CN210822147U - Integrated lower cover of safety air bag gas generator - Google Patents

Abstract

The utility model discloses an integrated lower cover of an air bag gas generator, relating to the technical field of automobile air bags; including be used for with upper cover complex lower lid, be located down the lid around and with lid integrated into one piece's flange down, the middle arch that makes progress of lower lid forms the mount table and is located the recess of mount table below, the mount table is for being used for installing the mount table of ignition tube and medicine cup, be equipped with the via hole that is used for the ignition tube to pass through on the mount table. The utility model provides an air bag gas generator integral type lower cover, ignition tube can not unexpected short circuit.

Description

Integrated lower cover of safety air bag gas generator

Technical Field

The utility model belongs to the technical field of car air bag, in particular to air bag gas generator integral type lower cover.

Background

Traditional air bag gas generator structure is complicated, including upper cover, lower cover, and the upper cover forms a burning chamber with the lower cover, is equipped with the mount table that is used for fixed ignition tube in the burning chamber, and the ignition tube is used for lighting transfer powder, and the mount table rigid coupling is covered under, and its mount table is covered under through the welding rigid coupling, remains metal debris on the mount table easily, and metal debris leads to the ignition tube to be punctured and the short circuit easily.

Chinese patent CN204279333U, patent name "a pyrotechnic gas generator for automobile safety airbag"; the utility model discloses a cigarette fire formula gas generator for car air bag, cover on and be equipped with the short circuit ring, the short circuit ring is connected with some firearm, and upper cover and some firearm are connected structure as an organic whole, upper cover internally mounted has the injection molding, and the injection molding is connected with the biography firetube, is equipped with the venthole on the biography firetube, and venthole department installs the second sealing strip, the internally mounted of biography firetube and filter has the medicament, be provided with first filler and second filler between medicament and second fixed ring, be connected with first solid fixed ring on the filter, the inferior valve is equipped with the venthole, and venthole department installs first sealing strip. Although the invention is low in price, the mounting table is fixedly connected to the lower cover through welding, metal fragments are easy to remain on the mounting table, and the metal fragments are easy to cause the ignition tube to be punctured and short-circuited.

Disclosure of Invention

The utility model aims at overcoming the shortcoming that the metal fragment that prior art welding produced leads to the ignition tube short circuit easily, providing an air bag gas generator integral type lower cover, the ignition tube can not unexpected short circuit.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an air bag gas generator integral type lower cover, including be used for with upper cover complex lower lid, be located down the lid around and with lower lid integrated into one piece's flange, the protruding recess that forms the mount table and be located the mount table below that makes progress in the middle of the lower lid, the mount table of mount table for being used for installing squib and medicine cup, be equipped with the via hole that is used for the squib to pass through on the mount table. The mounting table, the lower cover body, the flange and the groove are formed by punching and molding a plate, welding is not needed, the production efficiency is greatly improved, metal fragments cannot be generated, and accidental short circuit of the ignition tube cannot occur.

Preferably, the cross section of the groove is a rounded polygon. Play the effect of preventing the injection molding body from rotating.

Preferably, the inner side wall of the groove is provided with a salient point. The function of preventing the injection molding body from being pressed out is achieved.

Preferably, the cross-sectional area of the groove decreases first and then increases in the direction from the notch to the groove bottom. The function of preventing the injection molding body from being pressed out is achieved.

Preferably, the lower cover body comprises a side plate and a bottom plate, the flange is fixedly connected to one end, far away from the bottom plate, of the side plate, a plurality of guide grooves are formed in the inner side wall of the lower cover body along the circumferential direction of the side plate, one end of each guide groove is located at the junction of the side plate and the bottom plate, and the other end of each guide groove is located at one end, far away from the bottom plate, of. The second filter screen lower extreme supports and leans on the curb plate, and when producing gas, the horizontal force that the second filter screen bottom received is by the curb plate offset point, increases the stability of filter screen, and the second filter screen if laminate completely on the curb plate, can influence the speed of giving vent to anger, and the guide slot can increase the speed of giving vent to anger, and gas is from second filter screen to guide slot, then upward movement to the upper cover, finally goes out from the venthole.

Preferably, the inner side wall of the lower cover body is provided with a plurality of annular second guide grooves, and the second guide grooves are communicated with the guide grooves. Further increasing the air outlet speed of the second filter screen.

As preferred, the rigid coupling has annular buffer board on the bottom plate of lower lid, the buffer board cover is established on the mount table, the buffer board downside is equipped with a plurality of third guide slots, the mount table has annular mounting panel at buffer board top rigid coupling, the cover is equipped with the filter screen on the mount table, filter screen top rigid coupling is on the mounting panel, filter screen bottom rigid coupling is on the buffer board, mounting panel, filter screen, bottom plate, mount table enclose into an annular air outlet cavity, third guide slot one end and air outlet cavity intercommunication, the third guide slot other end is connected with the guide slot bottom. The ignition tube ignites the transfer powder, then the gas production powder generates a large amount of gas, a part of the gas enters the gas outlet cavity through the filter screen, the gas in the gas outlet cavity moves upwards along the side wall of the upper cover after sequentially passing through the third guide groove and the guide groove, and finally leaves the main body cavity from the gas outlet hole in the upper cover to inflate the safety airbag; the other part of the gas leaves the main body cavity from the gas outlet hole through the second filter screen; produce gas medicine and produce a large amount of heats in the gas production, the gas of production takes away the heat, produces gas medicine not direct and bottom plate, mount table, medicine cup contact, greatly reduced the utility model discloses a temperature.

The utility model has the advantages that: the utility model provides an air bag gas generator integral type lower cover, ignition tube can not unexpected short circuit. In addition, the heat dissipation is good.

Drawings

FIG. 1 is a plan view of example 1;

FIG. 2 is a bottom view of embodiment 1;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a sectional view of a lower cover body in embodiment 2;

FIG. 5 is a cross-sectional view B-B of FIG. 2;

FIG. 6 is a schematic view of example 2;

FIG. 7 is a bottom view of the buffer plate;

FIG. 8 is a schematic view of an assembly of example 2 into a gas generator;

in the figure: the device comprises a lower cover body 1, a flange 2, a mounting table 3, a groove 4, an ignition tube 5, a via hole 6, an upper cover 7, a medicine cup 8, a salient point 9, a guide groove 10, a second guide groove 11, a buffer plate 12, a third guide groove 13, a support plate 14, a filter screen 15, an air outlet cavity 16, an injection molding body 17, a filter screen support 18, a second filter screen 19 and an air production area 20.

Detailed Description

The invention will be further explained in detail with reference to the drawings and the following detailed description:

example 1:

as shown in fig. 1-3: the integrated lower cover of the air bag gas generator comprises a lower cover body 1 matched with an upper cover and a flange 2 which is positioned around the lower cover body 1 and is integrally formed with the lower cover body 1, wherein the middle of the lower cover body 1 is upwards protruded to form an installation platform 3 and a groove 4 positioned below the installation platform 3, and the cross section of the groove 4 is in a shape of a round-cornered polygon; the inner side wall of the groove 4 is provided with a salient point 9; the area of the cross section of the groove 4 is firstly reduced and then increased in the direction from the notch to the groove bottom; the mounting table 3 is used for mounting the igniter tube and the medicine cup, and a through hole 6 for the igniter tube to pass through is formed in the mounting table 3.

When the embodiment is used:

the upper lid 7 is defined to be above the side of the lower lid body 1.

The flange 2, the lower cover body 1, the mounting table 3 and the groove 4 are formed by a plate in a punching mode. Avoid the metal chip that the welding produced, prevent that metal chip from with the short circuit of ignition tube. The shape of bump and recess guarantees that the injection molding body can not be extruded, and in addition, the cross section of recess 4 is fillet polygon, and the injection molding body can not rotate.

Example 2:

fig. 4 to 8 show an integrated lower cover of an airbag inflator, which includes a lower cover body 1 for cooperating with an upper cover 7, and a flange 2 located around the lower cover body 1 and integrally formed with the lower cover body 1, wherein the middle of the lower cover body 1 protrudes upwards to form a mounting table 3 and a groove 4 located below the mounting table 3, and the cross section of the groove 4 is a rounded polygon; the inner side wall of the groove 4 is provided with a salient point 9; the area of the cross section of the groove 4 is firstly reduced and then increased in the direction from the notch to the groove bottom; the mounting table 3 is used for mounting an ignition tube 5 and a medicine cup 8, and a through hole 6 for the ignition tube 5 to pass through is formed in the mounting table 3; the lower cover body 1 comprises a side plate and a bottom plate, the flange 2 is fixedly connected to one end, far away from the bottom plate, of the side plate, a plurality of guide grooves 10 are formed in the inner side wall of the lower cover body 1 along the circumferential direction of the side plate, one end of each guide groove 10 is located at the junction of the side plate and the bottom plate, and the other end of each guide groove 10 is located at one end, far away from the bottom plate; a plurality of annular second guide grooves 11 are formed in the inner side wall of the lower cover body 1, and the second guide grooves 11 are communicated with the guide grooves 10; the rigid coupling has annular buffer board 12 on the bottom plate of lower lid 1, the cover of buffer board 12 is established on mount table 3, buffer board 12 downside is equipped with a plurality of third guide slots 13, mount table 3 has annular mounting panel 14 at buffer board 12 top rigid coupling, the cover is equipped with filter screen 15 on mount table 3, 15 top rigid couplings of filter screen are on mounting panel 14, 15 bottom rigid couplings of filter screen are on buffer board 12, an annular air outlet cavity 16 is enclosed into to mounting panel 14, filter screen 15, bottom plate, mount table 3, third guide slot 13 one end and air outlet cavity 16 intercommunication, the third guide slot 13 other end is connected with guide slot 10 bottom.

When the embodiment is used:

the upper lid 7 is defined to be above the side of the lower lid body 1.

The flange 2, the lower cover body 1, the mounting table 3 and the groove 4 are formed by a plate in a punching mode. Metal chips generated by welding are avoided, and the metal chips are prevented from short-circuiting the squib 5.

This embodiment applies to gas generator, 8 welding of medicine cup on mount table 3, the via hole 6 is passed to ignition tube 5, medicine cup lower extreme and recess 4 intussuseption are filled with the injection molding 17, the medicine cup rigid coupling is on injection molding 17, medicine cup upper end rigid coupling has filter screen support 18, thereby upper cover 7 cooperation forms the main part chamber on lid 1 down, be equipped with annular second filter screen 19 in the main part chamber, 19 upper end rigid couplings of second filter screen are on filter screen support 18, 19 lower extreme rigid couplings of second filter screen are on buffer board 12 outer fringe, 19 lower extremes of second filter screen support by on the curb plate of lid 1 down, second filter screen 19, medicine cup, mounting panel 14, filter screen 15, buffer board 12 enclose into a gas production district 20, the gas production district 20 intussuseption fills the gas production medicine.

The ignition tube 5 ignites the transfer powder, then the gas production powder generates a large amount of gas, a part of the gas enters the gas outlet cavity 16 through the filter screen 15, the gas in the gas outlet cavity 16 sequentially passes through the third guide groove 13 and the guide groove 10 and then moves upwards along the side wall of the upper cover 7, and finally leaves the main body cavity from the gas outlet hole in the upper cover 7 to inflate the safety airbag; another part of the gas leaves the main body cavity from the gas outlet through a second filter screen 19; produce gas medicine and produce a large amount of heats in the gas production, the gas of production takes away the heat, produces gas medicine not direct and bottom plate, mount table 3, medicine cup contact, greatly reduced the utility model discloses a temperature. In addition, the second filter screen lower extreme supports and leans on the curb plate, and when producing gas, the horizontal force that the second filter screen bottom received is offset point by the curb plate, increases the stability of filter screen, and the second filter screen if laminate completely on the curb plate, can influence the speed of giving vent to anger, and the guide slot can increase the speed of giving vent to anger, and gas is from second filter screen to guide slot, then upward movement to the upper cover, finally goes out from the venthole.

When gas is produced, high pressure can be generated in the main body cavity, the shapes of the salient points and the grooves ensure that the injection molding body 17 cannot be extruded out, and in addition, the cross section of the groove 4 is a rounded polygon, so that the injection molding body 17 cannot rotate.

Claims (7)

1. The utility model provides an air bag gas generator integral type lower cover, is including being used for with upper cover complex lower lid, be located down the lid around and with lid integrated into one piece's flange down, its characterized in that, the protruding recess that forms the mount table and be located the mount table below that makes progress in the middle of the lower lid, the mount table is for the mount table that is used for installing ignition tube and medicine cup, be equipped with the via hole that is used for the ignition tube to pass through on the mount table.

2. An airbag inflator one-piece lower cover according to claim 1, wherein the cross section of the groove is a rounded polygon.

3. An integrated lower cover for an air bag inflator according to claim 1 wherein an inner sidewall of said recess is provided with a convex point.

4. An air bag inflator integrated lower cover according to claim 1, wherein the area of the cross section of the groove is first reduced and then increased in a direction from the notch to the groove bottom.

5. The integrated lower cover for the air bag gas generator according to claim 1, 2, 3 or 4, wherein the lower cover comprises a side plate and a bottom plate, the flange is fixedly connected to one end of the side plate away from the bottom plate, a plurality of guide grooves are formed in the inner side wall of the lower cover along the circumferential direction of the side plate, one end of each guide groove is located at the junction of the side plate and the bottom plate, and the other end of each guide groove is located at one end of the side plate away from the bottom plate.

6. An air bag inflator integrated lower cover according to claim 5 wherein the inner side wall of the lower cover body is provided with a plurality of second guide grooves of annular shape, the second guide grooves communicating with the guide grooves.

7. The integrated lower cover of the airbag gas generator as claimed in claim 5, wherein an annular buffer plate is fixedly connected to a bottom plate of the lower cover body, the buffer plate is sleeved on the mounting table, a plurality of third guide grooves are formed in the lower side of the buffer plate, an annular support plate is fixedly connected to the mounting table above the buffer plate, a filter screen is sleeved on the mounting table, the top end of the filter screen is fixedly connected to the support plate, the bottom end of the filter screen is fixedly connected to the buffer plate, the support plate, the bottom plate and the mounting table enclose an annular gas outlet cavity, one end of each third guide groove is communicated with the gas outlet cavity, and the other end of each third guide groove is connected to the bottom end of the corresponding guide groove.

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