Multi-stroke lightning protection seat energy absorption device with self-resetting function

Abstract

This invention relates to a multi-stroke lightning protection seat energy absorption device with a self-resetting function. It includes an upper connecting block, a housing, a reset mechanism, a steel strip limiting pin, a lower connecting block, a serrated steel strip, a steel strip limiting gear pin, a pawl, a pawl spring, a guide rail, and an inverted T-shaped connecting rod. The vertical end of the connecting rod connects to the upper connecting block. A slide rail groove is provided on the horizontal bar of one side of the connecting rod. The guide rail and the housing are fixed together. A gap is provided between the slide rail groove and the main body of the connecting rod for the serrated steel strip to pass through. A pawl is provided at one corner of the horizontal bar facing the guide rail. The other end of the pawl engages with the serrations on the serrated steel strip. The side of the serrated steel strip facing the pawl is serrated, while the side facing the guide rail is smooth. Both ends of the serrated steel strip are free ends, and triangular pins pass sequentially through the middle of the serrated steel strip. The housing is connected to the lower connecting block, the lower connecting block is connected to the lower crossbeam of the seat, and the upper connecting block is connected to the upper crossbeam of the seat. This invention has a simple structure, is easy to install, has high energy absorption efficiency, and is low in cost.

Description

Technical Field

[0001] This invention belongs to the field of vehicle explosion protection, specifically relating to a multi-stroke lightning protection seat energy absorption device with self-resetting function. Background Technology

[0002] When a vehicle is performing a mission, the impact of an explosion and a fall will directly affect the occupants through the seats, causing some damage. In order to protect the occupants, it is necessary to buffer, attenuate, and absorb the impact transmitted to the seats.

[0003] Currently, common seat energy-absorbing devices achieve their energy-absorbing effect through the plastic deformation of materials, reducing the impact injury to occupants. One widely used type of cushioning energy-absorbing device primarily uses the plastic deformation generated by bending a metal strip to attenuate and isolate the impact energy transmitted from the vehicle body to the seat. However, it cannot automatically return to its initial state after different levels of impact, requiring replacement of the energy-absorbing device to cope with the next stage of impact. It does not have the capability to adapt to different levels of impact and perform multi-stage energy absorption. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stroke lightning protection seat energy absorption device with self-resetting function.

[0005] The technical solution to achieve the purpose of this invention is: a multi-stroke lightning protection seat energy absorption device with self-resetting function, including an upper connecting block, a box, a reset mechanism, a steel belt limiting pin, a lower connecting block, a serrated steel belt, a steel belt limiting gear pin, a claw, a claw spring, a guide rail and a connecting rod.

[0006] The connecting rod is inverted T-shaped. The vertical end of the connecting rod is fixedly connected to the upper connecting block. The horizontal bar on one side of the connecting rod has a slide rail groove that mates with the guide rail. The guide rail and the housing are fixed. There is a gap between the slide rail groove and the main body of the connecting rod for the serrated steel strip to pass through. One corner of the horizontal bar of the connecting rod facing the guide rail has a stepped groove. A rotating pawl is installed in the stepped groove through a pawl spring. The other end of the pawl mates with the serrations on the serrated steel strip. The side of the serrated steel strip facing the pawl is serrated, and the side facing the guide rail is smooth. Both ends of the serrated steel strip are free ends. The middle of the serrated steel strip is successively limited and absorbs impact energy by a triangular steel strip limiting gear pin, a steel strip limiting pin, and a steel strip limiting gear pin.

[0007] The reset mechanism is used to reset the connecting rod after it has absorbed energy.

[0008] The box body and the lower connecting block are fixedly connected. The lower connecting block is connected to the lower crossbeam of the seat, and the upper connecting block is connected to the upper crossbeam of the seat.

[0009] Furthermore, it also includes two connecting rod limiting bolts, which are connected to the housing. The two connecting rod limiting bolts are respectively set on both sides of the connecting rod vertical rod. The connecting rod moves vertically along the guide rail and the connecting rod limiting bolts. The connecting rod limiting bolts are used to constrain the initial position and maximum stroke of the connecting rod.

[0010] Furthermore, the upper connecting block is fixedly connected to the connecting rod by spot welding, the guide rail is spot welded to the box body, and the steel belt limit pin and two steel belt limit gear pins are connected to the box body through the pin holes of the box body.

[0011] Furthermore, the steel belt limiting pin and the two steel belt limiting gear pins are distributed in an isosceles triangle. The steel belt limiting gear pins mesh with the sawtooth surface of the sawtooth steel belt, and the steel belt limiting pins contact the smooth surface of the sawtooth steel belt.

[0012] Furthermore, the reset mechanism includes a constant force disc spring, the outermost end of which is connected to the connecting rod, and the innermost end is fixedly connected to the disc spring constraint bolt, which is connected to the housing through a bolt hole.

[0013] Furthermore, the crossbar away from the guide rail of the connecting rod is provided with a through hole for the outermost end of the constant force spring to pass through. The outermost end of the constant force disc spring passes through the connecting rod through hole and is connected to the connecting rod by the disc spring fixing bolt.

[0014] Furthermore, the end of the guide rail that connects to the housing is a protrusion, and the opposite side is a groove. The guide rail is connected to the housing through the protrusion. The slide rail groove on the connecting rod that matches the guide rail groove is a protrusion, and the notch that matches the guide rail protrusion is a notch.

[0015] Furthermore, the lower surface of the sawtooth steel strip that contacts the cleaver is an inner semi-straight surface and an outer semi-sloping surface. During the energy absorption stroke, the cleaver presses against the sawtooth, making it difficult for the cleaver to fall off the sawtooth steel strip. The other side of the sawtooth is a slope. During the reset stroke, the cleaver contacts the slope, the connecting rod moves downward, and the cleaver slides on the back of the steel strip sawtooth into the next sawtooth gap, so the sawtooth steel strip will not move.

[0016] Furthermore, the lower connecting block and the housing are connected by connecting bolts for the lower connecting block.

[0017] Furthermore, the magnitude of the restoring force of the constant force coil spring, the material, thickness, and width of the serrated steel strip, and the position of the pin are determined according to the vehicle model.

[0018] Compared with the prior art, the significant advantages of this invention are:

[0019] (1) The present invention uses a claw and a serrated steel strip to realize the multi-stroke energy absorption function of the device. During the energy absorption stroke, the claw drives the serrated steel strip to move upward, and the serrated steel strip undergoes plastic deformation to realize the attenuation of impact energy. The constant force coil spring is used to realize the self-resetting function of the device. When the coil spring retracts, it drives the connecting rod and the claw to move downward, the device returns to the initial state, the claw relocks the serrated steel strip, and continues the energy absorption of the next stroke.

[0020] (2) The present invention does not require a starting force, and the steel belt can absorb impacts of different degrees from multiple stages.

[0021] (3) The present invention can determine the state of the energy absorption device based on the length of the steel strip extending out of the box, so as to replace the steel strip in a timely manner.

[0022] (4) The present invention uses a constant force coil spring, which, compared with traditional springs, applies an almost constant force during stretching and contraction, thus avoiding secondary injury to the occupants.

[0023] (5) The present invention can make the coil spring and the energy-absorbing steel strip have different degrees of energy absorption effect by changing the material, thickness and width of the coil spring and the energy-absorbing steel strip, as well as the position of the steel strip limiting pin, so as to adapt to different types of vehicles.

[0024] (6) The present invention has a simple structure, fewer parts, simple installation, high energy absorption efficiency, and the device can be reused by replacing each part, which greatly reduces the cost. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the energy absorption device of the present invention in its initial state.

[0026] Figure 2 This is an exploded view of the energy-absorbing device of the present invention.

[0027] Figure 3 This is a cross-sectional view of the connecting rod and guide rail assembly of the energy absorption device of the present invention.

[0028] Figure 4 This is a schematic diagram showing the installation position of the energy-absorbing device and the seat in this invention.

[0029] Figure 5 This is a cross-sectional view of the energy absorption stroke of the energy absorption device of the present invention.

[0030] Figure 6 This is a cross-sectional view of the self-resetting stroke of the energy absorption device of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Upper connecting block, 2-Energy absorption device housing, 3-Coil spring fixing bolt, 4-Constant force coil spring, 5-Steel strip limiting pin, 6-Coil spring constraint bolt, 7-Lower connecting block connecting bolt, 8-Lower connecting block, 9-Serrated steel strip, 10-Steel strip limiting gear pin, 11-Claw constraint bolt, 12-Claw, 13-Claw spring, 14-Guide rail, 15-Connecting rod, 16-Connecting rod limiting bolt, 17-Energy absorption device. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings.

[0034] The purpose of this invention is to provide a self-resetting, multi-stroke lightning protection seat energy-absorbing device. When a vehicle is subjected to an explosive impact, this device buffers and absorbs the impact, reducing the risk of injury to occupants. A self-resetting mechanism returns the energy-absorbing device to its initial state, allowing for further buffering and energy absorption in the next stage, thus providing protection for occupants against impacts of varying degrees and at different stages. Furthermore, this invention allows for the determination of the device's energy absorption status by the travel of the steel belt, enabling timely replacement of the steel belt. The structure is simple and easy to replace, and steel belts with different energy absorption capacities can achieve more precise protection for occupants.

[0035] like Figure 1-4 As shown, a multi-stroke lightning protection seat energy absorption device with self-resetting function includes an upper connecting block 1, a lower connecting block 8, a housing 2, a connecting rod 15, a guide rail 14, a constant force coil spring 4, a serrated steel strip 9, a claw 12, and pins and bolts. The upper connecting block 1 and the lower connecting block 8 of the energy absorption device are connected to the upper crossbeam and lower crossbeam of the seat, respectively, by fasteners.

[0036] During the operation of the energy absorption device, the upper connecting block 1 is fixedly connected to the connecting rod 15 by spot welding. The connecting rod 15 moves vertically along the guide rail 14 and the connecting rod limiting bolt 16. The connecting rod limiting bolt 16 contacts the lower surface of the upper connecting block, constraining the initial position and maximum stroke of the connecting rod. In addition, it can reduce the lateral force of the connecting rod 15 on the guide rail, so that the connecting rod has a relatively stable vertical motion trajectory.

[0037] like Figure 3 As shown, the connecting rod 15 is inverted T-shaped, with a rectangular through hole on one side and a rectangular hollow area on the other side. Inside, there is a protrusion in the middle of one side, with a notch on opposite sides. The guide rail 14 is spot-welded to the housing 2, with grooves on both the top and bottom sides. The protrusion and notch on both sides of the connecting rod 15 pass through the grooves and engage with the guide rail 14.

[0038] The connecting rod 15 is connected to the claw 12 and the claw spring 13 via the claw constraint bolt 11. One side of the serrated steel strip 9 is smooth and in contact with the guide rail 14, while the other side is serrated. One side of the serration is a semi-straight surface, and the semi-sloping surface prevents the claw from interfering with the serration during the reset stroke. During the energy absorption stroke, the claw 12 presses against the serration, making it difficult for the claw 12 to fall off the steel strip 9. The serrated side is a slope, and during the reset stroke, the claw 12 contacts the slope. The connecting rod 15 moves downward, and the claw 12 slides on the back of the serration of the steel strip 9 into the next serration gap. The steel strip does not move. The two ends of the claw spring 13 are on the panels of the claw 12 and the connecting rod 15, respectively. When the reset stroke ends, the claw spring 13 returns the claw 12 to its original position.

[0039] Both ends of the steel belt 9 are free ends, and are limited by steel belt limiting gear pins 10 and 5. The middle of the steel belt limiting gear pin 10 has teeth that mesh with the sawtooth surface of the steel belt 9. The steel belt limiting pin 5 is a smooth cylindrical surface that contacts the smooth surface of the steel belt 9. During the upward movement, the steel belt 9 absorbs impact energy by plastic deformation through wrapping and sticking with the three pins. The steel belt limiting gear pin 10 contacts the sawtooth surface of the steel belt 9, transmitting the upward movement of the steel belt 9. The three pins are connected to the box 2 through the pin holes of the box 2, and their axes are parallel to each other and distributed in an isosceles triangle.

[0040] The upper end of the constant force coil spring 4 passes through the rectangular through hole of the connecting rod 15 and is connected to the connecting rod 15 by the coil spring fixing bolt 3. The end is fixedly connected to the coil spring constraint bolt 6. The coil spring constraint bolt 6 is connected to the box body 2 through the bolt hole. The constant force coil spring 4 has a relatively constant force when it is stretched and contracted, which ensures the stability of the energy absorption process of the device and will not cause rapid and nonlinear retraction due to excessive stroke, thereby causing secondary impact injury to the occupants.

[0041] The lower connecting block 8 is connected to the box body 2 by connecting bolts. At this time, the components of the energy absorption device constitute a complete multi-stroke system with energy absorption and self-resetting.

[0042] The specific working principle of this invention is as follows:

[0043] Energy absorption stroke such as Figure 5As shown, when a vehicle is subjected to an impact such as an explosion, the upper crossbeam of the seat moves the upper connecting block 1 upward. The connecting rod 15, which is fixedly connected to the upper connecting block 1, moves along the guide rail 14. The lower surface of the claw 12 is fixed to the connecting rod 15, and the upper surface presses against the serrations of the steel strip 9, causing the steel strip 9 to move upward. Due to the constraint of the steel strip limiting pins 5 and 10, the part of the steel strip 9 that is not wrapped and attached to the pins gradually wraps and attaches to the pins during the upward movement and produces plastic deformation, thereby absorbing and attenuating the impact energy, reducing the vertical impact on the occupant's pelvis and lumbar spine, and improving the seat's protective performance. In addition, this invention can achieve different degrees of energy absorption effect by changing the material, thickness, and width of the energy-absorbing steel strip and the position of the steel strip limiting pins, so as to adapt to different types of vehicles.

[0044] Self-reset travel as follows Figure 6 As shown, when the energy absorption stroke ends, the constant force spring 4, which is stretched upward with the connecting rod 15, begins to contract, causing the connecting rod 15 to move downward. The connecting rod 15 causes the pawl 12 to slide on the back of the steel strip 9's serrations. The steel strip 9 will not move due to the constraint of the limiting pin. The connecting rod 15 returns to its initial position, and the pawl spring 13 resets the pawl 12 to press against the serrations of the steel strip 9. The device then begins the next stage of the energy absorption stroke.

Claims

1. A multi-stroke lightning protection seat energy absorption device with self-resetting function, characterized in that, It includes an upper connecting block (1), a box body (2), a reset mechanism, a steel belt limiting pin (5), a lower connecting block (8), a serrated steel belt (9), two steel belt limiting gear pins, a pawl (12), a pawl spring (13), a guide rail (14), and a connecting rod (15). The connecting rod (15) is inverted T-shaped. The vertical end of the connecting rod (15) is fixedly connected to the upper connecting block (1). A slide rail groove that mates with the guide rail (14) is provided on the horizontal bar on one side of the connecting rod (15). The guide rail (14) is fixed to the box body. A gap is provided between the slide rail groove and the main body of the connecting rod for the sawtooth steel strip (9) to pass through. A stepped groove is provided on one corner of the horizontal bar face of the connecting rod (15) to the guide rail. A rotating pawl (12) is provided in the stepped groove through a pawl spring (13). The free end of the pawl (12) and the sawtooth steel strip (9) are connected. The sawtooth meshing on the toothed steel belt (9) is as follows: the side of the toothed steel belt (9) facing the chuck is sawtooth-shaped, and the side facing the guide rail is smooth. Both ends of the toothed steel belt (9) are free ends. The middle of the toothed steel belt (9) is successively limited and absorbs impact energy by a triangular steel belt limiting gear pin, a steel belt limiting pin and a steel belt limiting gear pin from top to bottom. Both steel belt limiting gear pins mesh with the sawtooth surface of the toothed steel belt (9), and the steel belt limiting pin (5) contacts the smooth surface of the toothed steel belt (9). The reset mechanism is used for the reset of the connecting rod after it absorbs energy; the reset mechanism includes a constant force disc spring (4), the outermost end of the constant force disc spring (4) is connected to the cross bar of the connecting rod (15) away from the guide rail, and the innermost end is fixedly connected to the disc spring constraint bolt (6), and the disc spring constraint bolt (6) is connected to the box body (2) through the bolt hole; The box body (2) and the lower connecting block (8) are fixedly connected. The lower connecting block (8) is connected to the lower crossbeam of the seat, and the upper connecting block (1) is connected to the upper crossbeam of the seat.

2. The apparatus according to claim 1, characterized in that, It also includes two connecting rod limiting bolts (16), which are connected to the housing (2). The two connecting rod limiting bolts (16) are respectively set on both sides of the connecting rod vertical rod. The connecting rod (15) moves vertically along the guide rail (14) and the connecting rod limiting bolts (16). The connecting rod limiting bolts (16) are used to constrain the initial position and maximum stroke of the connecting rod.

3. The apparatus according to claim 2, characterized in that, The upper connecting block (1) is fixedly connected to the connecting rod (15) by spot welding. The guide rail (14) is spot welded to the box body (2). The steel belt limiting pin (5) and the two steel belt limiting gear pins (10) are connected to the box body (2) through the pin holes of the box body (2).

4. The apparatus according to claim 3, characterized in that, The steel belt limiting pin (5) and the two steel belt limiting gear pins (10) are distributed in an isosceles triangle.

5. The apparatus according to claim 4, characterized in that, The connecting rod (15) has a through hole on the crossbar away from the guide rail for the outermost end of the constant force spring to pass through. The outermost end of the constant force disc spring (4) passes through the through hole of the connecting rod (15) and is connected to the connecting rod (15) by the disc spring fixing bolt (3).

6. The apparatus according to claim 5, characterized in that, The guide rail (14) has a protrusion at one end connected to the box body and a groove on the opposite side. The guide rail is connected to the box body through the protrusion. The slide rail groove on the connecting rod (15) has a protrusion that matches the groove of the guide rail and a notch that matches the protrusion of the guide rail.

7. The apparatus according to claim 6, characterized in that, The lower surface of the sawtooth side of the sawtooth steel strip (9) that contacts the chuck is an inner semi-straight surface and an outer semi-sloping surface. During the energy absorption stroke, the chuck (12) presses against the sawtooth, making it difficult for the chuck (12) to fall off the sawtooth steel strip (9). The other side of the sawtooth is a slope. During the reset stroke, the chuck (12) contacts the slope, the connecting rod (15) moves downward, and the chuck (12) slides on the back of the sawtooth of the sawtooth steel strip (9) into the next sawtooth gap. The sawtooth steel strip (9) will not move.

8. The apparatus according to claim 7, characterized in that, The lower connecting block (8) and the box body (2) are connected by the lower connecting block connecting bolt (7).

9. The apparatus according to claim 8, characterized in that, The magnitude of the restoring force of the constant force coil spring, the material, thickness and width of the serrated steel strip (9), and the position of the pin are determined according to the vehicle model.

Images