CN111674352B - Trigger of automatic lifting system of automobile front cover - Google Patents
Trigger of automatic lifting system of automobile front cover Download PDFInfo
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- CN111674352B CN111674352B CN202010294824.XA CN202010294824A CN111674352B CN 111674352 B CN111674352 B CN 111674352B CN 202010294824 A CN202010294824 A CN 202010294824A CN 111674352 B CN111674352 B CN 111674352B
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- piston rod
- gas production
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- trigger
- support cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/34—Protecting non-occupants of a vehicle, e.g. pedestrians
- B60R21/38—Protecting non-occupants of a vehicle, e.g. pedestrians using means for lifting bonnets
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Abstract
The invention discloses a trigger of an automatic lifting system of an automobile front cover, which has the structure that: the gas production device comprises an ignition mechanism, a gas production medicine box, a support cylinder, a piston rod and a gas production medicine; an ignition mechanism is arranged at the inner lower end of the supporting cylinder, a gas production medicine box is arranged at the upper end of the ignition mechanism, and gas production medicine is contained in the gas production medicine box; the ignition mechanism is controlled by an automobile ECU; the upper end of the gas production medicine box is provided with a piston rod, the upper part of the support cylinder is opened and can accommodate the piston rod to extend out, and the upper side part of the support cylinder is provided with an exhaust hole which penetrates through the support cylinder; the piston rod is of a hollow structure with a closed lower end, a spring is arranged at the inner lower end of the piston rod, and an ejector rod is arranged at the upper end of the spring; the top rod and the piston rod are provided with limiting holes, and magnetic limiting columns for limiting the spring to bounce are arranged in the limiting holes; an electromagnetic force device capable of sucking the magnetic limiting column outwards is arranged outside the supporting cylinder; the electromagnetic force device is controlled by an automobile ECU. The trigger can effectively improve the protection and the safety, and has simple structure and low cost.
Description
Technical Field
The invention relates to the technical field of automobile safety, in particular to a trigger of an automatic lifting system of an automobile front cover.
Background
The automobile safety technology is an important subject of research in the automobile field, and if an automobile collides with a pedestrian in the driving process, the head of the pedestrian is easy to directly and rigidly collide with an automobile engine hood to cause head injury. In order to effectively prevent the head of a pedestrian from rigidly colliding with the engine hood of an automobile, some current automobile models are provided with a bouncing device in the engine hood, and when the collision occurs, the head of the pedestrian elastically collides with the engine hood by bouncing the engine hood of the automobile.
The active safety protection system for the pedestrian collided with the front side of the automobile mainly comprises two types, the first type is that an air bag is additionally arranged at the front cover and the front windshield of the automobile for protecting the pedestrian, and the detailed description is not provided. The second is to lift the rear part (close to the wiper part) of the automobile front cover to the designed height instantly to achieve the purpose of buffering the collision force between the human body and the front cover when the human body falls on the front cover, thereby reducing the head injury of the collided person. The second type of front impact pedestrian protection system generally consists of a controller (ECU) system, a hinge system, an Actuator (Actuator) system, a front hood of an automobile, and the like. The main working principle of the protection system is as follows: when the ECU prejudges that the automobile is about to have a first serious frontal collision with a pedestrian, the ECU can rapidly send an ignition current pulse to immediately ignite a trigger system under the automobile front cover, a piston rod of the trigger instantly extends out and lifts the automobile front cover to a designed height so that the automobile front cover forms a required buffer space, and the head of the collided pedestrian collides the automobile front cover to generate huge pressure to promote a trigger exhaust and pressure release mechanism to rapidly exhaust gas generated after the action of the trigger and deform the front cover to absorb collision energy, so that the injury of the collided pedestrian is reduced.
The trigger in the current market generally utilizes gunpowder to generate thrust to push a piston rod structure, and the structure of the trigger mainly comprises a wire harness, a fixed support, a bar code label, an igniter, an injection molding body, gas generation medicine particles, a gas generation medicine cylinder, a filtering structure, a piston rod, a sealing ring, a shell, a metal end cover, a plastic end cap and the like, wherein the wire harness, the fixed support, the bar code label, the igniter, the injection molding body, the gas generation medicine particles, the gas generation medicine cylinder, the filtering structure, the piston rod, the sealing ring, the shell, the metal end cover and the plastic end cap are connected with the whole vehicle. Because pedestrian and bonnet collision time are very short, tens of milliseconds usually, the current trigger still exists and pops up the not enough that is slow relatively, and the pressure release curve of pressure release mechanism that exhausts is more straight moreover, can't be in pedestrian and bonnet collision's the more quick pressure release in the twinkling of an eye, causes its buffering effect in the twinkling of an eye relatively poor, and factor of safety is lower.
Disclosure of Invention
The invention aims to provide a trigger of an automatic lifting system of an automobile front cover, which has the advantages of quick bounce and good buffering effect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the gas production device comprises an ignition mechanism, a gas production medicine box, a support cylinder, a piston rod and a gas production medicine; an ignition mechanism is arranged at the inner lower end of the supporting cylinder, a gas production medicine box is arranged at the upper end of the ignition mechanism, and gas production medicine is contained in the gas production medicine box; the ignition mechanism is controlled by an automobile ECU; the upper end of the gas production medicine box is provided with a piston rod, the upper part of the support cylinder is opened and can accommodate the piston rod to extend out, and the upper side part of the support cylinder is provided with an exhaust hole which penetrates through the support cylinder; the piston rod is of a hollow structure with a closed lower end, a spring is arranged at the inner lower end of the piston rod, and an ejector rod is arranged at the upper end of the spring; the top rod and the piston rod are provided with limiting holes, and magnetic limiting columns for limiting the spring to bounce are arranged in the limiting holes; an electromagnetic force device capable of attracting the magnetic limiting column outwards is arranged outside the supporting cylinder; the electromagnetic force device is controlled by an automobile ECU.
The upper side part of the supporting cylinder is provided with an exhaust hole which penetrates through the supporting cylinder, and an exhaust groove is arranged below the exhaust hole. The exhaust groove is arranged in an outward inclined mode from bottom to top through the inner wall of the supporting cylinder.
A piston rod baffle ring is arranged at the opening at the top of the supporting cylinder, and a mandril baffle ring is arranged at the opening at the top of the piston rod.
The ignition mechanism of the invention is composed of a wire harness, an igniter seat, a short circuit ring, a thermosensitive material and pyrotechnic compositions.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the double-lifting structure can quickly bounce the automobile front cover cap by adopting gunpowder to push the piston rod and the spring to bounce the ejector rod, so that the automobile front cover cap can bounce to the highest point before the automobile front cover cap collides with a pedestrian, the collision moment of the pedestrian with the front cover cap can be buffered, the situation that the front cover cap still rises at the moment of the collision of the pedestrian with the front cover cap is avoided, the use is safer, and the protection is stronger. When a pedestrian collides with the front cover, the air exhaust hole exhausts air to buffer the piston rod, and the spring buffers the ejector rod, so that the double-buffer structure can better absorb the impact energy of the head of the pedestrian, realize more effective buffering for the pedestrian, and has better protectiveness and safety. The active safety protection system adopts a double-bounce and double-buffer structure, can effectively improve the protection and the safety of the active safety protection system for pedestrians when the automobile collides with the front face, and has simple structure and low manufacturing cost; due to the adoption of the double-bounce structure, the size can be smaller, and the use and the installation are easier.
The invention adopts the design of the exhaust groove, particularly adopts the exhaust groove which is obliquely arranged, so that a curve structure with quick start and subsequent slow down is formed in the air leakage process, the buffer effect of the piston rod is better, and the protection and the safety of the trigger can be further improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of the structure of the vent groove according to the present invention;
FIG. 3 is a schematic view of another embodiment of the vent slot of the present invention.
In the figure: the gas production device comprises a plastic cap 1, a piston rod baffle ring 2, a mandril baffle ring 3, an exhaust hole 4, an exhaust groove 5, a mandril 6, a magnetic limiting column 7, an electromagnetic force device 8, a limiting hole 9, a supporting cylinder 10, a mandril sealing ring 11, a spring 12, a piston rod 13, a piston rod sealing ring 14, a gas production drug 15, a gas production drug box 16, an igniter 17, an igniter base 18 and a wire harness 19.
Detailed Description
As shown in fig. 1, the trigger of the automatic lifting system for the automobile front cover comprises an ignition mechanism, a gas generation medicine box 16, a gas generation medicine 15, a support cylinder 10, a piston rod 13 and a push rod 6. The supporting cylinder 10 is of a cylindrical structure, and an ignition mechanism is arranged at the inner lower end of the supporting cylinder 10; the ignition mechanism comprises an igniter 17 and an igniter seat 18, and the igniter seat 18 is fixed at the lower end of the supporting cylinder 10 so as to support and fix the igniter 17 positioned thereon; the ignition tool 17 is internally provided with a thermosensitive material, pyrotechnic composition and a short-circuit ring, the short-circuit ring extends out of the ignition tool seat through a wiring harness 19, and the wiring harness 19 is connected with an ECU (electronic control unit) of a pedestrian front collision protection system of an automobile. The upper end of the igniter 17 is provided with a gas generating medicine box 16, the gas generating medicine box 16 is filled with a gas generating medicine 15, and the gas generating medicine 15 can be ignited by the igniter 17 to generate a large amount of gas. The gas generating agent 15 is pyrotechnic composition, and mainly comprises guanidine nitrate, nitroguanidine, pentaamino tetrazole, basic copper nitrate, potassium nitrate, ethyl cellulose and calcium stearate. After adopting such a structure, when a pedestrian frontal collision occurs, the automobile pedestrian frontal collision protection system ECU sends an ignition signal to the igniter 17 through the wire harness 19 to ignite the igniter, and the gas generating agent 15 is ignited by the igniter 17 to rapidly generate a large amount of nontoxic and harmless gas.
As shown in fig. 1, a piston rod 13 is disposed at the upper end of a gas generating medicine box 16 of the trigger of the automatic lifting system for the front cover of the automobile, and the upper portion of a support cylinder 10 is opened and can accommodate the piston rod 13 to extend out; a piston rod baffle ring 2 is arranged at the opening at the top of the supporting cylinder 10 and is used for preventing the piston rod 13 from completely flying out; a piston rod packing 14 is provided between the piston rod 13 and the support cylinder 10 for ensuring airtightness therebetween. Thus, the piston rod 13 can be rapidly sprung upward by the thrust of the gas generated by the gas generating composition 15. The upper side part of the supporting cylinder 10 is provided with an exhaust hole 4 which penetrates through the supporting cylinder, and the height position of the exhaust hole 4 is positioned below the piston rod 13 after being completely bounced; an exhaust groove 5 is formed below the exhaust hole 4, and the exhaust groove 5 has a structure with a deep upper end and a shallow lower end as shown in fig. 1 and 2, or has a structure with a wide upper end and a narrow lower end as shown in fig. 3, or has a structure with a deep upper end and a wide upper end and a shallow lower end; thus, when the piston rod 13 is pressed down, the gas generated by the gas generating agent (hereinafter referred to as gas generation) can be exhausted from the exhaust hole 4 through the exhaust groove 5; because the upper and lower depths (widths) of the exhaust groove 5 are different, the exhaust speed of the exhaust groove 5 and the exhaust hole 4 is slower as the piston rod 13 is pressed downwards, so that an air leakage curve which is fast in starting and becomes slower subsequently is formed.
As shown in fig. 1, the piston rod 13 of the trigger of the automatic lifting system for the front cover of the automobile is a hollow structure with a closed lower end and an open upper end, and the hollow structure is preferably a circular cylinder; a mandril 6 is arranged in the hollow structure, and a mandril retaining ring 3 is arranged at the opening at the top of the piston rod 13 and is used for preventing the mandril 6 from flying out completely; a spring 12 is arranged between the lower end of the ejector rod 6 and the piston rod 13, a limiting hole 9 is formed in the relative position of the outer side of the ejector rod 6 and the inner side of the piston rod 13, and a magnetic limiting column 7 capable of sliding in the limiting hole is arranged in the limiting hole 9; the limiting hole 9 and the magnetic limiting column 7 are used for compressing and limiting the spring 12. And an electromagnetic force device 8 capable of sucking the magnetic limiting column 7 outwards is arranged outside the supporting cylinder 10, and the electromagnetic force device 8 is controlled by an automobile and pedestrian frontal collision protection system ECU. The upper end of the supporting cylinder 10 is covered with a plastic cap 1 for covering the supporting cylinder 10, the piston rod 13 and the push rod 6. After the structure is adopted, when the pedestrian head-on collision occurs, the ECU of the automobile pedestrian head-on collision protection system sends a signal to enable the electromagnetic force device 8 to generate magnetic force, and the magnetic limiting column 7 is sucked out outwards to enable the ejector rod 6 and the piston rod 12 to be removed from the limit; the spring 12 in a compressed state springs up, thereby pushing the jack 6 to spring up quickly.
As shown in fig. 1, the trigger of the automatic lifting system for a front hood of an automobile is triggered as follows: (1) When the pedestrian is in frontal collision, the ECU of the automobile pedestrian frontal collision protection system sends an ignition signal to the igniter through the wiring harness 19 to ignite the igniter 17, and the gas generating agent 15 is ignited by the igniter to rapidly generate a large amount of gas; meanwhile, the ECU sends a signal to control the electromagnetic force device 8 to generate magnetic force, and the magnetic limiting column 7 is sucked out outwards to enable the ejector rod 6 and the piston rod 13 to be free from limiting.
(2) A large amount of gas is generated to push the piston rod 13 to bounce upwards quickly; meanwhile, the spring 12 which is separated from the limit is quickly bounced to push the ejector rod 6 to be quickly bounced upwards, and the bounced ejector rod 6 pushes the front cover of the automobile upwards. The gas production medicine and the spring are adopted for double pushing, so that the bouncing speed of the automobile front cover can be higher; so as to prevent the head of the pedestrian from colliding with the front cover of the automobile, and the front cover of the automobile does not rise to the highest position.
(3) The ejector rod 6 and the piston rod 13 which are completely bounced push the automobile front cover to rise to the highest position, and the exhaust groove 5 and the exhaust hole 4 start to discharge gas outwards; when the head of the collided pedestrian contacts with the front cover of the automobile, the front cover of the automobile is pressed down, the leaked gas generates buffer on the piston rod 13, and meanwhile, the spring 12 also generates buffer under the lower pressure; the double buffering of utilizing exhaust hole and spring can more effectively unload pedestrian's head impact energy, protects the pedestrian more effectively.
Claims (4)
1. The utility model provides a trigger of automatic lifting system of automobile front shroud which characterized in that: the gas production device comprises an ignition mechanism, a gas production medicine box (16), a support cylinder (10), a piston rod (13) and a gas production medicine (15); an ignition mechanism is arranged at the inner lower end of the support cylinder (10), a gas production medicine box (16) is arranged at the upper end of the ignition mechanism, and gas production medicines (15) are contained in the gas production medicine box (16); the ignition mechanism is controlled by an automobile ECU; the upper end of the gas production medicine box (16) is provided with a piston rod (13), the upper part of the support cylinder (10) is opened and can accommodate the piston rod (13) to extend out, and the upper side part of the support cylinder (10) is provided with an exhaust hole (4) which penetrates through the support cylinder; an exhaust groove (5) is arranged below the exhaust hole (4); the piston rod (13) is of a hollow structure with a closed lower end, a spring (12) is arranged at the inner lower end of the piston rod (13), and an ejector rod (6) is arranged at the upper end of the spring (12); the top rod (6) and the piston rod (13) are provided with limit holes (9), and magnetic limit columns (7) for limiting the spring (12) to bounce are arranged in the limit holes (9); an electromagnetic force device (8) capable of attracting the magnetic limiting column (7) outwards is arranged outside the supporting cylinder (10); the electromagnetic force device (8) is controlled by an automobile ECU.
2. The trigger of an automatic lifting system for the front hood of a vehicle according to claim 1, wherein: the exhaust groove (5) is obliquely arranged outwards from bottom to top by the inner wall of the supporting cylinder.
3. The trigger of an automatic lifting system for the front hood of a vehicle according to claim 1, wherein: the top opening of the supporting cylinder (10) is provided with a piston rod baffle ring (2), and the top opening of the piston rod is provided with a mandril baffle ring (3).
4. The trigger of the automatic lifting system for the front cover of the automobile as claimed in any one of claims 1 to 3, wherein: the ignition mechanism is composed of a wire harness (19), an ignition tool (17), an ignition tool seat (18), a short circuit ring, a thermosensitive material and pyrotechnic compositions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010294824.XA CN111674352B (en) | 2020-04-15 | 2020-04-15 | Trigger of automatic lifting system of automobile front cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010294824.XA CN111674352B (en) | 2020-04-15 | 2020-04-15 | Trigger of automatic lifting system of automobile front cover |
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| Publication Number | Publication Date |
|---|---|
| CN111674352A CN111674352A (en) | 2020-09-18 |
| CN111674352B true CN111674352B (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010294824.XA Active CN111674352B (en) | 2020-04-15 | 2020-04-15 | Trigger of automatic lifting system of automobile front cover |
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| CN (1) | CN111674352B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112124246B (en) * | 2020-09-27 | 2021-12-28 | 均胜汽车安全系统(湖州)有限公司 | Pyrotechnic automobile engine hood bouncing device |
| CN112459627A (en) * | 2020-10-22 | 2021-03-09 | 奇瑞汽车股份有限公司 | Automobile emergency unlocking system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004037060A1 (en) * | 2004-07-30 | 2006-03-23 | Trw Automotive Gmbh | Actuating drive for device for raising of engine bonnet of motor vehicle has control unit which automatically triggers return movement of actuating component back into initial position |
| DE102016123460A1 (en) * | 2016-12-05 | 2018-06-07 | Stabilus Gmbh | Piston-cylinder unit |
| FR3063527B1 (en) * | 2017-03-06 | 2019-04-05 | Safran Electronics & Defense | INTEGRATED LOCKING VERIN |
| CN206826759U (en) * | 2017-05-16 | 2018-01-02 | 百利得(湖州)汽车安全系统有限公司 | A kind of automatic bounce device of pyrotechnic automobile engine cover |
| CN212332586U (en) * | 2020-04-15 | 2021-01-12 | 河北东方久乐瑞丰汽车安全部件有限公司 | Automatic lifting trigger for automobile front cover |
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2020
- 2020-04-15 CN CN202010294824.XA patent/CN111674352B/en active Active
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| CN111674352A (en) | 2020-09-18 |
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