A device for car collision avoidance

Abstract

This invention relates to a device for automobile collision avoidance, belonging to the field of automobile collision avoidance technology. It includes a collision beam and longitudinal beams on both sides of the vehicle. STF dampers are symmetrically connected between the collision beam and the longitudinal beams, with one end of each STF damper connected to a longitudinal beam. The STF damper includes a cylinder, a single-rod piston, a left end cap, a right end cap, an annular one-way valve, a steel plate, an energy-absorbing box, and a shear-thickening fluid. Left and right end caps are respectively provided at both ends of the cylinder. One end of the energy-absorbing box is connected to the right end cap, and the other end is fixed to the steel plate. An annular groove is formed on the inner wall of the cylinder near the steel plate. The annular one-way valve is fitted onto the steel plate and placed within the annular groove of the cylinder, moving along the annular groove and the outer edge of the steel plate. The cylinder is divided into left and right cavities by the annular one-way valve and the steel plate. The piston is placed in the left cavity, and the piston rod extends out of the left end cap and connects to the collision beam. The left and right cavities and the energy-absorbing box are filled with shear-thickening fluid. This invention can buffer and absorb energy under external forces.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts technology, and in particular relates to a device for automotive collision avoidance. Background Technology

[0002] As of the end of March 2022, the number of motor vehicles in China reached 402 million, of which 307 million were cars, accounting for 76.37% of the total number of motor vehicles; there were 487 million motor vehicle drivers, of which 450 million were car drivers. Therefore, car safety devices are particularly important, and it is essential to study energy-absorbing devices on anti-collision beams.

[0003] In the event of a low-speed collision with an oncoming vehicle or obstacle while the vehicle is in normal driving, the front bumper beam needs to ensure that the impact does not damage the headlights and other important components, and minimize repair costs. This requires the bumper beam to have not only sufficient strength and rigidity, but also excellent energy absorption characteristics.

[0004] The front of a car is equipped with a crash beam, which not only serves a decorative function but, more importantly, is a safety device that absorbs and mitigates external impacts, protecting the car body and its occupants. Current car crash beams rely on the collapse of energy-absorbing boxes to absorb energy during collisions. However, they are not very effective at rebounding after low-speed collisions, and their effectiveness is poor in continuous collisions.

[0005] Traditional automotive crash beam damping technology has a fixed stiffness and cannot be adjusted according to the magnitude and direction of the impact force. This may result in the energy-absorbing box's stiffness being unsuitable in certain collision scenarios, failing to provide optimal energy absorption.

[0006] Existing automotive crash beam damping energy absorption devices mostly use energy absorption boxes, which are mostly single-use structures that cannot be reused, increasing costs. Furthermore, they cannot continue to absorb energy and reduce vibration in the event of a secondary collision. Summary of the Invention

[0007] In view of the above technical problems and in order to solve the problems existing in the prior art, the purpose of this invention is to provide a device for automobile collision avoidance. This invention can adaptively play a buffering and energy absorption role according to the magnitude of the external force. The energy absorption device can be reused after a low-speed collision and can continue to dissipate energy and reduce vibration when a secondary collision occurs.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] This invention discloses an STF-based automotive anti-collision device, comprising an anti-collision beam and longitudinal beams on both sides of the vehicle. STF dampers are symmetrically connected between the anti-collision beam and the longitudinal beams on both sides, with the other end of each STF damper connected to a longitudinal beam. Each STF damper includes a cylinder, a single-rod piston, a left end cap, a right end cap, an annular one-way valve, a steel plate, an energy-absorbing box, and a shear-thickening fluid. Left and right end caps are respectively provided at both ends of the cylinder. One end of the energy-absorbing box is connected to the right end cap, and the other end is fixed to the steel plate. An annular groove is formed on the inner wall of the cylinder near the steel plate. The annular one-way valve is fitted onto the steel plate and placed within the annular groove of the cylinder, moving along the annular groove and the outer edge of the steel plate. The cylinder is divided into left and right cavities by the annular one-way valve and the steel plate. The piston is placed in the left cavity, and the piston rod extends out of the left end cap and connects to the anti-collision beam. The left and right cavities and the energy-absorbing box are filled with shear-thickening fluid.

[0010] Furthermore, the annular groove is 4-5 mm longer than the thickness of the steel plate along the length of the cylinder body, and is used for the up-and-down movement of the annular one-way valve.

[0011] Furthermore, the bottom of the annular one-way valve is provided with four springs, and the other end of the springs is connected to a boss provided on the inner wall of the cylinder.

[0012] Furthermore, a sealing ring is provided between the piston rod and the left end cap for sealing.

[0013] Furthermore, the piston rod protruding end is threaded, and the anti-collision beam is provided with a threaded flange that mates with it.

[0014] Furthermore, the energy-absorbing box is a honeycomb energy-absorbing box, which has a honeycomb structure inside the box and is filled with a shear-thickening liquid inside the honeycomb structure.

[0015] Furthermore, the honeycomb structure is formed by aluminum plates spaced apart inside, and the outside is sealed with cuboid aluminum alloy plates, with end plates connected at both ends to form a sealed structure.

[0016] An automobile, including the aforementioned automobile collision avoidance device.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. Compared with existing structures, this invention employs an STF damper, utilizing the shear-thickening properties of a shear-thickening fluid to buffer and absorb energy under external forces. Used in automotive anti-collision structures, the STF damper connects between the anti-collision beam and the longitudinal beam. The energy-absorbing damper is filled with a shear-thickening fluid. During a low-speed collision, the piston movement forces the shear-thickening fluid into the piston's orifice, causing it to undergo shear-thickening, changing from a liquid to a solid-liquid state, with a sharp increase in viscosity. This generates a damping force to absorb the energy generated by the collision, providing better buffering and energy absorption, reducing the impact of the impact, and thus protecting the vehicle and occupants.

[0019] 2. This invention applies a shear thickening liquid damper to a crash beam, which is a passive control method with advantages such as high safety, fast response speed, and strong self-adaptation. Compared with magnetorheological dampers, it does not require external energy consumption, and has a simple structure and is easy to install.

[0020] 3. Since the shear thickening behavior of the shear thickening fluid is reversible, the fluid can return to its original flow state shortly after the external force is removed. Therefore, this invention can play a buffering and energy-absorbing role in continuous collisions.

[0021] 4. The damper of this invention adopts a three-stage energy absorption device, namely shear thickening fluid in the cylinder body, shear thickening fluid on one side of the energy absorption box, and shear thickening fluid in the energy absorption box and its interior. It can effectively absorb energy under low-speed and medium-high-speed collisions, reduce damage from secondary collisions, protect the main structure of the car and protect the safety of the occupants. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure.

[0023] Figure 2 This is a schematic diagram of a shear thickening fluid damper.

[0024] Figure 3 This is a schematic diagram of the combined structure of an annular check valve and a steel plate.

[0025] Figure 4 This is a schematic diagram of a ring-shaped check valve.

[0026] Figure 5 This is a schematic diagram showing the unsealed top and bottom ends of a honeycomb energy-absorbing box structure.

[0027] The components include: 1. Anti-collision beam, 2. Threaded flange, 3. STF damper, 4. Steel plate connector, 5. Longitudinal beam, 6. Piston rod, 7. Left end cap, 8. Left cavity, 9. Cylinder, 10. Annular check valve, 11. Steel plate, 12. Right cavity, 13. Energy absorption box, 14. Right end cap, 15. Shear thickening fluid, 16. Spring. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Example: See Figures 1-5This invention relates to an STF damper for use in automotive anti-collision devices, comprising an anti-collision beam 1 and longitudinal beams 5 on both sides of the vehicle. The STF damper 3 is symmetrically connected between the anti-collision beam 1 and the longitudinal beams 5. The piston rod 6 of the STF damper 3 is connected to a threaded flange 2 on the anti-collision beam 1, and the other end of the STF damper 3 is connected to the longitudinal beams 5. The STF damper includes a cylinder 9, a single-rod piston, a left end cap 7, a right end cap 14, an annular one-way valve 10, a steel plate 11, an energy-absorbing box 13, and a shear thickening fluid (STF). The cylinder 9 has two ends... The left end cover 7 and the right end cover 14 are not set. One end of the energy-absorbing box 13 is connected to the right end cover 14, and the other end is fixed to the steel plate 11. An annular groove is opened on the inner wall of the cylinder 9 near the steel plate. The annular one-way valve 10 is sleeved on the steel plate 11 and placed in the annular groove of the cylinder 9. It moves along the annular groove and the outer edge of the steel plate 11. The cylinder 9 is divided into a left cavity 8 and a right cavity 12 by the annular one-way valve 10 and the steel plate 11. The piston is placed in the left cavity 8. The piston rod 6 extends out of the left end cover 7 and connects to the anti-collision beam 1. The left and right cavities 8 and 12 and the energy-absorbing box are filled with shear thickening liquid 15.

[0030] The length of the annular groove along the cylinder body 9 is greater than any value between 4mm, 5mm, 4.5mm or 4-5mm in thickness of the steel plate, which facilitates the movement of the annular one-way valve 10.

[0031] The annular one-way valve 10 has four springs 16 evenly arranged around its bottom circumference. The other end of each spring 16 is connected to a boss on the inner wall of the cylinder 9, which is used for the annular one-way valve 10 to extend and retract along the steel plate 11.

[0032] A sealing ring is provided between the piston rod 6 and the left end cover 7 to ensure the sealing of the cylinder body 9.

[0033] The piston rod 6 has a threaded end, and the anti-collision beam 1 is provided with a threaded flange 2 that is connected to it; the steel plate connector 4 has 4 through holes for bolting the cylinder right end cover 14 to the longitudinal beam 5.

[0034] Working principle of this invention:

[0035] During a low-speed collision, the piston rod 6 moves from the left end cap 7 towards the steel plate 11. The shear-thickening fluid 15 in the left cavity 8 is squeezed through the annular gap, undergoing shear thickening and absorbing energy. At this time, the piston rod 6 has not reached the steel plate 11, and the internal pressure is insufficient to open the annular check valve 10.

[0036] During a medium-speed collision, the piston rod 6 moves. The shear-thickening fluid 15 in the left cavity 8 is insufficient to absorb all the energy, resulting in higher pressure inside the cylinder 9. The annular check valve 10 opens, and the shear-thickening fluid 15 in the right cavity 12 is squeezed and subjected to shearing action, absorbing energy. At this time, the piston rod 6 has not yet reached the steel plate 11.

[0037] During a high-speed collision, the shear thickening fluid 15 in the left cavity 8 and the right cavity 12 is insufficient to absorb the impact energy. At this time, the piston rod 6 continues to move, pushing the steel plate 11 to move towards the right end cover 14. The honeycomb energy-absorbing box 13 is squeezed and deformed, and the shear thickening fluid filled inside the energy-absorbing box 13 undergoes shear thickening. Both absorb the energy together, reducing damage to the vehicle and ensuring the safety of the occupants.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for automobile collision avoidance, comprising a collision beam and longitudinal beams on both sides of the automobile, characterized in that: STF dampers are symmetrically connected between the anti-collision beam and the longitudinal beams on both sides, and the other end of the STF damper is connected to the longitudinal beam. The STF damper includes a cylinder, a single-rod piston, a left end cover, a right end cover, an annular one-way valve, a steel plate, an energy-absorbing box, and a shear thickening liquid. The cylinder is provided with left and right end covers at both ends. One end of the energy-absorbing box is connected to the right end cover, and the other end is fixed to the steel plate. An annular groove is opened on the inner wall of the cylinder near the steel plate. The annular one-way valve is sleeved on the steel plate and placed in the annular groove of the cylinder. It moves along the annular groove and the outer edge of the steel plate. The cylinder is divided into left and right cavities by the annular one-way valve and the steel plate. The piston is placed in the left cavity. The piston rod extends out of the left end cover and connects to the anti-collision beam. The left and right cavities and the energy-absorbing box are filled with shear thickening liquid. During a low-speed collision, the piston rod moves from the left end cap toward the steel plate. The shear thickening fluid in the left cavity is squeezed through the annular gap, resulting in shear thickening and energy absorption. At this time, the piston rod's stroke has not reached the steel plate, and the internal pressure is insufficient to open the annular check valve. During a medium-speed collision, the piston rod moves, and the shear thickening fluid in the left chamber is insufficient to absorb all the energy. The internal pressure of the cylinder is relatively high, and the annular check valve opens. The shear thickening fluid in the right chamber is squeezed and subjected to shearing action, absorbing energy. At this time, the piston rod's stroke has not reached the steel plate.

2. The device for automobile collision avoidance according to claim 1, characterized in that: The annular groove has a length along the cylinder body that is 4-5 mm longer than the thickness of the steel plate, and is used for the up-and-down movement of the annular one-way valve.

3. The device for automobile collision avoidance according to claim 1, characterized in that: The annular one-way valve is equipped with four springs at its bottom, and the other end of the springs is connected to a boss provided on the inner wall of the cylinder.

4. The device for automobile collision avoidance according to claim 1, characterized in that: A sealing ring is provided between the piston rod and the left end cap for sealing.

5. The device for automobile collision avoidance according to claim 1, characterized in that: The piston rod protruding end is threaded, and the anti-collision beam is provided with a threaded flange that mates with it.

6. The device for automobile collision avoidance according to claim 1, characterized in that: The energy-absorbing box is a honeycomb energy-absorbing box, which has a honeycomb structure inside the box and is filled with a shear-thickening liquid inside the honeycomb structure.

7. The device for automobile collision avoidance according to claim 6, characterized in that: The honeycomb structure is formed by aluminum plates spaced apart inside, and the outside is sealed with rectangular aluminum alloy plates. The two ends are connected to form a sealed structure.

8. A car, characterized in that: Includes the device for vehicle collision avoidance as described in any one of claims 1-7.

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