JP4433957B2 - Side airbag device - Google Patents

Description

  The present invention relates to a side airbag device in which an airbag is deployed and inflated on the side of a passenger.

In general, when a side airbag device is subjected to an impact of a predetermined value or more on the body side portion of a vehicle, the airbag is instantaneously deployed and inflated on the side of the passenger by the pressure of gas injected from the inflator. Various side airbag devices have been proposed in the past for protecting a person's head, chest, or waist. For example, the side airbag device described in Patent Document 1 protects the occupant's head and chest. The side airbag device deploys and expands on the side of the occupant's chest and on the side of the occupant's head. An airbag is integrally formed with a sub-deployment part that is deployed and inflated. The airbag is communicated between the main deployment part and the sub-deployment part through a gas circulation port that is restricted so as to restrict the flow of gas, and first the main deployment is performed by the pressure of the gas injected from the inflator. After the portion starts to expand and expand, the sub-deployment portion starts to expand and expand following the expansion and expansion of the main expansion portion.
JP-A-10-297409

  By the way, in the side airbag device described in Patent Document 1, in the state where the base end portion (rear end portion of the main deployment portion) of the airbag is fixed to the backrest portion of the seat, the front end portion (main portion of the airbag) The front end portion of the development portion and the front end portion of the sub-expansion portion located above the main development portion) are expanded and inflated so as to largely protrude toward the front of the vehicle. For this reason, the airbag receives a biasing force toward the front side of the vehicle due to the gas pressure concentrated on the front end of the airbag from the initial stage of the deployment and inflation. There has been a problem that it is easy to be deployed and inflated at a position shifted from the assumed deployed and expanded position to the front side of the vehicle.

  The present invention has been made paying attention to such problems. An object of the present invention is to provide a side airbag device capable of suitably controlling the deployed and inflated position of the airbag.

In order to achieve the above object, the invention according to claim 1 is characterized in that at least between a body side part of a vehicle and a passenger seated on a seat in a vehicle interior due to the pressure of gas injected from a gas generation source. In the side airbag device including an airbag that is deployed and inflated with a biasing force toward the front side of the vehicle, the airbag includes a main deploying portion that is deployed and inflated on the side of the chest of the occupant, and a head side of the occupant A sub-deployment portion that expands and expands in one direction, and the main deployment portion and the sub-deployment portion are integrally formed in a communicating state, and an inner surface of the sub-deployment portion is disposed in the main deployment portion. A pocket portion having an opening facing the gas generation source side is provided, the pocket portion is provided with a fragile portion that tears when the sub-deployment portion is expanded and inflated, and the airbag includes the airbag. Tether that regulates thickness during expansion and expansion And the fragile portion is formed between a rim-attached portion where the rims of a pair of base fabrics constituting the airbag are attached to each other and the tether, and an end portion of the tether is an end of the fragile portion. It is summarized that it is formed so as to overlap the part.

According to the above configuration, at the initial stage of deployment and inflation when the main deployment portion of the airbag is deployed and inflated, part of the gas injected from the gas generation source enters the pocket portion and is blocked. For this reason, for example, in the case of a side airbag device that is mounted on the back portion of the seat and the airbag is deployed and inflated from the back portion toward the front side of the vehicle, the pocket portion receives the pressure of the gas, Is easily developed toward the inner back direction of the pocket portion (for example, the vehicle upper side or the vehicle lower side). Then, at the end of expansion and expansion when the sub-deployment portion of the airbag is deployed and inflated, the pressure of the gas that has been dammed in the pocket portion is increased. Then, since the fragile portion is provided in the pocket portion, the fragile portion is torn by the pressure of the gas so that the gas can pass through the pocket portion, and the sub-deployment portion quickly expands and expands. Is done.
Furthermore, when the airbag is deployed and inflated, the thickness of the airbag is suitably regulated by the tether, and the passenger is effectively protected.

  Therefore, when the airbag is deployed and inflated, the airbag can be prevented from shifting from the position assumed in advance to the vehicle front side, and the deployed and inflated position of the airbag can be suitably controlled.

  According to a second aspect of the present invention, in the first aspect of the present invention, the pocket portion is sewed by a fragile yarn that is cut by receiving a gas pressure when the sub-deployment portion is expanded. It is a summary.

According to the said structure, it becomes possible to simplify the structure of a weak part.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the pocket portion is located on the inner surface of the sub-deployment portion in a region closer to the rear end portion than the central portion in the vehicle front-rear direction. The gist is that it is formed.

  According to the said structure, the force which expands an airbag toward the inner back direction (vehicle upper side or vehicle lower side) of a pocket part is suitably obtained because a pocket part receives the pressure of the said gas. For this reason, when the airbag is deployed and inflated, it is possible to effectively suppress the airbag from shifting from a position assumed in advance to the vehicle front side.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the bottom portion of the pocket portion is located on the opposite side of the gas generation source when viewed from the opening. However, the gist is that the width becomes narrower from the opening toward the bottom.

  According to the above configuration, in the initial stage of deployment in which the main deployment portion of the airbag is deployed and inflated, the bottom portion of the pocket portion is the leading end portion of the airbag. It becomes easy to enter between passengers seated on the seat. For this reason, the airbag is smoothly deployed and inflated.

The invention according to claim 5, and summarized in that in the invention as claimed in any one of claims 4, before distichum edge sewing attachment part which forms part of the pocket To do.

According to the said structure, it becomes easy to enlarge this pocket part by providing a pocket part so that a peripheral sewing part may become a part of pocket part.
The invention of claim 6 is the invention as claimed in any one of claims 5, before Kite Heather is summarized in that which forms part of the pocket portion.

According to the said structure, it becomes easy to enlarge this pocket part by providing a pocket part so that a tether may become a part of pocket part .

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the airbag is folded in a bellows shape in a direction in which the airbag is deployed and inflated, and the sub-deployment portion is The gist is that the case is housed in a state of being folded upward or downward.

  According to the above configuration, when the airbag is deployed and inflated, the folded sub-deployment portion is easily deployed upward or downward. For this reason, in particular, the sub-deployment portion of the airbag is unlikely to shift from the presumed deployment position to the vehicle front side.

  ADVANTAGE OF THE INVENTION According to this invention, the side airbag apparatus which can control the expansion | deployment inflating position of an airbag suitably can be provided.

(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.

  FIG. 1 shows a left front seat 21 as a seat disposed in the vehicle interior. The front seat 21 includes a seat portion 21a and a backrest portion 21b. A side airbag device 22 is embedded in the case 23 on the vehicle exterior side (left side) of the backrest 21 b of the front seat 21. The side airbag device 22 is disposed so as to correspond to a door (not shown) that constitutes a part of the body side portion of the vehicle. Although only the left front seat 21 is shown in the drawing, the same side airbag device 22 is also provided on the vehicle outer side (right side) of the backrest portion of the right front seat.

  As shown in FIGS. 1 and 2, the side airbag device 22 includes an inflator 24 as a gas generation source fixed inside a case 23, and an airbag 25 that covers the inflator 24. A gas generating agent for deploying and inflating the airbag 25 is accommodated inside the inflator 24. A gas injection port 24 a for injecting a gas generated from the gas generating agent is formed in the upper portion of the inflator 24. The inflator 24 is electrically connected to an impact sensor (not shown) for detecting an impact on the body side portion of the vehicle. That is, when an impact of a predetermined value or more is applied to the body side portion of the vehicle, gas is generated from the gas generating agent in the inflator 24 based on the detection signal from the sensor, and this gas is sent from the gas injection port 24a to the airbag 25. The air bag 25 is inflated and inflated toward the front side of the vehicle.

  The airbag 25 is formed so as to form a bag shape as a whole by sewing a pair of base fabrics 25a and 25b made of a woven fabric or the like at the periphery thereof. For this reason, the airbag 25 is provided with the periphery sewing part 26 which sewn the periphery of a pair of base fabric 25a, 25b. The airbag 25 according to the first embodiment is configured to expand and inflate between the body side portion of the vehicle and a portion from the head of the passenger P to the chest, and is normally folded. In this state, it is accommodated in the case 23.

  The airbag 25 includes a main deploying portion 27 that is deployed and inflated on the side of the chest of the occupant P, and a sub deploying portion 28 that is deployed and inflated on the side of the head of the occupant P. The development part 28 is formed integrally. That is, the main deploying portion 27 and the sub deploying portion 28 are in communication with each other, and are formed so as to form one bag. The inflator 24 is disposed at the rear end portion of the main development portion 27. The sub-deployment portion 28 includes a long tether 29 and a short tether 30 as tethers that regulate the thickness of the sub-deployment portion 28 when the sub-deployment portion 28 is expanded and expanded. That is, the long tether 29 and the short tether 30 are provided so as to bridge between the inner surfaces of the pair of base fabrics 25a and 25b. The long tether 29 is longer than the short tether 30, and both the tethers 29 and 30 have substantially the same width. The long tether 29 and the short tether 30 are disposed at a central lower end portion of the sub-deployment portion 28 at a predetermined interval, and both the tethers 29 and 30 extend in the vertical direction. The short tether 30 is disposed rearward of the long tether 29 and rearward of the central portion of the sub-deployment portion 28 in the front-rear direction.

  On the upper side of the short tether 30, a tear seam 31 as a fragile portion obtained by sewing and joining the two base fabrics 25a and 25b is formed so as to extend substantially linearly in the vertical direction. The lower end portion of the tear seam 31 overlaps with the upper end portion of the short tether 30, and the upper end portion of the tear seam 31 reaches the upper end of the sub-deployment portion 28. The tear seam 31 is sewn with a fragile thread that is cut by receiving gas pressure from the inflator 24 when the sub-deployment portion 28 is expanded. In this case, considering a desired cutting timing when the sub-deployment portion 28 is expanded and expanded, the sewing pitch of the tear seam 31 is preferably 4 mm or more and 8 mm or less, and the brittle yarn is made of polyester and has a density of 840 denier. .

  In the present embodiment, the pocket portion 32 is constituted by the rear peripheral sewing portion 26 a on the rear side of the tear seam 31 in the sub-deployment portion 28 among the short tether 30, the tear seam 31, and the peripheral sewing portion 26. That is, the short tether 30 and the rear periphery sewn portion 26 a together with the tear seam 31 constitute a part of the pocket portion 32. Therefore, the pocket portion 32 is formed in a region closer to the rear end portion than the center portion in the front-rear direction on the inner surface of the sub-deployment portion 28. The pocket portion 32 has an opening 33 formed between the lower end portion of the short tether 30 and the lower end portion of the rear periphery sewn portion 26a, and the opening portion 33 is on the gas injection port 24a side of the inflator 24. It is open toward. The pocket portion 32 has a bottom 34 located on the side opposite to the gas injection port 24 a of the inflator 24 when viewed from the opening 33, and becomes narrower toward the bottom 34 from the opening 33.

Here, the folding method of the airbag 25 for accommodating the airbag 25 of 1st Embodiment comprised as mentioned above in the case 23 is demonstrated.
As shown in FIG. 3A, the airbag 25 in a state before being folded has a planar shape in a state where the airbag 25 is expanded without supplying gas therein. First, mountain folds and valley folds are substantially equal along a two-dot chain line extending in a direction from the rear end portion to the front end portion of the airbag 25, that is, a direction in which the airbag 25 is deployed and inflated. Fold in a bellows shape by repeating at intervals. Thereby, the airbag 25 will be in the folding state shown in FIG.3 (b). When the upper end portion of the airbag 25 is folded downward from this state and then the upper end portion is further folded upward, the upper end portion of the airbag 25 is folded into an S shape as shown in FIG. It becomes a state. When the airbag 25 is folded so as to be compressed from the front and back from this state, the airbag 25 becomes small in volume and can be accommodated in the case 23 as shown in FIG.

  Next, the operation of the side airbag device 22 of the first embodiment configured as described above will be described with reference to FIGS. 1 and 2. Note that the airbag 25 is inflated and inflated through two stages: an initial stage of deployment in which the main deployment section 27 is deployed and inflated, and an end stage of deployment in which the sub-deployment section 28 is deployed and inflated.

  Now, when an impact of a predetermined value or more is applied to the body side portion of the vehicle, gas is injected and supplied into the airbag 25 from the gas injection port 24a of the inflator 24 as shown by an arrow in FIG. Then, at the initial stage of inflation and inflation of the airbag 25 due to this gas pressure, the main deployment part 27 is first deployed and inflated on the side of the chest of the passenger P, and part of this gas passes through the opening 33 and enters the pocket 32 Get in. At this time, the gas pressure that pushes the airbag 25 forward is reduced by at least the amount of gas that has entered the pocket portion 32. Since the gas that has entered the pocket portion 32 is blocked by the pocket portion 32, the bottom portion 34 of the pocket portion 32 is pushed upward by the pressure of the gas, and the airbag 25 is lifted upward.

  Then, at the end of the inflation and expansion of the airbag 25, the pocket portion 32 is filled with gas, and the gas pressure in the pocket portion 32 is increased. When this gas pressure exceeds the sewing strength of the tear seam 31 by the fragile thread, the tear seam 31 is torn by the gas pressure so that the gas is not blocked by the pocket portion 32 so that the gas can pass through the pocket portion 32. Become. For this reason, the gas spreads all over the sub-deployment portion 28 at once, and the sub-deployment portion 28 is rapidly expanded and expanded on the upper side of the main deployment portion 27 (the side of the head of the passenger P).

  Therefore, when the airbag 25 is deployed and inflated, the airbag 25 (particularly, the sub-deployment portion 28) can be prevented from shifting forward from the position assumed in advance by the action of the pocket portion 32. The deployed and expanded position is preferably controlled. As a result, the passenger P is suitably protected by the airbag 25.

According to the first embodiment described in detail above, the following effects are exhibited.
In the initial stage of deployment and expansion when the main deployment portion 27 of the airbag 25 is deployed and inflated, the gas injected from the inflator 24 can be blocked by the pocket portion 32. For this reason, by allowing the pocket 32 to receive the pressure of the gas, the airbag 25 (particularly the sub-deployment portion 28) can be lifted toward the upper side (the inner depth direction side of the pocket 32). 25 can be easily developed upward. In addition, the gas pressure for pushing the airbag 25 forward can be reduced by blocking the gas by the pocket portion 32.

  Then, at the end of expansion and expansion when the sub-deployment portion 28 of the airbag 25 is deployed and inflated, the pressure of the gas dammed in the pocket portion 32 is increased. Then, since the tear seam 31 is provided in the pocket portion 32, the tear seam 31 is torn by the pressure of the gas so that the gas can pass through the pocket portion 32, and the sub-deployment portion 28 can be quickly moved. Can be expanded and inflated. Therefore, when the airbag 25 is deployed and inflated, the airbag 25 (particularly the sub-deployment portion 28) can be prevented from shifting from the position assumed in advance to the front side, and the deployed and expanded position of the airbag 25 can be suitably set. Can be controlled.

Since the tear seam 31 is sewn with a fragile thread, the structure of the tear seam 31 is simple.
The pocket portion 32 is formed in a region on the inner surface of the sub-deployment portion 28 that is closer to the rear end portion than the center portion in the front-rear direction, so that the pocket portion 32 receives the gas pressure from the inflator 24, A force for deploying the airbag 25 upward can be suitably obtained. For this reason, when the airbag 25 is deployed and inflated, it is possible to effectively suppress the airbag 25 (particularly, the sub-deployment portion 28) from shifting from the position assumed in advance to the front side.

  The pocket portion 32 is narrower from the opening portion 33 toward the bottom portion 34, and at the initial stage of deployment in which the main deployment portion 27 of the airbag 25 is deployed and inflated, the bottom portion 34 of the airbag 25 is Since it becomes a front-end | tip part, directionality can be given and this airbag 25 can make it easy to enter between the body side part of the vehicle and the passenger P. For this reason, the airbag 25 can be rapidly and smoothly expanded and inflated.

  -Since the back periphery sewing part 26a and the short tether 30 comprise a part of pocket part 32, this pocket part 32 can be enlarged easily and formation of the pocket part 32 also becomes easy.

  -Since the long tether 29 and the short tether 30 are formed in the airbag 25, the thickness at the time of expansion | deployment of this airbag 25 can be controlled suitably, and passenger | crew P can be protected effectively. it can.

  Since the airbag 25 is folded in a bellows shape in the direction in which the airbag 25 is deployed and inflated, and the sub-deployment portion 28 is folded downward, the case 23 is accommodated in the case 23 so that the airbag 25 is folded when the airbag 25 is deployed and inflated. The sub-deployment portion 28 in the state is easily deployed upward. For this reason, it can suppress that it shifts ahead from the expansion | deployment position (namely, passenger | crew P side of passenger P) which assumed the subdeployment part 28 of the airbag 25 beforehand.

( Reference example )
Next, a reference example of the side airbag device will be described focusing on the differences from the first embodiment of the present invention .

As shown in FIG. 4, the airbag 25 of this reference example is configured to be inflated between a body side portion of the vehicle and a portion from the chest portion to the waist portion of the passenger P.

  As shown in FIGS. 4 and 5, the airbag 25 includes a main deployment portion 27 that expands and expands on the side of the chest of the occupant P, and a sub-deployment portion 28 that expands and expands on the side of the waist of the occupant P. The main deploying portion 27 and the sub deploying portion 28 are integrally formed. The inflator 24 is disposed at the rear end portion of the main development portion 27. In this embodiment, the gas injection port 24 a is provided in the lower part of the inflator 24.

  A tear seam 31 extending in the vertical direction is formed on the rear end side of the sub-deployment portion 28 in the front-rear direction. The upper end of the tear seam 31 is located below the gas injection port 24 a of the inflator 24, and the lower end of the tear seam 31 reaches the lower end of the sub-deployment portion 28. Therefore, a pocket portion 32 is formed by the tear seam 31 and the rear peripheral edge sewn portion 26 a of the sub-deployment portion 28 on the rear side of the rear seam 31 in the peripheral seam portion 26. The pocket portion 32 has an opening portion 33 opened at the upper end portion thereof toward the gas injection port 24a side of the inflator 24.

Here, the folding method of the airbag 25 for accommodating the airbag 25 of the reference example comprised as mentioned above in the case 23 is demonstrated.
First, as in the case of the airbag 25 of the first embodiment, the airbag 25 of the reference example is folded in a bellows shape in a direction in which the airbag 25 is deployed and inflated. Next, contrary to the case of the airbag 25 of the first embodiment, after the lower end portion of the airbag 25 of the reference example is folded upward, the lower end portion is further folded downward. Thereafter, similar to the case of the airbag 25 of the first embodiment, the airbag 25 of the reference example may be folded.

Next, the operation of the side airbag device 22 of the reference example configured as described above will be described with reference to FIGS.
When an impact of a predetermined value or more is applied to the vehicle body side portion, gas is injected and supplied into the airbag 25 from the gas injection port 24a of the inflator 24 as shown by an arrow in FIG. Then, at the initial stage of inflation and inflation of the airbag 25 by this gas pressure, the main deployment part 27 is first deployed and inflated, and part of this gas enters the pocket part 32 from the opening 33. At this time, the gas pressure that pushes the airbag 25 forward is reduced by at least the amount of gas that has entered the pocket portion 32. Since the gas that has entered the pocket portion 32 is blocked by the pocket portion 32, the bottom 34 of the pocket portion 32 is pushed downward by the pressure of the gas.

  Then, at the end of the inflation and expansion of the airbag 25, the pocket portion 32 is filled with gas, and the gas pressure in the pocket portion 32 is increased. When this gas pressure exceeds the stitching strength of the tear seam 31 by the fragile yarn, the tear seam 31 is torn by the gas pressure and the gas cannot be blocked by the pocket portion 32, and the gas can pass through the pocket portion 32. . For this reason, the gas spreads all over the sub-deployment portion 28 at once, and the sub-deployment portion 28 is rapidly expanded and expanded on the side of the waist of the passenger P.

  Therefore, when the airbag 25 is deployed and inflated, the airbag 25 (particularly, the sub-deployment portion 28) can be prevented from shifting forward from the position assumed in advance by the action of the pocket portion 32. The deployed and expanded position is preferably controlled. As a result, the passenger P is suitably protected by the airbag 25.

According to the reference example detailed above, the following effects are exhibited.
-In the initial stage of inflation when the main deployment portion 27 of the airbag 25 is deployed and inflated, the pocket portion 32 receives the gas pressure, so that the airbag 25 can be pushed downward and the airbag 25 is lowered It can be made easy to expand to the side.

  Then, at the end of the expansion and expansion stage when the sub-deployment portion 28 of the airbag 25 is deployed and inflated, the tear seam 31 is torn by the pressure of the gas so that the gas can pass through the pocket portion 32. Can be expanded and expanded quickly. Therefore, when the airbag 25 is deployed and inflated, the airbag 25 (particularly, the sub-deployment portion 28) can be prevented from shifting from the position assumed in advance to the front side.

  Since the airbag 25 is folded in a bellows shape in the direction in which the airbag 25 is deployed and inflated, and the sub-deployment portion 28 is folded back upward, it is accommodated in the case 23 so that it is folded when the airbag 25 is deployed and inflated. The sub-deployment portion 28 in the state is easily deployed downward. For this reason, it can suppress that it shifts ahead from the expansion | deployment position (namely, passenger | crew's P waist part side) which assumed the subdeployment part 28 of the airbag 25 beforehand beforehand.

(Example of change)
The first embodiment and the reference example can be modified and embodied as follows.
In-the first implementation embodiment and Reference Examples, the auxiliary deploying portion 28 may be provided on both the upper side and lower side of the main expansion portion 27. That is, the sub-deployment portion 28 that expands and expands on the side of the head of the occupant P above the main deployment portion 27 and the sub-deployment portion 28 that expands and expands on the side of the waist of the occupant P below the main deployment portion 27. Both may be provided.

- the first side air bag device 22 of the implementation form and reference examples was mounted on a rear seat of the vehicle, as the air bag 25 is deployed and inflated between the occupant P seated on the body side portion and the rear seat of the vehicle It may be configured.

In air bag 25 of the first embodiment may be omitted long tether 29 and the short tether 30 caries Chi hand.
-In the airbag 25 of 1st Embodiment, as shown to Fig.6 (a), the tear seam 31 is made into reverse L shape, and the pocket part 32 is comprised by this tear seam 31 and the peripheral sewing part 26. Also good.

-In the airbag 25 of 1st Embodiment, as shown in FIG.6 (b), the tear seam 31 is good also as an inverted V shape .

In air bag 25 of the first embodiment, as shown in FIG. 7, a straight line shape extending to the front obliquely downward tear seam 31 from the upper rear portion of the sub-expansion unit 28, in with the tear seam 31 and the peripheral sewn portion 26 You may make it comprise the pocket part 32. FIG. Furthermore, in this case, the strength of the fragile yarn constituting the tear seam 31 may be gradually increased toward the rear end side of the tear seam 31. In this way, at the end of the inflation and inflation of the airbag 25, the tear seam 31 is quickly ruptured from the front end side, so that the deployment and inflation time of the entire sub-deployment portion 28 can be shortened.

In-the first implementation embodiment and reference examples, the air bag 25 is only folded like bellows, then not necessarily folded upwards or downwards.

The side view which shows the expansion | deployment state of the airbag of 1st Embodiment. 1 is a side sectional view of an airbag according to a first embodiment. (A)-(d) is a side view which shows the folding method of the airbag of 1st Embodiment. The side view which shows the expansion | deployment state of the airbag of a reference example . Side part sectional drawing of the airbag of a reference example . (A) , (b) is sectional drawing which shows the airbag of the example of a change. Sectional drawing which shows the airbag of the example of a change.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 21 ... Front seat as a sheet | seat, 22 ... Side airbag apparatus, 23 ... Case, 24 ... Inflator as a gas generation source, 25 ... Air bag, 25a, 25b ... Base fabric, 26 ... Peripheral sewing part, 27 ... Main Development part, 28 ... Sub-deployment part, 29 ... Long tether as tether, 30 ... Short tether as tether, 31 ... Tear seam as weak part, 32 ... Pocket part, 33 ... Opening part, 34 ... Bottom part, P ... Boarding Person.

Claims (7)

An airbag that is deployed and inflated with a biasing force toward at least the front side of the vehicle between the body side portion of the vehicle and a passenger seated on a seat in the vehicle interior due to the pressure of the gas injected from the gas generation source is provided. In the side airbag device,
The airbag includes a main expansion portion is deployed and inflated chest side of the passenger, and a sub-expansion unit which expands and inflates at the head side of the passenger, the main expansion portion and the sub-expansion unit and is communication with And a pocket portion having an opening facing the gas generation source disposed in the main development portion is provided on the inner surface of the sub development portion. There is a fragile part that tears when the deployed part expands and expands,
The airbag is internally provided with a tether that regulates the thickness when the airbag is deployed and inflated,
The fragile portion is formed between a peripheral butt portion and a tether that are attached to the peripheral edges of a pair of base fabrics constituting the airbag,
The end portion of the tether is formed so as to overlap the end portion of the fragile portion. 2. The side airbag device according to claim 1, wherein the fragile portion is sewn in the pocket portion by a fragile yarn that is cut by receiving a gas pressure when the sub-deployment portion is deployed and inflated. 3. . 3. The side airbag according to claim 1, wherein the pocket portion is formed in a region closer to a rear end portion than a center portion in a vehicle front-rear direction on an inner surface of the sub-deployment portion. apparatus. 2. The pocket portion according to claim 1, wherein a bottom portion of the pocket portion is located on a side opposite to the gas generation source when viewed from the opening portion, and becomes narrower toward the bottom portion from the opening portion. The side airbag device according to any one of 3. Before distichum edge sewing attachment portion side air bag device according to any one of claims 1 to 4, characterized in that it constitutes a part of the pocket portion. Before Kite Heather the side airbag apparatus according to any one of claims 1 to 5, characterized in that it constitutes a part of the pocket portion. 7. The airbag according to claim 1, wherein the airbag is folded in a bellows shape in a direction in which the airbag is deployed and inflated, and further accommodated in a case with the sub-deployment portion folded upward or downward. The side airbag device according to any one of the above.

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