A traction device for collision tests

Abstract

The present invention discloses a traction device for a collision test, which includes a first pulling rope, a second pulling rope, a first tractor, a rope winder, and a lateral spring. The first tractor is arranged in front of the test vehicle, and the first tractor pulls the test vehicle forward through the first pulling rope. The lateral spring is located on the right side of the advancing direction of the test vehicle. One end of the second pulling rope is connected to the frame at the front of the test vehicle, and the other end is connected to the rope winder. The rope winder includes a housing and a drum, a torsion spring, a ratchet wheel, and a pawl arranged inside the housing. The drum is used for winding the second pulling rope. The torsion spring is installed on the housing to drive the drum to rotate. The drum is provided with a ratchet wheel, and the housing is provided with a pawl to prevent the ratchet wheel from reversing. The housing is connected to the lateral spring. The present invention provides a new traction device, which drives the test vehicle to travel and roll over under the action of the traction device, providing conditions for detecting the protection ability of the vehicle to the occupants in the vehicle during a rollover.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive testing, and particularly to a traction device for collision testing. Background Art

[0002] Before a vehicle is put into production, various collision tests need to be carried out to detect the vehicle's ability to protect the occupants inside in the event of a collision. The existing technologies mainly focus on the frontal and side collisions of the vehicle, and do not target the collision between the vehicle and objects such as the ground during a rollover. The driving conditions of a vehicle are complex. Without conducting rollover collision tests, it is impossible to know the vehicle's ability to protect the occupants inside during a rollover collision. The traction devices of existing collision test systems can only target the frontal and side collisions of the vehicle and cannot tow the vehicle to have a rollover collision. Summary of the Invention

[0003] Aiming at the above-mentioned existing technologies, the present invention provides a traction device for collision testing, which provides a new traction device. Under the action of the traction device, the test vehicle is driven to travel and roll over, providing conditions for detecting the vehicle's ability to protect the occupants inside during a rollover.

[0004] The technical solution of the present invention is realized as follows:

[0005] A traction device for collision testing includes a first pulling rope, a second pulling rope, a first traction machine, a rope winder, and a lateral spring. The first traction machine is arranged in front of the test vehicle. The first traction machine pulls the test vehicle forward through the first pulling rope. The lateral spring is located on the right side of the advancing direction of the test vehicle. One end of the second pulling rope is connected to the frame at the front of the test vehicle, and the other end is connected to the rope winder. The rope winder includes a housing and a drum, a torsion spring, a ratchet, and a pawl arranged inside the housing. The drum is used for winding the second pulling rope. The torsion spring is installed on the housing to drive the drum to rotate. The drum is provided with a ratchet, and the housing is provided with a pawl to prevent the ratchet from reversing. The housing is connected to the lateral spring.

[0006] Further, the lateral spring is connected to a tension adjusting mechanism fixed on the ground. The tension adjusting mechanism includes a cylinder body, a liquid storage tank, and a piston. A partition is arranged inside the liquid storage tank. The partition divides the liquid storage tank into a left cavity and a right cavity. The left cavity is communicated with the cylinder body. The partition is provided with a plurality of through holes, a second spring, and a sealing plate. The through holes communicate the left cavity and the right cavity. The right cavity is communicated with the atmosphere. The second spring drives the sealing plate to cover the through holes. The piston is arranged inside the cylinder body. The piston is connected to the lateral spring through a connecting rope or a connecting rod.

[0007] Further, both the lateral spring and the second spring are helical springs.

[0008] Further, both the first draw rope and the second draw rope are connected to the test vehicle through an automatic unlocker. The automatic unlocker includes a vertical rod, a sleeve, a roller, a horizontal rod, a connecting rod, and a ring. The upper end of the vertical rod is fixed to the bottom of the frame of the test vehicle. The bottom of the vertical rod is slidably connected with the sleeve. The roller is provided at the bottom of the sleeve. The vertical rod is provided with two horizontal rods spaced apart by a preset distance. The sleeve is provided with a vertical connecting rod. The ring is used to connect with the first draw rope or the second draw rope. The ring is located between the two horizontal rods and sleeved on the connecting rod. When the roller is separated from the ground by a preset distance, the top of the connecting rod is lower than the lowermost horizontal rod.

[0009] Further, the vertical rod is provided with a third spring, and the third spring drives the sleeve to move away from the vertical rod.

[0010] Further, the third spring is a helical spring.

[0011] Further, both ends of the third spring are connected to the vertical rod and the sleeve.

[0012] Further, a movable pulley is provided on the first draw rope. The wheel frame of the movable pulley is connected to a fourth draw rope. The fourth draw rope is connected to a second tractor. The second tractor pulls the movable pulley to move through the fourth draw rope.

[0013] The beneficial effects of the present invention are as follows:

[0014] The present invention can be used for tests on vehicles to detect rollover collisions caused by sharp turning during high-speed driving. It can also set obstacles such as guardrails on the right side of the driving direction of the test vehicle for collision tests of the vehicle turning and rolling over when hitting the guardrail. As the test vehicle travels, the rope winder winds up the second draw rope. When the test vehicle travels to a position where the second draw rope is perpendicular to the driving track, the second draw rope is in the shortest extended state. When the vehicle continues to move forward, the second draw rope needs to be pulled out from the rope winder. Under the action of the torsion spring, the reel is driven to wind up the second draw rope. The elastic force of the torsion spring is small and can only wind up the second draw rope without being sufficient to affect the driving direction of the test vehicle. Since the reel for winding up the second draw rope is provided with a ratchet, and the housing is provided with a pawl to prevent the ratchet from reversing, the reel cannot reverse to release the draw rope at this time. When the test vehicle continues to travel, it will pull the rope winder, causing the spring to undergo elastic deformation. The spring exerts a lateral pulling force on the test vehicle to cause the vehicle to deflect to the right. The high-speed vehicle will roll over when deflecting and hit the ground. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only the preferred embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 Structural schematic diagram of a traction device for collision tests according to the present invention;

[0017] Figure 2 Structural schematic diagram of the rope winder of the present invention;

[0018] Figure 3 Structural schematic diagram of the tension adjustment mechanism of the present invention;

[0019] Figure 4 Structural schematic diagram of the automatic unlocker of the present invention;

[0020] In the figure, 1 is the first pulling rope, 2 is the second pulling rope, 3 is the first traction machine, 4 is the rope winder, 5 is the lateral spring, 6 is the housing, 7 is the drum, 8 is the torsion spring, 9 is the ratchet wheel, 10 is the ratchet pawl, 11 is the tension adjustment mechanism, 12 is the cylinder block, 13 is the liquid storage tank, 14 is the piston, 15 is the partition plate, 16 is the left cavity, 17 is the right cavity, 18 is the through hole, 19 is the second spring, 20 is the sealing plate, 21 is the connecting rope, 22 is the automatic unlocker, 23 is the vertical rod, 24 is the sleeve, 25 is the roller, 26 is the horizontal rod, 27 is the connecting rod, 28 is the ring, 29 is the third spring, 30 is the movable pulley, 31 is the fourth pulling rope, and 32 is the second traction machine. Specific embodiments

[0021] To better understand the technical content of the present invention, the following provides specific embodiments and further illustrates the present invention in conjunction with the accompanying drawings.

[0022] Referring to the figure, a traction device for collision tests includes a first pulling rope 1, a second pulling rope 2, a first tractor 3, a rope winder 4 and a lateral spring 5. The first tractor 3 is arranged in front of the test vehicle. The first tractor 3 pulls the test vehicle forward by means of the first pulling rope 1. The lateral spring 5 is located on the right side of the forward direction of the test vehicle. One end of the second pulling rope 2 is connected to the frame at the front of the test vehicle, and the other end is connected to the rope winder 4. The rope winder 4 includes a housing 6 and a drum 7, a torsion spring 8, a ratchet 9 and a pawl 10 arranged inside the housing 6. The drum 7 is used for winding up the second pulling rope 2. The torsion spring 8 is installed on the housing 6 to drive the drum 7 to rotate. The drum 7 is provided with a ratchet 9, and the housing 6 is provided with a pawl 10 to prevent the ratchet 9 from reversing. The housing 6 is connected to the lateral spring 5. When conducting a collision test on an automobile, the first pulling rope 1 is connected to the bottom of the front end of the frame, and the second pulling rope 2 is connected to the right side of the front end of the frame, preferably near the position of the right wheel. The first tractor 3 can be a winch or other device capable of winding up the pulling rope. When the first tractor 3 works, it winds up the first pulling rope 1, thereby pulling the test vehicle forward. The second pulling rope 2 is connected to the right side of the bottom of the front end of the frame. One end of the second pulling rope 2 is connected to the rope winder 4. The rope winder 4 includes a housing 6 and a drum 7, a torsion spring 8, a ratchet 9 and a pawl 10 arranged inside the housing 6. Under the action of the torsion spring 8, the drum 7 winds up the second pulling rope 2. The elastic force of the torsion spring 8 is small and can only wind up the second pulling rope 2 without being sufficient to affect the driving direction of the test vehicle. As the test vehicle moves forward, the rope winder 4 winds up the second pulling rope 2. When the test vehicle travels to a position where the second pulling rope 2 is perpendicular to the driving track, the second pulling rope 2 is in the shortest extended state. When the vehicle continues to move forward, the second pulling rope 2 needs to be pulled out from the rope winder 4. Since the drum 7 for winding up the second pulling rope 2 is provided with a ratchet 9 and the housing 6 is provided with a pawl 10 to prevent the ratchet 9 from reversing, the drum 7 cannot reverse to release the pulling rope at this time. When the test vehicle continues to move forward, it will pull the rope winder 4, causing the spring to undergo elastic deformation. The spring exerts a lateral pulling force on the test vehicle to cause the vehicle to deflect to the right. A high-speed moving vehicle will roll over when deflecting and hit the ground. The staff uses detection equipment to detect various parameters of the dummy in the test vehicle to obtain test data. The present invention can be used for testing the rollover collision caused by a sharp turn of a vehicle in a high-speed driving state. It can also set obstacles such as guardrails on the right side of the driving direction of the test vehicle for the collision test of the vehicle turning and hitting the guardrail and rolling over.

[0023] Optionally, the lateral spring 5 is directly fixed to the ground, with a simple structure and low cost. Alternatively, the lateral spring 5 is connected to a tension adjusting mechanism 11 fixed to the ground. The tension adjusting mechanism 11 includes a cylinder block 12, a liquid storage tank 13, and a piston 14. A partition 15 is provided in the liquid storage tank 13. The partition 15 divides the liquid storage tank 13 into a left cavity 16 and a right cavity 17. The left cavity 16 is communicated with the cylinder block 12. The partition 15 is provided with a plurality of through holes 18, a second spring 19, and a sealing plate 20. The through holes 18 communicate the left cavity 16 and the right cavity 17. The right cavity 17 is communicated with the atmosphere. The second spring 19 drives the sealing plate 20 to cover the through holes 18. The piston 14 is arranged in the cylinder block 12. The piston 14 is connected to the lateral spring 5 through a connecting rope 21 or a connecting rod. The liquid storage tank 13 is rotatably connected to the ground, facilitating the adjustment of the direction of the cylinder block 12. In the initial state, the sealing plate 20 covers the through holes 18, and the liquid in the left cavity 16 of the liquid storage tank 13 cannot flow into the cylinder block 12. When the experimental vehicle pulls the second pulling rope 2, the second pulling rope 2 first deforms the lateral spring 5. The lateral spring 5 gradually exerts a lateral pulling force on the experimental vehicle, and the lateral pulling force gradually increases, simulating that the experimental vehicle starts to turn right. When the deformation of the lateral spring 5 reaches a certain degree, the lateral spring 5 acts on the piston 14 through the connecting rope 21 or the connecting rod, pulling the piston 14 outwards to reduce the pressure in the cylinder block 12. When the pressure is reduced to a certain extent, the sealing plate 20 overcomes the acting force of the second spring 19 and slowly opens the partition 15. Due to the arrangement of a plurality of through holes 18, a large amount of liquid quickly flows into the left cavity after the plurality of through holes 18 are opened. The left cavity 16 is communicated with the cylinder block 12, so the cylinder block 12 is continuously replenished with liquid to keep the pressure in the cylinder block 12 in a relatively stable state. After the spring deformation reaches the preset value, it will drag the piston 14 to move outwards, avoiding further greater deformation of the spring. When applying a lateral pulling force to the test vehicle, the applied lateral force can be made more stable. The partition 15 divides the liquid storage tank 13 into a left cavity 16 and a right cavity 17, and then the through holes 18 are arranged on the partition 15. Since the area of the partition 15 is relatively large, more through holes 18 can be arranged, and the pressure in the cylinder block 12 can be quickly changed after the through holes 18 are opened. The right cavity 17 is communicated with the atmosphere. After the liquid in the right cavity 17 flows to the left cavity 16, the atmosphere enters the right cavity 17 to avoid the formation of negative pressure in the right cavity 17.

[0024] Specifically, both the lateral spring 5 and the second spring 19 are helical springs, with a simple structure, durability, and low cost.

[0025] Specifically, both the first drawstring 1 and the second drawstring 2 are connected to the test vehicle through an automatic unlocker 22. The automatic unlocker 22 includes a vertical rod 23, a sleeve 24, a roller 25, a horizontal rod 26, a connecting rod 27, and a circular ring 28. The upper end of the vertical rod 23 is fixed to the bottom of the frame of the test vehicle. The bottom of the vertical rod 23 is slidably connected to the sleeve 24. The bottom of the sleeve 24 is provided with the roller 25. The vertical rod 23 is provided with two horizontal rods 26 spaced apart by a preset distance. The sleeve 24 is provided with the vertical connecting rod 27. The circular ring 28 is used to connect to the first drawstring 1 or the second drawstring 2. The circular ring 28 is located between the two horizontal rods 26 and sleeved on the connecting rod 27. When the roller 25 is separated from the ground by a preset distance, the top of the connecting rod 27 is lower than the lowermost horizontal rod 26. The vertical rod 23 is fixed to the bottom of the frame by means of welding or bolt connection. The lower end of the vertical rod 23 is slidably connected to the sleeve 24, and the sleeve 24 can slide up and down relative to the vertical rod 23. Two horizontal rods 26 are fixed on the vertical rod 23. A vertical connecting rod 27 is provided on the sleeve 24. A roller 25 is provided at the bottom of the sleeve 24. When the roller 25 contacts the ground, the top of the connecting rod 27 is higher than the uppermost horizontal rod 26, and the circular ring 28 sleeved on the connecting rod 27 is blocked and cannot slip off from above the connecting rod 27. When the height of the test vehicle from the ground is greater than the preset distance, the sleeve 24 and the roller 25 slide downward, causing the connecting rod 27 to be lower than the lowermost horizontal rod 26, and the circular ring 28 is pushed open to disengage from the connecting rod 27. The test vehicle loses the pulling force of the vehicle, so that the pulling force is released after the test vehicle rolls over. When pulling the test vehicle to move, the roller 25 contacts the ground to reduce the frictional force of movement.

[0026] Specifically, the vertical rod 23 is provided with a third spring 29, and the third spring 29 drives the sleeve 24 to move away from the vertical rod 23. After the test vehicle rolls over and leaves the ground by a preset distance, the third spring 29 pushes the sleeve 24 to slide, promoting the circular ring 28 to disengage from the connecting rod 27.

[0027] Specifically, the third spring 29 is a helical spring. It has a simple structure, is durable, and also has the advantage of low cost.

[0028] Specifically, both ends of the third spring 29 are connected to the vertical rod 23 and the sleeve 24. The third spring 29 connects the vertical rod 23 and the sleeve 24, which can prevent the sleeve 24 from detaching from the vertical rod 23.

[0029] Optionally, when the test site is limited and the distance of the first towing rope 1 is short, after the test vehicle turns, the pulling force of the first towing rope 1 has a large difference from the driving direction of the test vehicle. In the present invention, a movable pulley 30 is provided on the first towing rope 1, the wheel frame of the movable pulley 30 is connected to a fourth towing rope 31, the fourth towing rope 31 is connected to a second towing machine 32, and the second towing machine 32 pulls the movable pulley 30 to move through the fourth towing rope 31 to adjust the towing direction of the first towing rope 1 on the test vehicle. The second towing machine 32 can be a winch or other equipment that can reel in the fourth towing rope. The second towing can be operated by experienced staff or controlled by an automatic control system.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A traction device for collision tests, characterized in that, It includes a first tow rope, a second tow rope, a first tractor, a rope winder and a lateral spring. The first tractor is arranged in front of the test vehicle. The first tractor pulls the test vehicle forward through the first tow rope. The lateral spring is located on the right side of the advancing direction of the test vehicle. One end of the second tow rope is connected to the frame at the front of the test vehicle, and the other end is connected to the rope winder. The rope winder includes a housing and a drum, a torsion spring, a ratchet and a pawl arranged inside the housing. The drum is used for winding the second tow rope. The torsion spring is installed on the housing to drive the drum to rotate. The drum is provided with a ratchet, and the housing is provided with a pawl to prevent the ratchet from reversing. The housing is connected to the lateral spring. Both the first tow rope and the second tow rope are connected to the test vehicle through an automatic unlocker. The automatic unlocker includes a vertical rod, a sleeve, a roller, a horizontal rod, a connecting rod and a ring. The upper end of the vertical rod is fixed to the bottom of the frame of the test vehicle. The bottom of the vertical rod is slidably connected with the sleeve. The bottom of the sleeve is provided with the roller. The vertical rod is provided with two horizontal rods spaced at a preset distance. The sleeve is provided with a vertical connecting rod. The ring is used for connecting with the first tow rope or the second tow rope. The ring is located between the two horizontal rods and sleeved on the connecting rod. When the roller is separated from the ground by a preset distance, the top of the connecting rod is lower than the lowermost horizontal rod.

2. The traction device for collision test according to claim 1, characterized in that, The lateral spring is connected to a tension adjusting mechanism fixed on the ground. The tension adjusting mechanism includes a cylinder block, a liquid storage tank and a piston. A partition is arranged in the liquid storage tank. The partition divides the liquid storage tank into a left cavity and a right cavity. The left cavity is communicated with the cylinder block. The partition is provided with a plurality of through holes, a second spring and a sealing plate. The through holes communicate the left cavity and the right cavity. The right cavity is communicated with the atmosphere. The second spring drives the sealing plate to cover the through holes. The piston is arranged in the cylinder block. The piston is connected to the lateral spring through a connecting rope or a connecting rod.

3. The traction device for a collision test according to claim 1, characterized in that, Both the lateral spring and the second spring are helical springs.

4. The traction device for a collision test according to claim 1, characterized in that, The vertical rod is provided with a third spring. The third spring drives the sleeve to move away from the vertical rod.

5. The traction device for collision test according to claim 4, characterized in that, The third spring is a helical spring.

6. The traction device for a collision test according to claim 4, characterized in that, Both ends of the third spring are connected to the vertical rod and the sleeve.

7. A traction device for a collision test according to claim 1, characterized in that, A movable pulley is arranged on the first tow rope. The wheel frame of the movable pulley is connected to a fourth tow rope. The fourth tow rope is connected to a second tractor. The second tractor pulls the movable pulley to move through the fourth tow rope.

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