Airbag device for passenger seat and method for manufacturing airbag device for passenger seat

Abstract

Provided is a passenger seat airbag device that can effectively restrain an occupant while maintaining a self-standing posture on a dashboard. An airbag cushion (108) of the passenger seat airbag device (100) expands and deploys while being grounded to a vehicle dashboard (102). The airbag cushion (108) comprises: a pair of side panels (120), and a strip-shaped main panel (118) that connects the edges of the pair of side panels (120) to each other. The side panel (120) comprises an acute angle portion (128) that extends forward in an acute angle shape. The airbag cushion (108) further comprises: an inner seam allowance portion (148) joined to the edge of the main panel (118) and the edge of the side panel (120) in a state of being bent inwardly of the airbag cushion (108); and an outer seam allowance portion (144) joined to the end portions (138a, 138b) of the main panel (118) in a state of extending further forward from the acute angle portions (128) of a pair of side panels (120).

Description

Technical Field

[0001] The present invention relates to an airbag device for a passenger seat having an airbag cushion that inflates and deploys between an instrument panel of a vehicle and an occupant on a passenger seat, and a method for manufacturing the airbag device for a passenger seat. Background Art

[0002] In recent years, most vehicles are equipped with airbags as standard. Airbags are safety devices that operate in emergency situations such as vehicle collisions, and use air pressure to expand and deploy airbag cushions to catch passengers for protection. There are many types of airbags depending on the installation location and purpose. For example, the driver's seat has a front airbag installed in the center of the steering wheel, and the front passenger seat has a passenger airbag installed on the dashboard and its surrounding areas.

[0003] In order to effectively restrain the occupant, the airbag cushions of various airbag devices are designed in shape according to surrounding structures, etc. For example, the airbag 1 described in Patent Document 1 is an airbag for a passenger seat, and its structure is such that the front inflation portion 11 is pressed and contacted by the instrument panel 1 and the windshield W so as to be able to stand on the instrument panel 1 by itself.

[0004] Prior art literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-144201 Summary of the invention

[0006] In cited document 1, the front end portion B of the bottom portion 11a of the front inflation portion 11 can be formed into an arc shape, see paragraph 0036. However, depending on the size of the arc shape of the front end portion B, it is possible to affect the maintenance of the self-standing posture of the airbag 1. For example, if the radius of curvature of the arc shape of the front end portion B is large, the front surface portion 11b also protrudes significantly toward the windshield W, resulting in a strong interference of the front surface portion 11b with the windshield W. In this case, the front inflation portion 11 may interfere with the windshield W and bounce up, and the bottom portion 11a may float up from the instrument panel I, making it difficult for the airbag 1 to obtain a reaction force from the instrument panel I, and the front surface portion 11b may be recessed inwardly folded, making it difficult to absorb the load from the occupant.

[0007] Problem that the invention aims to solve

[0008] In view of the above problems, an object of the present invention is to provide an airbag device for a passenger's seat that can maintain a self-standing posture on an instrument panel and effectively restrain an occupant, and a method for manufacturing the airbag device for a passenger's seat.

[0009] Solutions to the problem

[0010] In order to solve the above-mentioned problems, the representative structure of the passenger seat airbag device involved in the present invention includes: an airbag cushion, which is inflated and deployed above the instrument panel and between the instrument panel and the passenger seat in a state of being grounded to the upper surface of the vehicle instrument panel; an inflator, which is fixed on the inner side of the instrument panel to supply gas to the airbag cushion, characterized in that the airbag cushion has: a pair of side panels, which form the side portions of the airbag cushion on both sides in the vehicle width direction; and a strip-shaped main panel, which connects the edges of the pair of side panels to each other, the pair of side panels having acute angles extending toward the front of the vehicle along the upper surface of the instrument panel. The airbag cushion also has: an inner seam allowance portion joined by the edge of the main panel and the edge of the pair of side panels in a state of being bent toward the inside of the airbag cushion; and an outer seam allowance portion joined by the end portions on both sides in the length direction of the main panel in a state of being further extended from the acute angles of the pair of side panels toward the front of the vehicle.

[0011] According to the above structure, the airbag cushion contacts the upper surface of the instrument panel through the strip-shaped main panel. In particular, in the front expansion portion of the airbag cushion formed by the acute angle portion of the side panel, the outer seam margin portion of the main panel is formed to extend further forward from the front end, so the front end is not easily rolled up. By effectively forming the tapered front expansion portion in the airbag cushion in this way, the airbag cushion can preferably enter between the instrument panel and the windshield and be grounded on the instrument panel, and the self-standing posture of the airbag cushion can be maintained.

[0012] The airbag cushion is provided with a front expansion portion, which includes a pair of acute angles of the side panels and expands along the upper surface of the instrument panel to protrude in a wedge shape toward the front of the vehicle, and the outer seam margin portion can be in a state of extending from the front end of the front expansion portion. According to the wedge-shaped front expansion portion, since the front end is formed as the outer seam margin portion, it is not easy to roll up, and can be preferably inserted between the instrument panel and the windshield, and can contact the instrument panel with a flat surface, so that the airbag cushion can maintain a self-standing posture.

[0013] The main panel may have a through hole formed in a portion contacting the upper surface of the instrument panel and connected to the inflator with a portion of the inflator inserted therein. By connecting the through hole of the main panel to the inflator fixed to the inner side of the instrument panel, the airbag cushion may be effectively grounded on the upper surface of the instrument panel.

[0014] The airbag cushion may further include a diffuser, which is arranged around the through hole of the main panel inside the airbag cushion and covers the inflator and guides the gas in a predetermined direction. By installing the diffuser, the airbag cushion can be effectively inflated and deployed.

[0015] The upper edges of the pair of side panels may extend in a substantially straight line. This structure can prevent the airbag cushion from excessively protruding toward the windshield when inflating and deploying, and can smoothly insert the front inflatable portion of the airbag cushion between the windshield and the instrument panel.

[0016] The upper edges of the pair of side panels may be bent downward and recessed. According to this structure, the airbag cushion can be prevented from excessively protruding toward the windshield when inflating and deploying, and the front inflatable portion of the airbag cushion can be smoothly inserted between the windshield and the instrument panel.

[0017] The pair of side panels may also have a front area including an acute angle portion and located above the instrument panel; a restraint area located between the instrument panel and the occupant and extending to below the front area; and a recess formed at a boundary between the front area and the restraint area in the lower edge of the pair of side panels and bent upward and recessed.

[0018] According to the above configuration, when the occupant contacts the airbag cushion, the airbag cushion is bent at an angle corresponding to the entry direction of the occupant starting from the recessed portion of the side panel, thereby being able to better restrain the occupant.

[0019] A representative structure of the manufacturing method of the front passenger seat airbag device involved in the present invention is a manufacturing method of the front passenger seat airbag device having an airbag cushion, which inflates and deploys above the instrument panel and between the instrument panel and the passenger in the front passenger seat in a state of being grounded to the upper surface of the vehicle instrument panel, and is characterized in that it comprises: a process of manufacturing a pair of side panels having an acute angle portion extending toward the front of the vehicle along the upper surface of the instrument panel in an acute angle shape; a process of connecting the edges of the pair of side panels to each other using a strip-shaped main panel, and extending the ends of the main panels on both sides in the length direction from the acute angle portion of the pair of side panels further toward the front of the vehicle and overlapping them up and down; a process of turning the airbag cushion inside out through the opening between the ends of the main panels; and a process of joining the ends of the main panels to each other.

[0020] The passenger airbag device having the above-mentioned functions and effects can be manufactured by the manufacturing method. That is, according to the manufacturing method, a passenger airbag device having an airbag cushion that can better maintain a self-standing posture and effectively restrain an occupant can be manufactured.

[0021] Effects of the Invention

[0022] According to the present invention, it is possible to provide an airbag device for a passenger's seat that can maintain a self-standing posture on an instrument panel and effectively restrain an occupant, and a method for manufacturing the airbag device for a passenger's seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a diagram showing an outline of the airbag device for a passenger's seat according to the embodiment of the present invention.

[0024] Figure 2 yes Figure 1 (b) is a schematic cross-sectional view taken along line AA of the airbag cushion.

[0025] Figure 3 It is shown Figure 2 FIG. 1 is a schematic diagram of an airbag cushion.

[0026] Figure 4 yes Figure 3 (a) is an enlarged view of the front inflation portion of the airbag cushion.

[0027] Figure 5 yes Figure 4 (b) Various cross-sectional views of the front expansion portion.

[0028] Figure 6 yes Figure 3 (b) A modified example of the side panel. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, other specific values, etc. shown in the embodiments are only examples for facilitating the understanding of the invention and do not limit the present invention unless otherwise specified. In addition, in this specification and the accompanying drawings, for elements having substantially the same function and structure, repeated descriptions are omitted by assigning the same symbols, and illustrations of elements that are not directly related to the present invention are omitted.

[0030] (Passenger seat airbag device)

[0031] Figure 1 1 is a diagram schematically showing a passenger-seat airbag device 100 according to an embodiment of the present invention. Figure 1 (a) is a diagram showing a vehicle before the passenger airbag device 100 is activated. Figure 1 In the figure (a), arrows F (Forward) and B (Back) respectively indicate the front and rear directions of the vehicle, arrows L (Left) and R (Right) respectively indicate the left and right directions of the vehicle width, and arrows U (up) and D (down) respectively indicate the up and down directions of the vehicle.

[0032] In this embodiment, the passenger airbag device 100 is described as a passenger airbag for the passenger seat, i.e., the front right seat 104, in a left-hand steering wheel vehicle. In the following description, since the front right seat 104 is assumed, for example, the vehicle outer side in the vehicle width direction refers to the vehicle right side, and the vehicle inner side in the vehicle width direction refers to the vehicle left side. In addition, the upper side refers to the passenger 114 who is properly seated on the seat 104 (see FIG. 1 ). Figure 2 )’s head direction, and downward refers to the direction of the lower limbs of the occupant 114.

[0033] The airbag cushion 108 of the passenger seat airbag device 100 (see Figure 1 (b)) is stored in a storage portion 106 provided in an instrument panel 102 of the vehicle. The storage portion 106 is provided in the vehicle front of the seat 104 and stores an inflator 110 as a gas generating device in addition to the airbag cushion 108. Figure 2 .

[0034] Figure 1 (b) is shown Figure 1 (a) is a diagram of a vehicle after the passenger airbag device 100 is activated. The airbag cushion 108 is bag-shaped and is formed by laminating a plurality of base fabrics constituting the surface thereof and then sewing or bonding them together.

[0035] Figure 2 yes Figure 1 (b) is a schematic AA cross-sectional view of the airbag cushion 108. Figure 2 As shown, the airbag cushion 108 is inflated and deployed above the instrument panel 102 and between the instrument panel 102 and the occupant 114 on the seat 104 in a state of being grounded to the upper surface of the instrument panel 102 , thereby restraining the occupant 114 from the front of the vehicle.

[0036] A portion of an inflator 110 as a gas generating device is inserted inside the airbag cushion 108. The inflator 110 is fixed to the inner side of the instrument panel 102 using a stud (not shown), and is activated upon receiving an impact detection signal from a predetermined sensor, and supplies gas to the airbag cushion 108. The airbag cushion 108 begins to expand due to the gas from the inflator 110, and the cover 107 is ruptured by the expansion (see FIG. 1 ). Figure 1 (a)) and expands toward the seat 104.

[0037] In this embodiment, the inflator 110 is a disk type. Currently, the inflators widely used include: a type that is filled with a gas generating agent and burns to generate gas, a type that is filled with compressed gas and supplies gas without generating heat, or a type that is filled with a mixture of combustible gas and compressed gas, etc. Any type of inflator can be used as the inflator 110.

[0038] The diffuser 116 is a member for rectifying the gas from the inflator 110, and is provided inside the airbag cushion 108 so as to cover the inflator 110. The diffuser 116 has openings for passing gas at predetermined positions. By providing the diffuser 116, the airbag cushion 108 can be inflated and deployed efficiently.

[0039] Figure 3 It is shown Figure 2 FIG. 1 is a diagram schematically illustrating an airbag cushion 108 . Figure 3 (a) Yes Figure 2 1 is a perspective view of the airbag cushion 108 during inflating and deployment. The airbag cushion 108 is composed of a central main panel 118 and a pair of left and right side panels 120. The rear side of the airbag cushion 108 on the vehicle forms an occupant restraint portion 122 having a large vertical dimension.

[0040] The front expansion portion 124 of the airbag cushion 108 on the vehicle front side is arranged along the instrument panel 102 (see Figure 2 The front expansion portion 124 enters the space between the instrument panel 102 and the windshield 112 and contacts the upper surface 102a of the instrument panel 102, thereby maintaining the self-standing posture of the airbag cushion 108.

[0041] Figure 3 (b) is shown Figure 3 (a) is a diagram of a side panel 120. A pair of side panels 120 are provided in the airbag cushion 108 (see Figure 3 A) is provided in a symmetrical shape in the vehicle width direction (left and right), and forms the side portions of both sides of the airbag cushion 108 in the vehicle width direction.

[0042] The front area 126 of the side panel 120 is located on the instrument panel 102 (see Figure 2 ) above. The vehicle front side of the front side region 126 is formed as an acute angle portion 128, which forms the side portion of the wedge-shaped front expansion portion 124 in the vehicle width direction. The acute angle portion 128 extends toward the front of the vehicle at an acute angle along the upper surface 102a of the instrument panel 102.

[0043] The restraint area 130 in the side panel 120 is formed to form the airbag cushion 108 (refer to Figure 2 ) is located between the instrument panel 102 and the occupant 114 and extends to the bottom of the front area 126. The restraint area 130 is provided with a vent hole 132 for discharging gas from the interior of the airbag cushion 108.

[0044] In the side panel 120, the upper edge 134 extending from the front side region 126 and the restraint region 130 extends obliquely in a substantially straight line. Since the upper edge 134 of the side panel 120 is formed in a substantially straight line, the airbag cushion 108 (see Figure 2 ) when expanding and deploying, the front expansion portion 124 is excessively protruded and expanded toward the windshield 112. With this structure, the front expansion portion 124 can be smoothly inserted into the space between the windshield 112 and the instrument panel 102.

[0045] A concave portion 136 is formed at the junction of the front area 126 and the restraint area 130 in the lower edge 135 of the side panel 120. The concave portion 136 has an upwardly curved concave shape. The concave portion 136 is located at the instrument panel 102 (refer to FIG. 1 ) when the airbag cushion 108 is inflated and deployed. Figure 2 By providing the recessed portion 136, when the occupant 114 contacts the airbag cushion 108, the occupant restraining portion 122 of the airbag cushion 108 is bent to an angle corresponding to the forward direction of the occupant 114 to absorb the load, thereby better restraining the occupant 114.

[0046] Figure 3 (c) is shown Figure 3 (a) is a diagram of a main panel 118. The main panel 118 is formed in a long strip shape and has a pair of side panels 120 (see Figure 3 The ends 138a and 138b of the main panel 118 on both sides in the longitudinal direction gradually approach the front of the vehicle along the upper edge 134 and the lower edge 135 of the side panel 120, and then are joined to each other by sewing at a position extending from the front end of the acute angle portion 128 of the side panel 120 to form an outer seam allowance 144, see Figure 5 (a).

[0047] The main panel 118 is provided with a connection to the inflator 110 (refer to Figure 2 ). The through hole 140 is formed in a portion of the main panel 118 that contacts the upper surface 102a of the instrument panel 102. Bolt holes 142 for inserting studs of the inflator 110 are also provided around the through hole 140. The through hole 140 is connected to the inflator 110 in a state where a part of the inflator 110 is inserted by using the bolt holes 142 and the like.

[0048] By connecting the through hole 140 of the main panel 118 with the inflator 110 (see Figure 2) are fixed to the inner side of the instrument panel 102, the airbag cushion 108 can be effectively grounded on the upper surface 102a of the instrument panel 102. In addition, the diffuser 116 can also be arranged around the through hole 140 of the main panel 118 on the inner side of the airbag cushion 108 by sewing or the like.

[0049] Figure 4 yes Figure 3 (a) is an enlarged view of the front inflation portion 124 of the airbag cushion 108. Figure 4 (a) is shown from the left side in the vehicle width direction Figure 3 (a) The front expansion portion 124. An outer seam allowance portion 144 is formed at the front end of the front expansion portion 124. The outer seam allowance portion 144 is formed by connecting the end portions 138a, 138b (see Figure 5 (a)) A portion joined by upper and lower stitching. In a conventional airbag cushion, the seam allowance is formed on the inner side, but the front expansion portion 124 of the airbag cushion 108 is intentionally formed with an outer seam allowance portion 144 located on the outer side, so that the front end of the front expansion portion 124 is not easily rolled up and can be expanded and deployed at an acute angle.

[0050] Figure 4 (b) Observed from the front and above Figure 3 (b) is a perspective view of the front inflation portion 124 of the airbag cushion 108. The outer seam allowance portion 144 is formed by overlapping and joining the end portions 138a and 138b on both sides of the length direction of the main panel 118 in a state extending toward the front of the vehicle from the acute angle portion 128 of the pair of side panels 120. In this way, the outer seam allowance portion 144 is formed to extend in the vehicle width direction at the front end of the front inflation portion 124.

[0051] Figure 5 yes Figure 4 (b) is a cross-sectional view of the front expansion portion 124. Figure 5 (a) Yes Figure 4 (b) is a BB cross-sectional view of the front expansion portion 124. By providing the outer seam allowance 144, the front expansion portion 124 expands and expands into a wedge shape without rolling up. Therefore, the bottom surface 146 of the front expansion portion 124 is flatter and can be aligned with the instrument panel 102 (see Figure 2 ) is in contact with the upper surface 102a of the instrument panel 102 over a large area. As a result, the airbag cushion 108 can effectively stand on the instrument panel 102.

[0052] Figure 5 (b) Yes Figure 4(b) is a CC cross-sectional view of the front inflation portion 124. An inner seam allowance portion 148 is formed on a portion of the front inflation portion 124 except for the front end. The inner seam allowance portion 148 is formed by bending the edge of the main panel 118 and the edge of the side panel 120 toward the inside of the airbag cushion 108 and joining them. The inner seam allowance portion 148 is formed at all joints between the main panel 118 and the side panel 120. That is, in the airbag cushion 108, except for the outer seam allowance portion 144 at the front end of the front inflation portion 124, the seam allowance is formed on the inside, so that the seam allowance is configured not to contact the occupant 114 (refer to Figure 2 ) or other structures.

[0053] As described above, the front expansion portion 124 formed by the acute angle portion 128 of the side panel 120 and the end side of the main panel 118 is formed so that the outer seam allowance portion 144 of the end portions 138a, 138b of the main panel 118 is further extended forward from the front end, so that the front end of the front expansion portion 124 is not easily rolled up. Therefore, the front expansion portion 124 expands and expands into a wedge shape with a thinner front end. The front expansion portion 124 having such a shape can be better inserted into the instrument panel 102 (see Figure 2 ) and the windshield 112, and at the same time, a flat bottom surface 146 is formed (refer to Figure 5 (a)) and in surface contact with the instrument panel 102, so that the airbag cushion 108 can maintain a self-standing posture. As a result, the airbag cushion 108 can maintain a self-standing posture and effectively restrain the occupant 114.

[0054] (Manufacturing method of passenger airbag device)

[0055] Hereinafter, a method for manufacturing the airbag device 100 for a passenger's seat having the airbag cushion 108 described above will be described.

[0056] The manufacturing method first includes the steps of manufacturing a pair of side panels 120, referring to Figure 3 (b) The side panel 120 is manufactured to have an acute angle portion 128, which extends at an acute angle toward the front of the vehicle along the upper surface 102a of the instrument panel 102, as shown in FIG. Figure 2 .

[0057] In the subsequent process, the main panel 118 (see Figure 3 (c)) Connecting the edges of the pair of side panels 120. At this time, the ends 138a and 138b on both sides of the length direction of the main panel 118 are processed to extend from the acute angle 128 of the pair of side panels 120 toward the front of the vehicle, and become an upper and lower overlapping state.

[0058] Next, the outer seam allowance 144 (see Figure 4Before (b), an opening is made between the ends 138a and 138b of the main panel 118, and the airbag cushion 108 is turned inside out from the opening. By this process, the seam allowance when the side panel 120 and the main panel 118 are connected is located on the inner side of the airbag cushion 108, thereby forming an inner seam allowance portion 148, as shown in FIG. Figure 5 (b).

[0059] In forming the inner seam allowance 148 (refer to Figure 5 (b)) After that, a joining process such as sewing the ends 138a and 138b of the main panel 118 up and down is performed to form an outer seam allowance 144, see Figure 5 (b) Thus, the airbag cushion 108 having the wedge-shaped front inflation portion 124 and capable of maintaining a self-standing posture is manufactured.

[0060] The airbag cushion 108 manufactured by the above manufacturing method also helps to install the diffuser 116. Figure 2 Conventionally, after sewing the panel members, the through hole 140 of the inflator (see Figure 3 (c) Turning the airbag cushion inside out. However, in this method, when the diffuser 116 is set around the through hole 140, the diffuser 116 must be placed inside the airbag cushion after turning the airbag cushion inside out, and sewing and the like must be performed, so the setting work of the diffuser 116 is very laborious. On the other hand, according to this manufacturing method, the airbag cushion 108 is opened at the front end of the front inflation portion 124 and the airbag cushion 108 is turned inside out, and does not pass through the through hole 140 for the inflator. Therefore, the diffuser 116 can be set around the through hole 140 before turning it inside out. That is, according to this manufacturing method, the diffuser 116 can be easily pre-installed on the main panel 118.

[0061] Furthermore, according to the manufacturing method, the diffuser 116 can be set on the main panel 118 in a state where it is folded and temporarily stitched. Temporary stitching is stitching in which the stitching is released when a certain degree of force is applied, such as the thread breaking or splitting. By folding the diffuser 116 and temporarily stitching it, the position of the diffuser 116 can be prevented from shifting when the airbag cushion 108 is stored. And, when air pressure is applied, the temporary stitching is released and the diffuser 116 is unfolded, and the airbag cushion 108 can be smoothly inflated and unfolded by the gas rectifying effect of the diffuser 116. When setting such a diffuser 116 that has been temporarily stitched, the manufacturing method of performing the above-mentioned process of opening the front end of the front inflation portion 124 and turning the airbag cushion 108 over is very effective.

[0062] (Variation Example)

[0063] Hereinafter, modified examples of the above-mentioned components will be described. Figure 6 yes Figure 3 (b) is a modified example of the side panel 120, namely the side panel 200. Figure 6 In the following description, the same symbols are attached to the elements identical to the components already described, and the description of the components already described is omitted. In addition, in the following description, even if different symbols are given to the elements having the same names as the components already described, they all have the same functions unless otherwise specified.

[0064] In the side panel 200, the upper edge 202 is bent downward and recessed. Figure 2 ) when receiving gas, due to the pressure of the gas, it protrudes and expands in a rounded state to a certain extent toward the windshield 112. Therefore, if the side panel 200 is preliminarily bent and recessed in the upper edge 202, the rounded state of the airbag cushion 108 when inflated and deployed can be suppressed, and it can be prevented from protruding excessively toward the windshield 112. Therefore, by using the side panel 200, it is also possible to effectively form the wedge-shaped front expansion portion 124, and the front expansion portion 124 can be smoothly inserted into the space between the windshield 112 and the instrument panel 102.

[0065] The preferred embodiments of the present invention are described above with reference to the accompanying drawings. The above embodiments are preferred examples of the present invention, and other embodiments can also be implemented or practiced in various ways. Unless there is a special record of the subject matter in this specification, the present invention is not restricted by the shape, size and structural configuration of the detailed parts shown in the drawings. In addition, the expressions and terms used in this specification are for the purpose of explanation, and are not limited to this unless there is a special record of the subject matter.

[0066] Therefore, a person skilled in the art can conceive of various changes or modifications within the scope of the claims, and it is obvious that these should also fall within the technical scope of the present invention.

[0067] Industrial Applicability

[0068] The present invention can be used in an airbag device for a passenger seat having an airbag cushion that inflates and deploys between an instrument panel of a vehicle and an occupant in a passenger seat, and a method for manufacturing the airbag device for a passenger seat.

[0069] Explanation of symbols

[0070] 100 ... passenger airbag device, 102 ... instrument panel, 102a ... instrument panel upper surface, 102b ... instrument panel design surface, 104 ... seat 106 ... storage portion, 107 ... cover, 108 ... airbag cushion, 110 ... inflator, 112 ... windshield, 114 ... passenger, 116 ... diffuser, 118 ... main panel, 120 ... side panel, 122 ... passenger restraint portion, 124 ... front inflation portion, 126 ... front Side area, 128...acute angle portion, 130...restraint area, 132...exhaust hole 134...upper edge of side panel, 135...lower edge of side panel, 136...recess, 138a, 138b...ends of main panel, 140...through hole, 142...bolt hole, 144...outer seam allowance portion, 146...bottom surface of front expansion portion, 148...inner seam allowance portion, 200...side panel of modified example, 202...upper edge of side panel.

Claims

1. A passenger seat airbag device, comprising: an airbag cushion, which is grounded to the upper surface of a vehicle instrument panel and expands and deploys above the instrument panel and between the instrument panel and a passenger in the passenger seat; an inflator, which is fixed to the inner side of the instrument panel and supplies gas to the airbag cushion, characterized in that: The airbag cushion has: a pair of side panels forming side portions of the airbag cushion on both sides in the vehicle width direction; and a belt-shaped main panel disposed at the center of the airbag cushion and connecting the edges of the pair of side panels to each other, The pair of side panels has: a front area located above the instrument panel; a restraint area located between the instrument panel and the occupant and extending below the front area; a recessed portion formed at a boundary between the front side region and the restraint region in the lower edges of the pair of side panels and bent upward and recessed; as well as an acute angle portion, which is included in the front area and extends toward the front of the vehicle at an acute angle along the upper surface of the instrument panel, The main panel has a through hole formed at a portion in contact with an upper surface of the instrument panel and connected to the inflator in a state in which a part of the inflator is inserted, The airbag cushion has a front inflation portion and an occupant restraint portion, The front expansion portion is formed by including the acute angle portions of the pair of side panels and expands along the upper surface of the instrument panel to protrude in a wedge shape from the through hole of the main panel toward the front of the vehicle, thereby maintaining the self-standing posture of the airbag cushion. The occupant restraint portion is formed at a position closer to the rear of the vehicle than the through hole of the main panel, including the restraint region of the pair of side panels, and has a larger vertical dimension than other parts of the airbag cushion. The airbag cushion also has: Inner seam allowances formed by joining the edge of the main panel and the edge of the pair of side panels in a state of being bent inwardly of the airbag cushion; and The ends of both sides of the main panel in the longitudinal direction are overlapped and joined to each other in a state of extending further toward the front of the vehicle from the acute angle portions of the pair of side panels.

2. The passenger airbag device according to claim 1, wherein: The outer seam allowance portion is in a state of extending from a front end of the front inflation portion.

3. The passenger airbag device according to claim 1, wherein: The airbag cushion further includes a diffuser that is provided around the through hole of the main panel inside the airbag cushion, covers the inflator, and guides gas in a predetermined direction.

4. The passenger airbag device according to any one of claims 1 to 3, characterized in that: The upper edges of the pair of side panels extend in an approximately straight line shape.

5. The passenger airbag device according to any one of claims 1 to 3, characterized in that: The upper edges of the pair of side panels are bent downward and recessed.

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