Static tire friction testing apparatus

Abstract

The application relates to the field of tire testing, in particular to a static tire friction testing device. The device comprises a pressure applying device, a tension device and a workbench, the pressure applying device is fixedly arranged on the top of the workbench, and the tension device is fixedly arranged on one side of the workbench; the pressure applying device comprises a supporting part, a clamping part, a driving part and a testing part, the driving part is arranged on the top of the supporting part, the testing part is arranged on the bottom of the supporting part, the clamping part is arranged on the inner middle part of the supporting part, and the driving part is drivingly connected to the clamping part; the tension device comprises a tension assembly and a connecting rod, the tension assembly is arranged on one side of the supporting part, one end of the connecting rod is slidingly connected to the tension assembly, and the other end of the connecting rod is fixedly connected to one end of the testing part. First, the tire is fixed on the clamping part, then the tire is pressurized through the driving part, the tire is detected on the testing part by cooperating with the tension device, and the static friction coefficient and the dynamic friction coefficient of the tire are obtained, so that the antiskid performance of the tire is detected.

Description

Technical Field

[0001] This invention relates to the field of tire testing, and more particularly to a static tire friction testing device. Background Technology

[0002] Vehicle tires are an important component of a car. Most car tires are made of rubber and are typically used for 5 to 6 years. With prolonged use, tires will age and wear down, making them very prone to blowouts and tread wear. Therefore, it is necessary to replace car tires regularly.

[0003] With the continuous development of high-performance motorcycle tires, the market is placing increasingly higher demands on the stability of tires during operation. Evaluating the static friction of tires can effectively assess their dynamic stability. To meet market demands and improve the competitiveness of the company's motorcycle tires, it is necessary to test and improve the static friction of motorcycle tires. However, there is currently no such complete testing equipment on the domestic market, and the overall price of imported complete equipment is relatively expensive. Therefore, it is necessary to develop a testing device that meets the basic research needs. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the purpose of this invention is to provide a static tire friction testing device. First, the tire is fixed on the clamping part, and then the pressure on the tire is increased by the driving part. With the cooperation of the tensioning device, the tire is made to perform relevant tests on the testing part, thereby obtaining the static friction coefficient and dynamic friction coefficient of the tire to test the anti-skid performance of the tire.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A static tire friction testing device, the device comprising:

[0007] A pressure-applying device; the pressure-applying device includes a support part, a clamping part, a driving part, and a detection part. The driving part is fixedly disposed on the top of the support part, the detection part is fixedly disposed on the bottom of the support part, the clamping part is disposed on the inner middle of the support part, and the driving part is throttle connected to the clamping part.

[0008] A tension device; the tension device includes a tension component and a connecting rod, the tension component is disposed on one side of the support part, one end of the connecting rod is slidably connected to the tension component, and the other end of the connecting rod is fixedly connected to one end of the detection part;

[0009] The tooling table, wherein the pressure device is fixedly installed on the top of the tooling table and the tension device is fixedly installed on one side of the tooling table;

[0010] The support includes a vertical rod and a horizontal plate. The vertical rod is fixed vertically to the top surface of the tooling table, and the horizontal plate is fixed horizontally to the end of the vertical rod away from the tooling table. The vertical rod is provided in two sets and is respectively set at two ends on one side of the horizontal plate.

[0011] The drive unit includes a cylinder and a push rod. The cylinder is fixedly connected to the top of the horizontal plate. The push rod is partially disposed inside the cylinder and slidably connected to the cylinder. The portion of the push rod protruding from the cylinder passes through the horizontal plate. The clamping part is fixedly connected to the end of the push rod away from the cylinder.

[0012] The clamping part includes a fixing component and a tire mounting component. The fixing component is disposed between two vertical rods and fixedly connected to a push rod, while the tire mounting component is mounted on the fixing component. The fixing component includes two vertical plates and a connecting plate for connecting the two vertical plates. The push rod is fixedly connected to the middle of one side of the connecting plate, while the two vertical plates are respectively disposed at two ends on the other side of the connecting plate. The vertical plate has a fixing groove on the end away from the connecting plate. The opening direction of the fixing groove is the same as the setting direction of the connecting rod and is located on one side of the support part. The tire mounting component has two sets and is disposed in two fixing grooves respectively. The tire mounting component includes a clamping rod and an abutment plate. The clamping rod is inserted into the fixing groove and fixed with a lock nut. The abutment plate is fixedly connected to one end of the clamping rod, and a gap for fixing the tire is provided between the two abutment plates.

[0013] The detection unit includes a push-pull plate that is slidably connected to the top of the tooling table. The push-pull plate is located below the two tire assembly components, and one end of the push-pull plate is fixedly connected to the connecting rod. A baffle is provided on the other end of the push-pull plate.

[0014] Preferably, the vertical plate includes a vertical portion located inside the support and a horizontal portion perpendicular to the vertical portion, and is in the shape of an "L". The horizontal portion is integrally disposed at the bottom end of the vertical portion and one end of the horizontal portion faces the tension component. The fixing groove is disposed on the horizontal portion and its opening direction is the same as the setting direction of the connecting rod. The horizontal portion is also provided with a fixing hole communicating with the fixing groove.

[0015] Preferably, the vertical rod is provided with a first slide rail on the side facing the vertical plate, and a first slide groove is provided on the side of the vertical plate facing the vertical rod. The clamping part can slide on the vertical rod through the first slide rail and the first slide groove.

[0016] Preferably, one end of the abutment plate is provided with a slot, and one end of the clamping rod is engaged in the slot.

[0017] Preferably, the abutment plate is provided with an axially arranged through hole, and a round rod is provided in the through hole; when the round rod is inserted into the through hole, the two tire assembly assemblies can be connected by the round rod.

[0018] Preferably, the push rod is equipped with a force gauge, which is fixedly installed between the push rod and the connecting plate and abuts against both of them.

[0019] Preferably, the connecting plate has a first fixing plate on the side where the force measuring instrument is mounted for fixing the force measuring instrument; wherein the push rod passes through the first fixing plate and is connected to the force measuring instrument.

[0020] Preferably, the tooling table is provided with a second slide rail, and the push-pull plate is provided with a plurality of fixedly connected sliders. The sliders are provided with second slide grooves, wherein the setting direction of the second slide grooves is perpendicular to the setting direction of the horizontal plate; the sliders are engaged with the second slide rails through the second slide grooves, so that the push-pull plate can slide on the tooling table.

[0021] Preferably, the connecting rod is provided with a second fixing plate for enhancing stability, and the second fixing plate is fixedly connected between the connecting rod and the push-pull plate.

[0022] Preferably, the length of the push-pull plate is 55-65cm and its width is 25-35cm.

[0023] In summary, the advantages of this invention are as follows:

[0024] The principle of this device is to fix the tire on the abutment plate of the clamping part to ensure that the tire does not rotate. A force measuring instrument is installed on the connecting plate of the clamping part to display the radial force. Then, different simulated road surfaces are placed on the testing part, and the driving part applies pressure to make the tire contact the simulated road surface plate. By adjusting the pressure, the required radial force is achieved. Then, the pulling device pulls the simulated road surface plate and records the maximum force value during the test to calculate the static friction coefficient and dynamic friction coefficient of the tire, thereby testing the tire's anti-skid performance. Attached Figure Description

[0025] Figure 1 and Figure 2 This is a schematic diagram of the static tire friction testing device;

[0026] Figure 3 This is a schematic diagram of the clamping part;

[0027] Figure 4 This is a schematic diagram of the detection department.

[0028] Figure 5 For tire test charts;

[0029] Figure 6A graph showing the relationship between tire pressure and grip;

[0030] Figure 7 A graph showing the coefficient of friction;

[0031] Reference numerals: 1. Pressing device; 2. Pulling device; 3. Tooling table; 11. Support part; 12. Clamping part; 13. Driving part; 14. Detection part; 21. Pulling assembly; 22. Connecting rod; 111. Vertical rod; 112. Horizontal plate; 121. Vertical plate; 122. Connecting plate; 123. Fixing groove; 124. Clamping rod; 125. Abutment plate; 131. Cylinder; 132. Push rod; 141. Push-pull plate; 142. Baffle; 151. First slide rail; 152. First slide groove; 153. Slot; 154. Through hole; 155. Round rod; 156. Force gauge; 157. First fixing plate; 158. Second slide rail; 159. Slider; 160. Second slide groove; 161. Second fixing plate. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0034] It should also 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.

[0035] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0036] like Figures 1 to 7As shown, a static tire friction testing device includes a pressure device 1, a tension device 2, and a fixture 3. The pressure device 1 is fixedly mounted on the top of the fixture 3, while the tension device 2 is fixedly mounted on one side of the fixture 3. By fixing the tire to the pressure device 1 and then driving the tension device 2, the tire is changed from a stationary state to a moving state, thereby obtaining the static and dynamic friction coefficients of the tire.

[0037] The pressure application device 1 is further divided into a support part 11, a clamping part 12, a drive part 13, and a detection part 14. The drive part 13 is fixedly installed on the top of the support part 11, the detection part 14 is fixedly installed on the bottom of the support part 11, the clamping part 12 is installed in the middle of the inner side of the support part 11, and the drive part 13 is connected to the clamping part 12.

[0038] The support part 11 is used to support the entire pressure device 1. It includes a vertical rod 111 and a horizontal plate 112. The vertical rod 111 is fixed vertically on the top surface of the tooling table 3, and the horizontal plate 112 is fixed horizontally on the end of the vertical rod 111 away from the tooling table 3. The vertical rod 111 is provided in two sets and is respectively provided on the two ends of one side of the horizontal plate 112.

[0039] The drive unit 13 provides power and pressure to the pressure application device 1. It includes a cylinder 131 and a push rod 132. The cylinder 131 is fixedly connected to the top of the horizontal plate 112. The push rod 132 is partially disposed inside the cylinder 131 and slidably connected to the cylinder 131. The portion of the push rod 132 protruding from the cylinder 131 passes through the horizontal plate 112. The clamping part 12 is fixedly connected to the end of the push rod 132 away from the cylinder 131.

[0040] The mounting section is used to secure the tires. It includes a fixing component and a tire mounting component. The fixing component is located between two vertical rods 111 and is fixedly connected to a push rod 132, while the tire mounting component is mounted on the fixing component. The fixing component includes two vertical plates 121 and a connecting plate 122 for connecting the two vertical plates 121. The push rod 132 is fixedly connected to the middle of one side of the connecting plate 122, while the two vertical plates 121 are respectively located at the two ends on the other side of the connecting plate 122. The vertical plate 121 has a fixing groove 123 on the end away from the connecting plate 122. The opening direction of the fixing groove 123 is the same as the setting direction of the connecting rod 22 and is located on one side of the support part 11. The tire mounting component has two sets and is respectively located in the two fixing grooves 123. The tire mounting component includes a clamping rod 124 and an abutment plate 125. The clamping rod 124 is inserted into the fixing groove 123 and fixed with a locking nut. The abutment plate 125 is fixedly connected to one end of the clamping rod 124, and a gap for fixing the tire is provided between the two abutment plates 125.

[0041] When tire inspection is required, first move the two clamping rods 124 away from the vertical rod 111 to increase the distance between the two tire assemblies, and then fix the tire between the two abutment plates 125. After the tire is fixed, use the handle nut to fix the clamping rods 124, so that the clamping rods 124 are fixed in the current fixing groove 123, ensuring that the tire is stationary.

[0042] The testing unit 14 is used to test the coefficient of friction of the tire. It includes a push-pull plate 141 that is slidably connected to the top of the tooling table 3. The push-pull plate 141 is located below the two tire assembly, and one end of the push-pull plate 141 is fixedly connected to the connecting rod 22. A baffle 142 is provided on the other end of the push-pull plate 141.

[0043] To ensure the accuracy of experimental data, a fixed plate is installed at the top of the fixture 3 and below the tire mounting assembly. The fixed plate is fixedly connected to the fixture 3 with screws, and the push-pull plate 141 is located above the fixed plate. When the equipment performs tire testing, the push-pull plate 141 of the testing unit 14 needs to be moved. Therefore, to facilitate movement, a second slide rail 158 is provided on the fixed plate. Several fixedly connected sliders 159 are provided on the push-pull plate 141. The sliders 159 are provided with second sliding grooves 160, wherein the setting direction of the second sliding grooves 160 is perpendicular to the setting direction of the cross plate 112. The sliders 159 are engaged with the second slide rails 158 through the second sliding grooves 160, so that the push-pull plate 141 can slide on the fixture 3.

[0044] Since this device is used to test the coefficient of friction of a tire, and tires have different coefficients of friction on different road surfaces, different simulated surfaces need to be placed on the push-pull plate 141. When the pulling device 2 is driven, it moves the push-pull plate 141 in the direction set by the pulling device 2 itself. At this time, the tire is in contact with the simulated surface. The baffle 142 is set to prevent the simulated surface from deviating from its original track during movement, which would cause errors in the experiment. The baffle 142 is set to ensure that the simulated surface has sufficient stability on the push-pull plate 141.

[0045] The simulated ground can be related to bricks of other types of roads such as asphalt pavement, cement concrete pavement, granular pavement or block pavement, and the length of the simulated pavement is set to 40-50cm and its width is set to 15-20cm; in order to realistically simulate the current ground, the length of the push-pull plate 141 is set to 55-65cm and its width is set to 25-35cm.

[0046] The side of the simulated ground that contacts the tire can be kept parallel to the tooling table 3, so that the tire can be tested perpendicular to the simulated ground. The simulated ground can also be tilted to the left or right on the side that contacts the tire, so that the tire is not perpendicular to the simulated ground during the test. This setting of the simulated ground can test the friction coefficient of the left and right sides of the tire.

[0047] The tension device 2 is used to simulate the movement of a tire. It includes a tension assembly 21 and a connecting rod 22. The tension assembly 21 is located on one side of the support part 11. One end of the connecting rod 22 is slidably connected to the tension assembly 21, and the other end of the connecting rod 22 is fixedly connected to one end of the detection part 14.

[0048] like Figures 1 to 3 As shown, the vertical plate 121 includes a vertical portion located inside the support portion 11 and a horizontal portion perpendicular to the vertical portion, forming an "L" shape; its horizontal portion is integrally disposed at the bottom end of the vertical portion, and one end of the horizontal portion faces the tension assembly 21. Figure 2 The horizontal portion is located to the right of the vertical plate 121, and the fixing groove 123 is provided on the horizontal portion and its opening direction is the same as the setting direction of the connecting rod 22; wherein, a fixing hole communicating with the fixing groove 123 is also provided on the horizontal portion.

[0049] The vertical plate 121 of the clamping part 12 fixing component is set in this way to make it more convenient to install and remove the tire, and to move the clamping rod 124 well.

[0050] The abutment plate 125 has an axially arranged through hole 154, and a round rod 155 is provided inside the through hole 154. When the round rod 155 is inserted into the through hole 154, the two tire assembly assemblies can be connected through the round rod 155. Furthermore, a slot 153 is provided at one end of the abutment plate 125, and one end of the clamping rod 124 is engaged with the slot 153.

[0051] The round rod 155 is used to fix the tire, and the clamping rod 124 also has corresponding holes. When the tire needs to be installed, first remove the round rod 155 from the through hole 154 of the abutment plate 125, then move the two clamping rods 124 away from the vertical rod 111 to increase the distance between the two tire assemblies. Then fix the tire between the two abutment plates 125. At this time, the round rod 155 is passed through the hole on the clamping rod 124 of one tire assembly, the abutment plate 125 connected to the clamping rod 124, the gap, the clamping rod 124 of the other tire assembly, and the hole on the clamping rod 124 connected to the abutment plate 125 in sequence; this ensures that the tire can rotate while being fixed. After the tire is fixed, use the handle nut to fix the clamping rod 124, so that the clamping rod 124 is fixed in the current fixing groove 123, ensuring that the tire is stationary.

[0052] By providing a first slide rail 151 on the side of the vertical rod 111 facing the vertical plate 121, and a first slide groove 152 on the side of the vertical plate 121 facing the vertical rod 111, the clamping part 12 can slide on the vertical rod 111 via the first slide rail 151 and the first slide groove 152. This ensures that only vertical movement (up and down) is possible, and lateral movement (left and right) is not allowed, thus ensuring the stability of the clamping part 12 fixing assembly and preventing experimental errors during the testing process.

[0053] like Figure 1 and Figure 2 As shown, a force gauge 156 is provided on the push rod 132 of the drive unit 13. The force gauge 156 is fixedly installed between the push rod 132 and the connecting plate 122 and abuts against both of them.

[0054] The force gauge 156 uses a 0.3-grade standard force gauge 156 to display radial force, and an external pressure regulating valve is connected to the force gauge 156. The pressure is adjusted by the pressure regulating valve to achieve the required radial force, so that the accuracy error can be controlled within ±1kg.

[0055] Furthermore, to ensure the stability of the force gauge 156, a first fixing plate 157 for fixing the force gauge 156 is provided on the side of the connecting plate 122 where the force gauge 156 is located. The push rod 132 passes through the first fixing plate 157 and is connected to the force gauge 156 to ensure that the force gauge 156 will not move and to ensure the stability of the force gauge 156.

[0056] Since the entire device simulates the movement of a tire using the tension device 2, relying solely on the connecting rod 22 to connect the push-pull plate 141 of the detection unit 14 could easily lead to the connecting rod 22 separating from the thrust plate during the tension simulation. Therefore, a second fixing plate 161 is provided on the connecting rod 22 to enhance stability. The second fixing plate 161 is fixedly connected between the connecting rod 22 and the push-pull plate 141. The second fixing plate 161 is connected to the connecting rod 22 and the push-pull plate 141 by bolts or snap-fit.

[0057] The principle is as follows: the tire is fixed on the matching connecting plate to ensure that the tire does not rotate. A 0.3-grade standard force gauge 156 is installed on the contact surface of the pressure device 1 to display the radial force. The cylinder 131 applies pressure to make the tire contact different simulated road surface plates. The pressure is adjusted by the pressure regulating valve to achieve the required radial force, with an accuracy controllable within ±1kg. Then, the towing system pulls the simulated road surface plate and records the maximum force value during the test to calculate the static friction coefficient and dynamic friction coefficient of the tire to test the tire's anti-skid performance.

[0058] The principle of this device is to fix the tire on the abutment plate 125 of the clamping part 12 to ensure that the tire does not rotate. A force measuring instrument 156 is installed on the connecting plate 122 of the clamping part 12 to display the radial force. Then, different simulated road surfaces are placed on the detection part 14, and the driving part 13 applies pressure to make the tire contact the simulated road surface. By adjusting the pressure, the required radial force is achieved. Then, the pulling device 2 pulls the simulated road surface panel and records the maximum force value during the test to calculate the static friction coefficient and dynamic friction coefficient of the tire, thereby testing the anti-skid performance of the tire.

[0059] The testing equipment was put into testing in February 2022 and has provided a certain amount of test data to the Tire Research Institute. Through fitting, the reliability of the data is about 98.8%.

[0060] This equipment provides a testing reference for the coefficient of friction of tires or rubber components; it will effectively combine actual road test braking performance with a comparison of the dry and wet grip capabilities of tires, making a significant contribution to the further development of advanced tire products. Furthermore, the evaluation of individual tire profiles, tread patterns, and rubber compounds will facilitate smooth R&D and effectively address real-world tire problems.

[0061] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A static tire friction testing device, characterized in that, The device includes: Pressure application device (1); The pressure application device (1) includes a support part (11), a clamping part (12), a driving part (13) and a detection part (14). The driving part (13) is fixedly disposed on the top of the support part (11), the detection part (14) is fixedly disposed on the bottom of the support part (11), the clamping part (12) is disposed in the middle of the inner side of the support part (11), and the driving part (13) is throttle connected to the clamping part (12). A tension device (2); the tension device (2) includes a tension assembly (21) and a connecting rod (22). The tension assembly (21) is disposed on one side of the support (11). One end of the connecting rod (22) is slidably connected to the tension assembly (21), and the other end of the connecting rod (22) is fixedly connected to one end of the detection part (14). The tooling table (3) is provided, the pressure device (1) is fixedly installed on the top of the tooling table (3), and the tension device (2) is fixedly installed on one side of the tooling table (3). The support part (11) includes a vertical rod (111) and a horizontal plate (112). The vertical rod (111) is vertically fixed on the top surface of the tooling table (3), and the horizontal plate (112) is horizontally fixed on the end of the vertical rod (111) away from the tooling table (3). The vertical rod (111) is provided in two sets and is respectively set on the two ends of one side of the horizontal plate (112). The drive unit (13) includes a cylinder (131) and a push rod (132). The cylinder (131) is fixedly connected to the top of the horizontal plate (112). The push rod (132) is partially disposed inside the cylinder (131) and slidably connected to the cylinder (131). The part of the push rod (132) protruding from the cylinder (131) passes through the horizontal plate (112). The clamping part (12) is fixedly connected to the end of the push rod (132) away from the cylinder (131). A force gauge (156) is provided on the push rod (132). The force gauge (156) is fixedly disposed between the push rod (132) and the connecting plate (122) and abuts against both of them. The clamping part (12) includes a fixing component and a tire mounting component. The fixing component is disposed between two vertical rods (111) and is fixedly connected to the push rod (132), while the tire mounting component is mounted on the fixing component. The fixing component includes two vertical plates (121) and a connecting plate (122) for connecting the two vertical plates (121). The push rod (132) is fixedly connected to the middle of one side of the connecting plate (122), while the two vertical plates (121) are respectively disposed on the two ends of the other side of the connecting plate (122). The vertical plate (121) is located at the end away from the connecting plate (122). A fixing groove (123) is provided, the opening direction of the fixing groove (123) is the same as the setting direction of the connecting rod (22) and is located on one side of the support part (11); the tire mounting assembly is provided in two sets and is respectively set in two fixing grooves (123). The tire mounting assembly includes a clamping rod (124) and an abutment plate (125). The clamping rod (124) is inserted into the fixing groove (123) and fixed with a locking nut. The abutment plate (125) is fixedly connected to one end of the clamping rod (124). A gap for fixing the tire is provided between the two abutment plates (125). The detection unit (14) includes a push-pull plate (141) that is slidably connected to the top of the tooling table (3). The push-pull plate (141) is located below the two tire assembly components. One end of the push-pull plate (141) is fixedly connected to the connecting rod (22), and the other end of the push-pull plate (141) is provided with a baffle (142).

2. The static tire friction testing device according to claim 1, characterized in that, The vertical plate (121) includes a vertical part located inside the support part (11) and a horizontal part perpendicular to the vertical part, and presents an "L" shape; the horizontal part is integrally set at the bottom end of the vertical part and one end of the horizontal part faces the tension component (21); the fixing groove (123) is set on the horizontal part and its opening direction is the same as the setting direction of the connecting rod (22); wherein, a fixing hole communicating with the fixing groove (123) is also provided on the horizontal part.

3. The static tire friction testing device according to claim 2, characterized in that, The vertical rod (111) is provided with a first slide rail (151) on the side facing the vertical plate (121), and a first slide groove (152) is provided on the side of the vertical plate (121) facing the vertical rod (111). Through the first slide rail (151) and the first slide groove (152), the clamping part (12) can slide on the vertical rod (111).

4. The static tire friction testing device according to claim 1, characterized in that, The abutment plate (125) has a slot (153) at one end, and one end of the clamping rod (124) is engaged in the slot (153).

5. A static tire friction testing device according to claim 4, characterized in that, The abutment plate (125) is provided with an axially arranged through hole (154), and a round rod (155) is provided in the through hole (154); when the round rod (155) is inserted into the through hole (154), the two tire assembly assemblies can be connected through the round rod (155).

6. A static tire friction testing device according to claim 1, characterized in that, The connecting plate (122) has a first fixing plate (157) for fixing the force measuring instrument (156) on the side where the force measuring instrument (156) is set; wherein the push rod (132) passes through the first fixing plate (157) and is connected to the force measuring instrument (156).

7. A static tire friction testing device according to claim 1, characterized in that, The tooling table (3) is provided with a second slide rail (158), and the push-pull plate (141) is provided with a number of fixedly connected sliders (159). The sliders (159) are provided with a second slide groove (160), wherein the setting direction of the second slide groove (160) is perpendicular to the setting direction of the horizontal plate (112). The sliders (159) are engaged with the second slide rail (158) through the second slide groove (160), so that the push-pull plate (141) can slide on the tooling table (3).

8. A static tire friction testing device according to claim 1, characterized in that, The connecting rod (22) is provided with a second fixing plate (161) for enhancing stability. The second fixing plate (161) is fixedly connected between the connecting rod (22) and the push-pull plate (141).

9. A static tire friction testing device according to claim 1, characterized in that, The length of the push-pull plate (141) is 55-65cm and its width is 25-35cm.

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