Test bench of built-in motor of electric power-assisted bicycle

Abstract

The utility model discloses a test bench for a built-in motor of an electric power-assisted bicycle. The test bench comprises a bench bottom plate, and a pedal force simulation motor, a load device and a tensioning wheel assembly which are installed on the bench bottom plate. An output shaft of the pedal force simulation motor is connected with a middle shaft of the to-be-tested middle motor through a first coupling, and provides a rotating speed and a torque for the pedal of a person when the electric power-assisted bicycle is simulated to be ridden for the to-be-tested middle motor; an output shaft of the load device is connected with a flywheel through a second coupler, a chain wheel is arranged on a middle shaft of the to-be-tested middle motor and connected with the flywheel through a transmission chain, and the load device provides load torque for the to-be-tested middle motor; the tensioning wheel assembly comprises a support and a tensioning wheel. The tensioning wheel is meshed with the transmission chain; when the height of the support is changed, the distance between the tensioning wheel and the rack bottom plate is changed, and the tightness degree of the transmission chain is adjusted. According to the utility model, the tightness of the transmission chain can be simulated when the electric power-assisted bicycle is ridden, and the performance of the mid-motor can be tested.

Description

Technical Field

[0001] This utility model relates to a test bench for a mid-drive motor of an electric-assist bicycle, belonging to the field of motor technology. Background Technology

[0002] Mid-drive motors are widely used in electric-assist bicycles. The mid-drive motor is mounted in the middle of the bicycle, resulting in a compact and efficient structure and good riding stability. Because the mid-drive motor does not directly bear the load, it offers stronger power performance, making it the preferred design for electric-assist bicycles.

[0003] Since the durability of the mid-drive motor directly determines its service life and also directly affects its reliability and safety, it is necessary to test the mechanical properties of the mid-drive motor to ensure product quality.

[0004] Patent document CN218470925U discloses a performance testing simulation device for a mid-drive motor used in electric bicycles. It simulates the riding and braking states of an electric bicycle through a power output module and a braking force output module, respectively. Using a motion test board and some professional test components, it tests a series of parameters such as the output power, output torque, output current, and continuity of the motor output line under normal and braking conditions. However, this design only simulates the rotation of the inner and outer shafts of the mid-drive motor and does not consider the influence of the transmission chain on the mid-drive motor when it is used on an electric bicycle. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a test bench for the mid-drive motor of an electric-assist bicycle, which can simulate the tension of the drive chain when riding an electric-assist bicycle and test the performance of the mid-drive motor.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] In a first aspect, this utility model provides a test bench for a mid-mounted motor of an electric-assisted bicycle, comprising: a bench base plate and a pedal force simulation motor, a load device, and a tension wheel assembly mounted on the bench base plate;

[0008] The output shaft of the pedal force simulation motor is connected to the central shaft of the motor under test via a first coupling, which is used to provide the motor under test with the speed and torque of a person's foot pedaling when riding an electric-assisted bicycle.

[0009] The output shaft of the load device is connected to the flywheel via a second coupling. The central shaft of the motor under test is equipped with a sprocket, which is connected to the flywheel via a transmission chain. The load device is used to provide load torque to the central motor under test.

[0010] The tension wheel assembly includes a bracket and a tension wheel; one end of the bracket is fixed to the base plate of the platform, and the other end is connected to the tension wheel; the tension wheel meshes with the transmission chain; when the height of the bracket changes, the distance between the tension wheel and the base plate of the platform changes, which is used to adjust the tension of the transmission chain.

[0011] In conjunction with the first aspect, the load device may optionally be any one of a load motor, an adjustable flywheel, and an electromagnetic brake.

[0012] In conjunction with the first aspect, optionally, when the load device is a load motor, a second reducer is provided between the output shaft of the load motor and the second coupling, and the second reducer is used to amplify the torque of the load motor.

[0013] In conjunction with the first aspect, optionally, the base plate of the test bench is provided with multiple dovetail grooves, which are used to install the foot pedal simulation motor, load device, test-mode motor and tensioning wheel assembly.

[0014] In conjunction with the first aspect, optionally, the system further includes a first reducer disposed between the output shaft of the pedal force simulation motor and the first coupling, the first reducer being used to amplify the output torque of the pedal force simulation motor.

[0015] In conjunction with the first aspect, the system may optionally include a power supply assembly, which includes a DC power supply for powering the motor under test and an AC power supply for powering the foot pedal simulation motor and the load device.

[0016] In conjunction with the first aspect, optionally, it also includes a PC;

[0017] The output terminal of the PC is connected to the input terminal of the driver of the foot pedal simulation motor. The driver of the foot pedal simulation motor is used to adjust the voltage applied to the phase line of the stator to generate different magnetic fields in order to adjust the speed and torque output by the foot pedal simulation motor.

[0018] In conjunction with the first aspect, optionally, when the load device is a load motor, the output terminal of the PC is connected to the input terminal of the driver of the load motor, and the driver of the load motor is used to adjust the voltage applied to the phase line of the stator so that the stator generates different magnetic fields to adjust the load torque output by the load motor.

[0019] When the load device is an adjustable moment of inertia flywheel, the output terminal of the PC is connected to the input terminal of the adjustable moment of inertia flywheel regulator. The adjustable moment of inertia flywheel regulator is used to adjust the moment of inertia of the flywheel so that the adjustable moment of inertia flywheel outputs different load torques.

[0020] In conjunction with the first aspect, optionally, the electromagnetic brake can adjust the load torque output by the electromagnetic brake by means of an adjusting screw provided on the end cover of the electromagnetic brake.

[0021] Compared with the prior art, the beneficial effects achieved by the test bench for a mid-drive motor of an electric-assist bicycle provided in this embodiment of the invention include:

[0022] The output shaft of the pedal force simulation motor provided by this utility model is connected to the central shaft of the motor under test through a first coupling, which is used to provide the motor under test with the speed and torque of a person's foot pedaling when riding an electric-assisted bicycle; this utility model can simulate the speed and torque of a person's foot pedaling when riding an electric-assisted bicycle.

[0023] The output shaft of the load device provided by this utility model is connected to the flywheel through a second coupling. The central shaft of the motor under test is provided with a chain, which is connected to the flywheel through a transmission chain. The load device is used to provide load torque to the central motor under test. This utility model can simulate the load borne by the central motor when riding an electric-assisted bicycle.

[0024] The tension wheel assembly provided by this utility model includes a bracket and a tension wheel; one end of the bracket is fixed to the base plate of the test bench, and the other end is connected to the tension wheel; the tension wheel meshes with the drive chain; when the height of the bracket changes, the distance between the tension wheel and the base plate of the test bench changes, which is used to adjust the tension of the drive chain; this utility model can adjust the tension of the drive chain, can simulate the tension of the drive chain when riding an electric-assisted bicycle, and can test the performance of the mid-drive motor when riding an electric-assisted bicycle. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of a test bench for a mid-drive motor of an electric bicycle, provided for an embodiment of this utility model, showing the load device using a load motor;

[0026] Figure 2 This is a schematic diagram of the structure of a test bench for a mid-mounted motor of an electric-assist bicycle, provided as an embodiment of the present invention, in which the load device adopts an adjustable flywheel.

[0027] In the picture:

[0028] 1. Foot pedal force simulated motor; 2. First reducer; 3. First coupling; 4. Central motor assembly; 5. Drive chain; 6. Tensioner assembly; 7. Flywheel; 8. Second coupling; 9. Second reducer; 10. Load motor; 11. Adjustable moment of inertia flywheel. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be noted that the terms "upper / lower end," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "set / set up," "sleeve," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this embodiment, the following is provided: Figure 1 and Figure 2 The test bench shown includes a mid-drive motor for an electric-assisted bicycle, comprising a bench base plate, a pedal force simulation motor, a first reducer, a first coupling, a drive chain, a tension wheel assembly, a flywheel, a second coupling, and a load device.

[0033] The foot-operated simulated motor, tensioner assembly, load device, and under-test motor are mounted on the test bench base plate. The test bench base plate has multiple dovetail grooves for mounting the foot-operated simulated motor, load device, under-test motor, and tensioner assembly.

[0034] Specifically, the foot pedal simulation motor, load device, test-mode motor, and tension wheel assembly are connected to the dovetail groove with bolts, avoiding drilling holes in the test bench base plate and extending the service life of the test bench base plate.

[0035] This embodiment provides an example of a platform base plate. The platform base plate is a rectangular base plate, and the dovetail grooves include longitudinal dovetail grooves and transverse dovetail grooves. The longitudinal dovetail grooves are parallel to the width of the rectangular base plate, and the spacing between the longitudinal dovetail grooves is no more than 10 cm. The transverse dovetail grooves are parallel to the length of the rectangular base plate, and the spacing between the transverse dovetail grooves is no more than 5 cm.

[0036] The tension wheel assembly includes a bracket and a tension wheel. One end of the bracket is fixed to the base plate of the frame, and the other end is connected to the tension wheel. The tension wheel meshes with the drive chain. When the height of the bracket changes, the distance between the tension wheel and the base plate of the frame changes, thereby adjusting the tension of the drive chain.

[0037] In this embodiment, one end of the bracket is fixed in the dovetail groove.

[0038] This embodiment can adjust the tension of the drive chain to ensure that it does not loosen and malfunction. Furthermore, this embodiment can simulate the tension of the drive chain during electric-assisted bicycle riding, and can test the performance of the mid-drive motor under different drive chain tensions, thereby obtaining the most suitable drive chain tension.

[0039] like Figure 1 and Figure 2 As shown, the output shaft of the pedal force simulation motor is connected to the central shaft of the mid-drive motor under test through the first coupling, which is used to provide the mid-drive motor under test with the speed and torque of a person's foot pedaling when riding an electric-assisted bicycle.

[0040] In this embodiment, the maximum output speed of the foot pedal simulated motor is 300 pm, the maximum output torque is 150 Nm, the rated power is 300 W, and the maximum power is 1000 W.

[0041] The first reducer is located between the output shaft of the foot pedal force simulation motor and the first coupling. The first reducer is used to amplify the output torque of the foot pedal force simulation motor.

[0042] like Figure 1 and Figure 2 As shown, the output shaft of the load device is connected to the flywheel through a second coupling. The central shaft of the motor under test is equipped with a sprocket, which is connected to the flywheel through a transmission chain. The load device is used to provide load torque to the central motor under test.

[0043] like Figure 1 and Figure 2 As shown, the first coupling and the second coupling are couplings obtained by combining two half couplings.

[0044] The load device can be any one of a load motor, an adjustable flywheel, or an electromagnetic brake.

[0045] When the load device is a load motor, a second reducer is provided between the output shaft of the load motor and the second coupling. The second reducer is used to amplify the torque of the load motor.

[0046] like Figure 1 As shown, the load device is a load motor, with a maximum output speed of 500 rpm, a maximum output torque of 100 Nm, a rated power of 500 W, and a maximum power of 1200 W.

[0047] like Figure 2 As shown, the load device is an adjustable moment of inertia flywheel, and the maximum moment of inertia of the adjustable moment of inertia flywheel is 210 kgm^2.

[0048] The load device is an electromagnetic brake, such as a magnetic powder brake.

[0049] This embodiment provides a test bench for a mid-drive motor of an electric-assist bicycle, which also includes a power supply assembly. The power supply assembly includes a DC power supply for powering the mid-drive motor under test and an AC power supply for powering the pedal force simulation motor and the load device.

[0050] Furthermore, by using a common busbar, the foot-operated motor and load device eliminate the braking resistor, thus reducing energy consumption.

[0051] This embodiment provides a test bench for a mid-drive motor of an electric-assist bicycle, which also includes a PC and multiple torque and speed sensors.

[0052] The torque and speed sensor connects to the output shaft of the foot pedal force analog motor and the output shaft of the load device, and is used to output the collected torque and speed data to the input terminal of the PC.

[0053] In this embodiment, PC is an abbreviation for Personal Computer.

[0054] The output of the PC is connected to the input of the driver of the foot pedal simulation motor. The driver of the foot pedal simulation motor is used to adjust the voltage applied to the phase line of the stator to generate different magnetic fields in order to adjust the speed and torque output of the foot pedal simulation motor.

[0055] In this embodiment, the driver of the foot pedal force simulation motor is model SGES-C43A-15B.

[0056] When the load device is a load motor, the output terminal of the PC is connected to the input terminal of the load motor driver. The load motor driver is used to adjust the voltage applied to the phase line of the stator to generate different magnetic fields in order to adjust the load torque output by the load motor.

[0057] In this embodiment, the driver for the load motor is model SGES-C43A-15B.

[0058] When the load device is an adjustable moment of inertia flywheel, the output terminal of the PC is connected to the input terminal of the adjustable moment of inertia flywheel regulator. The adjustable moment of inertia flywheel regulator is used to adjust the moment of inertia of the flywheel so that the adjustable moment of inertia flywheel outputs different load torques.

[0059] In this embodiment, the regulator of the adjustable flywheel is model SC-1WS.

[0060] When the load device is an electromagnetic brake, the load torque output by the electromagnetic brake is adjusted by the adjusting screw set on the end cover of the electromagnetic brake.

[0061] Specifically, rotating the adjusting screw clockwise will increase the load torque of the electromagnetic brake, while rotating it counterclockwise will decrease the load torque.

[0062] This invention can test the performance of the mid-drive motor when riding an electric-assisted bicycle, and can test the performance of the mid-drive motor when the drive chain is at different tensions, thereby obtaining the most suitable drive chain tension.

[0063] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0064] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0065] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test bench for a mid-drive motor of an electric-assisted bicycle, characterized in that, include: The test bench base plate and the foot pedal simulation motor, load device and tension wheel assembly mounted on the test bench base plate; The output shaft of the pedal force simulation motor is connected to the central shaft of the motor under test via a first coupling, which is used to provide the motor under test with the speed and torque of a person's foot pedaling when riding an electric-assisted bicycle. The output shaft of the load device is connected to the flywheel via a second coupling. The central shaft of the motor under test is equipped with a sprocket, which is connected to the flywheel via a transmission chain. The load device is used to provide load torque to the central motor under test. The tension wheel assembly includes a bracket and a tension wheel; one end of the bracket is fixed to the base plate of the platform, and the other end is connected to the tension wheel; the tension wheel meshes with the transmission chain; when the height of the bracket changes, the distance between the tension wheel and the base plate of the platform changes, which is used to adjust the tension of the transmission chain.

2. The test bench for the mid-drive motor of an electric-assisted bicycle according to claim 1, characterized in that, The load device is any one of a load motor, an adjustable flywheel, and an electromagnetic brake.

3. The test bench for the mid-drive motor of an electric-assisted bicycle according to claim 2, characterized in that, When the load device is a load motor, a second reducer is provided between the output shaft of the load motor and the second coupling. The second reducer is used to amplify the torque of the load motor.

4. The test bench for the mid-drive motor of an electric-assisted bicycle according to claim 1, characterized in that, The base plate of the test bench is provided with multiple dovetail grooves, which are used to install the foot pedal force simulation motor, load device, test-mode motor and tension wheel assembly.

5. The test bench for the mid-drive motor of an electric-assisted bicycle according to claim 1, characterized in that, It also includes a first reducer disposed between the output shaft of the pedal force simulation motor and the first coupling, the first reducer being used to amplify the output torque of the pedal force simulation motor.

6. The test bench for the mid-drive motor of an electric-assisted bicycle according to claim 1, characterized in that, It also includes a power supply assembly, which includes a DC power supply for powering the motor under test and an AC power supply for powering the foot pedal simulation motor and the load device.

7. The test bench for the mid-drive motor of an electric-assisted bicycle according to claim 2, characterized in that, Also includes PC; The output terminal of the PC is connected to the input terminal of the driver of the foot pedal simulation motor. The driver of the foot pedal simulation motor is used to adjust the voltage applied to the phase line of the stator to generate different magnetic fields in order to adjust the speed and torque output by the foot pedal simulation motor.

8. The test bench for the mid-drive motor of an electric-assisted bicycle according to claim 7, characterized in that, When the load device is a load motor, the output terminal of the PC is connected to the input terminal of the driver of the load motor. The driver of the load motor is used to adjust the voltage applied to the phase line of the stator so that the stator generates different magnetic fields to adjust the load torque output by the load motor. When the load device is an adjustable moment of inertia flywheel, the output terminal of the PC is connected to the input terminal of the adjustable moment of inertia flywheel regulator. The adjustable moment of inertia flywheel regulator is used to adjust the moment of inertia of the flywheel so that the adjustable moment of inertia flywheel outputs different load torques.

9. The test bench for the mid-drive motor of an electric-assisted bicycle according to claim 2, characterized in that, The electromagnetic brake's output load torque is adjusted by adjusting screws located on the end cap of the electromagnetic brake.

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