CN114734947A - Air bag blasting weakening structure - Google Patents

Abstract

The invention provides an airbag blasting weakening structure which comprises an interior trimming plate, wherein a semi-enclosed weakening line is arranged on the surface of the interior trimming plate, an air bag door is formed by the enclosed area of the weakening line, an air bag assembly is arranged on the back of the air bag door, and the thickness of the plate body on two sides or one side of the weakening line is larger than that of the air bag door and the interior trimming plate. According to the scheme, the two sides of the thickened weakening line are used for avoiding tearing of parts on the periphery of the weakening line after the weakening line is broken, so that fragments are splashed, and meanwhile, due to the fact that the structures on the two sides of the weakening line are strengthened, the strength of the airbag is more concentrated on the position of the weakening line when the airbag is detonated, and the influence of the fragmentation of the interior trim panel or the airbag door on detonation force on detonation time is avoided.

Description

Airbag burst weakened structure

technical field

The invention relates to the field of airbags, in particular to an airbag burst weakening structure.

Background technique

A vehicle airbag module is a vehicle accessory used to protect the driver and passengers. It is generally installed on the steering wheel, dashboard, etc. A vehicle airbag assembly mainly includes an airbag, an airbag door that covers the airbag, and an airbag door hinge that connects the airbag door to a carrier member. When the airbag assembly is triggered, the airbag door is opened by the weakening line structure of the periphery of the airbag door, so that the airbag can be ejected, and the airbag door hinge can guide the airbag door when it is opened. Depending on the size of the airbag door used, when the airbag assembly is triggered, different forces act on the weakening line around the airbag door and the hinge at the position of the rotation axis. The larger the size or weight of the airbag door, or the more ignition devices of the same airbag, the greater the force acting on the weakening line around the airbag door and the hinge at the hinge. At the moment when the airbag is ignited, the ignition device in the ignition device is activated instantly, and the gas quickly spreads the airbag cloth in a short time. At this time, the expansion of the airbag cloth will exert two forces on the parts carrying the airbag: one force directly acts on the weakening line around the airbag door, tearing the area where the weakening line is located in a very short time according to the design range and direction of the weakening line , open the airbag door; another force acts on the airbag door rotating shaft and the airbag fixing point. The structure of the airbag fixed by the parts carries the blasting force and guides this force to dissipate in time to ensure the integrity of the overall part structure. At this time, in addition to the strength of the structure of the part itself, it needs to be able to withstand the blasting force, and more importantly, most of the force of the blasting body must be dissipated through the opening of the airbag door in a very short time.

At present, there are two widely used airbag door weakening methods on the market. The first is to reduce the thickness of the part that needs to be weakened during injection molding, thereby forming a weak point when the airbag is exploded and opening the airbag door; The first type is laser weakening, that is, the laser is used to cut through or half-cut the parts along the weakened line direction, so as to achieve the weakening effect. For example, Chinese patent CN111152749A discloses a burst weakening structure of an automobile passenger airbag, the scheme of which is to include oppositely arranged hinge side weakening lines and airbag opening side weakening lines, and two oppositely arranged protection side weakening lines and hinge side weakening lines The strength of the protection side is higher than that of the protection side weakening line, and the strength of the protection side weakening line is higher than that of the airbag opening side weakening line. The structure of the weakened line is the weakened pore form. However, the existing weakened holes or weakened grooves are directly processed on the original flat plate structure. After the processing is completed, the weakened holes or weakened grooves will also be relatively fragile. When the airbag burst airbag door is opened, its surrounding components are easily torn. Causes the splash of broken parts, and the splashed broken parts can easily cause secondary injuries to the members of the car.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an airbag detonation weakening structure, which ensures that the airbag door and its peripheral components remain intact when the airbag is detonated.

For realizing the above-mentioned technical purpose, the present invention has adopted the following technical solutions:

An airbag burst weakening structure, comprising an interior trim panel, the panel surface of the interior trim panel is provided with a semi-enclosed weakening line, the enclosing area of the weakening line constitutes an airbag door, and an airbag assembly is arranged on the back of the airbag door , the thickness of the plate body on both sides or one side of the weakening line is greater than the thickness of the airbag door and the interior trim panel.

In the above scheme, the two sides of the weakened line are thickened to avoid tearing the parts around the weakened line after the weakened line ruptures, resulting in the splash of fragments. At the same time, the structure on both sides of the weakened line is strengthened, which makes the airbag more concentrated when it is detonated. Avoid fragmentation of interior trim panels or airbag doors at the weakening line, consuming explosive force and affecting detonation time.

Preferably, the weakening line includes a strip groove, the strip groove is formed by molding and the thickness of the groove bottom is smaller than the thickness of the airbag door and the interior panel, and the material in the groove cavity of the strip groove is extruded to the notch Both sides form a hump structure.

Preferably, the thickness of the groove bottom of the strip groove gradually decreases from the side away from the airbag door to the side close to the airbag door.

Preferably, the side of the groove bottom close to the airbag door and its groove wall pass through a right angle or acute angle transition, and the side of the groove bottom away from the airbag door and its groove wall pass through a rounded transition.

Preferably, the hump structure and the airbag door and the interior panel transition through an arc section.

Preferably, the groove cavity of the strip-shaped groove gradually widens from bottom to top.

Preferably, the hump structure gradually widens from top to bottom, and the top of the hump structure is arc-shaped.

Preferably, both ends of the weakened line are connected by a straight hinge, the weakened line and the hinge enclose a rectangular closed structure, and the structural strength at the hinge is greater than that at the weakened line.

Preferably, the hinge includes a strip-shaped groove, the strip-shaped channel is formed by molding and the thickness of the groove bottom is smaller than the thickness of the airbag door and the interior panel, and the material in the groove cavity of the strip-shaped groove is extruded to the two sides of the groove opening. The side forms a peak-like structure, the width of the peak-like structure is greater than the width of the hump structure, the thickness and width of the groove bottom are greater than the thickness and width of the groove bottom, and the two sides of the groove bottom and the groove wall are arc transitions.

Preferably, the hinge is located in the middle of the long side of the rectangle, the length of the hinge is less than the length of the long side of the rectangle, and the long side and the short side of the rectangle transition through an arc.

Description of drawings

Fig. 1 is the installation structure schematic diagram of the present invention;

Fig. 2 is the three-dimensional schematic diagram of the present invention;

Fig. 3 is the sectional view of the present invention;

Fig. 4 is the enlarged view of A part of Fig. 3;

Fig. 5 is the B part enlarged view of Fig. 3;

Description of reference numerals: 10, interior trim panel; 20, airbag door; 30, weakening line; 31, strip groove; 311, groove bottom; 312, groove wall; 313, rounded corner; 32, hump structure; 321, arc 40, hinge; 41, strip groove; 411, groove bottom; 412, groove wall; 42, peak-like structure.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "bottom", "outside", "front and rear", etc. are based on the orientation or positional relationship shown in the state of the drawings, and are only for the convenience of description The present invention and simplified description do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; It can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

An airbag burst weakening structure, comprising an interior panel 10, a panel surface of the interior panel 10 is provided with a semi-enclosed weakening line 30, the enclosing area of the weakening line 30 constitutes an airbag door 20, and the airbag door 20 An airbag assembly is arranged on the back of the airbag, and the thickness of the plates on both sides or one side of the weakening line 30 is greater than the thickness of the airbag door 20 and the interior trim panel 10 .

As shown in Figures 1, 2, and 3, the airbag assembly generally includes an airbag inner frame and an airbag outer frame. The airbag inner frame is generally used to place and fix the airbag assembly, and the weakening line 30 is provided between the airbag inner frame and the airbag outer frame. on the interior panel 10 corresponding to the position of the gap. In actual processing, the interior trim panel 10 is an integral piece of material, and then the airbag door 20 is formed by processing the weakened line 30, and the weakened line 30 in the form of semi-envelope makes the airbag door 20 still have a part of the interior panel after the airbag is deployed. 10 is connected to prevent the entire airbag door 20 from flying out and causing injury to personnel. In addition, the interior panel 10 refers to a position where an airbag is provided, such as a cover on a steering wheel on a panel above the knee of a center control panel at the passenger position. In the present application, when the airbag is detonated, the weakening line 30 will be ruptured, and the airbag door 20 will be turned over and opened around the position where the weakening line 30 is not provided to form an opening, and the airbag will be deployed from the opening to block the occupants and vehicle parts. between. By thickening both sides of the weakening line 30, the parts around the weakening line 30 are prevented from being torn apart after the weakening line 30 is ruptured, causing the fragments to splash. Focusing on the position of the weakening line 30 avoids the fragmentation of the interior panel 10 or the airbag door 20 from consuming the explosive force and affecting the detonation time.

As shown in FIG. 4 , the weakening line 30 includes a strip-shaped groove 31 , the strip-shaped groove 31 is formed by molding and the thickness of the groove bottom 311 is smaller than the thickness of the airbag door 20 and the interior trim panel 10 , the strip-shaped groove 31 The material in the groove cavity is extruded to both sides of the groove to form a hump structure 32 . The hump structure 32 is the thickened structure on both sides of the weakening line 30, wherein the weakening line 30 is arranged on the back of the interior panel 10. The airbag door 20 and the interior panel 10 are generally formed by molding a whole piece of fiber fabric. While the fabric is being molded, the position where the weakening line 30 needs to be set is extruded through the corresponding die, and the material at this position is extruded to both sides to form the hump structure 32 and the strip groove 31 . The specific processing method is to extrude the structural features of the mold, and then present a thermoplastic or thermosetting substrate after heating. In the process of clamping the upper and lower molds of the mold, it is subjected to the extrusion force, and the area that needs to be thinned is firstly formed by force. , forming a groove-like feature, at this time, the base material originally in the groove position has a certain fluidity due to heat, and flows toward the specially designed hump structure 32 on the inner and outer sides. When the mold is closed, the molten plastic is injected on the back of the substrate along the designed back injection hole through the injection hole to form various injection molding features. There will be injection molding features on the inner and outer sides of the weakened line around the airbag door 20. At this time, the outer hump structure 32 will help the thinned area with a certain inclination and rounded corners to resist the continuous inflow of molten injection molding, and the inner hump structure 32 will help the continuous inflow of molten injection molding when the inner airbag door frame structure is formed, so as to reduce the influence of injection molding flash on the weakened structure. In the present invention, the weakened line 30 is formed once, while in the traditional method, the material of the formed interior panel 10 is cut off, and the cut material will have a certain amount of debris. If the debris is not cleaned, it will cause the vehicle to run The interior is noisy. At the same time, because the trim panel 10 is relatively brittle, when the material is cut off, it will inevitably cause slight damage to the cut site, and when the airbag is deployed, the damaged place is easily torn to form fragments, causing injury to personnel.

Preferably, the thickness of the groove bottom 311 of the strip groove 31 gradually decreases from the side away from the airbag door 20 to the side close to the airbag door 20 . In this way, when the air bag is deployed, the groove bottom 311 on the side close to the air bag door 20 is the most fragile and most easily torn apart, so that the air bag has a faster deployment speed. The thickness of the groove bottom 311 is 20%-50% of the thickness of the airbag door 20 or the interior trim panel 10 . The thickness of the groove bottom 311 on the side away from the airbag door 20 is 0.4-0.5 times the thickness of the interior panel 10 , and the thickness of the groove bottom 311 on the side close to the airbag door 20 is 0.2-0.35 times the thickness of the interior panel 10 . When the thickness is 1.5 mm, the thickness of the groove bottom 311 on the side close to the airbag door 20 is preferably 0.45 mm.

Preferably, the side of the groove bottom 311 close to the airbag door 20 and the groove wall 312 pass a right angle or an acute angle transition, preferably an acute angle transition, and the groove bottom 311 away from the airbag door 20 side and the groove wall 312 pass through a circle Corner 313 transition. In this way, a stress concentration can be formed between the side of the groove bottom 311 close to the airbag door 20 and the groove wall 312. When the airbag is detonated, an expansion force is formed from the back of the interior trim panel 10, and then the airbag door 20 and the interior trim panel 10 can be A bend is formed at the acute angle position, which also happens to be the thinnest position of the board surface, so that this position is easily broken and torn, which can accelerate the opening of the airbag door 20 . The fillet is a chamfer with a radius of 0.1m-1mm. At present, the thickness of the interior panel 10 is 1.5mm, and the selection range of the fillet radius is 0.5-0.75 times the thickness of the substrate. When the blasting impact force is transmitted to the airbag door and its vicinity, the stress will be concentrated at the acute angle position in the designed weakened structure, and within 0-200ms, the weakened line 30 around the airbag door 20 will be automatically torn, thereby The airbag door 20 is opened along the predetermined weakening line 30. At this time, the airbag fabric extends from the area where the airbag door is opened during the instantaneous expansion of the gas until it reaches the designated position, so as to protect the safety of the occupants.

Preferably, a transition between the hump structure 32 and the airbag door 20 and the interior trim panel 10 is through an arc section 321 . The formation of stress concentration between the hump structure 32 and the airbag door 20 and the interior panel 10 is avoided, so as to prevent the strip-shaped hump structure 32 from splashing due to breakage there. The radius of the arc segment 321 is selected in the range of 0.5-0.75 times the thickness of the substrate.

Preferably, the groove cavity of the strip-shaped groove 31 gradually widens from bottom to top. Wherein, up and down refers to the up and down direction shown in FIG. 3 . When bending at the acute angle position of the groove bottom 311 , the hump structures 32 on both sides and the groove wall 312 will be close to each other, so that the upper and lower are small. It can avoid the collision between the hump structures 32 and the groove walls 312 before or after the acute angle position of the groove bottom 311 is broken, prevent the collision force from offsetting part of the explosive force and cause the airbag to detonate, and avoid the airbag door 20 or interior caused by the collision. Partial fracture of the plate 10 . The width of the groove bottom 311 ranges from 0.5mm to 1.5mm, preferably 1mm.

Preferably, the hump structure 32 gradually widens from top to bottom, and the top of the hump structure 32 is in a circular arc shape. Such a shape can also prevent the hump structures 32 on both sides from colliding when the airbag is deployed, and also avoid the formation of sharp structures interfering with other components. The top arc radius of the hump structure 32 should be less than 66% of the thickness of the interior panel 10 after compression molding and should not be less than the minimum chamfer 0.1mm that can be made by molding. The top arc radius of the hump structure 32 should preferably be 0.5 times of the interior panel 10 is 0.75mm.

Preferably, two ends of the weakened line 30 are connected by a straight hinge 40 , the weakened line 30 and the hinge 40 enclose a rectangular closed structure, and the structural strength of the hinge 40 is greater than that of the weakened line 30 . In this way, it can be ensured that the position of the weakened line 30 will be cracked before the hinge 40. When the airbag is detonated, the weakened line 30 will be exploded first, and then the explosion force will be released so as not to exert too much pressure on the hinge 40. Therefore, the opened airbag door 20 will Will rotate about hinge 40.

As shown in FIG. 5 , the hinge 40 includes a strip groove 41 , the strip groove 41 is formed by molding and the thickness of the groove bottom 411 is smaller than the thickness of the airbag door 20 and the interior panel 10 . The material in the groove cavity is extruded to both sides of the groove mouth to form a peak-shaped structure 42, the width of the peak-shaped structure 42 is greater than the width of the hump structure 32, and the thickness and width of the groove bottom 411 are greater than the thickness and width of the groove bottom 311, so The arc transition between the two sides of the groove bottom 411 and the groove wall 412 is described. The structure of the hinge 40 in the above solution is similar to the structure of the weakening line 30 , and the actual rotation method is that the groove bottom 411 of the strip groove 41 is bent so that the two groove walls 412 begin to open and separate.

Preferably, the hinge 40 is located in the middle of the long side of the rectangle, the length of the hinge 40 is smaller than the length of the long side of the rectangle, and the long side and the short side of the rectangle transition through an arc. It is avoided that the airbag door 20 forms a folded corner. If the folded corner is formed, the folded corner is easily broken when the airbag door 20 is opened, and a fragment is formed.

Although the disclosure of the present application is as above, the scope of protection disclosed in the present application is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope disclosed in the present application, and these changes and modifications will all fall within the protection scope of the present invention.

Claims (10)

1. An airbag burst weakening structure, comprising an interior trim panel (10), characterized in that: a semi-surrounding weakening line (30) is provided on the panel surface of the interior trim panel (10), and the weakening line (30) ) of the enclosed area constitutes an airbag door (20), an airbag assembly is arranged on the back of the airbag door (20), and the thickness of the plates on both sides or one side of the weakened line (30) is greater than that of the airbag door (20) and the interior decoration Thickness of plate (10). 2 . The airbag burst weakening structure according to claim 1 , wherein the weakening line ( 30 ) comprises a strip groove ( 31 ), and the strip groove ( 31 ) is formed by molding and has a groove bottom ( 311 ). 3 . ) thickness is smaller than that of the airbag door (20) and the interior trim panel (10), and the material in the groove cavity of the strip groove (31) is extruded to both sides of the groove to form a hump structure (32). 3. The airbag burst weakening structure according to claim 2, wherein the groove bottom (311) of the strip-shaped groove (31) is from the side away from the airbag door (20) to the side close to the airbag door (20). The thickness of one side gradually decreases. 4. The airbag burst weakening structure according to claim 3, characterized in that: the side of the groove bottom (311) close to the airbag door (20) and its groove wall (312) pass a right angle or an acute angle transition, and the groove A rounded corner (313) transitions between the side of the bottom (311) away from the airbag door (20) and its groove wall (312). 5. The airbag burst weakening structure according to claim 4, characterized in that: the hump structure (32) transitions from the airbag door (20) and the interior trim panel (10) through an arc-shaped section (321). 6. The airbag burst weakening structure according to claim 5, wherein the groove cavity of the strip-shaped groove (31) gradually widens from bottom to top. 7 . The airbag burst weakening structure according to claim 6 , wherein the hump structure ( 32 ) gradually widens from top to bottom, and the top of the hump structure ( 32 ) is arc-shaped. 8 . 8. The airbag burst weakening structure according to claim 2 or 3 or 4 or 5 or 6 or 7, characterized in that: the two ends of the weakened line (30) are connected by a straight hinge (40), and the The weakened line (30) and the hinge (40) enclose a rectangular closed structure, and the structural strength at the hinge (40) is greater than that at the weakened line (30). 9 . The airbag burst weakening structure according to claim 8 , wherein the hinge ( 40 ) comprises a strip groove ( 41 ), the strip groove ( 41 ) is formed by molding and has a groove bottom ( 411 ). 10 . The thickness is smaller than the thickness of the airbag door (20) and the interior trim panel (10), and the material in the groove cavity of the strip groove (41) is extruded to both sides of the groove mouth to form a mountain-shaped structure (42), and the mountain-shaped structure The width of (42) is greater than the width of the hump structure (32), the thickness and width of the groove bottom (411) are greater than the thickness and width of the groove bottom (311), and the groove bottom (411) is on both sides of the groove wall (412) Arc transitions between. 10. The airbag burst weakening structure according to claim 9, wherein the hinge (40) is located in the middle of the long side of the rectangle, the length of the hinge (40) is smaller than the length of the long side of the rectangle, and the There is an arc transition between the long side and the short side.

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