Full-size tire friction performance test bench and test method

Abstract

The invention relates to a full-size tire friction performance test bench and a test method.The test bench comprises a fixed end and a swing end which are installed on the two sides of a rack, and the fixed end transmits rotating motion to a tested tire through a main shaft driving assembly, a rotating speed sensor, a main shaft, a fixed end coupler, a fixed end clamp and a ball cage type universal joint which are sequentially connected; the tested tire is rubbed relative to the friction table; and the swing end enables the rotating shaft connected with the other side of the tested tire and the main shaft to generate a preset angle through the swing driving assembly, so that the test bench can test the friction characteristic of the tested tire under any swing angle position condition. Compared with the prior art, the device has the advantages of simplicity, reliability, capability of carrying out tire friction tests of various sizes under various working conditions and the like.

Description

Technical Field

[0001] The invention relates to the field of automobile tire performance testing, in particular to a full-size tire friction performance testing bench and a testing method. Background Art

[0002] In the field of modern transportation, tires are key components that connect vehicles to the ground, and their friction performance has a vital impact on vehicle safety, handling, and comfort. Whether it is a car, airplane, engineering vehicle, or other transportation that relies on tires, it is necessary to accurately understand the friction characteristics of tires under different working conditions.

[0003] With the continuous development of tire manufacturing technology, the structure and size of tires are showing a trend of diversification. Vehicles for different purposes are equipped with a variety of tires, including but not limited to tires with different pattern designs, different carcass structures, and different sizes and specifications. For example, high-performance car tires often have complex patterns and special carcass materials in order to pursue better grip and handling performance; while tires for engineering vehicles need to have stronger load-bearing capacity and wear resistance, and their size and structure are very different from ordinary car tires.

[0004] In the process of tire development, testing its friction performance is an indispensable link. Traditional tire friction performance test benches have many limitations, one of the key issues is their poor versatility. Many existing test benches are often designed for tires of specific sizes or structures, and cannot effectively test new structures or tires of different sizes. This results in the need for multiple different types of test benches to meet the testing needs of different tires during the tire development process, which not only increases research and development costs, but also reduces testing efficiency. Moreover, there may be certain differences in the data between different test benches, making it difficult to conduct unified comparison and analysis, which brings difficulties to the accurate evaluation of tire performance.

[0005] In addition, in actual applications, the driving conditions of vehicles are complex and diverse, including different road conditions (such as dry, wet, ice and snow, etc.), driving speed, load and other factors. Some existing test benches may not be able to fully simulate these complex conditions, or cannot accurately obtain the friction performance data of tires during the simulation process. This causes the performance of tires in actual use to deviate from the laboratory test results, affecting the overall performance and safety of the vehicle.

[0006] In summary, in order to meet the needs of modern tire research and development and quality control, there is an urgent need for a full-size tire friction performance test bench that can adapt to tires of different structures and sizes and can accurately simulate a variety of complex working conditions. Summary of the invention

[0007] The purpose of the present invention is to provide a full-size tire friction performance test bench and test method in order to overcome the defects of the above-mentioned prior art. The test bench and test method are reasonably designed, and their indicators can better reflect the product manufacturing quality. The test process is simple and reliable, and constant velocity universal joint drive shaft assemblies of various structures and sizes can be tested, which fully reflects the processing and assembly quality of the tested workpiece.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] According to one aspect of the present invention, a full-size tire friction performance test bench is provided, which is used to test the friction performance of a tire to be tested, and comprises a frame, a fixed end and a swing end, wherein the fixed end and the swing end are both mounted on the frame, and the ends of the fixed end and the swing end are respectively connected to two ends of the tire to be tested, and a friction table with replaceable friction material is installed under the tire to be tested, and the friction table is fixed on the frame;

[0010] The fixed end includes a spindle drive assembly, a speed sensor, a spindle and a ball cage universal joint which are connected in sequence, and an end of the ball cage universal joint away from the spindle is connected to the tire to be tested;

[0011] The swing end includes a rotating shaft, a linear displacement sensor, a slider, a swing drive assembly and a guide rail. The tire to be tested is connected to the rotating shaft. The rotating shaft and the slider move in the horizontal direction along the guide rail. The linear displacement sensor is used to detect the movement of the rotating shaft and the slider in the horizontal direction. The rotating shaft, the linear displacement sensor, the slider and the guide rail swing in the vertical direction under the drive of the swing drive assembly.

[0012] Furthermore, a synchronous belt transmission mechanism is provided between the spindle drive assembly and the speed sensor, a fixed end rear support seat is provided behind the speed sensor, a connecting shaft is provided in the fixed end rear support seat, one end of the connecting shaft is connected to the input end of the speed sensor, and the synchronous belt transmission mechanism is respectively connected to the connecting shaft and the end protruding shaft of the spindle drive assembly, and is used to drive the connecting shaft to rotate through the spindle drive assembly.

[0013] Furthermore, the fixed end also includes a spindle support seat, the spindle rotates in the spindle support seat, the output end of the speed sensor is connected to one end of the spindle, and the other end of the spindle is connected to a ball cage universal joint.

[0014] Furthermore, the fixed end also includes a fixed end coupling and a fixed end fixture, and the main shaft is connected to the ball cage universal joint through the fixed end coupling and the fixed end fixture in sequence.

[0015] Furthermore, the swing end drive assembly is installed on the frame and the swing axis is perpendicular to the horizontal plane and upward. The protruding end of the swing axis is fixed with a swing table. The guide rail and the slider are both located on the swing table. The guide rail is parallel to the rotating shaft. The slider cooperates with the guide rail and can move horizontally along the guide rail.

[0016] Furthermore, a rotating shaft support seat is provided above the sliding block, and the rotating shaft rotates in the rotating shaft support seat.

[0017] Furthermore, a swing end linear displacement drive assembly is provided at the end of the guide rail and the slider, and the swing end linear displacement drive assembly includes a screw nut mechanism, the screw of the screw nut mechanism is fixedly connected to the guide rail, the nut of the screw nut mechanism is sleeved on the screw and connected to the slider, and the relative movement of the screw and the nut drives the slider to move along the guide rail.

[0018] Furthermore, one end of the linear displacement sensor is connected to the rotating shaft support seat, and the other end is connected to the swing end linear displacement driving component.

[0019] Furthermore, the fixed end also includes a pad and a pad plate, the spindle drive assembly, the speed sensor and the spindle support seat are all fixedly installed on the pad plate, the pad plate is installed on the pad, the number of the pads is multiple and fixedly connected to the frame.

[0020] According to another aspect of the present invention, a test method for a full-size tire friction performance test bench is provided, comprising the following steps:

[0021] Adjust the horizontal position of the fixed end fixture, the horizontal position of the swing end fixture, and the distance between the fixed end and the swing end rotation center, so that the test bench space meets the installation and positioning requirements of the tire design size. Connect and clamp the left and right ends of the tire to the output shaft of the ball cage universal joint at the fixed end and the swing end shaft, respectively, so that the center line of the tire to be tested is coaxial with the center of the main shaft at the fixed end of the test bench and the center of the swing end shaft;

[0022] Set the swing angle or swing angle change conditions and experimental time required for experiment;

[0023] The servo motor in the fixed-end spindle drive assembly is powered, and the speed sensor is rotated through the synchronous belt and the synchronous pulley, so as to drive the spindle to rotate at the set speed. During the rotation, the speed sensor detects the speed of the spindle in real time;

[0024] The displacement data is outputted by the linear displacement sensor, and the timing starts when the output displacement data is stable;

[0025] After reaching the set test time, stop the test, remove the tested tire, and observe or handle the friction condition.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. The test bench in the present invention includes a fixed end and a swing end installed on both sides of the frame. The fixed end transmits the rotational motion to the tire under test through the main shaft drive assembly, the speed sensor, the main shaft, the fixed end coupling, the fixed end fixture and the ball cage universal joint connected in sequence, so that the tire under test rubs against the friction bench; the swing end makes the rotating shaft connected to the other side of the tire under test generate a preset angle with the main shaft through the swing drive assembly, so that the test bench can test the friction characteristics of the tire under test under any swing angle position condition, thereby simulating the tire use scenarios under various working conditions.

[0028] 2. The present invention has the characteristics of one machine with multiple uses and a wide range of applications. By adjusting the screw and nut of the swing end linear displacement drive assembly, the position of the entirety composed of the swing end clamp, the swing end coupling, the rotating shaft, the rotating shaft support seat, the linear displacement sensor and the slider along the axial direction of the rotating shaft can be adjusted to achieve horizontal adjustment of the installation distance on both sides of the tire to be tested, that is, tires of different structures and sizes can be tested.

[0029] 3. The test method of the present invention has no manual testing link, and the adjustment operations of tire rotation and swing angle are all achieved by issuing instructions to the device, avoiding errors that may be caused by human operation, and has the advantages of unified test standards and accurate measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the schematic diagram of the test bench;

[0031] Figure 2 It is a schematic diagram of the fixed end structure;

[0032] Figure 3 It is a schematic diagram of the swing end structure.

[0033] In the figure, 1, frame, 2, pad, 3, spindle drive assembly, 4, speed sensor, 5, spindle, 6, spindle support seat, 7, fixed end coupling, 8, fixed end fixture, 9, ball cage universal joint, 10, tested tire, 11, swing end fixture, 12, swing end coupling, 13, rotating shaft, 14, linear displacement sensor, 15, slider, 16, swing drive assembly, 17, guide rail. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] This embodiment relates to a full-size tire friction performance test bench and test method, such as Figure 1 As shown, the test bench includes a frame and a fixed end and a swing end located on the frame, wherein the frame 1 is the basic supporting part of the entire structure, and the fixed end and the swing end are both installed on the frame 1.

[0036] like Figure 2 As shown, the fixed end includes many important components, including a pad 2, a pad plate, a spindle drive assembly 3, a speed sensor 4, a spindle 5, a spindle support seat 6, a fixed end coupling 7, a fixed end fixture 8, a ball cage universal joint 9, a tire to be tested 10 and a synchronous belt transmission mechanism. The spindle support seat 6 is connected to the pad plate, and a pad 2 is set under the pad plate to support the fixed end and connect the frame. The spindle 5 can make a rotary motion in the spindle support seat 6. The end of the spindle 5 is connected to the fixed end fixture 8, which plays the role of connecting the spindle 5 and the ball cage universal joint 9.

[0037] The synchronous belt transmission mechanism in the fixed end includes a synchronous belt and two synchronous pulleys, one of which is mounted on the end extending shaft of the fixed end spindle drive assembly 3, and the other synchronous pulley is mounted in the shaft extending from the fixed end rear support seat, and the two are connected by a synchronous belt to form a transmission pair, wherein the shaft extending from the fixed end rear support seat can rotate freely in the seat and is connected to the input end of the speed sensor 4, the output end of the speed sensor 4 is connected to one end of the spindle 5, and the other end of the spindle 5 is installed with a fixed end coupling 7 and a fixed end fixture 8, thereby forming a complete spindle rotation transmission chain to achieve normal operation of the entire equipment;

[0038] like Figure 3 As shown, the swing end includes a swing table, a swing end fixture 11, a swing end coupling 12, a rotating shaft 13, a rotating shaft support seat, a linear displacement sensor 14, a swing end lead screw nut, a guide rail 17, a slider 15 and a swing drive assembly 16; wherein: the swing end swing drive assembly 16 is connected to the rotating shaft 13 extending from the rotation center of the swing table, and the rotating shaft 13 is installed in the bearing seat on the large slide table, and is positioned and supported by radial bearings and axial bearings to achieve rotational motion; there are guide rails 17, sliders 15 and linear displacement sensors 14 on the swing table, and the installation axis directions of the three are on the same plane with the axis of the rotation center of the fixed end, and the swing end linear displacement sensor 14 is connected to the swing end linear displacement drive assembly; a rotating shaft support seat is arranged on the upper part of the slider 15, and the rotating shaft 13 performs rotational motion therein and is connected to the swing end coupling 12 and the swing end fixture 11.

[0039] In this embodiment, the fixed end and the swing end are placed at both ends of the frame 1. A table that can replace the friction material and contacts the tire under test is fixed on the frame 1 as a friction table. By replacing the contact material between the friction table and the tire, driving under different road conditions is simulated.

[0040] As a preferred embodiment, the guide rail 17 on the swing table at the swing end and the swing drive assembly 16 on the frame 1 must be parallel in the initial state of installing the workpiece.

[0041] As a preferred embodiment, the axis of the fixed-end speed sensor 4 and the axis of the fixed-end spindle 5 must be parallel.

[0042] As a preferred embodiment, the rotation center of the fixed end and the rotation center of the swing end must be parallel.

[0043] As a preferred embodiment, the rotary shaft 13 on the swing table at the swing end is installed in a bearing seat in the frame, and the rotary shaft is radially and axially positioned and supported by radial bearings and axial bearings in the bearing seat, and only rotates around the center of rotation.

[0044] The working process of the test bench in this embodiment is as follows:

[0045] Adjust the horizontal position of the fixed end fixture 8 and the horizontal position of the swing end fixture 11 as well as the distance between the two rotation centers to meet the installation and positioning requirements of the tire design size; fix the friction table of appropriate size on the frame 1; connect and clamp the left and right ends of the tire 10 to the output shaft of the ball cage universal joint 9 at the fixed end and the rotating shaft 13 at the swing end, so that the center line of the tire 10 to be tested is coaxial with the test bench, the center of the fixed end spindle 5 and the center of the swing end rotating shaft 13, and complete the tire installation of the test bench;

[0046] Input the swing angle to be tested or make the swing angle under the required change conditions on the operation interface, and set the test time;

[0047] When the test button is turned on, the servo motor in the fixed-end spindle drive assembly 3 is powered, and the speed sensor 4 is rotated through the synchronous belt and the synchronous pulley to keep the spindle 5 at the set speed; at this time, the swing drive assembly 16 rotates a certain angle according to the set swing angle or swing angle change condition, so that the tire 10 to be tested rubs against the friction table according to a certain angle or angle change rule;

[0048] Observe the data output by the linear displacement sensor 14, and start timing when the displacement data output by the linear displacement sensor 14 is stable;

[0049] After reaching the set test time, the test is stopped, the tested tire 10 is removed, and the friction condition is observed or handled.

[0050] The present invention can realize the installation and multi-scenario testing of tires of different sizes, including:

[0051] 1. Simulate the tire friction characteristics when the car is driving in a straight line. The test bench is operated with the swing end axis parallel to the fixed end axis, and the speed sensor 4 and the linear displacement sensor 14 are used to record the speed and the tire axial swing trend during the test.

[0052] 2. Simulate the tire friction characteristics when the car is turning. The swing end axis and the fixed end axis are kept at a fixed angle, and the speed sensor 4 and the linear displacement sensor 14 are used to record the speed and the tire axial swing trend during the test.

[0053] 3. Simulate the tire friction characteristics when the car is turning continuously. The angle between the swing end axis and the fixed end axis is made to change continuously, and the speed sensor 4 and the linear displacement sensor 14 are used to record the speed and the axial swing trend of the tire during the test.

[0054] The present invention can achieve the installation of tires of different sizes and widths in the following manner: when it is necessary to test tires of different widths, the axial length of the test part changes, and at this time, the swing end screw nut is rotated to drive the slider 15 to move on the guide rail 17, thereby driving the swing end support seat and the swing end clamp 11 to move left and right; when the diameter of the axle hole of the tire to be tested changes, the corresponding clamp, friction table and rotating shaft can be replaced.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A full-size tire friction performance test bench, used for testing the friction performance of a tire (10) under test, characterized in that: It comprises a frame (1), a fixed end and a swing end, wherein the fixed end and the swing end are both mounted on the frame, the ends of the fixed end and the swing end are respectively connected to two ends of a tire (10) to be tested, a friction table with replaceable friction material is mounted under the tire (10) to be tested, and the friction table is fixed on the frame (1); The fixed end comprises a main shaft drive assembly (3), a rotation speed sensor (4), a main shaft (5) and a ball cage universal joint (9) which are connected in sequence, and an end of the ball cage universal joint (9) away from the main shaft (5) is connected to a tire (10) to be tested; The swing end comprises a rotating shaft (13), a linear displacement sensor (14), a slider (15), a swing driving assembly (16) and a guide rail (17); the tire (10) to be tested is connected to the rotating shaft (13); the rotating shaft (13) and the slider (15) move in a horizontal direction along the guide rail (17); the linear displacement sensor (14) is used to detect the movement of the rotating shaft (13) and the slider (15) in the horizontal direction; and the rotating shaft (13), the linear displacement sensor (14), the slider (15) and the guide rail (17) swing in a vertical direction under the drive of the swing driving assembly (16).

2. A full-size tire friction performance test bench according to claim 1, characterized in that: A synchronous belt transmission mechanism is provided between the spindle drive assembly (3) and the speed sensor (4); a fixed end rear support seat is provided behind the speed sensor (4); a connecting shaft is provided inside the fixed end rear support seat; one end of the connecting shaft is connected to the input end of the speed sensor (4); and the synchronous belt transmission mechanism is respectively connected to the connecting shaft and the end extension shaft of the spindle drive assembly (3) and is used to drive the connecting shaft to rotate through the spindle drive assembly (3).

3. A full-size tire friction performance test bench according to claim 1, characterized in that: The fixed end also includes a spindle support seat (6), the spindle (5) rotates in the spindle support seat (6), the output end of the speed sensor (4) is connected to one end of the spindle (5), and the other end of the spindle (5) is connected to a ball cage universal joint (9).

4. A full-size tire friction performance test bench according to claim 3, characterized in that: The fixed end also includes a fixed end coupling (7) and a fixed end fixture (8), and the main shaft (5) is connected to a ball cage universal joint (9) via the fixed end coupling (7) and the fixed end fixture (8) in sequence.

5. A full-size tire friction performance test bench according to claim 1, characterized in that: The swing end driving assembly (16) is mounted on the frame (1) and the swing axis is perpendicular to the horizontal plane and upwards. A swing table is fixed to the protruding end of the swing axis. The guide rail (17) and the slider (15) are both located on the swing table. The guide rail (17) is parallel to the rotating shaft (13). The slider (15) cooperates with the guide rail (17) and can move horizontally along the guide rail (17).

6. A full-size tire friction performance test bench according to claim 5, characterized in that: A rotating shaft support seat is provided above the sliding block (15), and the rotating shaft (13) rotates in the rotating shaft support seat.

7. A full-size tire friction performance test bench according to claim 6, characterized in that: The ends of the guide rail (17) and the slider (15) are provided with a swing end linear displacement drive assembly, the swing end linear displacement drive assembly comprises a screw nut mechanism, the screw of the screw nut mechanism is fixedly connected to the guide rail (17), the nut of the screw nut mechanism is sleeved on the screw and connected to the slider (15), and the relative movement of the screw and the nut drives the slider (15) to move along the guide rail (17).

8. A full-size tire friction performance test bench according to claim 7, characterized in that: One end of the linear displacement sensor (14) is connected to the rotating shaft support seat, and the other end is connected to the swing end linear displacement driving component.

9. A full-size tire friction performance test bench according to claim 1, characterized in that: The fixed end also includes a cushion block (2) and a cushion plate, the spindle drive assembly (3), the rotation speed sensor (4) and the spindle support seat (6) are all fixedly mounted on the cushion plate, the cushion plate is mounted on the cushion block (2), and the cushion blocks (2) are multiple in number and fixedly connected to the frame (1).

10. A test method for a full-size tire friction performance test bench as claimed in claims 1 to 9, characterized in that: The following steps are involved: Adjust the horizontal position of the fixed end fixture (8), the horizontal position of the swing end fixture (11) and the distance between the fixed end and the swing end rotation center so that the test bench space meets the installation and positioning requirements of the tire design size, and connect and clamp the left and right ends of the tire (10) to the output shaft of the ball cage universal joint (9) at the fixed end and the swing end rotating shaft (13) at the swing end, respectively, so that the center line of the tire (10) to be tested is coaxial with the center of the fixed end main shaft (5) and the center of the swing end rotating shaft (13) of the test bench; Set the swing angle or swing angle change conditions and experimental time required for experiment; The servo motor in the fixed end spindle drive assembly (3) is powered, and the speed sensor (4) is rotated through the synchronous belt and the synchronous pulley, so as to drive the spindle (5) to rotate at a set speed. During the rotation, the speed sensor (4) detects the speed of the spindle (5) in real time; Outputting displacement data through a linear displacement sensor (14), and starting timing when the output displacement data is stable; After reaching the set test time, the test is stopped, the tested tire (10) is removed, and the friction condition is observed or processed.

Images