A thermal balance test bench and method for a wheel hub electro-hydraulic coupling drive device

Abstract

The present invention provides a wheel hub electro-hydraulic coupling drive device thermal balance test bench, comprising a base, a fuel tank is fixedly connected to one side of the top surface of the base, a liquid drive supply structure, a liquid drive dynamometer structure, and an electric drive dynamometer structure are arranged on the other side of the top surface of the base, a control structure is fixedly connected to the rear side of the fuel tank, and the liquid drive supply structure, the liquid drive dynamometer structure, the electric drive dynamometer structure, the electric drive supply structure, the first monitoring structure, the second monitoring structure, and the third monitoring structure are electrically connected to the control structure. The present invention can verify the thermal balance characteristics of the wheel hub electro-hydraulic coupling drive device through standardized test methods and test steps, and has the test test, data collection and storage functions of the temperature, speed and torque of the subunit and coupling unit of the electro-hydraulic coupling drive device.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle electro-hydraulic coupling drive, and in particular relates to a thermal balance test bench and method for a wheel hub electro-hydraulic coupling drive device. Background Art

[0002] The wheel hub drive technology integrates the power device, transmission device and brake device into the wheel hub, greatly simplifies the mechanical part of the vehicle, has the advantages of high integration, small size and high power density, and is a new direction for the development of vehicle drive technology. Generally, the wheel hub drive assembly is driven by an outer rotor motor, and the rotor is connected to the wheel hub. Although there is a lot of space inside the stator, it is wasted. Patent ZL2014102549047 designs a cooling element for a wheel hub drive device and a wheel hub drive device, which is a wheel hub motor drive device with an outer rotor and an inner stator, and the internal space of the stator is not utilized. Patent ZL2022104171742 proposes a wheel hub electro-hydraulic composite drive assembly and control method, which effectively utilizes the internal space of the motor, adds hydraulic drive elements without increasing the system volume, and improves the operating efficiency of the drive assembly. However, when the vehicle is running at high speed and high load conditions, the stator winding heats up seriously. Due to the high spatial integration, the heat dissipation and cooling scheme of the coupling drive device has not been experimentally verified and cannot be applied to real life. In summary, although a wheel hub electro-hydraulic coupling drive device has been proposed, there is a lack of relevant performance verification equipment, so the reliability and practicality of the drive device urgently need to be verified by a matching test device. Summary of the invention

[0003] The object of the present invention is to provide a wheel hub electro-hydraulic coupling drive device thermal balance test bench and method to solve the above problems.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A wheel hub electro-hydraulic coupling drive device thermal balance test bench comprises a base, one side of the top surface of the base is fixedly connected to an oil tank, and the other side of the top surface of the base is provided with a liquid drive supply structure, a liquid drive dynamometer structure, and an electric drive dynamometer structure;

[0006] The liquid inlet end of the liquid drive liquid supply structure is communicated with the oil tank, the liquid outlet end of the liquid drive liquid supply structure is communicated with the liquid inlet end of the liquid drive dynamometer structure, a relief valve for constant pressure is communicated in the middle of the communication pipeline between the liquid outlet end of the liquid drive liquid supply structure and the liquid inlet end of the liquid drive dynamometer structure, and a first monitoring structure is provided on the pipeline communicating between the relief valve and the liquid drive dynamometer structure;

[0007] The liquid outlet of the liquid-driven dynamometer structure is connected to the liquid inlet of the electric-driven dynamometer structure through a first one-way valve, and a second monitoring structure is provided on the pipeline connecting the liquid outlet of the liquid-driven dynamometer structure and the first one-way valve;

[0008] The liquid outlet of the electric drive dynamometer structure is connected to the oil tank, a first air cooling structure for dissipating heat from the pipeline connecting the electric drive dynamometer structure and the oil tank is fixedly connected to the oil tank, and a third monitoring structure is provided on the pipeline connecting the liquid outlet of the electric drive dynamometer structure and the oil tank;

[0009] The top surface of the oil tank is fixedly connected to an electric drive liquid supply structure, the liquid inlet end of the electric drive liquid supply structure is connected to the oil tank, and the liquid outlet end of the electric drive liquid supply structure is connected to the liquid inlet end of the electric drive dynamometer structure through a second one-way valve;

[0010] A control structure is fixedly connected to the rear side of the oil tank, and the liquid drive supply structure, the liquid drive dynamometer structure, the electric drive dynamometer structure, the electric drive supply structure, the first monitoring structure, the second monitoring structure, and the third monitoring structure are electrically connected to the control structure.

[0011] Preferably, the liquid drive and liquid supply structure includes a liquid drive motor, a first speed torque sensor, and a hydraulic pump;

[0012] The hydraulic drive motor, the first speed torque sensor, and the hydraulic pump are arranged axially from front to back on one side of the base, the output shaft of the hydraulic drive motor is connected to one end of the first speed torque sensor, and the other end of the first speed torque sensor is connected to the power input end of the hydraulic pump;

[0013] The liquid outlet of the oil tank is connected to the liquid inlet of the hydraulic pump through a first connecting pipe, and the liquid outlet of the hydraulic pump is connected to the liquid inlet of the liquid drive dynamometer structure through a second connecting pipe, the overflow valve and a third connecting pipe in sequence;

[0014] The first monitoring structure is connected to the middle part of the third connecting pipe, and the first monitoring structure is used to monitor the flow rate, pressure and temperature of the inlet oil of the liquid drive dynamometer structure.

[0015] Preferably, the hydraulic drive dynamometer structure comprises a hydraulic motor, a second speed torque sensor, and a first dynamometer;

[0016] The hydraulic motor, the second speed torque sensor, and the first dynamometer are axially arranged from the back to the front in the middle of the top surface of the base, the power output end of the hydraulic motor is connected to one end of the second speed torque sensor, and the other end of the second speed torque sensor is connected to the first dynamometer;

[0017] The liquid outlet end of the third connecting pipe is connected to the liquid inlet end of the hydraulic motor;

[0018] The fluid outlet of the hydraulic motor is connected to the fluid inlet of the electric drive dynamometer structure through a fourth connecting pipe, and the second monitoring structure and the first one-way valve are connected to the fourth connecting pipe in sequence.

[0019] Preferably, the electric drive dynamometer structure comprises a second dynamometer, a third speed torque sensor, and an electric drive motor, wherein the output shaft of the electric drive motor is connected to one end of the third speed torque sensor, and the other end of the third speed torque sensor is connected to the second dynamometer;

[0020] The liquid outlet of the hydraulic motor is connected to the liquid inlet of the electric drive motor through a fourth connecting pipe, and the liquid outlet of the electric drive motor is connected to the liquid inlet of the oil tank through a sixth connecting pipe;

[0021] The sixth connecting pipe is arranged for heat exchange with the first air cooling structure, and the third monitoring structure is arranged in communication with the middle part of the sixth connecting pipe;

[0022] The liquid outlet of the electric drive liquid supply structure is communicated with the liquid inlet of the electric drive dynamometer structure through a second one-way valve.

[0023] Preferably, the liquid outlet end of the electric drive liquid supply structure is connected to the liquid inlet end of the fifth connecting tube through the seventh connecting tube, the liquid outlet ends of the seventh connecting tube and the fourth connecting tube are connected to the liquid inlet end of the fifth connecting tube through a three-way tube, and the liquid outlet end of the fifth connecting tube is connected to the liquid inlet end of the electric drive motor.

[0024] Preferably, the oil leakage port of the hydraulic pump is connected to the oil outlet of the relief valve via a first leakage pipe;

[0025] The oil leakage port of the hydraulic motor is connected to the oil outlet of the relief valve via a second leakage pipe;

[0026] The oil outlet of the overflow valve is connected to the oil inlet of the oil tank through a leakage liquid return pipe, and a second air cooling structure is provided on the leakage liquid return pipe.

[0027] A wheel hub electro-hydraulic coupling drive device thermal balance test method, based on the above-mentioned wheel hub electro-hydraulic coupling drive device thermal balance test bench, comprises the following steps:

[0028] The oil in the cooling device is kept at normal temperature;

[0029] According to different experimental needs, the corresponding structure is started through the control structure to start the experiment;

[0030] When the oil in the device reaches thermal equilibrium, stop the experiment;

[0031] Collect and store relevant data.

[0032] Preferably, when a liquid drive experiment is performed, the liquid drive supply structure and the liquid drive dynamometer structure are started by the control structure;

[0033] Adjust the overflow valve so that the oil pressure measured by the first monitoring structure meets the experimental requirements;

[0034] Adjust the load in the liquid drive dynamometer structure to meet the experimental requirements;

[0035] The liquid drive supply structure draws the oil from the oil tank, and the oil passes through the liquid drive supply structure, the liquid drive dynamometer structure, and the electric drive dynamometer structure in sequence, and then returns to the oil tank through the first air cooling structure;

[0036] When the temperature measured by the second monitoring structure stabilizes, the oil in the device reaches thermal equilibrium.

[0037] Preferably, when the electric drive experiment is carried out, the electric drive dynamometer structure and the electric drive fluid supply structure are started by the control structure;

[0038] Adjust the speed of the electric drive dynamometer structure to meet the experimental requirements;

[0039] Adjust the load in the electric drive dynamometer structure to meet the experimental needs;

[0040] The electric drive fluid supply structure draws the oil from the oil tank, and the oil passes through the electric drive fluid supply structure and the electric drive dynamometer structure in sequence, and then returns to the oil tank through the first air cooling structure;

[0041] When the temperature measured by the third monitoring structure stabilizes, the oil in the device reaches thermal equilibrium.

[0042] Preferably, when conducting a coupling experiment between a liquid drive unit and an electric drive unit, the liquid drive supply structure, the liquid drive dynamometer structure, the electric drive dynamometer structure, and the electric drive supply structure are started by controlling the control structure;

[0043] Adjust the overflow valve so that the oil pressure measured by the first monitoring structure meets the experimental requirements;

[0044] Adjust the load in the liquid drive dynamometer structure to meet the experimental requirements;

[0045] Adjust the speed of the electric drive dynamometer structure to meet the experimental requirements;

[0046] Adjust the load in the electric drive dynamometer structure to meet the experimental needs;

[0047] When the temperatures measured by the second monitoring structure and the third monitoring structure are both stable, the oil in the device reaches thermal equilibrium.

[0048] Compared with the prior art, the present invention has the following advantages and technical effects:

[0049] The test method and test bench of the present invention can not only realize the test verification of the thermal balance characteristics of independent modules such as the liquid drive unit and the electric drive unit, but also complete the verification of the temperature rise characteristics under the coupling of the liquid drive unit and the electric drive unit. In addition, according to the free combination of different oil pipes and oil channels in the test bench, different lubrication and cooling circuit designs of the electric drive unit and the liquid drive unit can be verified. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0051] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0052] Figure 2 It is a front view of the present invention;

[0053] Figure 3 It is a schematic diagram of the local structure of the present invention;

[0054] Figure 4 This is a diagram of the experimental results of Example 1 of the present invention;

[0055] Figure 5 This is a diagram of the experimental results of Example 2 of the present invention;

[0056] Figure 6 This is a diagram of the experimental results of Example 3 of the present invention;

[0057] Among them, 1. base; 2. oil tank; 3. liquid drive supply structure; 4. liquid drive dynamometer structure; 5. electric drive dynamometer structure; 6. electric drive supply structure; 7. first connecting pipe; 8. second connecting pipe; 9. overflow valve; 10. first leakage pipe; 11. third connecting pipe; 12. fourth connecting pipe; 13. second leakage pipe; 14. leakage liquid reflux pipe; 15. first one-way valve; 16. three-way pipe; 17. fifth connecting pipe; 18. sixth connecting pipe; 19. seventh connecting pipe; 20. second one-way valve; 21. first air cooling structure; 22. control structure; 23. second air cooling structure; 301. liquid drive motor; 302. first speed torque sensor; 303. hydraulic pump; 401. first dynamometer; 402. second speed torque sensor; 403. hydraulic motor; 501. second dynamometer; 502. third speed torque sensor; 503. electric drive motor. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] Reference Figures 1 to 6 As shown, the present invention discloses a wheel hub electro-hydraulic coupling drive device thermal balance test bench, comprising a base 1, a top surface of the base 1 is fixedly connected to an oil tank 2, and the other side of the top surface of the base 1 is provided with a liquid drive supply structure 3, a liquid drive dynamometer structure 4, and an electric drive dynamometer structure 5;

[0061] A liquid level gauge is installed on the oil tank 2 to measure the liquid level of the hydraulic oil in the oil tank 2 and transmit the liquid level signal to the control structure, so that the liquid level in the oil tank can be remotely monitored.

[0062] The liquid inlet end of the liquid drive liquid supply structure 3 is connected to the oil tank 2, the liquid outlet end of the liquid drive liquid supply structure 3 is connected to the liquid inlet end of the liquid drive dynamometer structure 4, and the middle of the connecting pipeline between the liquid outlet end of the liquid drive liquid supply structure 3 and the liquid inlet end of the liquid drive dynamometer structure 4 is connected to a relief valve 9 for constant pressure, and the pipeline connecting the relief valve 9 and the liquid drive dynamometer structure 4 is provided with a first monitoring structure; the first monitoring structure includes an oil flow sensor A1, a pressure sensor B1, and a temperature sensor C1;

[0063] The liquid outlet of the liquid-driven dynamometer structure 4 is connected to the liquid inlet of the electric-driven dynamometer structure 5 through the first one-way valve 15, and a second monitoring structure is provided on the pipeline connecting the liquid outlet of the liquid-driven dynamometer structure 4 and the first one-way valve 15; the second monitoring structure includes an oil flow sensor A2, a pressure sensor B2, and a temperature sensor C2;

[0064] The liquid outlet of the electric drive dynamometer structure 5 is connected to the oil tank 2. The oil tank 2 is fixed with a first air cooling structure 21 for dissipating heat from the pipeline connecting the electric drive dynamometer structure 5 and the oil tank 2. A third monitoring structure is provided on the pipeline connecting the liquid outlet of the electric drive dynamometer structure 5 and the oil tank 2. The third monitoring structure includes an oil flow sensor A3, a pressure sensor B3, and a temperature sensor C3.

[0065] The top surface of the oil tank 2 is fixedly connected with an electric drive liquid supply structure 6, the liquid inlet end of the electric drive liquid supply structure 6 is connected with the oil tank 2, and the liquid outlet end of the electric drive liquid supply structure 6 is connected with the liquid inlet end of the electric drive dynamometer structure 5 through a second one-way valve 20;

[0066] A control structure 22 is fixedly connected to the rear side of the oil tank 2, and the liquid drive supply structure 3, the liquid drive dynamometer structure 4, the electric drive dynamometer structure 5, the electric drive supply structure 6, the first monitoring structure, the second monitoring structure, and the third monitoring structure are electrically connected to the control structure 22. The control structure 22 is a data acquisition and control system.

[0067] Preferably, the relief valve 9 has three ports, an oil inlet, an oil outlet, and a leakage port. The leakage port and the oil outlet are combined to form a pipeline. The leakage pipes of the hydraulic pump and the hydraulic motor are connected to this pipeline, which is an integrated oil channel with multiple porous connections.

[0068] The test method and test bench of the present invention can not only realize the test verification of the thermal balance characteristics of independent modules such as the liquid drive unit and the electric drive unit, but also complete the verification of the temperature rise characteristics under the coupling of the liquid drive unit and the electric drive unit. In addition, according to the free combination of different oil pipes and oil channels in the test bench, different lubrication and cooling circuit designs of the electric drive unit and the liquid drive unit can be verified.

[0069] Further optimizing the scheme, the liquid drive supply structure 3 includes a liquid drive motor 301, a first speed torque sensor 302, and a hydraulic pump 303;

[0070] The hydraulic drive motor 301, the first speed torque sensor 302, and the hydraulic pump 303 are arranged axially from front to back on one side of the base 1, the output shaft of the hydraulic drive motor 301 is connected to one end of the first speed torque sensor 302, and the other end of the first speed torque sensor 302 is connected to the power input end of the hydraulic pump 303;

[0071] The liquid outlet of the oil tank 2 is connected to the liquid inlet of the hydraulic pump 303 through the first connecting pipe 7, and the liquid outlet of the hydraulic pump 303 is connected to the liquid inlet of the liquid drive dynamometer structure 4 through the second connecting pipe 8, the overflow valve 9 and the third connecting pipe 11 in sequence;

[0072] The first monitoring structure is connected to the middle of the third connecting pipe 11 , and is used to monitor the flow rate, pressure and temperature of the inlet oil of the liquid drive dynamometer structure 4 .

[0073] Further optimizing the scheme, the hydraulic drive dynamometer structure 4 includes a hydraulic motor 403, a second speed torque sensor 402, and a first dynamometer 401;

[0074] The hydraulic motor 403, the second speed torque sensor 402, and the first dynamometer 401 are axially arranged from the back to the front in the middle of the top surface of the base 1, the power output end of the hydraulic motor 403 is connected to one end of the second speed torque sensor 402, and the other end of the second speed torque sensor 402 is connected to the first dynamometer 401;

[0075] The liquid outlet end of the third connecting pipe 11 is connected to the liquid inlet end of the hydraulic motor 403;

[0076] The fluid outlet of the hydraulic motor 403 is connected to the fluid inlet of the electric drive dynamometer structure 5 through the fourth connecting pipe 12 , and the second monitoring structure and the first one-way valve 15 are connected to the fourth connecting pipe 12 in sequence.

[0077] Further optimizing the scheme, the electric drive dynamometer structure 5 includes a second dynamometer 501, a third speed torque sensor 502, and an electric drive motor 503, wherein the output shaft of the electric drive motor 503 is connected to one end of the third speed torque sensor 502, and the other end of the third speed torque sensor 502 is connected to the second dynamometer 501;

[0078] The liquid outlet of the hydraulic motor 403 is connected to the liquid inlet of the electric drive motor 503 through the fourth connecting pipe 12, and the liquid outlet of the electric drive motor 503 is connected to the liquid inlet of the oil tank 2 through the sixth connecting pipe 18;

[0079] The sixth connecting pipe 18 is arranged for heat exchange with the first air cooling structure 21, and the third monitoring structure is arranged in communication with the middle part of the sixth connecting pipe 18;

[0080] The liquid outlet of the electric drive liquid supply structure 6 is communicated with the liquid inlet of the electric drive dynamometer structure 5 through the second one-way valve 20 .

[0081] To further optimize the solution, the liquid outlet end of the electric drive liquid supply structure 6 is connected to the liquid inlet end of the fifth connecting tube 17 through the seventh connecting tube 19, the liquid outlet ends of the seventh connecting tube 19 and the fourth connecting tube 12 are connected to the liquid inlet end of the fifth connecting tube 17 through the three-way tube 16, and the liquid outlet end of the fifth connecting tube 17 is connected to the liquid inlet end of the electric drive motor 503.

[0082] In a further optimized solution, the oil leakage port of the hydraulic pump 303 and the oil outlet of the relief valve 9 are connected via a first leakage pipe 10;

[0083] The oil leakage port of the hydraulic motor 403 is connected to the oil outlet of the relief valve 9 via a second leakage pipe 13;

[0084] The oil outlet of the overflow valve 9 is connected to the oil inlet of the oil tank 2 via a leakage liquid return pipe 14 , and a second air cooling structure 23 is provided on the leakage liquid return pipe 14 .

[0085] A thermal balance test method for a wheel hub electro-hydraulic coupling drive device comprises the following steps:

[0086] The oil in the cooling device is kept at normal temperature;

[0087] According to different experimental needs, the corresponding structure is started by the control structure 22 to start the experiment;

[0088] When the oil in the device reaches thermal equilibrium, stop the experiment;

[0089] Collect and store relevant data.

[0090] To further optimize the scheme, when the liquid drive experiment is carried out, the liquid drive supply structure 3 and the liquid drive dynamometer structure 4 are started by the control structure 22;

[0091] Adjust the overflow valve 9 so that the oil pressure measured by the first monitoring structure reaches the experimental requirement;

[0092] Adjust the load in the liquid drive dynamometer structure 4 to meet the experimental requirements;

[0093] The liquid drive supply structure 3 draws the oil from the oil tank 2, and the oil passes through the liquid drive supply structure 3, the liquid drive dynamometer structure 4, and the electric drive dynamometer structure 5 in sequence, and then returns to the oil tank 2 through the first air cooling structure 21;

[0094] When the temperature measured by the second monitoring structure stabilizes, the oil in the device reaches thermal equilibrium.

[0095] To further optimize the scheme, when the electric drive experiment is carried out, the electric drive dynamometer structure 5 and the electric drive fluid supply structure 6 are started by the control structure 22;

[0096] Adjust the speed of the electric drive dynamometer structure 5 to meet the experimental requirements;

[0097] Adjust the load in the electric drive dynamometer structure 5 to meet the experimental requirements;

[0098] The electric drive liquid supply structure 6 draws the oil from the oil tank 2, and the oil passes through the electric drive liquid supply structure 6 and the electric drive dynamometer structure 5 in sequence, and then returns to the oil tank 2 through the first air cooling structure 21;

[0099] When the temperature measured by the third monitoring structure stabilizes, the oil in the device reaches thermal equilibrium.

[0100] To further optimize the scheme, when conducting a coupling experiment between the liquid drive unit and the electric drive unit, the liquid drive supply structure 3, the liquid drive dynamometer structure 4, the electric drive dynamometer structure 5, and the electric drive supply structure 6 are started by controlling the control structure 22;

[0101] Adjust the overflow valve 9 so that the oil pressure measured by the first monitoring structure reaches the experimental requirement;

[0102] Adjust the load in the liquid drive dynamometer structure 4 to meet the experimental requirements;

[0103] Adjust the speed of the electric drive dynamometer structure 5 to meet the experimental requirements;

[0104] Adjust the load in the electric drive dynamometer structure 5 to meet the experimental requirements;

[0105] When the temperatures measured by the second monitoring structure and the third monitoring structure are both stable, the oil in the device reaches thermal equilibrium.

[0106] The test procedure of the present invention is as follows:

[0107] 1. The test steps of the liquid drive unit are as follows:

[0108] a) For the coolant drive unit, the test starts after the oil temperature Ti of the temperature sensor C1 is the same as the oil temperature Ty of the temperature sensor C2 (normal temperature state);

[0109] b) the data acquisition and control system starts the hydraulic drive motor 301;

[0110] c) Adjust the overflow valve 9 and the pressure of the pressure sensor B1 to Py; set the load of the first dynamometer 401 to My; (My = 20 / 40 / 60 / 80 N·m)

[0111] d) If the oil temperature Ty of temperature sensor C2 changes by less than 0.2°C within two minutes, it is judged that thermal equilibrium is reached. If this condition is met, the experiment ends;

[0112] e) Data acquisition and control system stores all experimental data.

[0113] 2. The test steps of the electric drive unit are as follows:

[0114] a) Cool the electric drive unit and start the test after making the oil temperature Tj of temperature sensor C1 equal to the oil temperature Td of temperature sensor C3 (normal temperature state);

[0115] b) The data acquisition and control system starts the electric drive motor 503 and the electric drive liquid supply structure 6;

[0116] c) setting the speed of the electric drive motor 503 to nd, and setting the load of the second dynamometer 501 to Md;

[0117] (Md=20 / 40 / 60 / 80N·m)

[0118] d) If the oil temperature Td of temperature sensor C3 changes by less than 0.2°C within two minutes, it is judged that thermal equilibrium is reached. If this condition is met, the experiment ends;

[0119] e) Data acquisition and control system stores all experimental data.

[0120] 3. The test steps of the liquid-electric coupling unit are as follows:

[0121] a) Cool the test device and start the test after the oil temperature Tj of temperature sensor C1 and the oil temperature Td of temperature sensor C3 are the same (normal temperature state);

[0122] b) The data acquisition and control system starts the electric drive motor and the hydraulic drive motor at the same time;

[0123] c) Adjust the overflow valve and the pressure of the pressure sensor B1 to Py; set the load of the dynamometer A to My; set the speed of the electric drive motor to nd, and set the load of the dynamometer B to Md;

[0124] d) If the changes of the oil temperature Ty of the temperature sensor C2 and the oil temperature Td of the temperature sensor C3 are both less than 0.2°C within two minutes, it is judged that thermal equilibrium is reached. If this condition is met, the experiment ends;

[0125] e) Data acquisition and control system stores all experimental data.

[0126] The oil supply of the hydraulic pump 303 is preferably 40L / min, and the oil supply should not be less than 40L / min.

[0127] The hydraulic motor 403 is externally connected to high-pressure oil, and the oil supply is preferably 40L / min, meeting the requirement that the oil supply should not be less than 40L / min.

[0128] The rated torque range of the speed torque sensor is preferably 0.2-5000N·m, and the speed range is preferably 50000r / min.

[0129] The torque range of the dynamometer is preferably 100 N·m, and the speed range is preferably 3000 r / min; when a load is applied to the electric drive unit and the hydraulic drive unit, the loading torque is continuously adjustable.

[0130] During the experiment, the hydraulic drive unit or the electric drive unit can be operated independently. The speed of the drive motor, the speed of the electric drive unit and the load ratio of the two dynamometers can be controlled through the electric control cabinet. At the same time, the experimental data can be viewed and saved in real time.

[0131] Embodiment 1: This embodiment is a specific embodiment of a liquid drive unit.

[0132] The specific steps are as follows:

[0133] a) Coolant drive unit, start the test after the oil temperature Ti of temperature sensor C1 and the oil temperature Ty of temperature sensor C2 are both stable at 21°C;

[0134] b) the data acquisition and control system starts the hydraulic drive motor 301;

[0135] c) adjusting the overflow valve 9 and the pressure sensor B1 to a pressure Py of 10 MPa; setting the load My of the first dynamometer 401 to 20 N·m, 40 N·m, 60 N·m and 80 N·m respectively;

[0136] d) If the oil temperature Ty of temperature sensor C2 changes by less than 0.2°C within two minutes, it is judged that thermal equilibrium has been reached. If this condition is met, the experiment ends.

[0137] Embodiment 2: This embodiment is a specific embodiment of an electric drive unit.

[0138] The specific steps are as follows:

[0139] a) The data acquisition and control system stores all experimental data and obtains the oil temperature Ty change results as follows Figure 4 shown.

[0140] b) Cool the electric drive unit until the oil temperature Tj of the temperature sensor C1 and the oil temperature Td of the temperature sensor C3 are both stable at 21°C before starting the test;

[0141] c) The data acquisition and control system starts the electric drive motor and motor pump;

[0142] d) Set the speed of the electric drive motor nd to 1200 rpm, and set the load of dynamometer B to Md to 20 N·m, 40 N·m, 60 N·m and 80 N·m respectively;

[0143] e) If the oil temperature Td of temperature sensor C3 changes by less than 0.2°C within two minutes, it is judged that thermal equilibrium is reached. If this condition is met, the experiment ends;

[0144] f) The data acquisition and control system stores all experimental data and obtains the change of oil temperature data Td as follows Figure 5 shown.

[0145] Embodiment 3: This embodiment is a specific embodiment of a liquid-electric coupling unit.

[0146] The specific steps are as follows:

[0147] a) Cool the test device until the oil temperature Tj of temperature sensor C1 and the oil temperature Td of temperature sensor C3 are both stable at 21°C, and then start the test;

[0148] b) The data acquisition and control system starts the electric drive motor and the hydraulic drive motor at the same time;

[0149] c) Adjust the overflow valve and the pressure of the pressure sensor B1 to Py = 10 MPa; set the load of dynamometer A to My = 30 N·m; set the speed of the electric drive motor to nd = 1200 r / min, and set the load of dynamometer B to Md = 15 N·m;

[0150] d) If the changes of the oil temperature Ty of the temperature sensor C2 and the oil temperature Td of the temperature sensor C3 are both less than 0.2°C within two minutes, it is judged that thermal equilibrium is reached. If this condition is met, the experiment ends;

[0151] e) The data acquisition and control system stores all experimental data and obtains the changes of oil temperature data Ty and Td as follows Figure 6 shown.

[0152] A wheel hub electro-hydraulic coupling drive device thermal balance test bench and method proposed in the present invention have the following advantages: 1. The space layout of the bench is reasonable and the space utilization rate is high. Three side-by-side circuits are integrated on a base. The circuits are connected by hydraulic pipes, which can realize the cooling, lubrication and driving function tests of the unit and coupling unit of the wheel hub electro-hydraulic coupling drive device; 2. According to the free combination of different oil pipes and oil channels in the bench, the different cooling and lubrication circuit designs of the electric drive unit and the hydraulic drive unit can be verified; 3. Through standardized test methods and test steps, the thermal balance characteristics of the wheel hub electro-hydraulic coupling drive device can be verified, and it has the test test, data collection and storage functions of the temperature, speed and torque of the subunits and coupling units of the electro-hydraulic coupling drive device.

[0153] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0154] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A wheel hub electro-hydraulic coupling drive device thermal balance test bench, characterized in that: It comprises a base (1), one side of the top surface of the base (1) is fixedly connected to an oil tank (2), and the other side of the top surface of the base (1) is provided with a liquid drive supply structure (3), a liquid drive dynamometer structure (4), and an electric drive dynamometer structure (5); The liquid inlet end of the liquid drive liquid supply structure (3) is in communication with the oil tank (2), the liquid outlet end of the liquid drive liquid supply structure (3) is in communication with the liquid inlet end of the liquid drive dynamometer structure (4), a relief valve (9) for constant pressure is in communication in the middle of the communication pipeline between the liquid outlet end of the liquid drive liquid supply structure (3) and the liquid inlet end of the liquid drive dynamometer structure (4), and a first monitoring structure is provided on the pipeline connecting the relief valve (9) and the liquid drive dynamometer structure (4); The liquid outlet of the liquid-driven dynamometer structure (4) is connected to the liquid inlet of the electric-driven dynamometer structure (5) via a first one-way valve (15), and a second monitoring structure is provided on the pipeline connecting the liquid outlet of the liquid-driven dynamometer structure (4) and the first one-way valve (15); The liquid outlet of the electric drive dynamometer structure (5) is in communication with the oil tank (2); a first air cooling structure (21) is fixedly connected to the oil tank (2) for dissipating heat from a pipeline connecting the electric drive dynamometer structure (5) and the oil tank (2); and a third monitoring structure is provided on the pipeline connecting the liquid outlet of the electric drive dynamometer structure (5) and the oil tank (2); The top surface of the oil tank (2) is fixedly connected to an electric drive liquid supply structure (6), the liquid inlet end of the electric drive liquid supply structure (6) is in communication with the oil tank (2), and the liquid outlet end of the electric drive liquid supply structure (6) is in communication with the liquid inlet end of the electric drive dynamometer structure (5) via a second one-way valve (20); The rear side of the oil tank (2) is fixedly connected to a control structure (22); the liquid drive supply structure (3), the liquid drive dynamometer structure (4), the electric drive dynamometer structure (5), the electric drive supply structure (6), the first monitoring structure, the second monitoring structure, and the third monitoring structure are electrically connected to the control structure (22); The first monitoring structure comprises an oil flow sensor A1, a pressure sensor B1, and a temperature sensor C1, which are used to monitor the flow, pressure, and temperature of the inlet oil of the liquid drive dynamometer structure (4); The second monitoring structure includes an oil flow sensor A2, a pressure sensor B2, and a temperature sensor C2; The third monitoring structure includes an oil flow sensor A3, a pressure sensor B3, and a temperature sensor C3; After the temperature measured by the second monitoring structure stabilizes, the oil in the device reaches thermal equilibrium; After the temperature measured by the third monitoring structure stabilizes, the oil in the device reaches thermal equilibrium; The thermal balance test bench for the wheel hub electro-hydraulic coupling drive device can realize the test verification of the thermal balance characteristics of the independent modules of the hydraulic drive unit and the electric drive unit, as well as the verification of the temperature rise characteristics under the coupling of the hydraulic drive unit and the electric drive unit.

2. A wheel hub electro-hydraulic coupling drive device thermal balance test bench according to claim 1, characterized in that: The liquid drive and liquid supply structure (3) comprises a liquid drive motor (301), a first speed torque sensor (302), and a hydraulic pump (303); The hydraulic drive motor (301), the first speed torque sensor (302), and the hydraulic pump (303) are arranged axially from front to back on one side of the base (1); the output shaft of the hydraulic drive motor (301) is connected to one end of the first speed torque sensor (302), and the other end of the first speed torque sensor (302) is connected to the power input end of the hydraulic pump (303); The liquid outlet of the oil tank (2) is connected to the liquid inlet of the hydraulic pump (303) through a first connecting pipe (7), and the liquid outlet of the hydraulic pump (303) is connected to the liquid inlet of the liquid drive dynamometer structure (4) through a second connecting pipe (8), the overflow valve (9) and a third connecting pipe (11) in sequence; The first monitoring structure is connected to the middle part of the third connecting pipe (11), and is used to monitor the flow rate, pressure and temperature of the inlet oil of the liquid drive dynamometer structure (4).

3. A wheel hub electro-hydraulic coupling drive device thermal balance test bench according to claim 2, characterized in that: The hydraulic drive dynamometer structure (4) comprises a hydraulic motor (403), a second speed torque sensor (402), and a first dynamometer (401); The hydraulic motor (403), the second speed torque sensor (402), and the first dynamometer (401) are axially arranged from the back to the front in the middle of the top surface of the base (1); the power output end of the hydraulic motor (403) is connected to one end of the second speed torque sensor (402), and the other end of the second speed torque sensor (402) is connected to the first dynamometer (401); The liquid outlet end of the third connecting pipe (11) is connected to the liquid inlet end of the hydraulic motor (403); The liquid outlet of the hydraulic motor (403) is connected to the liquid inlet of the electric drive dynamometer structure (5) via a fourth connecting pipe (12), and the second monitoring structure and the first one-way valve (15) are connected to the fourth connecting pipe (12) in sequence.

4. A wheel hub electro-hydraulic coupling drive device thermal balance test bench according to claim 3, characterized in that: The electric drive dynamometer structure (5) comprises a second dynamometer (501), a third speed torque sensor (502), and an electric drive motor (503); an output shaft of the electric drive motor (503) is connected to one end of the third speed torque sensor (502), and the other end of the third speed torque sensor (502) is connected to the second dynamometer (501); The liquid outlet end of the hydraulic motor (403) is connected to the liquid inlet end of the electric drive motor (503) through a fourth connecting pipe (12), and the liquid outlet end of the electric drive motor (503) is connected to the liquid inlet end of the oil tank (2) through a sixth connecting pipe (18); The sixth connecting pipe (18) is arranged for heat exchange with the first air cooling structure (21), and the third monitoring structure is arranged in communication with the middle part of the sixth connecting pipe (18); The liquid outlet of the electrically driven liquid supply structure (6) is connected to the liquid inlet of the electrically driven dynamometer structure (5) via a second one-way valve (20).

5. A wheel hub electro-hydraulic coupling drive device thermal balance test bench according to claim 4, characterized in that: The liquid outlet end of the electric drive liquid supply structure (6) is connected to the liquid inlet end of the fifth connecting tube (17) via the seventh connecting tube (19); the liquid outlet ends of the seventh connecting tube (19) and the fourth connecting tube (12) are connected to the liquid inlet end of the fifth connecting tube (17) via the three-way tube (16); and the liquid outlet end of the fifth connecting tube (17) is connected to the liquid inlet end of the electric drive motor (503).

6. A wheel hub electro-hydraulic coupling drive device thermal balance test bench according to claim 3, characterized in that: The oil leakage port of the hydraulic pump (303) is connected to the oil outlet of the overflow valve (9) via a first leakage pipe (10); The oil leakage port of the hydraulic motor (403) is connected to the oil outlet of the overflow valve (9) via a second leakage pipe (13); The oil outlet of the overflow valve (9) is connected to the oil inlet of the oil tank (2) via a leakage liquid return pipe (14), and a second air cooling structure (23) is provided on the leakage liquid return pipe (14).

7. A wheel hub electro-hydraulic coupling drive device thermal balance test method, based on a wheel hub electro-hydraulic coupling drive device thermal balance test bench according to any one of claims 1 to 6, characterized in that: The steps include: The oil in the cooling device is kept at normal temperature; According to different experimental needs, the corresponding structure is started by controlling the control structure (22) to start the experiment; When the oil in the device reaches thermal equilibrium, stop the experiment; Collect and store relevant data.

8. A thermal balance test method for a wheel hub electro-hydraulic coupling drive device according to claim 7, characterized in that: When a liquid drive experiment is carried out, the liquid drive supply structure (3) and the liquid drive dynamometer structure (4) are started by controlling the control structure (22); adjusting the overflow valve (9) so that the oil pressure measured by the first monitoring structure reaches the experimental requirement; Adjust the load in the liquid drive dynamometer structure (4) to meet the experimental requirements; The liquid drive supply structure (3) draws oil from the oil tank (2), and the oil passes through the liquid drive supply structure (3), the liquid drive dynamometer structure (4), and the electric drive dynamometer structure (5) in sequence, and then returns to the oil tank (2) through the first air cooling structure (21); When the temperature measured by the second monitoring structure stabilizes, the oil in the device reaches thermal equilibrium.

9. A thermal balance test method for a wheel hub electro-hydraulic coupling drive device according to claim 7, characterized in that: When the electric drive experiment is carried out, the electric drive dynamometer structure (5) and the electric drive fluid supply structure (6) are started by controlling the control structure (22); Adjusting the rotation speed of the electric drive dynamometer structure (5) to meet the experimental requirements; Adjust the load in the electric drive dynamometer structure (5) to meet the experimental requirements; The electric drive liquid supply structure (6) draws oil from the oil tank (2), and the oil passes through the electric drive liquid supply structure (6) and the electric drive dynamometer structure (5) in sequence, and then returns to the oil tank (2) through the first air cooling structure (21); When the temperature measured by the third monitoring structure stabilizes, the oil in the device reaches thermal equilibrium.

10. A thermal balance test method for a wheel hub electro-hydraulic coupling drive device according to claim 7, characterized in that: When conducting a coupling experiment between a liquid drive unit and an electric drive unit, the liquid drive supply structure (3), the liquid drive dynamometer structure (4), the electric drive dynamometer structure (5), and the electric drive supply structure (6) are started by controlling the control structure (22); adjusting the overflow valve (9) so that the oil pressure measured by the first monitoring structure reaches the experimental requirement; Adjust the load in the liquid drive dynamometer structure (4) to meet the experimental requirements; Adjusting the rotation speed of the electric drive dynamometer structure (5) to meet the experimental requirements; Adjust the load in the electric drive dynamometer structure (5) to meet the experimental requirements; When the temperatures measured by the second monitoring structure and the third monitoring structure are both stable, the oil in the device reaches thermal equilibrium.

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