CN114148367B - Urban rail transit vehicle collision energy-absorbing device - Google Patents
Urban rail transit vehicle collision energy-absorbing device Download PDFInfo
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- CN114148367B CN114148367B CN202111512872.2A CN202111512872A CN114148367B CN 114148367 B CN114148367 B CN 114148367B CN 202111512872 A CN202111512872 A CN 202111512872A CN 114148367 B CN114148367 B CN 114148367B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F19/00—Wheel guards; Bumpers; Obstruction removers or the like
- B61F19/04—Bumpers or like collision guards
Abstract
The invention discloses an urban rail transit vehicle collision energy-absorbing device which comprises a fixed end frame, a flame-retardant assembly, a first energy-absorbing plate, a buffer assembly, energy-absorbing pipes, a second energy-absorbing plate and an energy-absorbing assembly, wherein the flame-retardant assembly is arranged at one end of the fixed end frame; dismounting grooves are formed in two sides of the center of the end face of the other end of the fixed end frame; the collision energy absorbing device for the urban rail transit vehicle is simple in structure and convenient to install; when the energy-absorbing device is used, the multi-stage buffer structure is arranged, so that a good energy-absorbing effect can be achieved; meanwhile, the flame-retardant protective effect is good, and the safety after collision is effectively improved.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to an urban rail transit vehicle collision energy absorbing device.
Background
The urban rail transit is a vehicle transportation system for carrying out bearing and guiding by adopting a rail structure, and a fully-closed or partially-closed special rail line is arranged according to the overall planning requirement of the urban traffic, and a public transportation mode for transporting a quite large amount of passenger flow is realized in a train or single car mode.
When the railway traffic vehicle is used, a collision energy absorbing device is required to be installed at one end of vehicle equipment so as to reduce the impact generated during collision; the collision energy absorbing device in the prior art has the advantages that when in use, the buffer structure is single and crude, the energy absorbing effect is poor, and when in long-time use, the buffer structure is easy to damage; in addition, during collision, the temperature of the collision part is higher, the fire phenomenon is easy to occur, and the safety is influenced, so that the design of the collision energy absorbing device for the urban rail transit vehicle is very necessary.
Disclosure of Invention
The invention solves the problem of providing the collision energy absorbing device for the urban rail transit vehicle, which has simple structure and convenient installation; when the energy-absorbing device is used, the multi-stage buffer structure is arranged, so that a good energy-absorbing effect can be achieved; meanwhile, the flame-retardant protective effect is good, and the safety after collision is effectively improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides an urban rail transit vehicle collision energy-absorbing device, includes fixed end frame, fire-retardant subassembly, first energy-absorbing board, buffer module, energy-absorbing pipe, second energy-absorbing board and energy-absorbing subassembly, the one end of fixed end frame is provided with fire-retardant subassembly, the other end outside of fixed end frame is provided with first energy-absorbing board, and is provided with buffer module between first energy-absorbing board and the fixed end frame, the other end fixed mounting of first energy-absorbing board has a plurality of energy-absorbing pipe, and the one end fixed mounting of a plurality of energy-absorbing pipe has the second energy-absorbing board, the outside of second energy-absorbing board is provided with energy-absorbing subassembly;
the buffer component comprises a disassembly and assembly groove, a splicing plate, a spring groove, a powerful spring, a spring pressing plate, sleeves, a pressing rod, a fixed underframe, a guide rod and a piston, wherein the disassembly and assembly groove is formed in two sides of the center of the end face of the other end of the fixed end frame, the splicing plate is fixedly installed in the middle of the end face of the splicing plate, a plurality of spring grooves are formed in the center of the end face of the spring groove, the powerful spring is fixedly installed in the center of the end face of the spring groove, the spring pressing plate is fixedly installed at one end of the powerful spring, the other end of the spring pressing plate is in fit connection with the first energy absorption plate, a plurality of sleeves are fixedly installed around the end face of the other end of the fixed end frame, the pressing rod is fixedly connected with the end face of the first energy absorption plate, the fixed underframe is fixedly installed at one end of the sleeve, the guide rod is fixedly installed in the center of the end face of the fixed underframe, one end of the guide rod is inserted and installed in the pressing rod, the piston is fixedly installed at one end of the guide rod, and the piston is in fit connection with the inner wall of the pressing rod;
the center of the periphery of one end of the fixed end frame is fixedly provided with an installation clamping plate through welding, the installation clamping plate is of an L-shaped structure, and the center of the end face of the installation clamping plate is provided with two positioning holes;
the centers of the end surfaces of the two sides of the assembly plate are fixedly provided with anti-falling convex blocks, the two sides of the inner wall of the disassembly groove are provided with anti-falling grooves, and the anti-falling convex blocks are inserted and installed in the anti-falling grooves;
one end of the dismounting groove is fixedly provided with a positioning plate through a screw, and the inner side end surface of the positioning plate is in fit connection with one end of the assembly plate;
the periphery of the inner wall of the sleeve is provided with a sealing sliding groove, the periphery of one end of the compression bar is provided with a sealing sliding block, and the sealing sliding blocks are inserted and installed in the sealing sliding groove;
the energy absorption tube is of a metal thin-wall energy absorption tube structure;
the flame-retardant assembly comprises a flame-retardant box body and buffer rubber, wherein the buffer rubber is fixedly arranged at the corner positions around one end of the fixed end frame, and the flame-retardant box body is fixedly arranged at the center of one end of the fixed end frame;
the flame retardant box body is internally filled with a flame retardant;
the energy absorption assembly comprises a crumple frame, an anti-collision beam and energy absorption boxes, the crumple frames are fixedly arranged on two sides of the center of the end face of the second energy absorption plate, the anti-collision beam is fixedly arranged on the outer sides of the two crumple frames, and a plurality of energy absorption boxes are fixedly arranged on the end face of the anti-collision beam;
and the periphery of the end face of the second energy absorption plate is fixedly provided with an airbag assembly.
The beneficial effects of the invention are as follows:
1. the collision energy-absorbing device for the urban rail transit vehicle is simple in structure and convenient to install, the installation clamping plate is connected with equipment through the fastener, so that the fixed end frame and the equipment are installed, a flame-retardant function can be achieved through the flame-retardant assembly, impact is transmitted to the fixed end frame, the fixed end frame is supported by the buffer rubber and the equipment, and a good buffer effect can be achieved through the buffer rubber; when the impact is overlarge, after the fixed end frame deforms, the flame-retardant box body is damaged, so that the flame retardant is leaked, the leaked flame retardant can be effectively prevented from burning and igniting, and the safety after collision is effectively improved.
2. The collision energy absorbing device for the urban rail transit vehicle has good buffering effect by arranging the multi-stage buffering structure when in use; when collision occurs, the impact is transferred to the second energy-absorbing plate through the energy-absorbing assembly and is transferred to the energy-absorbing tube and the first energy-absorbing plate through the second energy-absorbing plate, the buffer assembly is transferred through the first energy-absorbing plate, when the energy-absorbing box is contacted with a collided object, the energy-absorbing box and the anti-collision beam are deformed, the energy-absorbing can be supported, the impact is transferred to the second energy-absorbing plate through the crumple frame, the safety airbag assembly works, the safety airbag assembly can pop up the safety airbag, the energy-absorbing buffer effect is achieved between the second energy-absorbing plate and the anti-collision beam, and when the impact is transferred to the energy-absorbing tube, the energy-absorbing tube generates folding plastic deformation after being subjected to a certain axial load, so that a large amount of collision kinetic energy is consumed, and the energy-absorbing aim is achieved.
3. When the collision energy-absorbing device for the urban rail transit vehicle is used, when the first energy-absorbing plate is impacted, the first energy-absorbing plate is respectively transmitted to the strong spring and the sleeve through the spring pressing plate and the strong spring, impact kinetic energy can be absorbed through elastic deformation of the strong spring, and meanwhile, when the first energy-absorbing plate is transmitted to the sleeve through the pressure rod, the guide rod on one side of the fixed chassis pushes the piston to slide with the inner wall of the pressure rod, so that air in the pressure rod is compressed, and a buffering effect is achieved; after long-time use, the powerful spring is easy to produce and fatigued , so that the buffer effect of the powerful spring is affected, the positioning plate can be removed from one end of the dismounting groove, the assembly plate is moved out of the dismounting groove, the powerful spring in the spring groove is replaced, the assembly plate is reset and installed in the dismounting groove after replacement, and the positioning plate is installed at one end of the assembly plate in the dismounting groove, so that daily maintenance is facilitated.
Drawings
FIG. 1 is a schematic view of a first overall structure of the present invention;
FIG. 2 is a schematic diagram of a second overall structure of the present invention;
FIG. 3 is an overall front view of the present invention;
FIG. 4 is an overall side view of the present invention;
FIG. 5 is an overall top view of the present invention;
FIG. 6 is an overall cross-sectional view of the present invention;
FIG. 7 is a schematic view of a partial structure of the present invention;
legend description: 1. fixing the end frame; 2. installing a clamping plate; 3. a flame retardant assembly; 4. a first energy absorbing plate; 5. a buffer assembly; 6. an energy absorption tube; 7. a second energy absorbing plate; 8. an energy absorbing assembly; 31. a flame retardant box; 32. a buffer rubber; 51. a disassembly and assembly groove; 52. assembling plates; 53. a spring groove; 54. a strong spring; 55. a spring pressing plate; 56. a sleeve; 57. a compression bar; 58. fixing the underframe; 59. a guide rod; 510. a piston; 511. a positioning plate; 81. an airbag assembly; 82. a collapsing frame; 83. an anti-collision beam; 84. and the energy absorption box.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Specific examples are given below.
Referring to fig. 1-7, an urban rail transit vehicle collision energy-absorbing device comprises a fixed end frame 1, a flame-retardant assembly 3, a first energy-absorbing plate 4, a buffer assembly 5, energy-absorbing pipes 6, a second energy-absorbing plate 7 and an energy-absorbing assembly 8, wherein the flame-retardant assembly 3 is arranged at one end of the fixed end frame 1, the first energy-absorbing plate 4 is arranged outside the other end of the fixed end frame 1, the buffer assembly 5 is arranged between the first energy-absorbing plate 4 and the fixed end frame 1, a plurality of energy-absorbing pipes 6 are fixedly arranged at the other end of the first energy-absorbing plate 4, the second energy-absorbing plate 7 is fixedly arranged at one end of the plurality of energy-absorbing pipes 6, and the energy-absorbing assembly 8 is arranged outside the second energy-absorbing plate 7;
the buffer component 5 comprises a dismounting groove 51, a splicing plate 52, a spring groove 53, a powerful spring 54, a spring pressing plate 55, a sleeve 56, a pressing rod 57, a fixed underframe 58, a guide rod 59 and a piston 510, wherein the dismounting groove 51 is formed in two sides of the center of the end face of the other end of the fixed end frame 1, the splicing plate 52 is fixedly mounted in the inner part of the dismounting groove 51, a plurality of spring grooves 53 are formed in the center of the end face of the splicing plate 52, the powerful spring 54 is fixedly mounted in the center of the end face of the spring groove 53, the spring pressing plate 55 is fixedly mounted at one end of the powerful spring 54, the other end of the spring pressing plate 55 is in fit connection with the first energy absorption plate 4, the plurality of sleeves 56 are fixedly mounted around the end face of the other end of the fixed end frame 1, the pressing rod 57 is fixedly mounted at the other end of the inner part of the sleeve 56, the inner end of the sleeve 56 is fixedly mounted with the fixed underframe 58, the guide rod 59 is fixedly mounted at the center of the end face of the fixed underframe 58, one end of the guide rod 59 is spliced in the compression rod 57, one end of the guide rod 59 is fixedly mounted with the piston 510, and the piston 510 is in fit connection with the inner wall of the pressing rod 57;
the center around one end of the fixed end frame 1 is fixedly provided with an installation clamping plate 2 through welding, the installation clamping plate 2 is of an L-shaped structure, and the center of the end face of the installation clamping plate 2 is provided with two positioning holes, so that the installation clamping plate 2 is conveniently connected with equipment through a fastener, and the fixed end frame 1 is installed with the equipment;
the centers of the end surfaces of the two sides of the assembling plate 52 are fixedly provided with anti-falling convex blocks, the two sides of the inner wall of the assembling and disassembling groove 51 are provided with anti-falling grooves, and the anti-falling convex blocks are inserted and arranged in the anti-falling grooves;
one end of the dismounting groove 51 is fixedly provided with a positioning plate 511 through a screw, and the inner side end surface of the positioning plate 511 is in fit connection with one end of the assembly plate 52; the assembling plate 52 can be hermetically arranged in the assembling and disassembling groove 51 through the positioning plate 511, so that the structural stability of the assembling plate 52 is improved;
the circumference of the inner wall of the sleeve 56 is provided with a sealing chute, the circumference of one end of the compression bar 57 is provided with a sealing slide block, and the sealing slide blocks are inserted and installed in the sealing chute;
the energy-absorbing tube 6 is of a metal thin-wall energy-absorbing tube structure, and the energy-absorbing tube 6 can generate folding plastic deformation after being subjected to certain axial load, so that a large amount of collision kinetic energy is consumed, and the purpose of buffering is achieved;
the flame-retardant assembly 3 comprises a flame-retardant box body 31 and buffer rubber 32, wherein the buffer rubber 32 is fixedly arranged at the corner positions around one end of the fixed end frame 1, the flame-retardant box body 31 is fixedly arranged at the center of one end of the fixed end frame 1, and a flame retardant is filled in the flame-retardant box body 31; when collision occurs, after the fixed end frame 1 is deformed, the flame-retardant box body 31 is damaged, and after the flame retardant leaks, the condition of burning and firing can be effectively avoided; the impact is transmitted to the fixed end frame 1, so that the fixed end frame 1 is supported by the buffer rubber 32 and the equipment, and the buffer rubber 32 has good buffer effect;
the energy absorption assembly 8 comprises a crumple frame 82, an anti-collision beam 83 and energy absorption boxes 84, the crumple frame 82 is fixedly arranged on two sides of the center of the end face of the second energy absorption plate 7, the anti-collision beam 83 is fixedly arranged on the outer sides of the two crumple frames 82, and a plurality of energy absorption boxes 84 are fixedly arranged on the end face of the anti-collision beam 83; the airbag assembly 81 is fixedly arranged around the end face of the second energy absorption plate 7, and when collision occurs, energy absorption is carried out through the energy absorption assembly 8, so that impact strength caused by collision is effectively reduced, when the energy absorption box 84 is contacted with a collided object, energy absorption can be supported through deformation of the energy absorption box 84 and the anti-collision beam 83, and when impact is transmitted to the second energy absorption plate 7 through the crumple frame 82, the airbag assembly 81 works, and the airbag assembly 81 can pop up an airbag, so that an energy absorption buffering effect is achieved between the second energy absorption plate 7 and the anti-collision beam 83;
the working principle of the invention is as follows: during installation, the installation clamping plate 2 is connected with equipment through a fastener, so that the fixed end frame 1 and the equipment are installed, and the flame-retardant function can be realized through the flame-retardant component 3; in daily use, the first energy-absorbing plate 4 can be supported through the buffer assembly 5, the second energy-absorbing plate 7 can be supported through the energy-absorbing pipe 6, the second energy-absorbing plate 7 can be used for supporting the energy-absorbing assembly 8, and when collision occurs, impact is transmitted to the second energy-absorbing plate 7 through the energy-absorbing assembly 8 and is transmitted to the energy-absorbing pipe 6 and the first energy-absorbing plate 4 through the second energy-absorbing plate 7, and is transmitted to the buffer assembly 5 through the first energy-absorbing plate 4; when the energy-absorbing box 84 is contacted with a collision object, the energy-absorbing box 84 and the anti-collision beam 83 deform to support and absorb energy, when the impact is transmitted to the second energy-absorbing plate 7 through the crumple frame 82, the air-bag assembly 81 works, the air-bag assembly 81 can pop up the air-bag, the energy-absorbing buffer effect is achieved between the second energy-absorbing plate 7 and the anti-collision beam 83, and when the impact is transmitted to the energy-absorbing tube 6, the energy-absorbing tube 6 generates folding plastic deformation after being subjected to a certain axial load, so that a large amount of collision kinetic energy is consumed, and the buffer purpose is achieved; when the first energy absorption plate 4 is impacted, the impact energy can be transferred to the strong spring 54 and the sleeve 56 through the spring pressing plate 55 and the pressing rod 57 respectively, and when the impact energy is transferred to the strong spring 54 through the spring pressing plate 55, the impact energy can be absorbed through the elastic deformation of the strong spring 54, and meanwhile, when the impact energy is transferred to the sleeve 56 through the pressing rod 57, the guide rod 59 on one side of the fixed chassis 58 pushes the piston 510 to slide with the inner wall of the pressing rod 57, so that air in the pressing rod 57 is compressed, and the buffering effect is achieved; after long-time use, the strong spring 54 is easy to generate elastic fatigue , so that the buffer effect of the strong spring 54 is affected, the positioning plate 511 can be detached from one end of the dismounting groove 51, the assembling plate 52 is moved out of the dismounting groove 51, the strong spring 54 in the spring groove 53 is replaced, after replacement is completed, the assembling plate 52 is reset and installed in the dismounting groove 51, and the positioning plate 511 is installed at one end of the assembling plate 52 in the dismounting groove 51; when the buffer component 5 is compressed, the impact is transmitted to the fixed end frame 1, so that the fixed end frame 1 is supported by the buffer rubber 32 and the equipment, and the buffer rubber 32 has good buffer effect; when the impact is overlarge, after the fixed end frame 1 deforms, the flame-retardant box body 31 is damaged, so that the flame retardant is leaked, and the leaked flame retardant can be effectively prevented from burning and igniting.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (1)
1. The utility model provides an urban rail transit vehicle collision energy-absorbing device, its characterized in that includes fixed end frame (1), fire-retardant subassembly (3), first energy-absorbing board (4), buffer module (5), energy-absorbing pipe (6), second energy-absorbing board (7) and energy-absorbing subassembly (8), the one end of fixed end frame (1) is provided with fire-retardant subassembly (3), the other end outside of fixed end frame (1) is provided with first energy-absorbing board (4), and is provided with buffer module (5) between first energy-absorbing board (4) and fixed end frame (1), the other end fixed mounting of first energy-absorbing board (4) has a plurality of energy-absorbing pipe (6), and the one end fixed mounting of a plurality of energy-absorbing pipe (6) has second energy-absorbing board (7), the outside of second energy-absorbing board (7) is provided with energy-absorbing subassembly (8);
the buffer component (5) comprises a disassembly and assembly groove (51), an assembly plate (52), a spring groove (53), a powerful spring (54), a spring pressing plate (55), a sleeve (56), a pressing rod (57), a fixed bottom frame (58), a guide rod (59) and a piston (510), wherein the disassembly and assembly groove (51) is formed in two sides of the center of the end face of the other end of the fixed end frame (1), the assembly plate (52) is fixedly installed in the disassembly and assembly groove (51), a plurality of spring grooves (53) are formed in the center of the end face of the assembly plate (52), the powerful spring (54) is fixedly installed in the center of the end face of the spring groove (53), the spring pressing plate (55) is fixedly installed at one end of the powerful spring (54), the other end of the spring pressing plate (55) is connected with the first energy absorbing plate (4) in a fitting mode, the sleeves (56) are fixedly installed around the end face of the other end face of the fixed end frame (1), the other end of the sleeve (56) is fixedly connected with the end face of the first energy absorbing plate (4), the guide rod (58) is fixedly installed at one end face of the sleeve (56), one end of the guide rod (59) is inserted and installed in the compression rod (57), a piston (510) is fixedly installed at one end of the guide rod (59), and the piston (510) is in fit connection with the inner wall of the compression rod (57);
the center of the periphery of one end of the fixed end frame (1) is fixedly provided with an installation clamping plate (2) through welding, the installation clamping plate (2) is of an L-shaped structure, and the center of the end face of the installation clamping plate (2) is provided with two positioning holes;
the centers of the end surfaces of the two sides of the assembling plate (52) are fixedly provided with anti-falling convex blocks, the two sides of the inner wall of the assembling and disassembling groove (51) are provided with anti-falling grooves, and the anti-falling convex blocks are inserted and installed in the anti-falling grooves;
one end of the dismounting groove (51) is fixedly provided with a positioning plate (511) through a screw, and the inner side end surface of the positioning plate (511) is in fit connection with one end of the assembly plate (52);
the periphery of the inner wall of the sleeve (56) is provided with a sealing sliding groove, the periphery of one end of the compression bar (57) is provided with a sealing sliding block, and the sealing sliding blocks are inserted and installed in the sealing sliding groove;
the energy absorption tube (6) is of a metal thin-wall energy absorption tube structure;
the flame-retardant assembly (3) comprises a flame-retardant box body (31) and buffer rubber (32), wherein the buffer rubber (32) is fixedly arranged at the corner position around one end of the fixed end frame (1), and the flame-retardant box body (31) is fixedly arranged at the center of one end of the fixed end frame (1);
the flame retardant box body (31) is internally filled with a flame retardant;
the energy absorption assembly (8) comprises a crumple frame (82), an anti-collision beam (83) and energy absorption boxes (84), the crumple frames (82) are fixedly arranged on two sides of the center of the end face of the second energy absorption plate (7), the anti-collision beam (83) is fixedly arranged on the outer sides of the two crumple frames (82), and a plurality of energy absorption boxes (84) are fixedly arranged on the end face of the anti-collision beam (83);
and the periphery of the end face of the second energy absorption plate (7) is fixedly provided with an airbag assembly (81).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111512872.2A CN114148367B (en) | 2021-12-11 | 2021-12-11 | Urban rail transit vehicle collision energy-absorbing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111512872.2A CN114148367B (en) | 2021-12-11 | 2021-12-11 | Urban rail transit vehicle collision energy-absorbing device |
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| CN114148367A CN114148367A (en) | 2022-03-08 |
| CN114148367B true CN114148367B (en) | 2023-06-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105172720B (en) * | 2015-09-09 | 2017-05-31 | 安徽工程大学 | A kind of automobile bumper device of multi-buffer |
| CN206306981U (en) * | 2016-11-29 | 2017-07-07 | 深圳市五洲龙汽车股份有限公司 | A kind of collision prevention girders used for electric vehicle |
| US10279765B2 (en) * | 2017-03-06 | 2019-05-07 | Qiusheng Gao | Safe protection equipment for all vehicles and drivers from both front and rear |
| CN207683474U (en) * | 2017-12-01 | 2018-08-03 | 江苏安德福运输实业有限公司 | A kind of harmful influence haulage vehicle rear lower anticollision gear |
| CN110576813A (en) * | 2019-09-04 | 2019-12-17 | 河南省全能科技有限公司 | Effectual car bumper of shock attenuation |
| CN110803307A (en) * | 2019-11-21 | 2020-02-18 | 深圳市乾行达科技有限公司 | Multi-stage landing buffering energy-absorbing device |
| CN211032474U (en) * | 2019-11-29 | 2020-07-17 | 江苏锐新汽配有限公司 | Automobile bumper with energy absorption structure |
| CN112977524B (en) * | 2019-12-16 | 2022-08-30 | 中车唐山机车车辆有限公司 | Rail vehicle and vehicle end energy absorption structure thereof |
| CN211107294U (en) * | 2019-12-23 | 2020-07-28 | 常州嘉奕运输有限公司 | Lower part anticollision device behind dangerization article haulage vehicle |
| WO2021157803A1 (en) * | 2020-02-03 | 2021-08-12 | 이일현 | Vehicle collision impact-absorbing device |
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