JP2006273151A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device capable of suitably inflating an airbag when receiving an impact from the rear side of a vehicle. <P>SOLUTION: The airbag device 15 is mounted to a vehicle in which an aftermost part in a cabin forms a luggage compartment. The airbag device 15 has an airbag 17 to be inflated in a backrest 12b of a seat 12 of an aftermost row by gas from an inflator 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an airbag device that protects an occupant by inflating an airbag at the rear part of a passenger compartment when receiving an impact from the rear of the vehicle.

Conventionally, this type of airbag device is mounted on a vehicle in which the rearmost part of the passenger compartment is a cargo compartment (trunk room), and the airbag is accommodated in a folded state on the floor of the cargo compartment. Is known (see, for example, Patent Document 1). In this airbag apparatus, the airbag is deployed and inflated in the cargo compartment by supplying gas.
Japanese Utility Model Publication No. 64-7054

  By the way, since the airbag apparatus of patent document 1 expands and inflates upward from the floor surface of the cargo compartment, when the luggage is accommodated in the cargo compartment, the airbag can be suitably deployed and inflated. There was a risk of difficulty. Furthermore, the airbag device of Patent Document 1 is wasteful because the airbag is inflated and spreads over the entire cargo compartment.

  The present invention has been made paying attention to such problems. The object is to provide an airbag device capable of suitably inflating an airbag when subjected to an impact from the rear of the vehicle.

  In order to achieve the above object, the invention according to claim 1 is an airbag device mounted on a vehicle in which the rearmost part of the passenger compartment is a cargo compartment, and is inflated by supplying gas from a gas generation source. And the airbag is provided so as to inflate at least one of the inside and the back of the backrest portion of the seat disposed at the rearmost part of the vehicle interior. .

  According to the above configuration, when the vehicle receives an impact from the rear, the airbag is suitably inflated behind the passenger seated on the seat disposed at the rearmost part in the passenger compartment. It becomes possible to protect.

The gist of the invention according to claim 2 is that, in the invention according to claim 1, the airbag is accommodated in the deployed state inside the backrest portion.
According to the above configuration, since the airbag is inflated at a position close to the occupant, the protection performance of the airbag with respect to the occupant is suitably exhibited. Further, since the airbag is accommodated in the deployed state in the backrest portion in the deployed state, the airbag is inflated in a short time. For this reason, it becomes possible to protect a passenger suitably.

The gist of the invention of claim 3 is that, in the invention of claim 2, the airbag is accommodated in a deployed state inside the seat frame of the seat.
According to the said structure, an airbag can be made small and the waste at the time of the expansion | swelling can also be reduced now.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the airbag includes a main inflatable portion that is inflated inside the backrest portion, and a sub-inflatable portion that is deployed and inflated on the back surface of the backrest portion. The main point is that

According to the said structure, the said passenger is protected more suitably by the synergistic action of a main expansion part and a sub expansion part.
The invention according to claim 5 is the invention according to claim 4, wherein the main inflating part is accommodated in the deployed state inside the backrest part, and the sub-inflating part is folded inside the backrest part. The main point is that it is housed in a closed state.

  According to the above configuration, since both the main inflatable portion and the sub inflatable portion are accommodated in the backrest portion, the airbag can be smoothly deployed and inflated regardless of the presence or absence of luggage in the luggage compartment. .

  The invention according to claim 6 is the invention according to claim 4 or 5, wherein the backrest portion is a plate member that becomes a floor surface of the luggage compartment when the backrest portion is tilted forward. And when the sub-expansion portion expands and expands on the back surface, the expansion and expansion of the sub-expansion portion corresponds to a location where the sub-expansion portion is accommodated in at least the backrest portion of the plate member. The gist is that the portion is configured to be detached from the backrest portion.

  According to the above configuration, when the sub-expansion portion is expanded and expanded, the sub-expansion portion is smoothly expanded and expanded without being obstructed by the plate member.

  According to the present invention, it is possible to provide an airbag device capable of suitably inflating an airbag when receiving an impact from the rear of the vehicle.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the description of each embodiment, the traveling direction (forward direction) of the vehicle will be described as the front (front of the vehicle). Unless otherwise specified, the vertical direction and the horizontal direction in the following description are the same as the vertical direction and the horizontal direction in the vehicle traveling direction.

  As shown in FIG. 1, a plurality of rows (three rows in this embodiment) of seats arranged in the front-rear direction are arranged in the passenger compartment of the vehicle 11. A space on the rear side of the last row sheet 12 arranged in the last row (third row from the front) of each sheet serves as a luggage compartment 13 for loading a load. In other words, the rearmost part of the passenger compartment of the vehicle 11 is the luggage compartment 13. The rear wall of the vehicle 11 is a rear door 11a that can be freely opened and closed. By opening the rear door 11a, a load can be taken in and out of the luggage compartment 13 from the outside.

  As shown in FIGS. 1 and 4, the last row seat 12 is a so-called bench seat in which two seats are integrally formed, and includes a seat portion 12a, a backrest portion 12b, and a pair of headrests 12c. A U-shaped seat frame 18 is embedded in the backrest portion 12b along the periphery of the backrest portion 12b (see FIG. 4). A plate member 14 having a substantially rectangular shape is provided on the back surface 12d of the backrest portion 12b so as to cover the entire back surface 12d. The surface of the plate member 14 is covered with a cover made of cloth or the like (not shown). The plate member 14 constitutes the floor surface of the luggage compartment 13 when the backrest portion 12b of the last row seat 12 is tilted forward and the backrest portion 12b is placed on the seat portion 12a. In this state, the luggage compartment 13 can be used widely (see FIG. 1).

  As shown in FIGS. 2 and 4, an airbag device 15 is housed in the backrest portion 12 b. The airbag device 15 includes a pair of left and right inflators 16 that form a columnar shape as a gas generation source, and a bag-shaped airbag 17 that covers the inflator 16. The airbag 17 is accommodated in the backrest portion 12b in a deployed state (a state where the airbag 17 is expanded without gas). In this state, the airbag 17 has a substantially rectangular shape in plan view, and occupies most of the backrest portion 12b in plan view in the left-right direction and the up-down direction. In this case, the airbag 17 is accommodated in a deployed state inside the seat frame 18 in the left-right direction.

  The two inflators 16 are arranged at the lower end portion in the airbag 17 so as to be aligned with each other at a predetermined interval. A gas generating agent for inflating the airbag 17 is accommodated inside the inflator 16, and a gas outlet (not shown) for ejecting gas generated from the gas generating agent is provided on the surface of the inflator 16. It has been. Further, the inflator 16 is electrically connected to an impact sensor (not shown) for detecting an impact on the rear portion of the vehicle.

  That is, when an impact of a predetermined value or more is applied to the rear portion of the vehicle 11, gas is generated from the gas generating agent in the inflator 16 based on the detection signal from the sensor, and this gas enters the airbag 17 from the gas outlet. The airbag 17 is inflated to be inflated. In this case, when the impact applied to the rear portion of the vehicle 11 does not reach a predetermined value, the passenger P is sufficiently protected by the last row seat 12, so the airbag device 15 is not activated and the airbag 17 is inflated. Not to be.

  The last row seat 12 is provided with a seating sensor (not shown) that detects whether or not the passenger P is seated on the last row seat 12, and the passenger P is seated on the last row seat 12. If not, the airbag 17 is not inflated even when an impact of a predetermined value or more is applied to the rear portion of the vehicle 11. Further, the last row seat 12 is provided with a seat sensor (not shown) that detects whether or not the backrest portion 12b is tilted forward, and the backrest portion 12b is tilted forward. In some cases, the airbag 17 is not inflated even when an impact of a predetermined value or more is applied to the rear portion of the vehicle 11.

  As shown in FIG. 3, the airbag 17 is formed by sewing a pair of front and rear base fabrics 17a and 17b made of woven fabric or the like at the periphery thereof. Inside the airbag 17, two pairs of tethers 19 are formed so as to be lined up on the left and right sides for regulating the thickness in the front-rear direction when the airbag 17 is inflated (see FIG. 4). That is, each tether 19 is constructed between the inner surfaces of both base fabrics 17a and 17b.

Next, the operation | movement about the airbag apparatus 15 comprised as mentioned above is demonstrated based on FIGS.
Now, when an impact of a predetermined value or more is applied to the rear part of the vehicle 11 due to a collision (so-called rear collision) of a collision object (for example, another vehicle) on the rear part of the vehicle 11, the gas outlets of both inflators 16 The gas is jetted and supplied into the airbag 17 from above, and the airbag 17 is inflated. At this time, the airbag 17 is regulated to a predetermined thickness by each tether 19. Then, due to the inflation of the airbag 17, the occupant P is shifted from the seating position (position shown in FIG. 2) to a position ahead of the seating position (position shown in FIG. 3). For this reason, when the collision object enters the cargo compartment 13 due to the collision, the passenger P is moved away from the collision object by an amount corresponding to the position of the passenger P being shifted. In combination with the cushioning property, the impact received by the passenger P is reduced.

According to the first embodiment described in detail above, the following effects are exhibited.
(1) When the vehicle 11 receives an impact from the rear, the airbag is suitably inflated behind the passenger P seated on the last row seat 12, and thus the passenger P can be suitably protected. it can.

  (2) Since the airbag 17 is inflated in a position close to the occupant P, that is, in the backrest portion 12b, the protection performance for the occupant P of the airbag 17 can be suitably exhibited.

(3) Since the airbag 17 is housed in the backrest portion 12b, the airbag 17 can be reliably and smoothly inflated regardless of the presence or absence of luggage in the luggage compartment 13.
(4) Since the airbag 17 is narrower than the seat frame 18 of the last row seat 12, the airbag 17 can be made smaller and waste during expansion can be reduced.

(5) Since the airbag 17 is accommodated in the backrest portion 12b in the deployed state, the airbag 17 can be inflated in a short time.
(6) The thickness of the airbag 17 in the front-rear direction during inflation can be regulated to a predetermined thickness by the tethers 19. For this reason, the airbag 17 can be made to act suitably with respect to the passenger P, and this passenger P can be protected effectively.

(Second Embodiment)
Next, a second embodiment of the present invention will be described focusing on the differences from the first embodiment.

  As shown in FIGS. 5 and 6, in the airbag device 15 of the second embodiment, the airbag 17 is changed to the airbag 30, and the two inflators 16 are arranged at a predetermined interval at the upper end portion in the airbag 30. And are arranged so that they are arranged side by side. The airbag 30 is accommodated in the backrest portion 12b, and a main inflatable portion 31 that inflates inside the backrest portion 12b, a sub-inflatable portion 32 that inflates and inflates on the back surface 12d of the backrest portion 12b, and the backrest portion 12b. And an auxiliary expansion part 33 that expands and expands between the passenger and the neck of the passenger P.

  On the rear surface of the upper end portion of the main expansion portion 31, a first communication hole 31 a that communicates the main expansion portion 31 and the sub expansion portion 32 is formed, and on the front surface of the upper end portion of the main expansion portion 31, A second communication hole 31b for communicating the main expansion portion 31 and the auxiliary expansion portion 33 is formed (see FIGS. 6 and 8). That is, the main expansion part 31, the sub expansion part 32, and the auxiliary expansion part 33 communicate with each other through the first and second communication holes 31a and 31b.

  The main inflating portion 31 is accommodated in the backrest portion 12b in a deployed state (a state in which the main inflating portion 31 is expanded without gas) as in the case of the airbag 17. In this state, the main expansion portion 31 has a substantially rectangular shape in plan view, and occupies most of the backrest portion 12b in plan view in the left-right direction and the vertical direction. Further, as in the case of the airbag 17, the main inflating portion 31 is accommodated in a deployed state inside the seat frame 18 in the left-right direction.

  On the other hand, the auxiliary expansion part 32 and the auxiliary expansion part 33 are accommodated in a folded state at the upper end part in the backrest part 12b (see FIG. 5). As shown in FIGS. 6 and 8, the sub-expansion portion 32 expands and expands at the upper end portion 14a of the plate member 14 (that is, the portion corresponding to the accommodation position of the sub-expansion portion 32 in the backrest portion 12b). Due to the impact, the backrest 12b is detached (broken) from the back surface 12d. The sub-expansion portion 32 is expanded and inflated upward from the upper end portion of the back surface 12d of the backrest portion 12b so as to substantially extend along the extended surface of the back surface 12d. As shown in FIG. 7, the sub-expansion portion 32 in the expanded and inflated state has a substantially rectangular shape when viewed from the rear, and through holes 32a (non-expanded and expanded portions) are formed in portions corresponding to both headrests 12c. It has come to be. That is, the sub-expansion part 32 in the deployed and expanded state surrounds both the headrests 12c as viewed from the rear.

Next, the operation | movement about the airbag apparatus 15 comprised as mentioned above is demonstrated based on FIGS.
Now, when an impact of a predetermined value or more is applied to the rear part of the vehicle 11 due to a collision (so-called rear collision) of a collision object (for example, another vehicle) on the rear part of the vehicle 11, the gas outlets of both inflators 16 The gas is ejected from the air into the airbag 30 and the airbag 30 is inflated. That is, the main inflatable portion 31 is inflated in the backrest portion 12b, the secondary inflatable portion 32 is inflated and inflated on the back surface 12d of the backrest portion 12b, and the auxiliary inflatable portion 33 is in contact with the backrest portion 12b and the neck of the passenger P. Inflated between. At this time, the main expansion portion 31 is regulated to a predetermined thickness by each tether 19, and the upper end portion 14a of the plate member 14 is placed on the back surface 12d of the backrest portion 12b due to an impact when the sub expansion portion 32 is expanded and expanded. Detach from.

  And by the expansion | swelling of the said main expansion part 31, the passenger P is shifted from the seating position (position shown in FIG. 5) to the position ahead (position shown in FIG. 6) rather than this seating position. For this reason, when the collision object enters the cargo compartment 13 due to the collision, the passenger P is moved away from the collision object by an amount corresponding to the position of the passenger P being shifted. Combined with the cushioning property of the portion 31, the impact received by the passenger P is reduced. Further, the neck and head of the passenger P are suitably protected from the collision object by the expansion and expansion of the auxiliary expansion portion 32 and the auxiliary expansion portion 33. Therefore, the passenger P is effectively protected from the collision object by the synergistic action of the main inflating portion 31, the sub inflating portion 32, and the auxiliary inflating portion 33.

  Further, when the collision object is a vehicle having a vehicle height higher than that of the vehicle 11, the position of entering the rear portion of the vehicle 11 is also increased. In such a case, the passenger P is particularly preferably protected because the sub-inflatable portion 32 is deployed and inflated at a high position in the passenger compartment.

According to the second embodiment described in detail above, the following effects are exhibited in addition to the effects (1) to (6) of the first embodiment.
(7) Since the synergistic action of the main inflating part 31 and the sub inflating part 32 can be obtained when the airbag 30 is deployed and inflated, the passenger can be suitably protected.

  (8) Since the upper end portion 14a of the plate member 14 is detached from the back surface 12d of the backrest portion 12b due to an impact at the time of expansion and expansion of the sub expansion portion 32, the expansion and expansion of the sub expansion portion 32 is a plate member. 14 can be performed smoothly without being obstructed.

(Example of change)
In addition, each said embodiment can also be changed and actualized as follows.
In the first embodiment, the airbag device 15 may be configured such that the airbag 17 is inflated between the plate member 14 and a cover that covers the surface of the plate member 14.

  -In the said 2nd Embodiment, you may comprise so that the board member 14 whole may detach | desorb from the back surface 12d of the backrest part 12b with the impact at the time of the expansion | deployment expansion | swelling of the sub expansion part 32. FIG. That is, the plate member 14 only needs to have a configuration in which at least a portion of the backrest portion 12b corresponding to the accommodation location of the sub-expansion portion 32 is detached from the backrest portion 12b.

In the second embodiment, at least one of the main inflating portion 31 and the sub inflating portion 32 of the airbag 30 may be omitted.
In the second embodiment, the auxiliary inflating portion 33 of the airbag 30 may be omitted.

  In the first and second embodiments, the last row sheet 12 may be a so-called split sheet in which two sheets are individually arranged in parallel.

The side view which shows the vehicle interior of the vehicle of 1st Embodiment. The side view which shows the last row sheet | seat of 1st Embodiment. The side view which shows the inflated state of the airbag of 1st Embodiment. The rear view which shows the inflated state of the airbag of 1st Embodiment. The side view which shows the last row sheet | seat of 2nd Embodiment. The side view which shows the expansion | deployment state of the airbag of 2nd Embodiment. The rear view which shows the expansion | deployment inflation state of the airbag of 2nd Embodiment. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Vehicle, 12 ... Last row seat as a seat, 12b ... Backrest part, 12d ... Back surface of a backrest part, 13 ... Cargo compartment, 14 ... Plate member, 15 ... Air bag apparatus, 16 ... Inflator as a gas generation source, 17, 30 ... Airbag, 18 ... Seat frame, 31 ... Main inflatable part, 32 ... Sub-inflatable part, P ... Passenger.

Claims (6)

In an airbag device mounted on a vehicle in which the rearmost part of the passenger compartment is a luggage compartment,
An airbag that is inflated by supplying gas from a gas generation source is provided in the seat, and the airbag is inflated at least one of the inside and the back of the backrest portion of the seat disposed at the rearmost portion in the passenger compartment. An air bag device provided in the air bag. The airbag device according to claim 1, wherein the airbag is accommodated in the deployed state inside the backrest portion. The airbag device according to claim 2, wherein the airbag is accommodated in a deployed state inside a seat frame of the seat. 2. The airbag device according to claim 1, wherein the airbag includes a main inflation portion that inflates inside the backrest portion, and a secondary inflation portion that deploys and inflates on a back surface of the backrest portion. . The said main expansion part is accommodated in the expansion | deployment state inside the said backrest part, and the said sub expansion part is accommodated in the state folded by the inside of the said backrest part, It is characterized by the above-mentioned. Airbag device. The backrest portion has a plate member that becomes the floor surface of the cargo compartment when the backrest portion is tilted forward, and when the sub-expansion portion expands and expands on the back surface, The at least a portion of the plate member corresponding to the accommodation position of the sub-expansion portion in the backrest portion is detached from the backrest portion by the expansion and expansion of the sub-expansion portion. The airbag device according to claim 4 or 5.

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