JP4325444B2 - Side airbag device - Google Patents

Description

  The present invention provides, for example, a side airbag including an airbag that inflates and deploys between a side wall of the vehicle body and an occupant seated on a seat disposed in the vehicle interior when an impact of a predetermined level or more is applied to the vehicle body. It relates to the device.

In recent years, as this type of side airbag device, as shown in the plane of FIG. 12, there is one which is embedded in a side portion on the vehicle exterior side of a backrest portion 115 connected to a seating portion 114 of a vehicle seat 112. In the side airbag device, the airbag 131 is inflated and deployed between the side portion of the body from the side portion of the backrest portion 115 toward the front in the traveling direction, that is, between the side door 116 and the occupant P ′ when the vehicle collides. It has become. (See Patent Document 1 and Patent Document 2)
JP 2002-362295 A Japanese Patent No. 2933894

  In the conventional side airbag device described above, when the airbag 131 is inflated and deployed (completed), the thickness in the vehicle width direction of the front end portion corresponding to the elbow portion Pe ′ of the arm of the occupant P ′ as shown in FIG. Since the size is increased, the elbow Pe ′ is excessively pressed inward in the vehicle width direction. For this reason, the upper arm of the occupant is excessively rotated inward in the vehicle width direction by the airbag 131 with the shoulder as the center, and there is a problem that the chest of the occupant is strongly pressed.

  The present invention has been made paying attention to the problems existing in the above-described conventional technology. The purpose is to prevent the occupant's elbow from being excessively pressed inward in the vehicle width direction when the airbag is inflated and deployed between the occupant seated on the seat and the side wall of the vehicle body, An object of the present invention is to provide a side airbag device capable of appropriately protecting a passenger's chest.

In order to solve the above problems, the invention according to claim 1 is configured such that when a predetermined impact or more is applied to a vehicle body, the vehicle is seated on a seat disposed in a side wall portion of the vehicle body and a room inside the vehicle body. An airbag that inflates and deploys to and from the occupant, and a gas generation source for inflating and deploying the airbag. The airbag is provided at a side edge portion of the seat backrest outside the vehicle, It is configured to expand and deploy in a space between the side wall portion of the body and the occupant toward the front in the traveling direction, and protects at least the lumbar portion and the chest portion of the occupant's waist, chest, shoulder, and head. in it are side air bag device, in a state in which the airbag is inflated and deployed by the gas, so that the thickness dimension of the air bag at a position corresponding to the elbow of the passenger's arm is smaller than the other portions Tadashi The thickness regulating portion for providing is formed expansion part by gas all around the thick-viewed regulating unit, in the deployed state of the airbag, forward traveling direction and downward of the vehicle than the thickness restricting portion of the expansion portion And a waist protection portion provided behind the thickness regulating portion in the vehicle traveling direction. The narrow expansion portion has an arc shape when viewed from the side and has a radial width. The shortest distance between the front end of the thickness restricting portion and the front end of the airbag is shorter than the shortest distance between the rear end of the thickness restricting portion and the rear end of the airbag. In addition, the gist is that the thickness dimension of the narrow expansion portion is smaller than the thickness dimension of the waist protection portion .

  According to this configuration, when the airbag is inflated and deployed, the elbow portion of the occupant is disposed at a position where it can contact the thickness regulating portion. That is, since the entire circumference of the thickness restricting portion is surrounded by the inflating portion having a larger thickness, the gas supplied to the inflating portion exerts a uniform tension on the thickness restricting portion. As a result, the deployment shape of the airbag is stabilized, the thickness regulating portion in the airbag during inflation and deployment is properly positioned, and the thickness regulating portion is quickly disposed at a position corresponding to the occupant's elbow. . Furthermore, at this time, since the thickness restricting portion has a smaller thickness dimension in the vehicle width direction than other portions including the inflating portion, the occupant's elbow portion is not excessively pressed inward in the vehicle width direction. Therefore, excessive pressing of the occupant's chest via the elbow when the airbag is inflated and deployed is avoided, and the chest is properly protected. At this time, the thickness restricting portion appropriately restricts the increase in the thickness dimension of the expanding portion. In addition, the said elbow part shall include an elbow and its circumference | surroundings.

  According to this configuration, the airbag at the time of inflating and deploying protects the occupant's waist and chest, so that the occupant is properly and effectively protected against the side wall of the body. Furthermore, since the base end portion of the airbag at the time of inflating and deploying is disposed around a position corresponding to the chest of the occupant, the protection performance for the chest is particularly excellent.

  According to this configuration, the narrow expansion portion having an arc shape facilitates smooth and uniform gas inflow, and is less likely to be crushed or deformed. Further, since the narrow inflated portions are formed to have substantially the same width, the narrow inflated portions are inflated and deployed so that the thickness dimensions of the narrow inflated portions are substantially equal. For this reason, inflow of gas is performed more smoothly and uniformly, and the narrow expansion portion is further less likely to be crushed or deformed.

The invention according to claim 2, in the side airbag apparatus according to claim 1, wherein the airbag comprises a pair of base fabric facing each other, the thickness regulating unit, the reinforcing between the two base fabric The gist is that the cloth is sewn with a sewing thread. According to this configuration, the thickness regulating portion is reinforced by the reinforcing cloth, and the shape at the time of expansion and deployment is easily stabilized.

According to a third aspect of the present invention, in the side airbag device according to the first or second aspect , the thickness regulating portion is divided into a plurality of portions, and a gas passage is formed between the thickness regulating portions. This is the gist.

  According to this configuration, the gas flows directly into the inflatable portion on the tip end side of the airbag through the gas passage formed between the thickness regulating portions. For this reason, a part of the gas from the gas generation source flows through a path that connects the base end portion and the tip end portion of the airbag at a shortest distance without greatly bypassing the periphery of the thickness regulating portion. The inflow of gas to the front end of the airbag proceeds smoothly. Further, at this time, since the gas easily spreads over the entire airbag including the tip at the very initial stage of the inflation and deployment, the behavior of the airbag during the inflation and deployment is easily stabilized.

The gist of the invention according to claim 4 is that, in the side airbag device according to any one of claims 1 to 3 , the thickness regulating portion is formed in a circular shape.
According to this configuration, the flow of gas flowing into the front end portion of the airbag through the peripheral edge of the circular thickness regulating portion can be easily smoothed. Furthermore, the gas in the expansion part tends to exert a uniform tension on the thickness regulating part.

Invention of Claim 5 is a side airbag apparatus as described in any one of Claims 1-4 . WHEREIN: The said thickness control part is below the main gas flow direction injected from the gas injection nozzle of an inflator. Alternatively, the gist is offset upward.

  According to this configuration, most of the gas injected from the gas injection nozzle reaches the front end portion of the airbag without being obstructed by the thickness regulating portion. At this time, since the flow velocity of the gas flowing along the main gas flow direction is not easily attenuated, it is possible to spread the gas throughout the airbag, and the deployment speed of the airbag is improved. Furthermore, the impact of gas on the thickness restricting portion can be easily reduced.

According to the first to fifth aspects of the present invention, since the elbow portion of the occupant's arm is not excessively pressed in the inflated and deployed state of the airbag, appropriate protection of the occupant's chest can be achieved.
In addition, it is possible to rapidly inflate and deploy the narrow inflatable portion, prevent the bending thereof, and more appropriately protect the occupant.

According to the invention described in claim 2 , in addition to the effect of the invention described in claim 1, the strength of the thickness restricting portion is ensured to prevent the thickness restricting portion from being damaged when the airbag is inflated and deployed. be able to.

In the third aspect of the present invention, the thickness regulating portion is divided into a plurality of portions, and gas passages are formed between the thickness regulating portions, so that the gas is rapidly circulated into the narrow expansion portion. Inflating and deploying can be performed more quickly, and the occupant can be protected more appropriately.

In the invention according to claim 4 , since the thickness restricting portion is formed in a circular shape, the gas is rapidly circulated into the narrow inflating portion, the inflating and expanding thereof is performed more quickly, and the occupant is protected. Can be performed more appropriately.

In the invention according to claim 5 , since the thickness restricting portion is offset below or above the main gas flow direction injected from the gas injection nozzle of the inflator, the gas sneaks quickly into the narrow expansion portion. The expansion and deployment of the occupant can be performed more quickly, and the occupant can be protected more appropriately.

Below, one Embodiment which actualized the side airbag apparatus of this invention is described based on FIGS. 1-4.
FIG. 1 shows a side surface of a vehicle seat, and FIG. 2 shows a cross section taken along line 2-2 of FIG. As shown in FIG. 2, a seat 12 on which a passenger P is seated is mounted on the bottom 11 of the vehicle body. The seat 12 is mounted on the bottom 11 of the body through a front / rear position adjustment mechanism 13 so that the position of the vehicle in the traveling direction can be adjusted, and a backrest mounted on the rear end of the seat 14. Part 15. A side airbag device 17 is attached to the backrest 15.

Next, a schematic configuration of the side airbag device 17 embedded in the backrest 15 will be described.
As shown in FIG. 4, the side airbag device 17 according to the present embodiment includes an airbag formed into a bag shape by sewing a pair of base fabrics 18a and 18b made of, for example, a woven fabric subjected to flameproofing. 18, an inflator 19 as a gas generation source enclosed by a base end portion of the airbag 18, and a case 20 for housing the airbag 18 and the inflator 19. As shown in FIG. 1, the case 20 is attached to a frame (not shown) of a backrest portion 15 of a vehicle seat 12, and is embedded in an end portion of the backrest portion 15 on the side door 16 side as a side wall portion of the body. Has been. The side door 16 is provided with a sensor (not shown) that detects an impact applied to the door from the side of the vehicle. This sensor is connected to the inflator 19 via a control circuit (not shown).

Next, a specific configuration of the airbag 18 will be described in detail.
The airbag 18 that is inflated and deployed in a side shape shown in FIGS. 1 and 4 is accommodated in the case 20 in a folded state. The airbag 18 is inflated and deployed toward the front in the vehicle traveling direction with respect to a space formed between the occupant P sitting on the seat 12 and the side door 16.

  The outer peripheral edge portions of the two base fabrics 18 a and 18 b constituting the airbag 18 are connected to each other by a sewing thread 21. The gas injected from the gas injection nozzle 19a of the inflator 19 is supplied to the inside of the airbag 18 as shown by the broken arrow in FIG. As shown in FIG. 1, the airbag 18 is provided with a thickness regulating portion 22 for regulating the thickness of the airbag 18 at a position corresponding to the elbow Pe of the occupant P seated on the seat 12. As shown in FIG. 3, the elbow part Pe includes an elbow El (arm bending part) of the occupant P and its periphery. The circumference of the elbow El preferably includes the upper arm UA (between the shoulder Sh and the elbow El) and the forearm FA (between the elbow El and the wrist Wr), and particularly preferably the lower part of the upper arm UA (shoulder Sh and elbow). It includes the elbow El side from the midpoint of El and the upper part of the forearm FA (lower arm) (elbow El side from the midpoint of elbow El and wrist Wr).

  The thickness restricting portion 22 is formed so that the entirety thereof is located inside the outer peripheral edge of the airbag 18, and an inflatable portion described later is formed over the entire outer periphery of the thickness restricting portion 22. The shape seen from the side surface of the thickness restricting portion 22 is substantially a sector shape. As shown in FIG. 2, the thickness restricting portion 22 is formed in a flat shape by sewing with a sewing thread 24 with a reinforcing cloth 23 interposed between the base cloths 18a and 18b. That is, the reinforcing cloth 23 is formed of a cloth having a substantially fan shape corresponding to the side surface shape of the thickness regulating portion 22. And the thickness control part 22 is formed by sewing with the sewing thread 24 in the state which has arrange | positioned the reinforcement cloth 23 in the part which both base fabrics 18a and 18b mutually oppose. With this configuration, the thickness restricting portion 22 is reinforced by the reinforcing cloth 23 and the thickness dimension is increased, and the shape of the airbag 18 at the time of inflation and deployment is easily stabilized.

  4, the shortest distance d1 between the front end of the thickness regulating portion 22 and the front end of the airbag 18 is the rear end of the thickness regulating portion 22 and the rear end of the airbag 18. It is shorter than the shortest distance d2 between the parts. Further, in the airbag 18, the shortest distance between the front end of the thickness regulating portion 22 and the front end of the airbag 18 is also the airbag 18 in a state where the base fabrics 18 a and 18 b to which no gas is supplied are expanded. The distance is shorter than the shortest distance between the rear end of the thickness regulating portion 22 and the rear end of the airbag 18. That is, the thickness restricting portion 22 is disposed on the front side (the front end portion side of the airbag 18) from the center of the airbag 18 in the front-rear direction.

  With this configuration, the distal end portion (front end portion) of the airbag 18 at the time of inflation and deployment has a thickness dimension smaller than that of the central portion of the airbag 18 behind the thickness regulating portion 22, and the occupant P and the side seated on the seat 12. It expands and deploys quickly and smoothly in a narrow space between the door 16 and the door 16. Furthermore, since the thickness dimension of the front end portion of the airbag 18 is small, it is difficult to excessively press the forearm FA inward in the vehicle width direction, and the center portion of the airbag 18 behind the thickness regulating portion 22 is Even when pressed outward in the width direction, the thickness dimension of the tip of the airbag 18 does not increase by a predetermined amount or more.

  The airbag 18 above the thickness regulating portion 22 is formed with a chest protecting portion 25 for protecting the chest of the occupant P. The airbag 18 behind and below the thickness regulating portion 22 has a waist portion of the occupant P. A waist protection part 26 for protecting the body is formed. The chest includes the chest of the occupant P (between the upper and lower ends of the ribs), and preferably includes a region (between the shoulder and the waist) composed of the chest and the abdomen. The waist includes the waist of the occupant P (between the upper and lower ends of the pelvis), preferably the waist and the thigh (between the hip joint and the knee joint), and particularly preferably the waist and the upper thigh (the hip and knee joint). Including the midpoint). In the present embodiment, the airbag 18 in an inflated and deployed state is disposed at a position where the front portion of the chest protection portion 25 corresponds to the front end portion of the chest of the occupant P when viewed from the side as shown in FIG. The central part of the waist protection part 26 located behind the restriction part 22 is disposed at a position corresponding to the waist of the occupant P.

  A narrow inflatable portion 27 for protecting the elbow Pe in cooperation with the thickness restricting portion 22 is formed in the airbag 18 in front of and below the thickness restricting portion 22. The chest protection part 25 and the waist protection part 26 are configured to be larger than the thickness dimension of the narrow expansion part 27 as shown in FIGS. The narrow expansion portion 27 is formed in a substantially quadrangular arc shape when viewed from the side, and has the same width dimension. That is, the outer peripheral edge from the front end portion to the lower end portion of the airbag 18 in a state where the base fabrics 18a, 18b to which no gas is supplied is expanded is the outer peripheral edge from the front end portion to the lower end portion of the thickness regulating portion 22 It is formed so as to be almost equally spaced.

  In this embodiment, the breast protection part 25, the waist protection part 26, and the narrow expansion part 27 form an expansion part over the entire outer periphery of the thickness regulating part 22. In addition, when the airbag 18 of the present embodiment is inflated and deployed, the airbag 18 is arranged at the height of the chest from the waist of the occupant P having a standard adult physique, and from the back of the back of the occupant P. It arrange | positions so that it may extend in the front-back direction to the front. The energizing harness 19b connected to the other end of the inflator 19 is led out of the airbag 18 through the gap S between the base fabrics 18a and 18b that are not sewn with the sewing thread 21. The gap S has a function as a vent hole for releasing gas to the outside after the airbag 18 is inflated and deployed.

  In the side airbag device 17 configured as described above, an operation signal is output to the inflator 19 via the control circuit when an impact of a predetermined level or more is detected by a sensor provided on the side door 16. Then, the inflator 19 instantaneously injects gas into the airbag 18 based on this operation signal. As shown in FIGS. 1 and 3, the airbag 18 is inflated and deployed instantaneously in the forward direction of the vehicle as shown in FIGS. 1 and 3, and is sandwiched between the side door 16 and the occupant P. The occupant P is protected by the waist protecting portion 26 and the narrow inflating portion 27. At this time, the chest protector 25 of the airbag 18 is deployed to the side of the chest, the waist protector 26 is deployed to the side of the waist, and the narrow inflatable unit 27 is deployed to the side of the elbow Pe, respectively. Protect each part.

  In the airbag 18 in the inflated and deployed state, the thickness dimension (vehicle width direction) of the central portion of the waist protection portion 26 is the largest because the thickness regulating portion 22 is located in front of the center of the airbag 18. Large and closest to occupant P. On the other hand, the chest protection portion 25 is located between the thickness regulating portion 22 and the periphery of the airbag 18 (the portion where the base fabrics 18a and 18b are sewn together), and from the center portion of the waist protection portion 26. The thickness dimension is slightly smaller, and is slightly separated from the occupant P than the center part of the waist protection part 26. Therefore, in the airbag 18 in the inflated and deployed state, the center portion of the waist protection portion 26 strongly presses the occupant P inward in the vehicle width direction, and the chest protection portion 25 presses the occupant P in the same direction with an appropriate pressing force. Press.

  Further, as described above, the narrow inflating portion 27 has a smaller thickness than the chest protecting portion 25 and the waist protecting portion 26, and the pressing force on the elbow Pe is relatively small compared to the waist and the chest. As a result, even when the waist is strongly pressed inward in the vehicle width direction, the pressing force in the same direction against the elbow Pe is small, and the airbag 18 does not excessively press the chest via the elbow Pe. As a result, the chest of the occupant P is properly protected. The gas in the inflated airbag 18 is discharged to the outside through the gap S that functions as a vent hole, and the airbag 18 is reduced.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) According to the side airbag device 17, in the state where the airbag 18 is inflated and deployed between the side door 16 and the occupant P as shown in FIGS. A thickness regulating portion 22 was formed on the airbag 18 so as to correspond. For this reason, when the airbag 18 is in the deployed state, the elbow Pe corresponds to the thickness regulating portion 22 and the excessive pressing operation of the elbow Pe toward the inner side in the vehicle width direction can be eliminated. It is possible to avoid excessive compression of the chest and protect the occupant P appropriately.

  (2) In the side airbag device 17, the narrow inflating portion 27 is formed in front of and below the thickness regulating portion 22. For this reason, it is possible to prevent the thickness restricting portion 22 from being bent by the narrow inflating portion 27, and it is possible to stabilize the posture of the thickness restricting portion 22 in the deployed state and to reliably protect the occupant P.

  (3) In the side airbag device 17, the narrow inflated portion 27 of the airbag 18 is formed in a quarter arc shape when viewed from the side and the width dimension is substantially the same. For this reason, when the airbag 18 is inflated and deployed, the gas rapidly enters the narrow inflatable portion 27 and the narrow inflatable portion 27 is unlikely to be bent, and the inflating and deploying operation is reliably performed. Protection can be performed properly.

  (4) In this side airbag device 17, the reinforcing fabric 23 is interposed between the base fabrics 18 a and 18 b constituting the airbag 18, and the thickness regulating portion 22 having a three-layer sheet structure is formed by the sewing thread 24. The breaking strength of the thickness restricting portion 22 when the airbag 18 is inflated and deployed can be increased.

(Modification)
Each of the above embodiments may be modified as follows.
-As shown in FIG. 5, you may provide the side airbag apparatus 17 in the seating part 14 of the sheet | seat 12. As shown in FIG. At this time, it is good to comprise so that the rear-end part (base end part) of the side airbag apparatus 17 of the said embodiment may be arrange | positioned at the seating part 14. FIG. Moreover, although not shown in figure, the side airbag apparatus 17 can also be provided in the side wall part of a body. Even in these configurations, the elbow Pe of the arm of the occupant P is not excessively pressed, so that the chest can be properly protected.

  As shown in FIG. 6, the thickness restricting portion 22 may be formed in a circular shape so that the gas injected from the gas injection nozzle 19 a of the inflator 19 passes above the thickness restricting portion 22. In other words, you may arrange | position so that the thickness control part 22 may be offset below the main gas flow direction B injected from the gas injection nozzle 19a. In this case, the flow of the main gas injected from the gas injection nozzle 19a does not collide with the thickness restricting portion 22, so that the gas wraps around the narrow inflating portion 27 quickly, and the expansion of the narrow inflating portion 27 is expanded. Is done quickly. Further, since the thickness regulating portion 22 has a circular shape, the gas sneaks quickly into the narrow expansion portion 27, and the deployment speed (time until complete expansion) and the stability of the deployment behavior are improved.

In the modification shown in FIG. 6, the gas injection nozzle 19 a of the inflator 19 may be changed to the lower side and offset so that the thickness regulating portion 22 is located on the upper side in the gas flow direction B.
As shown in FIG. 7, the thickness regulating portion 22 is divided into two, and a gas passage 29 is formed between the circular outer thickness regulating portion 22A and the circular lower thickness regulating portion 22B. You may do it. In this case, even if the main gas flow direction B injected from the gas injection nozzle 19a collides with the upper thickness restricting portion 22A, the gas easily flows from the gas passage 29 to the narrow expansion portion 27 side, and is expanded and deployed. Operation is performed smoothly. Further, the thickness dimension of the thickness restricting portion 22 can be easily adjusted by changing the size and interval of the circular outer and lower thickness restricting portions 22A and 22B.

In the modification shown in FIG. 7, the gas flow direction B may be directed to the gas passage 29 between the outer thickness regulating portion 22A and the lower thickness regulating portion 22B.
As shown in FIG. 8, the main gas flow direction B from the gas injection nozzle 19a of the inflator 19 may be directed directly above the upper thickness regulating portion 22A. In this case, as compared with the modified example shown in FIG. 7, the gas wraps around the narrow expansion portion 27 more quickly, and the expansion and deployment operation of the narrow expansion portion 27 is performed more reliably.

  As shown in FIG. 9, the inflator 19 is moved to the lower side of the airbag 18, and the main gas flow direction B from the gas injection nozzle 19a is changed between the upper and lower thickness regulating portions 22A and 22B. The passage 29 may be directed. Also in this modified example, the gas is rapidly circulated to the narrow expansion portion 27 through the passage 29.

  As shown in FIG. 10, the inflator 19 may be turned upside down so that the gas injection nozzle 19 a faces downward, and the main gas flow direction B may be directed to the gas passage 29.

-As shown in FIG. 11, you may make it the main gas flow direction B of the gas injection nozzle 19a point below the lower side thickness control part 22B.
The side airbag device 17 shown in the modified examples of FIGS. 6 to 11 is attached to the side edge portion on the vehicle outer side of the backrest portion 15 of the vehicle seat 12 so as to be inflated and deployed toward the front in the traveling direction of the vehicle. Although configured, the side airbag device 17 configured as shown in FIGS. 6 to 11 may be provided on the seating portion 14 of the seat 12 as shown in the modification of FIG. 5, for example. At this time, the base end portion of the airbag 18 and the inflator 19 are provided on the side edge portion on the vehicle outer side of the seating portion 14 of the seat 12 and configured to inflate and deploy upward. Further, at this time, the main gas flow direction injected from the gas injection nozzle 19a of the inflator 19 is upward, and the thickness regulating portion 22 is offset forward or backward in the vehicle traveling direction from the main gas flow direction. Even in such a configuration, most of the gas injected from the gas injection nozzle 19a reaches the front end portion (upper end portion) of the airbag 18 without being obstructed by the thickness regulating portion 22. The deployment speed can be easily increased.

A predetermined gap may be formed inside the thickness regulating portion 22 so that gas can enter the gap.
In the above embodiment, the case 20 may be omitted as long as the airbag 18 is suitably accommodated and suitably inflated and deployed.

  In the above embodiment, the inflator 19 is embedded in the end portion on the side door 16 side in the backrest portion 15 of the seat 12. On the other hand, the inflator 19 may be provided in another portion after the gas can be ejected into the airbag 18.

  In the above embodiment, the thickness restricting portion 22 is formed so that the shape viewed from the side of the vehicle is substantially a fan shape or a circular shape. You may change into shapes, such as a square shape, trapezoid shape, or the same shape as the shape of an elbow part. Moreover, you may provide these thickness control parts 22 in multiple places of three or more places.

The thickness regulating portion 22 may be formed by locally connecting the base fabrics 18a and 18b constituting the airbag 18.
In the above embodiment, the airbag 18 for protecting the occupant's lower back and chest is embodied as an airbag 18 for protecting the shoulder in addition to the lower back and chest, and the lower back, chest, and shoulder. You may embody in the airbag for protecting a part and a head.

Further, the technical idea that can be grasped from the embodiment will be described below.
The airbag apparatus according to claim 2 or 3, wherein the thickness regulating portion is offset downward or upward from a main gas flow direction injected from a gas injection nozzle of the inflator. The thickness regulating portion, features and to Rue airbag apparatus that are offset forward or rearward from the main gas flow direction to be injected from the gas injection nozzles of the inflator.

· The thickness regulating section features and be Rusa id airbag device that is positioned further forward than the front-rear direction center of the airbag inflated and deployed state.
- vertical center that features and to salicylate id airbag device which is positioned lower than while positioned in front of the front-rear direction center of the thickness regulating section airbag inflated and deployed state.
· The thickness restricting unit that features and to salicylate id airbag device which is positioned above the vertical center of the airbag inflated and deployed state.

· The thickness regulating section features and be Rusa id airbag apparatus that is located at the distal end side than the center of the airbag inflated and deployed state.
· The inflatable section, you and chest protecting portion for protecting the occupant's chest, and waist protection portion that protects the occupant lumbar region, characterized by comprising a narrow expansion section to protect an occupant of the elbow airbags apparatus.
· The narrow expansion section characteristics and to Rue airbag device that is configured to protect the elbow of the occupant in cooperation with the thickness restricting unit.

The side view which shows the sheet | seat in which the side airbag apparatus of this embodiment is provided, and the airbag by which it was inflated and deployed. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1. The side view of the deployment state of an airbag. The side view of the sheet | seat provided with the airbag which shows the modification of this invention. The side view of the airbag which shows the modification of this invention. The side view of the airbag which shows the modification of this invention. The side view of the airbag which shows the modification of this invention. The side view of the airbag which shows the modification of this invention. The side view of the airbag which shows the modification of this invention. The side view of the airbag which shows the modification of this invention. The top view of the expansion | deployment state of the side airbag apparatus with which the backrest part of the conventional seat was mounted | worn.

Explanation of symbols

  B ... Main gas flow direction, P ... Crew, Pe ... Elbow part, 12 ... Seat, 14 ... Seating part, 15 ... Backrest part, 17 ... Side airbag device, 18 ... Air bag, 18a, 18b ... Base cloth, 19 ... Inflator, 19a ... Gas injection nozzle, 21, 24 ... Sewing thread, 22 ... Thickness restriction part, 22A ... Upper thickness restriction part, 22B ... Lower thickness restriction part, 23 ... Reinforcement cloth, 27 ... Narrow expansion part, 29 …aisle.

Claims (5)

An airbag that inflates and expands between a side wall of the vehicle body and a passenger seated in a seat disposed in the interior of the vehicle body when an impact greater than a predetermined level is applied to the vehicle body, and the airbag is inflated A gas generation source for deployment, and the air bag is provided at a side edge of the seat back on the vehicle outer side, and is a space between the side wall of the body and the occupant toward the front in the traveling direction of the vehicle In the side airbag device that is configured to inflate and deploy, and protects at least the waist and chest of the occupant's waist, chest, shoulder, and head ,
In the state where the airbag is inflated and deployed by gas, a thickness regulating portion is provided for regulating the thickness dimension of the airbag at a position corresponding to the elbow portion of the occupant's arm to be smaller than other portions. , An inflatable portion by gas is formed around the entire thickness regulating portion ,
In the deployed state of the airbag, a narrow inflating portion is provided forward and downward in the vehicle traveling direction with respect to the thickness regulating portion of the inflating portion, and a waist protection portion is disposed behind the thickness regulating portion in the vehicle traveling direction. Provided,
The narrow expansion portion is formed in an arc shape when viewed from the side, and the radial width thereof is the same width,
The shortest distance between the front end of the thickness restricting portion and the front end of the airbag is made shorter than the shortest distance between the rear end of the thickness restricting portion and the rear end of the airbag, and the narrow expansion is performed. A side airbag device characterized in that a thickness dimension of the portion is made smaller than a thickness dimension of the waist protection portion . 2. The side air according to claim 1, wherein the airbag is composed of a pair of base fabrics facing each other, and the thickness regulating portion is sewn with a sewing thread with a reinforcing fabric interposed between the two base fabrics. Bag device. The thickness regulating section is divided into a plurality, side air bag device according to claim 1 or 2 is formed a passage of gas between the thickness regulating unit. The side airbag device according to any one of claims 1 to 3 , wherein the thickness regulating portion is formed in a circular shape . The side airbag device according to any one of claims 1 to 4, wherein the thickness regulating portion is offset downward or upward from a main gas flow direction injected from a gas injection nozzle of an inflator .

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