JP2000255359A - Vehicular air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost and a commodity control cost by commonly using a base even when a type is different by storing an air bag inflating by a pressure fluid blown out of an inflater by being joined to a flange part by a guide member. SOLUTION: In a vehicular air bag 10, a cylinder type inflater 12 for blowing out a pressure fluid is held by a base 11, and a pressure fluid introducing opening edge part 13a of the air bag 13 is positioned between the base 11 and a guide member 14 for storing the air bag 13 by being fixed to the base 11. In the base 11 for forming the whole cross section in an almost inverse Ω shape by having an opening groove 11d extending in the lengthwise direction, a cylinder part 11a for surrounding the inflater 12 and flange parts 11b, 11c expansively opening in an inclined shape from both ends of the cylinder part 11a are integrally formed. Thus, a leg part 22a of an air bag lid 22 installed on a resin panel type instrument panel 21 can be applied to the vehicular air bag 10 engaged with a hook 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle airbag provided with an airbag which is inflated by a pressure fluid ejected from an inflator held on a base.

[0002]

2. Description of the Related Art Conventionally, a vehicle provided with a cylindrical inflator for ejecting a pressure fluid, a base for surrounding the inflator and a guide member mounted on the base and containing an airbag. Airbags are known.

On the other hand, such an airbag for a vehicle is, for example, a type which is built into an instrument panel in a vehicle compartment, but which protrudes from the upper surface of the instrument panel, or which is substantially in front of the instrument panel. There is a type that swells.

There are various types of types that swell from the upper surface of the instrument panel, depending on the shape and size of the instrument panel, and the mounting position and the structure due to the difference in the body structure of the vehicle body.

[0005]

By the way, as described above, various types of vehicle airbags are prepared depending on the mounting position and the structure due to the difference in the shape and size of the instrument panel or the structure of the vehicle body. Therefore, it is necessary to manufacture a base having a size and a shape corresponding to the type, and there has been a problem that manufacturing costs and product management costs rise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a vehicle airbag that can share a base even when different types are used and can reduce manufacturing costs and product management costs. The purpose is to:

[0007]

Means for Solving the Problems In order to achieve the object, the invention according to claim 1 has an inflator for ejecting a pressurized fluid, a cylindrical portion surrounding the inflator, and is provided at both ends of the cylindrical portion. A base having a substantially Ω-shaped cross section integrally having a flange portion extending in the direction, and a guide member that accommodates an airbag that is coupled to the flange portion and that is inflated by pressure fluid ejected from the inflator. Make a summary.

According to a second aspect of the present invention, the guide member is divided between the flanges.

According to a third aspect of the present invention, the gist of the present invention is to expand the flange portion in an inclined manner.

According to a fourth aspect of the present invention, the base is fixed to the vehicle body via a bracket which is fixed at at least two places, and a line connecting a vehicle body fixing point of the bracket and a center of gravity of the inflator is formed by the bracket. The point is that it is located in a line connecting the vehicle body fixing point and each of the two fixing points to which the base is fixed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vehicle airbag according to the present invention will be described with reference to the drawings.

6 and 7, reference numeral 1 denotes a steering member which forms a part of the vehicle body and has a weld nut 2 welded and fixed, 3 denotes a bracket fixed to the steering member 1 by bolts 4, and 10 denotes a bracket held by the bracket 3. Vehicle airbag.

The vehicle airbag 10 includes a base 11 fixed to the fixed flange portions 3a and 3b of the bracket 3 by spot welding, a cylinder-type inflator 12 held by the base 11 and ejecting a pressurized fluid, and a base 11 And a retainer 15 held on the base 11 such that the pressure fluid introduction opening edge 13a of the airbag 13 is located between the guide member 14 and the guide member 14. I have.

As shown in FIGS. 5A and 4, the base 11 has a cylindrical portion 11a having a polygonal cross section so as to surround the inflator 12, and a slanted shape from both ends of the cylindrical portion 11a. The flanges 11b and 11c are integrally formed, and the whole cross section has an inverted Ω shape so as to have an opening groove 11d extending in the longitudinal direction.

Near the flange portion 11c of the cylindrical portion 11a,
An emboss 11e projecting outward is formed for positioning with the fixed flange portion 3b.

When the base 11 is fixed to the bracket 3, the emboss 11e is used for temporarily fixing the fixing flange portion 3b and the base 11 in a state where the emboss 11e is engaged with a positioning hole (not shown) of the bracket 3 and positioned. Is performed at one location, and thereafter, a plurality of locations are automatically spot-welded by a jig. Thereby, it is possible to cope with the type of the bracket 3 and to reduce the manufacturing cost. Also,
As shown in FIG. 5B, the embossed portion 11e is provided on the outer wall surface side of the cylindrical portion 11 with respect to the concave width P1 formed on the inner wall surface side of the cylindrical portion 11a in order to prevent the occurrence of cracks during processing. The convex width P2 is narrowed. This can be achieved by making the punch width P1 'wider than the press die width P2', as shown in FIG. 5 (C).

Further, the cylindrical portion 1 located in the pressure fluid discharge direction.
A plurality of reinforcing beads 11f are formed at the boundary between the flange 1a and the flange 11c. Further, the cylindrical portion 11a
Near the flange portion 11b, a concave portion 11 for bolt escape
g is formed. In addition, each flange portion 11b, 11
A bolt insertion hole 11h is formed in c. The base 11 includes, for example, a flange portion 11b including a part of the cylindrical portion 11a and a flange portion 1 including another part of the cylindrical portion 11a.
1c, and another part may be attached to one of the flange portion 11b and the flange portion 11c in accordance with the type of the vehicle airbag 10, and a part of the base 11 may be shared.

As shown in FIG. 3, the guide member 14 is divided into a first guide member 16 having a peripheral wall 16a rising from the flange portion 11b side and a second guide member 17 having a peripheral wall 17a rising from the flange portion 11c side. Have been.

The first guide member 16 extends from the base of the peripheral wall 16a and abuts against the flange 11b, and extends from the abutment flange 16b and straddles between the flanges 11b and 11c. It has a bottom wall portion 16c and a contact flange portion 16d that contacts the flange 11c. Further, a bolt insertion hole 16e corresponding to the bolt insertion hole 11h is formed in the contact flange portions 16b and 16d. Further, a plurality of openings 16f for discharging the pressure fluid are formed in the low wall portion 16c. Moreover, the surrounding wall 16
Side walls 16g are bent at both ends in the longitudinal direction of "a".

The second guide member 17 has a contact flange 17b extending from the base of the peripheral wall 17a and overlapping the contact flange 16d. Further, the bolt insertion hole 1 of the flange portion 11c is formed in the contact flange portion 17b.
A bolt insertion hole 17c corresponding to 1h is formed.
Further, side walls 17d are bent at both longitudinal ends of the peripheral wall 17a.

The retainer 15 is stamped and bent into a rectangular shape in a front view and a W-shape in a side view by a transfer press. The discharge portion 15b and the fixed flange portion 15c overlapping the contact flange portion 17b are integrally formed. An opening 15d is formed in the emission portion 15b so as to open the opening 16f. Further, the fixed flange portions 15a, 15
The bolt 18c is provided with a bolt 18 passing through the bolt insertion holes 16e, 17c, and 11h.

In the above configuration, the vehicle airbag 1
Reference numeral 0 denotes a state in which the base 11 is fixed to the bracket 3 by spot welding, the inflator 12 is held by the base 11, and the guide member 14, the pressure fluid introduction opening edge 13a of the airbag 13 and the retainer 15 are stacked in this order. A nut 19 is screwed and fixed to the bolt 18 of the retainer 15.

When the pressurized fluid is ejected by the operation of the inflator 12, the pressurized fluid is introduced into the airbag 13 through the supply opening 11d and the openings 16f, 15d.
3 begins to expand.

By the way, the vehicle airbag 10 of the present invention.
The base 11 has an inverted Ω-shaped cross section as a whole.

Therefore, for example, as shown in FIG. 1, the hook 20 is fixed to the guide member 14, and the leg 22a of the air bag grid 22 attached to the instrument panel 21 made of a resin panel is engaged with the hook 20. Application to the combined vehicle airbag 10 is possible.

As shown in FIG. 2, an airbag lid 24 is fixed to an instrument panel 23 having a pad, and the vehicle airbag 1 having only the steering member 1 is provided.
Application to the vehicle airbag 10 in which 0 is fixed is also possible. In the case of this type, a wrapping member 25 for preventing foreign matter from entering is attached to the open end of the guide member 14.

Further, as shown by the dashed line in FIG. 2, the present invention can be applied to a device equipped with guide members 14 'of different sizes.

As described above, the vehicle airbag 1 of the present invention
In the case of 0, one type of base 11 can support various types and sizes.

Further, as shown in FIG.
P1 is the center of gravity of P1, P2 is the center of the bracket 3
When the spot welding positions of the base 11 to the fixed flange portions 3a and 3b are P3 and P4, a line connecting the center of gravity P1 and the center P2 is connected between the spot welding position P3 and the center P2 and the spot welding position P4 and the center P2. Since it is located between the lines, in particular, even in the case of the vehicle airbag 10 having no engagement relationship with the airbag lid 24 as shown in FIG. 2, a stable fixed state can be maintained.

[0030]

As described above, the airbag for a vehicle according to the present invention has an inflator for ejecting a pressurized fluid and a tubular portion surrounding the inflator, and extends outward from both ends of the tubular portion. By providing a base having a substantially Ω-shaped cross-section integrally having an extending flange portion, and a guide member that houses an airbag that is coupled to the flange portion and that is inflated by pressure fluid ejected from the inflator, the type is provided. The base can be shared even in the case of different products, so that manufacturing costs and product management costs can be reduced.

Further, by dividing the guide member between the flanges, the range in which the base can be shared can be expanded.

In addition, since the flange portion is expanded in an inclined manner, positioning and handling of the guide member can be easily performed.

In addition, the base is fixed to the vehicle body via a bracket fixed at at least two places, and a line connecting the vehicle body fixing point of the bracket and the center of gravity of the inflator is formed by the vehicle body fixing point of the bracket and the base. Is located in the line connecting the two fixed points with the fixed position, it is possible to maintain a stable fixed state.

[Brief description of the drawings]

FIG. 1 shows a vehicle airbag according to an embodiment of the present invention, and is a cross-sectional view of the vehicle airbag in use.

FIG. 2 is a cross-sectional view of the vehicle airbag in another use state.

FIG. 3 is an exploded perspective view of a main part.

FIG. 4 is a front view of the base.

5A is a cross-sectional view of a base, FIG. 5B is a cross-sectional view in which a part of the base is enlarged, and FIG. 5C is an explanatory view showing an example of embossing.

FIG. 6 is a longitudinal sectional view of the vehicle airbag in a state where the vehicle body is fixed.

FIG. 7 is a perspective view of the vehicle airbag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Airbag for vehicles 13 ... Airbag 11 ... Base member 11a ... Cylindrical part 11b ... Flange part 11c ... Flange part 12 ... Inflator 14 ... Guide member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuji Ikeda 2-1910 Nisshin-cho, Omiya-shi, Saitama F-term (reference) 3D054 AA14 BB10 BB13 FF20

Claims (4)

[Claims] An inflator for injecting a pressure fluid, a base having a substantially Ω-shaped cross section integrally including a cylindrical portion surrounding the inflator and flange portions extending outward from both ends of the cylindrical portion; And a guide member which accommodates an airbag which is connected to a portion and is inflated by the pressurized fluid ejected from the inflator. 2. The vehicle airbag according to claim 1, wherein said guide member is divided between said flanges. 3. An airbag for a vehicle according to claim 1, wherein said flange portion is expanded in an inclined manner. 4. A base body is fixed to a vehicle body via a bracket fixed at at least two places, and a line connecting a vehicle body fixing point of the bracket and a center of gravity of the inflator is formed between the vehicle body fixing point of the bracket and the base. The vehicle airbag according to claim 1, wherein the airbag is positioned within a line connecting the two fixing points to which each of the fixing points is fixed.