JPH0769151A - Bag body of air bag device - Google Patents

Abstract

PURPOSE:To obtain the bag body of an air bag device which can sufficiently absorb the inertial force of a driver in the lower part of a steering wheel. CONSTITUTION:As for the bag body 24 of an air bag device which is installed on a steering wheel 12 and is expansion-developed by gas and protects a driver, interposed between the steering wheel 12 and a driver, a projection part which partially projects in the radial direction from a part on the outer periphery of the bag body 24 is installed, and serves as a turning-in part 24A which turns-in to the outside of the steering wheel 12 in development.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag body of an airbag device arranged on a steering wheel.

[0002]

2. Description of the Related Art An air bag device is mounted on a vehicle in order to respond to a sudden deceleration of the vehicle such as a collision, and a starting device senses the rapid deceleration of the vehicle to detect a gas generating substance enclosed in an inflator. By burning, the bag expands and expands to intervene between the steering wheel and the occupant,
It is designed to absorb the impact force of passengers.

In this airbag device 100, as shown in FIG. 10, in order to ensure the visibility of the instrument (instrument panel), the center axis P of the inflator is longer than the center axis O of rotation of the steering wheel 102. It is arranged so as to be biased downward by B. Further, an opening 106 is formed in the bag 104, and a peripheral edge of the opening is fixed to a base plate 110 fixed to a hub of the steering wheel 102 with a part of the tip of the inflator 108 being inserted into the opening 106. , It is usually folded and stored in the cover.

By the way, in the conventional bag, as shown in FIG. 9, the expansion length of the opening 106 when viewed from the front is A.
The bag 104, which has a substantially circular shape when viewed from the front, is coaxially provided at the substantially central portion. Therefore, as shown in FIG. 10, when the bag body 104 is inflated and intervenes between the steering wheel 102 and the occupant 112 during sudden deceleration of the vehicle, the steering wheel vertical direction (direction of arrow Q).
In the above, the degree to which the inflated bag body 104 projects outward from the steering wheel 102 (covers the steering wheel) (hereinafter referred to as the bag body extension dimension) is determined by the inflator with respect to the steering wheel rotation center axis O rather than the upper end portion D _2. Approximately 50 to _{1 at the} lower end D ₁ that is elongated by the amount of deviation B (generally about 20 mm) of the central axis P.
It was 00 mm. When such a bag body 104 is used in a vehicle with a column mounting angle θ of 35 ° or more, the degree to which the lower end of the bag body 104 projects outward from the steering wheel 102 in the vehicle body vertical direction (direction of arrow S) (hereinafter, X, which is called the overlap dimension, is less than 50 mm. If this overlap dimension X is small, the bag body 104
The lower part of the occupant is in contact with the vertical line U to the horizontal direction of the vehicle body (arrow R direction), and the occupant contacting part M is above the horizontal line N drawn from the lower part of the steering wheel parallel to the horizontal direction of the vehicle body (arrow R direction). As shown in FIG. 11, the bag body 10 is moved by the inertial movement of the occupant 112 during the rapid deceleration of the vehicle.
4 is the upper part of the steering wheel 102 (direction of arrow T)
Since the vehicle moves toward, the inflation pressure of the bag body must be increased so that the chest of the occupant 112 does not come into direct contact with the steering wheel 102.

[0005]

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to obtain a bag body of an airbag device which is excellent in absorbing an inertial force of an occupant in a lower portion of a steering wheel.

[0006]

A bag body of an airbag apparatus according to claim 1 is attached to a steering wheel,
In a bag body of an airbag device that is inflated and expanded by gas and is interposed between a steering wheel and an occupant to protect an occupant, a protruding portion that partially protrudes in a radial direction from an outer peripheral portion of the bag body is provided, It is characterized by a wraparound part that wraps around the outside of the steering wheel when deployed.

The bag body of the airbag apparatus according to claim 2 is
An opening for fixing to an inflator attached to a steering wheel is formed, the inflator is folded and stored in a state of being fixed to the opening, and gas generated from the inflator flows into the inside through the opening. In a bag body of an airbag device which is inflated and deployed by means of being interposed between a steering wheel and an occupant to protect an occupant, a central portion between one end of the bag body in a deployed state and a central portion to the other end. It is characterized in that the opening is provided eccentrically toward the one end, and the other end is a wrap-around portion that projects to the outside of the steering wheel when the bag body is deployed.

The bag body of the airbag device according to claim 3 is
An opening for fixing to an inflator mounted at a predetermined angle with respect to the horizontal direction of the vehicle body and attached to a steering wheel is formed, and the inflator is folded and stored while being fixed to the opening, and is generated from the inflator. In a bag body of an air bag device which expands and expands when gas flows into the interior through the opening and is interposed between a steering wheel and an occupant to protect the occupant, a perpendicular line to the vehicle body horizontal direction when the bag body is deployed. It is characterized in that the occupant contacting portion that contacts with is below a horizontal line drawn from the lower portion of the steering wheel in parallel with the horizontal direction of the vehicle body.

[0009]

In the bag body of the air bag device according to the present invention, a projecting portion partially projecting from a part of the outer periphery of the bag body is provided, and when the bag body is deployed, that is, when the bag body is inflated or the bag body is opened and expanded. It is a wraparound part that wraps around the outside of the steering wheel when it is turned on. If the bag is attached so that the wraparound portion corresponds to the lower portion of the steering wheel, the wraparound portion protruding from the lower portion of the steering wheel and the overlap dimension have a large column mounting angle even if the column mounting angle is large.
Big enough. Therefore, even when the vehicle suddenly decelerates and the occupant pushes the bag body by inertial movement, the wraparound portion is pushed toward the upper side of the steering wheel and is pushed toward the side opposite to the occupant, and covers the lower portion of the steering wheel. In other words, by increasing the bag body protruding dimension and the overlap dimension, the wraparound portion can be reliably interposed between the occupant and the steering wheel, so that the occupant does not need to increase the inflation pressure of the bag body. It is possible to avoid a direct collision with the steering wheel.

According to a second aspect of the present invention, in the bag body of the airbag device, the opening is provided eccentrically toward the one end from the central portion between the one end and the other end of the bag body in the deployed state. The other end is a wrap-around portion that projects to the outside of the steering wheel when the bag body is deployed. If the bag body is attached so that the wraparound portion corresponds to the lower portion of the steering wheel in the same manner as described above, the bag body protruding dimension and the overlap dimension can be increased, so that the bag body inflation pressure can be increased without increasing. The lower part of the steering wheel can be wrapped around.

In the bag body of the airbag device according to the present invention, the occupant contacting portion which is in contact with the vertical line with respect to the horizontal direction of the vehicle body when the bag body is deployed is more than the horizontal line drawn from the lower portion of the steering wheel in parallel with the horizontal direction of the vehicle body. Is also below. Therefore, when the vehicle body decelerates during sudden deceleration and the passenger presses the bag body by inertial movement, the portion below the horizontal line drawn from the lower portion of the steering wheel does not escape toward the upper portion of the steering wheel. It is pressed against the occupant side. Therefore, the lower portion of the steering wheel can be reliably covered without increasing the inflation pressure of the bag body, and the collision between the occupant and the steering wheel can be avoided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bag body of an airbag device according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 8 is a sectional view of an airbag device 10 to which the bag body 24 of the airbag device according to the present invention is applied.

The airbag device 10 includes a steering wheel 1 mounted at a column mounting angle of 35 ° or more.
It is attached to a hub 13A provided on the second core 13 via a support bracket 16.

The airbag device 10 includes a base plate 14 having a substantially box shape. This base plate 14
A support flange 14 </ b> A is integrally formed on the outer peripheral part of the support flange so as to bend and hang downward in a U-shape toward the side opposite to the occupant. Also,
An inflator 22, an inflator cover 25, an insert plate 28 embedded in an airbag cover 26, and a bag body 24 are attached to the base plate 14.

The inflator 22 has a substantially columnar shape, and a half of the inflator 22 (on the side of the arrow C in FIG. 8) is arranged so as to pass through the circular hole of the base plate 14. A square flange 30 extending in the radial direction of the inflator 22 is formed in the inflator 22 at an axially intermediate portion thereof. Through the flange 30, a bolt or the like (not shown) is provided on the side opposite to the occupant side of the base plate 14 (see FIG. 8). (The direction opposite to the arrow C direction)
Fixed to the surface of. Further, a plurality of gas holes 23 (see FIG. 2) are formed at predetermined intervals on the occupant side peripheral surface of the inflator 22.

Further, the airbag cover 26 has a box shape, and a substantially H-shaped thin portion 40 is formed on the surface facing the occupant.
Are formed. Therefore, when the vehicle suddenly decelerates, the bag body 24
The inflation pressure of the airbag cover 2 along the thin portion 40
6 breaks and expands in the directions away from each other.

The bag body 24 is arranged so as to cover an axially occupant side portion of the inflator 22 in a state of being folded toward the occupant side of the base plate 14. The edge of the bag body 24 on the opening side is attached to a substantially central portion of the base plate 14 via a ring plate 38. The ring plate 38 is fastened to the base plate 14 with a bolt (not shown), and the edge of the bag body 24 on the opening side is pressed against the base plate 14.

A starter 34 that operates when the vehicle is suddenly decelerated is arranged at the axial center of the inflator 22, and a detonator, an explosive agent, and a gas generating agent 36, which are not shown, are accommodated in the outer peripheral portion of the starter 34. There is. Plural kinds of filters (not shown) are arranged between the gas generating agent 36 and the gas holes 23. Therefore, at the time of sudden deceleration of the vehicle, the starter 34 operates to ignite the detonator, and the gas generating agent 36 is burned through the explosive agent to generate a large amount of gas. After the gas has been cooled and debris removed by the filter,
It is guided from the gas holes 23 into the bag body 24. The structure of the bag body 24 will be described below. In the figure, an arrow O indicates the rotation center axis of the steering wheel 12, and an arrow P indicates the center axis of the inflator 22. To ensure the visibility of the instrument panel, the inflator center axis P is the steering wheel rotation center axis O. It is shown that it is biased downwards by a length B.

1 to 3 show a bag body 24 of an airbag device according to a first embodiment of the present invention.

As shown in FIG. 2, the bag body 24 comprises two base cloths 12 made of a cloth material having excellent heat resistance and sealing properties.
The outer peripheral portions 124C and 124D of 4A and 124B are sewn together and turned upside down through the opening 24 side.
As shown in FIG. 1, these base fabrics have an elliptical front shape when viewed from the axial direction of the bag body 24, and only one base fabric 124A of the two base fabrics is used for attaching the inflator 22. The opening 42 is formed. This opening 42 is provided in the peripheral portion of one of the two fixed points of the ellipse,
A portion 24A on the side opposite to the opening 42 in the direction along the longitudinal axis 124E is a protruding portion that protrudes in the radial direction of the bag body 24.

A broken line 44 shown in FIGS. 1 and 2 is a bag body of a conventional airbag device which is inflated into a flat sphere shape and has an inflation length A when viewed from the front centering on the center 42A of the opening 42. Is an imaginary line showing. The length from the lower end portion 44A of the broken line 44 to the lower end portion 24B of the bag body 24 when viewed from the front is α. That is, the bag body 24 in the present embodiment has a configuration in which the lower portion is elongated by the amount of α.

Next, the operation of this embodiment will be described. In a state other than during the rapid deceleration of the vehicle, the starting device 34 maintains the non-operating state, so that no gas is ejected from the inflator 22. Therefore, as shown in FIG. 8, the bag body 24 is housed between the base plate 14 and the airbag cover 26 in the folded state.

When the vehicle suddenly decelerates from this state, the starting device 34 is activated. Therefore, a detonator (not shown) ignites, the gas generating agent 36 burns through the explosive agent, and a large amount of gas is ejected into the bag body 24. Therefore, as shown in FIG. 2, the bag body 24 is inflated toward the occupant while the airbag cover 26 is broken at the thin portion 40 and is expanded.

At this time, as described above, the bag body 24 is
In the vertical direction of the steering wheel (the direction of arrow Q), the expansion length of the lower part as viewed from the inflator central axis P is larger than the expansion length of the upper part by α. Further, as described above, the center axis P of the inflator is offset by the length B below the center axis O of the steering wheel rotation. Therefore, the bag body protruding dimension D _{1 at} the lower portion of the steering wheel 12 becomes longer than the bag body protruding dimension D _{2 at the} upper portion by the deviation amount B plus the lower inflation increase amount α of the bag body 24, and relatively. The overlap dimension X in the vehicle body vertical direction (direction of arrow S) also becomes long.

When the overlap dimension X is set to 50 mm or more, the occupant contact portion M where the lower portion of the bag body 24 contacts the perpendicular line U to the vehicle body horizontal direction (arrow R direction) extends from the lower portion of the steering wheel to the vehicle body horizontal direction (arrow R direction). ), The lower portion 24A (see FIG. 1) of the bag body 24 is pressed by the inertial movement of the occupant 46, as shown in FIG. Is pressed to the side opposite to the occupant (in the direction of arrow V) without moving to the upper part of. That is, the lower portion 24A serves as the wraparound portion 24C, and the lower portion of the steering wheel 12 can be reliably covered. This allows crew 4
There is no direct contact between 6 and the steering wheel 12.

4 and 5 show a bag body 24 according to the second embodiment of the present invention. In the second embodiment, as shown in FIG. 4, with respect to the bag body 24 whose expansion length from the center W of the bag body 24 having a substantially circular shape when viewed from the front is A, the opening 42 is formed. The center 42A is eccentric by the length E. Eccentric axis Y passing through the bag center W and the center 42A of the opening 42
The portion 24D on the side opposite to the opening 42 in the direction along the arrow is a protrusion, and the bag body 24 is attached so as to correspond to the lower portion of the steering wheel 12.

Therefore, when the bag body 24 is inflated, as shown in FIG. 5, the bag body protruding dimension D _{2 at} the upper portion of the steering wheel 12 becomes shorter and the bag body container protruding dimension D _{1 at the} lower portion becomes the bag body protruding dimension. The displacement 42 of the inflator center axis P relative to the steering wheel rotation center axis O relative to D _{2 and} the center 42A of the opening 42 relative to the center W of the bag body 24.
It becomes longer by the amount of deviation E, and the overlap dimension X becomes relatively longer (50 mm or more).

Therefore, the portion 24D of the bag body 24 on the side opposite to the opening 42 serves as the wraparound portion 24C in FIG. 3, and the lower portion of the steering wheel 12 can be surely covered.

6 and 7 show a bag body 24 according to the third embodiment of the present invention. The broken line 44 shown in FIG.
It is an imaginary line showing a bag body of an airbag device that is inflated into a flat sphere shape and has an inflation length A when viewed from the front centering on the center 42A of the opening 42. In the third embodiment, the inflation length of the lower portion is shown. The bag body 2 in which is increased by β compared to the expanded length of the upper part
No. 4 base fabric 124A on the side where the opening 42 is formed
A tack 24E is provided around the broken line 44 to sew a part of the base fabric 124A in a pinched state. This tack 24
E is formed at a total of 6 places on one side from the central portion of the base fabric 124A toward the outer periphery, and the amount of knobs of the base fabric 124A is larger on the outer peripheral side than on the central portion.

Therefore, when the bag body 24 is inflated, as shown in FIG. 7, the lower portion 24 below the tack 24E.
F bends toward the side opposite to the occupant and expands, covering the lower portion of the steering wheel 12. Therefore, even if the bag body 24 is pressed by the inertial movement of the occupant 46,
It is possible to reliably intervene between the occupant 46 and the steering wheel 12 without escaping in the upper direction, and to avoid direct contact between them.

Although FIG. 6 shows the bag body 24 in which tacks are formed at six places, the number of tacks is not limited to this as long as a predetermined part of the bag body 24 can be curved and inflated. It is not something that will be done.

Further, the third embodiment is applied to a bag body provided with an opening eccentric in a base cloth having a substantially circular shape when viewed from the front, like the bag body according to the second embodiment of the present invention. You may.

In the first to third embodiments described above, the pad that rotates in accordance with the steering direction of the steering wheel is shown. However, the bag body of the airbag device according to the present invention is
It may be used with a stationary pad of a type in which a pad including an airbag device does not rotate and remains stationary regardless of the steering direction of the steering wheel. When the stationary pad is used, the above effect is enhanced.

[0035]

Since the present invention has the above-mentioned structure, it is possible to obtain an excellent effect that it is excellent in absorbing the inertial force of the occupant in the lower portion of the steering wheel.

[Brief description of drawings]

FIG. 1 is a front view of a bag body of an airbag device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a state where the bag body of the airbag apparatus according to the first embodiment of the present invention is completely inflated during sudden vehicle deceleration.

FIG. 3 is a schematic side view showing a state in which a vehicle including a bag body of the airbag device according to the present invention is in a vehicle rapid deceleration state.

FIG. 4 is a front view of a bag body of an airbag device according to a second embodiment of the present invention.

FIG. 5 is a side sectional view showing a state where the bag body of the airbag apparatus according to the second embodiment of the present invention is inflated completely when the vehicle is rapidly decelerated.

FIG. 6 is a front view of a bag body of an airbag device according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of the airbag body according to the third embodiment of the present invention, in which the bag body is completely inflated during rapid vehicle deceleration, taken along the line I-I in FIG. Is.

FIG. 8 is a cross-sectional view of the entire configuration of an airbag device to which the bag body of the airbag device according to the present invention is applied, as viewed from the side.

FIG. 9 is a front view of a bag body of an airbag device according to a conventional example.

FIG. 10 is a cross-sectional view of a side view of a state where the bag body of the airbag device according to the conventional example is completely inflated when the vehicle is rapidly decelerated.

FIG. 11 is a schematic side view showing a state in which a vehicle including a bag body of an airbag device according to a conventional example is in a vehicle rapid deceleration state.

[Explanation of symbols]

10 Airbag device 12 Steering wheel 22 Inflator 24 Bag body 24A Lower part (wrap-around part) 24C Wrap-up expansion part 24D Portion on the side opposite to the eccentric direction of the opening (wrap-around part) 24F Lower part (extended expansion part) 42 Opening

Claims (3)

[Claims] 1. A bag body of an airbag device, which is attached to a steering wheel, inflates and deploys by gas, and is interposed between a steering wheel and an occupant to protect an occupant, in a radial direction from a part of an outer periphery of the bag body. A bag body of an airbag device, comprising a protruding portion that partially protrudes toward the outside of the steering wheel during deployment. 2. An opening for fixing to an inflator attached to a steering wheel is formed, the inflator is folded and stored in a state of being fixed to the opening, and gas generated from the inflator passes through the opening. In a bag body of an airbag device that inflates and expands by flowing into the inside and intervenes between the steering wheel and the occupant to protect the occupant, from one end of the bag body in the deployed state to the other end through the central portion. A bag body of an airbag device, wherein the opening is provided eccentrically toward the one end with respect to a central portion thereof, and the other end is a wrap-around portion that projects to the outside of the steering wheel when the bag body is deployed. 3. An opening for fixing an inflator mounted at a predetermined angle with respect to a horizontal direction of a vehicle body and attached to a steering wheel is formed, and the inflator is folded and stored while being fixed to the opening, In a bag body of an airbag device that protects an occupant by interposing between a steering wheel and an occupant, the gas generated from the inflator inflates and deploys when the bag body is inflated. A bag body of an airbag device, wherein an occupant contact portion that is in contact with a vertical line with respect to the vehicle body horizontal direction is below a horizontal line drawn from the lower portion of the steering wheel in parallel with the vehicle body horizontal direction.