, in-line and high pressure oil retreat to be provided with between oil circuit and be communicated with the precursor overflow valve that in-line and high pressure oil before high pressure oil retreat oil circuit, at high pressure oil, retreat on oil circuit and be provided with one-way valve between precursor overflow valve and hydraulic closed pump, at high pressure oil, retreat and on oil circuit, be also provided with the logical valve in parallel with one-way valve, logical valve by relief valve and high pressure oil before in-line join.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420218658.5U CN203835833U (en) | 2014-04-30 | 2014-04-30 | Buffer device for hydrostatic walking system of vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420218658.5U CN203835833U (en) | 2014-04-30 | 2014-04-30 | Buffer device for hydrostatic walking system of vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203835833U true CN203835833U (en) | 2014-09-17 |
Family
ID=51513680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420218658.5U Expired - Lifetime CN203835833U (en) | 2014-04-30 | 2014-04-30 | Buffer device for hydrostatic walking system of vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203835833U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108146245A (en) * | 2017-12-29 | 2018-06-12 | 航天重型工程装备有限公司 | A kind of control system of preventing engine hypervelocity |
-
2014
- 2014-04-30 CN CN201420218658.5U patent/CN203835833U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108146245A (en) * | 2017-12-29 | 2018-06-12 | 航天重型工程装备有限公司 | A kind of control system of preventing engine hypervelocity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |