JPH07228214A - Installing part structure for air bag device - Google Patents

Abstract

PURPOSE:To stabilize an output characteristics of blowout gas by maintaining an inflator at the normal temperature in the same with an interior temperature. CONSTITUTION:A case 5 of an air bag unit 4 is inserted in an opening part 12 of a duct 11 as an air introducing part 10, and an installing part of an inflator 6 in a case bottom part is protrusively arranged in the duct 11, and air-conditioning air flowing in the duct 11 is blown against the installing part of the inflator 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a mounting portion of an air bag device which is disposed at an appropriate portion in a passenger compartment such as a passenger seat side of a vehicle instrument panel or a passenger compartment side.

[0002]

2. Description of the Related Art As a mounting structure for an air bag device for a vehicle, for example, Japanese Patent Laid-Open Publication Nos.
Although various structures are known as shown in Japanese Patent No. 50893, the airbag device is folded and housed so as to surround the inflator, a case or a base plate to which the inflator is attached, and the inflator. A bag and a resin cover that encloses the inflator and the bag are configured as a unit, and this air bag unit is attached to the inside of the instrument panel, the inside of the vehicle compartment side such as the side door or the rear side, and the like. I am trying.

[0003]

As described above, the air bag unit is appropriately arranged at an appropriate portion in the vehicle compartment so that the occupant can be reliably restrained and protected by the bag which is inflated and deployed at the time of collision of the vehicle. However, since the inflator has the characteristic that the output of the ejected gas becomes high when the temperature is high and the output of the ejected gas becomes low when the temperature is low, the airbag unit is properly arranged in this way. However, the gas output characteristics may become unstable depending on the temperature environment of the location where the inflator is arranged.

Therefore, the present invention provides an air bag device mounting structure capable of stabilizing the gas output characteristics of the inflator.

[0005]

According to a first aspect of the present invention, air introduction for blowing air conditioning air to the inflator is introduced into at least an inflator installation portion of an airbag unit arranged in an appropriate portion in a vehicle compartment. Section is provided.

According to a second aspect of the present invention, the air introducing portion is formed by a duct, and the air bag unit is attached to the duct with its inflator facing the inside of the duct.

According to the third aspect of the present invention, the airbag unit includes a metal cylindrical case, a circular cylindrical inflator assembled to the bottom of the case, and an upper part of the inflator which is fixed to the case. A bag that is folded and stored in the case and a resin cover that is externally fitted and attached to the upper end of the case, while the duct has an opening for arranging the airbag unit, and the opening is provided in the opening. The case is inserted and the inflator mounting portion is arranged so as to project into the duct.

According to a fourth aspect of the present invention, a flange projecting outward is formed on the peripheral edge of the opening of the duct, and protrusions and notches are alternately formed adjacent to each other on the flange while the cover is provided. A notch and a protrusion that are aligned with and engage with the protrusion and the notch of the flange are alternately formed adjacent to each other on the edge of the end, and the notch and the protrusion of the cover are formed on the protrusion and the notch of the flange. The retainer plate for fastening is fixed to the flange and the projection of the cover by bolts and nuts so as to connect and fix the cover and the flange.

According to a fifth aspect of the present invention, the airbag unit includes a base plate having a disk-shaped inflator penetratingly arranged therein, and a bag which surrounds the inflator and is fixedly attached to the base plate and folded above the inflator. The duct includes an opening for arranging the airbag unit, and the base plate is inserted into the opening to expose the bottom of the inflator inside the duct. It is set up.

According to a sixth aspect of the present invention, a flange protruding outward is formed on the peripheral edge of the opening of the duct according to the fifth aspect, and the projection and the notch are alternately formed adjacent to the flange. On the other hand, on the periphery of the end portion of the cover, notches and protrusions that align with and engage with the protrusions and notches of the flange are formed alternately and adjacently, and the protrusions and notches of the flange are formed. The notch of the cover and the projection are engaged with each other, and the retainer plate for fastening is fixed by bolts and nuts over the projection of the flange and the projection of the cover, thereby connecting and fixing the cover and the flange.

[0011]

According to the first aspect of the present invention, since the inflator of the airbag unit is blown with the air for air conditioning introduced into the air introduction portion, it is always maintained at the same room temperature as the passenger compartment temperature, and the gas output of the inflator is kept. The characteristics are stabilized.

According to the second aspect, since the air introducing portion is formed by the duct and the air bag unit is attached to the duct, the air bag unit and the duct can be sub-assembled, and the air bag unit and the duct are attached to the vehicle body. It is not necessary to separately assemble the side members, and the assembly to the vehicle body can be easily performed, and the airbag unit and the duct can be integrated to form a compact structure.

According to the third aspect, even in an airbag unit of a type in which a circular tubular inflator is assembled to the bottom of the case, the inflator mounting portion of the case is arranged so as to project into the duct. Can be kept at room temperature by exposing it to air for air conditioning.

According to the present invention, when the airbag unit is attached to the duct, the protrusion and the notch formed on the flange at the peripheral edge of the opening of the duct and the notch formed at the peripheral edge of the end of the cover of the airbag unit. By engaging the protrusions with the protrusions, the positioning can be performed, and the airbag unit can be easily attached without displacement.

According to the fifth aspect, even in the case of the air bag unit of the type in which the disk type inflator is penetrated through the base plate, the inflator is inserted into the duct together with the base plate, and the bottom of the inflator is placed in the duct. Since the inflator is exposed, the inflator can be exposed to air-conditioning air and kept at room temperature.

According to the sixth aspect, even when the airbag unit having such a disc type inflator is used, when the airbag unit is attached to the duct, the protrusion and the notch formed on the flange at the peripheral edge of the opening of the duct. In addition, the positioning can be performed by engaging the notch formed on the peripheral edge of the end of the cover of the airbag unit with the protrusion, and the airbag unit can be easily attached without displacement.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIGS. 1 to 3 show a structure of a mounting portion of an airbag device for a passenger in a passenger seat, which is disposed on an instrument panel. Reference numeral 1 is a front window panel, 2 is an instrument panel, and a passenger seat side thereof. An opening 3 that is closed by a lid portion described later is formed on the upper surface of the.

An air bag unit 4 is provided inside the instrument panel 2 so as to face the opening 3. In this embodiment, a metal case 5 and a bottom of the case 5 penetrate in the vehicle width direction. A circular tubular inflator 6 attached,
Covering the upper part of the inflator 6 and fixed to the case 5,
A bag 7 that is folded and stored in the case 5, and a case 5
And a resin-made cover 8 which is externally fitted and attached to the upper end of the.

The cover 8 is formed as a lid portion 8a having a size and shape such that the upper surface portion thereof can be closely aligned with the opening portion 3, and the lid portion 8a closes the opening portion 3.

Further, a fragile portion 9 is formed in the central portion of the lid portion 8a, and the lid portion 8a is formed by the initial inflation pressure of the bag 7.
The central portion of the bag is torn off from the fragile portion 9 and quickly torn, so that the back 7 can be appropriately inflated and deployed toward the passenger seat occupant.

An air introduction portion 10 for blowing a part of the air-conditioning air supplied into the vehicle compartment is provided at a portion of the airbag unit 4 where the inflator 6 is arranged.

In this embodiment, the air introducing portion 10 is connected to the duct 11
The airbag unit 4 and the inflator 6 thereof.
Is attached to the duct 11 so as to face the inside of the duct 11.

As the duct 11, a vent duct connected to a vent outlet (not shown) provided on the instrument panel 2 can be effectively used as it is. However, depending on the case, a bypass duct is provided in the vent duct and an air is supplied to the bypass duct. The bag unit 4 may be attached.

An opening 12 having a diameter into which the case 5 can be inserted is formed on the upper wall of the duct 11 for mounting the airbag unit 4, and the case 5 is inserted through the opening 12 to insert the inflator 6 into the inflator 6. The mounting portion is arranged so as to project into the duct 11.

Further, in the present embodiment, a flange 13 protruding outward is formed on the peripheral edge of the opening 12 of the duct 11, and the protrusion 13 and the notch 15 are alternately arranged adjacent to the flange 13. On the other hand, the protrusion 14 of the flange 13 is formed on the peripheral edge of the end of the cover 8 of the airbag unit 4 while being formed.
And the notch 16 and the protrusion 1 which are aligned with and engage with the notch 15.
7 are formed alternately adjacent to each other.
By engaging with the air bag unit 5, the air bag unit 4 is prevented from shifting when the air bag unit 4 is attached to the duct 11.

The airbag unit 4 is fixed by fixing the protrusion 14 of the flange 13 and the cover 8 which are in the above-mentioned engagement relationship.
Retainer plate 18 for fastening over the projection 17 of the
Is fixed by bolts and nuts 19, and the cover 8 and the flange 13 are connected and fixed.

In this embodiment, the projecting portion 17 of the cover 8 and the case 5 are fixed together by bolts and nuts 19 for fixing the retainer plate 18.

According to the structure of the above embodiment, the metal case 5 to which the inflator 6 of the airbag unit 4 is attached.
Since the bottom part of the inflator is disposed so as to project into the duct 11, the inflator mounting portion of the case 5 is exposed to the air-conditioning air flowing in the duct 11 so that the inflator 6 is always kept at the same room temperature as the cabin temperature. Therefore, the output characteristics of the ejected gas when the inflator 6 is operating can be stabilized.

As a result, the bag 7 can be inflated and expanded as designed to properly restrain the passenger in the passenger seat.
It is possible to stabilize the restraint performance of the passenger seat occupant by the bag 7 and further improve safety.

Further, in this embodiment, since the air introducing portion 10 is formed as the duct 11 and the air bag unit 4 is attached to the duct 11 as described above, the air bag unit 4 and the duct 11 can be sub-assembled. Therefore, it is not necessary to separately assemble the airbag unit 4 and the duct 11 inside the instrument panel 2, and the inside of the instrument panel 2 can be easily assembled, and the airbag unit 4 and the duct 11 Can be made compact by integrating them, and the flexibility of the arrangement layout inside the instrument panel 2 can be expanded.

In particular, in this embodiment, when the above-mentioned air bag unit 4 and the duct 11 are sub-assembled, the case 5 of the air bag unit 4 is connected to the opening 12 of the duct 11.
The cover 8 of the airbag unit 4 into the protrusion 14 and the notch 15 of the flange 13 at the periphery of the opening 12.
The airbag unit 4 can be positioned by engaging the notch 16 and the protrusion 17 at the lower end peripheral edge of the airbag unit 4. Therefore, the displacement movement of the airbag unit 4 is eliminated, and the retainer plate 18 and the bolts / nuts 19 are used. The fixing work of the airbag unit 4 can be easily performed.

The embodiment shown in FIGS. 4 to 6 shows an example using an airbag unit 20 having a disc type inflator.

The disc type inflator 21 penetrates through a metal base plate 22 to
It is fastened and fixed to.

The bag 23 surrounds the upper surface side of the inflator 21, is fixedly attached to the base plate 22, and is folded and arranged above the inflator 21.

24 is an inflator 21 and a bag 23
A resin cover that encloses the
The fragile portion 25 is formed so as to be easily split by the initial inflation pressure of No. 3, and the cover 24 overlaps the mounting flange 26 formed on the inner circumference of the end portion with the peripheral portion of the bag 23 on the surface of the base plate 22, It is fastened and fixed to the base plate 22 together with the bag 23.

The airbag unit 20 is
The base plate 22 is inserted into the opening 12 of the duct 11, the bottom of the inflator 21 is exposed in the duct 11, and is attached to the duct 11.

Even in the case of this embodiment, the duct 11
The protrusions 14 and the notches 15 are alternately formed adjacent to each other on the flange 13 at the peripheral edge of the opening 12, while the protrusions 14 and the notches 15 of the flange 13 are formed at the peripheral edge of the cover 24. The notches 27 and the protrusions 28 which are aligned and engaged with each other are alternately formed adjacent to each other, and the notches 27 and the protrusions 28 are respectively formed to correspond to the protrusions 14 and the notches 1 of the flange 13.
5, the retainer plate 18 for fastening is fixed with bolts and nuts 19 over the protrusions 14 and 28, and the cover 24 and the flange 13 are connected to each other, so that the airbag unit 20 is ducted. It is attached to 11.

Further, in this embodiment, the retainer plate 18
The projection 28 of the cover 24 and the peripheral flange 29 of the base plate 22 are fastened together by a bolt and nut 19 for fixing the same.

Therefore, also in this embodiment, since the bottom of the inflator 21 is exposed in the duct 11, the air conditioning air flowing in the duct 11 can be blown directly to the bottom of the inflator 21. Therefore, the inflator 21 can always be maintained at the same room temperature as the passenger compartment temperature, and the output characteristics of the ejected gas can be stabilized.

In particular, in this embodiment, the airbag unit 2
No. 0 is provided with a disk-type inflator 21 penetratingly arranged in the base plate 22, the amount of protrusion of the bottom of the inflator 21 into the duct 11 is small, and a large ventilation area of the duct 11 can be secured to reduce ventilation resistance. From
When a vent duct is used as the duct 11, there is an advantage that the amount of air conditioning air blown out from the vent outlet need not be reduced.

Further, in the case of this embodiment, as in the case of the above embodiment, the air bag unit 20 can be attached to the duct 11 to make it compact, and the air bag unit 2
When mounting 0, the airbag unit 20 is positioned by engaging the protrusion 14 and the notch 15 of the flange 13 at the peripheral edge of the opening of the duct 11 with the notch 27 and the protrusion 28 at the peripheral edge of the cover 24. This has the advantage that it can be done and the mounting workability can be improved.

In the above-mentioned embodiment, the structure of the mounting portion of the airbag device for the passenger seat disposed on the instrument panel 2 is disclosed. The same can be applied to the provided airbag device.

[0044]

As described above, according to the present invention, the following effects can be obtained.

(1) Since the air introducing portion for blowing the air conditioning air to the inflator is provided in the inflator disposing portion of the airbag unit, the inflator is blown with the air conditioning air at a room temperature equal to the cabin temperature. Therefore, the output characteristics of the jetted gas can be stabilized, and the safety can be further improved.

(2) By forming the air introducing portion with a duct and attaching the airbag unit to the duct with the inflator facing the inside of the duct, the airbag unit and the duct can be sub-assembled to the vehicle body side. The assembly to the member can be easily performed, and the airbag unit and the duct can be integrated to form a compact structure, and the degree of freedom in the layout of the member on the vehicle body side can be increased.

(3) Even when an air bag unit in which a circular tubular inflator is attached to the bottom of a metallic tubular case is used, the case is inserted into the opening formed in the duct to attach the inflator. By placing the inflator in the duct, the air-conditioning air flowing through the duct is positively blown to the inflator-attached portion to keep the inflator at room temperature, which is the same as the passenger compartment temperature, and the output characteristics of the ejected gas are stabilized Can be converted.

(4) When the air bag unit having the circular tubular inflator is used to assemble the air bag unit to the duct, the protrusion and the notch are adjacent to the flange formed at the periphery of the opening of the duct. On the other hand, on the other hand, on the periphery of the end portion of the cover of the airbag unit, the protrusions and the notches that are aligned with and engaged with the notches are alternately formed adjacent to each other, and the covers are formed. Position the airbag unit by engaging the notches and protrusions on the side with the corresponding protrusions and notches on the flange side, and connecting and fixing the retainer plate across the protrusions on the cover side and the flange side. The fixing work can be performed with ease, and the attachment work of the airbag unit can be easily performed.

(5) When using an airbag unit having a disk-type inflator arranged so as to pass through a metal base plate, the inflator is inserted into the duct together with the base plate, and the bottom of the inflator is exposed in the duct. As a result, the air for air conditioning flowing in the duct can be directly blown to the bottom of the inflator, so that the inflator can be maintained at the same room temperature as the passenger compartment temperature and the output maintenance of the inflator's ejected gas is stabilized. You can

(6) When the air bag unit having the disc type inflator is attached to the duct as described above, the amount of protrusion of the bottom of the inflator into the duct is small,
Since the ventilation area of the duct can be secured to be large and the ventilation resistance can be reduced, the bend duct of the air conditioner can be effectively used as the duct without reducing the blowing amount of the air conditioning air.

(7) Even when the air bag unit having this disk type inflator is used to attach the air bag unit to the duct, the flange and the notch are formed adjacent to the flange formed at the periphery of the opening of the duct. On the other hand, on the other hand, the notch and the protrusion which are aligned with and engaged with the protrusion and the notch are alternately formed adjacent to each other on the peripheral edge of the end of the cover of the airbag unit. Engage the corresponding protrusions and notches on the flange side,
By connecting and fixing the retainer plates over the protrusions on the cover side and the flange side, the airbag unit can be positioned and fixed, and the airbag unit can be easily attached.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing an attached state of the airbag unit of the embodiment.

FIG. 3 is a view on arrow A in FIG.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a perspective view showing an airbag unit attached state of the embodiment.

FIG. 6 is a view on arrow B in FIG.

[Explanation of symbols]

 4,20 Airbag unit 6,21 Inflator 10 Air introduction part 11 Duct

Claims (6)

[Claims] 1. An air bag device, comprising: an air introducing section for blowing air-conditioning air to the inflator, at least at an inflator installation area of an air bag unit installed at an appropriate area in a vehicle compartment. Mounting structure. 2. The mounting structure for an airbag apparatus according to claim 1, wherein the air introducing portion is formed by a duct, and the airbag unit is mounted on the duct with the inflator facing the inside of the duct. 3. An air bag unit, a metal tubular case, a circular tubular inflator assembled to the bottom of the case, and an upper part of the inflator that is fastened to the case and is folded into the case. The bag has a stored bag and a resin cover fitted over the upper end of the case, and the duct has an opening for arranging the airbag unit, and the case is inserted into the opening. 3. The mounting structure for an airbag device according to claim 2, wherein the inflator mounting portion is arranged so as to project into the duct. 4. The duct is provided with a flange projecting outward at a peripheral edge of an opening thereof, and a protrusion and a notch are formed alternately adjacent to each other on the flange, while a peripheral edge of the cover is provided with:
Notches and protrusions that are aligned with and engage with the protrusions and notches of the flange are alternately formed adjacent to each other, and the notches and protrusions of the cover are engaged with the protrusions and notches of the flange. 4. The airbag device according to claim 3, wherein the retainer plate for fastening is fixed by bolts and nuts over the protrusion of the flange and the protrusion of the cover, and the cover and the flange are connected and fixed. Mounting structure. 5. An air bag unit including a base plate having a disk-shaped inflator penetratingly arranged therein, a bag surrounding the inflator and fixed to the base plate, and a bag folded above the inflator, and the bag and the inflator included. A duct is provided with an opening for arranging an airbag unit, and the base plate is inserted into the opening so that the bottom of the inflator is exposed inside the duct. Claim 2
Attachment structure of the airbag device described. 6. The duct is provided with a flange projecting outward at a peripheral edge of an opening thereof, and a protrusion and a notch are alternately formed adjacent to each other on the flange, while a peripheral edge of the cover is provided with:
Notches and protrusions that are aligned with and engage with the protrusions and notches of the flange are alternately formed adjacent to each other, and the notches and protrusions of the cover are engaged with the protrusions and notches of the flange. 6. The airbag device according to claim 5, wherein the retainer plate for fastening is fixed by bolts and nuts over the protrusion of the flange and the protrusion of the cover, and the cover and the flange are connected and fixed. Mounting structure.