JP2001260790A - Air bag for front passenger seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag for a front passenger seat which can be rapidly deployed along the front passenger seat side surface of an instrument panel at the initial stage of deployment. SOLUTION: The air bag 10 has a gas inflow port 12 disposed along an approximately horizontal plane, and a flow-straightening fabric 20 covering the gas inflow port 12 and varying the flow of inflation gas G flowing therein is disposed inside an air bag body 11. The flow-straightening fabric 20 is positioned to cover the gas inflow port 12 along the horizontal direction of the vehicle and is disposed so that the flow of inflation gas Gb flowing rearwardly of an approximate longitudinal mid position C is greater than the flow of inflation gas Ga flowing forwardly of the position C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag used in a passenger airbag device disposed on an upper side of an instrument panel in front of a passenger seat.

[0002]

2. Description of the Related Art Conventionally, an airbag used in an airbag device for a passenger seat can be deployed in a wide area so as to be substantially vertical when inflated and inflated, and then moved rearward in that state. It has been desired (see Japanese Patent Application Laid-Open No. 11-278192).

[0003] However, in a top-mounted type passenger airbag device arranged on the upper surface side of an instrument panel (hereinafter referred to as an instrument panel) in front of a passenger seat, when a child is approaching the instrument panel. In the initial stage of inflation of the airbag, the airbag is quickly deployed along the passenger side surface of the instrument panel, that is, along the rear surface from the upper surface of the instrument panel, and the airbag portion is arranged between the child and the rear surface of the instrument panel. In some cases, it was requested to do so.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an airbag for a passenger seat that can be quickly deployed along a passenger seat side surface of an instrument panel at an early stage of deployment and inflation.

[0005]

The airbag according to the present invention is used in a passenger airbag device disposed on the upper surface side of an instrument panel in front of a passenger seat, and is disposed substantially along a horizontal plane. An airbag for a passenger seat, comprising a gas inlet, and a rectifying cloth that covers the gas inlet and changes the flow of the inflation gas to be supplied is disposed inside the airbag body, The cloth is arranged so as to cover the gas inflow port in the left-right direction of the vehicle. It is characterized by being provided so as to increase the flow rate.

Then, the flow rate of the inflation gas flowing rearward with respect to a substantially middle portion in the front-rear direction of the flow straightening cloth is made larger than the flow rate of the expansion gas flowing forward. In a state where the front edge and the rear edge are not joined to the airbag body, both edges in the left-right direction are joined to the periphery of the gas inlet on the inner peripheral surface of the airbag body, and disposed. Gas flow holes through which the inflation gas can pass may be provided on both left and right sides of the trailing edge of the rectifying cloth itself.

Further, the rectifying cloth is so arranged that the flow rate of the inflating gas flowing forward with respect to the substantially middle portion of the rectifying cloth in the front-rear direction is smaller than the flow rate of the expanding gas flowing backward. In a state where the rear edge is not joined to the airbag body, both left and right edges and the front edge are joined to the periphery of the gas inlet on the inner peripheral surface of the airbag body, and the airflow body is rectified. Gas flow holes through which inflation gas can pass are disposed between the left and right edges near the front edge of the cloth and the airbag body, or near the left and right sides near the front edge of the rectifying cloth itself. You may do it.

[0008] Further, it is preferable that the trailing edge of the rectifying cloth is connected to the trailing edge side of the peripheral edge of the gas inlet of the airbag body by a connecting belt so that forward movement during inflow of the inflation gas can be regulated.

[0009]

According to the airbag for a passenger seat according to the present invention,
With the straightening cloth arranged in the left and right direction of the vehicle so as to cover the gas inlet, the flow rate of the inflation gas flowing to the rear side at the time of deployment and inflation is increased toward the front side with reference to a substantially middle part in the front and rear direction of the straightening cloth. Because it is larger than the flow rate of the flowing expansion gas,
The lower side of the airbag is easily spread from the upper surface of the instrument panel to the rear surface.

Therefore, the airbag for the passenger seat according to the present invention can be quickly deployed along the surface of the instrument panel on the passenger seat side at the initial stage of deployment and inflation.

In the airbag according to the second aspect of the present invention, gas flow holes through which the inflation gas can pass are provided on the right and left sides of the trailing edge of the straightening cloth itself. In the initial stage of deployment and inflation, when the lower side of the airbag is extended from the upper surface of the instrument panel to the rear surface, the airbag can be deployed with a wider width in the left-right direction.

Further, in the airbag according to the third aspect, the rectifying cloth has substantially three sides of the front and left and right sides other than the rear edge except for the gas circulation holes near the left and right sides on the front edge side. It is joined to the body. Therefore, in the initial stage of deployment and inflation, first, the straightening cloth is inflated into a bag shape, and then a large amount of inflation gas flows from the trailing edge side of the straightening cloth to the lower side of the airbag. At that time, the airbag cover covering the folded airbag can be opened smoothly during the bag-like inflation of the straightening cloth, and then, in that state, a large amount of inflation gas is supplied to the lower side of the airbag. Therefore, the lower side of the airbag further extends along the rear surface from the upper surface of the instrument panel, and as a result, in the initial stage of deployment and inflation, more quickly along the surface of the instrument panel on the passenger seat side. Can be expanded.

Furthermore, in the airbag according to the fourth aspect, the rear edge of the straightening cloth is restricted from moving forward by the connecting belt connected to the peripheral edge of the gas inflow port. In this case, it is possible to avoid a state in which the rectifying cloth is turned forward to open the gas inlet directly in the airbag body. As a result, the flow rate of the inflation gas flowing to the rear side can be stably increased more than the flow rate of the inflation gas flowing to the front side.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 5 and 6, the airbag 10 of the embodiment is used for a top-mount type passenger-side airbag device M1 disposed on the upper surface 1a side of the instrument panel 1. As shown in FIG. 5, the airbag device M1 includes a folded airbag 10, an inflator 34 for supplying an inflation gas to the airbag 10,
A case 36 for storing and holding the airbag 10 and the inflator 34, a retainer 31 for attaching the airbag 10 to the case 36, and a folded airbag 10
An airbag cover 47 for covering the airbag;
Holding plate 45 for firmly connecting the
And is provided.

The retainer 31 for attaching the airbag 10 to the case 36 is made of a rectangular ring-shaped sheet metal and includes a plurality of bolts 31a extending downward at predetermined positions. The retainer 31 connects each bolt 31a to the airbag 10
And the case 3
6 and the holding plate 45, which will be attached to the case 36 by being inserted through a bottom wall portion 39 and a horizontal plate portion 45 a, which will be described later, and screwing a nut 31 b to each bolt 31 a.

The inflator 34 is of a cylinder type and is housed and held in a lower chamber 41 of the case 36 which will be described later.

The airbag cover 47 is made of a thermoplastic elastomer such as polyolefin or polyester, and is provided with a ceiling wall 48 arranged to close the rectangular opening 2 of the instrument panel 1, and a ceiling wall 48. And a substantially rectangular cylindrical side wall portion 49 extending downward from the lower surface of the portion 48. The ceiling wall portion 48 has two door portions 48a, with a thin portion to be broken 48b disposed around the inside surrounded by the side wall portion 49. The breakable portion 48b is substantially H when viewed from above the ceiling wall portion 48.
When the airbag 10 is inflated and ruptured by being pushed by the airbag 10, the door 48a opens as shown by a two-dot chain line in FIGS. In the fore-and-aft direction. A plurality of locking legs 48 protruding downward are provided on the front and rear edges of the ceiling wall portion 48 of the vehicle.
c is formed. Each locking leg 48c is locked on the lower surface side of the flange portion 3 provided with a step on the periphery of the opening 2 of the instrument panel 1. In the side wall portion 49, a plurality of locking holes 49a penetrating in the front-rear direction of the vehicle are formed in a portion in the front-rear direction of the vehicle, and by using these locking holes 49a and the holding plate 45, The side wall portion 49 is connected to an upper chamber 37 of the case 36 which will be described later.

The holding plate 45 is formed of sheet metal and has an L-shaped cross section having a horizontal plate portion 45a and a vertical plate portion 45b extending upward from an end of the horizontal plate portion 45a.
6 of the vehicle 6 in the front-rear direction. A through hole (not shown) for inserting each bolt 31a of the retainer 31 is formed in each horizontal plate portion 45a, and an upper end of each vertical plate portion 45b is inserted into a later-described locking projection 38a of the case 36. It is formed to be possible.

The case 36 is made of sheet metal and has a rectangular parallelepiped upper chamber 37 having an upper opening, and a lower chamber 41 disposed on the lower side of the case 36 so as to communicate with the upper chamber 37.
And is composed of

The upper chamber 37 has a substantially rectangular cylindrical peripheral wall portion 38.
And a bottom wall portion 39 arranged below the peripheral wall portion 38. A locking projection 38a inserted into each locking hole 49a of the airbag cover side wall portion 49 is formed on the peripheral wall portion 38.
Are formed so as to protrude outward. Bottom wall 39
Are formed with through holes (not shown) through which the bolts 31a of the retainer 31 are inserted. On the lower surface of the vehicle in the front-rear direction, horizontal plate portions 45a of the holding plate 45 are respectively provided.
Are arranged in contact with each other.

The lower chamber 41 includes a substantially rectangular cylindrical peripheral wall 42 extending downward from the inner end of the bottom wall 39 and a bottom wall 43 closing the lower end of the peripheral wall 42. ing. A nut 43 a for attaching the case 36 to the body 5 is attached to the bottom wall 43. The bottom wall 43 is attached to a bracket 5b extending from the reinforcement 5a on the body 5 side.
It is attached to the bracket 5b by being screwed into a nut 43a through a connection hole (not shown) provided in the bracket 5b.

As shown in FIGS. 1 to 3, the airbag 10 has an airbag body 11 having a substantially quadrangular truncated pyramid shape when deployed and inflated, and an inflation gas G flowing into the airbag 10. And a connecting belt 29 for preventing the displacement of the rectifying cloth 20.

A gas inlet 12 having a rectangular opening through which the inflation gas G flows is provided in a lower portion on the front side of the vehicle in the airbag body 11. A plurality of mounting holes 14 pass through the periphery of the gas inlet 12, and the bolts 31 a of the retainer 31 are inserted into these mounting holes 14, and the airbag body 11 is attached to the case 3.
6 is held by the bottom wall 39. A reinforcing cloth (not shown) is separately provided in the inner peripheral surface side of the airbag body 11 in the vicinity of the mounting hole 14 on the peripheral edge of the gas inlet 12.

When the airbag 10 is held on the case bottom wall 39 by the retainer 31 and the case 36 is attached to the body 5 and the airbag device M1 is mounted on the vehicle, the gas inlet 12 is closed. The opening surface is arranged so that the front edge 13a side of the opening peripheral edge 13 is slightly higher than the rear edge 13b side and substantially along the horizontal plane.

Further, as shown in FIG. 4, the airbag body 11 is manufactured by stitching first and second base fabrics 16 and 17 woven from yarns such as polyester and polyamide. The cloth 16 is formed in the shape of a gourd with the left and right edges near the center recessed, and the second base cloth 17 is formed in a substantially regular hexagonal shape. The base fabrics 16 and 17 are set so that the three-dimensional airbag body 11 can be sewn by a planar sewing operation.

The sewing of the airbag body 11 will be described. First, at both left and right edges near the gas inlet 12, a reference line 16a extending in the left and right direction on the front edge 13a side of the opening peripheral edge 13 is folded. Utilizing, while suturing the one side 16b, 16b mutually,
The other part 16c on one side is sewn together. By this sewing, the periphery of the end of the first base cloth 16 away from the gas inlet 12 is flattened and the second base 1
7 has the same shape as the outer peripheral edge in a state where it is developed flat.
Therefore, after the portions 16b and 16c of the first base cloth 16 are sewn, the second base cloth 17 is spread flat, and
The airbag main body 11 can be formed in a bag shape by overlapping the peripheral edges of the base cloth 16 away from the gas inlet 12 and suturing the overlapped outer peripheral edges using the suture thread 18.

Actually, after the airbag body 11 is formed in a bag shape so that the seam allowance at the time of suturing the respective portions 16b and 16c is not exposed on the outer peripheral surface side of the airbag 10, the gas flow is performed. Using the inlet 12, the airbag body 1
1 will be turned over.

Before the airbag body 11 is formed into a bag shape, the airflow is regulated around the gas inlet 12 located on the inner peripheral surface side of the airbag 10 in the first base cloth 16 as will be described later. The cloth 20 and the connecting belt 29 (and a reinforcing cloth (not shown)) are joined in advance.

As shown in FIGS. 1 to 4, the rectifying cloth 20 is woven from a yarn such as polyester or polyamide, and can cover the gas inlet 12. As a rectangular shape, when the airbag 10 is deployed and inflated, the flow rate of the inflation gas Ga flowing to the front side is larger than the flow rate of the inflation gas Ga flowing to the rear side with respect to the substantially middle portion C in the front-rear direction facing the vicinity of the center of the gas inlet 12. The gas Gb is provided so as to increase the flow rate thereof.

In the case of the embodiment, as shown by the two-dot chain line in FIG. 4A, the trailing edge 20b of the straightening cloth 20 is not joined to the first base cloth 16 of the airbag body 11, and the left and right sides are not joined. The edges 20 c and 20 d and the front edge 20 a are joined to the peripheral portion 13 of the gas inlet 12 on the inner peripheral surface of the first base cloth 16 of the airbag body 11 by using the suture 18, and are disposed. ing. The straightening cloth 20 is arranged so that the center in the left-right direction is aligned with the center in the left-right direction of the gas inlet 12, and the leading edge 20 a exceeds the gas inlet 12, and furthermore, the reference line of the first base cloth 16. Joined to the front side beyond 16a,
The left and right edges 20c and 20d do not sew the vicinity of the front edge 20a with the first base cloth 16.

Therefore, in the airbag 10 of the embodiment, the right and left edges 20 near the front edge 20 a of the rectifying cloth 20.
c, 20d side and the first base cloth 16 of the airbag body 11, and between the trailing edge 20b of the straightening body 20 and the airbag body 1
Between the first base cloth 16 and the inflation gas Ga.
-Gas flow holes 25, 26 and 27 that can pass through Gb are provided.

When the airbag 10 is deployed and inflated, the inflation gas Ga.
Regarding the flow rate of Gb, the opening area of each gas flow hole 25, 26, 27 is set such that the flow rate passing through gas flow hole 27 is larger than the total value of the flow rate passing through gas flow holes 25, 26. ing. Further, in the case of the embodiment, the left and right gas circulation holes 25 and 26 are provided with the inflation gas Ga
The opening areas are set to be substantially equal to each other so that the flow rates are equal.

A connection belt 29 for connecting the two is provided between the vicinity of the center of the rear edge 20b of the flow regulating body 20 and the rear edge 13b of the opening peripheral edge 13 of the first base cloth 16 of the airbag body 11. Are arranged. The connecting belt 29 is woven from a thread such as polyester or polyamide and has a flexible band shape. The both ends 29a and 29b are respectively formed on the trailing edge 20b and the trailing edge 13b using the suture thread 18. Connected. The connection belt 29 restricts the flow of the rectifier 20 from moving forward from the region of the gas inlet 20 perpendicular to the opening of the gas inlet 12 when the inflation gas G flows in from the gas inlet 12. The length and the width are set within a range that does not cause a decrease in the flow rate of the inflation gas Gb passing through the gas flow holes 27. Further, an end portion 29a to be joined to the opening peripheral rear edge 13b of the connection belt 29.
Is a position that is arranged on the case bottom wall portion 39 when mounted on a vehicle.

The connecting belt 29 may be formed integrally with the rectifying cloth 20 so as to extend from the trailing edge 20b.

The manufacturing of the airbag 10 according to the embodiment will be described first.
A not-shown reinforcing cloth and a rectifying cloth 20 are joined to the opening peripheral edge 13 of the gas inlet 12 on the inner peripheral surface side of
The connection belt 29 is joined to the rectifying cloth 20 and the first base cloth 16. Next, the edge portions 16b, 16b of the first base portion 16 are joined to the edge portions 16c, 16c, and the gas inlet 1
If the peripheral edge of the second base cloth 17 and the peripheral edge of the second base cloth 17 are joined to each other and turned over using the gas inlet 12,
The airbag 10 can be manufactured.

When it is difficult to turn over the gas using the gas inlet 12, the rectifying cloth 20 and the connecting belt 29 are divided at a position separated from a part to be joined to the base cloth 16. Then, these divided bodies are previously joined to the base 16 side, and after forming the airbag main body 11, the inside of the body is turned over by using the gas inlet 12 and thereafter, the ends of the predetermined divided bodies are separated by gas. The airbag 10 may be manufactured by being pulled out from the inflow port 12 and joined.

The mounting of the airbag 10 manufactured as described above on a vehicle will be described. First, the airbag 10 is provided with the retainer 31 disposed inside so that the bolts 31a protrude from the mounting holes 14. Fold 10 and
The folded airbag 10 is wrapped with a breakable wrapping sheet 32 (see FIG. 5) so as not to collapse. When the airbag 10 is folded, the gas inlet 12 is formed so that the lower portion 10b side of the airbag 10 can easily extend from the upper surface 1a to the rear surface 1b of the instrument panel 1 during inflation and deployment.
The rear side is lengthened, and the portion is folded by reverse roll folding around the lower surface side (see FIG. 5).

The inflator 34 is housed in the lower chamber 41 of the case 36 and the retainer 3
1 so that each of the bolts 31a of the first airbag 1 protrudes from each of the bottom walls 39 of the case 36.
7, the side wall portion 49 of the airbag cover 47 is externally provided in the upper chamber 37 from above, and the locking projections 38 of the peripheral wall portion 38 are provided in the respective locking holes 49 a of the side wall portion 49.
Insert a.

Next, the upper end of each vertical plate portion 45b is inserted into the locking projection 38a protruding from the side wall portion 49, and the bolt 31a is inserted through each horizontal plate portion 45a, thereby pressing the upper and lower portions of the case 36. Arrange the plates 45, 45,
Furthermore, if the nut 31b is screwed to each bolt 31a, the airbag device M1 can be assembled.

The passenger-side airbag device M1 assembled as described above is inserted through the opening 2 of the instrument panel 1 assembled to the vehicle to lock the locking legs 48c with the flange portion 3, and If the bolt 36 is screwed into the nut 43a via the bracket 5b, and the case 36 is connected to the body 5, it can be mounted on a vehicle.

If the inflation gas is discharged from the inflator 34 after the airbag device M1 is mounted on the vehicle, the airbag 10 is inflated to break the wrapping sheet 32 and break the airbag cover 47. Part 48
b is broken to open the doors 48a as shown by the two-dot chain lines in FIGS.
, It greatly protrudes.

And, in the airbag 10 of the embodiment,
Due to the rectifying cloth 20 arranged in the left-right direction of the vehicle so as to cover the gas inlet 12, a substantially intermediate portion C in the front-rear direction of the rectifying cloth 20 facing the vicinity of the center of the gas inlet 12 during deployment and inflation.
Since the flow rate of the inflation gas Gb flowing to the rear side is larger than the flow rate of the inflation gas Ga flowing to the front side, the lower side 1 of the airbag 10 as shown in FIGS.
0b extends from the upper surface 1a of the instrument panel 1 along the rear surface 1b.

Therefore, in the passenger-seat airbag 10 of the present embodiment, the instrument panel 1 can be quickly deployed along the passenger-seat-side surfaces 1a and 1b of the instrument panel 1 at the initial stage of deployment and inflation.
Of course, although the inflation gas Ga is smaller than the flow rate of the inflation gas Gb, it flows from the straightening cloth 20 to the front side (in the case of the embodiment, the front upper side on both the left and right sides). The side moves rearward along the windshield W, and immediately before the inflation is completed, the occupant-side surface 10c is arranged in a substantially vertical direction.

In particular, in the airbag 10 of the embodiment, the rectifying cloth 20 has the front and left and right sides other than the rear edge 20b except for the gas flow holes 25 and 26 near the left and right edges 20c and 20d on the front edge 20a side. Are joined to the first base cloth 16 of the airbag body 11.
Therefore, in the initial stage of the expansion and inflation, the rectifying cloth 20 is first inflated in a bag shape, and then a large amount of the inflation gas Gb is
Flows toward the lower portion 10b of the airbag 10. At this time, as shown in FIG. 6, when the rectifying cloth 20 is inflated in a bag shape, the airbag cover 4 covering the folded airbag 10 is formed.
8 can smoothly open the door portion 48a.
In this state, a large amount of the inflation gas Gb
As shown in FIG. 7, the airbag lower portion 10b further extends from the upper surface 1a of the instrument panel 1 along the rear surface 1b.
At the initial stage of deployment and expansion, surfaces 1a and 1b on the passenger seat side of instrument panel 1
Along the way, it can be deployed more quickly.

The flow of the inflation gas Ga · Gb in the airbag 10 according to the first embodiment will be described. When the inflation gas G is discharged from the inflator 34, the rectifying cloth 20 causes the inflowing inflation gas G to flow. G, which are separated from the gas inlet 12 by being pressed by the G and are connected to the gas flow holes 25 and 26 near the left and right sides of the front edge 20a, and thin gas channels RFL and RFR.
Three flow paths RFL, RFR, and RB branched into a three-pronged shape with a thick gas flow path RB connected to the trailing edge 20b side are formed (see FIG. 2). Then, the inflation gas Gb that has flowed through the gas flow path RB flows rearward along the passenger seat side surfaces 1a and 1b of the instrument panel 1, and the inflation gas Gb that has flowed through the gas flow paths RFL and RFR. Ga flows obliquely upward and forward outward in the left-right direction, respectively.

Further, in the airbag 10 of the embodiment,
The forward movement of the trailing edge 20b of the rectifying cloth 20 is regulated by the connecting belt 29 connected to the peripheral edge of the gas inlet 12, so that when the inflation gas G flows in, the rectifying cloth 20
However, the gas inlet 12 is turned up and the airbag body 1 is turned up.
It is possible to avoid the state of opening directly in 1,
The flow rate of the inflation gas Gb flowing to the rear side can be stably increased from the flow rate of the inflation gas Ga flowing to the front side.

As shown in FIGS. 9 to 12, the airbag 50 of the airbag device M2 according to the second embodiment includes a substantially rectangular rectifying cloth 60 similar to that of the first embodiment and a front edge 60a and both left and right sides. The entire length of the edges 60c and 60d is adjusted using the suture thread 18 to the first length of the airbag body 11 having the gas inlet 12.
It is joined to the base cloth 16. A gas that opens in a circular shape on the left and right sides 60c and 60d near the front edge 60a of the rectifying cloth 60 itself and that can pass the inflation gas Ga flowing forward with respect to the substantially middle portion C of the rectifying cloth 60. Flow holes 65 and 66 are provided. Further, a gas flow hole 67 is formed between the trailing edge 60b of the straightening cloth and the base cloth 16 so as to allow the inflation gas Gb flowing rearward with respect to the substantially middle part C as a reference.

Of course, when the airbag 10 is deployed and inflated, the inflation gas Ga.
Regarding the flow rate of Gb, the opening area of each gas flow hole 65, 66, 67 is set such that the flow rate passing through the gas flow hole 67 is larger than the total value of the flow rate passing through the gas flow holes 65, 66. ing. Furthermore, in the case of the embodiment, the flow rates of the inflation gas Ga passing through the gas circulation holes 65 and 66 are set to be substantially equal.

In the airbag 50, the rectifier 6
Between the vicinity of the center of the rear edge 60b and the rear edge 13b side of the opening peripheral edge 13 in the first base cloth 16 of the airbag body 11, a connection belt 29 for connecting the connection belts is provided.

The manufacture and mounting of the airbag 50 on a vehicle is the same as that of the first embodiment. If the inflation gas G flows from the gas inlet 12 after mounting on the vehicle, the rectifying cloth 60 However, except for the gas circulation holes 65 and 66 near the left and right sides on the front edge 60a side, the three-way joint 6 except for the rear edge 60b is provided.
Since 1.62 and 63 are joined to the first base cloth 16 of the airbag body 11, at the initial stage of deployment and inflation, first, as shown in FIG. Next, as shown in FIGS.
A large amount of inflation gas Gb flows from the gas flow hole 67 on the trailing edge 60b side of the airbag 50 toward the lower portion 50b of the airbag 50. Then, as shown in FIG. 12, when the rectifying cloth 60 is inflated into a bag shape, the door portion 48a of the airbag cover 48 covering the folded airbag 50 can be smoothly opened, and then the state is established. And a large amount of inflation gas Gb
Flows toward the lower part of the airbag 50b, the lower part of the airbag 50b further extends from the upper surface 1a to the rear surface 1b of the instrument panel 1, and as a result,
At the initial stage of deployment and expansion, surfaces 1a and 1b on the passenger seat side of instrument panel 1
Along the way, it can be deployed more quickly.

In particular, in the case of the second embodiment, the trailing edge 60
Since the three edges 60a, 60c, and 60d other than "b" are formed as joints 61, 62, and 63 over the entire length thereof, the bag-like expansion of the rectifying cloth 60 can be performed quickly and more smoothly.
a.48a can be opened.

Further, since the connecting belt 29 connects the straightening cloth 60 and the base cloth 16, the trailing edge 60b of the straightening cloth is not turned forward, and the flow rate of the inflation gas Gb flowing to the rear side is stabilized. , The flow rate of the expansion gas Ga flowing forward can be increased.

The flow of the inflation gas Ga · Gb in the airbag 50 according to the second embodiment will be described.
Like the airbag 10 of the embodiment, the inflator 3
When the inflation gas G is discharged from the gas inlet 4, the straightening cloth 60 is pushed by the inflowing inflation gas G and separates from the gas inlet 12, and the gas flow holes 65 and 66 near the left and right sides of the front edge 60a.
Gas passages RFL / RFR leading to the trailing edge 60b
The three gas passages RFL, RFR, and RB branched in a three-pronged manner with the thick gas passage RB connected to the side (FIG. 10)
reference). The expansion gas Gb flowing through the gas flow path RB
Flows along the front passenger seat side surfaces 1a and 1b of the instrument panel 1, and the inflation gases Ga and Ga flowing through the gas flow paths RFL and RFR are respectively obliquely upward and outward in the left-right direction. It will flow in the direction.

As shown in FIGS. 15 to 18, the airbag 70 of the airbag device M3 of the third embodiment has a substantially rectangular rectifying cloth 80 similar to that of the first and second embodiments.
The flow rate of the inflation gas Gb flowing to the rear side with respect to the substantially middle portion C in the front-rear direction of
The flow rate is set to be larger than the flow rate a.

In the case of the embodiment, the rectifying cloth 80 is
With the front edge 80a and the rear edge 80b not joined to the first base fabric 16 of the airbag body 11, both edges 80
c and 80d are arranged as joining portions 82 and 83 that are joined to the opening peripheral edge 13 over the entire length by using the suture thread 18, and further, on the left and right sides 80 c and 80 d on the rear edge 80 b side of the rectifying cloth 80 itself, The gas circulation holes 88 and 89, each having a circular opening and capable of passing the inflation gas Gb,
It is arranged. Leading edge 80a of straightening cloth 80 and first base cloth 1
6, the gas flow holes 86 through which the inflation gas Ga flows, and the space between the trailing edge 80b and the first base fabric 16 is the inflation gas G.
It becomes a gas flow hole 87 through which b flows. In the case of the embodiment, the opening areas of the gas circulation holes 88 and 89 are set substantially equal.

In the airbag 70, the rectifier 8
A connection belt 29 is provided between the vicinity of the center of the rear edge 80b and the rear edge 13b side of the opening edge 13 in the first base cloth 16 of the airbag body 11.

The manufacture and mounting of the airbag 70 on a vehicle is the same as in the first and second embodiments. If the inflation gas G flows from the gas inlet 12 after mounting on the vehicle, the gas The straightening cloth 80 arranged in the left-right direction of the vehicle so as to cover the inlet 12 allows the gas inlet 12
Since the flow rate of the inflation gas Gb flowing to the rear side is larger than the flow rate of the inflation gas Ga flowing to the front side on the basis of the substantially middle portion C in the front-rear direction of the straightening cloth 80 facing the vicinity of the center of FIG. As shown in 18 to 20, the lower side 80b of the airbag 80 extends from the upper surface 1a of the instrument panel 1 to the rear surface 1b.

Therefore, in the passenger seat airbag 70 of the embodiment, it is possible to quickly deploy the instrument panel 1 along the passenger seat side surfaces 1a and 1b at the initial stage of deployment and inflation.
Of course, although the inflation gas Ga is smaller than the flow rate of the inflation gas Gb, it flows from the straightening cloth 80 to the front side (the front upper side in the case of the embodiment). It moves rearward along the windshield W, and immediately before the inflation is completed, the occupant-side surface 70c is arranged in a substantially vertical direction.

In particular, since the gas flow holes 88 and 89 through which the inflation gas Gb can pass are provided on both the left and right edges 80c and 80d on the rear edge 80b of the rectifying cloth 80 itself, the air is expanded and expanded. Initially, the lower part 7 of the airbag 70
When the 0b side is extended from the upper surface 1a of the instrument panel 1 along the rear surface 1b by the inflation gas Gb flowing through the gas flow holes 88 and 89 on both the left and right sides to the rear side outward in the left and right direction, Can be expanded and expanded.

Since the connecting belt 29 connects the straightening cloth 80 and the base cloth 16, the trailing edge 80b of the straightening cloth does not turn forward, and the flow rate of the inflation gas Gb flowing to the rear side is stabilized. , The flow rate of the expansion gas Ga flowing forward can be increased.

The airbags 10, 50, and 70 of the first, second, and third embodiments can be manufactured into a three-dimensional shape by a two-dimensional sewing operation, but the fourth embodiment shown in FIGS. Three-dimensional airbag body 111 having a substantially rectangular tube shape, such as airbags 110, 150, and 170 of the sixth to sixth embodiments.
The rectifying cloths 20, 60, 80 may be disposed on the rim. In addition,
The airbag body 111 has two small base fabrics 116 and 116 forming left and right side walls, and one large base fabric forming a ceiling wall, a front side wall, and a rear side wall facing the gas inlet 112. And three cloths 117. In addition,
The opening periphery 113 of the gas inlet 112 extends from at least one of the small base cloth 116 and the large base cloth 117.

The airbag 110 of the fourth embodiment
Then, as shown in FIGS. 21 and 22, the rectifying cloth 20 similar to the first embodiment does not join the trailing edge 20 b of the rectifying cloth 20 to the large base cloth 117 of the airbag main body 111, and the left-right direction The two edges 20c and 20d and the front edge 20a are connected to each other by using the suture 18 to form a large base cloth 117 or a small base cloth 11 around the gas inlet 112 on the inner peripheral surface of the airbag body 111.
6 and 116.

This airbag 110 can also provide the same functions and effects as those of the first embodiment.

In the airbag 150 of the fifth embodiment, as shown in FIGS. 23 and 24, a rectifying cloth 60 similar to that of the second embodiment comprises a front edge 60a excluding a rear edge 60b and left and right edges 6a.
The entire length of Oc · 60d is attached to the peripheral edge of the gas inlet 112 on the inner peripheral surface of the airbag main body 111 by using the suture 18. And the rectifying cloth 6
0, on the left and right sides 60c and 60d near the front edge 60a,
Gas circulation holes 65 and 66 each having a circular opening and allowing the inflation gas to pass therethrough are provided.

The same operation and effect as in the second embodiment can be obtained with this airbag 150.

In the airbag 170 of the sixth embodiment, as shown in FIGS. 25 and 26, the rectifying cloth 80 similar to the third embodiment does not join the front edge 80a and the rear edge 80b to the airbag body 111. In the state, the left and right edges 80c
80d is arranged by using the suture 18 to be joined to the peripheral edge of the gas inlet 112 on the inner peripheral surface of the airbag main body 111 over the entire length. And the rectifying cloth 8
0, the left and right sides 80c and 80d on the trailing edge 80b side
In addition, gas circulation holes 88 and 89 each having a circular opening and allowing the inflation gas to pass therethrough are provided.

The same operation and effect as in the third embodiment can be obtained also in the airbag 170.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which an airbag according to a first embodiment of the present invention is inflated by itself.

FIG. 2 is a diagram showing a gas inlet side from the inside in a state where the airbag according to the embodiment is inflated by itself.

FIG. 3 is a longitudinal cross-sectional view in a front-rear direction in a state where the airbag of the embodiment is inflated by itself.

FIG. 4 is a diagram illustrating a sewing process of the airbag body in the airbag according to the embodiment.

FIG. 5 is a cross-sectional view showing a usage mode of a passenger airbag apparatus in which the airbag of the embodiment is used.

FIG. 6 is a diagram illustrating an inflated state of the airbag according to the embodiment.

FIG. 7 is a view for explaining an inflated state of the airbag of the embodiment, and shows a state after FIG.

FIG. 8 is a view for explaining an inflated state of the airbag of the embodiment, and shows a state after FIG. 7;

FIG. 9 is a perspective view showing a state where the airbag of the second embodiment is inflated by itself.

FIG. 10 is a view of the airbag of the embodiment as viewed from the gas inlet side from the inside in a state where the airbag is inflated by itself.

FIG. 11 is a longitudinal cross-sectional view in the front-rear direction in a state where the airbag of the embodiment is inflated by itself.

FIG. 12 is a diagram illustrating an inflated state of the airbag of the embodiment.

FIG. 13 is a view for explaining an inflated state of the airbag of the embodiment, and shows a state after FIG.

FIG. 14 is a view for explaining an inflated state of the airbag of the embodiment, and shows a state after FIG.

FIG. 15 is a perspective view showing a state where the airbag of the third embodiment is inflated by itself.

FIG. 16 is a view of a gas inlet side seen from the inside in a state where the airbag of the embodiment is inflated by itself.

FIG. 17 is a longitudinal sectional view in the front-rear direction in a state where the airbag of the embodiment is inflated by itself.

FIG. 18 is a diagram illustrating an inflated state of the airbag of the embodiment.

FIG. 19 is a view for explaining an inflated state of the airbag of the embodiment, and shows a state after FIG. 18;

FIG. 20 is a view for explaining an inflated state of the airbag of the embodiment, and shows a state after FIG. 19;

FIG. 21 is a perspective view showing a state in which the airbag of the fourth embodiment is inflated by itself.

FIG. 22 is a view of a gas inlet side seen from the inside in a state where the airbag of the embodiment is inflated by itself.

FIG. 23 is a perspective view showing a state where the airbag of the fifth embodiment is inflated by itself.

FIG. 24 is a view of the airbag of the embodiment as viewed from the gas inlet side from the inside when the airbag is inflated by itself.

FIG. 25 is a perspective view showing a state in which the airbag of the sixth embodiment is inflated by itself.

FIG. 26 is a diagram of the airbag of the same embodiment as viewed from the gas inlet side from the inside in a state in which the airbag is inflated by itself.

[Explanation of symbols]

1 (Instrument panel) Instrument panel, 10, 50, 70, 110, 150, 170: Airbag, 11, 111: Airbag body, 20, 60, 80: Rectifying cloth, 20a, 60a, 80a: Front edge, 20b / 60b / 80b: trailing edge, 20c / 60c / 80c: left edge, 20d / 60d / 80d: right edge, 25/26/65/66/88/89: gas flow hole, 29: connecting belt, G ... Inflation gas, M1, M2, M3 ... Airbag device for passenger seat.

Claims (4)

[Claims] An airbag device for a passenger seat disposed on an upper surface side of an instrument panel in front of a passenger seat has a gas inlet disposed substantially along a horizontal plane, and the gas inlet is provided with the gas inlet. An airbag for a passenger seat, wherein a rectifying cloth for changing a flow of inflowing inflation gas is disposed inside the airbag body, wherein the rectifying cloth moves the gas inlet into a left-right direction of a vehicle. And is arranged so that the flow rate of the inflation gas flowing to the rear side is larger than the flow rate of the inflation gas flowing to the front side on the basis of a substantially intermediate portion in the front-rear direction. An airbag for a passenger seat, characterized in that: 2. The rectifying cloth so that a flow rate of the inflating gas flowing rearward with respect to a substantially middle portion in the front-rear direction of the rectifying cloth is larger than a flow rate of the expanding gas flowing forward. In a state where the leading edge and the trailing edge are not joined to the airbag body, both edges in the left-right direction are joined to the periphery of the gas inlet on the inner peripheral surface of the airbag body, and are arranged. The airbag for a passenger seat according to claim 1, wherein gas flow holes through which the inflation gas can pass are provided on both left and right sides of a rear edge side of the rectifying cloth itself. 3. The rectifying cloth is configured such that a flow rate of the inflating gas flowing forward with respect to a substantially intermediate portion in the front-rear direction of the rectifying cloth is smaller than a flow rate of the expanding gas flowing backward. In a state where the rear edge is not joined to the airbag body, both left and right edges and the front edge are joined to the periphery of the gas inlet on the inner peripheral surface of the airbag body,
The inflating gas can be disposed between the left and right edges near the front edge of the rectifying cloth and the airbag body, or near the left and right sides near the front edge of the rectifying cloth itself. 2. A gas distribution hole is provided.
An airbag for a passenger seat according to the item. 4. A connecting belt is provided so that a trailing edge of the rectifying cloth can regulate forward movement when inflation gas flows.
The passenger airbag according to any one of claims 1 to 3, wherein the airbag body is connected to a trailing edge side of a peripheral edge of the gas inlet.