Tire rolling test machine capable of measuring tire dimensions

Abstract

A tire rolling tester capable of measuring tire dimensions comprises a frame, a simulated road surface, a simulated road surface driving mechanism, and a rim for mounting tires; the simulated road surface driving mechanism is mounted on the frame, the simulated road surface is mounted on the simulated road surface driving mechanism, the rim is detachably mounted on the frame, the simulated road surface is located in front of the rim, and the tire rolling tester also comprises a dimension testing device. The present invention fully or partially realizes the dynamic tracking, recording, analysis and description of tire geometric physical quantities such as tire section width and its changes, tire section horizontal axis position changes, tire section horizontal axis position and its changes, tire section horizontal axis inclination angle and its changes, tire dynamic load radius and its changes, and tire circumference and its changes; avoids errors caused by human measurement; ensures the personal safety of test personnel; at the same time, the protective cover can also protect the laser displacement sensor to avoid damage to the laser displacement sensor.

Description

Technical Field

[0001] The present invention relates to a tire rolling test device, and more specifically to a tire rolling test machine which can dynamically track, record, identify and describe the geometric dimensions of the tire when the tire is rolling, including the tire section width and its changes, the changes in the position of the horizontal axis of the tire section, the position of the horizontal axis of the tire section and its changes, the inclination angle of the horizontal axis of the tire section and its changes, the tire dynamic load radius and its changes, and the tire circumference and its changes. Background Art

[0002] Tires are the only parts of aircraft and vehicles that touch the ground. They bear the load of aircraft and vehicles and roll. Tire rolling performance test is an indispensable part of various mechanical properties, fatigue performance and other performance tests of tires, including tire high-speed endurance test, tire rolling resistance test, tire force and torque test, etc. The common point of these tests is that the tire rolls and moves on the road or simulated road surface (referred to as rolling) passively or actively under a certain load. During these tests, the tire section width and its changes, the changes in the position of the horizontal axis of the tire section, the position of the horizontal axis of the tire section and its changes, the inclination angle of the horizontal axis of the tire section and its changes, the tire dynamic load radius and its changes, and the tire circumference and its changes are all important physical quantities that vehicle designers and tire designers pay special attention to.

[0003] The existing testing methods all involve pausing the tire rolling during or after the test, and measuring the above-mentioned geometric physical quantities of the tire manually or semi-manually. This operation method cannot dynamically track, record, distinguish and describe the above-mentioned geometric physical quantities; due to the changes in the tire rolling state and the static thermal environment (the high-speed rotation of the tire itself during the rolling process will form airflow, which objectively helps the tire to dissipate heat and cool down, and once the tire stops rotating, the heat dissipation airflow disappears, the heat dissipation speed slows down, causing the tire to heat up rapidly and the air pressure to expand), it is inevitable to bring about time-related measurement errors. More importantly, the above-mentioned changes in the tire's thermal environment put the tire in an unstable state, and it may explode unexpectedly at any time, threatening the personal safety of the operator.

[0004] Therefore, some well-known laboratories have regulations prohibiting people from approaching the tires being tested during downtime. Relevant international and national standards also have strict regulations on the time for delayed measurement (such as GB / T4502-2016 Passenger Car Tire Performance Indoor Test Method 5.4.2.4). In terms of safety assurance, delayed detection is certainly a method. However, the accuracy of the measured data cannot be guaranteed, and the regularity (the relationship between the change of air pressure and temperature and time after the test) cannot be understood. Whether the operator can record the above tire geometric physical quantities in a timely manner also becomes an important factor in measurement error. Summary of the invention

[0005] The purpose of the present invention is to provide a tire rolling tester that can dynamically track, record, analyze and describe the geometric dimensions of the tire while it is rolling, including or partially including the tire section width and its changes, the changes in the position of the horizontal axis of the tire section, the position of the horizontal axis of the tire section and its changes, the inclination angle of the horizontal axis of the tire section and its changes, the tire dynamic load radius and its changes, and the tire circumference and its changes.

[0006] The technical solutions adopted are as follows:

[0007] A tire rolling tester capable of measuring tire dimensions comprises a frame, a simulated road surface, a simulated road surface driving mechanism, and a rim for mounting the tire; the simulated road surface driving mechanism is mounted on the frame, the simulated road surface is mounted on the simulated road surface driving mechanism, the rim is detachably mounted on the frame, and the simulated road surface is located in front of the rim. The invention is characterized in that the tire rolling tester further comprises a dimension testing device, which is arranged directly behind the rim, the dimension testing device comprises a protective cover, a laser displacement sensor, a signal acquisition and transmission module, and a data analysis system, the protective cover is mounted on the frame, and the protective cover is located behind the rim, and the laser displacement sensor is mounted in the protective cover.

[0008] In a preferred solution, the laser displacement sensor is a two-dimensional laser displacement sensor, and the measurement plane of the two-dimensional laser displacement sensor passes through the tire rotation axis and points vertically to the tire simulated road surface.

[0009] The dimensional test device using a two-dimensional laser displacement sensor can dynamically track, record, analyze and describe the geometric dimensions of the tire, including the tire section width and its changes, the changes in the horizontal axis position of the tire section, the horizontal axis position of the tire section and its changes, the horizontal axis inclination angle of the tire section and its changes, the tire dynamic load radius and its changes, and the tire circumference and its changes. Before the test, the loading mechanism of the test machine presses the tire against a drum or other simulated road surface. When a sufficiently small load is generated, the vertical distance L from the two-dimensional laser displacement sensor to the simulated road surface is measured by the two-dimensional laser displacement sensor. 0 , the coordinates of the outermost points A and B on the left and right sides of the tire (Y a0 ,Z a0 ) and (Y b0 ,Z b0 ), the vertical distance l from the 2D laser displacement sensor to the outer surface of the tire 0 The high-speed endurance rolling test is started, and the vertical distance L from the two-dimensional laser displacement sensor to the simulated road surface is measured by the two-dimensional laser displacement sensor at any time i. i , the coordinates of the outermost points A and B on the left and right sides of the tire (Y ai ,Z ai ) and (Y bi ,Z bi), the vertical distance l from the 2D laser displacement sensor to the outer surface of the tire i Similarly, the tire section width SW at any time can be obtained by the calculation formula of the tire initial section width, tire section horizontal axis height, tire section horizontal axis inclination angle, and tire initial free radius. i , tire section horizontal axis height H 2i , Tire section horizontal axis tilt angle θ 0 , tire dynamic load radius d i At the end of the test, the tire circumference C is obtained by the tire initial circumference calculation formula. T .

[0010] In a more optimal solution, the calculation formula of the tire section width is as follows:

[0011] SW=Y b -Y a

[0012] Where:

[0013] SW: initial section width of the tire, in millimeters (mm);

[0014] Y b : Axial coordinate of the outermost point on the right side of the tire, in millimeters (mm);

[0015] Y a : The axial coordinate of the outermost point on the left side of the tire, in millimeters (mm).

[0016] In a more optimal solution, the calculation formula for the horizontal axis height of the tire section is as follows:

[0017]

[0018] Where:

[0019] H 2 : Height of the horizontal axis of the tire section, i.e., the vertical distance from the tire section to the simulated road surface, in millimeters (mm);

[0020] L: vertical distance from the 2D laser displacement sensor to the simulated road surface, in millimeters (mm);

[0021] Z b : The vertical coordinate of the outermost point on the right side of the tire, in millimeters (mm);

[0022] Z a : The vertical coordinate of the outermost point on the left side of the tire, in millimeters (mm).

[0023] In a more optimal solution, the calculation formula of the tire cross section horizontal axis roll angle is as follows:

[0024]

[0025] Where:

[0026] θ: Tire section horizontal axis roll angle, in degrees (°);

[0027] Y b : Axial coordinate of the outermost point on the right side of the tire, in millimeters (mm);

[0028] Y a : Axial coordinate of the outermost point on the left side of the tire, in millimeters (mm);

[0029] Z b : The vertical coordinate of the outermost point on the right side of the tire, in millimeters (mm);

[0030] Z a : The vertical coordinate of the outermost point on the left side of the tire, in millimeters (mm).

[0031] In a more optimal solution, the calculation formula of the tire free radius or dynamic load radius is as follows:

[0032]

[0033] Where:

[0034] d: tire free radius or dynamic load radius, in millimeters (mm);

[0035] L: vertical distance from the 2D laser displacement sensor to the simulated road surface, in millimeters (mm);

[0036] l: The distance from the 2D laser displacement sensor to the outer surface of the tire, in millimeters (mm).

[0037] A better solution is that the calculation formula of the tire circumference is as follows:

[0038] C T =π(Ll)

[0039] Where:

[0040] C T : Initial circumference of the tire, in millimeters (mm);

[0041] L: vertical distance from the 2D laser displacement sensor to the simulated road surface, in millimeters (mm);

[0042] l: The distance from the 2D laser displacement sensor to the outer surface of the tire, in millimeters (mm).

[0043] In another embodiment, the laser displacement sensor is a one-dimensional laser displacement sensor, and the dimensional testing device also includes a movable positioning seat. The protective cover has a front side wall plate and a bottom panel. The front side wall plate of the protective cover is provided with a through hole. The slidable positioning seat is installed on the top surface of the bottom panel of the protective cover. The one-dimensional laser displacement sensor is installed on the slidable positioning seat and the laser displacement sensor is located in the through hole.

[0044] In a better solution, the one-dimensional laser displacement sensor emits a one-dimensional laser in a measurement direction that passes through the tire rotation axis and points vertically to the tire simulated road surface. A dimensional test device using a one-dimensional laser displacement sensor is used to measure the tire circumference.

[0045] Before the test, the measuring point is moved to the middle of the tire tread as far as possible through the movable positioning seat and avoids the reasonable position of the groove and decorative line. During the test, the loading mechanism of the test machine presses the tire against the drum or other simulated road surface. When a sufficiently small load is generated, the distance l from the one-dimensional laser displacement sensor to the outer surface of the tire is measured and recorded. 0 , the distance d from the tire rotation center to the simulated road surface 0 , and start high-speed endurance and other rolling tests. When it is necessary to measure the tire circumference, the loading mechanism of the test machine is unloaded, and the tire leaves the simulated road surface. Due to inertia, the tire remains in a rolling state for several minutes, and the distance l from the one-dimensional laser displacement sensor to the outer surface of the tire is measured and recorded. 1 , and get its average value

[0046] A better solution is that the calculation formula of the tire circumference is as follows:

[0047]

[0048] Where:

[0049] C T : The circumference of the tire at the time of measurement, in millimeters (mm);

[0050] l 0 : The initial distance from the one-dimensional laser displacement sensor to the outer surface of the tire, in millimeters (mm);

[0051] d 0 : Initial free radius of the tire, in millimeters (mm);

[0052] The distance from the one-dimensional laser displacement sensor to the outer surface of the tire at the moment of measurement, in millimeters (mm).

[0053] Compared with the prior art, the beneficial effects of the present invention are that it fully or partially realizes the dynamic tracking, recording, analysis and description of tire geometric physical quantities such as tire section width and its changes, changes in tire section horizontal axis position, tire section horizontal axis position and its changes, tire section horizontal axis inclination angle and its changes, tire dynamic load radius and its changes, and tire circumference and its changes; avoids errors caused by human measurement; and ensures the personal safety of test personnel. At the same time, the protective cover can also protect the laser displacement sensor to avoid damage to the laser displacement sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0055] Figure 2 yes Figure 1 The reference diagram of the use state of the embodiment 1 is shown;

[0056] Figure 3 yes Figure 1 The schematic diagram of the structure of the tire positioning unit, the tire pressure unit, and the size testing device of the embodiment 1 is shown;

[0057] Figure 4 yes Figure 1 The structural schematic diagram of the size test device of Example 1 is shown;

[0058] Figure 5 yes Figure 4 Structural schematic diagram with the sealing cover removed;

[0059] Figure 6 yes Figure 5 A schematic diagram of the structure with the laser displacement sensor, the slidable positioning seat and the locking member removed;

[0060] Figure 7 yes Figure 1 The schematic diagram of the structure of the laser displacement sensor, the slidable positioning seat and the locking member of the embodiment 1 shown;

[0061] Figure 8 yes Figure 1 A schematic structural diagram of the laser displacement sensor, the slidable positioning seat, and the locking member of Embodiment 1 shown in another angle;

[0062] Fig. 9 yes Figure 1 The circuit principle block diagram of the embodiment 1 is shown;

[0063] Fig.10 Schematic diagram of left and right outermost points A and B of a tire according to Embodiment 2 of the present invention;

[0064] Fig.11 This is a reference diagram of the usage status of Example 2 of the present invention. DETAILED DESCRIPTION

[0065] Example 1

[0066] like Figure 1-9 As shown, the high-speed endurance tester capable of synchronously detecting the circumference of a tire during inspection in this embodiment comprises a frame 1, a rim 2, a drum driving mechanism 3, a dimension testing device 4, and a simulated road surface 5. The simulated road surface driving mechanism 3 is mounted on the frame 1, the simulated road surface 5 is mounted on the simulated road surface driving mechanism 3, the rim 2 is detachably mounted on the frame 1, and the simulated road surface 5 is located in front of the rim 2. In this embodiment, the simulated road surface driving mechanism 3 has a rotating shaft, and the simulated road surface 5 is mounted on one side of the rotating shaft.

[0067] In this embodiment, a tire positioning unit 6 and a tire pressure unit 7 (a cylinder is used in this embodiment) are installed on the frame 1. The tire positioning unit 6 can be installed on the frame 1 so as to move forward and backward along the frame 1. The tire pressure unit 7 is installed on the frame 1 and is located behind the tire positioning unit 6. The tire pressure unit 7 is against the tire positioning unit 6 and applies pressure to the tire positioning unit 6. Since the simulated road surface 5 applies pressure to the front side of the tire during the test, and the tire pressure unit 7 applies pressure to the tire positioning unit 6, the tire positioning unit 6 applies forward pressure to the tire through the rim 2, which can be used to simulate the operation of the tire under different load conditions.

[0068] The size test device 4 includes a protective cover 401, a laser displacement sensor 402, a slidable positioning seat 403, a locking member 404, a signal acquisition and transmission module 405, and a data analysis system 406. The protective cover 401 is installed on the frame 1 and is located behind the rim 2. The protective cover 401 has a front side wall plate 4011, a bottom panel 4012, a top panel 4013, a right side wall plate 4014, and a sealing cover plate 4015. The front side wall plate 4011 of the protective cover 401 is provided with a through hole 40111. The slidable positioning seat 403 is installed on the top surface of the bottom panel 4012 of the protective cover 401. The laser displacement sensor 402, the signal acquisition and transmission module 405, and the data analysis system 406 are installed on the slidable positioning seat 403, and the front end of the laser displacement sensor 402 is located in the through hole 40111. After the tire is installed on the rim 2, the tire rim 2 assembly is installed on the frame 1. The laser displacement sensor 402 is installed behind the tire and is on the same horizontal plane as the rotation center of the simulated road surface 5 and the rotation center of the tire. The laser displacement sensor 402 measures the distance from the laser displacement sensor 402 to the tire, thereby obtaining the average radius of the tire, which is used to convert the circumference of the tire. The use of the size test device 4 can replace the operator's manual detection of temperature and air pressure after the test, avoid the occurrence of safety accidents, greatly improve safety performance, and the measured circumference of the tire is very accurate.

[0069] The top panel 4013, the front side wall panel 4011, and the bottom panel 4012 are connected in sequence (in this embodiment, the top panel 4013, the front side wall panel 4011, and the bottom panel 4012 are made in one piece), and the inner side wall of the right side wall panel 4014 is respectively connected to the top panel 4013, the front side wall panel 4011, and the right end of the bottom panel 4012 to form a receiving cavity with an opening facing the rear, and the sealing cover plate 4015 is installed on the opening of the receiving cavity and seals the receiving cavity. Since the protective cover 401 is installed on the rack 1, the left side of the receiving cavity is the rack 1, the left side of the receiving cavity is blocked by the rack 1, and the opening of the receiving cavity faces the rear.

[0070] The bottom panel 4012 is provided with a guide groove 40121 and a locking groove 40122, and the bottom surface of the slidable positioning seat 403 is provided with a guide piece 4031 and a locking groove 4032, the guide piece 4031 is inserted into the guide groove 40121 and can slide along the guide groove 40121, the locking piece 404 includes a handle 4041 and a screw 4042, the handle 4041 is fixed to the bottom end of the screw 4042, the top end of the screw 4042 passes through the locking groove 40122 of the bottom panel 4012 and is threadedly connected to the locking groove 4032 of the slidable positioning seat 403, so that the slidable positioning seat 403 is tightly locked on the bottom panel 4012.

[0071] A pull rod 4033 is installed on the right side of the slidable positioning seat 403 , and a pull rod hole 40141 is opened on the right side wall plate 4014 of the protective cover 401 . The pull rod 4033 on the right side of the slidable positioning seat 403 extends out of the protective cover 401 from the pull rod hole 40141 .

[0072] The simulated road surface driving mechanism 3 includes a motor and a belt transmission mechanism, and the motor drives the simulated road surface 5 to rotate through the belt transmission mechanism.

[0073] The laser displacement sensor 402 (ie, one-dimensional laser displacement sensor) emits a one-dimensional laser in a measurement direction that passes through the tire rotation axis and is vertically directed toward the tire simulated road surface. In this embodiment, a size test device using a one-dimensional laser displacement sensor is used to measure the tire circumference.

[0074] The high-speed endurance testing machine processes the data measured by the one-dimensional laser displacement sensor through the signal acquisition and transmission module 405 and the data analysis system 406 to obtain the tire circumference (ie, the tire circumference at the time of measurement).

[0075] Combine the following Figure 1-9 Introduce the working process:

[0076] After the size test device 4 is installed, the measuring point is moved to the middle of the tire tread as far as possible and to a reasonable position avoiding the groove and the decorative line by adjusting the slidable positioning seat 403 .

[0077] During the test, the loading mechanism of the testing machine presses the tire against a drum or other simulated road surface. When a sufficiently small load is generated, the distance l from the one-dimensional laser displacement sensor to the outer surface of the tire is measured and recorded. 0 , the distance d from the tire rotation center to the simulated road surface 0 , and start high-speed endurance and other rolling tests. When it is necessary to measure the tire circumference, the loading mechanism of the test machine is unloaded, and the tire leaves the simulated road surface. Due to inertia, the tire remains in a rolling state for several minutes, and the distance l from the one-dimensional laser displacement sensor to the outer surface of the tire is measured and recorded. 1 , and get its average value

[0078] When it is found that the distance between the tread of the tire 8 and the laser displacement sensor 402 is significantly smaller or periodically fluctuates, it is possible that the position of the laser displacement sensor 402 is just aligned with the tread pattern on the tread of the tire 8, and the position of the laser displacement sensor 402 needs to be adjusted. The adjustment process is as follows:

[0079] At this time, the locking piece 404 can be loosened, and the pull rod 4033 can be pulled by hand to force the guide piece 4031 on the bottom surface of the slidable positioning seat 403 to slide along the guide slot 40121, thereby fine-tuning the position of the slidable positioning seat 403, so that the position of the laser displacement sensor 402 changes with the slidable positioning seat 403 and avoids the tread on the tread of the tire 8. Then, tighten the locking piece 404 again. Continue the test. The adjustment of the laser displacement sensor 402 does not require the tire 8 to stop rotating, and the operation is very convenient and quick, and the use effect is very good.

[0080] The calculation formula of the tire circumference is as follows:

[0081]

[0082] Where:

[0083] C T : The circumference of the tire at the time of measurement, in millimeters (mm);

[0084] l 0 : The initial distance from the one-dimensional laser displacement sensor to the outer surface of the tire, in millimeters (mm);

[0085] d 0 : Initial free radius of the tire, in millimeters (mm);

[0086] The distance from the one-dimensional laser displacement sensor to the outer surface of the tire at the moment of measurement, in millimeters (mm).

[0087] Example 2

[0088] like Fig.11 As shown, the high-speed endurance testing machine capable of synchronously detecting the tire circumference during inspection in this embodiment is different from that in Embodiment 1 in that:

[0089] The size testing device 4 does not have a movable positioning seat.

[0090] The laser displacement sensor 402 is a two-dimensional laser displacement sensor, the measurement plane of which passes through the tire rotation axis and points vertically to the tire simulated road surface.

[0091] The dimensional testing device using a two-dimensional laser displacement sensor can dynamically track, record, identify and describe the geometric dimensions of the tire, including the tire section width and its changes, the changes in the position of the horizontal axis of the tire section, the position of the horizontal axis of the tire section and its changes, the inclination angle of the horizontal axis of the tire section and its changes, the tire dynamic load radius and its changes, and the tire circumference and its changes.

[0092] Before the test, the loading mechanism of the test machine presses the tire against a drum or other simulated road surface. When a sufficiently small load is generated, the vertical distance L from the two-dimensional laser displacement sensor to the simulated road surface is measured by a two-dimensional laser displacement sensor. 0 .like Fig.10 As shown, the coordinates of point A and point B on the left and right sides of the tire (Y a0 ,Z a0 ) and (Y b0 ,Z b0 ), the vertical distance l from the 2D laser displacement sensor to the outer surface of the tire 0 The high-speed endurance rolling test is started, and the vertical distance L from the two-dimensional laser displacement sensor to the simulated road surface is measured by the two-dimensional laser displacement sensor at any time i. i , the coordinates of the outermost points A and B on the left and right sides of the tire (Y ai ,Z ai ) and (Y bi ,Z bi ), the vertical distance l from the 2D laser displacement sensor to the outer surface of the tire i Similarly, the tire section width SW at any time can be obtained by the calculation formula of the tire initial section width, tire section horizontal axis height, tire section horizontal axis inclination angle, and tire initial free radius. i , tire section horizontal axis height H 2i , Tire section horizontal axis tilt angle θ 0 , tire dynamic load radius d i At the end of the test, the tire circumference C is obtained by the tire initial circumference calculation formula. T .

[0093] The calculation formula of the tire section width is as follows:

[0094] SW=Y b -Y a

[0095] Where:

[0096] SW: initial section width of the tire, in millimeters (mm);

[0097] Y b : Axial coordinate of the outermost point on the right side of the tire, in millimeters (mm);

[0098] Y a : The axial coordinate of the outermost point on the left side of the tire, in millimeters (mm).

[0099] The calculation formula of the horizontal axis height of the tire section is as follows:

[0100]

[0101] Where:

[0102] H 20 : Height of the horizontal axis of the tire section, i.e., the initial vertical distance from the tire to the simulated road surface, in millimeters (mm);

[0103] L 0 : The initial vertical distance from the two-dimensional laser displacement sensor to the simulated road surface, in millimeters (mm);

[0104] Z b0 : The vertical coordinate of the outermost point on the right side of the tire, in millimeters (mm);

[0105] Z a0 : The vertical coordinate of the outermost point on the left side of the tire, in millimeters (mm).

[0106] The calculation formula of the tire cross section horizontal axis inclination angle is as follows:

[0107]

[0108] Where:

[0109] θ 0 : Tire section horizontal axis roll angle, in degrees (°);

[0110] Y b0 : Axial coordinate of the outermost point on the right side of the tire, in millimeters (mm);

[0111] Y a0 : Axial coordinate of the outermost point on the left side of the tire, in millimeters (mm);

[0112] Z b0: The vertical coordinate of the outermost point on the right side of the tire, in millimeters (mm);

[0113] Z a0 : The vertical coordinate of the outermost point on the left side of the tire, in millimeters (mm).

[0114] The calculation formula of the initial free radius of the tire is as follows:

[0115]

[0116] Where:

[0117] d 0 : Initial free radius of the tire, in millimeters (mm);

[0118] L 0 : The initial vertical distance from the two-dimensional laser displacement sensor to the simulated road surface, in millimeters (mm);

[0119] l 0 : The initial distance from the two-dimensional laser displacement sensor to the outer surface of the tire, in millimeters (mm).

[0120] The calculation formula of the initial circumference of the tire is as follows:

[0121] C T0 =π(L 0 -l 0 )

[0122] Where:

[0123] C T0 : Initial circumference of the tire, in millimeters (mm);

[0124] L 0 : The initial vertical distance from the two-dimensional laser displacement sensor to the simulated road surface, in millimeters (mm);

[0125] l 0 : The initial distance from the two-dimensional laser displacement sensor to the outer surface of the tire, in millimeters (mm).

[0126] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. The technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A tire rolling tester capable of measuring tire dimensions, comprising a frame, a simulated road surface, a simulated road surface driving mechanism, and a rim for mounting the tire; the simulated road surface driving mechanism is mounted on the frame, the simulated road surface is mounted on the simulated road surface driving mechanism, the rim is detachably mounted on the frame, the simulated road surface is located in front of the rim, and is characterized in that: The tire rolling test machine also includes a dimension test device, which is arranged directly behind the rim. The dimension test device includes a protective cover, a laser displacement sensor, a signal acquisition and transmission module, and a data analysis system. The protective cover is installed on the frame and is located behind the rim. The laser displacement sensor is installed in the protective cover. The laser displacement sensor is a one-dimensional laser displacement sensor. The dimension test device also includes a movable positioning seat. The protective cover has a front side wall plate and a bottom panel. The front side wall plate of the protective cover is provided with a through hole. The slidable positioning seat is installed on the top surface of the bottom panel of the protective cover. The one-dimensional laser displacement sensor is installed on the slidable positioning seat and is located in the through hole. The measurement direction of the one-dimensional laser emitted by the one-dimensional laser displacement sensor passes through the tire rotation axis and is vertically pointed to the tire simulated road surface. The calculation formula of the tire circumference is as follows: Where: C T : The circumference of the tire at the time of measurement, in millimeters (mm); l0: initial distance from the one-dimensional laser displacement sensor to the outer surface of the tire, in millimeters (mm); d0: initial free radius of the tire, in millimeters (mm); The distance from the one-dimensional laser displacement sensor to the outer surface of the tire at the moment of measurement, in millimeters (mm).

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