Hub motor bench testing device and method

Abstract

The invention provides a hub motor bench test device and method. The hub motor bench test device comprises a chassis assembly, a bearing seat assembly, a test spline housing, a connecting shaft, a floating assembly and a dynamometer. The chassis assembly is used for installing the hub motor, the connecting shaft is rotatably installed on the bearing seat assembly, one end of the connecting shaft is connected with the test spline housing, the test spline housing is connected with the output end of the hub motor, the other end of the connecting shaft is connected with the floating assembly, and the floating assembly is connected with the bearing seat assembly. The floating assembly is connected with the dynamometer. The problem that an existing hub motor is prone to being damaged in the rack testing process can be solved.

Description

Technical Field

[0001] This invention relates to the field of hub motor bench testing technology, and in particular to a hub motor bench testing device and method. Background Technology

[0002] As a core component of the electric vehicle drive system, the performance testing of the in-wheel motor is crucial for the overall vehicle's power, reliability, and durability. To address this, a single-motor dynamometer bench has been developed in the existing technology. The basic principle of this single-motor dynamometer bench is to fix the in-wheel motor with a rigid mounting bracket, and the motor's output shaft is directly connected to the dynamometer (such as an eddy current, magnetic powder, or electro-hydraulic feedback dynamometer) via a high-speed, high-torque coupling. This approach typically includes a cooling simulation system to replicate the air-cooled or liquid-cooled heat dissipation conditions of the motor during actual operation. However, this approach has a relatively simple installation method, primarily simulating a static, suspended motor, and is insufficient to reflect the motion state and stress environment of the in-wheel motor within the actual vehicle suspension system. The coverage and simulation accuracy of the test conditions are also limited.

[0003] To address the limited coverage and simulation accuracy of single-motor dynamometer test benches, existing technologies have designed test benches integrating half-shafts or wheel-side reducers. These test benches aim to more closely resemble actual vehicle conditions, transmitting the output torque of the hub motor to the dynamometer by retaining or simulating the original vehicle's half-shafts, wheel-side reducers, and other transmission components. This requires the design of dedicated half-shaft fixing and alignment fixtures to ensure precise alignment between the half-shaft spline and the motor output end, and to allow for angle adjustment to simulate the universal joint's working state under different conditions. The dynamometer not only provides load torque but also needs to simulate the inertia of rotating components.

[0004] Specifically, in test benches that integrate half-shafts or wheel-side reducers, power is typically transmitted through a floating connection structure consisting of universal joints and spline sleeves, which adapts to dynamic offsets during testing. While this can compensate to some extent for testing problems caused by the coaxiality deviation between the output shaft of the hub motor and the output shaft of the dynamometer, hub motors are prone to serious mechanical failures such as "rotor rubbing" (i.e., friction between the rotor and the inner wall of the stator) due to the complex and variable operating conditions. This can lead to prototype damage, resulting in not only economic losses but also serious impacts on the research and development progress. Summary of the Invention

[0005] The purpose of this invention is to provide a wheel hub motor bench testing device and method to solve the problem that existing wheel hub motors are prone to damage during bench testing.

[0006] To address the aforementioned technical problems, this invention provides a hub motor bench testing device, comprising a base frame assembly, a bearing housing assembly, a test spline sleeve, a connecting shaft, a floating assembly, and a dynamometer; the base frame assembly is used to mount the hub motor, the connecting shaft is rotatably mounted on the bearing housing assembly, one end of the connecting shaft is connected to the test spline sleeve, the test spline sleeve is connected to the output end of the hub motor, the other end of the connecting shaft is connected to the floating assembly, and the floating assembly is connected to the dynamometer.

[0007] Optionally, the bearing housing assembly includes a base, an adjusting key, a mounting base, and fasteners. The mounting base is located on the base, and the base is provided with a mounting groove for mounting the adjusting key. The mounting base has a sliding hole, and the adjusting key is located in the mounting groove and slides with the sliding hole along the axial direction of the connecting shaft. The mounting base has a shaft hole, and the connecting shaft is rotatably mounted in the shaft hole. The mounting base has a fixing groove, and the fastener passes through the fixing groove and is detachably and fixedly connected to the base.

[0008] Optionally, the bearing housing assembly is mounted on the base frame assembly.

[0009] Optionally, it also includes a fine-tuning component mounted on the base assembly for adjusting the position of the bearing housing assembly in a horizontal direction perpendicular to the axis of the connecting shaft.

[0010] Optionally, the fine-tuning component includes a fixing block and a fine-tuning screw. The fixing block is mounted on the base frame assembly, and the fine-tuning screw is threadedly connected to the fixing block. The fine-tuning screw can abut against the bearing seat assembly.

[0011] Optionally, the base frame assembly includes a bracket and a connecting flange, the connecting flange being detachably mounted on the bracket and used for mounting the hub motor.

[0012] Optionally, the bracket has a structural hole, and the connecting flange has a structural protrusion that mates with the structural hole.

[0013] Optionally, the base frame assembly further includes a large plate and a support column, the large plate being mounted on the support column and the bracket being mounted on the large plate.

[0014] Optionally, the floating assembly includes an output spline sleeve, a first universal joint, a drive shaft, a second universal joint, and an input spline shaft. One end of the drive shaft is connected to the output spline sleeve via the first universal joint, and the output spline sleeve is connected to the connecting shaft. The other end of the drive shaft is connected to the input spline shaft via the second universal joint, and the input spline shaft is connected to the dynamometer.

[0015] The present invention also provides a method for testing a hub motor using the above-mentioned hub motor bench test device, comprising: mounting the hub motor on a base frame assembly; mounting a test spline sleeve on the output end of the hub motor; mounting a connecting shaft on a bearing housing assembly, and connecting one end of the connecting shaft to the test spline sleeve; connecting the other end of the connecting shaft to a floating assembly; and connecting the floating assembly to a dynamometer.

[0016] The hub motor bench testing device and method provided by this invention have the following beneficial effects: By adding a connecting shaft and bearing housing assembly between the test spline sleeve and the floating assembly, with the bearing housing assembly providing precise rotational support for the connecting shaft, the installation accuracy of the test spline sleeve, which is directly connected to the output end of the hub motor, is ensured. This guarantees the coaxiality of the test spline sleeve and the hub motor output end, fundamentally avoiding hub motor rubbing problems caused by misalignment and protecting the expensive test prototype. Secondly, the floating assembly located at the end of the power transmission can be easily connected to the dynamometer and can effectively compensate for coaxiality deviations between the dynamometer and the connecting shaft. This significantly reduces the accuracy requirements for dynamometer installation and alignment, simplifies the installation and debugging process, and improves testing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the isometric structure of the hub motor test bench in an embodiment of the present invention; Figure 2 This is a schematic diagram of the main structure of the hub motor test bench in an embodiment of the present invention; Figure 3 This is a top view of the hub motor test bench in an embodiment of the present invention. Figure 4 This is a cross-sectional view of the hub motor test bench device with a hub motor installed in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 100 - Base frame assembly; 110 - Bracket; 111 - Structural hole; 120 - Connecting flange; 121 - Structural protrusion; 130 - Large plate; 140 - Support column; 200 - Bearing housing assembly; 210 - Base; 220 - Adjusting key; 230 - Mounting seat; 231 - Shaft hole; 300 - Test spline sleeve; 400-Connecting shaft; 500 - Floating assembly; 510 - Output spline sleeve; 520 - First universal joint; 530 - Drive shaft; 540 - Second universal joint; 550 - Input spline shaft; 600 - Fine-tuning component; 610 - Fixing block; 620 - Fine-tuning screw; 700-Hub Motor. Detailed Implementation

[0019] As described in the background section, due to the complex and variable operating conditions, hub motors are highly susceptible to severe mechanical failures such as "rotor rubbing" (i.e., friction between the rotor and the inner wall of the stator), leading to prototype damage. The applicant's research revealed that while the floating connection structure can compensate to some extent for the coaxiality deviation between the hub motor's output shaft and the dynamometer's output shaft when transmitting power, the actual offset may exceed the compensation range of the floating structure due to the complex and variable operating conditions, easily causing "rotor rubbing" in the hub motor. The applicant found that if a support structure could be added to the floating connection structure, reducing the input offset of the spline sleeve within the floating connection structure to within the allowable accuracy range, the offset of the power input to the hub motor could be limited directly by improving the machining and assembly accuracy of the spline sleeve. This would facilitate connection with the dynamometer while also limiting the spline sleeve's offset, thereby avoiding the risk of hub motor "rotor rubbing."

[0020] Based on this, this application proposes a hub motor bench testing device and method, including a base frame assembly, a bearing housing assembly, a test spline sleeve, a connecting shaft, a floating assembly, and a dynamometer. The base frame assembly is used to mount the hub motor. The connecting shaft is rotatably mounted on the bearing housing assembly. One end of the connecting shaft is connected to the test spline sleeve, which is connected to the output end of the hub motor. The other end of the connecting shaft is connected to the floating assembly, which is connected to the dynamometer. By adding a connecting shaft and a bearing housing assembly between the test spline sleeve and the floating assembly, and with the bearing housing assembly providing precise rotational support for the connecting shaft, the installation accuracy of the test spline sleeve, which is directly connected to the output end of the hub motor, is ensured. This ensures the coaxiality of the test spline sleeve and the output end of the hub motor, fundamentally avoiding the hub motor rubbing problem caused by misalignment and protecting the expensive test prototype. Secondly, the floating component located at the end of the power transmission can be easily connected to the dynamometer and can effectively compensate for the coaxiality deviation between the dynamometer and the connecting shaft, thereby significantly reducing the accuracy requirements for the installation and alignment of the dynamometer, simplifying the installation and debugging process, and improving testing efficiency.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 This is a schematic diagram of the isometric structure of the hub motor test bench device in an embodiment of the present invention. Figure 2 This is a front view schematic diagram of the hub motor bench testing device in an embodiment of the present invention. Figure 3 This is a top view of the hub motor test bench device in an embodiment of the present invention. Figure 4This is a cross-sectional view of the hub motor test bench device with a hub motor 700 installed in an embodiment of the present invention. This embodiment provides a hub motor test bench device, including a base frame assembly 100, a bearing housing assembly 200, a test spline sleeve 300, a connecting shaft 400, a floating assembly 500, and a dynamometer. The base frame assembly 100 is used to install the hub motor 700. The connecting shaft 400 is rotatably mounted on the bearing housing assembly 200. One end of the connecting shaft 400 is connected to the test spline sleeve 300, which is connected to the output end of the hub motor 700. The other end of the connecting shaft 400 is connected to the floating assembly 500, which is connected to the dynamometer.

[0028] By adding a connecting shaft 400 and a bearing housing assembly 200 between the test spline sleeve 300 and the floating assembly 500, with the bearing housing assembly 200 providing precise rotational support for the connecting shaft 400, the installation accuracy of the test spline sleeve 300, which is directly connected to the output end of the hub motor 700, is ensured. This guarantees the coaxiality between the test spline sleeve 300 and the output end of the hub motor 700, fundamentally avoiding the hub motor 700 rubbing problem caused by misalignment and protecting the expensive test prototype. Secondly, the floating assembly 500, located at the end of the power transmission, can be easily connected to the dynamometer and can effectively compensate for the coaxiality deviation between the dynamometer and the connecting shaft 400. This significantly reduces the accuracy requirements for the dynamometer's installation and alignment, simplifies the installation and debugging process, and improves testing efficiency.

[0029] Specifically, the bearing housing assembly 200 includes a base 210, an adjusting key 220, a mounting base 230, and fasteners. The mounting base 230 is located on the base 210, and the base 210 has a mounting groove for mounting the adjusting key 220. The mounting base 230 has a sliding hole, and the adjusting key 220 is located in the mounting groove and slides along the axial direction of the connecting shaft 400 with the sliding hole. The mounting base 230 has a shaft hole 231, and the connecting shaft 400 is rotatably mounted in the shaft hole 231. The mounting base 230 has a fixing groove, and the fastener passes through the fixing groove and is detachably and fixedly connected to the base 210. By setting up the bearing housing assembly 200 composed of the base 210, adjusting key 220, mounting base 230, and fasteners, precise adjustment and reliable fixation of the bearing housing position are achieved. Adjusting the sliding fit between the flat key 220 and the sliding hole provides precise guidance for the axial movement of the mounting base 230, ensuring the accuracy of the adjustment direction; the design of the fixing groove and fasteners allows the mounting base 230 to be firmly locked onto the base 210 after adjustment, preventing displacement during testing and ensuring the stability and repeatability of the test.

[0030] Preferably, there are two shaft holes 231, and the two shaft holes 231 are coaxially arranged. Using two coaxial shaft holes 231 to mount the connecting shaft 400 provides a more stable and reliable rotational support compared to single-point support. The double-support structure effectively disperses the radial force borne by the connecting shaft 400, reduces the deflection deformation of the connecting shaft 400 under high-speed rotation, further ensures coaxiality with the hub motor 700, and increases the upper limit of torque and speed that the entire device can withstand, making it suitable for testing higher-power hub motors 700.

[0031] Preferably, the connecting shaft 400 is rotatably mounted in the shaft hole 231 via a bearing. By using a bearing to rotatably mount the connecting shaft 400 in the shaft hole 231, the frictional resistance during the rotation of the connecting shaft 400 is significantly reduced, mechanical losses during transmission are reduced, and the accuracy of test results is improved. At the same time, the bearing can smoothly transmit loads, reduce vibration and noise, and improve the operational stability and service life of the device.

[0032] Preferably, the bearing housing assembly 200 is mounted on the base frame assembly 100. By directly mounting the bearing housing assembly 200 onto the base frame assembly 100, the hub motor 700, test spline sleeve 300, connecting shaft 400, and bearing housing assembly 200 in the power transmission system are all integrated on the same basic platform, forming a compact and highly integrated test unit. This integrated design simplifies the on-site installation process, ensures the relative positional accuracy between components, and improves the overall rigidity and reliability of the system.

[0033] Preferably, the system also includes a fine-tuning component 600, which is mounted on the base frame assembly 100 and used to adjust the position of the bearing housing assembly 200 in a horizontal direction perpendicular to the axial direction of the connecting shaft 400. By adding the fine-tuning component 600, precise fine-tuning of the bearing housing assembly 200 in the horizontal direction is achieved. This function solves the problem of minor lateral positional deviations caused by dimensional tolerances or installation errors when installing or replacing different models of hub motors 700, allowing the test spline sleeve 300 to be more accurately aligned with the output end of the hub motor 700, further improving the precision and convenience of coaxiality adjustment.

[0034] Specifically, the fine-tuning component 600 includes a fixing block 610 and a fine-tuning screw 620. The fixing block 610 is mounted on the base frame assembly 100, and the fine-tuning screw 620 is threadedly connected to the fixing block 610. The fine-tuning screw 620 can abut against the bearing seat assembly 200. By rotating the fine-tuning screw 620, continuous and minute adjustments to the position of the bearing seat assembly 200 can be achieved. The self-locking characteristic of the thread also ensures stable position after adjustment, making it a low-cost and highly efficient precision adjustment mechanism.

[0035] Specifically, the base frame assembly 100 includes a bracket 110 and a connecting flange 120. The connecting flange 120 is detachably mounted on the bracket 110 and is used to mount the hub motor 700. Mounting the hub motor 700 via the detachable connecting flange 120 greatly improves the versatility and flexibility of the device. For hub motors 700 of different models and mounting interface sizes, only the matching connecting flange 120 needs to be replaced, without replacing the entire bracket 110, significantly reducing tooling costs and changeover time for testing different motors.

[0036] In this embodiment, the bearing housing assembly 200 is mounted on the bracket 110.

[0037] Furthermore, the bracket 110 has a structural hole 111, and the connecting flange 120 has a structural protrusion 121, which mates with the structural hole 111. Through the engagement of the structural protrusion 121 and the structural hole 111, rapid positioning and pre-installation of the connecting flange 120 on the bracket 110 are achieved. This concave-convex mating structure can accurately transmit radial force and torque, ensuring the repeatability of motor installation, while also enhancing the shear resistance of the connecting flange 120 during testing and improving the reliability of the connection.

[0038] Furthermore, the base frame assembly 100 also includes a large plate 130 and a support column 140. The large plate 130 is mounted on the support column 140, and the bracket 110 is mounted on the large plate 130. By setting the large plate 130 on the support column 140 and then mounting the bracket 110 on the large plate 130, a stable and highly integrated installation foundation is constructed. The large plate 130 provides a flat and spacious mounting surface for the bracket 110 and other components (such as the fixing block 610 of the fine-tuning assembly 600), which helps to ensure the installation accuracy of each component and the overall structural rigidity.

[0039] Preferably, the height of the support column 140 is adjustable. The height-adjustable support column 140 allows for adjustment of the overall levelness of the test platform. In actual installation environments, the ground may not be perfectly level; the adjustable support column 140 can compensate for ground unevenness, ensuring that the large plate 130 and all components mounted on it are in the correct level position. This is a fundamental prerequisite for ensuring precise alignment between the hub motor 700 and the transmission components.

[0040] Specifically, the floating assembly 500 includes an output spline sleeve 510, a first universal joint 520, a drive shaft 530, a second universal joint 540, and an input spline shaft 550. One end of the drive shaft 530 is connected to the output spline sleeve 510 via the first universal joint 520, and the output spline sleeve 510 is connected to the connecting shaft 400. The other end of the drive shaft 530 is connected to the input spline shaft 550 via the second universal joint 540, and the input spline shaft 550 is connected to the dynamometer. The combination of the first universal joint 520 and the second universal joint 540 can compensate for installation deviations and dynamic displacements between the dynamometer and the connecting shaft 400 in multiple degrees of freedom, such as axial, radial, and angular. The output spline sleeve 510 and the input spline shaft 550 allow for a certain amount of axial expansion and contraction. This design minimizes the requirements for the dynamometer's alignment accuracy and can absorb vibration and shock during dynamic testing, protecting the dynamometer and the tested hub motor 700.

[0041] In this embodiment, the process of conducting wheel hub motor 700 bench tests using the aforementioned wheel hub motor bench testing device is as follows: Preparation stage: Based on the model of the hub motor 700 under test, select the corresponding adapter flange from the tooling library and install it on the base frame assembly 100, and select the corresponding test spline sleeve 300 and assemble it on the hub motor 700 under test.

[0042] Installation and initial adjustments: First, the hub motor 700 is hoisted onto the base frame assembly 100, initially positioned using the structural protrusion 121 of the connecting flange 120, and the bolts are pre-tightened.

[0043] Next, the connecting shaft 400 is installed into the bearing housing assembly 200 and connected to the test spline sleeve 300 tooling.

[0044] Fine-tuning and centering: First, the deviations of the output end face of the hub motor 700 and the input end face of the connecting shaft 400 were measured respectively.

[0045] Secondly, the upward position of the connecting shaft 400 is finely adjusted by the fine-tuning component 600.

[0046] Then, repeatedly measure and adjust until the coaxiality meets the requirement of ≤0.05mm.

[0047] Final tightening and testing: First, tighten the locking devices of all adjustment mechanisms.

[0048] Next, connect the other end of the connecting shaft 400 to the floating assembly 500, and then dock and fix the floating assembly 500 to the dynamometer. Connect the cooling water pipes and the high and low voltage wiring harnesses, and the bench test can begin.

[0049] This embodiment also provides a method for testing using the above-described hub motor bench testing device, including: The hub motor 700 is mounted on the base frame assembly 100; Install the test spline sleeve 300 on the output end of the hub motor 700; The connecting shaft 400 is mounted on the bearing housing assembly 200, and one end of the connecting shaft 400 is connected to the test spline sleeve 300. Connect the other end of the connecting shaft 400 to the floating component 500; Connect the floating component 500 to the dynamometer.

[0050] First, this method ensures that the alignment reference of the entire transmission chain is established on a high-precision shaft system guaranteed by the bearing housing assembly 200. When connecting one end of the connecting shaft 400 to the test spline sleeve 300, since the connecting shaft 400 has been pre-installed on the precision bearing housing assembly 200, its rotation center has been determined. Docking at this point maximizes the coaxiality between the test spline sleeve 300 and the output end of the hub motor 700, minimizing installation errors. Second, this method places the connection of the floating assembly 500 as the final step, allowing it to fully utilize its deviation compensation function. After the accuracy at the power input end (test spline sleeve 300 side) is guaranteed by the bearing housing assembly 200, the floating assembly 500 connected at the rear end can independently and freely compensate for various installation deviations introduced by the dynamometer. This installation logic not only ensures the core alignment accuracy to protect the motor under test but also reduces the stringent requirements for dynamometer installation, achieving a perfect balance between testing accuracy and operational convenience.

[0051] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A hub motor test bench device, characterized in that, Includes base frame assembly, bearing housing assembly, test spline sleeve, connecting shaft, floating assembly and dynamometer; The base frame assembly is used to mount the hub motor. The connecting shaft is rotatably mounted on the bearing housing assembly. One end of the connecting shaft is connected to the test spline sleeve, which is connected to the output end of the hub motor. The other end of the connecting shaft is connected to the floating assembly, which is connected to the dynamometer.

2. The hub motor test bench as described in claim 1, characterized in that, The bearing housing assembly includes a base, an adjusting key, a mounting base, and fasteners. The mounting base is located on the base, and the base has a mounting groove for mounting the adjusting key. The mounting base has a sliding hole, and the adjusting key is located in the mounting groove and slides in cooperation with the sliding hole along the axial direction of the connecting shaft. The mounting base has a shaft hole, and the connecting shaft is rotatably mounted in the shaft hole. The mounting base has a fixing groove, and the fastener passes through the fixing groove and is detachably and fixedly connected to the base.

3. The hub motor test bench as described in claim 1, characterized in that, The bearing housing assembly is mounted on the base frame assembly.

4. The hub motor test bench as described in claim 3, characterized in that, It also includes a fine-tuning component, which is mounted on the base frame assembly and is used to adjust the position of the bearing housing assembly in a horizontal direction perpendicular to the axis of the connecting shaft.

5. The hub motor test bench as described in claim 4, characterized in that, The fine-tuning component includes a fixing block and a fine-tuning screw. The fixing block is mounted on the base frame assembly, and the fine-tuning screw is threadedly connected to the fixing block. The fine-tuning screw can abut against the bearing seat assembly.

6. The hub motor test bench as described in claim 1, characterized in that, The base frame assembly includes a bracket and a connecting flange, which is detachably mounted on the bracket and is used to mount the hub motor.

7. The hub motor test bench as described in claim 6, characterized in that, The bracket has a structural hole, and the connecting flange has a structural protrusion that mates with the structural hole.

8. The hub motor test bench as described in claim 6, characterized in that, The base frame assembly also includes a large plate and a support column, the large plate being mounted on the support column and the bracket being mounted on the large plate.

9. The hub motor test bench as described in claim 1, characterized in that, The floating assembly includes an output spline sleeve, a first universal joint, a drive shaft, a second universal joint, and an input spline shaft. One end of the drive shaft is connected to the output spline sleeve via the first universal joint, and the output spline sleeve is connected to the connecting shaft. The other end of the drive shaft is connected to the input spline shaft via the second universal joint, and the input spline shaft is connected to the dynamometer.

10. A method for testing a hub motor using the test apparatus described in any one of claims 1-9, characterized in that, include: The hub motor is mounted on the chassis assembly; Install the test spline sleeve on the output end of the hub motor; Install the connecting shaft on the bearing housing assembly and connect one end of the connecting shaft to the test spline sleeve; Connect the other end of the connecting shaft to the floating component; Connect the floating component to the dynamometer.

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