JP4560984B2 - Airbag device for driver's seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention protects a human body by expanding in an emergency such as a collision of a high-speed moving body such as a vehicle.For driver's seatAirbagapparatusAbout.
[0002]
[Prior art]
  The driver airbag device includes an airbag formed by sewing the peripheral portions of the front panel and the rear panel each made of a circular cloth. In the center of the rear panel, an inflator engagement opening for receiving the tip end side of the inflator is provided. The periphery of this opening is attached to the retainer by bolts, pins, rivets and the like. The rear panel is provided with a vent hole for releasing the gas in the bag and absorbing the shock when the driver's seat occupies the airbag.
[0003]
  In JP-A-1-247242, an inner panel is provided so as to be bridged between an inflator opening of a rear panel and a front panel, and the interior of the airbag is divided into a central first chamber and a peripheral second chamber. An air bag is described. The inner panel has a substantially circular shape, and an outer peripheral edge thereof is connected to an intermediate portion between the center and the peripheral edge of the front panel. An opening for an inflator is provided at the center of the inner panel, and an edge portion of the opening is attached to the retainer together with the rear panel. The inner panel is provided with a communication port. When the inflator is activated, the first chamber first expands, and then the second chamber expands. Gas flows from the first chamber into the second chamber through the communication port.
[0004]
[Problems to be solved by the invention]
  The present invention thus provides an airbag whose interior is partitioned into a first chamber and a second chamber by the inner panel.Airbag device for driver's seat equipped withInThe airbagThe purpose is to reduce the weight.
[0005]
  The present invention provides an air bag in which the balance of expansion of the first chamber and the second chamber is suitable.Airbag device for driver's seat equipped withThe purpose is to provide.
[0006]
  The present invention is an airbag in which the size of the first chamber at the time of inflation is suitable.Airbag device for driver's seat equipped withThe purpose is to provide.
[0007]
  The present invention relates to an airbag whose interior is partitioned into a first chamber and a second chamber by an inner panel.Airbag device for driver's seat equipped withBecauseOf the airbagRelatively easy to manufactureAirbag device for driver's seatThe purpose is to provide.
[0008]
[Means for Solving the Problems]
  The present inventionAn airbag device for a driver's seat installed in a steering wheel, wherein the airbag device for a driver's seat is an airbag that inflates toward the passenger side of the steering, an inflator for inflating the airbag, and the airbag And a retainer to which an inflator is attached, and the airbag,It has a front panel disposed on the occupant side and a rear panel disposed on the opposite side of the occupant, and the front panel and the rear panel are combined with each other at their peripheral portions to form a bag. An opening for the inflator is provided, and an inner panel that divides the inside of the bag into a central first chamber and a second chamber surrounding the first chamber is disposed, and in the center of the inner panel, the rear panel An opening arranged substantially concentrically with the opening is provided, and a peripheral edge portion of the inner panel is coupled to an intermediate portion between a central portion and a peripheral edge portion of the front panel, and the inner panel Is provided with a communication port for communicating the first chamber and the second chamber.For driver's seatAirbagapparatusIt is about.
[0009]
  The present invention (Claim 1)ofFor driver's seatAirbagapparatusThe inner panel has a fineness of the front and rear panels.DegreeBigThe total opening area of the communication port of the inner panel is 1.4 to 10% of the area of the inner panel facing the first chamber, and the volume V of the first chamber ₁ And the volume V of the first chamber ₁ And the volume V of the second chamber ₂ Sum V ₁ + V ₂ % Of V ₁ / (V ₁ + V ₂ ) × 100 (%) is 50% or more, and the front panel, the inner panel, and the rear panel are all circular, the outer peripheral edges of the front panel and the rear panel are sewn, and the sewing diameter is b. The outer peripheral edge of the inner panel is sewn, the sewing diameter is a, the percentage a / b × 100 (%) of a and b is 70 to 90%, and the opening edge at the center of the inner panel Is not connected to either the front panel or the rear panel, and the opening edge at the center of the inner panel and the rear panel is fixed to the retainer by a presser ring. Is provided outside the steering outer diameter in the expanded stateIt is characterized by this.
[0010]
  TakeIn the airbag device for a driver's seat of the present invention,Airbags have a small front panel and rear panel weight, and are small in volume when folded.. MaIn addition, the fineness of the base fabric of the inner panel was made larger than the fineness of the base fabric of the front panel and rear panel.ByThe inner panel has high strength, and it is not necessary to provide a reinforcing material such as a patch cloth at the opening provided at the center of the inner panel or the peripheral edge of the communication port. Even without this reinforcing material, when the first chamber is fully expanded by gas at the start of expansion and a large stress is applied to the inner panel, the inner panel can sufficiently resist this stress. In addition, the base fabric of the front panel and the rear panel is preferably 235 to 400 dtex, and the base fabric of the inner panel is preferably 235 to 470 dtex..
[0011]
  For the driver's seat of the present inventionAirbagapparatusIn that,AirbagThe balance of the increase in internal pressure in the first chamber and the second chamber is good.
[0012]
  When the opening area ratio is smaller than 1.4%, the internal pressure of the first chamber in the initial stage of expansion is excessive, and when it is larger than 10%, the increase in the internal pressure of the first chamber is excessively slowed..
[0013]
  In the airbag device for a driver's seat of the present invention,The airbag has a sufficient thickness (distance from the rear panel to the front panel) of the first chamber when inflated, and an increase in internal pressure is in a suitable range.
[0014]
  V₁/ (V₁+ V₂) When the value of x100% is smaller than 50%, the thickness of the first chamber at the time of expansion becomes too small..
[0015]
  In the airbag device for a driver's seat of the present invention,AirbagButWhen inflated, the thickness of the first chamber in the airbag is sufficient, and the increase in internal pressure is in a suitable range.
[0016]
  Claim2ofFor driver's seatAirbagapparatusClaims1The crossing angle in the yarn direction between the inner panel and the front panel is 20 to 45 °.
[0017]
  When the inner panel and the front panel are stitched at such a stitching angle, the connection strength between the inner panel and the front panel becomes extremely high..
[0018]
  The airbag device for a driver's seat of the present inventionIn the airbag, the peripheral edge of the opening of the inner panel is not coupled to the front panel or the rear panel, so that it can be manufactured relatively easily without taking time and effort.
[0019]
  Claim3ofFor driver's seatAirbagapparatusClaim 1Or 2The vent hole is provided in the rear panel, and the positional relationship between the vent hole and the communication port of the inner panel is inconsistent. The mismatch in the positional relationship between the vent hole and the communication port refers to a position where the vent hole and the communication port do not face each other when the airbag is inflated. For example, the communication port and the vent hole are mutually connected to the airbag. A positional relationship in which the phase is shifted in the circumferential direction, or a positional relationship in which the communication port and the vent hole are respectively disposed at different radial positions from the center of the airbag.
[0020]
  By configuring in this way, the gas flowing into the second chamber from the first chamber through the communication port when the airbag is inflated does not go straight and flow out of the airbag from the vent hole. It can be inflated to ensure a predetermined size and internal pressure.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below with reference to the drawings.And reference examplesWill be described.
[0022]
  FIG. 1 shows an airbag for a driver's seat of an automobile according to an embodiment of the present invention.GroupFIG. 2 is an exploded perspective view of the airbag and the airbag device, and FIG. 5 is an explanatory view of the front panel and the inner panel in the yarn direction.
[0023]
  The airbag 10 includes a front panel 12, a rear panel 14, and an inner panel 22 each made of a circular woven fabric. The front panel 12 and the rear panel 14 have the same diameter, and are formed into a bag shape by stitching their outer peripheral edges. The stitched portion has an annular shape that circulates along the outer peripheries of the front panel 12 and the rear panel 14. The diameter of this circular ring in a state where the panels 12 and 14 are spread flat is defined as “b”.
[0024]
  The rear panel 14 is provided with an inflator opening 16 and a vent hole 18. The airbag 10 is inflated by introducing gas from the inflator through the opening 16. A bolt insertion hole 20 is provided around the opening 16 of the rear panel 14. In the airbag 10, as the base fabric of the front panel 12 and the rear panel 14, an airbag having a relatively small weight when folded is used. As the base fabric of the front panel 12 and the rear panel 14, those having a fineness of 235 to 400 dtex (decitex) are preferable.
[0025]
  A circular inner panel 22 is provided inside the airbag 10. The inner panel 22 is disposed substantially concentrically with the front panel 12 and the rear panel 14, and a peripheral portion thereof is stitched to an intermediate portion between the central portion and the peripheral portion of the front panel 12. Reference numeral 22 ′ in FIG. 2 indicates the stitched portion (stitch). The seam 22 'has an annular shape, and the diameter of the annular shape is "a".
[0026]
  In the center of the inner panel 22 is provided an inflator opening 24 that is disposed substantially concentrically with the inflator opening 16 of the rear panel 14. These openings 16 and 24 have substantially the same diameter. In addition, a bolt insertion hole 26 that overlaps the bolt insertion hole 20 of the rear panel 14 is provided around the opening 24 of the inner panel 22. The peripheral edge portion of the inflator opening 24 of the inner panel 22 is overlapped with the peripheral edge portion of the inflator opening 16 of the rear panel 14, and is overlapped with the peripheral edge portion of an inflator mounting port 32 of the retainer 30 described later. The peripheral portions of the inflator openings 24 and 16 are fixed to the retainer 30 through the bolt insertion holes 26 and 20. As a result, the peripheral edge of the inflator opening 24 of the inner panel 22 is connected to the peripheral edge of the inflator opening 16 of the rear panel 14, and the outer peripheral edge of the inner panel 22 is connected to the front panel 12 by the stitched portion 22 '. . The inner panel 22 divides the interior of the airbag 10 into a central first chamber 1 and a second chamber 2 surrounding the first chamber 1.
[0027]
  A diameter (hereinafter referred to as a sewing diameter) a of the stitching portion 22 ′ between the outer peripheral edge portion of the inner panel 22 and the front panel 12 and a stitching diameter b of the outer peripheral edge portion of the front panel 12 and the rear panel 14. The percentage a / b × 100 (%) is 70 to 90%. As a result, the volume V of the first chamber 1 during expansion₁And the space volume in the airbag 10 when inflated (the volume V of the first chamber 1)₁And the volume V of the second chamber 2₂Sum V₁+ V₂Ratio V)₁/ (V₁+ V₂) Is 50% or more, for example, 50 to 75%.
[0028]
  Further, as shown in FIG. 5, the crossing angle θ in the yarn direction between the inner panel 22 and the front panel 12 each made of woven fabric is 20 to 45 °, whereby the inner panel 22 and the front panel 12 The bond strength is very strong. This crossing angle θ is the crossing angle between the warp of the inner panel 22 and the warp of the front panel 12.
[0029]
  As shown in FIG. 2, the inner panel 22 has a plurality (four in this embodiment) of communication ports 28 at equal intervals in the circumferential direction in the region between the peripheral edge portion and the central portion. Is provided. The first chamber 1 and the second chamber 2 in the airbag 10 are communicated with each other through the communication port 28. The total opening area of the communication port 28 is the area of the surface of the inner panel 22 facing the first chamber 1 (that is, the area of the inner panel 22 inside the stitching portion 22 ′. This area is the opening of the communication port 28. It is 1.4 to 10% of the area.
[0030]
  Note that this communication port 28 is located outside the outer diameter of the steering.On the sideIs provided. Thus, even if the occupant collides with the inflated airbag 10 and strongly presses the airbag 10, even if the inner panel 22 is pressed between the steering and the occupant inside the airbag 10, the communication port 28 is still in the steering position. The gas flow between the first chamber 1 and the second chamber 2 in the airbag 10 is guaranteed.
[0031]
  The communication port 28 is disposed at a position out of phase with the vent hole 18 provided in the rear panel 14 in the circumferential direction of the airbag 10, and the communication port 28 and the rear panel 14 do not face each other when the airbag is inflated. It is like that. As a result, the gas flowing into the second chamber 2 from the first chamber 1 through the communication port 28 of the airbag 10 is prevented from going straight and flowing out of the airbag from the vent hole 18.
[0032]
  By arranging the communication port 28 and the vent hole 18 so that their radial positions from the center of the airbag 10 are different from each other, the communication port 28 and the vent hole 18 do not face each other.IYou may do it. Of course, both the phase in the circumferential direction of the airbag 10 and the radial position of the communication port 28 and the vent hole 18 may be shifted.
[0033]
  In this embodiment, as the base fabric of the inner panel 22, a fabric having a fineness higher than that of the base fabric of the front panel 12 and the rear panel 14 is used. Therefore, the inner panel 22 can sufficiently resist the stress from the airbag 10 when inflated. However, as the base fabric of the inner panel 22, a fabric having the same fineness as the base fabric of the front panel 12 or the rear panel 14 may be used. In this case, the peripheral portion of the opening 24 or the communication port 28 By attaching a reinforcing patch or the like to the inner panel 22, sufficient strength can be given to the inner panel 22. The fineness of the base fabric used for the inner panel 22 is preferably about 235 to 470 dtex.
[0034]
  When manufacturing the airbag 10, first, the inner panel 22 is concentrically overlapped in advance with the inner surface of the front panel 12 (the surface disposed inside the completed airbag 10). The peripheral edge portion is sewn in an annular shape between the peripheral edge portion and the intermediate portion of the front panel 12 with a sewing diameter a (the stitching portion 22 ′ is formed by this stitching). Next, the front panel 12 and the rear panel 14 are overlapped so that the outer surfaces (surfaces disposed outside the completed airbag 10) face each other, and the outer peripheral edges are annularly formed with a sewing diameter b. A bag is formed by sewing. Thereafter, the airbag 10 is completed by inverting the front panel 12 and the rear panel 14 through the inflator opening 16 of the rear panel 14 so that the inner panel 22 is inside the bag-like body.
[0035]
  Depending on the specifications of the airbag 10 and the method of coupling the front panel 12 and the rear panel 14, the inner panel 22 may be connected to the front panel 12 and the rear panel 14 when the front panel 12 and the rear panel 14 are coupled. These inner side surfaces may face each other so as to be sandwiched between the outer peripheral edges of the front panel 12 and the rear panel 14 in this state. In this case, the trouble of inverting the front panel 12 and the rear panel 14 can be saved, and the airbag 10 can be easily manufactured.
[0036]
  The retainer 30 for attaching the airbag 10 is provided with an inflator attachment port 32 at the center and a bolt insertion hole 34 around the inflator attachment port 32.
[0037]
  A bolt insertion hole 40 is provided in the flange 38 of the inflator 36. The inflator 36 is fitted into the inflator attachment port 32 of the retainer 30.
[0038]
  In attaching the airbag 10 to the retainer 30, the peripheral portions of the inflator openings 16 and 24 of the rear panel 14 and the inner panel 22 are pressed against the peripheral portion of the inflator mounting port 32 of the retainer 30 by the press ring 42.
[0039]
  At this time, the stud bolt 44 of the presser ring 42 is passed through the bolt insertion holes 26, 20, 34, 40, and the nut 46 is tightened at the tip thereof, thereby fixing the inner panel 22, the airbag 10 and the inflator 36 to the retainer 30. To do. And the airbag apparatus shown in FIG. 1 is comprised by folding the airbag 10 and attaching the module cover 48 to the retainer 30 so that the folding body of this airbag 10 may be covered. This airbag device is installed on a steering wheel (not shown) of an automobile.
[0040]
  When tension occurs during a vehicle collision or the like, the inflator 36 is activated and gas is ejected into the airbag 10. The airbag 10 is inflated by this gas, pushes and opens the module cover 48, and deploys in the vehicle compartment to protect the driver's seat occupant. At this time, in the airbag 10, the first chamber 1 is first inflated quickly by the gas from the inflator 36. Then, the gas in the first chamber 1 flows into the second chamber 2 through the communication port 28, and the second chamber 2 is expanded following the first chamber 1.
[0041]
  In the airbag 10, since the base fabric having a small fineness is used as the front panel 12 and the rear panel 14, the weight is relatively light and the volume of the folded body is small. Further, when the inner panel 22 is also made of a base fabric having the same fineness as the base fabric of the front panel 12 and the rear panel 14, the airbag 10 is made lighter and the volume of the folded body is small. be able to. And it becomes possible to relieve | moderate the increase in the weight of an airbag apparatus, and enlargement by this. Since the inner panel 22 itself and the connecting portion between the inner panel 22 and the front panel 12 are given sufficient strength, the first chamber 1 of the airbag 10 is fully inflated by the gas from the inflator 36. Even if a large stress is applied to the inner panel 22, the inner panel 22 can sufficiently resist the stress.
[0042]
  In the airbag 10, the balance of the increase in internal pressure in the first chamber 1 and the second chamber 2 at the time of inflation is good, and the amount of gas flowing into the second chamber 2 is too small. The internal pressure of the chamber 1 does not become excessive, and conversely, the flow rate of gas into the second chamber 2 is not excessive, and the increase in the internal pressure of the first chamber 1 is not excessively slowed.
[0043]
  Further, in the airbag 10, the first chamber 1 quickly expands to a sufficient thickness when the airbag is inflated, and an increase in internal pressure in the first chamber 1 is also in a suitable range.
[0044]
  The airbag 10 is manufactured relatively easily because the peripheral portion of the inflator opening 24 at the center of the inner panel 22 is not coupled to the rear panel 14.
[0045]
  In the above-described embodiment, four circular communication ports 28 are provided at equal intervals in the circumferential direction of the inner panel 22, but the number and shape of the communication ports provided in the inner panel are the opening area. Is not particularly limited as long as the sum of is within the above-mentioned range. In addition, the shape and arrangement of the inner panel are also the volume V of the first chamber 1 when the airbag is partitioned into the first chamber 1 and the second chamber 2.₁Is within the above-mentioned range, and is not particularly limited.
[0046]
  As the inner panel, those shown in FIGS. 3A to 3C may be used.
[0047]
  The inner panel 22A shown in FIG. 3 (a) has four notches 50 provided at equal intervals in the circumferential direction on the outer peripheral edge. The inner panel 22A has an outer peripheral edge portion of the airbag 10 excluding the notch 50 coupled to the inner peripheral surface of the front panel 12, and the notch 50 allows the first chamber and the first chamber in the airbag 10 to A communication port communicating with the two chambers is formed.
[0048]
  The inner panel 22B of FIG. 3 (b) is provided with eight slit-shaped communication ports 52 extending in the radial direction at equal intervals in the circumferential direction in the region between the peripheral edge portion and the central portion. .
[0049]
  The inner panel 22C in FIG. 3 (c) includes eight small-hole communication ports 54 in a region between the peripheral edge portion and the central portion. FIGS. 3A to 3C show a state in which the inner panel is flattened. Other configurations of the inner panels 22A to 22C are the same as those of the inner panel, and the same reference numerals as those in FIGS. 1 and 2 indicate the same parts..
[0050]
  First4 (a) to (d)Reference exampleIt is a front view of airbag 70A-70D for passenger seats of the car which concerns on. Each of the airbags 70A to 70D has a front panel 72 and a rear panel 74 each having a substantially rectangular shape (may be a substantially trapezoidal shape). It is considered as a bag constituting the shell portion.
[0051]
  Each of the airbags 70A to 70D is connected to a front opening of a container (not shown) for accommodating the airbags 70A to 70D in the vicinity of the center portion of the rear panel 74, and an inflator (illustrated) installed in the container. An opening 76 is provided for introducing gas from (omitted) into the airbag. Further, the rear panel 74 has a vent hole (not shown) for absorbing a shock by allowing the gas in the airbags 70A to 70D to flow out to the outside when the occupant has thrust into the airbags 70A to 70D when the airbag is inflated. Abbreviation) is provided.
[0052]
  Each of the airbags 70 </ b> A to 70 </ b> D is partitioned into a first chamber and a second chamber by inner panels 80 </ b> A to 80 </ b> D, similarly to the airbag 10. The first chamber is disposed on the center side of the airbags 70A to 70D, and the second chamber is provided around the outer periphery of the airbags 70A to 70D so as to surround each first chamber. Each of the inner panels 80A to 80D is provided with an inflator opening 82.
[0053]
  A substantially rectangular inner panel 80A is provided in the airbag 70A shown in FIG. The inner panel 80A is arranged such that the extending direction of the long side and the short side is parallel to the extending direction of the long side and the short side of the front panel 72, respectively. The inner panel 80A has a peripheral edge portion connected between the outer peripheral edge portion and the central portion of the front panel 72 by a connecting means such as sewing. In the vicinity of the center of the inner panel 80A, an opening 82 that overlaps with the opening 76 of the rear panel 74 and has substantially the same shape as the opening 76 is provided.
[0054]
  The inner panel 80A is bridged between the front panel 72 and the rear panel 74 by attaching the peripheral edge of the opening 82 to the peripheral edge of the front opening of the container together with the peripheral edge of the opening 76 of the rear panel 74. The interior of the bag 70A is partitioned into a central first chamber and a second chamber surrounding the first chamber.
[0055]
  A total of four circular communication ports 84 are provided on the diagonal line of the inner panel 80A.
[0056]
  A substantially oval inner panel 80B extending long in the longitudinal direction of the front panel 72 is provided inside the airbag 70B in FIG. 4 (b). The inner panel 80B is provided with four circular communication ports 86.
[0057]
  Inside the airbag 70C of FIG. 4 (c), there is provided a substantially bowl-shaped inner panel 80C extending in the longitudinal direction of the front panel 72 and having a constricted middle portion in the longitudinal direction. Communication ports 88 are provided in the vicinity of the four corners of the inner panel 80C.
[0058]
  A circular inner panel 80D is provided inside the airbag 70D of FIG. 4 (d) so as to occupy the center of the front panel 72. Communication ports 90 are provided at the upper and lower portions of the inner panel 80D.
[0059]
  The airbags 70A to 70D are folded and accommodated in a container, and a lid is attached to the front opening of the container.
[0060]
  Also in these passenger seat airbags 70A to 70D, when the inflator is activated in the event of a vehicle collision, the gas ejected from the inflator flows into the first chamber of each airbag through the inflator openings 76 and 82, and One chamber is inflated. Thereby, the airbag pushes open the lid and expands outside the container. After that, gas flows from the first chamber to the second chamber through the communication port 84, 86, 88 or 90, and the second chamber expands. As a result, the airbags 70A to 70D are largely deployed vertically and horizontally in front of the passenger on the passenger seat.
[0061]
【The invention's effect】
  As described above in detail, according to the present invention, the airbag is divided into the first chamber and the second chamber by the inner panel.Airbag device for driver's seat equipped withInAirbagAnd the balance of expansion of the first chamber and the second chamber is suitable,AirbagThe size of the first chamber during expansion is suitable,Air bagRelatively easy to manufactureFor driver's seatAirbagapparatusIs provided.
[Brief description of the drawings]
FIG. 1 relates to an embodiment of the present invention.For driver's seatIt is sectional drawing of an airbag apparatus.
2 is an exploded perspective view of the airbag device of FIG. 1. FIG.
FIG. 3 is a view showing another embodiment of the inner panel.
[Fig. 4]Reference exampleIt is a front view of the airbag for passenger seats concerning.
FIG. 5 is an explanatory diagram of the yarn direction of the front panel and the inner panel.
[Explanation of symbols]
  1 Room 1
  2 Room 2
  10 Airbag for driver's seat
  12 Front panel
  14 Rear panel
  16 Inflator opening
  18 Bent hole
  22, 22A, 22B, 22C Inner panel
  24 opening
  28, 52, 54 Communication port
  30 Retainer
  32 Inflator mounting port
  36 inflator
  42 Presser ring
  50 recess
  70A, 70B, 70C, 70D Airbag for passenger seat
  72 Front panel
  74 Rear panel
  76 opening
  80A, 80B, 80C, 80D Inner panel
  82 Inflator opening
  84, 86, 88, 90

Claims (6)

An airbag device for a driver's seat installed on a steering wheel,
The airbag device for a driver's seat includes an airbag that inflates to the passenger side of the steering wheel,
An inflator for inflating the airbag;
A retainer opposite to the occupant of the airbag and having an inflator attached thereto;
With
The airbag has a front panel disposed on the occupant side and a rear panel disposed on the opposite side of the occupant, and the front panel and the rear panel are combined with each other at their peripheral portions to form a bag.
In the center of the rear panel, an opening for an inflator is provided,
An inner panel that divides the bag into a central first chamber and a second chamber surrounding the first chamber is disposed,
In the center of the inner panel, there is provided an opening arranged substantially concentrically with the opening of the rear panel,
The peripheral part of the inner panel is coupled to an intermediate part between the central part and the peripheral part of the front panel,
In the airbag device for a driver's seat , the inner panel is provided with a communication port that communicates the first chamber and the second chamber.
Fineness of the inner panel is Ri by fineness of the front panel and the rear panel is also rather large,
The sum total of the opening area of the communication port of the inner panel is 1.4 to 10% of the area of the surface facing the first chamber of the inner panel;
The percentage V ₁ / (V ₁ + V ₂ ) × 100 (%) between the volume V ₁ of the first chamber and the sum V ₁ + V ₂ of the volume V ₁ of the first chamber and the volume V ₂ of the second chamber is 50. % Or more,
The front panel, inner panel and rear panel are all circular,
The outer peripheral edge portions of the front panel and the rear panel are stitched, and the sewing diameter is b.
The outer peripheral edge of the front panel and the inner panel is stitched, and the sewing diameter is a.
The percentage a / b × 100 (%) of a and b is 70 to 90%,
The opening edge at the center of the inner panel is in an uncoupled state with respect to both the front panel and the rear panel,
The central opening edge of the inner panel and the rear panel is fixed to the retainer by a presser ring,
The air bag device for a driver's seat , wherein the communication port is provided outside the outer diameter of the steering wheel in a state where the airbag is inflated . 2. The driver seat airbag device according to claim 1, wherein the crossing angle of the inner panel and the front panel in the yarn direction is 20 to 45 degrees. According to claim 1 or 2, wherein the vent hole is provided in the rear panel, the driver-seat airbag that positional relationship between the vent hole and communicating port of the inner panel is characterized in that become a thing of the mismatch Equipment . In Claim 3, the inner panel is provided with a plurality of communication ports at equal intervals in the circumferential direction in a region between the peripheral edge portion and the central portion.
The airbag for a driver's seat, wherein the communication port and the vent hole are arranged by shifting one or both of a circumferential phase of the airbag and a radial position from the center of the airbag. apparatus. 5. The inner panel according to claim 1, wherein the inner panel is provided with notches in the outer peripheral edge at equal intervals in the circumferential direction, and the outer peripheral edge excluding the notch is the An airbag device for a driver's seat, which is coupled to an inner peripheral surface of a front panel, and the communication port that connects the first chamber and the second chamber is formed by the notch. 5. The driver seat airbag device according to claim 1, wherein the communication port has a slit shape extending in a radial direction of the inner panel. 6.

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