Air bag cover plate

Abstract

The invention discloses an air bag cover plate which comprises an instrument board and an air bag frame located below the instrument board, a weakening line penetrates through the instrument board, an included angle is formed between the arrangement direction of the weakening line and the vertical direction, the value range of the included angle is 10-80 degrees, and the inclined weakening line can guide cracks to expand along a preset path. Therefore, the fracture direction of the cover plate is controlled. It is very important to ensure that the air bag is unfolded according to an expected mode during blasting; stress distribution is optimized, local stress concentration is reduced, and the overall strength and stability of the cover plate are improved; it can be guaranteed that accidental fragments or splashes cannot be generated when the air bag is exploded, and the safety of passengers is improved.

Description

Technical Field

[0001] The present invention relates to an airbag structure, and more particularly to an airbag cover plate. Background Art

[0002] The automotive airbag system (Supplermental Restraint System, abbreviated as SRS) is an auxiliary protection system. Generally, the airbag at the driver's side is stored in the steering wheel pad. Therefore, in the past, when some high-end foreign steering wheels were marked with the words "SRS" or "Airbag", it could be known that this vehicle was equipped with an airbag. However, with people's increasing attention to vehicle safety performance, the high attention of relevant national departments to the application of automotive safety devices, and the popularization of automotive airbag system technology, now many domestic cars are equipped with airbags. And in order to better protect the safety of the occupants in the vehicle, the position of the airbag is not limited to the steering wheel pad on the driver's side. Many cars also have airbags in the instrument panel on the passenger side.

[0003] For example, the Chinese invention patent application with the publication number CN115447528A and the application name of "Cover for Airbag Device, Interior Trim Member, and Manufacturing Method of Cover" discloses a cover for an airbag device. The airbag device is arranged on a support member, and the support member has an outlet opening of the airbag covered by a cover member. The cover has a covering layer applied to the support member and the cover member, wherein in or near the hinge portion of the cover member, the covering layer is weakened along a weakening line.

[0004] In the prior art, usually only a weakening area is provided on the covering layer, and the setting direction of the weakening line coincides with the vertical direction. During actual blasting, the friction force generated during the opening process of the cover plate mainly comes from the direct contact between the cover plate and the surrounding structures. This friction force is relatively large because all the points are concentrated at the contact points, and finally debris will fly out, and it may cause stress concentration in a specific area, increasing the risk of fracture. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides an airbag cover plate that can control the fracture direction and improve safety.

[0006] To solve the above technical problems, the present invention is solved by the following technical solutions: An airbag cover plate includes an instrument panel and an airbag frame located below the instrument panel. A weakening line is provided through the instrument panel, and the arrangement direction of the weakening line forms an angle with the vertical direction, and the value range of the angle is 10° to 80°.

[0007] In the above technical solution, the instrument panel sequentially includes a surface layer, an elastic layer, and an instrument panel skeleton from outside to inside.

[0008] In the above technical solution, the weakening lines are divided into two groups and symmetrically penetrate through the instrument panel. The first group of weakening lines includes a first weakening line penetrating through the surface layer, a second weakening line penetrating through the elastic layer, and a third weakening line penetrating through the instrument panel skeleton. The second group of weakening lines is symmetrically arranged with respect to the first group and includes a fourth weakening line penetrating through the surface layer at another position of the instrument panel, a fifth weakening line penetrating through the elastic layer, and a sixth weakening line penetrating through the instrument panel skeleton.

[0009] In the above technical solution, the extension lines of the first weakening line, the second weakening line, and the third weakening line are all on the same straight line, and the extension lines of the fourth weakening line, the fifth weakening line, and the sixth weakening line are also all on the same straight line.

[0010] In the above technical solution, there is a distance a between the first weakening line and the symmetric fourth weakening line, a distance b between the second weakening line and the symmetric fifth weakening line, and a distance c between the third weakening line and the symmetric sixth weakening line, and there is a relational expression among a, b, and c: a > b > c.

[0011] In the above technical solution, the starting position of the first weakening line is on the extension line that is 45 degrees off from the starting point of the second weakening line, and the starting point of the second weakening line is on the extension line that is 45 degrees off from the starting point of the third weakening line.

[0012] In the above technical solution, the first group of weakening lines are arranged parallel to each other, and the second group of weakening lines are arranged parallel to each other.

[0013] In the above technical solution, when the set thickness of the surface layer is 1 - 1.5 mm, the included angle between the arrangement direction of the weakening lines and the vertical direction is 30° - 80°.

[0014] In the above technical solution, when the set thickness of the elastic layer is 2 - 5 mm, the included angle between the arrangement direction of the weakening lines and the vertical direction is 20° - 65°.

[0015] In the above technical solution, when the set thickness of the instrument panel skeleton is 3 - 4 mm, the included angle between the arrangement direction of the weakening lines and the vertical direction is 10° - 60°.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Controlling the fracture direction: The inclined weakening lines can guide the crack to expand along a predetermined path, thereby controlling the fracture direction of the cover plate. This is very important for ensuring that the airbag deploys in the expected manner during blasting; 2. Uniform stress distribution: Optimize the stress distribution, reduce local stress concentration, and improve the overall strength and stability of the cover plate; 3. Improving safety: Helps to ensure that no unexpected fragments or splashes are generated during the blasting of the airbag, improving passenger safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural view of the hidden surface of the instrument panel body.

[0019] Figure 2 It is a sectional structural view of the layout position of the weakening lines of the instrument panel body.

[0020] Figure 3 is Figure 2 The partial enlarged view of part A in

[0021] Figure 4 It is a schematic sectional structural view of the instrument panel body with the weakening lines arranged in a non-straight line form.

[0022] Figure 5 is Figure 4 The partial enlarged view of part B in

[0023] Figure 6 is Figure 4 The partial enlarged view of part D in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described in detail below with reference to the drawings.

[0025] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description can be used in other embodiments, deformation schemes, improvement schemes, equivalent schemes, and other technical schemes without departing from the spirit and scope of the present invention.

[0026] Those skilled in the art should understand that in the disclosure of the present invention, the orientations or positions indicated by terms such as "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or position relationships shown in the drawings. This is only for the convenience of simplifying the description of the present invention and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0027] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0028] See Figures 1 to 6 , an airbag cover plate, comprising an instrument panel 1 and an airbag frame 2 located below the instrument panel 1. A weakening line is provided through the instrument panel 1. The weakening line is divided into two groups and symmetrically arranged through the instrument panel 1, and there is an included angle between the arrangement direction of the weakening line and the vertical direction, and the value range of the included angle is 10° to 80°.

[0029] Among them, the instrument panel 1 sequentially includes a surface layer 11, an elastic layer 12, and an instrument panel skeleton 13 from outside to inside. The surface layer, the elastic layer, and the instrument panel skeleton are adhesively compounded into an integral structure through glue, and the material of the elastic layer is mesh or foam.

[0030] That is to say, weakening lines are provided on the surface layer 11, the elastic layer 12, and the instrument panel skeleton 13. Specifically, the first group of weakening lines includes a first weakening line 111 penetrating through the surface layer 11, a second weakening line 121 penetrating through the elastic layer 12, and a third weakening line 131 penetrating through the instrument panel skeleton 13. The second group of weakening lines is symmetrically arranged with respect to the first group, and includes a fourth weakening line 112 penetrating through the surface layer 11 at another position of the instrument panel 1, a fifth weakening line 122 penetrating through the elastic layer 12, and a sixth weakening line 132 penetrating through the instrument panel skeleton 13.

[0031] That is to say, the first weakening line 111 and the fourth weakening line 112 are symmetrically arranged, the second weakening line 121 and the fifth weakening line 122 are symmetrically arranged, and the third weakening line 131 and the sixth weakening line 132 are symmetrically arranged.

[0032] When the extension lines of the first weakening line 111, the second weakening line 121, and the third weakening line 131 and the extension lines of the fourth weakening line 112, the fifth weakening line 122, and the sixth weakening line 132 are all on the same straight line, it means that the angles between the first weakening line 111, the second weakening line 121, the third weakening line 131, the fourth weakening line 112, the fifth weakening line 122, and the sixth weakening line 132 and the vertical direction are all equal.

[0033] The angle value between the weakening line 132 and the vertical direction depends on the set thicknesses of the surface layer 11, the elastic layer 12, and the instrument panel skeleton 13. Of course, there is no association among the three.

[0034] When the set thickness of the surface layer 11 is 1 - 1.5 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 30° - 80°. When the set thickness of the elastic layer 12 is 2 - 5 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 20° - 65°. When the set thickness of the instrument panel skeleton 13 is 3 - 4 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 10° - 60°.

[0035] When the extension lines of the first weakening line 111, the second weakening line 121, and the third weakening line 131 and the extension lines of the fourth weakening line 112, the fifth weakening line 122, and the sixth weakening line 132 are not on the same straight line, there are two cases.

[0036] One case can be that the first weakening line 111, the second weakening line 121, and the third weakening line 131 are parallel to each other, and the fourth weakening line 112, the fifth weakening line 122, and the sixth weakening line 132 are parallel to each other.

[0037] And there is a distance a between the first weakening line 111 and its symmetric fourth weakening line 112, a distance b between the second weakening line 121 and its symmetric fifth weakening line 122, and a distance c between the third weakening line 131 and its symmetric sixth weakening line 132. And there is a relationship among a, b, and c: a > b > c.

[0038] Similarly, when there is a relationship among a, b, and c: a > b > c, there is another case. That is, the first weakening line 111, the second weakening line 121, and the third weakening line 131 are not parallel to each other, and the fourth weakening line 112, the fifth weakening line 122, and the sixth weakening line 132 are not parallel to each other. At this time, it is necessary to satisfy that the starting point position of the first weakening line 111 is on the extension line of the starting point of the second weakening line 121 deviated by 45 degrees, and the starting point of the second weakening line 121 is on the extension line of the starting point of the third weakening line 131 deviated by 45 degrees.

[0039] Of course, when the thickness of the surface layer 11 is set to be 1 - 1.5 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 30° - 80°; when the thickness of the elastic layer 12 is set to be 2 - 5 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 20° - 65°; when the thickness of the instrument panel skeleton 13 is set to be 3 - 4 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 10° - 60°.

[0040] Through the above solution, the obliquely arranged weakening lines make the stress distribution more uniform when the cover plate is unfolded, reducing local stress concentration. This not only reduces the risk of fracture, but also makes the friction relatively small because the stress is more effectively dispersed. When the angle between the weakening line and the vertical direction is 45°, the friction is reduced by half and the opening edge of the cover plate is the cleanest.

[0041] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments, and the embodiments of the present invention can have any deformation or modification without departing from the said principles.

Claims

1. An airbag cover, comprising an instrument panel (1) and an airbag frame (2) located below the instrument panel (1), characterized in that: A weakening line is arranged through the instrument panel (1), and there is an angle between the arrangement direction of the weakening line and the vertical direction, and the angle has a value range of 10° to 80°.

2. The airbag cover according to claim 1, characterized in that: The instrument panel (1) comprises, from the outside to the inside, a surface layer (11), an elastic layer (12) and an instrument panel frame (13).

3. The airbag cover according to claim 2, characterized in that: The weakening lines are divided into two groups and are symmetrically arranged on the instrument panel (1), the first group of weakening lines comprising a first weakening line (111) extending through the surface layer (11), a second weakening line (121) extending through the elastic layer (12), and a third weakening line (131) extending through the instrument panel frame (13); the second group of weakening lines is symmetrically arranged to the first group, comprising a fourth weakening line (112) extending through the surface layer (11) at another position of the instrument panel, a fifth weakening line (122) extending through the elastic layer (12), and a sixth weakening line (132) extending through the instrument panel frame (13).

4. The airbag cover according to claim 3, characterized in that: The extension lines of the first weakening line (111), the second weakening line (121) and the third weakening line (131) are all located on the same straight line, and the extension lines of the fourth weakening line (112), the fifth weakening line (122) and the sixth weakening line (132) are also all located on the same straight line.

5. The airbag cover according to claim 3, characterized in that: There is a distance a between the first weakening line (111) and the fourth weakening line (112) symmetrical thereto, there is a distance b between the second weakening line (121) and the fifth weakening line (122) symmetrical thereto, there is a distance c between the third weakening line (131) and the sixth weakening line (132) symmetrical thereto, and a, b, and c are related by the formula: a>b>c.

6. The airbag cover according to claim 5, characterized in that: The starting point of the first weakening line (111) is located on the extension line of the starting point of the second weakening line (121) which deviates from the angle of 45 degrees, and the starting point of the second weakening line (121) is located on the extension line of the starting point of the third weakening line (131) which deviates from the angle of 45 degrees.

7. The airbag cover according to claim 5, characterized in that: The first group of weakened lines are arranged parallel to each other, and the second group of weakened lines are arranged parallel to each other.

8. The airbag cover according to claim 2, characterized in that: When the thickness of the surface layer (11) is set to be 1 to 1.5 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 30° to 80°.

9. The airbag cover according to claim 2, characterized in that: When the thickness of the elastic layer (12) is set to be 2 to 5 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 20° to 65°.

10. The airbag cover according to claim 2, characterized in that: When the thickness of the instrument panel frame (13) is set to 3 to 4 mm, the angle between the arrangement direction of the weakening line and the vertical direction is 10° to 60°.

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