Multi-condition testing device and testing method for integrated oil-cooled motor rear end cover

Abstract

The present invention provides a multi-condition test device and a test method for an integrated oil-cooled motor rear end cover, belonging to the technical field of new energy motor product testing. The test device includes a test rear end cover, an oil path baffle, a flow meter, a flow valve, a first thermistor, a second thermistor and a control terminal. The test rear end cover is covered on the machine shell. The test rear end cover is provided with a rotor mounting hole, a stator mounting hole and an oil outlet. The stator oil pipe is communicated with the stator mounting hole. A fuel pump and an oil cooler are also connected and arranged on the test rear end cover. The oil path baffle is covered on the test rear end cover. The oil path baffle is provided with a rotor oil inlet. The flow meter and the flow valve are both installed on the oil path baffle. The first thermistor is arranged at the rotor oil inlet, and the second thermistor is arranged at the oil outlet. By adopting the test device and the method, the multi-condition oil cooling test of the oil-cooled motor can be realized without the software and hardware support after vehicle loading, effectively reducing the test cost and improving the test efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy motor product testing, and particularly relates to a multi-condition testing device and testing method for an integrated oil-cooled motor rear end cover. Background Art

[0002] In the field of new energy vehicles, when the drive motor of a new energy vehicle is working, the higher its rotational speed, torque density, and power density, the more heat it generates. Therefore, the heat dissipation and cooling structure of the motor are essential for the reliable, stable, and efficient operation of the motor. The cooling of the motor can be divided into air cooling, water cooling, and oil cooling. Oil cooling is becoming the first choice for high-performance motor cooling solutions due to its natural electrical insulation, high degree of freedom in structural design, and other advantages. Before the products using oil-cooled motors leave the factory, it is necessary to test the cooling effect of the oil-cooled motors to ensure product quality.

[0003] In the related art, the traditional testing scheme is that designers perform theoretical calculations based on the heat generation of the stator and rotor in the oil-cooled motor, and then design and allocate the oil circuit pipes for the stator and rotor of the oil-cooled motor. In the traditional design, the oil flow rate in the stator and rotor oil channels is fixed, and the temperature is measured only for fixed working conditions to confirm its reliability, and an electromagnetic flow valve (abbreviation: solenoid valve) is not set for flow distribution. In high-power motors, due to unreasonable flow distribution design, the motor temperature rise is often too high, and even the motor is burned out. And in some hybrid products, there is a design of controlling the solenoid valve to control the branch flow. Its principle is to use the vehicle's TCU (Telematics Control Unit, temperature control device) to control the opening and closing of the solenoid valve on the corresponding oil circuit pipe by using a triangular wave plus dither control method, in order to make the design structure in the product achieve the theoretical cooling effect.

[0004] Adopting the testing method in the related art requires actual vehicle installation and proper pipeline connection of the product, and then actual operation in cooperation with the TCU to achieve. It has high requirements for the software and hardware of the test. And if there is a situation where the estimated heat loss under multiple working conditions does not match the cooling oil circuit during the test, resulting in the test temperature rise not meeting the expected requirements, it is necessary to redesign and manufacture the oil circuit pipes to meet the flow requirements of the oil-cooled motor under different working conditions. The testing cost is high and the testing efficiency is low. Summary of the Invention

[0005] The embodiments of the present invention provide a multi-condition testing device and testing method for an integrated oil-cooled motor rear end cover, which can realize multiple flow distributions for the stator and rotor oil circuits in the oil-cooled motor without the software and hardware support provided after vehicle installation, realize multi-condition testing, effectively reduce the testing cost, and improve the testing efficiency. The technical solutions are as follows:

[0006] In a first aspect, an embodiment of the present invention provides a multi-condition test device for an integrated oil-cooled motor rear end cover, which is used for being cooperatively connected with an oil-cooled motor. The oil-cooled motor includes a housing, a rotor, and a stator oil pipe. The rotor is disposed in the inner cavity of the housing and is rotatably connected to the housing at one end. The rotor has a rotor oil passage inside, and the rotor has a first oil injection port communicating with the rotor oil passage. The stator oil pipe is disposed on the inner cavity wall of the housing and is parallel to the rotor. The stator oil pipe has a second oil injection port. The multi-condition test device includes:

[0007] a test rear end cover, an oil passage baffle, a flowmeter, a flow valve, a first thermistor, a second thermistor, and a control terminal,

[0008] The test rear end cover is fixedly covered on the housing and covers the inner cavity. The test rear end cover has a rotor mounting hole, a stator mounting hole, and an oil outlet. The other end of the rotor is rotatably mounted in the rotor mounting hole. The stator oil pipe communicates with the stator mounting hole. The test rear end cover is also connected with an oil pump and an oil cooler. The outlet of the oil pump communicates with the inlet of the oil cooler, and the outlet of the oil cooler communicates with the stator mounting hole. The oil outlet communicates with the inner cavity;

[0009] The oil passage baffle is covered on the side of the test rear end cover facing away from the housing. The oil passage baffle covers the stator mounting hole. The oil passage baffle has a rotor oil inlet. The rotor oil inlet communicates with the rotor oil passage through the other end of the rotor. The flowmeter and the flow valve are both mounted on the oil passage baffle. The outlet of the oil cooler communicates with the inlet of the flowmeter, the outlet of the flowmeter communicates with the inlet of the flow valve, and the outlet of the flow valve communicates with the rotor oil inlet;

[0010] The first thermistor is disposed at the rotor oil inlet, and the second thermistor is disposed at the oil outlet. The first thermistor, the second thermistor, the flowmeter, the flow valve, the oil pump, and the oil cooler are electrically connected to the control terminal.

[0011] Optionally, the control terminal is a bipolar power supply, and the bipolar power supply has a control panel.

[0012] Optionally, the test rear end cover has a plurality of the stator mounting holes, and the plurality of stator mounting holes are arranged around the stator mounting hole in the circumferential direction of the rotor.

[0013] Optionally, an annular oil path collecting groove is formed on the surface of the oil path baffle facing the test rear end cover. The oil path collecting groove is arranged around the rotor oil inlet. The outlet of the oil cooler is communicated with the oil path collecting groove, and all the stator mounting holes are communicated with the oil path collecting groove.

[0014] Optionally, the multi-condition test device further includes a tubing seal plug. The aperture of the stator mounting hole is larger than the outer diameter of the stator tubing. The tubing seal plug is sleeved on the end of the stator tubing, and the stator tubing is fixedly connected to the stator mounting hole through the tubing seal plug.

[0015] Optionally, a hose is used to connect between the outlet of the oil cooler and the inlet of the flowmeter, and between the outlet of the flowmeter and the inlet of the flow valve.

[0016] Optionally, the multi-condition test device further includes a filter. The filter is fixedly installed on the test rear end cover. The outlet of the filter is used to communicate with the inlet oil path, and the outlet of the filter is communicated with the inlet of the oil pump.

[0017] In a second aspect, an embodiment of the present invention provides a test method, which is implemented based on the multi-condition test device of the integrated oil-cooled motor rear end cover described in the first aspect. The test method includes:

[0018] The test rear end cover and the oil path baffle are sequentially and cooperatively installed on the housing of the oil-cooled motor, so that the stator tubing is communicated with the stator mounting hole, the outlet of the oil pump is communicated with the inlet of the oil cooler, the outlet of the oil cooler is communicated with the stator mounting hole, the oil outlet is communicated with the inner cavity, the rotor oil inlet is communicated with the rotor oil path through the other end of the rotor, the outlet of the oil cooler is communicated with the inlet of the flowmeter, the outlet of the flowmeter is communicated with the inlet of the flow valve, and the outlet of the flow valve is communicated with the rotor oil inlet;

[0019] Start the oil-cooled motor, use the control terminal to supply power to the first thermistor, the second thermistor, the flowmeter, the flow valve, the oil pump and the oil cooler, and according to the working condition of the oil-cooled motor, use the control terminal to control the power of the oil pump and the opening of the flow valve to adjust the flow rate of the oil entering the stator tubing and the rotor oil path;

[0020] Based on the temperature difference between the temperature values of the first thermistor and the second thermistor, confirm the cooling effect of the oil-cooled motor under the corresponding working condition, and record the value of the flowmeter.

[0021] The beneficial effects brought by the technical solution provided by the embodiment of the present invention at least include:

[0022] Using the multi-condition testing device provided by the present invention, the overall oil flow entering from the inlet oil circuit is controlled by the oil pump, while the oil flow entering the rotor oil circuit is determined by the opening degree of the flow valve. By adjusting the opening degree of the flow valve, the oil flow entering the stator oil pipe and the rotor oil circuit can be distributed and adjusted. The tester can monitor the values of the first thermistor and the second thermistor by using the control terminal to obtain the input temperature of the oil when it enters the rotor oil circuit and the output temperature when it is discharged outside the housing. By converting the heat exchange amount between the oil and the rotor using the temperature difference data between the input temperature and the output temperature, the cooling effect of the oil on the oil-cooled motor under the corresponding working conditions can be evaluated when the oil flow is distributed between the input rotor and the stator oil pipe. For different working conditions of the oil-cooled motor, the tester can adjust the opening degree of the flow valve to perform corresponding oil distribution. The tester can improve the oil circuit pipes in the oil-cooled motor according to the test situation and data to obtain the best cooling effect.

[0023] The multi-condition testing device is cooperatively installed with the oil-cooled motor through a test rear end cover and an oil circuit baffle plate that match the oil-cooled motor, and is controlled and data-collected through an external control terminal. It can realize multiple flow distributions for the stator and rotor oil circuits in the oil-cooled motor without the software and hardware support provided after loading, and realize multi-condition testing. It is convenient for the tester to perform preliminary adjustment and re-design of the oil-cooled motor based on the test results, effectively reducing the test cost and improving the test efficiency. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description 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 efforts.

[0025] Figure 1 It is a three-dimensional structural schematic diagram of one side of the multi-condition testing device integrating the rear end cover of the oil-cooled motor provided by the embodiment of the present invention;

[0026] Figure 2 It is a three-dimensional structural schematic diagram of the other side of the multi-condition testing device integrating the rear end cover of the oil-cooled motor provided by the embodiment of the present invention;

[0027] Figure 3 It is a side view structural schematic diagram of the multi-condition testing device integrating the rear end cover of the oil-cooled motor provided by the embodiment of the present invention;

[0028] Figure 4 As shown in Figure 3 The structural schematic diagram of the disassembly state of the oil circuit baffle plate in;

[0029] Figure 5 It is a schematic structural diagram of the outer side of the oil circuit baffle provided by an embodiment of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the inner side of the oil circuit baffle provided by an embodiment of the present invention;

[0031] Figure 7 It is a sectional view of the assembly structure of the oil circuit baffle and the test rear end cover provided by an embodiment of the present invention;

[0032] Figure 8 It is a schematic structural diagram of the housing of the oil-cooled motor provided by an embodiment of the present invention;

[0033] Figure 9 It is a schematic structural diagram of the stator oil pipe provided by an embodiment of the present invention;

[0034] Figure 10 It is a sectional view of the structure of the rotor provided by an embodiment of the present invention;

[0035] Figure 11 It is a schematic three-dimensional structure diagram of the rotor provided by an embodiment of the present invention;

[0036] Figure 12 It is a schematic structural diagram of the control terminal provided by an embodiment of the present invention;

[0037] Figure 13 It is a block diagram of the control structure of the multi-condition test device for the integrated oil-cooled motor rear end cover provided by an embodiment of the present invention;

[0038] Figure 14 It is a flowchart of a test method provided by an embodiment of the present invention. Specific Embodiments

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] In the related art, the traditional test scheme is that designers perform theoretical calculations based on the heat generation of the stator and rotor in the oil-cooled motor, and then design and allocate the oil pipeline for the stator and rotor of the oil-cooled motor. In the traditional design, the oil flow rate in the stator and rotor oil ducts is fixed, and the temperature is measured only for fixed working conditions to confirm its reliability, without setting an electromagnetic flow valve (abbreviated as solenoid valve) for flow distribution. In high-power motors, due to unreasonable flow distribution design, the motor temperature often rises too high, even burning out the motor. In some hybrid products, there is a design of controlling the solenoid valve to control the branch flow. The principle is that the TCU (Telematics Control Unit, temperature control device) of the vehicle uses a triangular wave plus dither control method to control the opening and closing of the solenoid valve on the corresponding oil pipeline, so that the design structure in the product can achieve the theoretical cooling effect.

[0041] Adopting the test method in the related art requires actual vehicle installation of the product and connection of the pipelines, and then cooperating with the TCU for actual operation to achieve, which has high requirements for the test software and hardware. And if there is a situation where the estimated heat loss under multiple working conditions does not match the cooling oil circuit during the test, resulting in the test temperature rise not meeting the expected requirements, then it is necessary to redesign and manufacture the oil pipeline to meet the flow requirements of the oil-cooled motor under different working conditions, with high test costs and low test efficiency.

[0042] Figure 1 It is a three-dimensional structure schematic diagram of one side of the multi-condition test device for the integrated oil-cooled motor rear end cover provided by an embodiment of the present invention. Figure 2 It is a three-dimensional structure schematic diagram of the other side of the multi-condition test device for the integrated oil-cooled motor rear end cover provided by an embodiment of the present invention. Figure 3 It is a side view structure schematic diagram of the multi-condition test device for the integrated oil-cooled motor rear end cover provided by an embodiment of the present invention. Figure 4 As shown in Figure 3 The structure schematic diagram of the oil circuit baffle in the disassembled state. Figure 5 It is a structure schematic diagram of the outer side of the oil circuit baffle provided by an embodiment of the present invention. Figure 6 It is a structure schematic diagram of the inner side of the oil circuit baffle provided by an embodiment of the present invention. Figure 7 It is an assembly structure sectional view of the oil circuit baffle and the test rear end cover provided by an embodiment of the present invention. Figure 8 It is a structure schematic diagram of the housing of the oil-cooled motor provided by an embodiment of the present invention. Figure 9 It is a structure schematic diagram of the stator oil pipe provided by an embodiment of the present invention. Figure 10 It is a sectional view of the structure of the rotor provided by an embodiment of the present invention. Figure 11 It is a three-dimensional structure schematic diagram of the rotor provided by an embodiment of the present invention. Figure 12 It is a structure schematic diagram of the control terminal provided by an embodiment of the present invention. Figure 13It is the control structure block diagram of the multi-condition test device for the integrated oil-cooled motor rear end cover provided by the embodiments of the present invention. As Figures 1 to 13 shown, through practice, the applicant provides a multi-condition test device for an integrated oil-cooled motor rear end cover, which is used to be connected and used in cooperation with the oil-cooled motor m. The oil-cooled motor m includes a housing m1, a rotor m2 and a stator oil pipe m3. The rotor m2 is arranged in the inner cavity of the housing m1 and is rotatably connected to the housing m1 at one end. The rotor m2 has a rotor oil passage m21 inside, and the rotor m2 has a first oil injection port m22 communicating with the rotor oil passage m21. The stator oil pipe m3 is arranged on the inner cavity wall of the housing m1 and is parallel to the rotor m2. The stator oil pipe m3 has a second oil injection port m31.

[0043] The multi-condition test device includes: a test rear end cover 1, an oil passage baffle 2, a flow meter 3, a flow valve 4, a first thermistor 5, a second thermistor 6 and a control terminal 7.

[0044] Among them, the test rear end cover 1 is fixedly covered on the housing m1 and covers the inner cavity. The test rear end cover 1 has a rotor mounting hole 11, a stator mounting hole 12 and an oil outlet 13. The other end of the rotor m2 is rotatably installed in the rotor mounting hole 11, and the stator oil pipe m3 communicates with the stator mounting hole 12. The test rear end cover 1 is also connected with an oil pump 14 and an oil cooler 15. The outlet of the oil pump 14 is communicated with the inlet of the oil cooler 15, and the outlet of the oil cooler 15 is communicated with the stator mounting hole 12. The oil outlet 13 is communicated with the inner cavity.

[0045] The oil passage baffle 2 is covered on the side of the test rear end cover 1 facing away from the housing m1. The oil passage baffle 2 covers the stator mounting hole 12. The oil passage baffle 2 has a rotor oil inlet 21, and the rotor oil inlet 21 communicates with the rotor oil passage m21 through the other end of the rotor m2. The flow meter 3 and the flow valve 4 are installed on the oil passage baffle 2. The outlet of the oil cooler 15 is communicated with the inlet of the flow meter 3, the outlet of the flow meter 3 is communicated with the inlet of the flow valve 4, and the outlet of the flow valve 4 is communicated with the rotor oil inlet 21.

[0046] The first thermistor 5 is arranged at the rotor oil inlet 21, and the second thermistor 6 is arranged at the oil outlet 13. The first thermistor 5, the second thermistor 6, the flow meter 3, the flow valve 4, the oil pump 14 and the oil cooler 15 are electrically connected to the control terminal 7. Exemplarily, the control terminal 7 can supply power to the first thermistor 5, the second thermistor 6, the flow meter 3, the flow valve 4, the oil pump 14 and the oil cooler 15, and at the same time control the opening degree of the flow valve 4, the output power of the oil pump 14 and the start and stop of the oil cooler 15.

[0047] In the embodiment of the present invention, when multi-condition oil cooling test of the integrated oil-cooled motor is required, before the oil-cooled motor is installed on the vehicle, the rear end cover of the oil-cooled motor m itself can be removed, and instead, the test rear end cover 1 and the oil passage baffle 2 of the test device are sequentially and cooperatively installed on the housing m1 of the oil-cooled motor m. By using the test rear end cover 1 and the oil passage baffle 2 to replace the original rear end cover, the connection between the oil inlet oil passage and the oil-cooled motor m is realized. After the oil cooling test starts, the rotor m2 in the oil-cooled motor m rotates in the inner cavity of the housing m1. The oil in the oil inlet oil passage can enter the oil cooler 4 under the pressure of the oil pump 14. The low-temperature oil after heat exchange and cooling is divided into two paths. One path of the oil enters the stator oil pipe m3 through the stator mounting hole 12 between the oil passage baffle 2 and the test rear end cover 1, and is sprayed into the inner cavity of the housing m1 through the first injection port m22 for cooling; while the other path of the oil enters the pipeline connected to the flow meter 3, and comes to the front of the flow valve 4 after passing through the flow meter 3. The tester controls the opening of the flow valve 4 according to the current working condition of the oil-cooled motor m, so that the flow rate of the oil entering the rotor oil passage m21 reaches the preset value. This part of the oil cools the inside of the rotor m2 through the rotor oil passage m1 in the rotor m2, and finally is sprayed onto the inner cavity of the housing m1 and the rotor m2 through the second injection port m31 to further realize cooling. Finally, the oil in the inner cavity leaves the housing m1 through the oil outlet 13 for recovery or oil cooling circulation.

[0048] Using the multi-condition testing device provided by the present invention, the overall oil flow entering from the inlet oil circuit is controlled by the oil pump 14, while the oil flow entering the rotor oil circuit m21 is determined by the opening degree of the flow valve 4. By adjusting the opening degree of the flow valve 4, the oil flow entering the stator oil pipe m3 and the rotor oil circuit m21 can be distributed and adjusted. The tester can use the control terminal 7 to monitor the values of the first thermistor 5 and the second thermistor 6 to obtain the input temperature of the oil when it enters the rotor oil circuit m21 and the output temperature when it exits the machine housing m1. By converting the heat exchange amount between the oil and the rotor m2 using the temperature difference data between the input temperature and the output temperature, the cooling effect of the oil on the oil-cooled motor under the corresponding working conditions can be evaluated. For different working conditions of the oil-cooled motor m, the tester can adjust the opening degree of the flow valve 4 for corresponding oil distribution. The tester can improve the oil circuit pipes inside the oil-cooled motor m according to the test conditions and data to obtain the best cooling effect. The multi-condition testing device is cooperatively installed with the oil-cooled motor m through the test rear end cover 1 and the oil circuit baffle 2 that match the oil-cooled motor m, and is controlled and data-collected through the external control terminal 7. It can achieve multiple flow distributions for the stator and rotor oil circuits inside the oil-cooled motor without the software and hardware support provided after loading, and realize multi-condition testing. It is convenient for the tester to perform preliminary adjustment and redesign on the oil-cooled motor m based on the test results, effectively reducing the test cost and improving the test efficiency.

[0049] Optionally, the control terminal 7 is a bipolar power supply, and the bipolar power supply is provided with a control panel 71. Exemplarily, in the embodiment of the present invention, during the test, the tester can adjust the opening degree of the flow valve 4 through the control panel 71 on the bipolar power supply, and at the same time obtain test data such as the power of the oil pump 14, the values of the flowmeter 3, the first thermistor 5, and the second thermistor 6 using the display screen on the control panel 71. The bipolar power supply adopts a control method of DC wave plus sine wave, replacing the traditional TCU's control method of triangular wave plus dither, reducing the requirements for the TCU software and hardware during the test. At the same time, the bipolar power supply can also provide a 0.2A DC current and superimpose a 0.05A, 50Hz current fluctuation to achieve the fast response of the flow valve 4 valve body, further improving the adjustment control accuracy and test accuracy of the multi-condition testing device.

[0050] Optionally, there are multiple stator mounting holes 12 on the test rear end cover 1, and the multiple stator mounting holes 12 are arranged circumferentially around the stator mounting hole 12 of the rotor m2. Exemplarily, for oil-cooled motors m of different model specifications, multiple stator oil pipes m3 may be provided in the inner cavity of the motor housing m1 at the same time to achieve better oil spraying coverage and improve the cooling effect. In the embodiment of the present invention, by providing a plurality of stator mounting holes 12 on the test rear end cover 1, the cooperative connection with multiple stator oil pipes m3 can be achieved simultaneously to adapt to oil-cooled motors m of different model specifications, improving the adaptability of the multi-condition test device.

[0051] Optionally, the oil path baffle 2 has an annular oil path collecting groove 22 on the plate surface facing the test rear end cover 1. The oil path collecting groove 22 is arranged around the rotor oil inlet 21. The outlet of the oil cooler 15 is communicated with the oil path collecting groove 22, and the multiple stator mounting holes 12 are all communicated with the oil path collecting groove 22. Refer to Figure 7 , Exemplarily, in the embodiment of the present invention, the oil fluid output by the oil cooler 15 will flow out to the side surface of the test rear end cover 1 facing away from the motor housing m1 through the flow path provided inside the test rear end cover and flow in the oil path collecting groove 22. After the oil path collecting groove 22 is filled with oil fluid, it can enter the corresponding stator oil pipe m3 through the multiple stator mounting holes 12 communicated with the stator oil pipe m3. There is no need to separately provide pipes for connection between the outlet of the oil cooler 15 and the stator mounting holes 12, reducing the cost of pipe setting and the occupied space, reducing the overall production cost and occupied volume of the multi-condition test device, and improving the practicability.

[0052] Optionally, the multi-condition test device further includes a tubing seal plug 8. The aperture of the stator mounting hole 12 is larger than the outer diameter of the stator oil pipe m3. The tubing seal plug 8 is sleeved on the end of the stator oil pipe m3, and the stator oil pipe m3 is fixedly connected to the stator mounting hole 12 through the tubing seal plug 8. Exemplarily, in the embodiment of the present invention, the stator oil pipe m3 is relatively long and adopts a stretching process, with poor straightness. At the same time, affected by the assembly gap between the inner walls of the motor housing m1, there will be a certain deviation between the stator oil pipe m3 and the stator mounting hole 12 of the test rear end cover 1 or the connection hole of the rear end cover of the oil-cooled motor m itself. In the present invention, the aperture of the stator mounting hole 12 is set relatively large, and a tubing seal plug 8 made of rubber material is sleeved on the end of the stator oil pipe m3. During assembly, the tubing seal plug 8 can be nested between the stator mounting hole 12 and the stator mounting hole 12 to compensate for the assembly errors of these two parts, and at the same time ensure tight assembly, which not only plays a sealing role but also improves the problem of difficult tubing assembly caused by assembly errors. The design of this connection structure can also provide a reference for the assembly structure between the stator oil pipe m3 and the connection hole of the rear end cover of the oil-cooled motor m itself, further improving the practicability of the multi-condition test device.

[0053] Optionally, both between the outlet of the oil cooler 15 and the inlet of the flowmeter 3 and between the outlet of the flowmeter 3 and the inlet of the flow control valve 4 are connected by hoses. Exemplarily, in the embodiments of the present invention, both between the outlet of the oil cooler 15 and the inlet of the flowmeter 3 and between the outlet of the flowmeter 3 and the inlet of the flow control valve 4 are connected by external hoses, which facilitates disassembly and replacement.

[0054] Optionally, the multi-condition test device further includes a filter 9, which is fixedly installed on the test rear end cover 1. The outlet of the filter 9 is used to communicate with the oil inlet circuit, and the outlet of the filter 9 is communicated with the inlet of the oil pump 14. Exemplarily, in the embodiments of the present invention, by arranging the filter 9 in front of the oil pump 14, impurities in the oil flowing into the multi-condition test device, the housing m1, and the rotor m2 can be filtered, avoiding clogging of the oil circuits in the multi-condition test device and the oil-cooled motor m, and further improving the practicability of the multi-condition test device.

[0055] Figure 14 is a flowchart of a test method provided by an embodiment of the present invention. As Figure 14 shown, an embodiment of the present invention also provides a test method, which is implemented based on Figures 1 to 13 the multi-condition test device of the integrated oil-cooled motor rear end cover described above. The test method includes the following steps:

[0056] S1. Install the test rear end cover 1 and the oil circuit baffle 2 on the housing m1 of the oil-cooled motor m in sequence, so that the stator oil pipe m3 is communicated with the stator mounting hole 12, the outlet of the oil pump 14 is communicated with the inlet of the oil cooler 15, the outlet of the oil cooler 15 is communicated with the stator mounting hole 12, the oil outlet 13 is communicated with the inner cavity, the rotor oil inlet 21 is communicated with the rotor oil circuit m21 through the other end of the rotor m2, the outlet of the oil cooler 15 is communicated with the inlet of the flowmeter 3, the outlet of the flowmeter 3 is communicated with the inlet of the flow control valve 4, and the outlet of the flow control valve 4 is communicated with the rotor oil inlet 21.

[0057] Specifically, when multi-condition oil cooling test of the integrated oil-cooled motor is required, before the oil-cooled motor is installed on the vehicle, the original rear end cover of the oil-cooled motor m can be removed, and instead, the test rear end cover 1 and the oil circuit baffle 2 of this test device are installed on the housing m1 of the oil-cooled motor m in sequence, using the test rear end cover 1 and the oil circuit baffle 2 to replace the original rear end cover to realize the connection of the oil inlet circuit and the oil-cooled motor m.

[0058] S2. Start the oil-cooled motor m, use the control terminal 7 to supply power to the first thermistor 5, the second thermistor 6, the flowmeter 3, the flow control valve 4, the oil pump 14, and the oil cooler 15, and according to the working conditions of the oil-cooled motor m, use the control terminal 7 to control the power of the oil pump 14 and the opening of the flow control valve 4 to adjust the flow rate of the oil flowing into the stator oil pipe m3 and the rotor oil circuit m21.

[0059] Specifically, after the oil cooling test starts, the rotor m2 in the oil-cooled motor m rotates in the inner cavity of the motor housing m1. The oil in the inlet oil circuit can enter the oil cooler 4 under the pressure of the oil pump 14. The low-temperature oil after heat exchange and cooling is divided into two paths. One path of the oil enters the stator oil pipe m3 through the stator mounting hole 12 between the oil path baffle 2 and the test end cover 1, and is sprayed into the inner cavity of the motor housing m1 through the first oil spray port m22 for cooling; while the other path of the oil enters the pipeline connected to the flow meter 3, and comes to the front of the flow valve 4 after passing through the flow meter 3. The tester controls the opening of the flow valve 4 according to the current working condition of the oil-cooled motor m, so that the flow rate of the oil entering the rotor oil path m21 reaches the preset value. This part of the oil cools the rotor m2 internally through the rotor oil path m1 in the rotor m2, and is finally sprayed onto the inner cavity of the motor housing m1 and the rotor m2 through the second oil spray port m31 to further achieve cooling. Finally, the oil in the inner cavity leaves the motor housing m1 through the oil outlet 13 for recovery or oil cooling circulation.

[0060] S3. Based on the temperature difference between the temperature values of the first thermistor 5 and the second thermistor 6, confirm the cooling effect of the oil-cooled motor m under the corresponding working condition, and record the value of the flow meter 3.

[0061] Specifically, the overall oil flow rate entering from the inlet oil circuit is controlled by the oil pump 14, while the oil flow rate entering the rotor oil path m21 is determined by the opening of the flow valve 4. By adjusting the opening of the flow valve 4, the flow rates of the oil entering the stator oil pipe m3 and the rotor oil path m21 can be allocated and adjusted. The tester can use the control terminal 7 to monitor the values of the first thermistor 5 and the second thermistor 6 to obtain the input temperature of the oil when it enters the rotor oil path m21 and the output temperature when it exits the motor housing m1. By using the temperature difference data between the input temperature and the output temperature to calculate the heat exchange amount between the oil and the rotor m2, the cooling effect of the oil on the oil-cooled motor under the corresponding working condition can be evaluated under the current oil flow rate distribution of the input rotor m2 and the stator oil pipe m3.

[0062] With this multi-condition test device and test method, it is installed in cooperation with the oil-cooled motor m through the test end cover 1 and the oil path baffle 2 that match the oil-cooled motor m, and is controlled and data-collected through the external control terminal 7. It can realize multiple flow rate distributions for the inner stator and rotor oil paths of the oil-cooled motor without the software and hardware support provided after loading, and achieve multi-condition testing. It is convenient for the tester to make preliminary adjustments and re-designs for the oil-cooled motor m based on the test results, effectively reducing the test cost and improving the test efficiency.

[0063] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this invention pertains. The terms "first", "second" and similar terms used in the description and claims of this patent application for invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. The terms "comprising" or "including" and similar terms mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0064] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated multi-condition testing device for the rear end cover of an oil-cooled motor, which is used for cooperative connection with an oil-cooled motor (m). The oil-cooled motor (m) includes a housing (m1), a rotor (m2) and a stator oil pipe (m3). The rotor (m2) is arranged in the inner cavity of the housing (m1) and is rotatably connected to one end of the housing (m1). The rotor (m2) has a rotor oil passage (m21) inside, and a first oil injection port (m22) communicating with the rotor oil passage (m21) is provided on the rotor (m2). The stator oil pipe (m3) is arranged on the inner cavity wall of the housing (m1) and is parallel to the rotor (m2). A second oil injection port (m31) is provided on the stator oil pipe (m3). The multi-condition testing device includes: Test the rear end cover (1), oil circuit baffle (2), flow meter (3), flow valve (4), first thermistor (5), second thermistor (6) and control terminal (7). The test rear end cover (1) is fixedly covered on the housing (m1) and covers the inner cavity. The test rear end cover (1) has a rotor mounting hole (11), a stator mounting hole (12) and an oil outlet (13). The other end of the rotor (m2) is rotatably mounted in the rotor mounting hole (11). The stator oil pipe (m3) is communicated with the stator mounting hole (12). The test rear end cover (1) is also connected with an oil pump (14) and an oil cooler (15). The outlet of the oil pump (14) is communicated with the inlet of the oil cooler (15). The outlet of the oil cooler (15) is communicated with the stator mounting hole (12). The oil outlet (13) is communicated with the inner cavity. The oil circuit baffle (2) is covered on the side surface of the test rear end cover (1) facing away from the housing (m1). The oil circuit baffle (2) covers the stator mounting hole (12). The oil circuit baffle (2) has a rotor oil inlet (21). The rotor oil inlet (21) is communicated with the rotor oil circuit (m21) through the other end of the rotor (m2). The flow meter (3) and the flow valve (4) are both mounted on the oil circuit baffle (2). The outlet of the oil cooler (15) is communicated with the inlet of the flow meter (3). The outlet of the flow meter (3) is communicated with the inlet of the flow valve (4). The outlet of the flow valve (4) is communicated with the rotor oil inlet (21). The first thermistor (5) is arranged at the rotor oil inlet (21). The second thermistor (6) is arranged at the oil outlet (13). The first thermistor (5), the second thermistor (6), the flow meter (3), the flow valve (4), the oil pump (14) and the oil cooler (15) are electrically connected to the control terminal (7).

2. The multi-condition test device for the integrated oil-cooled motor rear end cover according to claim 1, wherein The control terminal (7) is a bipolar power supply, and the bipolar power supply has a control panel (71).

3. The multi-condition testing device for the integrated oil-cooled motor rear end cover according to claim 1, wherein, The test rear end cover (1) has a plurality of the stator mounting holes (12). The plurality of stator mounting holes (12) are arranged around the stator mounting hole (12) in the circumferential direction of the rotor (m2).

4. The multi-condition test device for the integrated oil-cooled motor rear end cover according to claim 3, wherein, The plate surface of the oil circuit baffle (2) facing the test rear end cover (1) has an annular oil circuit collecting groove (22). The oil circuit collecting groove (22) is arranged around the rotor oil inlet (21). The outlet of the oil cooler (15) is communicated with the oil circuit collecting groove (22). The plurality of stator mounting holes (12) are all communicated with the oil circuit collecting groove (22).

5. The multi-condition test device for the integrated oil-cooled motor rear end cover according to claim 4, wherein, The multi-condition test device further includes an oil pipe sealing plug (8). The diameter of the stator mounting hole (12) is larger than the outer diameter of the stator oil pipe (m3). The oil pipe sealing plug (8) is sleeved on the end of the stator oil pipe (m3). The stator oil pipe (m3) is fixedly connected with the stator mounting hole (12) through the oil pipe sealing plug (8).

6. The multi-condition test device for the integrated oil-cooled motor rear end cover according to claim 1, wherein, Between the outlet of the oil cooler (15) and the inlet of the flowmeter (3), and between the outlet of the flowmeter (3) and the inlet of the flow control valve (4), hoses are used for connection.

7. The multi-condition testing device for the rear end cover of the integrated oil-cooled motor according to claim 1, characterized in that, The multi-condition testing device further includes a filter (9). The filter (9) is fixedly installed on the testing rear end cover (1). The outlet of the filter (9) is used to communicate with the oil inlet pipeline, and the outlet of the filter (9) communicates with the inlet of the oil pump (14).

8. A testing method, characterized in that, The testing method is implemented based on the multi-condition testing device of the integrated oil-cooled motor rear end cover according to any one of claims 1 to 7. The testing method includes: Sequentially and cooperatively install the testing rear end cover (1) and the oil pipeline baffle (2) onto the housing (m1) of the oil-cooled motor (m), so that the stator oil pipe (m3) communicates with the stator mounting hole (12), the outlet of the oil pump (14) communicates with the inlet of the oil cooler (15), the outlet of the oil cooler (15) communicates with the stator mounting hole (12), the oil outlet (13) communicates with the inner cavity, the rotor oil inlet (21) communicates with the rotor oil pipeline (m21) through the other end of the rotor (m2), the outlet of the oil cooler (15) communicates with the inlet of the flowmeter (3), the outlet of the flowmeter (3) communicates with the inlet of the flow control valve (4), and the outlet of the flow control valve (4) communicates with the rotor oil inlet (21); Start the oil-cooled motor (m), and use the control terminal (7) to supply power to the first thermistor (5), the second thermistor (6), the flowmeter (3), the flow control valve (4), the oil pump (14) and the oil cooler (15). According to the operating conditions of the oil-cooled motor (m), use the control terminal (7) to control the power of the oil pump (14) and the opening degree of the flow control valve (4) to adjust the flow rate of the oil flowing into the stator oil pipe (m3) and the rotor oil pipeline (m21); Confirm the cooling effect of the oil-cooled motor (m) under the corresponding operating conditions based on the temperature difference between the temperature values of the first thermistor (5) and the second thermistor (6), and record the value of the flowmeter (3).

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