JP4466462B2 - Side airbag device - Google Patents

Description

  The present invention relates to a side airbag device including an airbag that is deployed between a body side portion of a vehicle and an occupant by gas generated from a gas generation source.

In general, when a side portion of an occupant seated on a vehicle seat is protected by an airbag, it is desirable to restrain the occupant's waist and shoulders with a restraining force stronger than that of the chest. As described above, for example, a side airbag device disclosed in Patent Document 1 is known as an airbag that has been developed in order to protect the occupant by increasing or decreasing the restraining force. The side airbag device includes an airbag provided with an upper compartment corresponding to the shoulder portion of the occupant, a lower compartment corresponding to the waist portion of the occupant, and an intermediate compartment corresponding to the thoracic portion of the occupant, When the airbag is deployed, the upper compartment and the lower compartment are deployed earlier than the intermediate compartment. As a result, the side airbag device restrains the occupant according to the body part of the occupant, thereby enabling effective and appropriate protection of the entire occupant body.
JP 2003-335210 A

  However, a person's physique varies greatly depending on age, sex, race, and the like. For this reason, the above-described conventional side airbag device still has room for improvement in order to exhibit protection performance in accordance with the occupant's physique.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the invention is to provide a side airbag device that can be easily protected appropriately in accordance with the physique of an occupant.

In order to achieve the above-mentioned object, the invention according to claim 1 is a side airbag device including an airbag that is deployed between a body side portion of a vehicle and an occupant by gas generated from a gas generation source. ,
The airbag includes an upper chamber, a central chamber, and a lower chamber, and the central chamber is partitioned from the upper chamber and the lower chamber,
The gas generation source includes a lower outlet for blowing the gas toward the lower chamber, and a central outlet for blowing the gas into the central chamber.
The side airbag device further includes physique detection means for detecting the physique of the occupant, and switching means for switching the blowing of the gas from the central outlet.
The switching means is set to blow out the gas from the central outlet when the occupant's physique detected by the physique detection means is larger than a standard physique , and the standard physique is defined by SID-IIs. When the dummy body is seated on the vehicle seat, the gist is that the central chamber is deployed on the side of the chest of the dummy body .

  According to this configuration, the gas generated from the gas generation source is blown into the lower chamber through the lower blowing port, and the lower chamber is expanded and the upper chamber is expanded. Further, the switching means detects the occupant's physique by the physique detection means and determines whether or not gas should be blown out from the central outlet.

  Here, when the occupant's physique is larger than the reference physique, the switching means causes the central chamber to expand by causing gas to be blown out from the central blowout port. In this case, the airbag restrains the side of the body of the large passenger by the lower chamber, the central chamber, and the upper chamber. On the other hand, when the occupant's physique is less than or equal to the reference physique, the switching means does not cause the gas to be blown from the central blowout port, so the central chamber is expanded without expanding. In this case, the airbag restrains the side of the occupant's body below the standard physique by the lower chamber and the upper chamber, and hardly exerts restraint force by the central chamber.

  The expansion of the central chamber means that the central chamber is filled with gas and expands, and an equal pressure higher than the atmospheric pressure is applied to all portions of the base fabric that forms the outer edge of the central chamber. Refers to the state. On the other hand, the expansion of the central chamber means that the base fabric forming the outer edge of the central chamber is stretched from the folded state in a state where the central chamber is not filled with gas. This occurs when the base chamber fabric is stretched to follow the expansion of the chamber and lower chamber.

  When the central chamber does not expand in this way, it is particularly advantageous that the occupant's chest is set to correspond to the side of the central chamber. In other words, an occupant having a standard physique or less is lighter than a large occupant, so that the inertial force applied to the entire body at the time of a side collision of the vehicle is small. Therefore, when protecting an occupant having a standard physique or less, it is desirable that the airbag is adjusted so as to exhibit an appropriate restraint force corresponding to the physique of the occupant. Thus, when adjusting the restraint force by an airbag, it is most advantageous to suppress the restraint force with respect to a passenger | crew's chest rather than the restraint force with respect to a waist | lumbar part and a shoulder part.

  The dummy body defined by the SID-IIs (Side Impact Dummy-second [II] generation small) was developed by an occupant protection research group “OSRP (Occupant Safety Research Partnership)” organized by an American automobile manufacturer. It has a size that is roughly equivalent to the size of a small adult woman.

If the multiplication members have a big physique than dummy body defined by SID-IIs, lower chamber, because none of the central chamber and the upper chamber is inflated, each part of the body toward the shoulder portion from the occupant's waist The entire airbag is restrained with a high restraining force. In this case, the lower chamber expands on the side of the waist of the large occupant, the central chamber expands on the side of the occupant's abdomen, and the upper chamber expands on the side of the occupant's shoulder. As a result, the lower chamber and the central chamber cooperate to strongly restrain the vicinity of the center of gravity of the occupant having a heavy weight (that is, the waist and the abdomen), so that high protection performance for the occupant is exhibited.

  On the other hand, when the occupant's physique is less than or equal to the physique of the dummy body defined by SID-IIs, the lower chamber and the upper chamber expand while the central chamber expands without expanding. In this case, the lower chamber and the upper chamber restrain the waist and shoulders of the small occupant, respectively, and the central chamber is arranged in a state where it is only deployed to the side of the occupant's chest, so it exerts little restraining force. . For this reason, a small occupant is restrained with a necessary and sufficient restraining force on the waist and shoulders, but is not exerted with an excessive restraining force on the chest.

The side airbag device according to claim 2 is the invention according to claim 1 , wherein the upper chamber and the lower chamber are communicated with each other through a communicating portion in the airbag, and the communicating portion is located in front of the central chamber. The gist of this is that

  According to this configuration, the central chamber is surrounded by the upper chamber, the lower chamber, and the communication portion that are inflated when the airbag is deployed, on the three sides (ie, the upper, lower, and front sides). For this reason, even when the central chamber does not expand, the base fabric of the central chamber is stretched so as to follow the expansion of the upper chamber, the lower chamber, and the communication portion, so that the central chamber develops into a desired shape. Therefore, the airbag can be deployed so as to always maintain a desired shape.

Side air bag device according to claim 3 is the invention according to claim 1 or claim 2, in the upper chamber is summarized in that the vent hole is provided.

  According to this configuration, the upper chamber can discharge gas to the outside of the airbag through the vent hole, so that the internal pressure can be kept lower than that of the lower chamber. For this reason, the occupant is most strongly subjected to the restraining force by the lower chamber that restrains the vicinity of the center of gravity, and as a result, high protection performance by the airbag is easily obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the side airbag apparatus which can aim at appropriate protection according to a passenger | crew's physique can be provided easily.

  Hereinafter, an embodiment in which a side airbag device of the present invention is embodied will be described in detail with reference to the drawings. In the following description, when explaining the direction, the forward direction of the vehicle is described as the front, and in the case of an airbag, the upper, lower, front, and rear are based on the airbag at the time of deployment. Stipulate.

  FIG. 1 (a) shows a seat 11 arranged in a vehicle cabin. The vehicle according to the present embodiment is provided with a driver seat side front seat and a passenger seat side front seat, and a rear seat for two or three people. As shown in the figure, each seat 11 includes a seat portion 11a and a backrest portion 11b. An inflator 12 as a gas generation source and a folded airbag 13 are embedded in a case (not shown) on the vehicle exterior side of each backrest portion 11b.

  Each inflator 12 is formed in an elongated shape extending along the backrest portion 11b. An upper blowout port 21, a central blowout port 22, and a lower blowout port 23 for blowing out gas generated from the inflator 12 are provided at the upper end portion, the central portion, and the lower end portion of each inflator 12. The upper outlet 21, the central outlet 22, and the lower outlet 23 are all located at the front end of the inflator 12 in order to blow out the gas generated from the inflator 12 toward the front of the vehicle.

  Each central outlet 22 is configured to be openable and closable so that the gas blown from the inflator 12 can be switched. Opening and closing of each central outlet 22 is controlled by switching means (not shown). The switching means is mounted on the vehicle as an electronic control unit (ECU), for example, and relates to the physique of the occupant P obtained from the physique detection means (not shown) provided to detect the physique of the occupant P seated on each seat 11. Based on the information, the opening and closing of each central outlet 22 is controlled.

  The physique detection means includes a known infrared sensor, a load distribution sensor, a CCD camera, a weight sensor, and the like arranged on the backrest portion 11b and the seat portion 11a of each seat 11 or an instrument panel. Such physique detection means includes the weight of the occupant P seated on each seat 11, the load distribution of the occupant P applied to each backrest portion 11 b, and the position of each part of the occupant P body relative to the seat 11 when seated on each seat 11. Etc. are detected. Further, as the physique detection means, it is also possible to use an IC chip in which information relating to the physique of the occupant P such as height, weight, and sitting height is stored.

  The switching means compares the physique of the occupant P seated on a certain seat 11 with a preset reference physique, and then opens or closes the central outlet 22 of the seat 11 based on the comparison result. The reference physique is desirably a physique of a dummy body defined by SID-IIs. The dummy body defined by SID-IIs refers to a dummy body developed by an occupant protection research group “OSRP” organized by an American automobile manufacturer, and has a size approximately equivalent to the size of a small adult woman.

  When the physique of the dummy body defined by SID-IIs is used as the reference physique, the switching means is configured such that the occupant P seated on a certain seat 11 is larger than the physique of the dummy body defined by SID-IIs. 11 central outlets 22 are opened. Conversely, when the occupant P seated on a certain seat 11 is less than or equal to the size of the dummy body defined by SID-IIs, the switching means closes the central outlet 22 of the seat 11.

  Each airbag 13 is formed in a bag shape by joining the peripheral edges of a pair of left and right base fabrics 30 formed in the same shape. Each airbag 13 is deployed toward the front of the vehicle from within a case embedded in the backrest portion 11b of the corresponding seat 11. FIGS. 1A and 1B and FIGS. 2A and 2B show the airbag 13 in a deployed state. As shown in the figure, each airbag 13 in the deployed state includes an upper chamber 31, a central chamber 32, and a lower chamber 33.

  In each airbag 13 in the deployed state, the upper outlet 21 of the inflator 12 is disposed at the rear end of the upper chamber 31, and the central outlet 22 of the inflator 12 is disposed at the rear end of the central chamber 32. A lower outlet 23 of the inflator 12 is disposed at the rear end of the lower chamber 33. Each inflator 12 independently fills the gas into the upper chamber 31, the central chamber 32 and the lower chamber 33 through the upper outlet 21, the central outlet 22 and the lower outlet 23.

  In each airbag 13 in the deployed state, the central chamber 32 is disposed approximately at the center between the upper and lower ends of the airbag 13 so as to be sandwiched between the upper chamber 31 and the lower chamber 33. Each central chamber 32 is substantially partitioned with respect to both the upper chamber 31 and the lower chamber 33 by connecting the left and right base fabrics 30 constituting the airbag 13 with a belt-like tether 34 in the vehicle width direction. Yes. That is, as shown in FIG. 1B, both side portions of the tether 34 in the longitudinal direction are respectively joined to the inner surfaces of the base fabrics 30 of the airbag 13 over the entire length of the tether 34. As shown in FIG. 1A, both ends of the tether 34 in the longitudinal direction are at positions between the upper outlet 21 and the central outlet 22 and between the central outlet 22 and the lower outlet 23. These are disposed so as to be in contact with (in close proximity to or in close contact with) the inflator 12.

  In each airbag 13 in the deployed state, a communication portion 36 that vertically connects the upper chamber 31 and the lower chamber 33 is provided in front of the central chamber 32. At the upper end portion of the communication portion 36, a notch portion for preventing the upper arm portion of the occupant P from being restrained more than necessary by notching a part of the front end portion of the upper chamber 31 toward the rear side of the vehicle. 37 is formed. That is, in this embodiment, the notch part 37 is arrange | positioned in the position corresponding to the upper arm part (refer Fig.1 (a)) prescribed | regulated by SID-IIs. Further, the central portion of the notch 37 is disposed above the upper end of the central chamber 32. Further, a vent hole 38 for discharging the gas in the airbag 13 is opened at the upper portion of the upper chamber 31 toward the body side portion (specifically, the window) of the vehicle.

  In the side airbag device of the present embodiment, when the airbag 13 is deployed in a state where the dummy body defined by SID-IIs is properly seated on the seat 11, the upper chamber is formed on the side of the shoulder portion of the dummy body. 31 is disposed, a central chamber 32 is disposed on the side of the chest, and a lower chamber 33 is disposed on the side of the waist (see FIG. 1A). That is, the upper end of the central chamber 32 is located below the shoulder of the dummy body, and the lower end of the central chamber is disposed above the waist of the dummy body. Note that “below the shoulder” means below the base of the arm, and “above the waist” means above the pelvis, specifically above the upper end of the iliac bone.

  As described above, the side airbag device according to the present embodiment includes the inflator 12, the airbag 13, the physique detection unit, and the switching unit. The side airbag device further includes an impact sensor that generates a detection signal when the vehicle receives an impact of a predetermined value or more.

Next, the operation of the side airbag device will be described below.
In the vehicle, for example, when the occupant P is seated on the seat 11 on the passenger seat side, the physique detection means detects the physique of the occupant P seated on the seat 11 and inputs the information to the switching means. The switching means compares the physique of the occupant P with the reference physique based on the input information related to the physique of the occupant P. When the occupant P seated on the passenger seat side seat 11 is larger than the physique of the dummy body defined by SID-IIs, the switching means maintains the central outlet 22 of the seat 11 in an open state. Conversely, when the occupant P is less than or equal to the size of the dummy body defined by SID-IIs (including the case where the occupant P is not seated on the seat 11), the switching means opens the central outlet 22 of the seat 11. Keep closed.

  When the vehicle receives an impact of a predetermined value or more, the impact sensor generates a detection signal and generates gas from each inflator 12. The gas generated from each inflator 12 deploys the airbag 13 of the corresponding seat 11.

  As shown in FIGS. 2 (a) and 2 (b), when the central outlet 22 is open, the gas generated from the inflator 12 flows into the upper outlet 21 as shown by the thick arrow in FIG. 2 (a). The air is blown through the central air outlet 22 and the lower air outlet 23 to expand the upper chamber 31, the central chamber 32, and the lower chamber 33, respectively. In the airbag 13 in the deployed state shown in FIGS. 2A and 2B, the upper chamber 31 includes a vent hole 38 in the upper portion, so that the internal pressure is suppressed slightly lower than that of the lower chamber 33. Further, since the central chamber 32 is surrounded by the tether 34 on three sides (that is, the upper side, the lower side, and the front side), excessive expansion in the vehicle width direction is restricted, and the upper chamber 31 and the lower chamber 33 are controlled. It expands thinner in the vehicle width direction.

  In the deployed airbag 13, all of the lower chamber 33, the central chamber 32, and the upper chamber 31 are inflated, so that each part of the body from the waist to the shoulder of the occupant P is more restrained by the entire airbag 13. Restrained by force. In this case, the lower chamber 33 expands on the side of the waist of the large passenger P, the central chamber 32 expands on the side of the abdomen of the passenger P, and the upper chamber 31 extends on the side of the shoulder of the passenger P. Inflate. As a result, the lower chamber 33 and the central chamber 32 cooperate to strongly restrain the vicinity of the center of gravity of the occupant P having a heavy weight (that is, the waist and the abdomen), so that high protection performance for the occupant P is exhibited. Moreover, the vicinity of the waist of the occupant P has the most excellent skeleton in terms of strength.

  On the other hand, as shown in FIGS. 1 (a) and 1 (b), when the central outlet 22 is closed, the gas generated from the inflator 12 is blown into the upper outlet as shown by the thick arrows in FIG. 1 (a). It blows out through the opening | mouth 21 and the lower blowing opening 23, and expands the upper chamber 31 and the lower chamber 33, respectively. In this case, the lower chamber 33 expands on the side of the waist of the small passenger P, and the upper chamber 31 expands on the side of the shoulder of the passenger P. Further, in the central chamber 32, the base fabric 30 forming the outer edge of the central chamber 32 is stretched in a form following the expansion of the upper chamber 31 and the lower chamber 33 without being filled with gas. Deploy on the side of the chest of the small passenger P. As a result, the lower chamber 33 and the upper chamber 31 cooperate to restrain the occupant P's body and sufficiently exhibit high protection performance against the lightweight occupant P, while the central chamber 32 is located on the chest side of the occupant P. It unfolds so as to cover the side, and exhibits appropriate protection performance without exerting an excessively high restraining force on the chest of the occupant P.

  In the present embodiment, the expansion of the central chamber 32 means that the central chamber 32 is filled with a gas and expands, and the central chamber 32 has a large expansion in all parts of the base fabric 30 that forms the outer edge of the central chamber 32. It refers to a state where a uniform pressure higher than atmospheric pressure is applied. On the other hand, the expansion of the central chamber 32 means that the base cloth 30 forming the outer edge of the central chamber 32 is stretched from the folded state in a state where the central chamber 32 is not filled with gas. The main fabric of the central chamber 32 is stretched mainly following the expansion of the upper chamber 31 and the lower chamber 33. However, in the present embodiment, when the airbag 13 is deployed, at least the upper chamber 31 and the lower chamber 33 are filled with gas and formed into a predetermined shape regardless of whether the central chamber 32 is filled with gas. It means to be done.

The effects exhibited by the embodiment will be described below.
-The side airbag apparatus of this embodiment is provided with the airbag 13 which consists of the upper chamber 31 and the lower chamber 33, and the central chamber 32 partitioned from these upper and lower chambers 31 and 33. As shown in FIG. Further, the side airbag device is provided with switching means for switching the blowing of gas into the central chamber 32 based on the physique of the passenger P. For this reason, in this side airbag device, since the deployment of the airbag 13 is appropriately controlled according to the physique of the occupant P, it is easy to appropriately protect the occupant P of various physiques. . In particular, for the large passenger P, the lower chamber 33 and the central chamber 32 strongly constrain the vicinity of the center of gravity of the passenger P to exert high protection performance. For the small passenger P, the central chamber 32 Since it is possible to reduce the restraining force on the chest of the occupant P, the protection according to the physique and skeleton of the occupant P can be achieved.

  -In the side airbag apparatus of this embodiment, it sets so that the blowing of the gas from the center blowing port 22 may be switched by making the physique of the dummy body prescribed | regulated by SID-IIs into a reference physique. For this reason, it is easy to ensure appropriate protection commensurate with the size of the occupant P.

  The airbag 13 includes a communication portion 36 in front of the central chamber 32. In other words, the central chamber 32 is surrounded by the upper chamber 31, the lower chamber 33, and the communication portion 36, all of which are inflated when the airbag 13 is deployed, on the three sides (that is, upper, lower, and front). For this reason, even if the central chamber 32 does not expand, the base fabric 30 of the central chamber 32 is stretched in a form that follows the expansion of the upper chamber 31, the lower chamber 33, and the communication portion 36. , It can be developed into a desired shape. Therefore, the airbag 13 can be deployed so as to always maintain a desired shape.

  Since the vent hole 38 is provided in the upper part of the upper chamber 31, the upper chamber 31 can maintain the internal pressure lower than that of the lower chamber 33. For this reason, the occupant P is most strongly subjected to the restraining force by the lower chamber 33 restraining the vicinity of the center of gravity, and as a result, high protection performance by the airbag 13 is easily obtained.

  In the airbag 13 in the deployed state, the central chamber 32 is disposed below the notch portion 37 (the center) for preventing the upper arm portion of the occupant P from being restrained more than necessary. Therefore, the central chamber 32 includes an occupant P (see FIG. 1A) having a physique equivalent to a dummy body defined by SID-IIs and an occupant P having a larger physique than the dummy body (FIG. 2). (See (a)) below the shoulder. Therefore, the central chamber 32 is always arranged at an appropriate position below the shoulder of the occupant P (specifically, the chest and / or the abdomen) regardless of the physique of the occupant P. It is possible to exhibit appropriate protection performance for the occupant P possessed.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
-You may set so that gas may not be blown out from the upper blower outlet 21. FIG. Even in this case, since the gas blown out from the lower outlet 23 is filled into the upper chamber 31 through the communication portion 36, the upper chamber 31 restrains the side of the shoulder portion of the occupant P in the same manner as in the above embodiment. Is possible. At this time, it is easier to increase the internal pressure of the lower chamber 33 than the upper chamber 31.

  -Instead of partitioning the central chamber 32 with the tether 34, by sewing the seam 41 between the left and right base fabrics 30 constituting the airbag 13, as shown in FIGS. The central chamber 32 may be partitioned. Further, instead of the seam 41, the left and right base fabrics 30 may be welded or bonded together.

  -Instead of partitioning the central chamber 32 by the tether 34, as shown in FIGS. 4A and 4B, the inner chamber 42 is provided inside the airbag 13 so that the central chamber 32 is partitioned. Good. However, the inner bag 42 needs to be joined to the left and right base fabrics 30 constituting the airbag 13 by a seam 43, welding, or adhesion along the boundary between the upper chamber 31 and the lower chamber 33. is there. In addition, the outer surface of the inner bag 42 and the inner surface of each base fabric 30 may be joined to the whole.

  In the above embodiment, the switching means switches between the case where the gas is blown out from the central outlet 22 and the case where the gas is not blown out. However, the switching means, in addition to the configuration for switching between the case where the gas is blown out from the central outlet 22 and the case where the gas is not blown out, in the case where the gas is blown out from the central outlet 22, You may comprise so that the timing to blow out may be adjusted.

  In the above embodiment, one inflator 12 is provided for each sheet 11, but a plurality of inflators 12 may be provided for each sheet 11. In this case, for example, the first inflator is configured to include a lower outlet 23 and an upper outlet 21, and the second inflator is configured to include a central outlet 22, and the switching means is configured such that the occupant P is larger than the reference physique. In this case, gas is generated from the second inflator, and gas is not generated from the second inflator when the occupant P is equal to or smaller than the reference physique.

Further, the technical idea that can be grasped from the embodiment will be described below.
The switching means is set so as to blow out the gas from the central outlet when the physique of the occupant is larger than the reference physique with the physique of the dummy body defined by SID-IIs as the reference physique. Tei Lusa Ido air bag device.

When the dummy body defined by SID-IIs is seated on the vehicle seat, the upper chamber is deployed on the side of the shoulder of the dummy body, and the central chamber is on the side of the chest of the dummy body. expanded, the lower chamber is the dummy body features and be Rusa id airbag apparatus to be deployed in the side of the waist.

- In the air bag deployment condition, the upper end of the central chamber is located below the shoulder of the dummy body, the lower end of the central chamber, wherein the to salicylate id to be positioned above the waist of the dummy body Airbag device.

- said gas source further features and to salicylate id airbag device that includes an upper air outlet for blowing the gas toward the upper chamber.

· The above central chamber, the occupant of the upper arm features and be Rusa id airbag device that notch is provided in order to avoid tying than necessary.

- said central chamber, between the left and right of the base fabric constituting the airbag, by bonding through the tether, the upper chamber and wherein the to salicylate id airbag that is partitioned and the lower chamber apparatus.

- said central chamber, said by joining at the seam between the left and right of the base fabric constituting the airbag, features and be Rusa id airbag apparatus that is partitioned with the upper chamber and the lower chamber.

(A) is a side view schematically showing a deployment state of an airbag when a small occupant is seated on a seat, and (b) is an end view of the airbag along the line 1b-1b in FIG. 1 (a). (A) is a side view schematically showing the airbag in a deployed state when a large occupant is seated on a seat, and (b) is an end view of the airbag along line 2b-2b in FIG. 2 (a). It is sectional drawing which shows typically the deployment state of the airbag of the modification, Comprising: (a) is the state which the center chamber has not expanded, (b) shows the state which the center chamber expanded. It is sectional drawing which shows typically the deployment state of the airbag of the modification, Comprising: (a) is the state which the center chamber has not expanded, (b) shows the state which the center chamber expanded.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Sheet | seat, 12 ... Inflator as a gas generation source, 13 ... Air bag, 22 ... Central outlet, 23 ... Lower outlet, 31 ... Upper chamber, 32 ... Central chamber, 33 ... Lower chamber, 36 ... Communication part, 38 ... Benthole, P ... Crew.

Claims (3)

In a side airbag device including an airbag that is deployed between a body side portion of a vehicle and an occupant by gas generated from a gas generation source,
The airbag includes an upper chamber, a central chamber, and a lower chamber, and the central chamber is partitioned from the upper chamber and the lower chamber,
The gas generation source includes a lower outlet for blowing the gas toward the lower chamber, and a central outlet for blowing the gas into the central chamber.
The side airbag device further includes physique detection means for detecting the physique of the occupant, and switching means for switching the blowing of the gas from the central outlet.
The switching means is set to blow out the gas from the central outlet when the physique of the occupant detected by the physique detection means is larger than a reference physique ,
The reference physique is a physique of a dummy body defined by SID-IIs,
When the dummy body is seated on the vehicle seat, the central chamber is deployed on the side of the chest of the dummy body . 2. The side airbag device according to claim 1, wherein the upper chamber and the lower chamber communicate with each other through a communication portion in the airbag, and the communication portion is disposed in front of the central chamber . The side airbag device according to claim 1, wherein the upper chamber is provided with a vent hole .

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