CN212332588U

CN212332588U - Trigger is lifted to automobile front shroud

Info

Publication number: CN212332588U
Application number: CN202020555492.1U
Authority: CN
Inventors: 刘忠; 冉启权; 耿会角; 李卫
Original assignee: Hebei Dongfang Ruifeng Automobile Safety Component Co ltd
Current assignee: Hebei Dongfang Ruifeng Automobile Safety Component Co ltd
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2021-01-12
Anticipated expiration: 2030-04-15

Abstract

The utility model discloses an automobile front shroud uplifting trigger, which comprises an ignition mechanism, a gas production drug, a shell, a piston rod and a piston cylinder; the gas producing medicine is a long-strip medicine bag and is positioned at the middle lower part of the shell; the ignition mechanism is positioned at the lower part of the gas producing medicine; the piston rod is positioned above the gas producing medicine; the piston cylinder is of a cylindrical structure with openings at two ends, is positioned in the shell and is sleeved on the piston rod and the outer side of the gas producing medicine; the lower end of the piston cylinder is provided with an annular bulge, and the inner side of the upper end of the shell is provided with a piston cylinder limiting fixture block matched with the annular bulge on the piston cylinder; the lower end of the piston rod is provided with an annular bulge, and the inner side of the upper end of the piston cylinder is provided with a piston rod limiting fixture block matched with the bulge on the piston rod; the upper opening of the shell can accommodate the piston rod and the piston cylinder to extend out. The utility model has the characteristics of simple structure, few, the small size of material, release speed are fast, the release is steady etc to can improve the height of lifting up of automobile front shroud effectively.

Description

Trigger is lifted to automobile front shroud

Technical Field

The utility model relates to a trigger, especially a trigger is lifted to car shroud.

Background

With the increasing number of automobiles, traffic accidents are increasing day by day, and in all accident types, the accident of colliding people becomes a key point of social attention because of the fatal injury of the weak people caused by the strong people. How to reduce the damage to the human body in the accidents becomes a research hotspot. At present, a mainstream method for strengthening the protection of pedestrians from the perspective of an automobile is to lift the rear part (part close to a windshield wiper) of an automobile engine cover to a designed height at the initial stage of an accident so as to buffer the collision force between a human body and the engine cover when the human body falls on the engine cover, thereby reducing the injury to the human body. The design is that a hinge is additionally arranged between an engine cover and a trigger, a controller (ECU) of an automobile is utilized for prejudging, and when the controller (ECU) prejudges that frontal collision between the automobile and pedestrians is about to occur or detected and the pedestrians are injured to a certain degree. The controller (ECU) can rapidly send out ignition electric pulses to explode the trigger under the engine hood, and a piston rod of the trigger extends out instantly to push the hinge of the engine hood to a designed position so as to lift the engine hood of the automobile to a required height. When the head or body of a pedestrian impacts the engine hood of the automobile, the huge pressure causes the exhaust and pressure relief mechanism of the trigger to accelerate the exhaust of gas in the trigger, the engine hood is displaced, the acting force time of the human body and the engine hood is prolonged, and the impulse is reduced, so that the injury of the collision to the pedestrian is reduced, and the purpose of protecting the pedestrian in the primary frontal collision process is finally achieved. However, the trigger product on the market is of a single-piston-rod structure, and the trigger product mainly comprises a wire harness, a fixed support, an igniter, an injection molding body, gas-generating drug particles, a gas-generating drug cartridge, a filtering structure, a piston rod, a sealing ring, a shell, a metal end cover, a plastic end cap and the like. The structure of this kind of trigger is complicated, bulky, and because piston rod length is limited, the automobile front shroud is limited by the compression when the pedestrian pushes down for cushioning effect is weakened greatly, can't effectively ensure pedestrian's safety.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a simple structure, make the car shroud lift up the high trigger that lifts up of car shroud.

In order to solve the technical problem, the utility model discloses the technical scheme who takes is:

a lifting trigger for a front cover of an automobile comprises an ignition mechanism, a gas generating agent, a shell, a piston rod and a piston cylinder; the gas producing medicine is a long-strip medicine bag and is positioned at the middle lower part of the shell; the ignition mechanism is positioned at the lower part of the gas producing medicine; the piston rod is positioned above the gas producing medicine; the piston cylinder is of a cylindrical structure with openings at two ends, is positioned in the shell and is sleeved on the piston rod and the outer side of the gas producing medicine; the lower end of the piston cylinder is provided with an annular bulge, and the inner side of the upper end of the shell is provided with a piston cylinder limiting fixture block matched with the annular bulge on the piston cylinder; the lower end of the piston rod is provided with an annular bulge, and the inner side of the upper end of the piston cylinder is provided with a piston rod limiting fixture block matched with the annular bulge on the piston rod; the upper opening of the shell can accommodate the piston rod and the piston cylinder to extend out.

The automobile front cover lifts up the trigger, and the upper end of a gap between the piston cylinder and the shell is further provided with a sealing ring.

In the automobile front cover lifting trigger, the lower end of the gap between the piston rod and the piston cylinder is also provided with an O-shaped sealing ring.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the utility model discloses a mode of using piston rod and piston cylinder simultaneously is keeping under the circumstances of whole smaller size for the automobile front shroud lifts up highly higher, has effectively guaranteed to be hit pedestrian's safety. And the utility model discloses a rectangular cartridge bag can accurate control burning rate for the application of force of trigger is more steady. The utility model has the characteristics of simple structure, small size, fast release speed, stable release and the like, and can effectively improve the lifting height of the front cover cap of the automobile.

The utility model discloses still add sealing washer and O type sealing washer, guarantee holistic gas tightness requirement. The effectiveness of the trigger is effectively improved, and the device failure caused by poor air tightness is avoided.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of the present invention.

The reference numerals in the figures denote: 1. an ignition mechanism; 2. a gas producing drug; 3. a housing; 4. a piston rod; 5. a plastic end cap; 6. a seal ring; 7. a piston cylinder; 8. an O-shaped sealing ring; 9. fixing a bracket; 10. a piston rod limiting clamping block; 11. and a piston cylinder limiting clamping block.

Detailed Description

In the present invention, the "up" indicates that the moving direction of the piston rod 4 is up, and the reverse direction of the movement of the piston rod 4 is down.

Referring to fig. 1, the utility model discloses an ignition 1, produce gas medicine 2, shell 3, piston rod 4, plastics end cap 5, piston cylinder 7, fixed bolster 9 and plastics end cap 5. The shell 3 is of a cylindrical structure with openings at two ends, and the upper opening can accommodate the piston rod 4 and the piston cylinder 7 to extend out; the plastic end cap 5 is buckled on the upper part of the shell 3 and used for covering the opening to prevent the performance from being influenced by oil inlet and water inlet. The plastic end cap 5 is in contact with the front cover of the automobile and is used for jacking the engine cover of the automobile. The gas producing medicine 2 is positioned at the middle lower part of the shell 3 and consists of energetic pyrotechnic compositions; the gas production medicine 2 is a strip-shaped medicine bag, and the strip-shaped medicine bag is more stable and reliable in combustion. The ignition mechanism 1 is positioned at the lower part of the gas producing medicine 2 and is fixed at the bottom of the shell 3; the ignition mechanism 1 comprises a wire harness, an ignition tool seat, a thermosensitive material and pyrotechnic composition. The piston rod 4 is of a cylindrical structure and is positioned above the gas producing drug 2, and the lower part of the piston rod 4 is of an arc shape which is sunken inwards and used for increasing the contact area of nontoxic harmless high-temperature gas generated by the gas producing drug 2. The piston cylinder 7 is of a cylindrical structure with two open ends, is positioned in the shell 3 and is sleeved outside the piston rod 4 and the gas production drug 2. An outward annular bulge is arranged on the outer side of the lower end of the piston cylinder 7; and an annular piston cylinder limiting clamping block 11 matched with the annular bulge on the piston cylinder 7 is arranged on the inner side of the upper end of the shell 3. The lower end of the piston rod 4 is also provided with an annular bulge; and an annular piston rod limiting clamping block 10 matched with the annular bulge on the piston rod 4 is arranged on the inner side of the upper end of the piston cylinder 7. After adopting above-mentioned structure: when the automobile and pedestrian front collision accident happens, the system ECU sends an ignition signal to the igniter through the wire harness to ignite the igniter, then the igniter ignites the gas generating agent 2, and the gas generating agent 2 generates nontoxic and harmless high-temperature gas. The piston rod 4 extends outwards under the pushing of nontoxic and harmless high-temperature gas until the annular bulge at the lower part of the piston rod 4 is clamped by the annular piston rod limiting clamping block 10; the piston cylinder 7 is driven by the piston rod 4 to extend outwards continuously until the piston cylinder 7 is clamped by the annular piston cylinder limiting clamping block 11. At this time, the plastic end cap 5 is pushed by the piston rod 4 and the piston cylinder 7 to rise to the maximum liftable position. In the process, the piston rod 4 jacks up the automobile engine cover to quickly lift up the automobile engine cover.

The utility model discloses in fixed bolster 9 is established in the both sides of shell 3 for fixed trigger body and connection protecgulum system.

In the utility model, a sealing ring 6 is also sleeved on the piston cylinder 7; the sealing ring 6 is sleeved at the upper end of the annular piston cylinder limiting clamping block 11 and matched with the annular bulge on the piston cylinder 7 to ensure the air tightness between the shell 3 and the piston cylinder 7.

The utility model discloses in it has O type sealing washer 8 still to overlap on piston rod 4, 8 covers in the terminal annular bulge upper end of piston rod 4 of O type sealing washer, and the spacing fixture block 10 of the cyclic annular piston rod of cooperation is used for guaranteeing the gas tightness between piston rod 4 and the piston cylinder 7.

The utility model discloses a trigger the process as follows: the automobile pedestrian front collision protection system ECU sends an ignition signal to the igniter through the wire harness to ignite the igniter, then the igniter ignites the gas producing medicament 2, and the gas producing medicament 2 generates nontoxic harmless high-temperature gas. The piston rod 4 is pushed by nontoxic and harmless high-temperature gas to simultaneously extend outwards until the lower end protrusion of the piston rod 4 is clamped by the annular piston rod limiting clamping block 10, and the piston cylinder 7 continues to extend outwards under the driving of the piston rod 4 until the piston cylinder 7 is also clamped by the annular piston cylinder limiting clamping block 11. In the process, the piston rod 4 jacks up the automobile engine cover, so that the automobile engine cover is quickly jacked up. At this moment, the pedestrian pushes down the automobile front shroud when contacting with the automobile front shroud, the piston cylinder 7 and the piston rod 4 are pushed down simultaneously, and the shell is compressed with the gas in the piston cylinder, thereby generating certain buffering and further realizing the buffering protection of the collided pedestrian.

Claims

1. The utility model provides a trigger is lifted to car front shroud which characterized in that: comprises an ignition mechanism (1), a gas producing medicine (2), a shell (3), a piston rod (4) and a piston cylinder (7); the gas production medicine (2) is a long-strip medicine bag and is positioned at the middle lower part of the shell (3); the ignition mechanism (1) is positioned at the lower part of the gas producing medicine (2); the piston rod (4) is positioned above the gas producing medicine (2); the piston cylinder (7) is of a cylindrical structure with openings at two ends, is positioned in the shell (3) and is sleeved outside the piston rod (4) and the gas production medicine (2); the lower end of the piston cylinder (7) is provided with an annular bulge, and the inner side of the upper end of the shell (3) is provided with a piston cylinder limiting clamping block (11) matched with the annular bulge on the piston cylinder (7); the lower end of the piston rod (4) is provided with an annular bulge, and the inner side of the upper end of the piston cylinder (7) is provided with a piston rod limiting clamping block (10) matched with the annular bulge on the piston rod (4); the upper opening of the shell (3) can accommodate the piston rod (4) and the piston cylinder (7) to extend out.

2. The automotive front cover lift trigger of claim 1, characterized in that: and a sealing ring (6) is also arranged at the upper end of a gap between the piston cylinder (7) and the shell (3).

3. The automobile front cover lift trigger according to claim 1 or 2, characterized in that: and an O-shaped sealing ring (8) is further arranged at the lower end of the gap between the piston rod (4) and the piston cylinder (7).