JP2017214015A - Air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag that improves a shock absorbing characteristics while inflating and expanding along a shape of the head of an occupant.SOLUTION: An air bag main body part 11 comprises a plurality of second inflating parts 25 extending radially along a prescribed direction. Each inflating part 25 is formed so that an edge part thereof along an extending direction bends in a wave shape. Edge parts of the second inflating parts 25 and 25 adjacent to each other form complementary shapes. The edge parts of the second inflating parts 25 and 25 adjacent to each other are connected integrally to each other. The air bag main body part 11 can be inflated and expanded along the shape of the head A of an occupant. Bottoming between the second inflating parts 25 and 25 is inhibited and thereby a shock absorbing stroke is secured, so that shock absorbing characteristics can be improved.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an airbag including a plurality of inflating portions.

  2. Description of the Related Art Conventionally, a head protection airbag device that deploys an airbag at a position of the back of the occupant seated on a vehicle seat is known as an airbag device including an airbag that is inflated and deployed by introducing gas.

  And as an airbag of such an airbag device, for example, a main airbag that is folded and stored on both right and left sides of the headrest of the seat, and a secondary airbag that is folded and stored on the top of the headrest, At the time of a collision such as a vehicle, the left and right main airbags are inflated forward by the gas supplied from the inflator and deployed from the side of the occupant's head to the front, and joined to each other in front of the occupant's head, A configuration is known in which the auxiliary airbag is inflated slightly behind these main airbags and is deployed above the head of the occupant (see, for example, Patent Document 1).

  In addition, for example, a plurality of radially extending extensions are formed apart from each other, and a bag-like airbag is formed by folding the extensions together at the spaced apart parts and folding them back to the back of the head. There is known a configuration in which an extended portion bulged by a gas supplied from an inflator is curved and deployed into a predetermined shape so as to wrap the occupant's head from behind in the event of a vehicle collision or the like (for example, a patent) Reference 2).

  However, in each of the above-described configurations, the joint between the main airbag and the sub-airbag and the joint between the extended portions are formed in a straight line, so that the shock absorption characteristics at the joints are reduced. A separate configuration is required to suppress the decrease.

JP 2013-18378 A (page 3-5, FIG. 1-5) German utility model No. 20142014003584 (page 5-6, FIG. 1-4)

  As described above, it is desired that the airbag is inflated and deployed in a shape that conforms to the shape of the object to be protected, and the impact absorption characteristics are improved.

  This invention is made | formed in view of such a point, and it aims at providing the airbag which improved the impact-absorbing characteristic, expanding and developing along the shape of a to-be-protected object.

  The airbag according to claim 1 is an airbag including a bag-shaped airbag main body portion that is folded and stored and that protects an object to be protected by inflating and deploying by introduction of gas. The portion includes a plurality of extended inflatable portions that are radially extended in a predetermined direction and expand by introduction of gas, and each of the extended inflatable portions is formed by bending an edge along the extending direction into a wave shape. In addition, the edges of the extending and expanding portions adjacent to each other have a complementary shape, and these edges are integrally joined to each other.

  According to a second aspect of the present invention, in the airbag according to the first aspect, the airbag includes a main body inflating portion that is inflated by introduction of gas, and each extending inflating portion radially extends in a predetermined direction with respect to the main body inflating portion. The gas is introduced from the main body expansion portion and expands.

  According to a third aspect of the present invention, in the airbag according to the second aspect, the main body inflating portion and the extending inflating portion are integrally woven into a bag.

  According to the airbag according to claim 1, the airbag main body portion is provided with a plurality of extending inflatable portions extending radially in a predetermined direction side, and the edge portion along the extending direction of each extending inflatable portion is provided. When the gas is introduced, the extended inflated portions are bent in a wave shape so that the edges of the adjacent inflated expanded portions are complementary to each other and are joined together. The airbag body part can be inflated and deployed along the shape of the object to be protected so as to wrap the object to be protected, and a linear non-inflatable part is provided between the edges of the adjacent inflating parts. It is possible to suppress the formation, suppress the bottoming between the adjacent extended expansion portions, secure the shock absorption stroke, and improve the shock absorption characteristics.

  According to the airbag of the second aspect, in addition to the effect of the airbag of the first aspect, the extending inflated portions are radially extended in the predetermined direction side with respect to the main body inflating portion that is inflated by introducing the gas. By extending the main body inflating part, each extending inflating part inflates and collapses with respect to the main body inflating part, so that the airbag main body part is protected by the main body inflating part and the extending inflating part. Can be expanded and deployed more reliably along the shape of the object to be protected.

  According to the airbag of the third aspect, in addition to the effect of the airbag of the second aspect, leakage of the introduced gas can be suppressed by integrally weaving the main body inflating portion and the extending inflating portion. The internal pressures of the main body expansion part and the extension expansion part can be appropriately maintained.

It is a front view which shows the expansion | deployment state of the airbag of one embodiment of this invention. (A) is a top view of the airbag in a deployed state, and (b) is a side view of the airbag in a deployed state. It is a vertical side view which shows an airbag same as the above schematically. It is a top view which shows typically the base fabric which comprises an airbag same as the above.

  Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIGS.

  1 to 4, reference numeral 10 denotes an airbag, and an airbag device provided with the airbag 10 protects a passenger's head A, which is a protected object of an automobile as a vehicle that is a moving body. A protective airbag device. In the present embodiment, the airbag device is disposed inside a rear parcel board or a headrest of a rear seat as an installed portion located behind the head A of an occupant seated after being a seat of an automobile, for example. This is a rear windshield airbag device. Hereinafter, the front-rear direction (arrow F direction and arrow R direction), both side directions, and the up-down direction (arrow U direction and arrow D direction) are based on the straight direction of the automobile when the airbag device is attached to the automobile, respectively. Will be described.

  The airbag device can be called an airbag module, and supplies gas to the airbag body 11 in addition to the airbag 10 having the airbag body 11 which is a bag-like outer shell. An inflator (not shown), a case body (not shown) to which the airbag 10 and the inflator are attached, a retainer (not shown), a cover body (not shown) that covers the airbag 10 before deployment, a control means (not shown) that controls the operation of the inflator, and the like It has. Furthermore, this airbag apparatus is attached to the instrument panel part of a motor vehicle, and is electrically connected to the control apparatus provided with the sensor etc., and is comprised.

  The case body is formed in a substantially box shape, the upper side toward the rear glass is a rectangular projecting opening that is an opening, and the inner side is an airbag storage portion that stores the folded airbag body 11 (airbag 10). Has been. And this protrusion is normally covered with the cover body.

  The inflator includes a main body having a disk shape or a cylindrical shape, and a gas injection port (not shown) is formed on the outer peripheral surface of the main body. The igniter and the medicine are accommodated inside the main body, and the igniter burns the medicine by the electrical signal from the control means transmitted via the connected connector, and the gas for expansion is supplied from the gas injection port. Is being supplied rapidly.

  The retainer is provided along the shape of the inflator and attaches the inflator together with the airbag main body 11 (airbag 10).

  The cover body is formed integrally with or separately from the rear parcel board or the headrest, and a tear line that is thinner than other portions and easily breaks is formed.

  The airbag main body 11 is formed into a bag shape as a whole by joining a single or a plurality of base fabrics by sewing, bonding or welding, and the occupant's head A from the rear in a deployed state. Unfold to wrap. In the present embodiment, the airbag main body 11 is formed by weaving a so-called One Piece Woven (OPW) with a single base fabric 20 using a jacquard loom (not shown). The gas leakage from the sewing portion is small and the internal pressure can be effectively maintained. The airbag body 11 is integrally provided with an inflating part 21 and a gas introducing part 22 into which gas is introduced. The inflatable portion 21 is provided with a first inflatable portion 24 as a quadrilateral main body inflating portion having a longitudinal direction in the vehicle width direction, and a plurality of, for example, six, radially projecting from the first inflatable portion 24. The second inflating part 25 as the extending inflating part is integrally set, and the second inflating parts 25 are joined to each other by the joining part 26.

  The base fabric 20 is located on the occupant facing portion 31 as a protected portion facing portion that forms the front side facing the occupant's head A in the deployed state of the airbag body portion 11, and on the back side of the occupant facing portion 31. It is a joint part that is integrally provided with a vehicle body facing part 32 that faces the vehicle body side (rear windshield) when the airbag main body part 11 is deployed, and that connects the passenger facing part 31 and the vehicle body facing part 32 to the outer edge. A seam allowance 33 is set. The passenger facing portion 31 and the vehicle body facing portion 32 are formed in substantially the same shape.

  The first expansion part 24 is an air chamber into which gas is directly introduced from the gas introduction part 22 via an inflator. The first inflating portion 24 is a portion that is developed so as to have a thickness in the front-rear direction by the introduced gas. The first inflating portion 24 is formed in a longitudinal shape in the left-right direction that is the vehicle width direction.

  Each second inflating portion 25 is an air chamber into which gas is introduced via the first inflating portion 24. The second inflating portion 25 expands forward with respect to the first inflating portion 24 so as to have a thickness in the vertical direction intersecting (orthogonal) with the thickness direction of the first inflating portion 24 by the introduced gas. Part. The second inflating portion 25 extends radially upward from the upper portion of the first inflating portion 24, which is a predetermined direction. That is, the plurality of second inflating portions 25 extending from each first inflating portion 24 are in the state of the base fabric 20 before being joined by the joining portion 26, from the proximal end side (lower side) to the distal end side ( It is formed at a predetermined opening angle so that the edge distance gradually increases toward the upper side. In other words, these second inflating portions 25 extend in a finger shape with respect to the first inflating portion 24. Here, the opening angle of the adjacent second inflating portions 25 is, for example, an angle between the center lines of the second inflating portions 25. Moreover, in this Embodiment, between the 2nd expansion parts 25 is the notch part 37 in the state of the base fabric 20 before joining by the junction part 26, and 2nd expansion parts 25 mutually separate. Is formed. The edges 25a and 25b along the vertical direction, which is the extending direction (extending direction) of the adjacent second inflating portions 25, are located in the seam allowance portion 33 and are complementary to each other in a wave shape (zigzag shape), that is, approximately It is formed in a curved shape that repeats an S-shape. In other words, the edge portions 25a and 25b of the adjacent second inflating portions 25 and 25 are formed such that one of them protrudes in the left-right direction and the other is recessed in substantially the same shape.

  The joint portion 26 is formed so as to be integrated by sewing or the like in a state where the edge portions 25a and 25b of the second expansion portion 25 are brought close to each other at the position of the sewing margin portion 33 and overlapped. Accordingly, the joint portion 26 is formed in a wave shape (zigzag shape) along the shape of the edge portions 25a and 25b, and is a non-expandable portion that does not expand due to gas. By the joint portion 26, the adjacent second inflating portions 25 are integrated in a state in which they are close to each other in the left-right direction.

  The gas introduction part 22 extends to the lower part of the first expansion part 24, that is, to the side opposite to the second expansion part 25. Therefore, the gas introduction part 22 is provided so as to protrude downward.

  The control means includes a control device including a CPU and a memory, and the control device is connected to the inflator via a signal line to operate the inflator.

  The airbag main body 11 configured in this manner is folded in a predetermined manner and attached to the case body through the retainer together with the inflator, and then fixed to an attachment portion such as a rear parcel board or a headrest. Attached to.

  Next, the deployment operation of the airbag device will be described.

  As an outline of the operation of the airbag device, when the control device operates the inflator and injects gas from the inflator in the event of a collision from the rear of the automobile, the gas is introduced from the gas introduction unit 22 into the airbag body. It flows into the inside of the part 11. Then, the inflated airbag main body 11 breaks the tear line of the cover body and protrudes from the projection opening, and the second inflatable portion 25 is deployed following the first inflatable portion 24.

  At this time, the second inflating part 25 wraps the upper part and both side parts of the occupant's head A from the rear as the gas introduced from the first inflating part 24 passes from the proximal end side to the distal end side. Expand while falling forward. For this reason, the expansion part 21 is adjusted to the shape of the head A (head A), in which the peripheral part (second expansion part 25) is located in front of the center part (first expansion part 24). ) Is deployed between the occupant's head A and the rear windshield or headrest in a rounded solid shape. That is, the inflating portion 21 develops in a pocket shape (half dome shape) with the passenger facing portion 31 on the inside and the vehicle body facing portion 32 on the outside. As a result, the airbag 10 (airbag main body 11) restrains the occupant's head A against an impact from the rear, and protects it from an impact caused by a collision with an interior part or a rear windshield of the occupant's head A. .

  Thus, according to the present embodiment, a plurality of second inflating portions 25 extending radially upward in the predetermined direction are set in the airbag main body portion 11 and each second inflating portion 25 is The edges 25a and 25b along the extending direction are bent in a wave shape so that the edges 25a and 25b of the second inflating parts 25 and 25 adjacent to each other have a complementary shape, and the edges 25a and 25b When the gas is introduced, the second inflating parts 25 are collapsed together so that the airbag main body 11 is wrapped around the head A of the occupant. , And the formation of linear non-expandable portions (zero stroke portions) between the edges 25a, 25b of the adjacent second inflatable portions 25, 25 can be suppressed. If this is the case, the second inflatable portion 25 has no linear region where no reaction force is generated, and at least on the straight line. Can be a reactive force occurs configuration at any position, by suppressing the bottoming of between second expansion portions 25 adjacent secured a shock absorbing stroke can be improved impact absorption properties. Therefore, the head A of the occupant can be reliably protected.

  Further, the first inflating portion 24 expands radially by extending each second inflating portion 25 radially upward in the predetermined direction with respect to the first inflating portion 24 that expands when gas is introduced. Subsequently, each of the second inflatable portions 25 is inflated and falls into the first inflatable portion 24, so that the airbag main body 11 is moved to the occupant by the first inflatable portion 24 and each of the second inflatable portions 25. The head A can be inflated and deployed more reliably along the shape of the head A of the passenger.

  Moreover, a plurality of inflators are not used, and the weight of the airbag 10 does not increase more than necessary, and can be manufactured at low cost and light weight.

  In addition, the first inflatable portion 24 and the second inflatable portion 25 are integrally woven by a one-piece woven method so that leakage of gas introduced into the inflatable portion 21 can be suppressed. The internal pressure of the second expansion part 25 can be appropriately maintained.

  Furthermore, the amount of collapse of the second expansion part 25 can be set only by adjusting the opening angle of the second expansion parts 25 and 25 adjacent to each other. Specifically, as the opening angle of the second inflating portions 25, 25 is increased, the amount of the second inflating portion 25 that falls forward can be increased. Therefore, the amount of collapse of the second expansion portion 25 can be easily adjusted, and the manufacturing cost can be reduced.

  Further, by changing the corrugated pitch of the edges 25a and 25b of the second inflating portions 25 and 25 adjacent to each other (pitch of the joint portion 26), that is, by changing the interval between the corrugated ridges, The volume (swelling) of the inflating part 25 can be set. Specifically, the volume of each second inflatable portion 25 is increased as the corrugated pitch of the edge portions 25a and 25b of the second inflating portions 25 and 25 adjacent to each other is increased. be able to. Therefore, the joint portion 26 that joins the edges 25a and 25b of the second expansion portions 25 and 25 can function as a tether that can easily adjust the volume of the second expansion portion 25.

  In the above-described embodiment, the wave shapes of the edges 25a and 25b of the second inflating portion 25 may be a constant size, or gradually change from the proximal end side to the distal end side to increase the size. It may change.

  In addition, the adjacent second inflating portions 25, 25 are notched portions 37 in a state before being joined by the joining portion 26, but the base fabric 20 may be disposed in the form of a scraper. In this case, the edges 25a and 25b are joined in a state where the edges 25a and 25b are overlapped with each other and curved so as to loop the scooping portion. In this configuration, a portion cut from the base fabric 20 can be suppressed and waste can be eliminated.

  Furthermore, the base fabric 20 is not limited to a single bag weave, and the airbag body 11 can be formed into a bag shape by overlapping a plurality of base fabrics and joining the outer edges.

  Further, the first inflating portion 24 is made as small as possible so that the first inflating portion 24 is not substantially provided, and the gas is directly introduced from the gas introducing portion 22 into each of the second inflating portions 25. You can also

  Furthermore, the airbag device is installed not only as a curtain airbag device that is deployed so as to cover the rear windshield in the vehicle interior of the vehicle, but also as an airbag device installed on the headrest of the front seat or outside the vehicle. The present invention is also applicable to a pedestrian protection airbag device or an airbag device for motorcycle or bicycle passengers.

  The present invention can be suitably used as a rear windshield airbag disposed inside a rear parcel board or a headrest of a rear seat.

10 airbag
11 Airbag body
24 1st expansion part as main body expansion part
25 Second expansion part as an extended expansion part
25a, 25b Edge A A passenger's head that is to be protected

Claims (3)

An airbag including a bag-shaped airbag main body portion that is folded and stored and protects an object to be protected by inflating and deploying by introduction of gas,
The airbag main body includes a plurality of extending and inflating portions that are formed radially extending in a predetermined direction and are expanded by introduction of gas.
Each of the extending and expanding portions is formed by bending an edge along the extending direction into a wave shape, the edges of the extending and expanding portions adjacent to each other have a complementary shape, and the edges are An airbag characterized by being integrally joined to each other. A main body inflating part that expands when gas is introduced,
2. The airbag according to claim 1, wherein each extending and inflating portion extends radially in a predetermined direction with respect to the main body inflating portion and is inflated by introducing a gas from the main inflating portion. The airbag according to claim 2, wherein the main body inflating portion and the extending inflating portion are integrally woven into a bag.

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