CN1153722A - Air bag cover and manufacturing method thereof - Google Patents
Air bag cover and manufacturing method thereof Download PDFInfo
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- CN1153722A CN1153722A CN96122794A CN96122794A CN1153722A CN 1153722 A CN1153722 A CN 1153722A CN 96122794 A CN96122794 A CN 96122794A CN 96122794 A CN96122794 A CN 96122794A CN 1153722 A CN1153722 A CN 1153722A
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- air bag
- bag cover
- hole
- heating process
- trim board
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Abstract
An air bag cover is made of thermoplastic resin and covers an air bag. A plurality of holes are provided with the air bag cover continuously and a breakable portion is provided which severs upon the inflation of the air bag. The surface side of the breakable portion is processed by a heating process, so that protrusions which partially plug the holes are formed on the inner circumferential surface of the holes on the surface side.
Description
Japan's being illustrated for your guidance in this manual in submission on September 22 nineteen ninety-five at first to file-Japanese patent application No.Hei7-244832.
The present invention relates to a kind of air bag cover and manufacture method thereof, this air bag cover is used for the folded airbag of cover cap airbag apparatus, and wherein, this air bag cover is made by thermoplastic base resin and is used for instrument carrier panel, door decorations, back of seat, bearing circle liner etc.Particularly, but air bag cover has a tear portion, comprises the hole that some form continuously, and is outstanding from overhead guard in the time of can allowing airbag inflation.
In the air bag cover of the folded airbag of traditional cover cap airbag apparatus, but but be provided with a smooth break and allow the outstanding tear portion of airbag inflation.
But for above-mentioned tear portion, operated by rotary motion has some holes, discloses in the open text No.Sho.51-1932 of Japanese Utility Model.
But in above-mentioned air bag cover, a plurality of holes are arranged on the outside face of air bag cover, and this impairs the outward appearance of air bag cover.
The object of the invention is to provide a kind of air bag cover and manufacture method thereof, wherein, even but being provided with a plurality of holes as the tearing part, the design of air bag cover is also improved.
According to the present invention, a kind of air bag cover is provided, comprising: but the hole on some tearing parts of rupturing when being arranged on airbag inflation; Wherein, be formed with a projection on each hole inner peripheral surface, the opening in this bossing obstruction or partially enclosed described hole.
According to the present invention, a kind of manufacture method of air bag cover is provided, comprise the steps: on the overhead guard main part, to form the face side of some holes and heating gate, so that the opening in partially enclosed at least hole prevents that simultaneously the load of tearing of air bag cover from increasing.
In air bag cover of the present invention, if but the tearing part is formed with some holes, and the opening in these holes is stopped up by the bossing that is formed at by heating process on the inner peripheral surface of hole.
Therefore, cannot see opening, the outward appearance of air bag cover and design are improved.
In above-mentioned heat process, adjoin or the material that surrounds the hole opening melts and diffusion to form projection and part plugging hole.So the open surfaces in hole is not stopped up fully.Like this, but prevented the increase of tearing load of tear portion.
Air bag cover of the present invention comprises that a trim board and that is positioned at face side is positioned at the matrix part that the trim board bottom side forms by injection molded.Trim board comprises two-layer at least, that is, be positioned at the skin covering of the surface of face side and be positioned at that the protection skin covering of the surface is not subjected to the molded barrier layere that influences of matrix part below the skin covering of the surface.Therefore, the skin covering of the surface that is positioned at face side has improved the design of air bag cover.Much less, skin covering of the surface is subjected to being positioned at the protection of the barrier layere under it.
In addition, the internal diameter in the hole before the heating is preferably disposed between 0.5 to 1.0 millimeter.If the internal diameter of pin hole is less than 0.5 millimeter, but whether pin hole is partly stopped up the load of tearing that all is difficult to reduce tear portion.If the internal diameter of pin hole greater than 1.0 millimeters, stops up pin hole even also be difficult to part after heating process.
In addition, by adopting softening point to be lower than 200 ℃ material, in heating process by apply the about 120 ℃ hot gas of temperature or air bag cover place temperature be controlled in about 120 the degree heating furnaces in, but just part plugging hole in the short time, promptly, can adopt common apparatus, thereby simplify heating process.
In the manufacture method of air bag cover of the present invention, a plurality of holes are partly stopped up under the state that the increase of tearing load is avoided, thereby the design of gas caping cover is improved.
In addition, as mentioned above, the internal diameter in hole preferably is set between 0.5 to 1.0 millimeter before the heating.
Fig. 1 is an amplification view, shows the main portion of the air bag cover of one embodiment of the invention;
Fig. 2 is another amplification view of Fig. 1 main portion;
Fig. 3 is the block diagram of this embodiment of the invention;
Fig. 4 is a cutaway view, shows a kind of running condition of air bag cover of the present invention;
Fig. 5 (a) to Fig. 5 (d) but be the scheme drawing of forming process of expression air bag cover tear portion of the present invention;
Fig. 6 is the amplification view that carries out an experimental piece of tension comparative experiments, and its mesopore remains open;
Fig. 7 is the amplification view that carries out an experimental piece of tension comparative experiments, the part obstruction owing to heating process of the opening of its mesopore;
Fig. 8 is a cutaway view, shows another embodiment of the present invention;
Fig. 9 is the amplification view of further embodiment of this invention;
Figure 10 is the amplification view of yet another embodiment of the invention;
The present invention is described with reference to the accompanying drawings.
As shown in Figures 1 to 4, air bag cover 10 structures of one embodiment of the invention make a component parts of automobile instrument panel 8.Gauge panel comprises main part 9 (Fig. 4) and air bag cover 10.
Major part 9 comprises matrix part 9a and the trim board 9b that is made by the synthetic resin that has weighting material (filler) such as polypropylene etc., and the trim board 9b that forms by the following trim board 12 that extends is used to coat matrix part 9a.
As shown in Figure 4, air bag cover 10 is positioned at the top of the folded airbag 2 of airbag apparatus 1, includes a main part, and main part comprises a matrix part 11 and is positioned at the trim board 12 of its upper surface.
Airbag apparatus 1 comprises a folded airbag 2; One makes the cylindrical aerator 3 of its expansion to air bag 2 supply gas; The tubular diffuser 4 that one generation of gas that aerator 3 is produced spreads, this diffuser makes gas can flow into air bag 2; With the box-shaped enclosure 5 that envelopes around air bag 2, aerator 3 and the diffuser 4.
Label 4a represents a gas exchange mouth, and the gas that comes out from aerator 3 by it produces diffusion and flows into air bag 2.Label 4b represents some bolts that stretch out from diffuser 4.After these bolts were fastening with nut 6, shell 5, air bag 2 and diffuser 4 were combined into one, and airbag apparatus 1 is fastened on the cantilever 7 that stretches out from automotive frame.
The side wall portion of shell 5 comprises an inwall 5a and an outer wall 5b, and promptly sidewall sections has double-wall structure.Be provided with some claw 5c on outer wall 5b, the quantity of claw 5c is predetermined, and is raised to inwall 5a side.These claws 5c engages with following carriage 11a.
On air bag cover 10, but see that from above tear portion 16 is H shape, when air bag 2 expanded, two shape portions 22,23 opened.But hinge portion 24 is between two upper ends and two bottoms of H shape tear portion 16, when door portion opens as centre of gration.
Be provided with a square column type carriage 11a in the neighboring of matrix part 11.On carriage 11a, be provided with attaching hole 11b, the claw 5c of the shell 5 of airbag apparatus 1 inserts wherein.Carriage 11a is set is shell 5 and air bag cover 10, but a tear portion 16 and a door shape portion 22,23 accurately are positioned on the folded airbag 2 in order to connect airbag apparatus 1.
Skin covering of the surface 13 is preferably made by soft thermoplastic resin such as soft PVC, olefinic thermoplastic elastomer etc., these materials have and are lower than 200 degrees centigrade softening point, so that melt this material and to the opening (ubi infra) of small part plugging hole 19, and do not increase the outstanding overhead guard of air bag required tear load.
Employing has softening point, and to be lower than 200 degrees centigrade the reason of resin as follows.That is, can be in heat process by applying about 120 degrees centigrade hot air or placing temperature to be controlled in heating furnace plugging hole in very short time about 120 degrees centigrade air bag cover, heat process is simplified.
In the present embodiment, skin covering of the surface 13 is that 180 degrees centigrade soft PVC is made by softening point, and barrier layere 14 is made by the olefinic thermoplastic elastomer identical with matrix part 11 and froth bed 15 is made by polypropylene foam.Preferably 0.6 millimeter of the thickness of skin covering of the surface 13, preferably 1.0 millimeters of the thickness of barrier layere 14, and preferably 0.3 millimeter of the thickness of froth bed 15.
But in tear portion 16, on matrix part 11, have a groove 17, having an excision part 18 and some to be formed at pin hole 19 on the skin covering of the surface 13 on the barrier layere 14.As shown in Figure 2, be formed at by heating that projection 20 parts on pin hole 19 inner peripherys are stopped up or the opening of partially enclosed pin hole.So the groove on cut-out 18 and the matrix part 11 forms simultaneously, and groove 17 extends to froth bed 15.So form another groove 21 again at froth bed 15.
But groove 17,21 can form continuously or intermittently at the H shape aligned position with tear portion 16.
The internal diameter of pin hole 19 is preferably disposed on (present embodiment is 0.75 millimeter) between 0.5 millimeter to 1.0 millimeters before heating.If the internal diameter of pin hole 19 is less than 0.5 millimeter, but whether pin hole 19 is partly stopped up the load of tearing that all is difficult to reduce tear portion 16.If the internal diameter of pin hole 19 is not less than 1.0 millimeters, even heating also is difficult to stop up pin hole 19.
In addition, but with the alignment of the H shape of tear portion 16 in, the interval of pin hole 19 is preferably less than 2 millimeters (present embodiment is 1 millimeter).If at interval greater than 2 millimeters, tearing load increases, and reduces it and launches performance.
If be formed at the hole 19 of skin covering of the surface 13 and be not pin hole but joint-cutting, the width of joint-cutting 19 is preferably between 0.5 to 1.0 millimeter.If the width of joint-cutting 19 is less than 0.5 millimeter, but whether joint-cutting 19 is partly stopped up the load of tearing that all is difficult to reduce tear portion 16.If the width of joint-cutting 19 is not less than 1.0 millimeters, even heating also is difficult to stop up joint-cutting 19.The same reason as above, the interval of joint-cutting 19 is preferably less than 2 millimeters.
Then, the trim board 12 that is configured as reservation shape is placed on the matrix part 9a of molded main part 9 in the mould, matrix part 9a is shaped by injection-molded.
Then, trim board 12 is placed in the injection molding of molded matrix parts 11, shown in Fig. 5 (b), is molded into matrix part 11.
After molded, utilize working electrode arm (working horn) H of ultrasonic bonder to form groove 17 and 21, and on the carriage 11a of matrix part 11, form connecting bore 11b, shown in Fig. 5 (c).
Below, shown in Fig. 5 (d), carry out the heating process that part is stopped up pin hole 19 openings.From 2 to 3 millimeters height blow about 120 degrees centigrade hot air on trim board 12, and the speed with 5 centimetres/per second moves simultaneously.Perhaps, air bag cover 10 is placed temperature be controlled in about 120 degrees centigrade heating furnace about 1 minute.
In above-mentioned heating process, adjoin or center on the material thawing of pin hole 19 openings and spread and stop up pin hole 19 to form projection 20.But, but in order to prevent the increase of tearing load of tear portion 16, the opening of pin hole 19 can not stop up fully.Therefore, select corresponding heating-up temperature and time of heat according to the type of heating of part plugging hole.
For example, under the situation that adopts heating furnace, the projection 20 on pin hole 19 inner circumferential surfaces often has uniform height.Therefore, hill height t is preferably disposed on 30% to 50% of pin hole 19 inner diameter d.If highly be lower than 30% of inner diameter d, just be difficult to the design that part is stopped up the opening of pin hole 19 and then improved air bag cover 10.If height is formed on the inner peripheral surface of pin hole 19 greater than 50% and projection 20 of inner diameter d, the material on pin hole 19 inner circumferential surfaces will melt and the complete closed hole, makes that tearing load increases.
On the other hand, apply under the situation of thermal current from a direction in the heating process employing, the inside face that is difficult in pin hole 19 forms has the projection 20 of even height.In this case and since the height t of a part of projection 20 inner diameter d 30% to 50% between, tearing load might not can increase.Even outward appearance looks that the opening of pin hole 19 is stopped up fully, the thawing of pin hole 19 inner circumferential surfaces part is not burn-on yet, and makes that tearing load can not increase.
Therefore, can not tear load so that do not increase according to the time of heat and the heating-up temperature of type of heating choose reasonable heating process.
Should point out, matrix part 9a, 11 and trim board 9b, 12 barrier layere 14 have between identical materials or they and have compatibility.Therefore, they just can bond together mutually without adhesive agent.
In addition, can replace ultrasonic bonder to form groove 17,21 with heating cutter or high-frequency knife.
For airbag apparatus 1 is connected on the gauge panel 8, carriage 11a is inserted between inwall 5a and the outer wall 5b.Claw 5c inserts separately and is fastened in the mounting hole 11b.If cantilever 7 is fastening and its other end is fixed on (not shown) on the crossbeam by bolt 4b and nut 6, airbag apparatus 1 just can link to each other with gauge panel 8 and be installed on the automobile together, after gauge panel 8 was fit into automobile, the instrument of preliminary election and like just can be fit into automobile.
When the gas that comes out from aerator 3 passes through the air-flow through hole 4a inflow air bag 2 of diffuser 4, but air bag makes tear portion 16 tear, and makes a shape portion 22,23 open or wrap 24 rotations of leaf portion simultaneously, and air bag just can launch from gauge panel.
In the present invention, owing to do not see pin hole 19 from the surface of air bag cover 10, thereby the design of gauge panel 8 is improved.
So, in table 1, listed the tension comparative experiments result of trim board 12.The test block of trim board 12 is prepared as follows: the froth bed that skin covering of the surface of being made by soft PVC (PVC) (0.6 millimeter of thickness) and polypropylene foam (3 millimeters of thickness) are made bonds together.Below, provide three kinds of practices.The first, the hole that has internal diameter and be 0.75 millimeter is with 1 millimeter setting at interval.The second, the opening in hole stops up by heating process, in heating process, is temperature that 120 ℃ hot air highly blows on trim board for from 2 to 3 millimeters, and the speed with 5 centimetres/per second moves simultaneously.The 3rd, the hole is not set.In addition, also use olefinic thermoplastic elastomer (TPO) (softening point is 180 ℃) to replace soft PVC to be used for skin covering of the surface.6 kinds of trim boards have promptly been prepared.They are used as test block, have No. 2 dumbbell shapes of Japanese Industrial Standards (JIS) separately.These test blocks stretch with the speed of automatic mapping formula tensile test machine with 200 mm/min.
The explanation of table 1 test block skin covering of the surface is torn load and is torn stretch ratio
Material (newton/10 millimeter) (%)
1 PVC atresia 152 280
No heating process
2 PVC porose 116 25
No heating process
3 PVC porose 90.5 18
Heating process is arranged
4 TPO atresias 85.5 630
No heating process
5 TPO porose 65 35
No heating process
6 TPO porose 60.5 20
Heating process is arranged
Fig. 6 shows the microgram (amplification rate 10) on the surface of test block 2, and Fig. 7 shows the same content of test block 3.
As shown in table 1, utilize heat process part plugging hole and hole not to stop up under two kinds of situations, trim board (load and stretch ratio) under essentially identical condition is torn.Consider Fig. 6 and 7, be appreciated that and improve the increase that design can prevent to tear load.
The air bag cover 10 of the above embodiment of the present invention comprise one be positioned at the trim board 12 of face side and be positioned under it by the injection-molded matrix part that forms 11.Trim board 12 comprises two-layer at least, promptly be positioned at the skin covering of the surface 13 of face side and be positioned at skin covering of the surface 13 rear sides, the barrier layere 14 of protection skin covering of the surface 13 when the molded matrix parts.Like this, the skin covering of the surface that is positioned at skin covering of the surface 13 rear sides has improved the design of air bag cover.Much less, the barrier layere 14 that is positioned under it of skin covering of the surface 13 is protected.
The air bag cover 10 of present embodiment has three-decker, i.e. skin covering of the surface 13, barrier layere 14 and froth bed 15.But, do not have the double-decker of froth bed 15 can be used for the air bag overhead yet, just the perceptual difference that touches some.
In addition, in air bag cover 10, be provided with the carriage 11a of the shell 5 that is used to connect air bag cover 10 and airbag apparatus 1, but so that a tear portion 16 and a door shape portion 22,23 accurately be arranged on folded airbag 2 tops.But, as shown in Figure 8,, also carriage can be set if also can accurately be arranged on the air bag top to air bag cover without carriage.
In addition, in the above-mentioned air bag cover 10, after matrix part 11 and trim board 12 formation one, form groove 17,21 and cut-out 18 simultaneously by working electrode arm H.But cut-out 18 can be on the barrier layere 14 that is formed at trim board 12 before the injection-molded matrix part 11.In this case, make trim board 12 form predetermined shape, and form porose 19 and cut-out 18.Thereafter, molded matrix parts 11, and on matrix part 11, form groove 17.Therefore, air bag cover 40 as shown in Figure 9, molded matrix part 11 are crossed the cut-out 18 embedding froth beds 15 of barrier layere 14.Heat and injection molding pressure when in this case, considering injection-molded matrix part 11 may damage froth bed 15 and skin covering of the surface 13.But the width of cut-out 18 very little (less than 0.5 millimeter) is not so froth bed 15 and skin covering of the surface 13 can damage the degree that influences trim board 12 outside faces.
Behind molded good matrix part 11, the opening of part plugging hole 19.Hole 19 can form in any time before or after cut-out 18 forms, or formed in matrix part 11 molded backs, that is to say, as long as prior to heating process.Making air bag cover 10 also is so, that is to say, can form pin hole in any time prior to heating process.
In addition, groove 17 can utilize die surface and matrix part 11 with groove 17 shapes to form simultaneously without cutter.
In above-mentioned air bag cover 10,30 and 40, hole 19 penetrates and reaches the groove 21 that is arranged at froth bed 15.But air bag cover 50 as shown in figure 10 allows hole 19 to penetrate the middle part that reaches froth bed 15.Because froth bed 15 itself is fracture easily, no matter whether hole 19 or groove 21 are formed at froth bed 12, can not influence tearing of trim board 12.Formation hole 19 is also stopped up its part after groove 21 forms.
Above-mentioned air bag cover 10,30,40 and 50 is used for gauge panel 8.But the present invention not only is used for gauge panel, can also be used for a furnishing wadding, the chair back, bearing circle etc., they can be arranged to cover airbag apparatus.In this case, having the material that the trim board of one deck can utilize soft thermoplastic resin such as soft PVC, olefinic thermoplastic elastomer or other softening point to be lower than 200 ℃ forms by injection molding.
Claims (16)
1, a kind of air bag cover of cover cap air bag comprises:
One main part comprises
But be arranged at some holes of the tearing part of main part, but rupture when airbag inflation in described tearing part;
Be formed at the projection on the perimeter surface in each described hole, the generation type of described projection is at least a portion opening of described projection sealing associated orifices.
According to the described air bag cover of claim 1, it is characterized in that 2, described main part comprises:
Be positioned at the trim board of air bag cover outside face, and be positioned at described trim board downside pass through the mold formed matrix part of injection-molded;
Wherein, the heat that trim board produces when comprising the skin covering of the surface that is positioned at face side and being used to protect skin covering of the surface not to be subjected to injection-molded matrix part and the protective cover of pressure effect, described hole is arranged at skin covering of the surface.
According to the described air bag cover of claim 1, it is characterized in that 3, the material of described main part can form above-mentioned projection by heating process.
According to the described air bag cover of claim 3, it is characterized in that 4, the internal diameter in each hole before the heating process is arranged between 0.5 millimeter to 1.0 millimeters.
According to the described air bag cover of claim 2, it is characterized in that 5, skin covering of the surface is to be lower than 200 ℃ material by softening point to make.
According to the described air bag cover of claim 3, it is characterized in that 6, the hole is the form of joint-cutting, its width is being arranged on before the heating process between 0.5 millimeter to 1.0 millimeters.
7, according to the described air bag cover of claim 2, also comprise the froth bed between skin covering of the surface and protective cover.
According to the described air bag cover of claim 1, it is characterized in that 8, each protruding height is set at 30% to 50% of each hole internal diameter.
9, a kind of method of making air bag cover comprises the steps:
On the main part of air bag cover, form some holes;
Heating gate melts and partially enclosed at least hole the material around the hole, and when not increasing airbag inflation air bag cover tear load.
10, in accordance with the method for claim 9, also comprise the steps:
Base portion forms like this:
Form trim board; And
At trim board below by the molded formation matrix part of injection molding;
Wherein, the hole is positioned on the trim board.
11, in accordance with the method for claim 9, it is characterized in that the internal diameter in each hole before the heating process is set between 0.5 millimeter to 1.0 millimeters.
12, in accordance with the method for claim 9, it is characterized in that the hole is the form of joint-cutting, its width is being set in before the heating process between 0.5 millimeter to 1.0 millimeters.
13, in accordance with the method for claim 11, it is characterized in that, form described hole with pin.
14, in accordance with the method for claim 12, it is characterized in that, form joint-cutting with cutter.
15, in accordance with the method for claim 9, it is characterized in that heating process comprises the opening that hot air is put on the hole from the top, hot air moves simultaneously.
16, in accordance with the method for claim 9, it is characterized in that heating process comprises air bag cover is placed in the heating furnace of a controlled temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96122794A CN1153722A (en) | 1995-09-22 | 1996-09-22 | Air bag cover and manufacturing method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP244832/95 | 1995-09-22 | ||
| CN96122794A CN1153722A (en) | 1995-09-22 | 1996-09-22 | Air bag cover and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1153722A true CN1153722A (en) | 1997-07-09 |
Family
ID=5127448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96122794A Pending CN1153722A (en) | 1995-09-22 | 1996-09-22 | Air bag cover and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1153722A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397000B (en) * | 2005-10-20 | 2011-02-16 | 奥托立夫开发公司 | Driver's airbag module assembly structure |
| CN101484337B (en) * | 2006-07-18 | 2011-05-18 | 高田-彼得里公开股份有限公司 | Airbag module for a motor vehicle and its production method |
| WO2017045608A1 (en) * | 2015-09-16 | 2017-03-23 | 上海延锋金桥汽车饰件系统有限公司 | Method for forming dashboard assembly and dashboard assembly obtained thereby |
| WO2018019288A1 (en) * | 2016-07-29 | 2018-02-01 | 上海延锋金桥汽车饰件系统有限公司 | Airbag door cover for vehicle |
-
1996
- 1996-09-22 CN CN96122794A patent/CN1153722A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397000B (en) * | 2005-10-20 | 2011-02-16 | 奥托立夫开发公司 | Driver's airbag module assembly structure |
| CN101484337B (en) * | 2006-07-18 | 2011-05-18 | 高田-彼得里公开股份有限公司 | Airbag module for a motor vehicle and its production method |
| WO2017045608A1 (en) * | 2015-09-16 | 2017-03-23 | 上海延锋金桥汽车饰件系统有限公司 | Method for forming dashboard assembly and dashboard assembly obtained thereby |
| WO2018019288A1 (en) * | 2016-07-29 | 2018-02-01 | 上海延锋金桥汽车饰件系统有限公司 | Airbag door cover for vehicle |
| US10682975B2 (en) | 2016-07-29 | 2020-06-16 | Shanghai Yanfeng Jingqiao Automotive Trim Systems Co. Ltd. | Vehicle interior component |
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