CN220037113U - Hydrostatic drive hydraulic system for straddle carrier and straddle carrier - Google Patents
Hydrostatic drive hydraulic system for straddle carrier and straddle carrier Download PDFInfo
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- CN220037113U CN220037113U CN202321679289.5U CN202321679289U CN220037113U CN 220037113 U CN220037113 U CN 220037113U CN 202321679289 U CN202321679289 U CN 202321679289U CN 220037113 U CN220037113 U CN 220037113U
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- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000011010 flushing procedure Methods 0.000 claims description 14
- 230000000153 supplemental effect Effects 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 71
- 230000005540 biological transmission Effects 0.000 description 13
- 239000002245 particle Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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Abstract
The utility model discloses a hydrostatic drive hydraulic system for a straddle carrier and the straddle carrier, wherein the hydraulic system comprises a traveling pump, a traveling motor connected with the traveling pump, and the traveling pump supplies oil for the traveling motor; a high-low speed switching and braking valve is connected between the traveling pump and the traveling motor; the two groups of the traveling motors are provided with a flow dividing valve for controlling the same flow of the traveling motors at the left side and the right side in the traveling process of the vehicle, so that synchronous traveling control of the traveling motors at the left side and the right side is realized; the straddle carrier is in a low-speed section, the displacement of a variable motor in a traveling motor is controlled to be maximum, and stepless speed regulation is realized by changing the displacement of a variable pump in a traveling pump; the straddle carrier is in a high-speed section, the displacement of a variable pump in the traveling pump is controlled to be maximum, and stepless speed regulation is realized by adjusting the displacement of the variable motor in the traveling motor. The technical scheme of the utility model can realize continuous variable speed within a certain range and has good stepless speed change performance.
Description
Technical Field
The utility model relates to a hydraulic system, in particular to a hydrostatic drive hydraulic system for a straddle carrier and the straddle carrier.
Background
Continuously variable transmission has been the goal pursued by engineering machinery and harbour machinery drive systems. At present, the vehicles capable of continuously variable transmission commonly utilize the basic principles of machinery, hydraulic power, hydraulic pressure and electric power to realize the continuously variable transmission. The hydraulic stepless transmission has small size and light weight, the disadvantages of small power and short service life of mechanical friction stepless transmission are avoided, the driving efficient area is far larger than that of hydraulic transmission, and when the power and the rotating speed are the same, the weight of the hydraulic motor is only a fraction of that of the motor, so that the hydraulic stepless transmission is more suitable for being widely applied to engineering machinery driving than mechanical stepless transmission, hydraulic transmission and electric transmission in the basic working principles.
The straddle carrier drive system requires a large speed regulation range, and the speed range is continuously adjustable from rest to maximum vehicle speed, and a convenient reversing function is required. The hydrostatic drive system of the straddle carrier is flexible in structure, has various combination forms and is different in corresponding component parts. The system can be divided into an open system and a closed system according to the characteristic of a loop,
conventional hydrostatic drive systems have two approaches, integral and split, depending on the arrangement. The integral hydrostatic transmission device combines a hydraulic pump and a hydraulic motor, and has a relatively fixed position relationship between an input shaft and an output shaft. Is generally applicable to small displacement hydrostatic drives. The advantage is compact structure, does not need the pipeline to connect in the middle, and use cost is lower. The disadvantages are: the installation layout has certain limitation and has stronger specificity. In the split scheme, the hydraulic pump and the hydraulic motor are independent elements and are usually connected by pipelines, so that any combination of the hydraulic pump and the hydraulic motor with different displacement and different variable forms can be realized, such as a variable hydraulic pump one-to-one quantitative hydraulic motor and a variable hydraulic pump-variable hydraulic motor system, and various working condition requirements of a host can be met through reasonable parameter matching. The installation is more flexible, and the arrangement can be carried out according to the design requirement of the host.
However, the prior art uses a mechanical link technology for switching between high and low speeds, and has a complex structure, and cannot realize continuous speed change within a certain range, and has poor continuously variable transmission performance.
Disclosure of Invention
The utility model aims to: the utility model aims to provide a hydrostatic drive hydraulic system for a straddle carrier and the straddle carrier, which realize continuous speed change in a certain range and have good stepless speed change performance.
The technical scheme is as follows: the utility model comprises a traveling pump, a traveling motor connected with the traveling pump, and a traveling pump for supplying oil to the traveling motor; a high-low speed switching and braking valve is connected between the traveling pump and the traveling motor; the two groups of the traveling motors are provided with a flow dividing valve, and the flow dividing valve is used for controlling the same flow of the traveling motors at the left side and the right side in the traveling process of the vehicle, so that synchronous traveling control of the traveling motors at the left side and the right side is realized; the straddle carrier is in a low-speed section, the displacement of a variable motor in a traveling motor is controlled to be maximum, and stepless speed regulation is realized by changing the displacement of a variable pump in a traveling pump; the straddle carrier is in a high-speed section, the displacement of a variable pump in the traveling pump is controlled to be maximum, and stepless speed regulation is realized by adjusting the displacement of the variable motor in the traveling motor.
The travelling pump comprises a variable pump, a first electromagnetic valve, a second electromagnetic valve and a first overflow valve, and the variable pump is mechanically connected with the motor in a driving way; the two ends of the displacement control element of the variable pump are hydraulically connected with the first oil port of the first electromagnetic valve and the first oil port of the second electromagnetic valve; the second oil port of the first electromagnetic valve is connected with the second oil port of the second electromagnetic valve and then is hydraulically connected with the variable pump through the overflow valve, and the third oil port of the first electromagnetic valve is hydraulically connected with the third oil port of the second electromagnetic valve.
The walking pump further comprises a supplemental oil pump coaxially connected with the variable pump, and the output end of the supplemental oil pump is connected with the flow dividing valve through the supplemental oil filter; the oil supplementing pump and the variable pump are coaxially arranged, so that the oil supplementing pump can work simultaneously as long as the variable pump works, leakage oil of the system and hot oil flushed by the flushing valve can be synchronously supplemented, and reliable and stable work of the system is ensured.
The walking motors comprise variable motors and brakes, a first working oil port A of one variable motor in the two groups of walking motors is connected to a first oil port of a synchronous flow dividing valve in the flow dividing valve, a first working oil port A of the other variable motor is connected to a third oil port of the synchronous flow dividing valve in the flow dividing valve, and a second working oil port B of the two variable motors is connected; and a second oil port of the synchronous flow dividing valve is connected to the high-low speed switching valve, the braking valve and the traveling pump.
The high-low speed switching and braking valve comprises a third electromagnetic valve, a fourth electromagnetic valve, a shuttle valve, a pressure reducing valve and a second overflow valve; the first oil port of the third electromagnetic valve is connected with a brake, and the first oil port of the fourth electromagnetic valve is connected with a variable motor; the second oil ports of the third electromagnetic valve and the fourth electromagnetic valve are connected and then connected to one end of a second overflow valve, and the other end of the second overflow valve is connected with the third oil port of the third electromagnetic valve and the third oil port of the fourth electromagnetic valve; the second overflow valve is also connected with a shuttle valve through a pressure reducing valve, and the high-low speed switching and braking valve is used for realizing speed switching.
The flow dividing valve further comprises a flushing valve, a third oil port of the flushing valve is connected with the oil tank, and the flushing valve enables the system to run stably, rapidly and reliably.
And a radiator and an oil return filter are sequentially connected in series on an oil way between the third oil port of the flushing valve and the oil tank. The radiator is arranged to radiate heat continuously generated in the running process of the system, so that the oil temperature of the system can be kept within the range of the oil temperature required by the hydraulic element, and the service lives of the hydraulic part and the hydraulic oil are prolonged; the purpose of the oil return filter is to filter impurities and particulate matter out of the hydraulic system.
The oil supplementing pump is connected with the oil tank through an oil absorption filter, and the oil absorption filter has the function of avoiding the hydraulic pump from sucking impurities and particles in hydraulic oil in the hydraulic oil tank into the system and protecting the cleanliness of the system.
In this scheme, motor drive running pump, running pump drive hydraulic motor, hydraulic motor drive wheel limit speed reducer, vehicle travel when wheel limit speed reducer drive tire. The braking control is used for ensuring that the vehicle can be braked and parked. The high and low speeds act to give the vehicle two driving gears.
The utility model also includes a straddle carrier including a hydrostatic drive hydraulic system for the straddle carrier.
The beneficial effects are that: compared with the prior art, the technical scheme of the utility model has the beneficial effects that: the two-gear function of the straddle carrier is realized, the two-gear function can be continuously variable in a certain range, and the continuously variable transmission has good stepless speed change performance; the system adopts a synchronous diverter valve to ensure the running synchronization of the left and right running variable motors; the system is provided with the flushing valve, so that the system runs stably and rapidly and has higher reliability; the system designs a running high-low speed switching and braking valve for speed switching.
Drawings
FIG. 1 is an overall hydraulic schematic of a hydrostatic drive hydraulic system for a straddle carrier of the present utility model;
FIG. 2 is a hydraulic schematic of a travel pump;
FIG. 3 is a hydraulic schematic diagram of a high and low speed switching and braking valve;
FIG. 4 is a hydraulic schematic of a diverter valve;
fig. 5 is a hydraulic schematic diagram of the travel motor.
Detailed Description
The technical scheme of the utility model is described in detail below with reference to the detailed description and the attached drawings.
As shown in figure 1, the hydrostatic drive hydraulic system for the straddle carrier comprises a traveling pump, a traveling motor, a high-low speed switching and braking valve and a flow dividing valve. The walking pump is connected with the walking motor and supplies oil to the walking motor. And a high-low speed switching and braking valve is connected between the traveling pump and the traveling motor and used for high-low speed switching and vehicle braking. The high and low speeds may be equivalent to two gears of a car. Different gears correspond to different driving condition requirements. The purpose of high-low speed switching is to make full use of vehicle energy consumption and work efficiency, and the vehicle is driven at high speed when empty, can reduce the time wasted on the way. When the vehicle is fully loaded, the vehicle can walk at a low speed to realize the maximum or optimal driving force, so that the power of the vehicle is fully utilized. The two groups of the traveling motors are provided with the flow dividing valves, and the flow dividing valves are used for ensuring that the flow rates of the traveling motors at the left side and the right side are the same in the traveling process of the vehicle, so that synchronous traveling control of the traveling motors at the left side and the right side is realized. The elements specifically involved are as follows: the hydraulic control system comprises a first electromagnetic valve 1, a second electromagnetic valve 2, a motor 3, a variable pump 4, a makeup pump 5, a makeup filter 6, a fuel tank 7, a first overflow valve 8, a return oil filter 9, a radiator 10, an empty filter 11, a third electromagnetic valve 12, a fourth electromagnetic valve 13, a shuttle valve 14, a pressure reducing valve 15, a second overflow valve 16, a variable motor 17, a flushing valve 18, a brake 20 and an oil suction filter 21.
As shown in fig. 1 and 2, the walking pump comprises a variable pump 4, a first electromagnetic valve 1, a second electromagnetic valve 2 and a first overflow valve 8, and the variable pump 4 is mechanically and drivingly connected with a motor 3; the two ends of the displacement control element of the variable pump 4 are hydraulically connected with the first oil port of the first electromagnetic valve 1 and the first oil port of the second electromagnetic valve 2; the second oil port of the first electromagnetic valve 1 is connected with the second oil port of the second electromagnetic valve 2, and then is hydraulically connected with the variable pump 4 through the overflow valve 8, and the third oil port of the first electromagnetic valve 1 is hydraulically connected with the third oil port of the second electromagnetic valve 2. The pump further comprises a supplemental pump 5 coaxially connected with the variable pump 4, and the output end of the supplemental pump 5 is connected with a flow dividing valve through a supplemental filter 6. In this scheme, make-up pump 5 is connected with oil tank 7 through oil absorption filter 21.
The driving direction of the front gear and the rear gear of the vehicle is controlled by controlling the first electromagnetic valve 1 and the second electromagnetic valve 2 to be electrified; when the power is supplied to Y01a of the first electromagnetic valve 1, the vehicle is in a forward gear, and at this time, the rotation speed of the motor 3 and the displacement of the variable pump 4 are controlled by stepping on an accelerator pedal. The larger the throttle, the higher the rotational speed of the motor 3, the larger the displacement of the variable displacement pump 4, and the faster the vehicle speed. When the Y01b electromagnetic valve on the second electromagnetic valve 2 is powered on, the vehicle is in a reverse gear, and the speed operation is the same as that of a forward gear.
As shown in fig. 1 and 3, the high-low speed switching and braking valve includes a third solenoid valve 12, a fourth solenoid valve 13, a shuttle valve 14, a pressure reducing valve 15, and a second relief valve 16. The first oil port of the third electromagnetic valve 12 is connected with a brake 20, and the first oil port of the fourth electromagnetic valve 13 is connected with a variable motor 17; the second oil ports of the third electromagnetic valve 12 and the fourth electromagnetic valve 13 are connected and then connected to one end of a second overflow valve 16, and the other end of the second overflow valve 16 is connected with the third oil port of the third electromagnetic valve 12 and the third oil port of the fourth electromagnetic valve 13; the second relief valve 16 is also connected to the shuttle valve 14 via a relief valve 15.
The low speed is used for heavy load running and the high speed is used for idle running. The high-low speed motion switching during walking is realized by controlling the DT6 on the fourth electromagnetic valve 13 to be electrified. The traveling speed reducer brake can be started by controlling the DT5 on the third solenoid valve 12 to be powered on, and the parking brake is released when the DT5 on the third solenoid valve 12 is powered on.
As shown in fig. 1, 4 and 5, the traveling motor comprises variable motors 17 and a brake 20, wherein a first working oil port a of one variable motor 17 in two groups of traveling motors is connected to a first oil port of a synchronous diverter valve 19 in the diverter valve, a first working oil port a of the other variable motor 17 is connected to a third oil port of the synchronous diverter valve 19 in the diverter valve, and a second working oil port B of the two variable motors 17 is connected; the second oil port of the synchronous diverter valve 19 is connected to a high-low speed switching and braking valve and a traveling pump. And a shunt valve is arranged to ensure the running synchronization of the left and right running variable motors. When the vehicle is in a parked state, the spring force closes the brake 20. The DT5 obtained voltage oil on the third solenoid valve 12 counteracts the spring force of the parking brake and releases the parking brake during running. The variable motor 17 is designed as a two-speed variable motor.
The diverter valve also comprises a flushing valve 18, and a third oil port of the flushing valve 18 is connected with the oil tank 7; a radiator 10 and an oil return filter 9 are connected in series in this order to an oil passage between the third port of the flushing valve 18 and the oil tank 7. The oil return filter 9 is provided because of the particles generated by the abrasion of the hydraulic components during the operation of the system, and the particles generated by the flushing of the pressure oil in the pipeline, the oil tank and the like. The increase of these particles may jeopardize the normal operation of the hydraulic system, and the purpose of the oil return filter 9 is to filter impurities and particles out of the hydraulic system.
The flush valve 18 is used to control the drive system oil temperature to ensure that the oil temperature is used within a reasonable temperature range.
In the scheme, in a low-speed section, the displacement of the control variable motor 17 is maximum, and the displacement of the variable pump 4 is changed to realize the capacity speed regulation working characteristic of the system; in the high-speed section, the displacement of the variable pump 4 is controlled to be maximum, and the purpose of speed regulation is realized by regulating the displacement of the variable motor 17, so that the speed regulation range of the system is wide, and various complex application working conditions can be met.
The utility model also comprises a straddle carrier comprising the hydrostatic drive hydraulic system for the straddle carrier.
Claims (9)
1. A hydrostatic drive hydraulic system for a straddle carrier, characterized by: the device comprises a traveling pump, a traveling motor connected with the traveling pump, and a motor for supplying oil to the traveling motor; a high-low speed switching and braking valve is connected between the traveling pump and the traveling motor; the two groups of the traveling motors are provided with a flow dividing valve, and the flow dividing valve is used for controlling the same flow of the traveling motors at the left side and the right side in the traveling process of the vehicle, so that synchronous traveling control of the traveling motors at the left side and the right side is realized;
the straddle carrier is in a low-speed section, the displacement of a variable motor (17) in a traveling motor is controlled to be maximum, and stepless speed regulation is realized by changing the displacement of a variable pump (4) in a traveling pump; the straddle carrier controls the displacement of the variable pump (4) in the travelling pump to be maximum in a high-speed section, and stepless speed regulation is realized by regulating the displacement of the variable motor (17) in the travelling motor.
2. The hydrostatic drive hydraulic system for a straddle carrier of claim 1, wherein: the walking pump comprises a variable pump (4), a first electromagnetic valve (1), a second electromagnetic valve (2) and a first overflow valve (8), and the variable pump (4) is mechanically connected with the motor (3) in a driving way; two ends of a displacement control element of the variable pump (4) are hydraulically connected with a first oil port of the first electromagnetic valve (1) and a first oil port of the second electromagnetic valve (2); the second oil port of the first electromagnetic valve (1) is connected with the second oil port of the second electromagnetic valve (2) and then is hydraulically connected with the variable pump (4) through the overflow valve (8), and the third oil port of the first electromagnetic valve (1) is hydraulically connected with the third oil port of the second electromagnetic valve (2).
3. The hydrostatic drive hydraulic system for a straddle carrier of claim 2, wherein: the walking pump further comprises a supplemental pump (5) coaxially connected with the variable pump (4), and the output end of the supplemental pump (5) is connected with the flow dividing valve through a supplemental filter (6).
4. The hydrostatic drive hydraulic system for a straddle carrier of claim 1, wherein: the walking motors comprise variable motors (17) and a brake (20), wherein a first working oil port A of one variable motor (17) in the two groups of walking motors is connected to a first oil port of a synchronous flow dividing valve (19) in the flow dividing valve, a first working oil port A of the other variable motor (17) is connected to a third oil port of the synchronous flow dividing valve (19) in the flow dividing valve, and a second working oil port B of the two variable motors (17) is connected; and a second oil port of the synchronous flow dividing valve (19) is connected to the high-low speed switching and braking valve and the traveling pump.
5. The hydrostatic drive hydraulic system for a straddle carrier of claim 4, wherein: the high-low speed switching and braking valve comprises a third electromagnetic valve (12), a fourth electromagnetic valve (13), a shuttle valve (14), a pressure reducing valve (15) and a second overflow valve (16);
a first oil port of the third electromagnetic valve (12) is connected with a brake (20), and a first oil port of the fourth electromagnetic valve (13) is connected with a variable motor (17); the second oil ports of the third electromagnetic valve (12) and the fourth electromagnetic valve (13) are connected and then connected to one end of a second overflow valve (16), and the other end of the second overflow valve (16) is connected with the third oil port of the third electromagnetic valve (12) and the third oil port of the fourth electromagnetic valve (13); the second overflow valve (16) is also connected with the shuttle valve (14) through the pressure reducing valve (15).
6. The hydrostatic drive hydraulic system for a straddle carrier of claim 4, wherein: the diverter valve also comprises a flushing valve (18), and a third oil port of the flushing valve (18) is connected with the oil tank (7).
7. The hydrostatic drive hydraulic system for a straddle carrier of claim 6, wherein: and a radiator (10) and an oil return filter (9) are sequentially connected in series on an oil path between a third oil port of the flushing valve (18) and the oil tank (7).
8. A hydrostatic drive hydraulic system for a straddle carrier according to claim 3, wherein: the oil supplementing pump (5) is connected with the oil tank (7) through an oil absorbing filter (21).
9. A straddle carrier, characterized by: comprising the hydrostatic drive hydraulic system for a straddle carrier of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321679289.5U CN220037113U (en) | 2023-06-29 | 2023-06-29 | Hydrostatic drive hydraulic system for straddle carrier and straddle carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321679289.5U CN220037113U (en) | 2023-06-29 | 2023-06-29 | Hydrostatic drive hydraulic system for straddle carrier and straddle carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220037113U true CN220037113U (en) | 2023-11-17 |
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ID=88736359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321679289.5U Active CN220037113U (en) | 2023-06-29 | 2023-06-29 | Hydrostatic drive hydraulic system for straddle carrier and straddle carrier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220037113U (en) |
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2023
- 2023-06-29 CN CN202321679289.5U patent/CN220037113U/en active Active
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