CN114312653B

CN114312653B - Primer for automobile engine cover

Info

Publication number: CN114312653B
Application number: CN202111564513.1A
Authority: CN
Inventors: 廖续峰; 邬达文
Original assignee: Junsheng Junan Automotive Electronics Shanghai Co ltd
Current assignee: Junsheng Junan Automotive Electronics Shanghai Co ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2023-05-05
Anticipated expiration: 2041-12-20
Also published as: CN114312653A

Abstract

The application provides an exploder of automobile engine lid belongs to the technical field that the car protected the pedestrian, specifically includes sleeve pipe, piston rod and generator, the generator is fixed the sleeve pipe bottom, the piston rod is located in the sleeve pipe, the sleeve pipe top is equipped with the export, the generator actuation, the drive the piston rod is followed the exit is ejecting, the sleeve pipe is close to be equipped with on the body of export to the annular that the sleeve pipe is inboard sunken, be equipped with the cutting ferrule on the annular is equipped with the inserts on the annular periphery, the annular arch of piston rod bottom is passed through when the annular, with annular and/or inserts interact reduces the piston rod is ejecting the sleeve pipe energy. Through the processing scheme of this application, reduce the kinetic energy when piston rod flies out the sleeve pipe.

Description

Primer for automobile engine cover

Technical Field

The present application relates to the field of pedestrian protection in automobiles, and in particular to an initiator for an automobile hood.

Background

The initiator of the automobile engine cover is arranged on the sheet metal of the automobile body of the engine cabin, and at the moment of collision between a pedestrian and the automobile, the initiator can jack up the engine cover hinge to enable the rear end of the engine cover to be lifted to a certain height, so that a certain crumple space exists when the head of the pedestrian impacts the engine cover, and the pedestrian is protected.

The existing detonators, such as MGG with large explosive quantity (the powder of NA251 is more than 275 mg), have the defects of insufficient structural strength due to the fact that the top in the tube has energy limitation of R angle only, and the strong pressure generated after the MGG is detonated easily causes the inner piston rod to fly out of the tube body. In particular, when the detonator is in fire disaster during storage and transportation, the piston rod flies out of the pipe body after the detonator is accidentally detonated, and personnel injury or property loss is easily caused.

Disclosure of Invention

In view of this, the application provides an initiator of automobile engine hood, has solved the problem among the prior art, reduces the kinetic energy when piston rod flies out the sleeve pipe.

The application provides an initiator of car bonnet adopts following technical scheme:

the utility model provides an automobile engine hood's initiator, includes sleeve pipe, piston rod and generator, the generator is fixed the sleeve pipe bottom, the piston rod is located the sleeve pipe is intraductal, the sleeve pipe top is equipped with the export, the generator actuates, and the drive the piston rod is followed the exit is ejecting, the sleeve pipe is close to be equipped with on the body of export towards the inboard sunken annular of sleeve pipe, be equipped with the cutting ferrule on the annular is in inserts on the annular periphery, the annular of piston rod bottom is protruding when passing through the annular, with the annular and/or inserts interact reduces the piston rod is ejecting the sleeve pipe energy.

Optionally, the sleeve is fixed on the sleeve, the sleeve is of a rigid structure, and the inner wall of the sleeve abuts against the insert and the outer wall of the sleeve.

Optionally, the top of the sleeve is narrowed to form a through hole and sleeved on the top of the sleeve, and the diameter of the through hole is larger than or equal to that of the outlet.

Optionally, the anti-dust device further comprises a dust cap, wherein the dust cap is fixed on the sleeve, the top end of the through hole is sealed, the dust cap is at least partially embedded into the through hole, and a caulking groove for embedding the top of the piston rod is formed in the bottom of the dust cap.

Optionally, the dust cap is in be equipped with annular draw-in groove and annular lug in the outer wall circumference of caulking groove, the piston rod embedding when the caulking groove, the edge of export and/or through-hole is passed through in the annular lug back slide into in the annular draw-in groove, just the dust cap with sleeve, piston rod and sleeve pipe interference fit.

Optionally, the mounting bracket further comprises a mounting bracket, the mounting bracket comprises a connecting portion and a flange portion, the connecting portion is sleeved and fixed on the sleeve, the flange portion extends from the connecting portion to the outer side of the sleeve and is used for connecting the initiator with a vehicle body, and the inner wall of the connecting portion is abutted against the insert and the outer wall of the sleeve.

Optionally, the flange portion is flush with the sleeve top.

Optionally, the insert is a rigid split snap ring.

Optionally, the cross section of the open snap ring is rectangular, and the inner contour surface of the longer side of the open snap ring is attached to the bottom wall of the ring groove.

Optionally, the insert is a plurality of balls surrounding the annular groove.

In summary, the present application includes the following beneficial technical effects:

1. when the annular bulge at the bottom of the piston rod passes through the annular groove, the annular bulge interacts with the annular groove and/or the insert, so that the energy of the ejection sleeve of the piston rod is reduced, the kinetic energy of the piston rod is reduced, and the speed of the bottom of the piston rod reaching the outlet position is reduced;

2. the inner wall of the sleeve is abutted against the insert and the outer wall of the sleeve, when the bottom of the piston rod passes through the annular groove, the insert transmits acting force of the bottom of the piston rod to the annular groove to the sleeve, the sleeve is restrained by the sleeve to prevent the annular groove of the sleeve from expanding outwards, a large amount of energy of the piston rod can be consumed, the kinetic energy of the piston rod is further reduced, and the speed of the piston rod reaching an outlet position from the bottom is reduced;

3. the connecting part of the mounting bracket replaces an independently arranged sleeve, so that the sleeve is restrained, and the parts of the initiator are reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural view of one embodiment of a detonator of the present application;

FIG. 2 is a schematic view of the structure of the top of the present sleeve;

FIG. 3 is a schematic view of the insert of the present application as a ball;

FIG. 4 is a schematic view of the snap ring of the present application;

FIG. 5 is a schematic structural view of another embodiment of the detonator of the present application;

fig. 6 is a schematic view showing a specific structure when the mounting bracket is positioned on the top of the sleeve.

Reference numerals illustrate: 1. a dust cap; 11. an annular clamping groove; 12. an annular bump; 2. a piston rod; 3. a bushing; 4. a sleeve; 41. an outlet; 42. a ring groove; 5. an open snap ring; 51. a ball; 6. a sleeve; 63. a through hole; 7. a mounting bracket; 71. a flange portion; 72. a connection part; 8. an insert; 9. a caulking groove; 10. a generator.

Detailed Description

Embodiments of the present application are described in detail below with reference to the accompanying drawings.

Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.

The embodiment of the application provides an initiator of an automobile engine cover.

As shown in fig. 1-4, an initiator of an automobile engine cover comprises a sleeve 4, a piston rod 2 and a generator 10, wherein the generator 10 is fixed at the bottom of the sleeve 4, the piston rod 2 is positioned in the sleeve 4, an outlet 41 is arranged at the top of the sleeve 4, in the embodiment of the application, the distance between a ring groove 42 and the outlet 41 of a pipe is 7-10mm, the generator 10 is actuated to drive the piston rod 2 to eject out of the outlet 41, a pipe body of the sleeve 4, which is close to the outlet 41, is provided with a ring groove 42 which is concave towards the inner side of the sleeve 4, the ring groove 42 is provided with an insert 8 which is clamped and sleeved on the periphery of the ring groove 42, when an annular bulge at the bottom of the piston rod 2 passes through the ring groove 42, the interaction with the ring groove 42 and/or the insert 8 is performed, so that the energy of the piston rod 2 is ejected out of the sleeve 4 is reduced, the kinetic energy of the piston rod 2 is reduced, and the speed of the bottom of the piston rod 2 reaching the position of the outlet 41 is reduced, but the speed of the front stage of the ejection process of the piston rod 2 is not influenced.

The initiator further comprises a sleeve 6 fixed on the sleeve 4, the sleeve 6 is of a rigid structure, the inner wall of the sleeve 6 is abutted with the insert 8 and the outer wall of the sleeve 4, and the sleeve 6 is welded on the outer wall of the sleeve 4. When the bottom of the piston rod 2 passes through the annular groove 42, the insert 8 transmits the acting force of the bottom of the piston rod 2 to the annular groove 42 to the sleeve 6, the restriction of the sleeve 6 to the sleeve 4 can prevent the annular groove 42 of the sleeve 4 from expanding outwards, a large amount of energy of the piston rod 2 can be consumed, the kinetic energy of the piston rod 2 is further reduced, and the speed of the piston rod 2 reaching the position of the outlet 41 from the bottom is reduced.

As shown in fig. 2 and 3, the top of the sleeve 6 is narrowed to form a through hole 63 and is sleeved on the top of the sleeve 4, and the diameter of the through hole 63 is larger than or equal to the diameter of the outlet 41 of the sleeve 4. The dust cap 1 is fixed to the sleeve 6, closing the top end of the through hole 63. The top of the sleeve 6 is narrowed to enhance the top strength of the whole initiator, so that larger gunpowder amount can be matched; the bottom of the sleeve 6 extends 8-15cm below the ring groove 42. The dust cap 1 is at least partially embedded in the through hole 63 and enters the top of the sleeve 4, the bottom of the dust cap 1 is provided with an embedded groove 9 for embedding the top of the piston rod 2, and a guiding effect is provided for the piston rod 2 in the ejection process of the piston rod 2. The outer wall circumference of caulking groove 9 is equipped with annular draw-in groove 11 and annular lug 12, and when the dust cap 1 inserts, inside the embedding groove 9 was embedded at piston rod 2 top, simultaneously export 41 and/or through-hole 73 contour edge warp annular lug 12 slide into in the annular draw-in groove 11, dust cap and sleeve, piston rod and sleeve pipe interference fit, the dust cap and the peripheral part interference fit of caulking groove 9 part improve the leakproofness of initiator.

The sleeve 4 is internally provided with a bushing 3 at the lower part of the ring groove 42, the bushing 3 is made of rubber material and sleeved on the periphery of the piston rod 2. After the explosion of the generator 10, the piston rod 2 is moved upwards by strong pressure, during the movement, the bottom of the piston rod 2 forces the bushing 3 to move upwards, and when the bushing 3 moves to the top of the pipe, the bushing 3 first encounters the resistance of the ring groove 42, and as the bushing 3 is a part of the rubber piece, the bushing is extruded into the gap between the ring groove 42 and the piston rod 2, so that part of the energy of the piston rod 2 is absorbed.

The initiator still includes installing support 7, and installing support 7 includes connecting portion 72 and flange portion 71, and connecting portion 72 cover is established and is fixed in on the sleeve pipe 4, and flange portion 71 extends to the sleeve pipe 4 outside from connecting portion 72 and is used for the initiator to connect the automobile body, and in this embodiment, installing support 7 is located the middle part of sleeve pipe 4, and installing support 7 sets up with sleeve 6 is independent.

The insert 8 is a rigid split snap ring 5. The snap ring 5 is made of SUS304, can bear the welding high temperature of 1180 ℃ and is not deformed. The opening is an opening gap of about 1-2 mm.

The split snap ring 5 is clamped on the ring groove 42, the cross section of the split snap ring 5 can be circular, and the cross section of the ring groove 42 is semicircular.

The cross section of the snap ring 5 can also be rectangular, and correspondingly, the cross section of the annular groove 42 can be trapezoidal or rectangular, and when the cross section of the annular groove 42 is trapezoidal, the trapezoid is contracted from the outside of the sleeve 4 to the inside of the annular groove. The longer inner contoured surface of the snap ring 5 engages the bottom wall of the ring groove 42. When the cross section of the ring groove 42 may be trapezoidal or rectangular, the insert 8 may be formed by overlapping a plurality of snap rings 5. And the trapezoidal ring groove 42 can be varied in width to accommodate a wider snap ring 5.

The insert 8 may also be a plurality of beads 51 that are wrapped around the circumferential groove 42.

In another embodiment, as shown in fig. 5 and 6, the inner wall of the connecting portion 72 abuts the insert 8 and the outer wall of the sleeve 4. The connecting portion 72 plays the same role as the sleeve 6 in the previous embodiment, and the connecting portion 72 restrains the ring groove 42 of the sleeve 4, so that the ring groove 42 of the sleeve 4 is prevented from expanding outwards, a large amount of energy of the piston rod 2 can be consumed, the kinetic energy of the piston rod 2 is further reduced, and the situation that the piston rod 2 flies out with larger kinetic energy is improved. The ring groove 42 is restrained by the connecting part 72 of the mounting bracket 7, so that the sleeve 6 parts are not needed to be added, and the cost is saved. The embodiment is suitable for the arrangement with smaller gap between the mounting table-board of the exploder and the hinge.

The flange portion 71 is flush with the top of the sleeve 4. The dustproof cap 1 is made of RE42EPT material and is adhered to the flange of the mounting bracket 7 through high-temperature-resistant glue.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an automobile engine hood's initiator, including sleeve pipe, piston rod and generator, the generator is fixed in the sleeve pipe bottom, the piston rod is located the sleeve pipe is intraductal, the sleeve pipe top is equipped with the export, the generator actuates, drive the piston rod is ejecting from the export, characterized in that, be equipped with on the body that the sleeve pipe is close to the export towards the concave annular in sleeve pipe inboard, be equipped with the cutting ferrule on the annular periphery on the annular, the annular protruding of piston rod bottom is when passing through the annular, with annular and/or the inserts interact, reduce the piston rod is ejecting the sleeve pipe energy, reduce the kinetic energy of piston rod, reduce the speed that the piston rod bottom arrived the exit position, the initiator still includes the sleeve that is fixed on the sleeve pipe, the sleeve pipe is rigid structure, sleeve inner wall butt insert and sleeve pipe outer wall, sleeve pipe top is narrowly formed the through-hole and is overlapped and is established at the sleeve pipe top, the through-hole diameter is greater than or equal to the export;

the insert is a rigid open snap ring or a plurality of beads surrounding the ring groove.

2. The primer of an automobile engine cover according to claim 1, further comprising a dust cap fixed on the sleeve, closing the top end of the through hole, and at least partially embedding the dust cap into the through hole, wherein a bottom of the dust cap is provided with a caulking groove into which the top of the piston rod is embedded.

3. The primer of the automobile engine cover according to claim 2, wherein the dust cap is provided with an annular clamping groove and an annular protruding block in the circumferential direction of the outer wall of the caulking groove, when the piston rod is embedded into the caulking groove, the edge of the outlet and/or the through hole passes through the annular protruding block and then slides into the annular clamping groove, and the dust cap is in interference fit with the sleeve, the piston rod and the sleeve.

4. The initiator of an automotive hood of claim 1 wherein the split snap ring is rectangular in cross section and the longer inner contoured surface of the split snap ring conforms to the bottom wall of the ring groove.