JP2015024729A - Driver seat airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently restrain a head of an occupant on a driver seat, even when the head is inertially moved to the oblique front due to impact of a head-on collision.SOLUTION: In an airbag 16 of a driver seat airbag device 10, a gas introduction section 16B is extended from a part of an inner periphery of a body section 16A to be an annular bag body. The body section 16A is inflated and deployed to a driver seat side with respect to the gas introduction section 16B while being supported from an opposite side of the driver seat by a rim 12B of a steering wheel 12 by introducing gas from an inflator 14 into the inside through the gas introduction section 16B. The body section 16A can be reduced in volume as compared with a flat spherical bag body having the same outer diameter dimension because the body section 16 is the annular bag body. Therefore, time until inflation and deployment of the airbag 16 is completed can be shortened, internal pressure of the body section 16A can be increased, and reaction force that the airbag 16 receives from the rim 12b can be increased.

Description

  The present invention relates to a driver-seat airbag device that protects passengers in a driver's seat of a vehicle.

  An automobile occupant protection device described in Patent Document 1 below includes a central gas bag that expands in a gas mainstream direction from a gas generator, and an outer peripheral gas bag that is connected to the outer periphery of the central gas bag. . This outer peripheral gas bag communicates with the central gas bag through a flow port provided in a connection portion with the central gas bag, and expands and develops in a donut shape in the circumferential direction of the outer periphery of the central gas bag. Hold the rib part. As a result, even when the collision location of the head or chest of the occupant deviates from the center, the human body is surely received and the impact energy is absorbed and mitigated.

Japanese Patent Laid-Open No. 1-132444

  By the way, when the vehicle collides frontally with the colliding object (so-called oblique collision), or when a portion on the outer side in the vehicle width direction from the front side member of the vehicle collides with the colliding object such as an oncoming vehicle. In a so-called minute lap collision, the vehicle occupant moves inertially forward by an impact. At that time, if the passenger's head is displaced in a direction away from the steering wheel in the vehicle width direction and enters the driver's seat airbag, the driver's seat airbag cannot receive a sufficient reaction force from the steering wheel. There is a case.

  In consideration of the above-described facts, the present invention provides an airbag device for a driver's seat that can restrain the head satisfactorily even when the head of an occupant in the driver's seat inertially moves obliquely forward due to the impact of a frontal collision. With the goal.

  The airbag device for a driver's seat according to the invention described in claim 1 is provided on a steering wheel of a vehicle and generates a gas by being operated, and an inner periphery of a main body portion which is an annular bag body. A gas introduction part extends from a part, and the gas is introduced into the main body through the gas introduction part, so that the main body is supported from the opposite side of the driver's seat by the rim of the steering wheel. And an airbag that is inflated and deployed to the driver's seat side with respect to the gas introduction portion.

  In the first aspect of the present invention, for example, when the vehicle has an oblique collision or a minute lap collision, the gas generator is activated. Then, the gas generated from the gas generator is introduced into the main body portion through the gas introduction portion of the airbag. As a result, the main body is supported from the side opposite to the driver's seat by the rim of the steering wheel and is inflated and deployed to the driver's seat side rather than the gas introduction portion. However, the head can be restrained by the main body.

  Moreover, in this airbag, since the main body portion that is an annular bag body is inflated and deployed to the driver's seat side rather than the gas introduction portion on the inner peripheral side, a flat spherical bag body having an equivalent outer diameter dimension and In comparison, the volume can be reduced. As a result, it is possible to shorten the time until the airbag is inflated and deployed, and to increase the internal pressure, thereby increasing the reaction force that the airbag receives from the rim. As a result, the movement of the head can be effectively suppressed at the initial stage of restraint, and the head restraint performance can be improved.

  A driver's seat airbag device according to a second aspect of the present invention is the driver's seat airbag device according to the first aspect, wherein the airbag covers the main body and the gas introduction portion from the driver's seat side during the inflation and deployment. And a driver's seat side covering member.

  In the invention according to claim 2, even if the main body portion of the airbag is configured to have a small capacity by the annular bag body, the head restraint surface can be widely secured by the driver seat side covering member. As a result, the head restraint performance can be further improved.

  A driver's seat airbag apparatus according to a third aspect of the present invention is the driver seat airbag apparatus according to the first or second aspect, wherein at least the steering wheel is positioned on the center side of the steering angle and the airbag is inflated and deployed. The gas introduction part is provided so that the gas introduction part extends downward from the center part of the steering wheel and reaches the inner periphery of the main body part.

  In the third aspect of the present invention, when the gas generating device is operated in a state where the steering wheel is located at the center side of the steering angle, that is, in a state where the steering wheel is not largely steered, the gas from the gas generating device is moved into the gas introducing portion. Is introduced downward into the main body. Here, since there are many cases where the steering wheel is not steered greatly at the time of an oblique collision or a minute lap collision, the configuration as described above suppresses the influence of the airbag on an occupant located at an inappropriate position. Can do. That is, for example, even when the airbag is inflated and deployed with the occupant's head positioned above the steering wheel, the inflation pressure received by the head from the main body of the airbag can be reduced.

  The airbag device for a driver's seat according to the invention described in claim 4 is the air bag device for a driver seat according to any one of claims 1 to 3, wherein the main body includes a vent hole and a tension when the main body is inflated and deployed. And a closing member for closing the vent hole.

  In the invention according to claim 4, when the main body portion of the airbag is inflated and deployed, the closing member provided in the main body portion receives the tension from the main body portion and closes the vent hole. Thereby, since the internal pressure of the expansion | swelling initial stage of a main-body part can be raised, the head initial stage restraint performance of a main-body part can be improved. On the other hand, when the main body portion is crushed by a load from the head of the occupant, the tension applied to the closing member is reduced, and the vent hole is opened. As a result, the gas in the main body is exhausted from the vent hole. However, since the gas is exhausted after the main body is crushed as described above, the time for maintaining the internal pressure of the main body at a high pressure can be extended.

  A driver's seat airbag device according to a fifth aspect of the present invention is the driver's seat airbag device according to the fourth aspect, wherein the airbag is configured to cover the main body and the gas introduction portion from the driver's seat when the airbag is inflated and deployed. A driver's seat side covering member attached to the main body and the anti-driver's seat side covering member attached to the main body so as to cover the main body and the gas introduction portion from the side opposite to the driver's seat during the expansion and deployment. The vent hole and the closing member are provided on the inner periphery of the main body.

  In the invention according to claim 5, when the head of the occupant enters the inflated airbag, the vent hole provided in the inner periphery of the main body is released from the closing by the closing member, and the gas in the main body is vented. The air is exhausted to the inner peripheral side of the main body. Here, in the present invention, since the main body portion and the gas introduction portion of the airbag are covered from the driver seat side and the counter driver seat side by the driver seat side covering member and the counter driver seat side covering member, the air is exhausted from the vent hole. Gas can be prevented from being exhausted to the outside of the airbag. As a result, it is possible to further increase the time for maintaining the internal pressure of the airbag. Moreover, since it has a driver's seat side covering member like the invention of Claim 2, there exists an effect similar to the invention of Claim 2.

  The airbag device for a driver's seat according to a sixth aspect of the present invention is the air bag device according to any one of the first to fifth aspects, wherein a pair of base fabrics overlapped with each other sew an outer peripheral edge portion. In addition, the edge portions of the slits formed on the center side of the respective base fabrics are overlapped with each other and sewn to partition the main body portion and the gas introduction portion.

  In the invention according to claim 6, since the main body portion which is an annular bag body and the gas introduction portion extended from a part of the inner periphery of the main body portion can be manufactured by a pair of base fabrics. The configuration of the airbag can be simplified.

  As described above, in the driver's seat airbag device according to the present invention, even when the head of an occupant in the driver's seat inertially moves obliquely forward due to the impact of a frontal collision, the head can be restrained well. .

It is a figure which shows the state which the airbag of the driver's seat airbag apparatus which concerns on embodiment of this invention inflate-deployed in relation to a steering wheel, and expands and shows the cut surface along the F1-F1 line | wire of FIG. It is an expanded sectional view. It is the front view which looked at the inflation deployment state of the airbag from the driver's seat side. (A)-(D) are the plane expanded views of the four base fabrics which are the structural members of the airbag. It is sectional drawing which shows the planar deployment state of the airbag. (A) is a perspective view which shows a vent hole and the obstruction | occlusion cloth, (B) is sectional drawing which shows the cut surface along the FB-FB line of (A), (C) is FC- of (A). It is an expanded sectional view which expands and shows the cut surface along FC line. It is the top view which looked at the situation at the time of a passenger | crew's head displacing diagonally forward and rushing into the airbag which concerns on a comparative example from the vehicle upper side. It is the side view which looked at the state where a crew member is located in a non-regular position from the vehicle width direction.

  A driver's seat airbag device 10 according to an embodiment of the present invention will be described with reference to FIGS. It should be noted that arrows FR, UP, and OUT appropriately shown in the drawings respectively indicate the front direction (traveling direction), the upward direction, and the outside in the vehicle width direction of the vehicle. Hereinafter, when the description is made simply using the front-rear direction and the up-down direction, the front-rear direction of the vehicle and the up-down direction of the vehicle are indicated unless otherwise specified.

(Constitution)
As shown in FIG. 1, the driver airbag device 10 according to the present embodiment includes an inflator 14 (gas generator) disposed in the center of a steering wheel 12 and gas generated by the inflator 14. The airbag 16 that is inflated and deployed is configured as a main part. 1 and 2 show a state where the airbag 16 has been inflated and deployed.

The steering wheel 12 includes a hub 12A fixed to an upper end portion of a steering shaft (not shown), an annular rim 12B arranged concentrically with the hub 12A, a plurality of spokes 12C connecting the hub 12A and the rim 12B, It is constituted by. A metal base plate 18 is attached to the rear surface of the hub 12A (driver seat side surface not shown). A circular through hole 20 for inserting an inflator is formed at the center of the base plate 18.

The inflator 14 is formed in a cylindrical shape having a short axial dimension, and is inserted into the through-hole 20 from one axial end (rear end) where the gas ejection portion 14A is provided. A flange portion 14B is formed at the central portion in the axial direction of the inflator 14, and the flange portion 14B is in contact with the hole edge portion of the through hole 20 from the front side of the vehicle. An annular ring plate 22 is disposed on the vehicle direction side of the hole edge of the through hole 20. A plurality of (in this case, four) stud bolts projecting from the ring plate 22 penetrate the base plate 18 and the flange portion 14B and are respectively screwed into the nuts. Thereby, the inflator 14 is fixed to the base plate 18.

On the other hand, the airbag 16 is arranged in a folded state on the surface of the base plate 18 on the vehicle rear side. The airbag 16 is formed by sewing four base fabrics 24, 26, 28, and 30 shown in FIGS. 3 (A) to 3 (D). These base fabrics 24, 26, 28, and 30 are made of, for example, nylon or polyester fabric.

The above-described base fabrics 24, 26, 28, and 30 are overlapped with each other in the order described, and the outer peripheral edge portion is sewn at the sewing portion T1. In the base cloths 26 and 28 positioned between the base cloths 24 and 30, inverted U-shaped slits 32 and 34 are formed in the respective central portions. These base fabrics 26 and 28 have the edges of the slits 32 and 34 overlapped with each other, and are sewn along the slits 32 and 34 at the sewing portion T2. Accordingly, the main body portion 16A (bag main body: annular bag portion) which is an annular bag body and the gas introduction portion 16B extending from a part of the inner periphery of the main body portion 16A to the center side of the main body portion 16A. Is formed. The inside of the gas introduction part 16B is communicated with the main body part 16A at a connection part with the main body part 16A.

On the other hand, the base fabric 24 disposed on the opposite side of the base fabric 28 via the base fabric 26 is a driver seat side covering member, and the main body portion 16A and the gas introduction portion 16B are connected to the driver seat when the airbag 16 is inflated and deployed. It is attached to the main body 16A so as to cover from the side. Further, the base fabric 30 disposed on the opposite side of the base fabric 26 via the base fabric 28 is a non-operating seat side covering member, and operates the main body portion 16A and the gas introduction portion 16B when the airbag 16 is inflated and deployed. It is attached to the main body portion 16A so as to cover from the side opposite to the seat.

In the base fabrics 28 and 30 positioned on the opposite side of the driver seat from the base fabrics 24 and 26 in the inflated and deployed state of the airbag 16, circular through holes 36 and 38 are formed in the respective central portions. One end side in the axial direction of the inflator 14 described above is inserted into the through holes 36 and 38. The hole edge portions of these through holes 36 and 38 are overlapped with each other, and are sewn together at a sewing portion T3 (see FIGS. 3 and 4 (not shown in FIG. 1)). In addition, a plurality of bolt holes through which the plurality of stud bolts of the ring plate 22 described above are formed are formed at the hole edge portions of the through holes 36 and 38, and the through holes are formed between the ring plate 22 and the base plate 18. The hole edges of the holes 36 and 38 are sandwiched. Thereby, the airbag 16 is fixed to the base plate 18.

The airbag 16 having the above configuration is normally folded in a predetermined folding manner and is covered with the inflator 14 by a wheel pad (not shown) attached to the central portion of the steering wheel 12. The inflator 14 is electrically connected to an ECU (control device) mounted on the vehicle. The ECU is electrically connected to a longitudinal acceleration sensor that detects acceleration in the longitudinal direction of the vehicle and a lateral acceleration sensor that detects acceleration in the lateral direction of the vehicle. The ECU is configured to operate the inflator 14 when it is detected that the vehicle has collided with the front based on signals from the longitudinal acceleration sensor and the lateral acceleration sensor. This frontal collision includes not only a full-wrapped frontal collision (symmetrical collision) but also an oblique collision and a minute lap collision (both are asymmetrical collisions).

  If a pre-crash sensor for predicting (predicting) a frontal collision is electrically connected to the ECU, the inflator 14 is activated when the ECU predicts a frontal collision based on a signal from the pre-crash sensor. It may be configured as follows. Furthermore, a configuration may be adopted in which an asymmetrical collision is detected using a pair of left and right acceleration sensors attached to the left and right front side members. In this case, the ECU is configured to discriminate between a symmetric collision and an asymmetrical collision by comparing the deviation of the input timing of the signals from the left and right longitudinal acceleration sensors with the magnitude of the output signal of each longitudinal acceleration sensor.

  When the inflator 14 is operated by the ECU, gas is ejected from the gas ejection part 14A of the inflator 14. The ejected gas passes through the gas introduction part 16B of the airbag 16 and is introduced into the main body part 16A. As a result, when the airbag 16 is inflated, the wheel pad described above is broken at the tear line (thin wall portion), and the airbag 16 is inflated and deployed toward the driver seat side of the steering wheel 12. Hereinafter, the inflated and deployed state of the airbag 16 will be described.

  As shown in FIG. 1, the main body 16A is inflated and deployed larger than the outer diameter of the rim 12B of the steering wheel 12, and is supported from the opposite side of the driver's seat by the rim 12B. The main body portion 16A is formed so as to protrude (bulge) toward the driver's seat from the gas introduction portion 16B. In FIG. 1, a gap is formed between the inner periphery of the main body portion 16A and the gas introduction portion 16B. However, the inner periphery of the main body portion 16A and the gas introduction portion 16B may be in contact with each other.

  In this embodiment, since the airbag 16 is attached to the hub 12A of the steering wheel 12 via the base plate 18, the airbag 16 rotates together with the steering wheel 12 when the steering wheel 12 is steered. . In a state where the steering wheel 12 is located on the center side (center and near the center) of the steering angle (steering range) and the airbag 16 is inflated and deployed, the gas introduction part 16B extends downward from the center part of the steering wheel 12. A gas introduction part 16B is provided so as to reach the inner periphery of the main body part 16A. That is, since there are many cases where the steering wheel 12 is not steered greatly at the time of an oblique collision or a minute lap collision, when the airbag 16 is inflated and deployed in this state, the direction of the gas introduction part 16B becomes as described above.

  Further, in the inflated and deployed state of the airbag 16, the base fabric 24, which is the driver seat side covering member, is extended on the driver seat side with respect to the main body portion 16A and the gas introduction portion 16B, and the base fabric 24 is the counter driver seat side covering member. The cloth 30 is stretched on the side opposite to the driver's seat with respect to the main body portion 16A and the gas introduction portion 16B. Thus, the main body portion 16A and the gas introduction portion 16B are covered from the driver seat side by the base cloth 24 and from the opposite side of the driver seat by the base cloth 30. A sealed space 40 in which the gas introduction portion 16B is accommodated is formed between the base fabrics 24 and 30 on the inner peripheral side of the main body portion 16A.

  In the present embodiment, a pair of slit-shaped vent holes 42 (not shown except in FIGS. 5A and 5B) are formed on the inner periphery of the main body portion 16A. These vent holes 42 are formed at positions facing each other, and are formed so that the longitudinal direction thereof is along the axial direction of the steering wheel 12 when the airbag 16 is inflated and deployed. These vent holes 42 are respectively covered with a pair of closing cloths 46 (blocking members: not shown except in FIGS. 1 and 5) attached to the inner periphery of the main body portion 16A.

  Each closing cloth 46 is formed in a rectangular shape by the same cloth material as the base cloths 24, 26, 28, and 30, and three sides are sewn on the inner periphery of the main body part 16A at the sewing part T4. The sewing portion T4 is formed in a substantially U shape that opens to one side in the circumferential direction of the main body portion 16A. When the airbag 16 is inflated and deployed, each closing cloth 46 sticks to the inner peripheral surface of the main body 16A due to the tension of the main body 16A, so that each vent hole 42 is closed. However, when the main body portion 16A is crushed by the load from the driver's seat side, a gap is formed between each closing cloth 46 and the inner peripheral surface of the main body portion 16A, and the gas in the main body portion 16A flows into each vent hole 42. The air is exhausted into the sealed space 40.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  In the driver-seat airbag device 10 having the above-described configuration, the inflator 14 is actuated by the ECU when the vehicle has an oblique collision or a minute lap collision. Then, the gas generated from the inflator 14 is introduced into the main body portion 16 </ b> A through the gas introduction portion 16 </ b> B of the airbag 16. As a result, the main body portion 16A is supported by the rim 12B of the steering wheel 12 from the side opposite to the driver seat, and is inflated and deployed to the driver seat side with respect to the gas introduction portion 16B. Even in the case of inertial movement, the head portion can be restrained by the main body portion 16A.

  Moreover, in the airbag 16, the main body portion 16A, which is an annular bag body, is inflated and deployed toward the driver's seat side with respect to the gas introduction portion 16B on the inner peripheral side, so that it has a flat spherical shape having an equivalent outer diameter. Compared with the bag, the volume can be reduced. Thereby, the time until the expansion and deployment of the main body portion 16A is completed can be shortened, and the internal pressure can be increased. As a result, the amount of energy absorbed at the beginning when the head enters the airbag 16 can be increased, and the movement of the head can be effectively suppressed at the initial stage of restraint, so that the head restraint performance is good. Can be.

  That is, as in the comparative example shown in FIG. 6, when the airbag 100 is configured by a bag body having an outer shape such as a flat sphere, the volume becomes larger than the airbag 16 in the present embodiment. For this reason, if the output of the inflator is equivalent to that of the present embodiment, the time until the expansion and deployment is completed becomes longer and the internal pressure becomes lower. In this case, the initial energy absorption amount when the head H of the occupant P inertially moving obliquely forward enters the airbag 100 is reduced, but in this embodiment, the energy absorption amount can be increased as described above. .

  In the present embodiment, when the airbag 16 is inflated and deployed, the main body portion 16A and the gas introduction portion 16B are covered with the base fabric 24 from the driver's seat side. For this reason, even if the main body portion 16 </ b> A of the airbag 16 is configured with a small capacity by the annular bag body, the head restraint surface can be widely secured by the base fabric 24. As a result, the head restraint performance can be further improved. In addition, since the base fabric 24 is expanded by the inflation and deployment of the airbag 16, the head restraint surface of the base fabric 24 becomes flat. Thereby, when an occupant's head enters the head restraint surface, it is possible to prevent the head from being inadvertently rotated, thereby preventing head injury caused by the rotation. .

  Further, in the present embodiment, in a state where the steering wheel 12 is located on the center side of the steering angle and the airbag 16 is inflated and deployed, the gas introduction portion 16B extends downward from the center portion of the steering wheel 12 and the main body portion 16A. A gas introduction part 16B is provided so as to reach the inner periphery of the gas. In other words, when the vehicle collides with the front side when the steering wheel is not largely steered, the gas ejected from the inflator 14 flows downward (in the direction of 6 o'clock as viewed from the driver's seat) through the gas introduction portion 16B. It is introduced into the main body 16A. Thereby, the influence of the airbag 16 with respect to the passenger | crew located in an improper position can be suppressed. For example, as shown in FIG. 7, even when the airbag 16 is inflated and deployed in a state where the head H of the occupant P is positioned above the steering wheel 12, the head H is separated from the main body portion 16 </ b> A of the airbag 16. The received expansion pressure can be lowered.

  In the present embodiment, when the airbag 16 is inflated and deployed, the pair of closing cloths 46 attached to the inner periphery of the main body portion 16A receives the tension from the main body portion 16A and closes the pair of vent holes 42. Thereby, since the internal pressure at the initial stage of expansion and deployment of the main body portion 16A can be increased, the occupant initial restraining performance of the main body portion 16A can be ensured satisfactorily. On the other hand, when the main body portion 16A is crushed by the load from the occupant's head, the tension applied to each closing cloth 46 decreases, and a gap is formed between each closing cloth 46 and the inner peripheral surface of the main body portion 16A. The Thereby, each vent hole 42 is opened, and the gas in the main body portion 16A is exhausted from each vent hole 42. However, since the gas is exhausted after the head enters the airbag 16, the main body portion 16A The time for keeping the internal pressure at a high pressure (internal pressure holding time) can be lengthened.

  Moreover, in the present embodiment, the main body portion 16A and the gas introduction portion 16B of the airbag 16 are covered with the base fabrics 24 and 30 from the driver seat side and the counter driver seat side, and the gas from each vent hole 42 is sealed space. 40 is exhausted. That is, since no gas is exhausted to the outside of the airbag 16, the time for maintaining the internal pressure of the airbag 16 can be further increased. In particular, at the time of a small lap collision, the acceleration (deceleration) of the floor of the vehicle body rises gently, so the timing at which the head enters the airbag 16 is slower than at the time of a full lap front collision. Since the internal pressure of the airbag 16 is maintained for a long time, the initial restraining performance of the head can be improved.

  Moreover, since the support of the airbag 16 with respect to the steering wheel 12 is stabilized due to an increase in the gas pressure in the sealed space 40, the inclination of the airbag 16 when the head that moves diagonally forward enters the airbag 16. (Falling) can be suppressed. Furthermore, since the output of the inflator 14 can be reduced, the inflator 14 can be reduced in size and cost.

  In this embodiment, the longitudinal direction of each slit-shaped vent hole 42 is formed along the axial direction of the steering wheel 12 in the inflated and deployed state of the airbag 16. For this reason, when the airbag 16 is crushed in the axial direction of the steering wheel 12 by a load from the head, each vent hole 42 is deformed into a substantially rhombus shape (substantially lemon shape) when viewed from the radial direction of the airbag 16. Will do. Thereby, each vent hole 42 can be opened favorably.

  Further, in the airbag 16, a pair of base fabrics 26, 28 that are overlapped with each other are sewn on the outer peripheral edge, and the edges of the slits 32, 34 formed on the center side of each base fabric 26, 28, respectively. The parts are overlapped with each other and sewn to partition the body part 16A and the gas introduction part 16B. As a result, the main body portion 16A, which is an annular bag body, and the gas introduction portion 16B extending from a part of the inner periphery of the main body portion 16A can be manufactured by the pair of base fabrics 26, 28. The configuration of the airbag 16 can be simplified.

<Supplementary explanation of the embodiment>
In the above embodiment, the main body portion 16A and the gas introduction portion 16B of the airbag 16 are formed by the pair of base fabrics 26 and 28. However, the present invention is not limited to this, and the main body portion and the gas introduction portion are not limited to this. The manufacturing method can be changed as appropriate.

  In the above embodiment, the vent hole 42 and the closing cloth 46 (closing member) are provided on the inner periphery of the main body portion 16A. However, the present invention is not limited to this, and the vent hole and the closing member are the main body portion. You may make it the structure provided in the outer periphery. In addition, the vent hole and the closing member may be omitted.

  Furthermore, in the said embodiment, although the airbag 16 was set as the structure provided with the base fabric 24 (driver's seat side coating | coated member) and the base fabric 30 (anti-driver's seat side coating | coated member), this invention is not limited to this, One or both of the driver seat side covering member and the anti-driver seat side covering member may be omitted. The driver's seat side covering member can also be formed of a material other than the base fabric (cloth material), for example, a net-like material or a sheet-like material.

  In the above embodiment, in the state where the steering wheel 12 is located on the center side of the steering angle and the airbag 16 is inflated and deployed, the gas introduction portion 16B extends downward from the center portion of the steering wheel 12 and the main body portion 16A. However, the present invention is not limited to this, and the direction in which the gas introduction part 16B extends can be changed as appropriate.

  In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to the above embodiment.

10 Airbag device for driver's seat 12 Steering wheel 12B Rim 14 Inflator (gas generator)
16 Airbag 16A Body 16B Gas inlet 24 Base fabric (driver seat side covering member)
26, 28 A pair of base fabrics 30 overlapped with each other 30 base fabrics (anti-driver seat side covering member)
32, 34 Slit 42 Vent hole 46 Closing cloth (blocking member)

Claims (6)

A gas generator that is provided on a steering wheel of a vehicle and generates gas by operating;
A gas introduction part extends from a part of the inner periphery of the main body part that is an annular bag body, and the gas is introduced into the main body part through the gas introduction part, so that the main body part of the steering wheel is An airbag that is supported from the opposite side of the driver's seat by the rim and that is inflated and deployed to the driver's seat side from the gas introducing portion;
A driver's seat airbag device comprising:   2. The driver seat airbag according to claim 1, wherein the airbag has a driver seat side covering member attached to the main body portion so as to cover the main body portion and the gas introduction portion from the driver seat side during the inflation and deployment. apparatus.   At least when the steering wheel is positioned at the center of the steering angle and the airbag is inflated and deployed, the gas introduction part extends downward from the center of the steering wheel to reach the inner periphery of the main body. The driver seat airbag device according to claim 1, wherein the gas introduction part is provided in the driver's seat.   The driver seat according to any one of claims 1 to 3, wherein the main body portion is provided with a vent hole and a closing member that closes the vent hole by a tension during expansion and deployment of the main body portion. Air bag device. The airbag includes a driver-seat-side covering member attached to the main body so as to cover the main body and the gas inlet from the driver's seat during the inflation and deployment, and the main body and the gas introduction during the inflation and deployment. An anti-driver's seat side covering member attached to the main body so as to cover the part from the side opposite to the driver's seat,
The airbag device for a driver's seat according to claim 4, wherein the vent hole and the closing member are provided on an inner periphery of the main body.   In the airbag, a pair of base fabrics overlapped with each other is sewn on an outer peripheral edge portion, and edges of slits respectively formed on the center side of the respective base fabrics are overlapped with each other and sewn. The airbag device for a driver's seat according to any one of claims 1 to 5, wherein the airbag device is partitioned into a main body portion and the gas introduction portion.

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