Vehicle tire impact test equipment and evaluation method

Abstract

The invention belongs to the technical field of automobiles, and discloses vehicle tire impact test equipment and an evaluation method. The vehicle tire impact test equipment comprises a mounting base and a bearing table, the mounting base is of a circular structure, a plurality of mounting holes and threaded holes are formed in the top of the mounting base, and the threaded holes are evenly distributed in the circumferential direction of the mounting base; the bearing table is of a circular structure, a plurality of connecting holes aligned with the threaded holes are formed in the top of the bearing table, bolts penetrate through the connecting holes to be in threaded connection with the threaded holes, and an impact beam is fixedly arranged at the top of the bearing table. According to the vehicle tire impact test equipment provided by the invention, the impact angle can be adjusted according to test requirements, the whole vehicle impact test operation is simple, the test vehicle keeps straight driving in the test process, a driver does not need to rotate a steering wheel to find the impact angle in the whole process, and the impact effect is consistent with the actual driving condition; and the reproducibility of a test result is relatively high.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a vehicle tire impact testing device and an evaluation method. Background Art

[0002] Tires are the only parts of the vehicle that come into contact with the ground. They are 3C and mandatory inspection parts in cars. Together with the car suspension, they mitigate the impact of the car while driving, ensuring that the car has good ride comfort and driving smoothness. The safety of tires is related to the safety of the entire vehicle. As the automotive industry develops towards new energy, in order to obtain greater grip and provide high-value styling, the size of wheels is getting larger and larger, the aspect ratio of tires is getting smaller and smaller, and the vertical shock absorption capacity of tires is reduced, resulting in a prominent risk of bulging when the tires of the entire vehicle impact steps during actual driving. In the design, it is important to verify the impact resistance of tires.

[0003] At present, the tire impact test is carried out by driving the whole vehicle directly to impact a fixed cement step. The test process is heavily dependent on the driver's experience. Although the impact effect of this scheme is similar to the actual driving condition, the angle of the cement step is fixed. The test needs to rely on the driver's experience to turn the steering wheel to find the impact angle at different stable test speeds, and the test is relatively random. Summary of the invention

[0004] The object of the present invention is to provide a vehicle tire impact testing device and evaluation method to solve the problems raised in the above background technology.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A vehicle tire impact testing device, comprising:

[0007] A mounting base, wherein the mounting base is in a circular structure, a plurality of mounting holes and threaded holes are provided on the top of the mounting base, and the plurality of threaded holes are evenly distributed along the circumference of the mounting base;

[0008] The bearing platform is of circular structure, a plurality of connection holes aligned with the threaded holes are opened on the top of the bearing platform, bolts pass through the connection holes and are screwed to the threaded holes, and an impact beam is fixedly arranged on the top of the bearing platform.

[0009] Optionally, L-shaped brackets are provided at both ends of the impact beam.

[0010] Optionally, one end of the L-shaped bracket away from the impact beam is bent downward.

[0011] Optionally, both sides of the top of the impact beam are provided with chamfers, and the connection between the chamfers and the end surface of the impact beam is transitioned through a rounded corner.

[0012] Optionally, the mounting base is a disc with a diameter of 1000 mm and a thickness of 15 mm, the mounting base has 24 threaded holes evenly distributed on a circle with a diameter of 880 mm, and the mounting base has 6 mounting holes evenly distributed on a circle with a diameter of 760 mm.

[0013] Optionally, the supporting platform is a disc with a diameter of 1000 mm and a thickness of 15 mm, and the supporting platform has 24 connecting holes evenly distributed on a circle with a diameter of 880 mm.

[0014] Optionally, the length of the impact beam is 1000 mm, the width of the impact beam is 120 mm, and the height of the impact beam is 100 mm.

[0015] A vehicle tire impact evaluation method, comprising:

[0016] Preparation of the test vehicle and vehicle tire impact test equipment before testing;

[0017] After the test vehicle is accelerated to the test speed, it is driven straight along the road at a steady speed, and the test tire of the test vehicle hits the impact beam until the test tire passes the impact beam, the test vehicle decelerates and stops, and the impact is completed;

[0018] Obtaining impact test results of a test tire impacting an impact beam;

[0019] Generate impact evaluation results based on the impact test results.

[0020] Optionally, obtaining an impact test result of a test tire impacting an impact beam includes:

[0021] After the impact is completed, measure the air pressure of the test tire and record it as the first air pressure;

[0022] After a set time has passed after the impact is completed, measure the air pressure of the test tire and record it as the second air pressure;

[0023] The impact test result is obtained according to the first air pressure and the second air pressure.

[0024] Beneficial effects of the present invention:

[0025] The vehicle tire impact test equipment provided by the present invention has an impact angle that can be adjusted according to test requirements. The whole vehicle impact test is simple to operate. During the test, the test vehicle only needs to keep driving in a straight line. During the entire process, the driver does not need to turn the steering wheel to find the impact angle. The impact effect is consistent with the actual driving condition, and the test result is highly reproducible. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0027] Figure 1 It is a structural schematic diagram of a vehicle tire impact testing device provided by the present invention;

[0028] Figure 2 It is a structural schematic diagram of the mounting base in the present invention;

[0029] Figure 3 It is a structural schematic diagram of the carrying platform in the present invention;

[0030] Figure 4 is a cross-sectional view of an impact beam in the present invention;

[0031] Figure 5 It is a schematic diagram of the state setting of the test vehicle and the vehicle tire impact test equipment in the present invention;

[0032] Figure 6 It is a schematic flow chart of the vehicle tire impact evaluation method provided by the present invention.

[0033] In the figure:

[0034] 10. Hardened ground; 11. Round groove;

[0035] 100, mounting base; 110, mounting hole; 120, threaded hole; 200, bearing platform; 210, connecting hole; 211, bolt; 220, impact beam; 221, L-shaped bracket; 222, chamfer; 223, rounded corner. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] like Figures 1 to 5 As shown, the present invention provides a vehicle tire impact test device, including a mounting base 100 and a bearing platform 200. The mounting base 100 is a circular structure, and a plurality of mounting holes 110 and threaded holes 120 are provided on the top of the mounting base 100, and the plurality of threaded holes 120 are evenly distributed along the circumference of the mounting base 100; the bearing platform 200 is a circular structure, and a plurality of connecting holes 210 aligned with the threaded holes 120 are provided on the top of the bearing platform 200, and bolts 211 pass through the connecting holes 210 and are screwed to the threaded holes 120, and an impact beam 220 is fixedly provided on the top of the bearing platform 200. The mounting base 100 is fixedly connected to the hardened ground 10 through the mounting holes 110.

[0042] During the impact test, hold the impact beam 220 and rotate it so that the impact beam 220 drives the supporting platform 200 to rotate. After adjusting the impact beam 220 on the supporting platform 200 to the forward direction of the test vehicle to the required angle, align the connecting hole 210 on the supporting platform 200 with the threaded hole 120 on the mounting base 100, and fix the supporting platform 200 and the mounting base 100 together with bolts 211. The upper surface of the supporting platform 200 after installation needs to be on the same horizontal plane with the hardened ground 10.

[0043] In some embodiments, L-shaped brackets 221 are provided at both ends of the impact beam 220, and the L-shaped brackets 221 are used to carry and move the support platform 200 fixedly connected to the impact beam 220. The end of the L-shaped bracket 221 away from the impact beam 220 is bent downward to prevent the end of the L-shaped bracket 221 from stabbing the test tire. Chamfers 222 are provided on both sides of the top of the impact beam 220, and the connection between the chamfer 222 and the end surface of the impact beam 220 is transitioned through a rounded corner 223.

[0044] Specifically, the materials of the mounting base 100, the bearing platform 200 and the impact beam 220 are all 45# steel, and the surface is treated with rust prevention after being made. The mounting base 100 is a disc with a diameter of 1000mm and a thickness of 15mm. The mounting base 100 has 24 threaded holes 120 evenly distributed on a circle with a diameter of 880mm. The mounting base 100 has 6 mounting holes 110 evenly distributed on a circle with a diameter of 760mm. The specification of the threaded holes 120 can be M16, and the diameter of the mounting holes 110 can be 16mm. The hardened ground 10 is flat, and a circular groove 11 with a diameter of 1000mm and a depth of 30mm is opened in the middle of the hardened ground 10. The bottom of the circular groove 11 can be hardened with cement. The mounting base 100 is placed in the circular groove 11, and 6 expansion screws are passed through the mounting holes 110 to fasten the mounting base 100 to the circular groove 11 to ensure that the mounting base 100 is firm.

[0045] The bearing platform 200 has the same size and thickness as the mounting base 100. The bearing platform 200 is a disc with a diameter of 1000 mm and a thickness of 15 mm. The bearing platform 200 has 24 connection holes 210 evenly distributed on a circle with a diameter of 880 mm. The diameter of the connection holes 210 may be 17 mm. During the impact test, the bolts 211 pass through the connection holes 210 and are threadedly connected to the threaded holes 120, thereby fixing the bearing platform 200 to the mounting base 100. The specification of the bolts 211 may be M16. An impact beam 220 is welded through the center of the top surface of the bearing platform 200. The length of the impact beam 220 is 1000 mm, the width of the impact beam 220 is 120 mm, and the height of the impact beam 220 is 100 mm. For the cross-sectional shape of the impact beam 220, see Figure 4Both sides of the top of the impact beam 220 are provided with chamfers 222 with a height of 25 mm and a length of 30 mm. The chamfers 222 and the end surface of the impact beam 220 are connected by a transition of R15 fillet 223. The bottom of the impact beam 220 is welded to the top surface of the bearing platform 200 and is firmly fixed. L-shaped brackets 221 are welded to the left and right ends of the impact beam 220. The L-shaped bracket 221 is used to transport and move the bearing platform 200. The end of the L-shaped bracket 221 away from the impact beam 220 is bent downward to prevent the end of the L-shaped bracket 221 from stabbing the test tire. The surface of the entire bearing platform 200 is smooth, without burrs, protrusions and other defects that affect the test.

[0046] In the initial state, the impact beam 220 on the supporting platform 200 is set perpendicular to the center line of the road of the hardened ground 10, and the impact angle is 90°. When the impact angle needs to be adjusted, rotate the supporting platform 200 to a suitable angle, for example, if an angle of 45° is required, the supporting platform 200 rotates through the three threaded holes 120 of the mounting base 100, aligning the hole positions of the connecting holes 210 and the threaded holes 120, and retightening the bolts 211 to fix the supporting platform 200 and the mounting base 100 to complete the angle setting. The impact direction is not limited, but it is necessary to ensure that when the test tire contacts the impact beam 220, the outer side of the test tire contacts the impact beam 220 first, so that after the impact, the tire impact point can be immediately observed through the dye adhered to the test tire during the impact. For the state setting of the test vehicle and the vehicle tire impact test equipment during the impact test, refer to . Figure 5 .

[0047] The vehicle tire impact test equipment provided by the present invention has an impact angle that can be adjusted according to test requirements. The whole vehicle impact test is simple to operate. During the test, the test vehicle only needs to keep driving in a straight line. During the entire process, the driver does not need to turn the steering wheel to find the impact angle. The impact effect is consistent with the actual driving condition, and the test result is highly reproducible.

[0048] like Figures 1 to 6 As shown, the present invention also provides a vehicle tire impact evaluation method, comprising the following steps:

[0049] Step S10: preparing the test vehicle and the vehicle tire impact test equipment before testing.

[0050] Specifically, the test vehicle is a complete vehicle in a normal design state. The four tire assemblies must have the same specifications and use new tires that have been pressed and left to stand for more than 24 hours without leakage. According to the requirements of the vehicle pressure label, confirm and adjust the pressure values ​​of the four tires; the front axle is 100% of the maximum load of the vehicle's front wheels, and the rear axle is 85% of the maximum load of the vehicle's rear wheels. Use sandbags to adjust the vehicle load. Adjust the vehicle tire impact test equipment in the forward direction of the test vehicle, rotate the load platform 200, and adjust the impact beam 220 to the required impact angle. It must be ensured that when the test vehicle passes the impact beam 220 unilaterally, the outer side of the test tire contacts the impact beam 220 first, so that after the impact, the bulge, leakage, and damage points of the test tire are on the front of the test tire and can be observed immediately. After the test vehicle is ready, use a dye to evenly apply it on the inclined surface of the impact beam 220 that is about to be impacted, to ensure that after the impact is completed, a clear impact position indication can be left on the test tire, but the impact position indication must not affect the visual inspection of the test tire for damage. The dye can be selected from paint or oil pen.

[0051] Step S20: After the test vehicle is accelerated to the test speed, it is driven straight along the road at a steady speed, and the test tire of the test vehicle hits the impact beam 220 until the test tire passes through the impact beam 220, the test vehicle decelerates and stops, and the impact is completed.

[0052] Specifically, after the test vehicle and the vehicle tire impact test equipment are ready, if the test tire is of a specification of 225 / 45 R18 or above, the test speed starts at 30 km / h, and if the test tire is of other specifications, the test speed starts at 25 km / h. After the test vehicle is accelerated to the test speed in a straight line, the vehicle speed is stabilized and the vehicle is driven in a straight line along the road, and the test tire of the test vehicle hits the impact beam 220 after the angle is adjusted, until the front wheel and the rear wheel on one side of the test vehicle pass through the impact beam 220, the test vehicle decelerates and stops, and the impact is completed.

[0053] Step S30: Obtaining the impact test result of the test tire that impacts the impact beam 220 .

[0054] Specifically, after the impact is completed, the air pressure of the test tire should be measured and recorded immediately, and photos should be taken for record. Measure the air pressure of the test tire again 10 minutes after the impact is completed and record it. According to the obvious impact position indication left by the dye on the test tire, mark the impact position, impact number number and impact speed information on the sidewall of the test tire. Observe the impact position on the test tire, check whether the test tire has bulges, sidewall cord breakage, shoulder or tread cracking, or the air pressure of the test tire 10 minutes after the impact is completed is more than 20% lower than the air pressure of the test tire after the impact. If there are no such conditions after 4 consecutive impacts at the current test speed, the impact test at this test speed passes, and the impact test results are recorded; if there are such conditions after 4 consecutive impacts at the current test speed, the impact test at this test speed fails, and the impact test results are recorded. Continue to increase the test speed by 5km / h, continue to impact 4 times according to the above steps, record the impact test results at the current test speed, and repeat the above steps until the test speed reaches 45km / h. If the test tire has bulges during the impact, stop the test immediately and the test is over. The test speed is 45km / h, and impact tests at speeds above 50km / h are not recommended.

[0055] Taking the test tire with a specification of 225 / 45 R18 or above as an example, the test speed starts from 30 km / h, and the test vehicle is controlled to hit the impact beam 220 four times at test speeds of 30 km / h, 35 km / h, 40 km / h and 45 km / h respectively.

[0056] Based on the above embodiment, step S30 in this embodiment includes: after the impact is completed, measuring the air pressure of the test tire and recording it as the first air pressure; after a set time after the impact is completed, measuring the air pressure of the test tire and recording it as the second air pressure; obtaining the impact test result according to the first air pressure and the second air pressure. The set time can be 10 minutes.

[0057] Step S40: generating an impact evaluation result according to the impact test result.

[0058] Specifically, after the test is completed, the impact resistance of the test tire is evaluated according to the recorded impact test result of the test tire to obtain the impact evaluation result of the test tire.

[0059] The vehicle tire impact evaluation method provided by the present invention is used to confirm the actual impact resistance of the tire during the whole vehicle tire development stage, and is not suitable for tire test certification and performance verification for other purposes. The test road must be a closed road or test field road that complies with safety regulations, and testing on public roads is prohibited; the test road needs to have a flat paved road surface and a sufficiently long straight road to ensure that the test vehicle can accelerate to 60km / h and have sufficient deceleration distance. The width of the test road must be sufficient to ensure safety in the event that the test vehicle deflects in direction after hitting the impact beam 220. During the test, the impact beam 220 can withstand the high-speed collision of the test vehicle without being damaged. The test vehicle must meet normal driving functions. To ensure safety and prevent the airbag from being triggered during a collision, the test vehicle must disconnect the airbag system during the test.

[0060] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can all be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt mature means in the prior art, and the machinery, parts and equipment adopt conventional models in the prior art. The circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A vehicle tire impact testing device, characterized in that: include: A mounting base, wherein the mounting base is in a circular structure, a plurality of mounting holes and threaded holes are provided on the top of the mounting base, and the plurality of threaded holes are evenly distributed along the circumference of the mounting base; The bearing platform is of circular structure, a plurality of connection holes aligned with the threaded holes are opened on the top of the bearing platform, bolts pass through the connection holes and are screwed to the threaded holes, and an impact beam is fixedly arranged on the top of the bearing platform.

2. The vehicle tire impact testing device according to claim 1, characterized in that: Both ends of the impact beam are provided with L-shaped brackets.

3. The vehicle tire impact testing device according to claim 2, characterized in that: One end of the L-shaped bracket away from the impact beam is bent downward.

4. The vehicle tire impact testing device according to claim 1, characterized in that: Chamfers are provided on both sides of the top of the impact beam, and the connection between the chamfers and the end surface of the impact beam is transitioned through a rounded corner.

5. The vehicle tire impact testing device according to claim 1, characterized in that: The mounting base is a disc with a diameter of 1000 mm and a thickness of 15 mm. The mounting base has 24 threaded holes evenly distributed on a circle with a diameter of 880 mm, and the mounting base has 6 mounting holes evenly distributed on a circle with a diameter of 760 mm.

6. The vehicle tire impact testing device according to claim 5, characterized in that: The bearing platform is a disc with a diameter of 1000 mm and a thickness of 15 mm, and the bearing platform has 24 connection holes evenly distributed on a circle with a diameter of 880 mm.

7. The vehicle tire impact testing device according to claim 1, characterized in that: The length of the impact beam is 1000 mm, the width of the impact beam is 120 mm, and the height of the impact beam is 100 mm.

8. A vehicle tire impact evaluation method, characterized in that: include: Preparation of the test vehicle and vehicle tire impact test equipment before testing; After the test vehicle is accelerated to the test speed, it is driven straight along the road at a steady speed, and the test tire of the test vehicle hits the impact beam until the test tire passes the impact beam, the test vehicle decelerates and stops, and the impact is completed; Obtaining impact test results of a test tire impacting an impact beam; Generate impact evaluation results based on the impact test results.

9. The vehicle tire impact evaluation method according to claim 8, characterized in that: Obtain impact test results for a test tire impacting an impact beam, including: After the impact is completed, measure the air pressure of the test tire and record it as the first air pressure; After a set time has passed after the impact is completed, measure the air pressure of the test tire and record it as the second air pressure; The impact test result is obtained according to the first air pressure and the second air pressure.

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