Wheel coupling dynamometer system

Abstract

The application relates to the field of automobile detection equipment, and particularly discloses a wheel coupling dynamometer system. The wheel coupling dynamometer system comprises a plurality of dynamometer devices, the dynamometer device comprises a supporting seat and a transmission unit, the transmission unit comprises a steel belt, a driving wheel, a driven wheel and a power piece, the steel belt is tensioned on the driving wheel and the driven wheel, and the power piece drives the steel belt to move; the supporting seat is located between the driving wheel and the driven wheel and below the top of the steel belt, a water inlet cavity is arranged in the supporting seat, the top of the supporting seat is provided with a plurality of supporting grooves, the bottom of the supporting groove is provided with a drainage channel for connecting the water inlet cavity and the supporting groove, and a water inlet is arranged in the side wall of the supporting seat and connected with the water inlet cavity; and a backwater inlet is arranged in the side wall of the supporting groove. The wheel coupling dynamometer system can support the automobile without disassembling the tire, can make the automobile simulate the driving state on a flat road, can couple more dynamic test working conditions, and can reproduce more real road working conditions.

Description

Technical Field

[0001] This invention relates to the field of automotive testing equipment, and more specifically to a wheel coupling dynamometer system. Background Technology

[0002] During the design and production of automobiles, testing is required after the vehicle assembly is completed. Road simulation-based vehicle testing is a crucial type of testing, primarily assessing key performance aspects such as vehicle power, fuel economy (fuel consumption), emissions under various operating conditions, electric vehicle range, and engine cooling capacity. It also includes tests such as continuous steep incline and hilly terrain simulations, and continuous constant-speed descent simulations (Type II and Type IIA). Traditional vehicle testing is conducted on outdoor roads. However, with advancements in automotive technology, testing requirements have increased in precision and the use of more equipment. Road testing becomes susceptible to the influence of various factors in the outdoor environment, compromising accuracy. Furthermore, road construction is costly, testing safety is compromised, and the high speed of the vehicle makes it difficult to use various testing equipment. Therefore, laboratory testing is now preferred. This necessitates the use of specialized equipment connected to the vehicle to simulate driving conditions.

[0003] Currently, chassis dynamometers are commonly used to support vehicles and simulate their driving conditions due to their convenience, lower cost, higher accuracy, and reduced difficulty in testing. However, most current methods simulate steering resistance in addition to longitudinal road resistance. This necessitates the dynamometer system rotating with the wheels, but the large mass of the drum makes it very difficult to rotate, and its high inertia makes it difficult to meet the rapid response requirements of current electrification. Therefore, it is difficult to implement a dynamometer system that rotates with the wheels. To solve these problems, some dynamometers test vehicles with their tires removed. However, this results in differences in the direction of force transmission and work done compared to when the vehicle is actually driving on the road, affecting the testing accuracy. To improve accuracy, a high-precision and realistic tire model is needed, which increases the testing cost and does not provide a realistic simulation. Therefore, a method is needed that can support the vehicle without removing the tires and simulate its driving conditions on the road, making the test results closer to those of a vehicle actually driving on the road. Summary of the Invention

[0004] The present invention aims to provide a wheel-coupled dynamometer system that supports a car without removing the tires, allowing the car to simulate the driving state on a smooth road, coupled with more dynamic test conditions, and reproduces more realistic road conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a wheel coupling dynamometer system, comprising multiple dynamometer devices, each dynamometer device including a support base and a transmission unit, the transmission unit including a steel belt, a driving wheel, a driven wheel, and a power component, the steel belt being tensioned on the driving wheel and the driven wheel, the power component driving the steel belt to move; the support base is located between the driving wheel and the driven wheel and below the top of the steel belt, the support base having a water inlet chamber, the top of the support base having several support grooves, the bottom of the support grooves having a drainage channel connecting the water inlet chamber and the support grooves, the side wall of the support base having a water inlet communicating with the water inlet chamber; the side wall of the support grooves having a water return port.

[0006] The beneficial effects of this plan are:

[0007] 1. The steel belt in this solution can support the tire. When the car is moving, the drive wheel drives the steel belt to transmit power, similar to a treadmill, so that the car does not move forward relative to the ground. Therefore, the test can be simulated indoors to simulate the car driving on the road. Since the tire does not need to be removed, the test results are closer to the real driving situation and the test accuracy is higher.

[0008] 2. In addition to the tension provided by the driving and driven pulleys to the steel belt, the support seat in this design is located below the top of the steel belt, providing support to the portion of the steel belt between the driving and driven pulleys, thus preventing the steel belt from bending downwards under the load of the car tires. During testing, high-pressure water is introduced into the water inlet chamber through the inlet. The high-pressure water is then sprayed out from the drainage channel and impacts the steel belt, creating a static pressure support force.

[0009] Secondly, during the testing process, the steel belt moves relative to the support base. This movement causes the water entering the support groove from the drainage channel to move forward. When the water reaches the top of the support base, it generates a dynamic pressure effect. Furthermore, the height difference between the top of the support base and the support groove causes the water to exert upward dynamic pressure on the steel belt. Compared to simply using upward water pressure to create support force, this solution uses water to transfer pressure to the support base, resulting in better support and making the test results closer to those of a vehicle driving on the road, thus further improving the testing accuracy.

[0010] 3. The water at the top of the entire support base can provide dynamic pressure to the steel strip. The support area is large, the pressure per unit area is small, and the requirements for the strength of the support base material are low. Furthermore, the greater the pressure on the steel strip, the smaller the gap between the steel strip and the support base, the smaller the cross-section of the water flow, the greater the pressure generated, and the greater the dynamic pressure generated. In turn, when the local pressure on the steel strip is too high, it provides additional local support force for the steel strip.

[0011] 4. When supporting the steel belt, water first enters the inlet chamber and then exits through the drainage channel. Therefore, the water pressure at each drainage channel is similar, which ensures that the water flow provides uniform support for the steel belt, thus ensuring the flatness of the steel belt and preventing the wheel from shifting during the car experiment, which would affect the experimental data.

[0012] Furthermore, the top of the support base is provided with two sealing groups, which are distributed sequentially along the length of the steel strip and located on both sides of the support groove. Both sealing groups include a first sealing strip, the top of which is higher than the top of the support base.

[0013] The beneficial effects of this solution are: the two sealing groups can limit the water flowing out of the support groove, preventing a large amount of water from moving with the steel belt to the front of the support seat and dripping down onto the ground or other structures, reducing water waste and also preventing water accumulation on the ground from being difficult to clean or slippery.

[0014] Furthermore, the top of the support base is provided with an upward-facing limiting groove, the lower end of the first sealing strip is located in the limiting groove and slides in cooperation with the limiting groove, and a first spring is provided in the limiting groove, the upper end of the first spring abutting against the first sealing strip.

[0015] The beneficial effects of this solution are as follows: under the action of the first spring, the first sealing strip abuts against the steel strip, improving the sealing effect between the steel strip and the top of the support seat, and further preventing a large amount of water from flowing out.

[0016] Furthermore, the top of the support base is also provided with two sets of air knife nozzles, which are distributed along the width direction of the steel strip and are located on both sides of the support groove.

[0017] The beneficial effects of this solution are as follows: after connecting the air knife nozzle to an external device that can generate high-pressure gas, high-pressure gas can flow out from the air knife nozzle. The high-pressure gas blows towards the steel belt, and a very small amount of water flowing out from below the steel belt is blown back, preventing a large amount of water from flowing out from both sides of the steel belt.

[0018] Furthermore, a steering unit is provided below the transmission unit. The steering unit includes a base and a rotating component. The transmission unit is located on the base, and the rotating component is used to drive the base to rotate.

[0019] The beneficial effects of this solution are as follows: During the test, the rotating component in this solution drives the base to rotate, which in turn causes the transmission unit to rotate. The steel belt of the transmission unit is used to support the tire. Therefore, when the car tire turns, the steel belt under the tire can rotate accordingly, ensuring that the steel belt can support the tire.

[0020] Furthermore, adjustment units are provided on both sides of the driven wheel. Each adjustment unit includes a connecting rod, a pushing member, a fixed seat, and a swing seat. The swing seat is ball-hinged with the fixed seat. The pushing member is ball-connected with the fixed seat and is used to push the fixed seat to swing. The connection position between the swing seat and the fixed seat is offset from the pushing direction of the pushing member. The two connecting rods are rotatably connected to the two fixed seats respectively.

[0021] The beneficial effects of this solution are as follows: The steel belt in this solution is used for automobile testing. Because the automobile needs to simulate driving conditions, the maximum rotation speed of the automobile tires during testing reaches 60m / s. In order to prevent the automobile tires from rotating faster than the steel belt and moving forward relative to the steel belt, causing the automobile to fall off the steel belt, the steel belt needs to transmit at the same high speed. However, when the steel belt deviates laterally under high-speed transmission, it is difficult to correct the deviation of the steel belt by directly adjusting the steel belt.

[0022] In this design, the two connecting rods are used to support the steel belt and coaxially connect to both ends of the driven pulley. After the steel belt deviates, the fixed seat is pushed by the pusher, which in turn drives the driven pulley to swing through the connecting rods. Since the steel belt is tensioned by the driven pulley, the tension force on the steel belt at both ends of the driven pulley changes after the driven pulley swings, causing the steel belt to slide towards the side with reduced tension. Therefore, this design can adjust the steel belt without direct contact with it, making the adjustment safer. Furthermore, when inspecting heavier vehicles, the pusher can also push the driven pulley away from the driving pulley to improve the tension of the steel belt and prevent the steel belt from bending.

[0023] Furthermore, the power component is an external rotor motor that serves as the driving wheel, including an external rotor, a stator, a cooling water circuit, a braking structure, a bearing assembly, an external rotor support for supporting the external rotor, and a stator support for supporting the stator. The external rotor is sleeved on the outside of the stator and rotatably connected to the stator. The external rotor includes a rotor section and a fixed section. The external rotor support is rotatably connected to the fixed section through the bearing assembly. Both ends of the stator are rotatably connected to the external rotor. The stator is supplied with a three-phase AC power supply, and the external rotor is supplied with a DC power supply. The cooling water circuit extends into the stator and is connected to an external water pipe to cool the stator. The vehicle structure includes brake pads and a brake system. A flange is fixed to the end of the fixed section, and the flange is fixedly connected to the brake pads. The brake system can brake the brake disc.

[0024] The beneficial effects of this plan are:

[0025] 1. Unlike ordinary motors, the power components in this solution can operate stably and continuously. The principle of this technical solution is as follows: when three-phase alternating current is applied to the stator, a rotating magnetic field is generated in the air gap. When direct current is applied to the outer rotor, a constant magnetic field is generated. The outer rotor's magnetic field rotates synchronously with the stator's rotating magnetic field due to the magnetic pull of the stator's magnetic field. Heat is generated during motor operation. Traditional servo motors have the rotor located inside the stator. When the stator heats up during operation, it can be effectively cooled by air convection due to its external location. However, for an outer rotor motor, heat dissipation is difficult because the stator is located inside. The different thermal expansion coefficients of various parts inside the motor can cause changes in structural stress and slight variations in the internal air gap, affecting the motor's operational accuracy. Water cooling effectively avoids these problems. In this technical solution, the stator is located inside the outer rotor, facilitating the connection of cooling water. Furthermore, the outer rotor support and stator support provide support for the outer rotor and stator respectively, ensuring the motor's operational stability.

[0026] 2. Compact structure and large moment of inertia. Compared to internal rotor motors of the same volume, external rotor motors have higher output torque and larger moment of inertia, which is beneficial to improving the stability of the motor system. On the other hand, external rotor motors have smaller axial dimensions and lower center of gravity, making them suitable for a wide range of applications. Simultaneously, overall dynamic balancing ensures even stress distribution on both bearings, resulting in stable operation within a specified speed range. The stator of the external rotor motor is integrated inside the rotor, effectively reducing unnecessary space between the motor and the equipment, resulting in a relatively small size. Furthermore, the external rotor motor has a simple structure, is easy to assemble and disassemble, and has low maintenance costs.

[0027] 3. By fixing the flange, the contact area between the flange and the brake pad is larger, which can better brake the motor; by setting the brake structure, the motor can be braked, which facilitates the automation of the motor.

[0028] Furthermore, the two regulating units have a first pusher and a second pusher, respectively, and are equipped with at least one servo valve. The rod chamber of the first pusher and the rodless chamber of the second pusher are connected to the same outlet of the servo valve; the rodless chamber of the first pusher and the rod chamber of the second pusher are also connected to the same outlet of the servo valve.

[0029] The beneficial effects of this solution are: the differential connection of the hydraulic cylinder enables the steel belt to be quickly corrected when it is moving at high speed.

[0030] Furthermore, the adjustment unit also includes a sensor, which is electrically connected to the pusher.

[0031] The beneficial effects of this solution are: the position of the steel strip can be detected in real time through the sensor, and the deviation of the steel strip can be corrected in time.

[0032] Furthermore, a cylindrical roller bearing is provided between one of the connecting rods and the fixed seat.

[0033] The beneficial effects of this solution are as follows: During correction, the maximum rotation angle of the driven wheel is approximately 1°, and adjusting a smaller angle is sufficient to reverse the steel belt and reset it. When the driven wheel rotates, the cylindrical roller bearing can provide several millimeters of axial movement space for the connecting rod, compensating for the change in axial length between the driven wheel shaft and its connecting bearing housing during the tilting process of the driven wheel. Attached Figure Description

[0034] Figure 1 This is a perspective view of an embodiment of the present invention;

[0035] Figure 2 This is a perspective view of the support unit in an embodiment of the present invention;

[0036] Figure 3 for Figure 2 Top view;

[0037] Figure 4 for Figure 2 The frontal vertical sectional view;

[0038] Figure 5 This is a schematic diagram of the driven wheel oscillation in an embodiment of the present invention;

[0039] Figure 6 This is a cross-sectional view of the power component in an embodiment of the present invention. Detailed Implementation

[0040] The following detailed description illustrates the specific implementation method:

[0041] The reference numerals in the accompanying drawings include: fixed base 1, sensor 11, pusher 2, connecting rod 3, swing seat 4, protrusion 41, steel belt 5, drive wheel 51, outer rotor 511, cooling water channel 512, outer rotor support 513, stator support 514, rotor part 515, fixed part 516, brake pad 517, brake 518, flange 519, angular contact bearing assembly 511, deep groove ball bearing 5111, cylindrical roller bearing 5112, stator 5114, driven wheel 52, water tank 6, return water chamber 61, base frame 62, frame 7, rotating part 71, base 72, bracket 72, support plate 8, groove 81, throttling bolt 82, partition 9, air knife edge 91, return water port 92, first sealing strip 93, second sealing strip 94, water inlet chamber 95, water inlet 96, first spring 97.

[0042] Example

[0043] A wheel-coupled dynamometer system, such as Figure 1As shown, the vehicle includes multiple dynamometers. In this embodiment, there are four dynamometers, each corresponding to one of the four tires of the vehicle. In actual implementation, when the vehicle is small or lightweight, two dynamometers can be provided so that the two dynamometers support the tires on both sides of the vehicle respectively. When the number of tires of the vehicle is greater than or less than four, the number of dynamometers is the same as the number of tires, with each dynamometer supporting one tire.

[0044] The dynamometer includes a frame 7, a support base, a transmission unit, a steering unit, and two adjustment units. The steering unit includes a base 72 and a rotating component 71. The base 72 is horizontal, and a rotating shaft is provided at the bottom of the base 72 via a flange. The lower end of the rotating shaft passes through the frame 7 and is connected to the rotating component 71 via a coupling. In this embodiment, the rotating component 71 is a stepper motor. Specifically, the rotating component 71 can also be connected to the rotating shaft via a reducer to drive the base 72 to rotate.

[0045] The transmission unit is mounted on the base 72 and includes a steel belt 5, a driving pulley 51, a driven pulley 52, and a power unit. A bracket 72 is bolted to the base 72, and the driving pulley 51 is mounted on the frame 7 via bearings. The driven pulley 52 is located to the right of the driving pulley 51. The steel belt 5 is annular and tensioned between the driving pulley 51 and the driven pulley 52. ​​The power unit uses an external rotor motor, which serves as the driving pulley 51. Specifically, as shown... Figure 6As shown, the external rotor motor includes an external rotor 511, a cooling water channel 512, a braking structure, an external rotor support 513 supporting the external rotor 511, and a stator support 514 supporting the stator 5114. The external rotor 511 is sleeved on the outside of the stator 5114 and rotatably connected to the stator 5114. The external rotor 511 includes a rotor portion 515 and a fixed portion 516. The fixed portion 516 is rotatably connected to the external rotor support 513 via an angular contact bearing assembly 511. The angular contact bearing assembly 511 includes two sets of angular contact bearings arranged back-to-back. The external rotor support 513 supports the fixed portion. 516 further supports the rotor 515. Both ends of the stator 5114 are rotatably connected to the outer rotor 511 via bearings. The left end of the stator 5114 has a protrusion 41, and the opposite surface of the rotor 515 has a groove 81 to accommodate the protrusion 41. A deep groove ball bearing 5111 is fitted on the outer surface of the protrusion 41 and rotatably connected to the outer rotor 511. The deep groove ball bearing 5111 can withstand the radial load of the stator 5114. The right end of the stator 5114 is rollingly connected to the outer rotor 511 via a cylindrical roller bearing 5112. The axial floating amount of the cylindrical roller bearing 5112 compensates for the displacement of the internal structure of the motor due to thermal expansion and contraction. The stator 5114 is supplied with a three-phase AC power supply, and the outer rotor 511 is supplied with a DC power supply. The cooling water passage 512 extends into the stator 5114 and is spirally arranged in the stator 5114. The cooling water passage 512 includes an inlet 96 and an outlet. The inlet 96 is connected to the external cooling water to fully cool the stator 5114.

[0046] The braking structure includes brake pads 517 and a brake 518. A flange 519 is bolted to the end of the fixing part 516. The flange 519 is bolted to the brake pads 517, and the brake 518 can brake the brake disc. By fixing the flange 519, the contact area between the flange 519 and the brake pads 517 is larger, resulting in a larger fixing area and more stable braking. The braking structure can also brake the motor.

[0047] like Figure 2 , Figure 4As shown, the support base is an inverted trapezoid, located between the driving wheel 51 and the driven wheel 52, below the top of the steel belt 5. In this embodiment, the support base includes a water tank 6, a support plate 8, a partition plate 9, and a base frame 62. The water tank 6 is mounted on the base 72 with screws. The base frame 62 is located inside the water tank 6 and welded to the bottom of the water tank 6. The partition plate 9 is located on the base frame 62 and welded to the base frame 62. The support plate 8 is located inside the partition plate 9 and fixed to the partition plate 9 with screws. A return water chamber 61 is formed between the partition plate 9 and the side wall of the water tank 6. A water inlet chamber 95 is provided inside the partition plate 9. The bottom of the partition plate 9 is provided with a water inlet 96 communicating with the return water chamber 61. Specifically, in this embodiment, the water inlet 96 is connected to a water pump. The water inlet end of the water pump is connected to the return water chamber 61 to introduce water from the return water chamber 61 into the water inlet chamber 95. In actual implementation, the return water chamber 61 can also be connected to an external water tank or other container, and the water in the return water chamber 61 can be introduced into the water tank through a water pump. After the water in the water tank is cooled down, it can be introduced back into the return water chamber 61. The water is cooled down to prevent the temperature of the steel belt 5 and other structures from getting too high.

[0048] The top of the partition 9 has an upward-facing support groove, and the bottom of the support groove has several first channels connecting the support groove to the water inlet chamber 95. The lower end of the support plate 8 is located inside the support groove, and the top of the support groove is higher than the top of the partition 9. The support plate 8 has several second channels, which correspond one-to-one with the first channels. The aligned first and second channels form a drainage channel. The upper end of the second channel has a groove 81, so the cross-sectional area of ​​the upper end of the second channel is larger than the cross-sectional area of ​​the lower end. A throttling bolt 82 is threaded into the drainage channel. The lower end of the throttling bolt 82 is connected to the water inlet chamber 95, and the head of the throttling bolt 82 is located inside the groove 81 and is lower than the top of the support plate 8.

[0049] Sealing assemblies are provided on both the left and right sides of the support groove. Each sealing assembly includes a first sealing strip 93 and a second sealing strip 94, both made of rubber. Taking the left sealing strip as an example, the top of the partition 9 is provided with a limiting groove and a sealing groove, and a first spring 97 and a second spring are respectively provided in the limiting groove and the sealing groove. The lower end of the first sealing strip 93 is located in the limiting groove and slides in cooperation with it. The first spring 97 abuts against the first sealing strip 93, making the top of the first sealing strip 93 higher than the partition 9. The second sealing strip 94 and the sealing groove are both located to the left of the first sealing strip 93. The lower end of the second sealing strip 94 is located in the sealing groove and slides in cooperation with it. The second spring abuts against the second sealing strip 94, making the top of the second sealing strip 94 higher than the top of the partition 9. In this embodiment, the second spring is shorter than the first spring 97, and the height of the second sealing strip 94 is greater than the height of the first sealing strip 93. This results in the second sealing strip 94 sliding a smaller distance downward under the pressure of the steel strip 5, increasing the pressure between it and the steel strip 5, and improving the sealing effect.

[0050] Gaps are provided around the perimeter of the partition 9 and the side walls of the water tank 6 to allow excess water to enter the return water chamber 61. For example... Figure 3 As shown, air knives are provided above and below the support groove. Specifically, the top of the partition 9 has a strip-shaped air knife nozzle 91, which is connected to a high-pressure air pump. High-pressure gas is introduced into the air knife nozzle 91 through the high-pressure air pump, forming a high-pressure airflow that blows towards the steel belt 5. The high-pressure airflow forms an air curtain, preventing water from flowing out from the upper and lower sides of the steel belt 5. The top of the support plate 8 has several water return ports 92, and the partition 9 has a water return channel that runs vertically through the partition 9. The water return ports 92 are connected to the water return channel, allowing water on the support plate 8 to flow into the water return chamber 61 for collection.

[0051] The two adjustment units are located on the front and rear sides of the driven wheel 52, respectively. Each adjustment unit includes a connecting rod 3, a pushing component 2, a fixed base 1, a swing base 4, and a sensor 11. The connecting rod 3 is connected to the rotating shafts at the front and rear ends of the driven wheel 52 via a coupling. In actual implementation, the rotating shafts connected on the driven wheel 52 can also be used as the connecting rod 3.

[0052] In this embodiment, the two swing seats 4 are bearing seats, and a bearing is provided between the connecting rod 3 and the swing seat 4. Specifically, in this embodiment, the connecting rod 3 on the rear side and the swing seat 4 on the rear side are ball bearings, and the connecting rod 3 on the front side and the swing seat 4 on the front side are cylindrical roller bearings. In this embodiment, the rear pusher 2 is referred to as the first pusher 2, and the front pusher 2 is referred to as the second pusher 2. Both the first pusher 2 and the second pusher 2 are hydraulic cylinders. Taking the second pusher 2 as an example, the left end of the second pusher 2 is hinged to the fixed seat 1. The lower end of the swing seat 4 is ball-hinged to the fixed seat 1, and the upper end is integrally formed with a protrusion 41; the push rod of the second pusher 2 faces to the right and is ball-hinged to the protrusion 41. It is equipped with a servo valve with two outlets, namely outlet A and outlet B. The rodless chamber of the first pusher 2 and the rod chamber of the second pusher 2 are simultaneously connected to outlet A, and the rod chamber of the first pusher 2 and the rodless chamber of the second pusher 2 are simultaneously connected to outlet B. In this embodiment, the servo valve is also connected to an overflow valve.

[0053] Two sensors 11 are located on the front and rear sides of the steel strip 5, respectively. Specifically, in this embodiment, the sensors 11 are pressure sensors 11. Taking the front pressure sensor 11 as an example, the pressure sensor 11 is located below the front end of the steel strip 5, and the measuring head of the pressure sensor 11 abuts against the bottom of the steel strip 5. In this embodiment, the pressure sensor 11 is electrically connected to a controller, which is electrically connected to a servo valve. When the front pressure sensor 11 does not detect pressure, it sends an electrical signal to the controller, which then sends an electrical signal to the two pushers 2, controlling the push rod of the rear pusher 2 to extend. The push rod of the front pusher 2 retracts. In actual implementation, the sensors 11 can also be distance sensors 11, position sensors 11, etc., as long as they can detect the position of the steel strip 5.

[0054] The specific implementation process is as follows:

[0055] During testing, the car's four tires are placed on four steel belts 5. When the car starts moving, the drive wheel 51 is rotated by a power component, causing the steel belts 5 to move synchronously. The car's tires do not move forward relative to the ground. At the same time, a water pump introduces high-pressure water into the inlet chamber 95. The high-pressure water is sprayed upwards through the throttling bolt 82 onto the bottom surface of the upper part of the steel belts 5, creating a static pressure support force on the steel belts 5. Because the steel belts 5 move relative to the support base, this movement causes the water entering the support groove from the drainage channel to move forward. When the water reaches the side wall of the support groove, it collides with the side wall, and at this point, some of the water cannot continue to move forward. This portion of water creates a dynamic pressure effect on the steel belts 5, improving the support effect. The combination of static pressure support force and dynamic pressure effect allows the steel belts 5 to withstand large loads without bending.

[0056] Most of the water located between the support plate 8 and the steel strip 5 enters the return water chamber 61 through the return water inlet 92 and is stored there. A very small amount of water moves with the steel strip 5 to the position opposite the partition 9 and drips down onto the partition 9. Finally, it flows into the return water chamber 61 through the gap between the partition 9 and the water tank 6 and is stored there. During the testing process, the water pump continuously pumps water from the return water chamber 61 into the inlet water chamber 95 for water recycling. During this testing process, the high-pressure gas flowing out from the air knife outlet 91 forms an air knife to prevent water from leaking from both sides of the steel strip 5.

[0057] When the car simulates steering, the rotating component 71 drives the base 72 to rotate in the same direction and angle as the tire, so that the length extension direction of the steel belt 5 is the same as the shape direction of the tire, thus preventing the car from falling off the steel belt 5.

[0058] During the detection process, sensor 11 detects the position of steel strip 5. Taking the backward displacement of steel strip 5 as an example, the pressure detected by the front sensor 11 is 0. The front sensor 11 sends an electrical signal to the controller, and the controller sends an electrical signal to the servo valve, controlling the extension of the push rod of the first pusher 2 and the retraction of the push rod of the second pusher 2, causing the two fixed seats 1 to deflect. Figure 5 As shown, the driven wheel 52 is deflected. Specifically, in this embodiment, the deflection angle of the driven wheel 52 is controlled to be less than or equal to 1°, so that the steel belt 5 is reset forward. When the pressure sensor 11 on the front side detects pressure, it sends an electrical signal to the controller again, and finally controls the push rods of the first pusher 2 and the second pusher 2 to reset, and the driven wheel 52 is reset.

[0059] When correcting the steel belt 5, the first and second pushers 2 simultaneously drive the driven wheel 52 to swing, which increases the preload on the steel belt 5 at one end of the driven wheel 52 and decreases the preload on the steel belt 5 at the other end. This keeps the preload on the steel belt 5 constant or changes only slightly, ensuring that the steel belt 5 is tensioned while preventing it from being overstretched, thereby extending the service life of the steel belt 5 and further improving the reliability of the steel belt 5 operation.

[0060] In this embodiment, during the operation of the power components, when a three-phase alternating current is applied to the stator 5114, a rotating magnetic field will be generated in the air gap. When a direct current is applied to the outer rotor 511, a constant magnetic field will be generated. The magnetic field of the outer rotor 511 rotates synchronously with the rotating magnetic field of the stator 5114 due to the magnetic pull of the stator 5114. Heat is generated when the motor is running. In this embodiment, cooling water is introduced into the stator 5114 through the inlet 96 of the cooling water channel 512 to cool the stator 5114 and ensure the stable operation of the stator 5114. The outer rotor support part 513 and the stator support part 514 support the outer rotor 511 and the stator 5114 respectively to ensure the stability of the motor operation. A braking structure is provided. When braking, the brake 518 brakes the brake pads 517, and then brakes the rotation of the outer rotor 511 through the flange 519. The rotational speed of the outer rotor 511 can be measured with high precision.

[0061] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A wheel-coupled dynamometer system, characterized in that: The device includes multiple dynamometers, each comprising a support base and a transmission unit. The transmission unit includes a steel belt, a drive pulley, a driven pulley, and a power component. The steel belt is tensioned on the drive pulley and the driven pulley, and the power component drives the steel belt to move. The support base is located between the drive pulley and the driven pulley and below the top of the steel belt. The support base has a water inlet chamber, and its top has several support grooves. The bottom of each support groove has a drainage channel connecting the water inlet chamber and the support groove. The side wall of the support base has a water inlet communicating with the water inlet chamber, and the side wall of each support groove has a water return outlet. Adjustment units are provided on both the front and rear sides of the driven wheel. Each adjustment unit includes a connecting rod, a pushing member, a fixed seat, and a swing seat. The swing seat is ball-hinged with the fixed seat. The pushing member is ball-connected with the fixed seat and is used to push the fixed seat to swing. The connection position of the swing seat and the fixed seat is offset from the pushing direction of the pushing member. The two connecting rods are rotatably connected to the two swing seats respectively. The two adjustment units are respectively a first pusher and a second pusher, and are equipped with at least one servo valve. The servo valve has two outlets. The rod chamber of the first pusher and the rodless chamber of the second pusher are simultaneously connected to one outlet of the servo valve; the rodless chamber of the first pusher and the rod chamber of the second pusher are also connected to the other outlet of the servo valve. The adjustment unit also includes a sensor electrically connected to the pusher, the sensor being used to detect the position of the steel strip.

2. The wheel coupling dynamometer system according to claim 1, characterized in that: The top of the support base is provided with two sealing groups, which are distributed sequentially along the length of the steel strip and located on both sides of the support groove. Each sealing group includes a first sealing strip, the top of which is higher than the top of the support base.

3. The wheel coupling dynamometer system according to claim 2, characterized in that: The top of the support base is provided with an upward-facing limiting groove. The lower end of the first sealing strip is located in the limiting groove and slides in cooperation with the limiting groove. A first spring is provided in the limiting groove, and the upper end of the first spring abuts against the first sealing strip.

4. The wheel coupling dynamometer system according to claim 3, characterized in that: The top of the support base is also equipped with two sets of air knife nozzles, which are distributed along the width of the steel strip and are located on both sides of the support groove.

5. The wheel coupling dynamometer system according to claim 1, characterized in that: A steering unit is provided below the transmission unit. The steering unit includes a base and a rotating component. The transmission unit is located on the base, and the rotating component is used to drive the base to rotate.

6. The wheel coupling dynamometer system according to claim 1, characterized in that: The power component is an external rotor motor that serves as the driving wheel. It includes an external rotor, a stator, a cooling water circuit, a braking structure, a bearing assembly, an external rotor support for supporting the external rotor, and a stator support for supporting the stator. The external rotor is fitted onto the outside of the stator and is rotatably connected to the stator. The external rotor includes a rotor section and a fixed section. The external rotor support is rotatably connected to the fixed section via a bearing assembly. Both ends of the stator are rotatably connected to the external rotor. The stator is supplied with a three-phase AC power supply, and the external rotor is supplied with a DC power supply. The cooling water circuit extends into the stator and is connected to an external water pipe to cool the stator. The vehicle structure includes brake pads and a brake system. A flange is fixed to the end of the fixed section, and the flange is fixedly connected to the brake pads. The brake system can brake the brake disc.

7. The wheel coupling dynamometer system according to claim 1, characterized in that: One of the connecting rods is equipped with a cylindrical roller bearing between itself and the swing seat.

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