JP4591190B2 - Airbag device for driver's seat - Google Patents

Description

  The present invention relates to an airbag device for a driver's seat.

  As an airbag device for a driver's seat, there is one in which an inner bag is provided inside an outer bag (see, for example, Patent Document 1).

  In the driver airbag device, gas is supplied to the inner bag and gas is supplied to the outer bag from the outlet of the inner bag, so that the inner bag and the outer bag are inflated.

However, in this airbag apparatus for a driver's seat, the outflow port is disposed on the occupant side of the steering wheel surface (rim surface). For this reason, there is a possibility that the outer bag does not rapidly inflate toward the steering wheel rim in the initial stage of inflation, and that a quick support reaction force via the tearing wheel rim cannot be ensured when the occupant hits the outer bag.
JP 2001-80440 A

  An object of the present invention is to obtain a driver-seat airbag apparatus that can secure a sufficient reaction force of an airbag via a steering wheel rim in consideration of the above facts.

A driver's seat airbag device according to claim 1 is provided with a peripheral airbag provided in a peripheral portion of a driver's seat airbag, a central portion of the airbag, and a steering wheel when deployed. A central airbag for supplying gas to the peripheral airbag through the plurality of communication holes by forming a plurality of communication holes arranged on the occupant side and the non-occupant side with respect to the rim of the rim. And the communication hole on the occupant side with respect to the rim when the central airbag is deployed is directed in a direction toward the occupant side surface of the rim, and the communication hole on the side opposite to the occupant is with respect to the rim. It is directed to the direction toward the surface of the counter-occupant side of the rim, and the peripheral airbag against the occupant side portion and the counter-occupant side portion of the rim is expanded by being supplied with gas To.

A driver's seat airbag device according to claim 2 is the driver seat airbag device according to claim 1 , wherein a pair of inclined portions are provided in the central airbag, and one of the airbags is deployed when the central airbag is deployed. The inclined portion is disposed on the occupant side with respect to the plane on which the central axis of the rim is disposed, and is inclined toward the rim side as it goes toward the occupant side, and the other inclined portion is anti-occupant with respect to the plane. It is arranged in such a way that it is inclined toward the rim side as it goes to the side opposite to the occupant, and the communication hole is formed in each of the pair of inclined portions.

The driver's seat airbag device according to claim 3 is the driver's seat airbag device according to claim 1 or 2 , wherein the peripheral airbag is disposed on the side opposite to the occupant with respect to the rim when deployed. A non-occupant-side deployment portion having a diameter larger than the inner peripheral diameter of the rim, and being disposed on the occupant side with respect to the rim when deployed, and having a diameter larger than the inner peripheral diameter of the rim, An occupant-side deployment portion that has a larger capacity than the side deployment portion, a small-diameter portion that is disposed between the anti-occupant-side deployment portion and the occupant-side deployment portion, and has a smaller diameter than the inner circumferential diameter of the rim; It is characterized by having.
The driver's seat airbag device according to claim 4 is the driver's seat airbag device according to any one of claims 1 to 3 , wherein the rim has a central axis disposed on a passenger side. The distance in the direction perpendicular to the plane of the center of the communication hole on the side opposite to the passenger from the plane is shorter than the distance in the direction perpendicular to the plane of the center of the communication hole.
The driver's seat airbag device according to claim 5 is the driver's seat airbag device according to any one of claims 1 to 4 , wherein the central airbag is connected to an upper portion of the peripheral airbag. The amount of gas supplied from the central airbag to the lower portion of the peripheral airbag is increased compared to the amount of gas supplied.
The driver's seat airbag device according to claim 6 is the driver's seat airbag device according to any one of claims 1 to 4 , wherein the driver seat airbag device includes the rim of the peripheral airbag from the central airbag. Further, the gas supply amount from the central airbag to the occupant side portion is larger than the rim of the peripheral airbag as compared with the gas supply amount to the non-occupant side portion.

  In the driver airbag apparatus according to the first aspect, the peripheral airbag is provided in the peripheral portion of the airbag, and the central airbag is provided in the central portion of the airbag. A plurality of communication holes are formed in the central airbag, and gas is supplied to the central airbag and gas is supplied to the peripheral airbags through the plurality of communication holes. Airbag) is deployed.

  Here, when the central airbag is deployed, a plurality of communication holes are respectively arranged on the occupant side and the non-occupant side with respect to the rim of the steering wheel. For this reason, the peripheral airbag can be rapidly deployed toward the rim at the initial stage of deployment, and a sufficient reaction force of the airbag via the rim can be ensured.

Further , the communication hole is directed toward the rim when the central airbag is deployed. For this reason, the peripheral airbag can surely be quickly deployed toward the rim at the initial stage of deployment, and a sufficient reaction force of the airbag via the rim can be ensured.

In the airbag device for a driver's seat according to claim 2 , the central airbag is provided with a pair of inclined portions, and when the central airbag is deployed, one inclined portion is on a plane on which the central axis of the rim is disposed. As opposed to being disposed on the occupant side and being inclined toward the rim side as it goes toward the occupant side, the other inclined portion is disposed on the anti-occupant side with respect to the plane, and is directed toward the rim side as it moves toward the anti-occupant side Is inclined to. Further, a communication hole is formed in each of the pair of inclined portions. For this reason, the communication hole can be easily directed toward the rim simply by providing the central airbag with the inclined portion and forming the communication hole in the inclined portion.

In the driver's seat airbag device according to claim 3 , the peripheral airbag has a non-occupant side deployment portion that is disposed on the side opposite to the occupant with respect to the rim during deployment, and an occupant that is disposed on the occupant side with respect to the rim during deployment. A side deployment portion, and a small-diameter portion disposed between the non-occupant deployment portion and the occupant deployment portion. The occupant-side deployment part has a larger capacity than the anti-occupant-side deployment part, and the peripheral airbag is deployed at the early stage of deployment, the occupant-side deployment part, the occupant-side deployment part, and the small-diameter part, and at the later stage of deployment. The side expansion part is further expanded.

  Here, the non-occupant side deployment portion and the occupant side deployment portion are made larger than the inner peripheral diameter of the rim, and the small diameter portion is made smaller than the inner peripheral diameter of the rim. For this reason, the peripheral airbag is positioned with respect to the rim at the initial stage of deployment, particularly when the rim is sandwiched between the anti-occupant-side deployment portion and the occupant-side deployment portion, thereby ensuring that the airbag is directed toward the occupant side. Can be deployed.

[First Embodiment]
FIG. 1 shows a cross-sectional view of a driver's seat airbag device 10 in the inflated and deployed state according to the first embodiment of the present invention as seen from the left side of the vehicle. FIG. The front driver airbag device 10 is shown in a cross-sectional view as seen from the left side of the vehicle. In the drawings, the front side of the vehicle is indicated by an arrow FR, and the upper side is indicated by an arrow UP.

  A driver's seat airbag device 10 according to the present embodiment is provided on a steering wheel 12. The steering wheel 12 is provided with a boss 14 at the center and an annular rim 16 at the periphery, and the rim 16 is connected to the boss 14 via a rod-like spoke 18. The boss 14 is fixed to the steering shaft 20 of the vehicle.

  The boss 14 is provided with a container-shaped accommodation portion 22. The bottom wall 22A, which is the vehicle front side wall of the accommodating portion 22, is fixed to the boss 14 by fastening bolts and nuts (not shown), and the peripheral wall of the accommodating portion 22 and the upper wall portion that is the rear side wall of the vehicle are broken walls 22B. Has been.

  An inflator 24 as a gas generating means is attached to the bottom wall 22A. The inflator 24 is connected to a control device (not shown), and the control device receives signals from an acceleration sensor and an obstacle detection sensor (not shown) to operate the inflator 24 and generate gas in the event of a vehicle emergency. Yes. The inflator 24 has a gas outlet 26 formed on the occupant side of the bottom wall 22A and discharges gas into the gas chamber A2 of the airbag 28 described below.

  The driver's seat airbag device 10 includes a fabric airbag 28 accommodated in the accommodating portion 22 in a folded state.

  The airbag 28 is arranged at the center of the steering wheel 12 and is arranged around the central airbag 30 and is inflated and deployed. The central airbag 30 is formed into a substantially cylindrical bag shape (outer diameter D1) when inflated and deployed. A peripheral airbag 32 that is sometimes annular around the central airbag 30.

  The peripheral airbag 32 includes an occupant-side cloth material 32A and a vehicle front-side cloth material 32B, and an annular gas chamber A1 is formed around the central airbag 30 when the airbag 28 is inflated and deployed. ing. The occupant side cloth material 32A and the vehicle front side cloth material 32B are each an annular cloth material, and the respective outer peripheral portions 32C and 32D are sewn together and connected. The inner peripheral portion 32E of the occupant side fabric material 32A is sewn and connected to the outer periphery of the end plate 30B described below of the center airbag 30. The vehicle front side cloth material 32B is sandwiched between a cylindrical portion 22C where the inner peripheral end portion 32F continues to the peripheral portion of the bottom wall 22A of the accommodating portion 22 and the peripheral wall of the fracture wall 22B. Thus, when the airbag 28 is inflated and deployed, the occupant side fabric material 32A and the vehicle front side fabric material 32B form an annular gas chamber A1 as a chamber around the cylindrical portion 30A of the central airbag 30. When the gas chamber A1 is formed, the vehicle front side fabric material 32B is longer in the axial direction of the cylindrical portion 30A than the passenger side fabric material 32A, and the intermediate portion in the axial direction is recessed by the inner periphery of the rim 16. The rim 16 is brought into contact with the passenger side portion and the non-passenger side portion.

  The center airbag 30 has a passenger-side end that is the vehicle rear side of the cylindrical portion 30A closed by an end plate 30B, and an anti-occupant-side end 30C that is the vehicle front side of the cylindrical portion 30A is the inner periphery of the peripheral airbag 32. The gas chamber A2 is fixed to the cylindrical portion 22C of the bottom wall 22A while being overlapped with the end portion 32F, and constitutes a gas chamber A2 that is a chamber inside. The outer periphery of the cylinder portion 22C is covered with the peripheral wall of the fracture wall 22B, and the peripheral wall of the fracture wall 22B is narrowed between the cylinder portion 22C and the inner peripheral end portion 32F of the vehicle front side cloth material 32B along with the non-occupant side end 30C. I have it.

  As shown also in FIG. 3, a constricted portion 34 is formed over the entire circumference in the axial direction intermediate portion of the cylindrical portion 30A, and a small diameter portion is formed in the axial direction intermediate portion of the cylindrical portion 30A. . The central portion in the axial direction of the constricted portion 34 is a minimum diameter portion 34A (outer diameter D2), and the inclined portion 34B and the inclined portion 34C in the occupant side portion and the counter occupant side portion of the minimum diameter portion 34A have an outer diameter D1. The outer diameter gradually becomes smaller from the outer diameter D2 to the outer diameter D2. When the central airbag 30 is inflated and deployed, the inclined portion 34B is inclined in a direction approaching the rim 16 side toward the occupant side, and the inclined portion 34C is inclined in a direction approaching the rim 16 side as it goes toward the non-occupant side. .

  A plurality of communication holes 36 (that is, a group of communication holes 36 or a row of communication holes 36) and a plurality of communication holes 38 (that is, a group of communication holes 38 or a row of communication holes 38) are formed through the inclined portion 34B and the inclined portion 34C, respectively. ing. The plurality of communication holes 36 and the plurality of communication holes 38 are each formed in this embodiment, and are arranged at equal intervals along the circumferential direction of the cylindrical portion 30A.

  As shown in FIG. 1, when the central airbag 30 is inflated and deployed, the plurality of communication holes 36 are disposed at a position closer to the passenger (in the direction of the arrow P) than the plane H on which the central axis of the rim 16 is disposed, and the central axis Is directed toward the rim 16 and directed in the direction toward the rim 16, and the plurality of communication holes 38 are arranged at positions on the side opposite to the occupant (in the direction of arrow F) with respect to the plane H and the central axis is directed toward the rim 16. And directed toward the rim 16. For this reason, the plurality of communication holes 36 and the plurality of communication holes 38 eject gas into the gas chamber A1 toward the rim 16 when gas is generated in the inflator 24.

  Further, when the central airbag 30 is inflated and deployed, the occupant side communication hole 36 has a distance E1 from the plane H (distance in the direction perpendicular to the plane H from the center plane H of the communication hole 36). The distance E2 of the communication hole 38 from the plane H (the distance in the direction perpendicular to the plane H from the center plane H of the communication hole 36) is shortened.

  Next, the operation of the present embodiment will be described.

  In the airbag apparatus 10 for a driver's seat having the above-described configuration, the gas is supplied to the central airbag 30 and the central airbag 30 is inflated and deployed when the inflator 24 generates gas at the time of vehicle collision (particularly frontal collision). In addition, the peripheral airbag 32 is inflated and deployed by supplying gas from the central airbag 30 to the peripheral airbag 32 through the plurality of communication holes 36 and 38. As a result, the breaking wall 22B of the housing portion 22 is broken, and the airbag 28 (that is, the central airbag 30 and the peripheral airbag 32) is inflated and deployed toward the occupant side of the rim 16, so that the airbag 28 to bound.

  Here, when the central airbag 30 is inflated and deployed, the plurality of communication holes 36 are disposed on the occupant side with respect to the rim 16 (that is, the plane H), and the plurality of communication holes 38 are disposed on the occupant side with respect to the rim 16. Therefore, the peripheral airbag 32 can be quickly inflated and deployed toward the rim 16 in the initial stage of inflation and deployment. For this reason, particularly when the peripheral airbag 32 is brought into contact with the occupant side portion of the rim 16 in the initial stage of inflation and deployment, the occupant side via the rim 16 (in the direction of the steering shaft 20) and A rapid support reaction force in a direction perpendicular to the occupant side (plane H direction) can be secured, and the occupant restraining performance of the airbag 28 can be enhanced. In addition, the peripheral airbag 32 is brought into contact with the occupant side portion of the rim 16 in the initial stage of inflation and deployment, so that the peripheral airbag 32 is quickly positioned with respect to the rim 16 and the airbag 28 is directed toward the occupant side. The airbag 28 can be reliably inflated, and a stable deployment performance of the airbag 28 can be obtained (the deployment behavior of the airbag 28 can be stabilized).

  Further, when the central airbag 30 is inflated and deployed, the plurality of communication holes 36 and the plurality of communication holes 38 are oriented in the direction toward the rim 16. For this reason, the peripheral airbag 32 can be surely inflated and deployed quickly toward the rim 16 at the initial stage of inflation and deployment, the occupant restraint performance of the airbag 28 can be reliably increased, and the deployment performance of the stable airbag 28 can be ensured. Can be definitely obtained.

  Further, when the central airbag 30 is inflated and deployed, the inclined portion 34B of the central airbag 30 is inclined toward the rim 16 side toward the occupant side, and the inclined portion 34C of the central airbag 30 is moved toward the non-occupant side. Inclined in the direction approaching the rim 16 as it goes, a plurality of communication holes 36 are formed in the inclined portion 34B, and a plurality of communication holes 38 are formed in the inclined portion 34C. Therefore, the central airbag 30 is provided with the inclined portions 34B and 22B, and the plurality of communication holes 36 and 38 are formed in the inclined portions 34B and 22B. The occupant restraint performance and deployment performance of the airbag 28 can be easily adjusted.

  Further, when the central airbag 30 is inflated and deployed, the distance E2 from the plane H of the communication hole 38 on the non-occupant side is made shorter than the distance E1 from the plane H of the communication hole 36 on the occupant side. Thus, the peripheral airbag 32 is inflated and deployed at an early stage on the side opposite to the occupant side of the rim 16 and brought into contact with the rim 16 as compared to the occupant side of the rim 16. Thus, the inflated and deployed posture can be stabilized at an early stage, and a more stable deployment performance of the airbag 28 can be obtained.

[Second Embodiment]
FIG. 4 is a cross-sectional view of the driver's seat airbag device 50 in the inflated and deployed state according to the second embodiment of the present invention as viewed from the left side of the vehicle.

  The driver airbag device 50 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  In the driver airbag device 50, the vehicle front side fabric material 32B of the peripheral airbag 32 includes a vehicle rear side fabric material 52A, a vehicle front side fabric material 52B, a vehicle rear side fabric material 52A, and a vehicle front side fabric material 52B. And the middle cloth material 52C. The vehicle rear side fabric material 52A, the vehicle front side fabric material 52B, and the middle side fabric material 52C are each formed into an annular fabric material. The vehicle rear side fabric material 52A and the middle side fabric material 52C have their inner peripheral portions 52F and 52G sewn together and connected to each other, and the vehicle front side fabric material 52B and the middle side fabric material 52C have their respective outer circumferences. The parts 52D and 52E are sewn together and connected.

  In the peripheral airbag 32, the occupant-side cloth material 32A and the vehicle rear-side cloth material 52A are made into the occupant-side deployed part 54A, and the vehicle front-side cloth material 52B and the middle-side cloth material 52C are made into the anti-occupant-side developed part 54B. The portion between the vehicle rear side fabric material 52A and the middle side fabric material 52C is a small diameter portion 54C as a constriction. When the peripheral airbag 32 is inflated and deployed, the non-occupant side deployment portion 54B has a maximum diameter A larger than the inner peripheral diameter R of the rim 16, and is disposed at a position on the side opposite to the occupant (in the direction of arrow F) from the plane H. The occupant-side deployment portion 54A has a maximum diameter B larger than the inner peripheral diameter R of the rim 16 and is disposed at a position closer to the occupant side (in the direction of the arrow P) than the plane H. The small-diameter portion 54C has a minimum diameter C. Is made smaller than the inner peripheral diameter R of the rim 16 and is disposed between the occupant-side deployment portion 54A and the non-occupant-side deployment portion 54B. Further, the occupant-side deployment portion 54A has a larger capacity than the non-occupant-side deployment portion 54B, and the vehicle rear-side fabric material 52A of the occupant-side deployment portion 54A and the middle-side fabric material 52C of the anti-occupant-side deployment portion 54B, respectively. The rim 16 contacts the occupant side portion of the rim 16 and the non-occupant side portion of the rim 16.

  Next, the operation of the present embodiment will be described.

  In the driver's seat airbag device 50 configured as described above, as in the first embodiment, the fracture wall 22B of the housing portion 22 is broken during a vehicle collision (particularly a frontal collision), and the airbag 28 ( In other words, the central airbag 30 and the peripheral airbag 32) are inflated and deployed on the occupant side of the rim 16, so that the airbag 28 restrains the occupant. In the peripheral airbag 32, the occupant-side deployment part 54A, the counter-occupant-side deployment part 54B, and the small-diameter part 54C are inflated in the initial stage of inflation and deployment, and the occupant-side deployment part 54A is further inflated in the later stage of inflation and deployment.

  Here, also in this embodiment, the same effect as that of the first embodiment can be obtained.

  Particularly, the peripheral airbag 32 is quickly positioned with respect to the rim 16 by sandwiching the rim 16 between the occupant-side deployment portion 54A and the anti-occupant-side deployment portion 54B in the initial stage of inflation and deployment. As a result, the occupant restraining performance of the airbag 28 can be further reliably increased, and the stable deployment performance of the airbag 28 can be more reliably obtained.

  In the first embodiment and the second embodiment, the communication holes 36 and 38 are respectively disposed on the occupant side and the counter occupant side with respect to the rim 16 when the central airbag 30 is inflated and deployed. However, the position of the communication hole at the time of inflating and deploying the central airbag may be anywhere, and the structure in which the communication hole is directed toward the rim at the time of inflating and deploying the central airbag, The communication holes may be configured to be directed toward the occupant side (particularly in the vicinity of the rim occupant side) and the counter occupant side (particularly in the vicinity of the rim counter occupant side) from the rim.

  Further, in the first embodiment and the second embodiment described above, the inclined portion 34B and the inclined portion 34C are provided on the occupant side portion and the counter occupant side portion of the minimum diameter portion 34A of the central airbag 30, respectively. However, the inclined portion 34B or the inclined portion 34C may be provided only in one of the occupant side portion and the counter occupant side portion of the minimum diameter portion 34A of the central airbag 30.

  In the first and second embodiments, the central airbag 30 is positioned at the center of the airbag 28 (peripheral airbag 32). However, the central airbag 30 is not necessarily provided. It does not have to be located at the center of the airbag 28 (peripheral airbag 32) (it may be offset from the center of the airbag 28). In particular, when the central airbag is offset downward from the central portion of the airbag, the peripheral airbag 32 can be effectively inflated and deployed in the lower portion of the rim 16, and the passenger ( In particular, the support reaction force of the occupant through the rim 16 can be more reliably ensured when hitting the chest (moving to the lower portion of the rim 16), and the occupant restraining performance of the airbag 28 can be further reliably increased.

  Furthermore, in the first embodiment and the second embodiment described above, the opening area of the lower communication holes 36, 38 is made larger than the opening area of the upper communication holes 36, 38, or the upper communication holes 36, 38 are increased. By increasing the number of lower communication holes 36, 38 compared to the number of holes 36, 38, etc., to the lower part of the peripheral airbag 32 compared to the amount of gas supplied to the upper part of the peripheral airbag 32 It is preferable to increase the gas supply amount. Accordingly, the peripheral airbag 32 can be effectively inflated and deployed on the lower portion of the rim 16, and the rim can be more reliably secured when hitting an occupant (particularly the chest moving to the lower portion of the rim 16). The support reaction force of the occupant through 16 can be ensured, and the occupant restraining performance of the airbag 28 can be more reliably increased.

  In the first embodiment and the second embodiment, the opening area 36 of the communication hole on the occupant side is made larger than the opening area of the communication hole 38 on the occupant side, or the communication on the anti-occupant side is made. The rim 16 of the peripheral airbag 32 is larger than the rim 16 of the peripheral airbag 32 than the rim 16 of the peripheral airbag 32 and the amount of gas supplied to the occupant-side portion is larger than the number of holes 38. It is preferable to increase the amount of gas supplied to the passenger side portion. As a result, the peripheral airbag 32 can effectively bite into the occupant side portion of the rim 16, and the occupant restraining performance of the airbag 28 can be further enhanced.

FIG. 2 is a cross-sectional view seen from the left side of the vehicle showing a state where the airbag of the driver's seat airbag device according to the first embodiment of the present invention is inflated and deployed. FIG. 3 is a cross-sectional view seen from the left side of the vehicle, showing a state before the airbag of the driver airbag apparatus according to the first embodiment of the present invention is inflated and deployed. It is the perspective view seen from the vehicle diagonal back which shows the state by which the center airbag was inflated and deployed in the airbag apparatus for driver's seats concerning the 1st Embodiment of this invention. It is sectional drawing seen from the vehicle left side which shows the state by which the airbag of the airbag apparatus for driver's seats concerning the 2nd Embodiment of this invention was inflate-deployed.

Explanation of symbols

10 Airbag device for driver's seat 12 Steering wheel 16 Rim
24 inflator 28 airbag 30 central airbag 32 peripheral airbag 34B inclined portion 34C inclined portion 36 occupant side communication hole 38 anti-occupant side communication hole 50 driver's seat airbag device 54A occupant side deployment portion 54B anti occupant side deployment portion 54C Small diameter part
E1 distance
E2 distance
H plane

Claims (6)

A peripheral airbag provided in a peripheral side portion of the airbag for the driver's seat;
A plurality of communication holes are formed on the occupant side and the non-occupant side with respect to the rim of the steering wheel when deployed, and the gas is supplied from the inflator so that the gas is supplied from the inflator. A central airbag for supplying gas to the peripheral airbag through a plurality of communication holes;
With
When the central airbag is deployed, the communication hole on the occupant side with respect to the rim is directed in a direction toward the occupant side surface of the rim, and the communication hole on the side opposite to the occupant is the anti-occupant of the rim. An airbag device for a driver's seat that is directed in a direction toward a side surface and that is deployed by supplying gas to contact a passenger side portion and a non-passenger side portion of the rim. The central airbag is provided with a pair of inclined portions, and when the central airbag is deployed, one of the inclined portions is disposed on the occupant side with respect to a plane on which the central axis of the rim is disposed, and as the occupant side moves, Inclined in a direction approaching the rim side, the other inclined portion is disposed on the side opposite to the occupant with respect to the plane, and is inclined in a direction approaching the rim side toward the opposite occupant side, and the pair of inclined portions 2. The driver seat airbag device according to claim 1 , wherein the communication hole is formed in each of the first and second communication holes . The peripheral airbag is
An unoccupied side deployment portion that is arranged on the side opposite to the rim during deployment and is made larger in diameter than the inner diameter of the rim;
An occupant-side deployment portion that is disposed on the occupant side with respect to the rim at the time of deployment, and has a larger diameter than the inner peripheral diameter of the rim and a larger capacity than the anti-occupant-side deployment portion;
A small-diameter portion that is disposed between the non-occupant-side deployment portion and the occupant-side deployment portion, and has a smaller diameter than the inner peripheral diameter of the rim;
The airbag device for a driver's seat according to claim 1 or 2, characterized by comprising : The direction perpendicular to the plane from the plane to the center of the communication hole on the side opposite to the occupant as compared to the distance in the direction perpendicular to the plane from the plane where the center axis of the rim is disposed to the center of the communication hole on the passenger side The airbag device for a driver's seat according to any one of claims 1 to 3, characterized in that the distance at is shortened . The gas supply amount from the central airbag to the lower portion of the peripheral airbag is increased as compared with the gas supply amount from the central airbag to the upper portion of the peripheral airbag. The driver's seat airbag device according to any one of claims 4 to 4. More gas is supplied from the central airbag to the occupant side portion than the rim of the peripheral airbag than to the rim of the peripheral airbag from the rim of the peripheral airbag. The airbag device for a driver's seat according to any one of claims 1 to 4 , wherein the airbag device is for a driver's seat.

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