CN112572122A - Power assembly of pure electric loader - Google Patents
Power assembly of pure electric loader Download PDFInfo
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- CN112572122A CN112572122A CN202011585572.2A CN202011585572A CN112572122A CN 112572122 A CN112572122 A CN 112572122A CN 202011585572 A CN202011585572 A CN 202011585572A CN 112572122 A CN112572122 A CN 112572122A
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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
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
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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
- B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
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Abstract
A power assembly of a pure electric loader comprises a vehicle control unit, a power supply system, a driving motor, a motor controller, a working motor controller, a hydraulic pump, a hydraulic system, a working device, a two-gear automatic transmission and a drive axle, wherein the drive axle internally comprises a main speed reducer, a differential mechanism, a half axle, a speed sensor and a transmission controller; the power system is respectively connected with the driving motor controllers and the working motor controllers of the front shaft and the rear shaft, the motor controllers are respectively connected with the motors controlled by the motor controllers, and the driving motors of the front shaft and the rear shaft are mechanically connected with the corresponding two-gear automatic transmission and the corresponding drive axle to transmit power to the driving wheels to drive the wheels to run; the working motor is mechanically connected with the hydraulic pump, and the hydraulic pump is in fluid flow connection with the hydraulic system and provides power for the working device to work; and the vehicle control unit is electrically connected with the sensor and each controller, receives and processes the information of each part, and sends a working instruction to each part.
Description
Technical Field
The invention relates to a power assembly of a loader, in particular to an electric power assembly of the loader.
Background
The patent with the application number of CN201611040533.8 and the patent name of invention of 'double-mode drive loader' discloses a double-mode drive loader for solving the problem that the loader uses single energy, which comprises an electric drive traveling system, a series hybrid power system and a vehicle-mounted power adapter connected with a power grid, wherein the series hybrid power system comprises an engine, a generator driven by the engine to generate electricity, a vehicle-mounted storage battery connected with the generator, and an inverter connected with the vehicle-mounted storage battery and the generator, and the inverter is connected with the electric drive traveling system; and the power output end of the vehicle-mounted power adapter is connected with the inverter. The invention has two power sources of an engine and electric power of a power grid, and can use the traditional petrochemical fuel and the power supply of the power grid; the dependence of the loader on petrochemical fuel is reduced, and the fuel consumption and harmful emissions are reduced. The two driving modes adopt different energy supply devices and share the same executing device (such as a motor), so that the transmission system of the loader is simplified, and the transmission efficiency is improved.
Patent with application number CN201520682565.2, utility model name "front and rear axle independent drive loader structure", discloses a front and rear axle independent drive loader structure and torque dynamic allocation method, the structure includes: the system comprises an engine, a generator, a rectifier, a super capacitor, three driving motors, a hydraulic pump, a working device, a front driving axle, a rear driving axle, two front wheels, two rear wheels, a vehicle control unit, an engine controller, a super capacitor controller, three driving motor controllers, a hydraulic pump controller, four wheel sensors, a front driving axle sensor, a rear driving axle sensor and an operation instruction. Collecting an operation instruction and vehicle running state parameters, and processing and calculating the collected data; and controlling by adopting a corresponding control strategy according to the processed data, and sending a torque control command to each driving motor according to the control strategy. The utility model discloses can rationally carry out front and back axle torque distribution according to front and back axle load change, improve the energy utilization of whole car, simultaneously, this system can also improve the dynamic property of vehicle at the extreme condition, full play independent drive's advantage.
The patent with application number CN201420051936.2, utility model name "loader" discloses a novel loader for the structural style that the drive system that gets off of solving among the prior art loader adopts torque converter, gearbox and transaxle, and transmission efficiency is low, the big problem of energy consumption. This loader includes get off travel device and get off regenerating unit, wherein: the get-off running device comprises an engine, a power pump, a pump motor, a power coupler, a first transmission mechanism, a second transmission mechanism and a driving wheel; the engine is mechanically connected with the power pump; get off regenerating unit includes energy storage ware and pump motor, and the pump motor includes power pivot, first hydraulic fluid port and second hydraulic fluid port, and pump motor and energy storage ware intercommunication. The power pump is communicated with the pump motor, and the pump motor is also communicated with the oil tank; the pump motor is mechanically connected to the first drive shaft. The driving wheels of the second transmission shaft are mechanically connected, and the power rotating shaft of the pump motor can drive each driving wheel to rotate. The loader can realize full hydraulic drive.
The patent with the application number of CN201120354313.9 and the name of the utility model of a double-axle wheel steering and double-axle drive loader discloses a small-sized loader suitable for karst cave mines, highway clearing yards and small operation sites. The hydraulic lifting turning system is mainly technically characterized in that wheel type turning structures are arranged on front and rear turning drive axles in the turning system, namely a gear pump is connected with a reverser, the reverser is connected with the reverser, the redirector is connected with a turning oil cylinder, the turning oil cylinder is connected with the turning drive axle, a turning oil cylinder is arranged between the turning drive axle and the frame, and the turning is controlled by the stretching of the turning oil cylinder. The utility model discloses a beneficial efficiency is: the original articulated type, front axle wheel type steering or rear axle wheel type steering structure is changed, and the front and rear axle driving axles are all in wheel type steering, so that the working space is greatly reduced, and the working time is shortened.
The pure electric loader power assembly adopts a driving motor and a working motor of a front shaft and a rear shaft respectively to independently drive a walking part and a working part of a loader respectively, the driving motor of the front shaft is mechanically connected with a front drive axle through a front shaft two-gear transmission, and output power drives front wheels to run; the rear shaft driving motor is mechanically connected with a rear drive axle through a rear shaft two-gear transmission, and outputs power to drive rear wheels to run; the working motor is connected with the hydraulic pump and outputs power for the working device. The front and rear axle driving motors of the walking part are the motors with the same specification and model, the driving motor and the two-gear transmission of the walking part replace an internal combustion engine and a hydraulic torque converter, the two motors respectively drive the front and rear axles, the working point of the motors can be intelligently adjusted in time, the high-efficiency working area of the motors is increased, the working efficiency of the motors is improved, the working time of the loader is prolonged, and the maneuverability of the loader can be improved to a certain extent by double-axle driving; the working part uses the motor to drive and provide power for the hydraulic pump, the motor is a working motor, so that the working device can complete the work, the working pressure of the motor of the driving system can be effectively reduced, and the walking motor and the working motor are separately installed and independently controlled, so that the complexity and the reliability of the control system are reduced, the control is easy, and the manufacturing cost is reduced; the front shaft and the rear shaft are respectively provided with a two-gear automatic transmission, the transmission ratio of each gear of the transmission is different, the automatic switching of the gears can be intelligently realized according to the vehicle speed and the working condition, and the different gears of the front shaft and the rear shaft are combined to form a full-time four-wheel drive mode with various driving speeds so as to meet the requirements on the driving force and the vehicle speed under different working conditions.
Disclosure of Invention
The invention aims to design a power assembly of a pure electric loader, which adopts a front shaft driving motor, a rear shaft driving motor and a working motor to independently control a walking part and a working part of the loader, wherein the front shaft driving motor is mechanically connected with a front drive axle through a front shaft two-gear automatic transmission and outputs power to drive front wheels to run; the rear shaft driving motor is mechanically connected with a rear drive axle through a rear shaft two-gear automatic transmission, and outputs power to drive rear wheels to run; the working motor is connected with the hydraulic pump and outputs power for the working device. The walking part adopts two walking motors with the same power to replace an internal combustion engine, the walking motors respectively drive the front shaft and the rear shaft, the working points of the motors can be timely and intelligently adjusted, the high-efficiency working area of the motors is increased, the working efficiency of the motors is improved, the working time of the loader is prolonged, and the maneuverability of the loader can be improved to a certain extent by double-shaft driving; the working part uses the working motor to provide power for the hydraulic pump, so that the working device finishes working, the working pressure of the motor of the driving system can be effectively reduced, and the walking motor and the working motor are separately installed and independently controlled, so that the complexity of the design of a control system is reduced, the control is easy, and the manufacturing cost is reduced; the front shaft and the rear shaft are respectively provided with a two-gear automatic transmission, the transmission ratio of each gear of the transmission is different, the automatic switching of the gears can be intelligently realized according to the vehicle speed and the working condition, and the different gears of the front shaft and the rear shaft are combined to form a full-time four-wheel drive mode with various driving speeds so as to meet the requirements on the driving force and the vehicle speed under different working conditions.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a power assembly of a pure electric loader comprises a vehicle control unit, a power supply system, a driving motor, a motor controller, a working motor controller, a hydraulic pump, a hydraulic system, a working device, a two-gear automatic transmission and a driving axle, wherein the driving axle is internally provided with a main speed reducer, a differential mechanism, a half shaft, a speed sensor and a transmission controller; the front drive axle is mechanically connected with the front axle two-gear automatic transmission, a main speed reducer, a differential mechanism and a half shaft are arranged in the front drive axle, the power transmitted by the transmission is transmitted to wheels, and the front drive axle drives the two wheels of the front axle to run; the rear drive axle is mechanically connected with the rear axle two-gear automatic transmission, a main speed reducer, a differential mechanism and a half shaft are arranged in the rear drive axle, the power transmitted by the transmission is transmitted to wheels, and the rear drive axle drives the two wheels of the rear axle to run; the working motor is mechanically connected with the hydraulic pump, and the hydraulic pump is in fluid flow connection with the hydraulic system to provide power for the working device to work.
In some embodiments, the driving motors are divided into a front shaft driving motor and a rear shaft driving motor.
In some embodiments, the motor controller is divided into a front axle motor controller and a rear axle motor controller.
In some embodiments, the two-speed automatic transmission is divided into a front axle two-speed automatic transmission and a rear axle two-speed automatic transmission, and the gear ratios of the gears of the front axle two-speed automatic transmission and the rear axle two-speed automatic transmission are different.
In some embodiments, the transmission controller is divided into a front axle transmission controller and a rear axle transmission controller.
In some embodiments, the power supply system is connected with the vehicle control unit, the state of charge of a battery of the power supply system is monitored, and the working state of the power supply system is controlled according to instruction information sent by the vehicle control unit.
In some embodiments, the front axle driving motor controller is connected with the vehicle control unit, and is used for the vehicle control unit to acquire the working condition state of the front axle driving motor and control the working state of the front axle motor according to the received instruction information sent by the vehicle control unit; the rear axle driving motor controller is connected with the vehicle control unit and used for collecting the working condition state of the rear axle driving motor by the vehicle control unit and controlling the working state of the rear axle motor according to the received instruction information sent by the vehicle control unit; and the working motor controller is connected with the vehicle control unit and used for collecting the working condition state of the working motor by the vehicle control unit and controlling the working state of the working motor according to the received instruction information sent by the vehicle control unit.
In some embodiments, the speed sensor is connected with the vehicle control unit, and the speed sensor collects the wheel rotating speed and transmits the wheel rotating speed to the vehicle control unit.
In some embodiments, the front axle automatic transmission controller is connected with the vehicle control unit, collects a gear signal of the front axle transmission and transmits the gear signal to the vehicle control unit, and receives a gear change signal sent by the vehicle control unit to switch the gear of the front axle automatic transmission; the rear axle automatic transmission controller is connected with the vehicle control unit, collects gear signals of the rear axle transmission and transmits the gear signals to the vehicle control unit, and receives gear change signals sent by the vehicle control unit to switch gears of the rear axle automatic transmission.
The invention has the advantages and effects that:
the power assembly of the pure electric loader is driven by the front shaft driving motor, the rear shaft driving motor and the two-gear transmission, replaces an internal combustion engine and a hydraulic torque converter with lower efficiency, is simple in structure and flexible in arrangement, and improves the transmission efficiency of the whole loader; the front shaft driving motor is mechanically connected with a front driving axle through a front shaft two-gear automatic transmission, and outputs power to drive front wheels to run; the rear shaft driving motor is mechanically connected with a rear drive axle through a rear shaft two-gear automatic transmission, and outputs power to drive rear wheels to run; the working motor is connected with the hydraulic pump and outputs power for the working device. The walking part adopts two walking motors with the same specification and model to replace an internal combustion engine, the two walking motors respectively drive the front shaft and the rear shaft, the working points of the motors can be timely and intelligently adjusted, the load rate of the motors can be increased, the efficiency of the motors is improved, the power performance of the whole loader can be enhanced, the working time of the loader is prolonged, and the maneuverability of the loader can be improved to a certain extent by double-shaft driving; in addition, the double-motor power assembly can also reduce the bus current of a high-voltage system, so that the energy utilization rate of the power assembly is improved, and the manufacturing cost of the motor is reduced; the working part uses the working motor to provide power for the hydraulic pump, so that the working device finishes working, the working pressure of the motor of the driving system can be effectively reduced, and the walking motor and the working motor are separately installed and independently controlled, so that the complexity of the design of a control system is reduced, the control is easy, and the manufacturing cost is reduced; the front shaft and the rear shaft are respectively provided with a two-gear automatic transmission, the transmission ratio of each gear of the transmission is different, the automatic switching of the gears can be intelligently realized according to the vehicle speed and the working condition, and the different gears of the front shaft and the rear shaft are combined to form a full-time four-wheel drive mode with various driving speeds so as to meet the requirements on the driving force and the vehicle speed under different working conditions.
Drawings
FIG. 1 is a structural diagram of a power assembly of a pure electric loader according to the present invention;
FIG. 2 is a diagram illustrating connection and electrical signal transmission of a power assembly of a pure electric loader according to the present invention;
fig. 3 is a structure diagram of a drive axle of a power assembly of the pure electric loader according to the invention.
In the drawings: 1. a rear drive axle; 2. a speed sensor; 3. a rear axle two-speed automatic transmission; 4. a rear axle drive motor; 5. a power supply system; 6. a front axle drive motor controller; 7. a front axle drive motor; 8. a front axle two-speed automatic transmission; 9. a front drive axle; 10. a hydraulic pump; 11. a working device; 12. a working motor; 13. a working motor controller; 14. a rear axle motor controller; 15. a front axle automatic transmission controller; 16. a hydraulic system; 17. a vehicle control unit; 18. a rear axle automatic transmission controller; 19. a half shaft; 20. a differential mechanism; 21. and a main speed reducer.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The pure electric loader power assembly disclosed by the invention is shown in attached figures 1, 2 and 3, and comprises a rear drive axle 1, a speed sensor 2, a rear axle two-gear automatic transmission 3, a rear axle drive motor 4, a power supply system 5, a front axle drive motor controller 6, a front axle drive motor 7, a front axle two-gear automatic transmission 8, a front drive axle 9, a hydraulic pump 10, a working device 11, a working motor 12, a working motor controller 13, a rear axle drive motor controller 14, a front axle automatic transmission controller 15, a hydraulic system 16, a whole vehicle controller 17, a rear axle automatic transmission controller 18, a half shaft 19, a differential 20 and a main reducer 21.
The assembly relation is as follows:
a power assembly of a pure electric loader comprises a rear drive axle 1, a speed sensor 2, a rear axle two-gear automatic transmission 3, a rear axle drive motor 4, a power supply system 5, a front axle drive motor controller 6, a front axle drive motor 7, a front axle two-gear automatic transmission 8, a front drive axle 9, a hydraulic pump 10, a working device 11, a working motor 12, a working motor controller 13, a rear axle drive motor controller 14, a front axle automatic transmission controller 15, a hydraulic system 16, a whole vehicle controller 17, a rear axle automatic transmission controller 18, a half shaft 19, a differential 20 and a main speed reducer 21.
The power supply system 5 is respectively electrically connected with the front shaft driving motor controller 6, the rear shaft driving motor controller 14 and the working motor controller 13, electric energy is provided for the motor through the motor controllers, and the motor converts the electric energy into mechanical energy to enable the loader to walk or work; the power supply system 5 is electrically connected with the vehicle control unit 17 and is configured to send a battery remaining capacity state of the power supply system 5 to the vehicle control unit 17 and control a working state of the power supply system 5 according to the received instruction information sent by the vehicle control unit 17.
One end of the front axle motor controller 6 is electrically connected with the vehicle control unit 17, and the vehicle control unit 17 is used for collecting the working condition state of the front axle driving motor 7 and controlling the working state of the front axle driving motor 7 according to the received instruction information sent by the vehicle control unit 17; the other end of the front shaft driving motor controller 6 is electrically connected with a front shaft driving motor 7, and the front shaft driving motor 7 converts electric energy into mechanical energy; the mechanical energy generated by the front axle driving motor 7 is transmitted to the front driving axle 9 through the front axle two-gear automatic transmission 8, a main speed reducer 21 and a differential 20 and a half axle 19 are contained in the front driving axle 9, and finally the power generated by the front axle driving motor 7 is transmitted to the driving wheels.
One end of the rear axle motor controller 14 is electrically connected with the vehicle control unit 17, and is used for collecting the working condition state of the rear axle driving motor 4 by the vehicle control unit 17 and controlling the working state of the rear axle driving motor 4 according to the received instruction information sent by the vehicle control unit 17; the other end of the rear axle driving motor controller 14 is electrically connected with the rear axle driving motor 4, and the rear axle driving motor 4 converts the electric energy into mechanical energy; the mechanical energy generated by the rear axle driving motor 4 is transmitted to the rear drive axle 1 through the rear axle two-gear automatic transmission 3, the rear drive axle 1 comprises a main speed reducer 21, a differential 20 and a half axle 19, and finally the power generated by the rear axle driving motor 4 is transmitted to the driving wheels.
One end of the working motor controller 13 is electrically connected with the vehicle control unit 17, and is used for collecting the working condition state of the working motor 12 by the vehicle control unit 17 and controlling the working state of the working motor 12 according to the received instruction information sent by the vehicle control unit 17; the other end of the working motor controller 13 is electrically connected with a working motor 12, the working motor 12 is mechanically connected with a hydraulic pump 10, and the hydraulic pump 10 is in fluid flow connection with a hydraulic system 16, so that the working device 11 works.
The vehicle control unit 17 is electrically connected with the wheel speed sensor 2, the front axle automatic transmission controller 15 and the front axle automatic transmission controller 18, the vehicle control unit 17 receives information collected by the sensors, the motor controller, the transmission controller and the power system, the vehicle control unit 17 calculates reasonable required torque according to the received information, a driving motor control strategy is formulated, an operation instruction is generated, the operation instruction is transmitted to the controllers, the sensors and the power system, and gear switching of the transmission, motor torque output and power system voltage output are intelligently achieved according to the vehicle speed and working conditions.
The design principle is as follows
The internal combustion engine has high output power, but the rotating speed is high, the output torque is small, and the internal combustion engine needs to be converted into a power source with high torque and low rotating speed for the traveling device to use, so a hydraulic torque converter is generally arranged between the internal combustion engine and the transmission of the loader. The hydraulic torque converter can realize the conversion of liquid kinetic energy and mechanical energy, can realize the increase of output torque by 5-6 times, can perform stepless speed regulation, and can also prevent the engine from flameout when the load is overlarge. However, research has shown that torque converters are extremely inefficient at low speed and heavy duty operation, while loaders require the engine to select higher loader power during combined operation, resulting in a longer time in the inefficient region. In the process of one shoveling operation, the transmission efficiency of the hydraulic torque converter only works in a high efficiency region of 75-83.5% in less than 50% of the time. The traveling part is driven by a front shaft driving motor, a rear shaft driving motor and a two-gear transmission, the output torque of the driving motor is large when the rotating speed is low, the transmission can expand the torque of the driving wheel to meet the torque requirement of the shovel loader operation of the loader, an internal combustion engine and a hydraulic torque converter with lower efficiency are replaced by the transmission, the structure is simple, the arrangement is flexible, and the transmission efficiency of the whole loader is improved by over 80 percent.
The front and rear axle two-gear automatic transmission has different gear ratios of all gears, and different gears are combined to form a full-time four-wheel drive mode with various running speeds so as to meet the requirements on driving force and vehicle speed under different working conditions. The method comprises the steps of calculating the required torque of the current vehicle by taking the driving requirement of a driver as a target and combining the running condition and the vehicle information of the current vehicle, and judging and identifying which working mode of a front and rear shaft motor and a two-gear automatic transmission combination meets the required torque of the whole vehicle under the state according to the calculation result of the required torque of the whole vehicle. The automatic gear switching is intelligently realized by sending a torque demand instruction and a transmission gear change instruction to the front motor and the rear motor, so that the optimal working point under the current demand torque is found while the vehicle follows the driving intention of a driver, and the motors work in a high efficiency area as much as possible. When the type selection and parameter matching of the motor and the transmission are carried out, the output torque of the loader during shoveling operation at the speed of 2-3 km/h can meet the output torque of the traditional loader in a vector step state.
The weight of the whole machine is 4010kg, the rated load is 1000kg, the maximum traction is 42.5KN, the maximum speed is 28km/h, the radius of the tire is 430mm, the air resistance coefficient is 0.65, and the windward area is 7m2The rolling resistance coefficient of the loader is 0.12 during operation, and the air resistance is 0.06 under the transportation working condition. And matching the parameters of the driving motor according to the working condition of the driving motor, so that the high-speed transportation running and shoveling operation tasks of the loader are met.
The driving motor is mainly responsible for providing the traction power for the loader in the process of shoveling and loading operation and the process of high-speed transportation, and because the maximum resistance is generated when a bucket of the loader inserts materials when the loader carries out shoveling and loading operation, the power of the loader during transportation at the highest speed and the power of the loader during overcoming the maximum traction in the process of low-speed operation are both met when the power of the motor is calculated.
(1) The loader is in high-speed transportation working condition
The loader has the capacity of carrying out medium and long distance transportation at a higher speed, the speed of the ordinary loader during operation is lower than the highest speed, and the rated power of the motor during high-speed transportation is calculated by driving at the highest speed under the full-load working condition of the loader, so that the loader can be ensured to have certain backup power, and the power requirements under the driving working conditions of climbing and the like of the loader can be ensured. In this case, the driving motor power is proportional to the traveling vehicle speed and the load mass, that is, the higher the traveling vehicle speed and the load mass, the larger the required driving motor power. When the loader runs at the highest speed, rolling resistance and air resistance are mainly required to be overcome, and the expression of the peak power of the motor under the high-speed transportation working condition is as follows:
carry-in loader data, calculated as: running resistance F to be overcome by a loader in a transport process at maximum speedr3114.54N, rated power P of driving motor when loader is transported at maximum speed1＝22.80KW。
(2) The loader is in the working condition of shovel loading operation
When the loader is in the shovel operation working condition, the peak power of the motor is calculated through the maximum traction force, and at the moment, the expression of the peak power in the shovel operation is as follows:
substituting the data into a formula to obtain Ff＝4715.76N
Maximum traction force F of loadermax＝42500N；
Rolling resistance F at the time of insertion workfAnd maximum traction force FmaxSubstituting into formula to obtain P2＝45.9KW。
The selection of the power parameters of the motors is to ensure that the peak power requirement of the loader is met and certain margin is reserved, so that the peak power P of the total output of the two motorsmax total＝45.9(1+10％)≈50KW。
The expression of the peak power of the driving motor and the rated power thereof is as follows:
Pmax total＝λPe total
In the formula, lambda is motor overload coefficient, and lambda is 2, Pe totalIs the sum of the rated powers of two identical motors.
Substituting the peak power and the motor overload coefficient into a formula to obtain the rated power P of the motore total25KW, so that the rated power of a single motor is Pe12.5KW, peak power Pmax totalWhen the loader carries out shoveling operation at 3km/h, the maximum traction force of 42.5KN can be overcome.
The hydraulic working pump adopted by the hydraulic system of the working device of the crude fuel oil loader has the rated discharge capacity of 50mL/r, the rated pressure of 16MPa, the rated rotating speed of 2000r/min and the volumetric efficiency of 0.9.
Flow Q required to be output by hydraulic working pump under rated working condition1The expression of (a) is:
power P required to be output by hydraulic working pump under rated working conditionPump and method of operating the sameThe expression is as follows:
considering that the working motor drives the hydraulic working pump to have certain kinetic energy loss in the working process, the power of the working motor is larger than the output power of the hydraulic working pump, and the output power P of the working motor under the rated working conditionWork byThe expression of (a) is:
Pwork by＝(1.15～1.2)PPump and method of operating the same (3.20)
PWork max＝λPWork by (3.21)
Calculating Q according to formula1＝100L/min，PPump and method of operating the same＝26.67KW，PWork by＝31KW，PWork max62 KW. And selecting a permanent magnet motor with the rated power of 37KW as a driving motor according to the motor power grade table.
For the underground high-gas-concentration operation environment, the traditional loader is easy to have the phenomena of oil leakage and oil leakage; the discharged tail gas needs to be filtered by water and double-layer filtered by active carbon to remove sparks, and the design requirement is high; the explosion-proof modification of the traditional internal combustion engine relates to wide range (diesel engine, electric control system, oil tank, tightness, tail gas emission and the like), great difficulty and increased cost. The pure electric loader has no tail gas emission, is easy to realize explosion-proof modification on an electrical system, can greatly improve the safety of underground operation of the loader, and has low modification cost.
The foregoing description is of the embodiments of the invention and the technical principles applied thereto, and the functional effects produced by the changes made in the conception of the invention are not beyond the spirit of the description and the drawings, and are within the scope of the invention.
Claims (9)
1. The utility model provides a pure electric loader power assembly, includes vehicle control unit, electrical power generating system, driving motor, machine controller, work motor, work machine controller, hydraulic pump, hydraulic system, equipment, two grades of automatic gearbox, transaxle, and the transaxle contains main reducer, differential mechanism and semi-axis, speed sensor, transmission controller, its characterized in that: the power system is respectively connected with the motor controllers of the front shaft and the rear shaft and the working motor controller, the motor controllers are respectively connected with the driving motors which are respectively controlled, the working motor controller is connected with the working motor, the driving motor is mechanically connected with the two-gear automatic transmission and the drive axle, and the drive axle is respectively a front drive axle and a rear drive axle; the front drive axle is mechanically connected with the front axle two-gear automatic transmission, a main speed reducer, a differential mechanism and a half shaft are arranged in the front drive axle, the power transmitted by the transmission is transmitted to wheels, and the front drive axle drives the two wheels of the front axle to run; the rear drive axle is mechanically connected with the rear axle two-gear automatic transmission, a main speed reducer, a differential mechanism and a half shaft are arranged in the rear drive axle, the power transmitted by the transmission is transmitted to wheels, and the rear drive axle drives the two wheels of the rear axle to run; the working motor is mechanically connected with the hydraulic pump, and the hydraulic pump is in fluid flow connection with the hydraulic system to provide power for the working device to work.
2. The power assembly of the pure electric loader of claim 1, characterized in that: the driving motor is divided into a front shaft driving motor and a rear shaft driving motor.
3. The power assembly of the pure electric loader of claim 1, characterized in that: the motor controller is divided into a front shaft motor controller and a rear shaft motor controller.
4. The power assembly of the pure electric loader of claim 1, characterized in that: the two-gear automatic transmission comprises a front-shaft two-gear automatic transmission and a rear-shaft two-gear automatic transmission, and the transmission ratios of the gears of the front-shaft two-gear automatic transmission and the rear-shaft two-gear automatic transmission are different.
5. The power assembly of the pure electric loader of claim 1, characterized in that: the transmission controller is divided into a front axle transmission controller and a rear axle transmission controller.
6. The power assembly of the pure electric loader of claim 1, characterized in that: the power supply system is connected with the vehicle control unit, the charge state of a battery of the power supply system is monitored, and the working state of the power supply system is controlled according to instruction information sent by the vehicle control unit.
7. The power assembly of the pure electric loader of claim 1, characterized in that: the front axle driving motor controller is connected with the vehicle control unit and used for collecting the working condition state of the front axle driving motor by the vehicle control unit and controlling the working state of the front axle motor according to the received instruction information sent by the vehicle control unit; the rear axle driving motor controller is connected with the vehicle control unit and used for collecting the working condition state of the rear axle driving motor by the vehicle control unit and controlling the working state of the rear axle motor according to the received instruction information sent by the vehicle control unit; and the working motor controller is connected with the vehicle control unit and used for collecting the working condition state of the working motor by the vehicle control unit and controlling the working state of the working motor according to the received instruction information sent by the vehicle control unit.
8. The power assembly of the pure electric loader of claim 1, characterized in that: the speed sensor is connected with the vehicle control unit, and the speed sensor acquires the rotating speed of the vehicle and transmits the rotating speed to the vehicle control unit.
9. The power assembly of the pure electric loader of claim 1, characterized in that: the front axle automatic transmission controller is connected with the vehicle control unit, collects gear signals of the front axle transmission and transmits the gear signals to the vehicle control unit, and receives gear change signals sent by the vehicle control unit to switch gears of the front axle automatic transmission; the rear axle automatic transmission controller is connected with the vehicle control unit, collects gear signals of the rear axle transmission and transmits the gear signals to the vehicle control unit, and receives gear change signals sent by the vehicle control unit to switch gears of the rear axle automatic transmission.
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| CN202011585572.2A CN112572122A (en) | 2020-12-28 | 2020-12-28 | Power assembly of pure electric loader |
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| CN202011585572.2A CN112572122A (en) | 2020-12-28 | 2020-12-28 | Power assembly of pure electric loader |
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| CN112572122A true CN112572122A (en) | 2021-03-30 |
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