Airbag device
By providing a double-layer structure and friction generating part in the airbag device, the problem of inability to effectively absorb large impact forces and lead to slip in the prior art is solved, and more effective impact absorption and damage reduction are achieved.
Patent Information
- Application Number
- CN201911334916.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2019-03-29
- Filing Date
- 2019-12-23
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2039-12-23
AI Technical Summary
When pedestrians and other vehicles collide with vehicles, existing airbag devices cannot effectively absorb large impact forces, resulting in incomplete absorption of relative displacement between pedestrians and other vehicles, which may cause secondary collisions, and airbags may cause pedestrians and others to slide.
A double-layer airbag device is designed, the outer airbag is deployed to the outside of the vehicle, the inner airbag is deployed inside the outer airbag, and a friction generator is provided on the contact surfaces of the two to generate a large friction force to suppress sliding.
It effectively suppresses the sliding of pedestrians and others when they collide with vehicles, improves the impact absorption capacity, and reduces the damage of pedestrians and others.
Smart Images
Figure CN111746457B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an airbag device that is deployed toward the front side of a vehicle, and more particularly to an airbag device for protecting pedestrians or occupants of two-wheeled vehicles (hereinafter referred to as "pedestrians, etc."). Background Art
[0002] In the currently known airbag devices, when a pedestrian collides with a vehicle, the airbag will deploy and inflate toward the front side of the front pillar of the vehicle (for example, see Patent Document 1), or the airbag will deploy and inflate toward the front side of the bumper (for example, see Patent Document 2), thereby protecting the pedestrian.
[0003] Prior art literature
[0004] Patent Literature
[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-235007
[0006] Patent Document 2: Japanese Patent Application Publication No. 2012-229014 Summary of the invention
[0007] Problems to be solved by the invention
[0008] However, in airbag devices for protecting pedestrians, etc., since pedestrians, etc. are generally more susceptible to greater impact than occupants of a vehicle, more effective impact absorption when a pedestrian, etc. collides with a vehicle is desired.
[0009] In particular, when the occupants of a two-wheeled vehicle, including a bicycle, collide with a vehicle, the relative speed of the two-wheeled vehicle and the vehicle is high, and there is little time for each other to perceive danger. Therefore, there is a possibility that they will not be able to take sufficient evasive action and will collide directly. The impact force when the occupants of the two-wheeled vehicle collide with the vehicle increases, and it is necessary to reduce the injuries to pedestrians and others.
[0010] Therefore, in order to absorb the large impact force, it is considered to install a large airbag device in the front of the vehicle.
[0011] However, if the airbag body is enlarged, the impact absorption capacity will be improved, but the contact between the pedestrian and the airbag may cause the bag body to rotate in an infinite orbit centered on the internal gas, causing the pedestrian to slide relative to the vehicle.
[0012] In this case, the airbag cannot completely absorb the relative displacement between the pedestrian and the vehicle, and bounces off the vehicle, causing a secondary collision between the pedestrian and the road surface.
[0013] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an airbag device that can suppress sliding caused by the airbag when a pedestrian or the like collides with a vehicle and can more effectively absorb the impact itself.
[0014] Means of solving problems
[0015] In order to solve the above-mentioned problems, the airbag device of the present invention is characterized in that it comprises: an outer airbag, which is deployed and inflated toward the outside of the vehicle and is composed of a base fabric; and an inner airbag, which is deployed and inflated inside the outer airbag and is composed of a base fabric, wherein in the airbag device, a friction generating portion is provided on at least one of the inner surface of the outer airbag or the outer surface of the inner airbag, and when the inner surface of the deployed outer airbag contacts the outer surface of the inner airbag, the friction generating portion generates a friction force greater than a friction force generated by overlapping the base fabrics of the outer airbag and the inner airbag.
[0016] Effects of the Invention
[0017] According to the present invention, in an airbag device for protecting pedestrians or the like, it is possible to suppress sliding caused by the airbag when the pedestrian or the like collides with a vehicle, and to more effectively absorb the impact itself. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a perspective view of a vehicle having an airbag device of the present invention;
[0019] Figure 2 is a side view of a vehicle when the airbag in the airbag device of the present invention is deployed;
[0020] 3 (a) and 3 (b) are cross-sectional views of the airbags of Embodiments 1 and 2 when the front-rear direction of the vehicle is taken as the cross-sectional direction;
[0021] Figure 4 is a cross-sectional view of the airbag according to Embodiment 3 when the front-rear direction of the vehicle is taken as the cross-sectional direction;
[0022] Figure 5 is a cross-sectional view of the airbag according to Embodiment 4 when the front-rear direction of the vehicle is taken as the cross-sectional direction;
[0023] 6( a ) and 6( b ) are schematic diagrams showing the deformation transfer of the airbag when the protected object collides with the airbag;
[0024] Figure 7 It is a side view of a vehicle including an airbag device according to a modified example of the first to fourth embodiments.
[0025] Explanation of symbols
[0026] 1: vehicle; 2: front bumper; 3: hood; 4: front fender; 5: windshield; 6: front pillar; 7: roof; 8: side door; 9: side mirror; 10: front grille; 11: logo; 100: airbag; 110: outer airbag; 120: inner airbag; 111: discharge port; 112: first raised portion (friction generating portion); 113: first convex portion (friction generating portion); 121: inner discharge port; 122: second raised portion (friction generating portion); 123: second convex portion (friction generating portion); 124: small bag body (friction generating portion); 130: first tether; 140: second tether DETAILED DESCRIPTION
[0027] The present invention is an airbag device that is deployed toward the front side of a vehicle and is used to reduce the damage to pedestrians or the like who are protected from collision with the vehicle.
[0028] The following is based on Figure 1 to Figure 7 , an airbag device according to an embodiment of the present invention is described.
[0029] Figure 1 is a perspective view of a vehicle 1 having an airbag device E, Figure 2 It is a side view of the vehicle 1 when the airbag in the airbag device E is deployed.
[0030] like Figure 1 and Figure 2 As shown, a vehicle 1 having an airbag device E has a front bumper 2 at the front end portion of the vehicle 1, a hood 3 above and to the rear of the front bumper 2, a front fender 4 on the side of the hood 3, a windshield 5 on the rear side of the hood 3, front pillars 6 on both side edges of the windshield 5, a roof 7 on the top of the vehicle 1, a side door 8 on the side portion of the vehicle 1, and a side rearview mirror 9 above the side door 8 as an external structure.
[0031] Furthermore, a front grille 10 for introducing air into the interior of the engine hood 3 and a decorative emblem 11 are provided above the front bumper 2 .
[0032] An airbag device E is provided inside (on the rear side) the front bumper 2, and the airbag 100 is folded and stored. The airbag device E may be provided inside (on the rear side) the front grille 10 instead of inside the front bumper 2.
[0033] The airbag device E includes an airbag 100 formed of a base fabric of a synthetic fiber fabric such as nylon, and a gas generator (not shown) that supplies inflation gas to the interior of the airbag 100 .
[0034] When the airbag device E detects in advance that the protected object will collide with the vehicle 1, it operates the gas generator to supply inflation gas to the inside of the airbag 100 to inflate the airbag 100. At this time, the front bumper 2 falls due to the pressure of the inflated airbag 100.
[0035] And, if Figure 2 As shown, the airbag 100 in the airbag device E is deployed and inflated from the front bumper 2 toward the front side of the vehicle 1 .
[0036] The airbag 100 includes an outer airbag 110 that is deployed and inflated toward the front of the vehicle 1 , and an inner airbag 120 that is deployed and inflated toward the front of the vehicle 1 inside the outer airbag 110 .
[0037] The outer airbag 110 has an opening 111 communicating with the outside of the outer airbag 110, and the inflation gas of the outer airbag 110 is discharged to the outside through the opening 111. The inner airbag 120 also has an inner opening 121 communicating with the outer airbag 110 (see FIGS. 3(a)-(b) etc.).
[0038] Next, the internal structure of the airbag 100 will be described. Figure 3(a) to Figure 5 This is a cross-sectional view of the airbag 100 when the front-rear direction of the vehicle is the cross-sectional direction.
[0039] <Implementation Method 1>
[0040] FIG3(a) is a cross-sectional view of the airbag 100 according to the first embodiment.
[0041] As shown in FIG. 3( a ), a first raised portion 112 raised in a first shape (eg, ring shape) is installed on the inner surface of the outer airbag 110 , and a second raised portion 122 raised in a second shape (eg, hook shape) is installed on the outer surface of the inner airbag 120 .
[0042] The first hair raising part 112 and the second hair raising part 122 are configured to be engageable and are formed of a so-called hook and loop fastener. In addition, as long as the first hair raising part 112 and the second hair raising part 122 are engageable, the first shape and the second shape may be the same shape.
[0043] In addition, although the inflation gas supplied from the gas generator is supplied to the two airbags, the outer airbag 110 and the inner airbag 120, respectively, through different supply ports, a discharge port 111 is provided below and at the rear side of the outer airbag 110. The inner airbag 120 has an internal discharge port 121 that is open and communicates with the outer airbag 110, and the inflation gas of the inner airbag 120 is discharged to the outer airbag 110 from the internal discharge port 121.
[0044] Therefore, the inflation gas in the outer airbag 110 escapes to the outside more easily than the inflation gas in the inner airbag 120, and the internal pressure of the inflated outer airbag 110 is lower than the internal pressure of the inflated inner airbag 120, and the shape of the inflated outer airbag 110 can be deformed by collision with the protected object.
[0045] In addition, regarding the inner airbag 120 , the inflation gas of the inner airbag 120 flows into the outer airbag 110 through the inner discharge port 121 and is discharged to the outside from the discharge port 111 . Therefore, the shape of the inflated inner airbag 120 may also be deformed by the collision with the protected object.
[0046] As described later, when the shape of the inflated outer airbag 110 can be deformed by collision with the protected object, the first raised portion 112 installed on the inner surface of the outer airbag 110 rubs against the second raised portion 122 installed on the outer surface of the inner airbag 120, generating a friction force greater than the friction force generated by flatly overlapping the base fabrics of the outer airbag 110 and the inner airbag 120, i.e., the synthetic fiber fabric, thereby suppressing the sliding caused by the outer airbag 110 when the protected object collides with the vehicle and more effectively absorbing the impact itself.
[0047] In the first embodiment, the first raised portion 112 is installed on substantially the entire area of the inner surface of the outer airbag 110, and the second raised portion 122 is installed on substantially the entire area of the outer surface of the inner airbag 120; however, in the side view of the vehicle, the first raised portion 112 may be installed on a specific portion other than the lower portion located below the outer airbag 110 and the inner airbag 120; in the front view of the vehicle, the second raised portion 122 may be installed on the central portion of the outer airbag 110 and the inner airbag 120. It is desirable that at least the specific portion and the central portion are portions of the airbag 100 that are easily contacted by the protected object.
[0048] In the first embodiment, if at least the shape of the inflated outer airbag 110 can be deformed by collision with the protected object, the inner surface of the outer airbag 110 and the outer surface of the inner airbag 120 will rub against each other, so the inner airbag 120 may not have the inner discharge port 121. This also applies to the second to fourth embodiments described below.
[0049] <Implementation Method 2>
[0050] FIG3(b) is a cross-sectional view of the airbag 100 according to the second embodiment, which is an example in which projections and depressions are provided inside the airbag 100 instead of the hook and loop fastener.
[0051] As shown in FIG. 3( b ), a protruding first convex portion 113 is mounted on the inner surface of the outer airbag 110 , and a protruding second convex portion 123 is mounted on the outer surface of the inner airbag 120 .
[0052] The first convex portion 113 and the second convex portion 123 are made of elastic members such as rubber.
[0053] Even when the inner surface of the outer airbag 110 and the outer surface of the inner airbag 120 rub against each other due to the first convex portion 113 and the second convex portion 123, a friction force greater than the friction force generated by flatly overlapping the base fabrics, i.e., the synthetic fiber fabrics, of the outer airbag 110 and the inner airbag 120 can be generated. Furthermore, since the first convex portion 113 and the second convex portion 123 are elastic members, direct impact forces on the convex portion 123 can be absorbed.
[0054] In the second embodiment, in the side view of the vehicle, the first convex portion installed on the inner surface of the outer airbag 110 and the second convex portion 123 installed on the outer surface of the inner airbag 120 are arranged to be offset in the relative direction. In particular, the first convex portion installed on the inner surface of the outer airbag 110 is arranged to be more offset to the front face side of the airbag 100 than the second convex portion 123 installed on the outer surface of the inner airbag 120.
[0055] Therefore, when the protected object falls toward the engine hood 3 together with the airbag 100 after being protected by the airbag 100 in a collision, the biased configuration of the first protrusion 113 and the second protrusion 123 allows the first protrusion 113 and the second protrusion 123 to rub more effectively, thereby effectively generating friction force.
[0056] In the second embodiment, the projections are mounted on both the inner surface of the outer airbag 110 and the outer surface of the inner airbag 120 , but the first projection 113 may be mounted only on the inner surface of the outer airbag 110 , or the second projection 123 may be mounted only on the outer surface of the inner airbag 120 .
[0057] In the second embodiment, the first convex portion 113 and the second convex portion 123 are arranged to be offset in the relative direction between the first convex portion 113 and the second convex portion 123, respectively, but the first convex portion 113 and the second convex portion 123 may not be offset in the relative direction between the first convex portion 113 and the second convex portion 123. Furthermore, the first convex portion 113 and the second convex portion 123 may be arranged to be mounted on specific portions other than the lower portions located below the outer airbag 110 and the inner airbag 120 in the side view of the vehicle, or may be arranged to be mounted on substantially the entire area of the inner surface of the outer airbag 110 and the outer surface of the inner airbag 120.
[0058] In addition, in embodiment 2, the first protrusion 113 and the second protrusion 123 are composed of elastic components such as rubber, but the first protrusion 113 and the second protrusion 123 may not be composed of elastic components, but may be composed of thermal expansion components that are mixed with foaming agents such as polypropylene, sodium bicarbonate, ammonium carbonate, diazoaminobenzene (ジアゾアミノベンゼン), and dinitrosopentamethylenetetramine (ジニトロソペンタメチレンテトラMIN) and expand by the heat of the expanding gas.
[0059] By forming the first convex portion 113 and the second convex portion 123 from a heat-expandable member in this manner, the heat of the expansion gas supplied from the gas generator can be used to make the convex portion 123 larger, thereby generating a greater frictional force.
[0060] <Implementation Method 3>
[0061] Figure 4 This is a cross-sectional view of an airbag 100 according to Embodiment 3, and is an example in which a small bag is provided inside the airbag 100 instead of the hook and loop fastener.
[0062] like Figure 4 As shown, a small bag body 124 smaller than the outer airbag 110 is mounted on the outer surface of the inner airbag 120 .
[0063] The small bag body 124 is provided with an intake port 125 for taking in the inflation gas supplied to the inside of the inner airbag 120. By taking in the inflation gas from the intake port 125, the small bag body 124 is inflated.
[0064] Even with the small bag body 124, when the inner surface of the outer airbag 110 and the outer surface of the inner airbag 120 rub against each other, a friction force greater than the friction force generated by flatly overlapping the base fabrics, i.e., synthetic fiber fabrics, of the outer airbag 110 and the inner airbag 120 can be generated.
[0065] In the third embodiment, as a portion that is easily touched by the protected object, the small bag body 124 is attached to a specific portion other than the lower portion located below the inner airbag 120 in the side view of the vehicle.
[0066] In the third embodiment, the small bag 124 is mounted on a specific portion of the outer surface of the inside airbag 120 in a side view of the vehicle, but may be mounted on substantially the entire outer surface of the inside airbag 120 .
[0067] <Implementation Method 4>
[0068] Figure 5 This is a cross-sectional view of the airbag 100 according to the fourth embodiment, and is an example in which a tether for restricting the deployment direction of the airbag 100 is provided.
[0069] like Figure 5 As shown, a first belt-shaped tether 130 is provided outside the airbag 100, one end of which is connected to the vehicle 1 and the other end is connected to the outer surface of the outer airbag 110. In addition, a second belt-shaped tether 140 is provided inside the airbag 100, one end of which is connected to the inner surface of the outer airbag 110 and the other end is connected to the outer surface of the inner airbag 120.
[0070] The first tether 130 is attached to the outside of the airbag 100 above the outer airbag 110 and the inner airbag 120 at an angle that gradually decreases from the rear side toward the front side with respect to the front-rear direction of the vehicle 1 .
[0071] The first tether 130 is located above the outer airbag 110 and the inner airbag 120, and its angle is gradually inclined from the rear side to the front side relative to the front-rear direction of the vehicle 1, thereby preventing the airbag 100 from sagging downward. In addition, the airbag 100 can be restricted from falling downward, but falling toward the hood 3 side.
[0072] The second tether 140 is installed inside the airbag 100 above the outer airbag 110 and the inner airbag 120 at an angle substantially parallel to the deployment direction of the outer airbag 110 (eg, a horizontal line in the vehicle front-rear direction).
[0073] The second tether 140 is angled substantially parallel to the deployment direction of the outer airbag 110 (eg, a horizontal line in the vehicle front-rear direction), and can thus be deployed in substantially the same direction as the deployment direction of the outer airbag 110 .
[0074] Furthermore, in the fourth embodiment, the tethers are provided both outside and inside the airbag 100 , but the tethers may be provided only on one of the outside and inside of the airbag 100 .
[0075] In the fourth embodiment, in the side view of the vehicle, the first raised portion 112 installed on the inner surface of the outer airbag 110 and the second raised portion 122 installed on the outer surface of the inner airbag 120 are arranged to be offset in relative directions. In particular, the first raised portion 112 installed on the inner surface of the outer airbag 110 is arranged to be more offset to the front face side of the airbag 100 than the second raised portion 122 installed on the outer surface of the inner airbag 120.
[0076] Thus, in the second embodiment as well, the first hair raising portions 112 and the second hair raising portions 122 are more effectively rubbed against each other, and frictional force can be effectively generated.
[0077] In the fourth embodiment, the first raised portion 112 installed on the inner surface of the outer airbag 110 and the second raised portion 122 installed on the outer surface of the inner airbag 120 may not be offset in the relative direction. Furthermore, the first raised portion 112 and the second raised portion 122 may be configured to be installed in specific portions other than the lower portions located below the outer airbag 110 and the inner airbag 120 in the side view of the vehicle, or may be configured to be installed in substantially the entire area of the inner surface of the outer airbag 110 and the outer surface of the inner airbag 120.
[0078] <Deformation transfer of airbag>
[0079] 6( a ) and 6 ( b ), a description will be given of a structure in which the airbag 100 of the above first to fourth embodiments can more effectively absorb the impact when the protected object collides with the vehicle 1 .
[0080] FIG. 6( a ) and FIG. 6( b ) are schematic diagrams showing the deformation transition of the airbag 100 when a protected object collides with the airbag 100 .
[0081] As shown in FIG. 6( a ), when the protected object collides with the vehicle 1 , the protected object collides with the airbag 100 first, and the impact force from the protected object causes the shape of the airbag 100 to deform.
[0082] At this time, the inner surface of the outer airbag 110 and the outer surface of the inner airbag 120 rub against each other.
[0083] Moreover, when the inner surface of the outer airbag 110 rubs against the outer surface of the inner airbag 120, as shown in Figures 6(a) and (b), inside the airbag 100, the first raised portion 112 and the second raised portion 122, the first convex portion 113 and the second convex portion 123, or the small bag body 124 will generate a friction force greater than the friction force generated by flatly overlapping the base fabrics of the outer airbag 110 and the inner airbag 120, i.e., the synthetic fiber fabric.
[0084] As a result, it is possible to suppress sliding of the outer airbag 110 when the protected object collides with the vehicle, and to more effectively absorb the impact, thereby reducing damage to the protected object.
[0085] <Other Modifications>
[0086] In the above-described first to fourth embodiments, the airbag that is deployed and inflated toward the front side of the vehicle 1 is only one of the airbags 100 that generates a large friction force inside the airbag, but another airbag may be provided.
[0087] For example, Figure 7 As shown, a thin semi-elliptical or rectangular airbag 200 may be deployed toward the front side of the vehicle 1 and below the airbag 100 .
[0088] In addition, the front end of the airbag 200 is deployed further forward than the front end of the airbag 100 relative to the front and rear direction of the vehicle. In addition, the upper end of the airbag 200 is deployed at a height below the knee of the protected person. Thus, the airbag 200 can play a role of sweeping the legs of the protected person.
[0089] Moreover, the airbag 100 further has an airbag 200, whereby the airbag 200 first sweeps the legs of the protected object, causing the protected object to fall toward the airbag 100, and then the friction inside the airbag 100 more effectively absorbs the impact of the impact force on the protected object.
[0090] Although there are various collision modes for the protected object, the airbag 200 acting as a sweeping leg can guide the collision mode for the protected object to fall to the side of the airbag 100, and can easily absorb the impact according to the collision mode assumed in advance.
[0091] As described above, the airbag device E of the present invention can suppress the sliding of the airbag 100 when the protected object collides with the vehicle, and can more effectively absorb the impact itself, thereby reducing the damage to the protected object.
Claims
1. An airbag device, characterized in that: have: an outer airbag that is deployed and inflated toward the outside of the vehicle and is composed of a base fabric; and an inner airbag, which is deployed and inflated inside the outer airbag and is composed of a base fabric, Wherein, in the airbag device, a friction generating portion is provided on at least one of the inner surface of the outer airbag or the outer surface of the inner airbag, and when the inner surface of the deployed outer airbag contacts the outer surface of the inner airbag, the friction generating portion generates a friction force greater than a friction force generated by overlapping base fabrics of the outer airbag and the inner airbag, The internal pressure of the inflated outer airbag is lower than the internal pressure of the inflated inner airbag, The inflated outer airbag can be deformed by collision with a protected object to be protected from a vehicle collision. The friction generating portion has a convex portion that induces friction on both the inner surface of the outer airbag and the outer surface of the inner airbag, and the friction generating portion is configured in a side view of the vehicle to be offset in the relative direction between a first convex portion installed on the inner surface of the outer airbag and a second convex portion installed on the outer surface of the inner airbag.
2. The airbag device according to claim 1, characterized in that: At least one of the outer airbag and the inner airbag has a deployment restricting member that restricts a deployment direction of the outer airbag or the inner airbag.