JP6709148B2 - Airbag - Google Patents

Description

TECHNICAL FIELD The present invention relates to an airbag that is inflated and deployed by gas supplied from an inflator.

BACKGROUND ART Conventionally, for example, an airbag device for a passenger in a passenger seat provided in an installed portion such as an instrument panel portion of an automobile is known. This airbag device includes an inflator that supplies gas and an airbag that has a bag-shaped airbag main body that is folded into a predetermined shape. In the event of a vehicle collision or the like, gas is supplied from the inflator to inflate and deploy the airbag main body in front of the occupant seated in the passenger seat to reduce the impact on the occupant.

In such an airbag, in recent years, in addition to a head-on collision, restraint performance of an occupant in an oblique collision (oblique collision) in which a part of a vehicle collides with an obstacle from an oblique direction is required. For example, when the second air chamber portion is connected to the side portion of the first air chamber portion that extends to the front of the occupant, and the occupant restraining surface portion at the rear end of the first air chamber portion collides with the occupant, It is known that the rear end portion of the second air chamber portion extends to the side of the occupant's occipital region to suppress head rotation of the occupant during an oblique collision (see, for example, Patent Document 1).

International Publication No. 2015/156088 (pages 6-10, Fig. 1-13)

In the case of the above configuration, the gas from the inflator is supplied only to the first air chamber portion at the initial stage of deployment of the airbag, so that the occupant approaches the airbag body portion, for example, in an unsteady sitting state (so-called A function of bypassing the inflation force from the first air chamber portion to the second air chamber portion when restraining the occupant while the first air chamber portion is inflating and expanding, such as in an out-of-position (OOP) state. There is no. Therefore, in order to prevent the occupant from being completely pushed by the first air chamber part, for example, a plurality of inflators are used, and gas from one or a plurality of inflators is cut off according to the seating position of the occupant detected by the seating sensor. Additional control is required, resulting in a significant cost increase. In addition, during the initial behavior of deployment, the amount of gas discharged from the first air chamber portion is small, which increases the reaction force to the occupant. Therefore, a large number of vent holes are provided to reduce this reaction force. It is necessary to provide it, and gas cannot be used effectively.

Further, the second air chamber portion needs to be provided below the side portion of the first air chamber portion depending on the trajectory of the head of the occupant. In that case, the distance from the flow path for circulating the gas from the first air chamber portion to the second air chamber portion becomes longer, so that the expansion of the second air chamber portion is not delayed so that the inflator is not delayed. Therefore, it is necessary to take measures such as increasing the output of, and the cost will increase.

In this respect, although it is conceivable to extend the front end portion of the second air chamber portion to the vicinity of the front end portion of the first air chamber portion, in this case, as the second air chamber portion becomes larger, the entire airbag becomes larger. Upsizing.

The present invention has been made in view of the above point, and is a small-sized device that can quickly deploy the second air chamber portion while reducing the reaction force in the first air chamber portion in the initial stage of deployment. The purpose is to provide an airbag.

The airbag according to claim 1 is an airbag that is stored in a mounted state in front of a seat in a vehicle compartment in a folded state, and is inflated and deployed in front of an occupant by gas supplied from the inflator. Is supplied from the front end side and is arranged on the side part of the first air chamber part having a restraining surface part for restraining an occupant in the deployed state at the rear end part, and A communication port communicating with the first air chamber portion is provided, a front end portion is located rearward of a front end portion of the first air chamber portion, and a rear end portion is rearward of the restraint surface portion in a developed state. A second air chamber part extending in the direction of the first air chamber part and a side part of the first air chamber part arranged in front of the second air chamber part, and having a smaller capacity than the first and second air chamber parts. A receiving port that is located in front of the communication port and communicates with a front end of the first air chamber part to receive gas from the inflator; and a second communication port that communicates with the second air chamber part. And a third air chamber part having a flow port for circulating gas in the air chamber part.

According to a second aspect of the present invention, in the airbag according to the first aspect, the first and second air chamber portions are respectively provided with vent holes for discharging gas.

According to the airbag of claim 1, a third air chamber part having a receiving port communicating with the front end part of the first air chamber part and a circulation port communicating with the second air chamber part is provided. It is formed to have a smaller capacity than the first and second air chamber portions, and is arranged in front of the second air chamber portion at the side portion of the first air chamber portion, so that the third air chamber portion is provided. Gas can be rapidly introduced from the first air chamber to the second air chamber. Therefore, for example, when the occupant is positioned in front of the steady seated state, when the occupant comes into contact with the first air chamber in the initial stage of deployment, the gas in the first air chamber is discharged from the inlet. It can be discharged to the third air chamber part to reduce the reaction force in the first air chamber part at the initial stage of deployment, and at the same time, the gas can be made to flow into the second air chamber part through the flow port to make the second It is possible to quickly deploy the air chamber. In addition, the gas is allowed to flow into the second air chamber portion from the vicinity of the front end portion of the first air chamber portion by utilizing the inlet of the third air chamber portion without enlarging the second air chamber portion. Therefore, the second air chamber can be downsized, and the entire airbag can be downsized.

According to the airbag of claim 2, in addition to the effect of the airbag of claim 1, the first and second air chambers are provided with vent holes to appropriately discharge the gas inside. The internal pressure can be adjusted, and the occupant can be reliably restrained with an appropriate reaction force.

1 is a perspective view showing an airbag according to an embodiment of the present invention. FIG. 3 is a plan view showing the initial state of deployment of the airbag. FIG. 3 is a side view showing the initial state of the airbag deployment. FIG. 3 is a plan view showing a deployed state when the protected object of the airbag is in a steady sitting state. FIG. 4 is a side view showing a deployed state when the protected object of the airbag is in a steady sitting state. FIG. 4 is a plan view showing a deployed state when the protected object of the airbag is in the unsteady sitting state. FIG. 4 is a side view showing a deployed state when the protected object of the airbag is in an unsteady seated state. It is a top view which shows typically the vehicle provided with the same airbag.

The configuration of one embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

In FIG. 8, reference numeral 10 denotes an airbag device, which is installed in front of an occupant A who is a protected object seated on a seat S in a passenger compartment of an automobile 11 as a vehicle. It is arranged inside the portion 14. In the present embodiment, the airbag device 10 will be described, for example, for a passenger seat. In the following description, the front-rear direction, both side directions, and the up-down direction will be described with reference to the straight traveling direction of the automobile 11 with the airbag device 10 attached to the automobile 11. Further, the airbag device 10 is described as a left-hand drive (LHD) specification having a handle (steering wheel) H in front of the left front seat, for example, but a right-hand drive specification can be handled by reversing the left and right. Further, in FIG. 4 and the like, the occupant A is shown as a dummy.

Further, the installed portion 14 is an instrument panel portion in the present embodiment, and as shown in FIG. 3 and the like, the installed portion 14 has a curved surface shape that slightly descends toward the rear side, that is, the passenger seat side. The airbag device 10 is fixed to a steering member (not shown), which is formed on the inside and is a member to be mounted, with the front side slightly inclined from the upper side toward the rear side, that is, the occupant A side by screwing or the like. Has been done. A windshield 15, which is a windshield inclined from the lower front side to the upper rear side, is arranged above the installed portion 14.

The airbag device 10 can also be referred to as an airbag module, and includes an airbag 21 formed of a base cloth, an inflator 22 that supplies gas to the airbag 21, and the airbag 21 and the inflator 22. A case body 23 to be attached, a retainer plate, a cover body that covers the airbag 21 before deployment, a control unit that controls the operation of the inflator 22, and the like are provided.

The case body 23 is formed in a substantially box shape, and the front side or the upper side facing the windshield 15 is a rectangular projecting opening which is an opening, and the inside is an airbag storing section for storing the folded airbag 21. ing. Then, this protruding port is normally covered with a cover body.

In the inflator 22, the igniter and the medicine are housed inside, and the electric signal from the control means transmitted through the connected connector causes the igniter to burn the medicine and rapidly supply the gas from the gas injection port. Known ones are used. In the present embodiment, the inflator 22 has a columnar shape attached to the case body 23, but various types such as a discoid shape can be used.

Further, the cover body is formed of resin integrally with or separately from the installed portion 14 (instrument panel portion), and has a tear line which is thinner than other portions and easily broken.

The airbag 21 shown in FIGS. 1 to 8 is formed by combining one or a plurality of base fabrics. The airbag 21 is formed in a bag shape. Further, the airbag 21 includes a first air chamber portion 31, a second air chamber portion 32, and a third air chamber portion 33.

The first air chamber portion 31 is a portion that mainly restrains the occupant A from the front. The first air chamber portion 31 includes a gas introduction portion 35, which is an inflator mounting port, at a front end portion which is a base end portion. Further, the first air chamber portion 31 is provided with a restraining surface portion 36 for restraining the occupant A at the time of deployment at a rear end portion which is a front end portion. Further, the first air chamber portion 31 is formed in a bag shape from the front end portion to the rear end portion, the width dimension of which is substantially constant and the thickness dimension of which is enlarged. The first air chamber portion 31 has a larger capacity than the second and third air chamber portions 32 and 33 and is a large-capacity airbag portion having the largest capacity in the airbag 21. In addition to the restraining surface portion 36, the first air chamber portion 31 faces the (first) upper surface portion 41 that faces the lower portion of the windshield 15 and the upper portion of the installed portion 14 (the first air chamber portion 31) (first portion). The lower surface portion 42 and the (first) side surface portions 43, 43 located on both sides of the lower surface portion 42. That is, in the first air chamber portion 31, the upper surface portion 41 and the lower surface portion 42 are continuous at the front end portion, the upper surface portion 41 is continuous at the upper portion of the constraining surface portion 36, and the lower surface portion 42 is at the lower portion of the constraining surface portion 36. While being continuous, the side surface portions 43, 43 are continuous on both sides of the constraining surface portion 36, the upper surface portion 41, and the lower surface portion 42. Further, the first air chamber portion 31 is provided with a (first) vent hole 45 which is a (first) exhaust port.

The gas introduction part 35 is located at the foremost part of the first air chamber part 31. For example, a third air chamber portion 33 is located beside the gas introduction portion 35. The periphery of the gas introducing portion 35 is fixed to the case body 23 via a retainer plate.

The restraint surface portion 36 mainly restrains the occupant A thrown forward. The restraint surface portion 36 is formed to extend vertically and horizontally so as to face the head A1 of the occupant A, the chest, the abdomen, and the like in the deployed state of the airbag 21 (first air chamber portion 31).

One side surface portion 43 (the left side surface portion 43 in the present embodiment) is a partition wall that partitions the first air chamber portion 31 and the second and third air chamber portions 32, 33.

The vent hole 45 is for adjusting the internal pressure of the first air chamber part 31 by discharging the gas supplied into the first air chamber part 31 to the outside of the airbag 21. The vent holes 45 are opened, for example, in a circular hole shape on both side surface portions 43. Further, the vent hole 45 is arranged at a position near the rear end portion of the side surface portions 43.

The second air chamber portion 32 is a portion mainly restraining the head A1 of the occupant A from the side. That is, the second air chamber portion 32 is located on the side of the first air chamber portion 31. Specifically, the second air chamber portion 32 has a seat S (the present embodiment) on which the occupant A restrained by the first air chamber portion 31 is seated with respect to the first air chamber portion 31. Is located on the seat S side (the left side, which is the driver's seat side in the present embodiment), which is the side opposite to the passenger seat). The second air chamber portion 32 is a medium-capacity airbag portion having a smaller capacity than the first air chamber portion 31 and a larger capacity than the third air chamber portion 33. The front end side of the second air chamber portion 32 is continuous with the rear portion of the third air chamber portion 33 and is located rearward of the inflator 22 (gas introduction portion 35). Further, the second air chamber portion 32 includes a (first) side restraint surface portion 51 that restrains the head A1 of the occupant A on the side portion of the rear end portion in the deployed state. The second air chamber portion 32 is formed in a bag shape extending from the front end portion to the rear end portion in a longitudinal shape with substantially constant width and vertical dimensions. That is, in the second air chamber portion 32, the front end portion is located rearward of the front end portion of the first air chamber portion 31, and the rear end portion of the second air chamber portion 32 extends rearward of the restraining surface portion 36 in the expanded state. Has been formed. The second air chamber portion 32 is formed so as to incline from the lower end to the upper end from the front end portion toward the rear end portion in the expanded state. Further, in addition to the side restraint surface portion 51, the second air chamber portion 32 includes a (second) upper surface portion 53, a (second) lower surface portion 54, a front surface portion 55, a rear surface portion 56, and a (second) The side restraint surface portion 57 is provided. That is, in the second air chamber portion 32, the upper surface portion 53 and the lower surface portion 54 are continuous above and below the front surface portion 55 at the front end portion, and the upper surface portion 53 and the lower surface portion 54 above and below the rear surface portion 56 at the rear end portion. And the first air chamber portion 31 side (the right side in the present embodiment) of the front surface portion 55 and the front end sides of the upper surface portion 53 and the lower surface portion 54 respectively. One side surface portion 43 (the left side surface portion 43 in the present embodiment) is continuous, and the rear surface portion 56 and the rear end side of each of the upper surface portion 53 and the lower surface portion 54 on the side of the first air chamber portion 31 ( The side restraint surface portion 51 is continuous to the right side in the present embodiment, and the side opposite to the first air chamber portion 31 of the front surface portion 55, the rear surface portion 56, the upper surface portion 53 and the lower surface portion 54 (in the present embodiment). The side restraint surface portion 57 is continuous to the left side). In addition, the second air chamber portion 32 includes a communication port 58 that communicates with the first air chamber portion 31. Further, the second air chamber portion 32 is provided with a (second) vent hole 59 which is a (second) exhaust port.

The side restraint surface portion 51 restrains the head A1 of the occupant A (passenger A in the front passenger seat) that is mainly thrown out laterally, for example, in an oblique collision. The side restraint surface portion 51 is continuous with one side surface portion 43 (the left side surface portion 43 in the present embodiment) of the first air chamber portion 31 and extends rearward with respect to the side surface portion 43. .. The side restraint surface portion 51 is branched from the side surface portion 43 at a position behind the communication port 58. Further, the side restraint surface portion 51 projects rearward from the restraint surface portion 36 of the first air chamber portion 31 in the expanded state and is deployed on the side portion of the head A1 of the occupant A.

The side restraint surface portion 57 restrains the head A1 of the occupant A (the occupant A in the driver's seat) mainly thrown out in the lateral direction at the time of, for example, an oblique collision.

The communication port 58 transfers a part of the gas in the first air chamber part 31 to the second air chamber part 32 in a state where the first air chamber part 31 is expanded more than a predetermined amount (after the middle stage of expansion). It is to be introduced. That is, the communication port 58 is an indirect introduction port into which a part of the gas that has expanded the first air chamber portion 31 is introduced. The communication port 58 has, for example, a circular hole shape on one side surface portion 43 (a left side surface portion 43 in the present embodiment) which is a partition wall between the first air chamber portion 31 and the second air chamber portion 32. It is open to. Therefore, the communication port 58 is opened along the left-right direction intersecting (orthogonal to) the front-rear direction which is the deploying direction of the airbag 21 (first air chamber portion 31). The communication port 58 is arranged on the rear end side of the first air chamber portion 31. Further, the communication port 58 is located in front of the vent hole 45 of the first air chamber portion 31. In the present embodiment, this communication port 58 is located below the vent hole 45 of the first air chamber portion 31.

The vent hole 59 is for adjusting the internal pressure of the second air chamber portion 32 by discharging the gas supplied into the second air chamber portion 32 to the outside of the airbag 21. The vent hole 59 is opened in the side restraint surface portion 57 in a circular hole shape. The vent hole 59 is arranged, for example, at a position closer to the front end of the second air chamber portion 32 (side restraint surface portion 57). The vent hole 59 is located in front of the vent hole 45 and the communication port 58 of the first air chamber portion 31. The vent hole 59 is located below the third air chamber portion 33.

The third air chamber portion 33 connects the first air chamber portion 31 and the second air chamber portion 32. The third air chamber portion 33 is located on the side of the first air chamber portion 31. The third air chamber portion 33 is located on the same side as the second air chamber portion 32 with respect to the first air chamber portion 31. The third air chamber portion 33 has a smaller capacity than the first and second air chamber portions 31 and 33 and is a small-capacity airbag portion having the smallest capacity in the airbag 21. Further, the front end portion of the third air chamber portion 33 is located at the front end portion of the first air chamber portion 31, that is, the side portion of the inflator 22 (gas introduction portion 35). Further, the rear end portion of the third air chamber portion 33 is continuous with the second air chamber portion 32. The third air chamber portion 33 is formed in a bag shape extending from the front end portion to the rear end portion in a longitudinal shape with substantially constant width and vertical dimensions. Further, the third air chamber portion 33 is formed so as to incline from the front end portion to the rear end portion from the upper side to the lower side in the expanded state. Therefore, the third air chamber portion 33 extends along a direction intersecting with the second air chamber portion 32. Further, the third air chamber portion 33 includes a (third) upper surface portion 61, a (third) lower surface portion 62, a front side surface portion 63 and a (third) side surface portion 64. That is, in the third air chamber portion 33, the upper surface portion 61 and the lower surface portion 62 are continuous above and below the front side surface portion 63 at the front end portion, and the upper surface portion 61 and the lower surface portion 62 are respectively formed at the rear end portion by the second upper surface portion 61 and the lower surface portion 62. Is continuous with the upper surface portion 53 of the air chamber portion 32, and the first air chamber portion 31 side (the right side in the present embodiment) of the upper surface portion 61, the lower surface portion 62 and the front side surface portion 63 is the first air chamber portion 31. One side surface portion 43 (in the present embodiment, the left side surface portion 43) is continuous with the upper surface portion 61, the lower surface portion 62, and the front side surface portion 63 on the opposite side of the first air chamber portion 31 (in the present embodiment. The side surface portion 64 is continuous to the left side in the embodiment. In addition, the third air chamber portion 33 includes a receiving port 66 that communicates with the first air chamber portion 31. Further, the third air chamber part 33 is provided with a flow port 67 communicating with the second air chamber part 32.

The receiving port 66 is located in front of the communication port 58 and communicates with the front end portion of the first air chamber portion 31 to receive gas from the inflator 22. Further, this receiving port 66 introduces a part of the gas supplied into the first air chamber part 31 into the third air chamber part 33 in the initial state of expansion of the first air chamber part 31. To do. That is, the receiving port 66 is a direct introduction port into which a part of the gas that does not substantially contribute to the development of the first air chamber part 31 protruding from the installation portion 14 is directly introduced. In other words, the receiving port 66 bypasses the gas in the first air chamber part 31 in the initial stage of deployment to the third air chamber part 33. The inlet 66 is formed, for example, in a circular hole shape on one side surface portion 43 (a left side surface portion 43 in the present embodiment) which is a partition wall between the first air chamber portion 31 and the third air chamber portion 33. It is open to. Therefore, the inlet 66 is opened along the left-right direction that intersects (orthogonally) with the front-rear direction, which is the deployment direction of the airbag 21 (third air chamber portion 33). The receiving port 66 is arranged near the front end of the third air chamber 33. Further, the receiving port 66 is arranged at the front end portion of the first air chamber portion 31 so as to face the side portion of the inflator 22 (gas introducing portion 35). Therefore, the receiving port 66 is arranged near the inflator 22. The receiving port 66 is located in front of the flow port 67 and the vent hole 59 of the second air chamber portion 32. In the present embodiment, the receiving port 66 is located above the communication port 58, the flow port 67, and the vent holes 45 and 59.

The circulation port 67 communicates with the second air chamber part 32 and circulates the gas supplied into the third air chamber part 33 to the second air chamber part 32. The circulation port 67 is opened in, for example, a circular hole in the upper surface portion 53 which is a partition wall portion between the third air chamber portion 33 and the second air chamber portion 32. Therefore, the circulation port 67 is opened at the rear end portion of the third air chamber portion 33. Further, the circulation port 67 is opened along a substantially vertical direction which is a direction intersecting (orthogonal to) the communication port 58 and the receiving port 66. Further, the circulation port 67 is located in front of the communication port 58. In the present embodiment, this circulation port 67 is located behind the vent hole 59 of the second air chamber portion 32. Further, the circulation port 67 is located at the same vertical position as the circulation port 67 or above the circulation port 67. In the present embodiment, this circulation port 67 is located below the vent hole 45 of the first air chamber portion 31.

Then, the airbag 21 is folded into a predetermined shape, the gas injection portion of the inflator 22 is inserted into the gas introduction portion 35, the periphery of the gas introduction portion 35 is held by a retainer plate, and the case body 23 of the case body 23 is held. It is stored inside the case body 23 while being pressed against the bottom. Then, the airbag 21, the case body 23, and the inflator 22 are integrally fixed via the retainer plate.

In the airbag device 10 configured as described above, the control device actuates the inflator 22 and injects gas from the inflator 22 in the event of a vehicle collision or the like. Then, the airbag 21 inflates and deploys with the inflow of gas from the gas introducing portion 35, breaks the tear line of the cover body, and projects from the projecting opening to the front side.

More specifically, as shown in FIGS. 2 and 3, in the initial stage of deployment, the gas introduced from the gas introducing portion 35 causes the first air chamber portion 31 to expand and project from the projecting port, and at the same time A part is bypassed from the receiving port 66 to the third air chamber part 33, and the gas is circulated from the third air chamber part 33 to the second air chamber part 32 through the flow port 67. The second air chamber portion 32 is inflated separately from the first air chamber portion 31. That is, before the middle stage of the deployment process of the airbag 21 or later, the gas is sent from the immediate vicinity of the inflator 22 to the second air chamber part 32 through the third air chamber part 33, so that the second air chamber 32 is discharged. A state in which the chamber portion 32 is preliminarily expanded, that is, the state where the base fabrics of the second air chamber portion 32 are in close contact with each other is eliminated, and gas can flow into the second air chamber portion 32 more quickly. As a result, it promotes the occurrence of the initial expansion movement of the second air chamber portion 32.

When the occupant A is in the normal seated state in which the occupant A is seated in the normal position, the first air chamber portion 31 is inflated and expanded further rearward by the gas, as shown in FIGS. When it is deployed to the position of the communication port 58, part of the gas is further bypassed from this communication port 58 to the second air chamber part 32, and at the end of the deployment, the restraint surface part 36 faces the front part of the occupant A. Deploy vertically and horizontally. Therefore, the occupant A thrown forward is reliably restrained by the restraint surface portion 36, for example, at the time of a frontal collision. The second air chamber part 32 is inflated and expanded rearward by the gas flowing from the receiving port 66 of the third air chamber part 33 through the circulation port 67 in the initial stage of expansion, and then flows in from the communication port 58 in the middle stage of expansion. The deployment gas is further accelerated rearward by the gas, and the rear end portion extends rearward with respect to the restraint surface portion 36 so as to deploy the side restraint surface portion 51 to the side of the head A1 of the occupant A in the latter half of the deployment. To do. Therefore, for example, at the time of an oblique collision (oblique collision), mainly the head A1 of the occupant A (in the present embodiment, the occupant A in the passenger seat) thrown in the lateral direction (center console, etc.) is restrained laterally. While restraining by the surface portion 51, mainly the head A1 of the occupant A (in the present embodiment, the occupant A in the driver's seat) thrown out in the lateral direction (center console etc.) is restrained by the side restraining surface portion 57, The rotation of these heads A1 is suppressed. Then, in the first and second air chamber portions 31, 32, the gas is exhausted from the vent holes 45, 59 to the outside by the contact with the occupant A, the internal pressure is appropriately adjusted, and the occupant is appropriately reacted. Protect A.

On the other hand, when the occupant A is in an unsteady sitting state (OOP state) in which the occupant A is located at an irregular position, for example, in front of the normal sitting position, as shown in FIG. 6 and FIG. The chamber 31 comes into contact with the occupant A before the chamber 31 is further inflated and deployed further by the gas. At this time, although the communication port 58 is not opened depending on the position of the occupant A, the gas in the first air chamber portion 31 is bypassed from the inlet 66 to the third air chamber portion 33, so that the internal pressure is appropriate. And restrain the occupant A with an appropriate reaction force. Further, regardless of whether the communication port 58 is opened, the second air chamber part 32 is moved backward by the gas flowing from the receiving port 66 of the third air chamber part 33 through the circulation port 67. The second air chamber portion 32 is inflated and deployed, and the second air chamber portion 32 extends rearward from the rear end portion of the first air chamber portion 31 that restrains the occupant A. Therefore, for example, at the time of an oblique collision (oblique collision), mainly the head A1 of the occupant A (in the present embodiment, the occupant A in the passenger seat) thrown in the lateral direction (center console, etc.) is restrained laterally. While restraining by the surface portion 51, the side restraining surface portion 57 restrains mainly the head A1 of the occupant A (in this embodiment, the occupant A in the driver's seat) thrown out in the lateral direction (center console or the like), The rotation of these heads A1 is suppressed.

As described above, according to the above-described embodiment, the first air chamber portion 31 is provided with the receiving port 66 communicating with the front end portion and the second air chamber portion 32 communicating with the circulation port 67. The third air chamber portion 33 is formed to have a smaller capacity than the first and second air chamber portions 31 and 32, and is provided at the side of the first air chamber portion 31 in front of the second air chamber portion 32. By arranging the gas, the gas can be rapidly introduced from the first air chamber portion 31 to the second air chamber portion 32 through the third air chamber portion 33 at the initial stage of expansion. For example, when the occupant A is in the unsteady seated state in which the occupant A is positioned in front of the steady seated state, when the occupant A contacts the first air chamber portion 31 at the initial stage of deployment, for example, the first air chamber In the conventional configuration in which the first portion and the second air chamber portion are communicated with each other after the center position of the first air chamber portion in the front-rear direction, gas cannot be discharged from the first air chamber portion, and the reaction force is high. In addition, in order to discharge the gas, it is necessary to provide a large number of vent holes and the like, whereas in the present embodiment, the gas in the first air chamber portion 31 is discharged from the receiving port 66 to the third port. Since it is discharged to the air chamber portion 33, the reaction force in the first air chamber portion 31 at the initial stage of deployment can be reduced. Moreover, the gas discharged from the first air chamber portion 31 via the receiving port 66 can flow into the second air chamber portion 32 via the circulation port 67, and the gas can be effectively used to generate the second gas. It is possible to quickly deploy the air chamber part 32.

In addition, the gas can be supplied from the vicinity of the front end portion of the first air chamber portion 31 to the second air chamber portion 32 by utilizing the inlet 66 of the third air chamber portion 33 without enlarging the second air chamber portion 32. Since the second air chamber 32 can be made smaller, the entire airbag 21 can be made smaller.

Furthermore, by providing the vent holes 45 and 59 in the first and second air chamber portions 31 and 32, it is possible to appropriately discharge the gas inside each and adjust the internal pressure, and to secure the occupant A with an appropriate reaction force. Can be bound to.

Further, by providing the third air chamber part 33, the second air chamber part 32 can be deployed at an early stage regardless of the position of the second air chamber part 32, and the flexibility of the layout of the airbag 21 can be increased. Is improved.

In the above-described embodiment, the airbag device 10 does not use the installed portion 14 as the instrument panel portion for the passenger seat, but instead uses the installed portion 14 as the central pad of the steering wheel H that does not rotate, for example, in the driver's seat. It can also be used for Further, for example, in the case of installing for the seats in the second and subsequent rows, for example, the seat back of the front seat, the rear part of the line console, and the like can be set as the installed part.

Further, the disposition of the inflator 22 is not specified, and for example, the inflator 22 may be directly connected to the airbag 21, or the gas may be supplied from a position distant from the airbag 21 by using a pipe or the like.

Further, although the third air chamber portion 33 is provided with the circulation port 67 on the upper surface portion 53 so as to communicate with the second air chamber portion 32, the entire rear end portion of the third air chamber portion 33 is circulated. It may be opened as the mouth 67. That is, the rear end portion of the third air chamber portion 33 may not have the partition wall portion with respect to the second air chamber portion 32.

INDUSTRIAL APPLICABILITY The present invention can be suitably used as an airbag of an airbag device for a passenger seat or a driver seat, for example.

14 Installed part
21 airbag
22 inflator
31 First air chamber
32 Second air chamber
33 Third air chamber
36 Restraint surface
45, 59 vent hole
58 Communication port
66 entrance
67 Distribution port A Crew S Seat

Claims (2)

An airbag that is accommodated in a folded state in a front portion of a seat in a vehicle compartment and inflates and deploys in front of an occupant by gas supplied from an inflator,
Gas from the inflator is supplied from the front end portion side, and a first air chamber portion having a rear end portion with a restraint surface portion for restraining an occupant in an expanded state,
The first air chamber portion is disposed on a side portion, and a communication port that communicates with the first air chamber portion is provided, and a front end portion is located rearward of a front end portion of the first air chamber portion, And, a second air chamber portion whose rear end portion extends rearward from the restraint surface portion in a deployed state,
It is arranged on the side of the first air chamber part in front of the second air chamber part, has a smaller capacity than the first and second air chamber parts, and is located in front of the communication port. A receiving port that communicates with the front end of the first air chamber part and receives gas from the inflator, and a flow port that communicates with the second air chamber part and distributes gas to the second air chamber part. And a third air chamber part having a. The airbag according to claim 1, wherein each of the first and second air chamber portions is provided with a vent hole for discharging gas.

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