A device for rapid tire burst test of automobile

Abstract

A device for a quick tire burst test of a whole vehicle comprises a device support 1 and a device support 2. The device support 1 is fastened to a mounting hole of a vehicle frame for a tire burst test by bolts, the device support 2 is connected to the device support 1 by fastening bolts, the other end of the device support 2 is connected to a tire burst tool by a support shaft, the tire burst tool rotates around the support shaft, a tool adjustment hole is arranged on the tire burst tool, a start pin shaft penetrates into the tool adjustment hole through a hole on the device support 2 and is connected to the tire burst tool, a cam assembly is arranged above the start pin shaft, the cam assembly is connected to a speed reduction mechanism, the speed reduction mechanism is arranged on the device support 2, and the speed reduction mechanism is connected to a driving motor; the device of the present invention is compact, easy to install and debug, and can be reused; it has strong versatility and can be applied to simulated bursting of various vehicle tire models; and it can carry out targeted simulated bursting of tires, including bursting positions and bursting time.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile testing equipment, and in particular relates to a device for rapid tire burst testing of a whole automobile. Background Art

[0002] According to statistics from relevant departments, 75% of traffic accidents during high-speed driving are related to tires, of which 45% are caused by tire rupture. The direct economic losses caused are about 200-250 million per year. The Ministry of Transport of China also attaches great importance to this and has successively issued regulations such as JT / T325-2018: Extra-large, large and high-level medium-sized buses should be equipped with tire burst emergency safety devices; JT / T1094-2016 stipulates: Operating buses with a length of ≥9m should be equipped with tire burst emergency safety devices, and display them to the driver through the instrument panel; JT / T1178.1-2018 stipulates: For non-double steering axle trucks with a total mass greater than or equal to 12,000Kg and a maximum speed greater than or equal to 90KM / H, all steering wheels should be equipped with tire burst emergency safety devices and marked in a visible position in the cab; GB7258 - It is stipulated in 2017 that the steering wheels of special school buses, passenger buses with a length of ≥9m without a passenger standing area, and dangerous goods transport trucks with a total mass of ≥3500Kg should be equipped with tire blowout emergency protection devices; since 2017, national regulations on the mandatory installation of "tire blowout emergency safety devices" have been implemented, and the scope of use of tire blowout emergency safety devices has gradually expanded from special vehicles to operating passenger buses and operating trucks, which shows the importance the country attaches to tire blowout emergency safety devices.

[0003] The performance standards of tire blowout emergency safety devices are mainly determined based on the following two criteria: the provisions of Appendix A of the vehicle standard JT / T1178.1-2018 after the installation of the tire blowout emergency safety device, and the unofficial "Performance Requirements and Test Methods for Automobile Tire Blowout Emergency Safety Devices or Systems"; the requirements for tire blowout: the simulation of tire blowout should ensure that the time for the test tire to be deflated from normal tire pressure to completely depressurized state is ≤0.75S; when simulating tire blowout, it should ensure that the test tire has holes or cracks of a certain size on the sidewall: for tires with a cross-sectional width less than or equal to 245mm, the length of the sidewall crack or the diameter should be ≥50mm; for tires with a cross-sectional width greater than 245mm, the length of the sidewall crack or the diameter should be ≥80mm; at the same time, the tire lip should not be torn during the simulation of the blowout.

[0004] The steering performance of a vehicle after a tire burst should meet the following requirements:

[0005] aWhen a tire on one side of the steering axis bursts during straight or curved driving, the vehicle should be able to maintain the predetermined trajectory before the burst by steering the steering wheel. During driving, the increase in the tangential force applied by the driver on the outer edge of the steering wheel should not exceed 50N.

[0006] b. After a tire burst, the vehicle should have a certain steering ability, and the driver should be able to effectively avoid obstacles ahead by manipulating the vehicle's steering wheel at a specified speed. The steering force increment should not exceed 50N, and the steering force should not exceed 245N.

[0007] At present, in order to verify the vehicle performance of the tire emergency safety device, each major test manufacturer needs to simulate the state of the vehicle after a sudden tire blowout. For this purpose, each test site has developed independent tire blasting equipment. The following are the current conventional centralized tire blasting equipment. The equipment for vehicle tire blowout testing is mainly the following three types: 1. Explosive blasting: Install patch explosives on the sidewall of the tire, and use wire control to control the time of explosive blasting to achieve rapid tire deflation and simulate vehicle tire blowout. This tire blasting method has the following shortcomings: 1. The disadvantage of this method is the danger and control of transportation of explosives. Only a few units with blasting qualifications are capable of using it. 2. And for different tire models and brands, there is a disadvantage that explosives cannot control the final blasting effect. In addition, the cost of this blasting method is high, and its safety has always been questioned. 2. Nail board blasting: On the vehicle's driving route, lay a nail board for tire blowout, and use nail puncture to detonate the tire to achieve rapid tire deflation and simulate vehicle tire blowout. This equipment has the following shortcomings: 1. Since the nail plate blasting equipment is laid on the road, after the vehicle is driven on the nail plate at high speed, it will jump due to the height difference and slope product between the nail plate and the road surface, causing the external impact of the tire blowout test on the tire blowout emergency safety device and the test data, resulting in a large deviation in the test data. 2. Since the width of the nail plate blasting equipment is about the width of a tire, when the driver is driving at high speed to detonate the tire, it is difficult to accurately drive on the nail plate or cause the tire to explode at the predetermined position due to the limited vision of the cab. 3. If the blasting device cannot return to its position normally after the front wheel of the vehicle is blasted normally, it may cause the rear wheel tire to explode by mistake, resulting in an increase in the test cost. 3. Quick release blasting type: On the vehicle undergoing the whole vehicle tire blowout test, the tire or rim planned to be blasted is modified, and a gas quick release valve is installed. The opening and closing of the valve is controlled by electronic signals to achieve rapid tire deflation and simulate vehicle tire blowout. This equipment has the following shortcomings: 1. The equipment itself is heavy and is installed on the unilateral rim that needs to be tested. When the vehicle has a flat tire and loses pressure, the heavy weight of the equipment itself increases the lateral force on the flat tire side, which is reflected on the steering wheel in the cab, which increases the driver's control force and is inconsistent with the actual flat tire data. 2. The equipment is long along the axial length of the tire. When the tire has a flat tire and loses pressure, the height of the vehicle body on the flat tire side decreases, and there is a risk that the flat tire equipment will contact the ground; 3. This equipment needs to be equipped with special tires and rims for flat tire testing. It has poor versatility and takes a long time to install and debug, so it is not suitable for batch operations. Summary of the invention

[0008] In order to solve the reliability and accuracy of the whole vehicle test results for tire blowout emergency safety device products, the present invention provides a whole vehicle rapid tire blowout test equipment.

[0009] The technical solution adopted by the present invention is:

[0010] A device for a quick tire burst test of a whole vehicle comprises a first device bracket and a second device bracket. The first device bracket is fastened to a mounting hole of a vehicle frame for a tire burst test by bolts, the second device bracket is connected to the first device bracket by fastening bolts, the other end of the second device bracket is connected to a tire burst tool by a support shaft, the tire burst tool rotates around the support shaft, a tool adjustment hole is provided on the tire burst tool, a starting pin shaft penetrates into the tool adjustment hole through a hole on the second device bracket and is connected to the tire burst tool, a cam assembly is provided above the starting pin shaft, the cam assembly is connected to a reduction mechanism, the reduction mechanism is provided on the second device bracket, and the reduction mechanism is connected to a driving motor.

[0011] The top surface of the start pin shaft is provided with a flat flange, the top of which contacts the cam assembly, and the outer sleeve of the start pin shaft is provided with a return spring, the top of which contacts the lower surface of the flange of the start pin shaft.

[0012] There are at least three tool adjustment holes, which are arranged on the tire blowout tool.

[0013] The support shaft connects the slotted nut 1, the torsion spring, the outer ring of the torsion spring, the equipment bracket 2, the tire blowout tool and the slotted nut 2 from top to bottom. The outer ring of the torsion spring is arranged outside the torsion spring, and the outer ring of the torsion spring is rigidly connected to the equipment bracket 2.

[0014] The slotted nut 1 is equipped with a cotter pin 1, the slotted nut 2 is equipped with a cotter pin 2, one end of the torsion spring is connected to the outer ring of the torsion spring, and the other end is connected to the support shaft.

[0015] The equipment bracket one is a T-shaped integrated structure formed by two plates, the side and the plane, which are perpendicular to each other. Bolt mounting holes are provided on the side and the plane of the equipment bracket one, and the screw mounting holes are all long strip mounting holes; the equipment bracket two is installed on the screw mounting holes on the plane plate of the equipment bracket one by tightening bolts.

[0016] The other end of the equipment bracket 2 is in an arc shape, and the support shaft passes through the lower part of one end of the equipment bracket 2 in the arc shape and is connected with the tire bursting tool.

[0017] The cam assembly and the driving motor are respectively connected to the power output shaft of the reduction mechanism through splines.

[0018] The deceleration mechanism is connected to the control board, and the control board is connected to the signal receiving device.

[0019] The beneficial effects of the present invention are:

[0020] 1. The equipment is small, easy to install and debug, and can be reused;

[0021] 2. It is highly versatile and can be used for simulated explosion of various vehicle tire models;

[0022] 3. The equipment is safe, economical and practical, and does not require special operations;

[0023] 4. It can simulate the explosion of tires in a targeted manner, including the explosion location and explosion time;

[0024] 5. It can be operated remotely to simulate the suddenness of vehicle tire explosion to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a top view of the present invention.

[0027] Figure 3 It is a side view of the present invention.

[0028] Figure 4 for Figure 3 AA section view.

[0029] Figure 5 It is a schematic structural diagram of the starting pin shaft of the present invention.

[0030] Figure 6 It is a side view of the support shaft and the outer ring of the torsion spring of the present invention.

[0031] Figure 7 for Figure 6 BB section view.

[0032] Figure 8 The structure of the present invention is schematically shown Figure 2 .

[0033] Fig. 9 It is a structural schematic diagram of the equipment bracket 1 of the present invention.

[0034] Fig.10 It is a schematic structural diagram of the equipment bracket 2 of the present invention.

[0035] In the figure, 1. tire blowout tool, 2. tool adjustment hole, 3. support shaft, 4. slotted nut one, 5. slotted nut two, 6. torsion spring, 7. cotter pin one, 8. cotter pin two, 9. torsion spring outer ring, 10. drive motor, 11. reduction mechanism, 12. cam assembly, 13. return spring, 14. starting pin shaft, 15. equipment bracket two, 16. equipment bracket one. DETAILED DESCRIPTION

[0036] like Figures 1 to 10 As shown, a device for a quick tire blowout test of a whole vehicle comprises a device bracket 16 and a device bracket 2 15. The device bracket 16 is fastened to the mounting hole of the vehicle frame for the tire blowout test by bolts. The device bracket 2 15 is connected to the device bracket 16 by fastening bolts. The other end of the device bracket 2 15 is connected to the tire blowout tool 1 through a support shaft 3. The tire blowout tool 1 rotates around the support shaft 3. The tire blowout tool 1 is provided with a tool adjustment hole 2. The starting pin shaft 14 penetrates into the tool adjustment hole 2 through the hole position on the device bracket 2 15 and is connected to the tire blowout tool 1. A cam assembly 12 is arranged above the starting pin shaft 14. The cam assembly 12 is connected to a reduction mechanism 11. The reduction mechanism 11 is arranged on the device bracket 2 15, and the reduction mechanism 11 is connected to a drive motor 10.

[0037] The top surface of the start pin 14 is provided with a flat flange, the top of which contacts the cam assembly 12 , and the outer sleeve of the start pin 14 is provided with a return spring 13 , the top of which contacts the lower surface of the flange of the start pin 14 .

[0038] There are at least three tool adjustment holes 2 , which are arranged on the tire blowout tool 1 .

[0039] The support shaft 3 connects the slotted nut 1 4, the torsion spring 6, the torsion spring outer ring 9, the equipment bracket 2 15, the tire blowout tool 1 and the slotted nut 2 15 from top to bottom. The torsion spring outer ring 9 is arranged on the outside of the torsion spring 6, and the torsion spring outer ring 9 is rigidly connected to the equipment bracket 2 15.

[0040] The slotted nut 1 4 is equipped with a cotter pin 1 7 , the slotted nut 2 5 is equipped with a cotter pin 2 8 , one end of the torsion spring 6 is connected to the torsion spring outer ring 9 , and the other end is connected to the support shaft 3 .

[0041] The equipment bracket 16 is a T-shaped integrated structure formed by two plates, the side and the plane, which are perpendicular to each other. Bolt mounting holes are provided on the side and the plane of the equipment bracket 16, and the screw mounting holes are all long strip mounting holes; the equipment bracket 2 15 is installed on the screw mounting holes on the plane plate of the equipment bracket 16 by tightening bolts.

[0042] The other end of the equipment bracket 2 15 is in an arc shape, and the support shaft 3 passes through the lower part of the arc-shaped end of the equipment bracket 2 15 and is connected to the tire bursting tool 1 .

[0043] The cam assembly 12 and the drive motor 10 are respectively connected to the power output shaft of the speed reduction mechanism 11 through splines.

[0044] The deceleration mechanism is connected to a control panel, and a signal receiving device is arranged in the control panel.

[0045] The model of the signal receiving device is LR680R-N receiving chip.

[0046] The model of the control board is STC12C5A60S2 chip.

[0047] The present invention uses a special cutter to cut a fast-moving tire. Since the tire speed of the moving vehicle is high and the air pressure in the tire is high, it is necessary to control the time and position of the cutter cutting the tire, so as to control the pressure release speed of the tire explosion and the size of the hole in the tire.

[0048] This tire blowout design is installed on the vehicle beam of the vehicle that needs to undergo a tire blowout test, and can share the reserved installation holes on the frame, with good installation versatility.

[0049] The equipment bracket 16 is fastened to the mounting hole of the vehicle beam for the tire burst test by bolts. The side bolt mounting hole of the equipment bracket 16 is a long strip mounting hole, which is convenient for the universal mounting hole spacing of the beams of different test vehicles. The equipment bracket 2 15 is installed on the upper surface of the equipment bracket 16. The two brackets, equipment bracket 2 15 and equipment bracket 1 16, are fastened to form a rigid body by fastening bolts. The plane of the equipment bracket 16 is provided with a long strip mounting hole. The horizontal position of the equipment bracket 2 15 relative to the equipment bracket 1 16 can be adjusted through the long strip mounting hole on the plane, that is, the distance between the tire burst tool 1 and the sidewall of the tire to be burst can be adjusted.

[0050] The drive motor 10 is integrated with the control panel and the speed reduction mechanism 11, which greatly reduces the installation space of the equipment and improves the integration of the equipment. The power supply voltage of the drive motor 10 is 12-24V, which can be borrowed from the power supply of the vehicle to be blasted, or it can be self-provided and connected to the positive and negative poles. The high-speed shaft of the drive motor 10 is reduced in speed and torque increased by the designed speed reduction mechanism 11, and the power is output to the cam assembly 12.

[0051] The functions of the control panel 11 are as follows: the rotation speed of the driving motor 10 can be controlled by electrical signals, and the rotation angle of the driving motor 10 can also be controlled to achieve accurate control of the rotation angle and rotation speed of the cam assembly 12; a signal receiving device is provided in the control panel, and instructions can be issued through a remote controller to remotely control the operation of the motor, thereby reducing the risk of test-related personnel participating in the test; the control panel has a built-in transformer, and the power receiving can use the same power supply as the driving motor, thereby reducing the complexity of the wiring harness layout;

[0052] The cam assembly 12 is spline-connected with the drive motor 10 through the power output shaft of the speed reduction mechanism 11. When the cam assembly 12 rotates, it can push the start pin 14 to move up and down along its axis, that is, the rotation rule is changed into up and down movement;

[0053] The return spring 13 contacts the bottom of the flange of the starting pin 14. When the cam assembly 12 rotates to the upper position, the starting pin 14 is pushed upward by the spring force of the return spring 13 itself, thereby canceling the limit constraint of the tire blowout tool 1 relative to the equipment bracket 15; the tire blowout tool 1 can rotate freely around the support shaft 3.

[0054] The support shaft 3 puts the slotted nut 1 4, the torsion spring outer ring 9, the torsion spring 6, the equipment bracket 15, the tire burst tool 1 and the slotted nut 2 5 and other parts together from top to bottom; the torsion spring outer ring 9 is rigidly connected to the equipment bracket 15, which can be welded or other fastening methods; one end of the torsion spring 6 is connected to the torsion spring outer ring 9, and the other end is connected to the support shaft 3, ensuring that after the tire burst tool 1 rotates a certain angle along the support shaft 3, it can be restored to the initial position under the action of the torsion force of the torsion spring 6;

[0055] The slotted nut 1 4 and the slotted nut 2 5 are both equipped with a cotter pin 1 7 and a cotter pin 2 8 to ensure that the support shaft 3 will not move along its axial direction while being able to rotate freely;

[0056] A tool adjustment hole 2 is provided on the tire burst tool 1. The starting pin shaft 14 passes through the hole position on the equipment bracket 15 and penetrates into different tool adjustment holes 2, which can increase or decrease the initial torsional force of the torsion spring 6. If the torsion angle is larger, the torsional force is larger, and the initial speed of the tire burst tool 1 rotating around the support shaft 3 is larger, and the time for the blade of the tire burst tool 1 to cut the tire is shorter, and vice versa.

[0057] When the present invention is used, the device bracket 16 is fixed on the side of the longitudinal beam of the vehicle body for tire blowout test. The vertical surface of the device bracket 16 itself has a long strip installation hole, which can be used for the installation holes of various vehicle beams, and the upper and lower relative positions of the device bracket 16 with respect to the longitudinal beam of the vehicle body can be adjusted;

[0058] The equipment bracket 2 15 can adjust the relative distance of the tool relative to the tire sidewall through the forming hole in the plane direction of the equipment bracket 1 16. The driving motor 10, the control panel, the speed reduction mechanism 11 and the cam assembly 12 are installed on the equipment bracket 2 15. When the motor rotates, the cam assembly 12 is driven to rotate through the speed reduction mechanism 11. After the cam rotates to the lower position, the starting pin 14 is pushed by the return spring 13 and bounces upward, canceling the constraint limit between the tire bursting tool 1 and the equipment bracket 15. The tire bursting tool 1 is driven by the torsion force of the torsion spring 6 and quickly rotates around the support shaft 3. When the blade of the tire bursting tool 1 rotates to the tire sidewall position, the tire sidewall is cut and the tire is scratched. By selecting the use of different tool adjustment holes 2 on the tire bursting tool 1, the rotation angular velocity of the tire bursting tool 1 around the support shaft 3 can be controlled, thereby controlling the time for the tire bursting tool 1 to scratch the tire; by adjusting the distance of the tire bursting tool 1 relative to the tire sidewall, the size of the damaged caliber of the tire scratched by the tire bursting tool 1 can be controlled. Because the tire burst cutter 1 is finally rotated to the relative position of the initial direction under the action of the torsion spring 6, the tire burst cutting action is completed in an instant, ensuring that no repeated cutting and injury actions are caused.

[0059] This device has the following features:

[0060] 1. The equipment is small, easy to install and debug, and can be reused;

[0061] 2. It is highly versatile and can be used for simulated explosion of various vehicle tire models;

[0062] 3. The equipment is safe, economical and practical, and does not require special operations;

[0063] 4. It can simulate the explosion of tires in a targeted manner, including the explosion location and explosion time;

[0064] 5. It can be operated remotely to simulate the suddenness of vehicle tire explosion to the greatest extent;

[0065] Comparative analysis:

[0066] 1. Advantages compared to explosive blasting:

[0067] 1.1 Safer and more operable, no professional special personnel are required to complete the operation;

[0068] 1.2 The cost is more economical, which is 1 / 3 of the cost of traditional explosive blasting;

[0069] 1.3 It can accurately operate the blasting diameter and blasting position of the tire;

[0070] 1.4 This equipment is not affected by the site and test environment.

[0071] 2. Compare with nail board blasting:

[0072] 2.1 Small weight and volume, more convenient to carry and install;

[0073] 2.2 During the burst test operation, the vehicle simulated tire burst test is completed to the maximum extent possible, and the vehicle will not cause test data deviation due to external reasons; (such as the spike plate burst type causing the vehicle tire to jump when rolling at high speed to the spike plate);

[0074] 2.3 This equipment is not affected by the site and test environment.

[0075] 2.4 The driver only needs to concentrate on driving the vehicle without worrying about the vehicle's driving trajectory and route. If the spike plate blasting method is used, the driver must ensure that the tire to be blasted is rolled onto the spike plate, which is restricted by the driver's field of vision and often leads to blasting failure;

[0076] 2.5 If the nail plate blasting type cannot return to its original position, it may cause the accidental blasting of the remaining tires of the vehicle.

[0077] 3. Contrast fast-release blasting

[0078] 3.1 Small mass, small size, more convenient to carry and install, no need to modify the tires or rims, greatly reducing the time of blasting operations.

[0079] 3.2 Small mass, no additional load will be added to the tire that needs to be blown up, and the test data collection is more accurate;

[0080] 3.3 It can achieve the effect of rapid deflation. It is difficult to control the tire pressure release time by quick-release tire bursting;

[0081] In summary, this invention patent can accurately guarantee the tire explosion standard.

Claims

1. A vehicle rapid tire burst test device, characterized in that: The invention comprises a device support 1 (16) and a device support 2 (15), wherein the device support 1 (16) is fastened to a mounting hole of a vehicle frame for a tire burst test by means of bolts, the device support 2 (15) is connected to the device support 1 (16) by means of fastening bolts, the other end of the device support 2 (15) is connected to a tire burst tool (1) by means of a support shaft (3), the tire burst tool (1) rotates around the support shaft (3), a tool adjustment hole (2) is provided on the tire burst tool (1), a start pin shaft (14) is inserted into the tool adjustment hole (2) through a hole on the device support 2 (15) and is connected to the tire burst tool (1), a cam assembly (12) is provided above the start pin shaft (14), the cam assembly (12) is connected to a speed reduction mechanism (11), the speed reduction mechanism (11) is provided on the device support 2 (15), and the speed reduction mechanism (11) is connected to a drive motor (10); the top surface of the start pin shaft (14) is provided with a A flat flange, the top of which contacts the cam assembly (12); a return spring (13) is provided on the outer periphery of the start pin shaft (14); the top of the return spring (13) contacts the lower surface of the flange of the start pin shaft (14); the tool adjustment holes (2) are at least three and are arranged on the tire burst tool (1); the support shaft (3) connects the slotted nut (4), the torsion spring (6), the outer ring of the torsion spring (9), the equipment bracket (15), the tire burst tool (1) and the slotted nut (5) together from top to bottom; the outer ring of the torsion spring (9) is arranged outside the torsion spring (6), and the outer ring of the torsion spring (9) is rigidly connected to the equipment bracket (15); the slotted nut (4) is provided with a cotter pin (7), the slotted nut (5) is provided with a cotter pin (8), one end of the torsion spring (6) is connected to the outer ring of the torsion spring (9), and the other end is connected to the support shaft (3).

2. The vehicle rapid tire burst test equipment according to claim 1, characterized in that: The equipment bracket 1 (16) is a T-shaped integrated structure formed by two plates, the side plate and the plane plate, which are perpendicular to each other. Bolt mounting holes are provided on the side plate and the plane plate of the equipment bracket 1 (16), and the bolt mounting holes are all long strip mounting holes; the equipment bracket 2 (15) is installed on the bolt mounting holes on the plane plate of the equipment bracket 1 (16) by tightening bolts.

3. The vehicle rapid tire burst test equipment according to claim 1, characterized in that: The other end of the second equipment bracket (15) is in an arc shape, and the support shaft (3) passes through the lower part of one end of the second equipment bracket (15) in the arc shape and is connected to the tire bursting tool (1).

4. The vehicle rapid tire burst test equipment according to claim 1, characterized in that: The cam assembly (12) and the drive motor (10) are respectively connected to the power output shaft of the speed reduction mechanism (11) via splines.

5. The vehicle rapid tire burst test equipment according to claim 1, characterized in that: The deceleration mechanism is connected to the control board, and the control board is connected to the signal receiving device.

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