CN215662962U - Instrument panel with air bag door - Google Patents
Instrument panel with air bag door Download PDFInfo
- Publication number
- CN215662962U CN215662962U CN202121366675.XU CN202121366675U CN215662962U CN 215662962 U CN215662962 U CN 215662962U CN 202121366675 U CN202121366675 U CN 202121366675U CN 215662962 U CN215662962 U CN 215662962U
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- CN
- China
- Prior art keywords
- instrument panel
- base material
- groove
- airbag
- air bag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000463 material Substances 0.000 claims abstract description 49
- 238000000465 moulding Methods 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 4
- 239000006261 foam material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000005187 foaming Methods 0.000 abstract description 5
- 238000012805 post-processing Methods 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 239000006260 foam Substances 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Images
Abstract
The utility model provides an instrument panel with an airbag door. The instrument panel is composed of a base material, a sheet material and a foaming material clamped between the base material and the sheet material, a fragile part which can be cracked under the action of the pressure of the expansion of an air bag is formed on an air bag door, the base material formed by a forming die has the thickness of 2.5mm, the fragile part is composed of a groove formed on the base material by a protrusion part arranged on the forming die, the cross section of the groove is in a trapezoid shape with a downward opening, the groove is formed in a mode that the thickness of the upper bottom is 0.3mm, the depth is 1.9-2.1 mm, and the inclination angle of the inclined edge is 40-45 degrees. The instrument panel with the air bag door can ensure that the air bag is smoothly unfolded and improve the production efficiency.
Description
Technical Field
The present invention relates to an instrument panel for a motor vehicle, in particular an instrument panel with an airbag door.
Background
In order to improve the appearance of an automobile instrument panel, a sheet-like composite skin in which a sheet and a foam material are integrated is often adhered to the surface of a base material having a predetermined shape, and then the base material is evacuated to attach the composite skin to the base material by vacuum molding.
On the other hand, a passenger airbag device is generally provided on the back side of the instrument panel of the automobile in order to protect a passenger seated in a passenger seat. An instrument panel provided with such a passenger airbag device is provided with an airbag door that is deployed when the passenger airbag device is operated, so as to ensure that the airbag of the passenger airbag device can inflate into the vehicle.
The airbag door is formed with a weak portion having a thickness smaller than that of the instrument panel, and the weak portion is ruptured by a pressure of the deployment of the airbag to open the airbag door. Thus, the smooth deployment of the airbag can be ensured, and the time required for the deployment of the airbag can be shortened.
However, since such a fragile portion is generally obtained by performing post-processing in which a base material is cut by an end mill (a groove having a rectangular cross section is formed in the base material) after injection molding of the base material by a molding die (mold), there are problems that a loss may be caused by poor post-processing and that production efficiency is low because a processing time is long.
Therefore, in order to eliminate the post-processing, it is conceivable to use a molding die having a protrusion portion having a rectangular cross section, and form a groove having a rectangular cross section on the base material using the protrusion portion having a rectangular cross section. Thus, the injection molding of the base material can be performed while forming the groove in the base material. However, in this case, the protrusion portion having a rectangular cross section may be broken by a force generated by the resin flow.
Further, it is also conceivable to use a slide mold as the molding mold, and to form the groove having a rectangular cross section by sliding after the resin is injected and before the resin is cured. However, in this case, the mold structure becomes complicated, and the number of maintenance operations increases, which leads to a problem of a decrease in production efficiency.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide an instrument panel having an airbag door, which can ensure smooth deployment of an airbag and improve production efficiency.
In order to solve the above-described problems, the present invention provides an instrument panel having an airbag door, the instrument panel including a base material, a sheet, and a foam interposed between the base material and the sheet, the airbag door having a weak portion that is ruptured by a pressure of deployment of an airbag, wherein the base material molded by a molding die has a thickness of 2.5mm, the weak portion includes a groove formed in the base material by a protrusion provided in the molding die, the groove has a trapezoidal cross-sectional shape that opens downward, the groove has an upper bottom thickness of 0.3mm, a depth of 1.9 to 2.1mm, and an inclination angle of an oblique side is 40 to 45 °.
In the instrument panel with an airbag door according to the present invention, since the groove having a depth of 1.9 to 2.1mm is formed in the substrate having a thickness of 2.5mm and the remaining thickness of the substrate at the fragile portion, that is, the upper bottom thickness of the groove is 0.4 to 0.6mm, the fragile portion can be surely ruptured by the pressure of the airbag deployment to open the airbag door, and the airbag can be surely smoothly deployed.
Further, since the cross-sectional shape of the groove constituting the weak portion is a trapezoidal shape that opens downward, and the protrusion provided on the molding die has a trapezoidal cross-section corresponding to the shape of the groove, the protrusion is less likely to be damaged by the force generated by the resin flow. Moreover, the inclination angle of the oblique side of the groove is set to 40-45 degrees, so that the die cutting gradient is ensured, and the die cutting can be easily carried out even if a sliding die is not adopted. In this way, by using the molding die provided with the projection portion having a trapezoidal cross section, the groove constituting the fragile portion can be formed at the same time as molding of the base material, so that post-processing using an end mill can be abolished, and the production efficiency can be improved.
Therefore, according to the present invention, it is possible to provide an instrument panel having an airbag door that can ensure smooth deployment of an airbag and improve production efficiency.
Drawings
Fig. 1 is a perspective view schematically showing an instrument panel according to an embodiment of the present invention.
Fig. 2 is a sectional view schematically showing a fragile part of the instrument panel shown in fig. 1.
Fig. 3 is a view showing the specification parameters of the base material at the fragile portion shown in fig. 2.
Fig. 4 is a sectional view schematically showing a fragile part of a conventional instrument panel.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the contents described in the following embodiments. In addition, the dimensional relationship (length, width, etc.) in each drawing does not reflect the actual dimensional relationship.
Fig. 1 is a perspective view schematically showing an instrument panel 1 according to the present embodiment. Here, a vehicle (not shown) employing the instrument panel 1 is a right-hand vehicle, which is a left-hand vehicle in which a steering device (not shown) is provided on the left side in the vehicle width direction. In fig. 1, arrow Fr shows the front side in the vehicle length direction, arrow Up shows the upper side in the vertical direction, and arrow Rh shows the right side in the vehicle width direction.
Normally, a driver seat airbag device (not shown) for protecting a driver is provided at a rear end portion of a steering column (not shown), and a passenger seat airbag device 20 for protecting an occupant seated in a passenger seat is provided on a back surface side of an instrument panel 1 on a right side in a vehicle width direction as shown in fig. 1. Therefore, the instrument panel 1 is provided with the airbag door 3 that opens when the passenger airbag device 20 operates, so as to ensure that the airbag of the passenger airbag device 20 can inflate and deploy into the vehicle.
As shown in fig. 1, the airbag door 3 is formed with a weak portion 10 having a thickness smaller than the panel thickness of the instrument panel 1. The fragile portion 10 is ruptured by the pressure of the airbag deployment to reliably open the airbag door 3, thereby ensuring smooth deployment of the airbag and increasing the time required for the deployment of the airbag.
Fig. 2 is a sectional view schematically showing the fragile part 10 of the instrument panel 1. As shown in fig. 2, the instrument panel 1 is configured to have a three-layer structure including a base material 15, a sheet 11, and a foam 13 interposed between the base material 15 and the sheet 11.
The sheet 11 constitutes the surface (appearance surface) of the instrument panel 1, gives a high-quality appearance, and has a thickness of approximately 0.4 to 1.0 mm. As the sheet 11, for example, a thermoplastic sheet made of thermoplastic resin such as PV C (polyvinyl chloride), TPO (olefin thermoplastic elastomer), TPU (thermoplastic polyurethane elastomer) and the like can be used.
The foam material 13 is a foam for imparting a soft hand feeling to the instrument panel 1, and has a foaming ratio of 10 to 30 times and a thickness of about 1.0 to 3.0 mm. As the foaming material 13, for example, polypropylene foam, polyethylene foam, polyurethane foam, or the like can be used.
The base material 15 is a hard member that serves as a skeleton of the instrument panel 1. As the substrate 15, PP (polypropylene) can be used. In the present embodiment, the base material 15 of the instrument panel 1 is injection-molded using a molding die (not shown), and the obtained base material 15 has a thickness of 2.5 mm.
In addition, there are also structures using a slush skin and a urethane foam as the sheet 11 and the foaming material 13. However, in this case, a gap of about 5.0 to 8.0mm is required to flow the urethane between the sheet 11 and the base material 15 during urethane injection foaming, and thus there is a problem that the thickness of the instrument panel 1 increases. Further, the back surface of the slush skin of the fragile portion needs to be post-processed by a hot knife or the like to form a notch, which causes a problem of low production efficiency.
In contrast, in the instrument panel 1 of the present embodiment, since the thickness of the foamed material 13 can be suppressed to 2.0 to 3.0mm by using the thermoplastic sheet and the polypropylene foam as the sheet 11 and the foamed material 13, the thickness of the instrument panel 1 can be reduced and the space inside the vehicle compartment can be enlarged, and the sheet 11 does not need to be notched, thereby improving the production efficiency, as compared with the case of using the slush-molded skin and the polyurethane foam.
Next, the fragile portion 10 formed in the airbag door 3 will be described in detail. In order to make the structure of the present embodiment easier to understand, a description will be given of a fragile portion of the related art.
Fig. 4 is a sectional view schematically showing a fragile part 110 of the instrument panel 101 according to the related art. As shown in fig. 4, the instrument panel 101 of the related art is also configured to have a three-layer structure of a base material 115, a sheet 111, and a foam 113 sandwiched between the base material 115 and the sheet 111. In such instrument panel 101, the fragile part 110 is formed by forming a rectangular groove 117 having a cross-sectional shape opening downward in the base material 115. By forming the fragile portion 110 thinner than the thickness of the instrument panel 101 in this manner, the fragile portion 110 is ruptured by the pressure of the airbag deployment to open the airbag door, and the time required for the smooth deployment of the airbag and the acceleration of the deployment of the airbag can be ensured.
However, since the fragile part 110 of the related art is obtained by performing post-processing in which the base material 115 is cut by an end mill (not shown) after injection molding of the base material 115 by a molding die (not shown), there is a possibility that loss may occur due to poor post-processing and production efficiency may be low due to a long processing time.
Therefore, in order to eliminate the post-processing, it is conceivable to use a molding die having a protrusion portion having a rectangular cross section, and form the groove 117 having a rectangular cross section on the base material 115 using the protrusion portion having a rectangular cross section. Thus, the groove 117 can be formed in the base material 115 at the same time as the injection molding of the base material 115. However, in this case, the protrusion portion having a rectangular cross section may be broken by a force generated by the resin flow.
Further, it is also conceivable to employ a slide mold as the molding mold, and to form the groove 117 having a rectangular cross section by sliding after the resin is injected and before the resin is cured. However, in this case, the mold structure becomes complicated, and the number of maintenance operations increases, which leads to a problem of a decrease in production efficiency.
In contrast, in the present embodiment, the trapezoidal groove 17 for constituting the fragile portion 10 is formed in the base material 15 by a protrusion (not shown) having a trapezoidal cross section provided in the molding die. Specifically, as shown in fig. 1, the groove 17 is formed in a trapezoidal shape having a cross-sectional shape that opens downward and has a bottom width smaller than the opening width.
Fig. 3 is a diagram showing the specification parameters of the base material 15 at the fragile portion 10. First, the remaining thickness (upper bottom thickness of the groove 17) T of the fragile portion 10 is an important dimension that affects the deployment of the airbag and is related to the tensile strength, and thus the same dimension as the fragile portion 110 of the related art is adopted. Specifically, the weak portion 10 of the present embodiment is formed with the groove 17 having the depth H of 1.9 to 2.1mm on the base material 15 having the thickness of 2.5mm, and the residual thickness T is set to 0.4 to 0.6mm, as in the case of the weak portion 110 of the related art.
By setting the residual thickness T of the base material 15 at the fragile portion 10 to 0.4 to 0.6mm, the fragile portion 10 can be easily ruptured by the pressure of the airbag deployment to open the airbag door 3, similarly to the fragile portion 110 of the related art, and thus the smooth deployment of the airbag can be ensured.
While the width B of the groove 117 of the weak portion 110 of the related art formed by post-processing of the base material 115 by end mill cutting is 1.0mm, the width B of the groove 17 (the upper bottom of the groove 17) of the weak portion 10 of the present embodiment is set to 0.3mm, which is the limit of the die molding.
In order to make the stress concentration state in the fragile portion 10 the same as that in the fragile portion 110 of the related art, it is necessary to make the bevel angle θ of the fragile portion 10 (the inclination angle of the bevel of the groove 17) 40 ° or more. Meanwhile, in order to prevent the molding die from being damaged due to the flow of the resin, it is necessary that the bevel angle θ be 45 ° or less to secure the strength of the die. Therefore, in the present embodiment, the hypotenuse angle θ of the fragile portion 10 is set to 40 to 45 °.
Since the cross-sectional shape of the projection provided on the molding die is trapezoidal corresponding to the cross-sectional shape of the groove 17, the projection is not easily broken by the force generated by the resin flow. In addition, since the bevel angle θ is set to 40 to 45 °, the die-cutting slope is ensured. Thus, the die cutting can be easily performed without using a slide die. In this way, since the concave groove 17 constituting the fragile portion 10 can be formed simultaneously with the molding of the base material 15 using the molding die, the post-processing using the end mill can be eliminated, and the production efficiency can be improved.
Therefore, according to the present embodiment, it is possible to provide the instrument panel 1 having the airbag door 3, which can improve the production efficiency while ensuring smooth deployment of the airbag.
Claims (1)
1. An instrument panel having an airbag door formed with a fragile portion which is ruptured by a pressure of deployment of an airbag, the instrument panel comprising a base material, a sheet, and a foam material sandwiched between the base material and the sheet,
the substrate molded by the molding die had a thickness of 2.5mm,
the weak portion is constituted by a groove formed on the base material by a protrusion provided on the molding die,
the cross section of the groove is in a trapezoid shape with an opening at the lower part,
the groove is constituted such that the upper bottom thickness is 0.3mm, the depth is 1.9 to 2.1mm, and the inclination angle of the inclined side is 40 to 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121366675.XU CN215662962U (en) | 2021-06-18 | 2021-06-18 | Instrument panel with air bag door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121366675.XU CN215662962U (en) | 2021-06-18 | 2021-06-18 | Instrument panel with air bag door |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215662962U true CN215662962U (en) | 2022-01-28 |
Family
ID=79975946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121366675.XU Active CN215662962U (en) | 2021-06-18 | 2021-06-18 | Instrument panel with air bag door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215662962U (en) |
-
2021
- 2021-06-18 CN CN202121366675.XU patent/CN215662962U/en active Active
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |