JP4700425B2 - Side airbag for vehicle - Google Patents

Description

  The present invention relates to a vehicle side airbag.

  A side roof rail is disposed on a portion corresponding to an occupant head in a vehicle body as a vehicle, and a side airbag for protecting an occupant at the time of a side collision is provided along the side roof rail. In this type of side airbag, a bag body having a longitudinal length that covers a side window from a front seat to a rear seat is folded in a vertical direction and stored.

The bag body has an upper end fixed to the side roof rail, and the inflator gas flows into the first chamber of the bag body from a tubular gas inlet formed in a part of the upper portion of the bag body. The first chamber can be expanded and the second chamber can also be expanded by the gas that has permeated through the breathable panel, so that the chamber can be expanded downward (for example, Patent Document 1).
Japanese Patent Laid-Open No. 2004-210257

  However, in such a conventional technique, since the inflation pressure of the inflated and deployed bag body is balanced within the bag body, there is no escape allowance even if the occupant hits the bag body. Neither the room on the side that received the head nor the room on the side that supports the room has a bending allowance, and it is difficult to say that the desired shock energy absorption can be obtained. .

  The present invention has been made by paying attention to such a conventional technique, and provides a vehicle side airbag that can reliably absorb impact energy from the head of an occupant received by an inflated bag body. .

  The invention according to claim 1 is an inner bag made of a non-breathable panel in which a recess is formed between the expansion chambers by the expansion chamber divided by the joint portion and the expansion gas from the inflator can be sealed; A vehicle side airbag comprising an outer bag made of a non-breathable panel that envelops the entire inner bag and is sealed at the periphery, and is always at a position facing the recess of the inner bag. An exhaust hole is provided that is closed by the outer bag and opens when the inner bag reaches a predetermined inflation pressure.

  The invention according to claim 2 is the vehicle side airbag according to claim 1, wherein the expansion chamber has a front-rear dimension of 145 to 160 millimeters, and the exhaust hole is formed at a substantially center of the expansion chamber. It is formed.

  According to the first aspect of the present invention, the inner bag is formed of a non-breathable panel in which a recess is formed between the expansion chambers by the expansion chamber divided by the joint portion and the expansion gas from the inflator can be sealed. And an outer bag made of a non-breathable panel that encloses the entire inner bag and the periphery is sealed and joined, and is located at a position facing the recess of the inner bag, It is normally closed by the outer bag and is provided with an exhaust hole that opens when the inner bag reaches a predetermined inflation pressure, so that the inflation gas that has entered the expansion chamber of the inner bag is closed by the outer bag. Smooth expansion is possible. When the passenger's head hits the side airbag, the inflation gas filled in the expansion chamber lifts the outer bag by the pressure applied to the expansion chamber and flows into the recess, thereby reducing the expansion pressure in the expansion chamber. Thus, the impact energy is surely absorbed.

  According to the second aspect of the present invention, since the front-rear dimension of the expansion chamber is 145 to 160 millimeters, most of the head of an occupant can be reliably supported by the expansion chamber, and the exhaust hole is provided with the expansion chamber. Therefore, the expansion gas can be smoothly extracted from the expansion chamber.

  For the purpose of providing a vehicle side airbag that can reliably absorb impact energy from the head of an occupant received by the inflated bag body, a recess is formed between the expansion chambers by the expansion chamber divided by the joint portion. And an inner bag made of a non-breathable panel that can enclose the inflation gas from the inflator, and an outer bag made of a non-breathable panel that encloses the entire inner bag and is sealed around the inner bag. In the vehicle side airbag, a position facing the recess of the inner bag is provided with an exhaust hole that is normally closed by the outer bag and opens when the inner bag reaches a predetermined inflation pressure. That was realized. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 4 are diagrams showing an embodiment of the present invention.

  Reference numeral 1 denotes a vehicle side airbag capable of protecting the head of an occupant. The vehicle side airbag 1 is folded and housed in a vertical direction on a well-known vehicle body (not shown), so that it can be used when a vehicle side collision occurs. The outer bag 2 can be deployed in a curtain shape downward along the window portion, and the inner bag 3 is covered with the outer bag 2.

  The outer bag 2 is formed by binding the outer periphery of two base fabrics 2a, 2b to a bag shape by stitching after sealing material 18 is applied. A plurality of tab pieces 4 that can be hooked and supported on the upper portion of the vehicle body are provided on the upper portion of the outer bag 2, and a hook 5 that is suspended on a front pillar (not shown) is provided on the front portion (left side in FIG. 1). Yes.

The outer bag 2 covers a front seat side window (side window) of a vehicle (not shown) so as to correspond to a front seat occupant, and a rear seat side window (not shown) The inflating gas G from the inflator, which will be described later, does not flow between the rear seat inflating portion 7 that can accommodate the rear seat occupant by covering the side window, and the front seat inflating portion 6 and the rear seat inflating portion 7. A tubular communication portion 17 having a non-inflow portion 8 and allowing the inflation gas G to pass therethrough is provided between the front seat expansion portion 6 and the rear seat expansion portion 7.

  The inner bag 3 is formed by joining the outer periphery of two base fabrics 3a and 3b in a bag shape by a sewing portion 13. On the rear side of the inner bag 3 (the right side in FIG. 1), there is a gas inlet 9 that allows the inflating gas G to flow from a combustion type (pyro type) inflator. A plurality of expansion chambers 20 are formed by appropriately guiding the expansion gas G introduced into the two base fabrics 3a and 3b by joint portions (stitched portions) indicated by reference numerals 10, 11, 12, and 15. Formed. A concave portion 19 is formed between the expansion chambers 20 and 20 by joint portions 10, 11, 12, and 15 as shown in FIG.

  Reference numerals 14 and 16 are exhaust holes formed at positions facing the recessed portion 19 at the lower part of the front and rear center position of the expansion chamber 20 of the inner bag 3, and the exhaust holes 14 and 16 are as shown in FIG. When the inflating gas G from the inflator flows in, the outer bag 2 is closed along the inner bag 3 and is formed by removing a part of the sewing portion 13. Can be smoothly expanded. When an impact is applied, such as when the head of an occupant collides, the outer bag 2 is temporarily deformed as shown by a two-dot chain line in FIG. 4, and the gas G in the expansion chamber 20 is recessed from the exhaust holes 14 and 16. 19 is allowed to flow out. As shown in FIGS. 1 and 2, the portion where the exhaust holes 14 and 16 are formed has a larger space between the sewing portion 13 and the end portion than the other portions. , 16 for securing the width with the welded portion, so that the cut line does not meander to match the welded portion, but a uniform cut line (FIGS. 1 and 2). The width is increased.

  Therefore, according to this embodiment, a recess 19 is formed between the expansion chambers 20 by the expansion chamber 20 divided by the joint portions 10, 11, 12, and 15, and the expansion gas G from the inflator can be sealed. An inner bag 3 made of non-breathable panels 3a and 3b, and an outer bag 2 made of non-breathable panels 2a and 2b that wraps the entire inner bag 3 and is joined at its periphery by a sealing material 18. The vehicle side airbag 1 is an exhaust that is normally closed by the outer bag 2 at a position facing the recess 19 of the inner bag 3 and opens when the inner bag 3 reaches a predetermined inflation pressure. Since the holes 14 and 16 are provided, the inflation gas G that has entered the expansion chamber 20 of the inner bag 3 closes the exhaust holes 14 and 16 to the outer bag 2. To allow a smooth expansion Because there.

When the occupant's head collides with the side airbag 1, the inflation gas G filled in the expansion chamber 20 is inflated by lifting the outer bag 2 by the pressure applied to the expansion chamber 20 and flowing into the recess 19. The expansion pressure of the chamber 20 is reduced and the impact energy is reliably absorbed.

  Since the front-rear dimension of the expansion chamber 20 is 145 to 160 millimeters, most of the head of the occupant can be reliably supported by the expansion chamber 20, and the exhaust holes 14 and 16 are formed at the approximate center of the expansion chamber 20. As a result, the expansion gas G can be smoothly extracted from the expansion chamber 20.

  The cross-sectional view shown in FIG. 5 is exhaust holes 14 ′ and 16 ′, which are modified examples of the exhaust holes 14 and 16. The exhaust holes 14 ′ and 16 ′ are formed as through holes only in the base cloth 3 a of the inner bag 3. By doing so, it is possible to continuously sew the entire circumference without stopping the sewing portion 13 in the middle, and the manufacturing convenience is good.

The front view of the side airbag which concerns on one Example of this invention. The front view of the inner bag single-piece | unit of the side airbag of FIG. Sectional drawing along the SA-SA line of FIG. Sectional drawing along the SB-SB line | wire of FIG. FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing a modification of the exhaust hole of FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side airbag for vehicles 2 Outer bag 2a, 2b Non-breathable panel of outer bag 3 Inner bag 3a, 3b Non-breathable panel of inner bag 10, 11, 12, 15 Joint part (stitching part)
14, 16, 14 ′, 16 ′ Exhaust hole 18 Sealing material 19 Recess 20 Expansion chamber G Expansion gas

Claims (2)

A recess formed between the expansion chambers by the expansion chamber divided by the joint portion, and an inner bag made of a non-breathable panel that can enclose expansion gas from the inflator, and the entire inner bag is wrapped around the inner bag A vehicle side airbag composed of an outer bag made of a non-breathable panel that is sealed and joined,
A vehicle side airbag characterized in that an exhaust hole that is normally closed by an outer bag and opens when the inner bag reaches a predetermined inflation pressure is provided at a position facing the recess of the inner bag. . The vehicle side airbag according to claim 1,
The vehicle side airbag according to claim 1, wherein the expansion chamber has a front-rear dimension of 145 to 160 millimeters, and the exhaust hole is formed at a substantially center of the expansion chamber.

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