Side airbag device

Abstract

Provided is a side airbag device capable of improving passenger protection performance. A side airbag device (100) is provided with a bag-shaped airbag cushion (118) that is provided to a side section of a seat back (106) of a seat (104) and that is inflated and deployed by gas supplied from an inflator (120). The airbag cushion (118) includes: a main chamber (124B) that is inflated and deployed at a side portion of the seat back (112); and a first sub-chamber (126B) that protrudes from the main chamber (124B) toward the seat back (112) side and that expands and deploys. The main chamber (124B) includes a protruding portion (166) that protrudes further upward than the first sub-chamber (126B). The airbag cushion (118) also includes a non-inflatable first panel (128B) straddled at an inner corner (174) between the bulge (166) and the first secondary chamber (126B).

Description

Technical Field

[0001] The present invention relates to a side airbag device including a bag-shaped airbag cushion that inflates and deploys toward the side of an occupant on a vehicle seat when a side collision of a vehicle occurs. Background Art

[0002] In recent years, most vehicles are equipped with airbag devices as standard. Airbag devices are safety devices that operate in emergency situations such as vehicle collisions, and use airbag cushions that expand and deploy using air pressure to catch passengers for protection. For example, side airbag devices include bag-shaped airbag cushions that expand and deploy toward the side of passengers on vehicle seats when the vehicle is in a side collision.

[0003] Generally, when a lateral impact is applied to a vehicle, the occupants move in the vehicle width direction. For example, when a side collision occurs, such as when another vehicle or an object such as a utility pole, i.e., a collision object, collides with the side of the vehicle on the passenger seat side, the side airbags that protect the occupants can be roughly divided into two types. The first is the so-called near-side airbag. The near-side airbag is inflated and deployed between the passenger seat and the side door to prevent the occupants on the side that contacts the collision object (near-side occupants, in this case, the occupants on the passenger seat side) from colliding with the side door. The second is the so-called far-side airbag, for example, Patent Document 1. The far-side airbag is inflated and deployed between the driver's seat and the passenger seat to protect the occupants (far-side occupants, in this case, the driver's side occupants) who move toward the center of the vehicle due to a lateral collision.

[0004] Patent document 1 discloses a vehicle safety device, which includes a distal airbag and a tension tether connected to the distal airbag. Both ends of the tension tether in the long-side direction are connected to the seat back frame, and when the distal airbag is in an inflated and deployed state, the tension tether extends upward from the vehicle outer side portion of the headrest in the upper end portion of the seat back frame, and further engages the headrest from the rear side of the seat. In addition, the tension tether extends from the upper surface of the headrest to the upper surface of the distal airbag, and further passes through the vehicle inner side of the distal airbag to extend to the seat back frame.

[0005] In Patent Document 1, the far side airbag is supported from the inside in the vehicle width direction by the tension tether, and when the far side airbag is inflated and deployed, the tension tether can be prevented from contacting the occupant, so that the deployment direction of the far side airbag can be stabilized.

[0006] Prior art literature

[0007] Patent Document 1: Japanese Patent Publication No. 2014-51138 Summary of the invention

[0008] Problem that the invention aims to solve

[0009] In the vehicle safety device of Patent Document 1, it is necessary to support the distal airbag from the inner side in the vehicle width direction by the tension tether and prevent the occupant from contacting the tension tether when the distal airbag is inflated and deployed. Therefore, the installation position of the tension tether is limited and the installation work is also time-consuming. In addition, when the distal airbag is inflated and deployed, if the tension tether deviates from the predetermined position, it is difficult to stabilize the deployment direction of the distal airbag.

[0010] In view of the above problems, an object of the present invention is to provide a side airbag device capable of improving occupant protection performance.

[0011] Solutions to the problem

[0012] In order to solve the above-mentioned problems, the typical structure of the side airbag device involved in the present invention is that it is a side airbag device equipped with a specified inflator and a bag-shaped airbag cushion, which is arranged on the side of the seat back of the vehicle seat and is inflated and expanded by the gas supplied from the inflator, and is characterized in that the airbag cushion includes: a main chamber, which is inflated and expanded at the side of the seat back; and a first sub-chamber, which protrudes from the main chamber to one side of the seat back and is inflated and expanded, the main chamber includes a bulge that bulges above the first sub-chamber when inflated and expanded, and the airbag cushion also includes a non-inflatable first sailboard spanning the inner corner between the bulge and the first sub-chamber.

[0013] According to the above structure, in the event of a collision, not only the main chamber and the first sub-chamber restrain the occupant from the side, but the first sailboard can also restrain the occupant's head at an early stage. In particular, the first sailboard can prevent the occupant's head from falling to the side and rotating, thereby suppressing the burden applied to the occupant's head and reducing the damage value to the occupant. Therefore, according to the above structure, a side airbag device with improved occupant protection performance can be provided.

[0014] The first sailboard may be provided to connect an upper end portion of the raised portion and a protruding front end portion of the first sub-chamber.

[0015] According to the above structure, the first sailboard can be preferably deployed between the raised portion and the first sub-chamber.

[0016] The airbag cushion may be arranged so that the raised portion is located on the side of the head of an occupant sitting on the vehicle seat, and when the main chamber and the first sub-chamber are inflated and deployed, the first sailboard is in a tensioned state on the side of the occupant's head.

[0017] According to the above structure, the head of the occupant can be preferably restrained by the first windsurfing board.

[0018] The airbag cushion may further include: a second sub-chamber that protrudes from the main chamber in a direction opposite to the first sub-chamber and expands and unfolds; and a second non-expandable sailboard that spans the inner corner between the raised portion and the second sub-chamber.

[0019] According to the above structure, the first and second sailboards apply tension to the raised portion from the left and right sides, thereby maintaining the shape of the raised portion and keeping the first sailboard in a tensioned state, and the head of the occupant can be better restrained by these raised portions and the first sailboard.

[0020] The second sailboard may be provided to connect an upper end portion of the raised portion and a protruding front end portion of the second sub-chamber.

[0021] According to the above structure, the second sailboard can be preferably deployed between the raised portion and the second sub-chamber.

[0022] The raised portion of the main chamber may protrude further forward when inflated and deployed than a portion located below the raised portion of the main chamber.

[0023] According to the above configuration, the head of the occupant and the like can be appropriately restrained in a wide range by the raised portion and the first sailboard connected to the raised portion.

[0024] Effects of the Invention

[0025] According to the present invention, a side airbag device capable of improving occupant protection performance can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a diagram showing an outline of a side airbag device according to an embodiment of the present invention.

[0027] Figure 2 It is shown from all directions Figure 1 Figure 1. Airbag cushion.

[0028] Figure 3 It is shown from the front Figure 1 Diagram of the relationship between the airbag cushion and each seat.

[0029] Figure 4 It is shown Figure 2 FIG. 1 is a diagram showing a modified example of an airbag cushion.

[0030] Figure 5 It is shown Figure 2 (b) is a diagram of another modified example of the airbag cushion. DETAILED DESCRIPTION

[0031] 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 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.

[0032] Figure 1 1 is a diagram showing the outline of a side airbag device 100 according to an embodiment of the present invention. Figure 1 The occupant 122 in the vehicle is seated in a normal posture on the vehicle seat 104. It is assumed that the seat 104 is a right front seat in the vehicle, such as a driver's seat, and includes a seat back 106 and a seat cushion 108 for the occupant 122 to sit on.

[0033] In the present embodiment, when the passenger 122 is seated in the seat 104 in a normal posture, the direction the passenger 122 is facing is referred to as the front, and the opposite direction is referred to as the rear. In addition, when the passenger 122 is seated in the seat 104 in a normal posture, the right side of the passenger 122 is referred to as the right direction, and the left side of the passenger 122 is referred to as the left direction. In addition, when the passenger 122 is seated in a normal posture, the direction of the passenger's 122 head is referred to as the top, and the direction of the passenger's 122 waist is referred to as the bottom. In addition, in the drawings used in the following description, the front, rear, left, right, up, and down directions based on the above-mentioned passenger are represented as Front, Back, Left, Right, Up, and Down as needed.

[0034] Generally speaking, vehicle seats are sometimes able to rotate in any direction. Therefore, the direction based on the occupant sitting on the above-mentioned seat 104 may be different from the direction based on the vehicle. In the present embodiment, the "up", "down", and "up-down" directions of the vehicle refer to the directions on the line connecting the center of the roof and the center of the floor of the vehicle, and the direction toward the ceiling is called "up", and the direction toward the floor is called "down". Regarding the "front", "back", and "front-to-back" directions of the vehicle, the forward direction of the vehicle is called the "front" direction, and the backward direction of the vehicle is called the "back" direction. In addition, the vehicle width direction is the direction in which ordinary seats are arranged side by side, and refers to the direction orthogonal to the above-mentioned "front-to-back" direction.

[0035] In addition, in the present embodiment, the seat opposite to the driver's seat is the passenger seat. The seat opposite to the passenger seat is the driver's seat. In other words, when the seat and the seat opposite to the seat are recorded, if the seat is the driver's seat, the seat opposite to the seat is the passenger seat. On the other hand, if the seat is the passenger seat, the seat opposite to the driver's seat is the driver's seat.

[0036] Figure 1 The occupant 122 in the figure is an example of a dummy used in a car collision test. Dummies that can be applied to the occupant 122 include, for example, AM50 and AF05 of the Hybrid III dummy for frontal collision. AM50 is a dummy that simulates a male, with a height of 175 cm and a weight of 78 kg, which is equivalent to 50% of the average size of an adult male in the United States. AF05 is a dummy that simulates a female, with a height of 145 cm, a sitting height of 79 cm, and a weight of about 45 kg, and is a female model with a petite physique.

[0037] In addition to the above-mentioned frontal collision dummy, a side collision dummy, a child dummy, a rear collision dummy, etc. can also be appropriately applied to the occupant 122. Each dummy is manufactured according to the standards of NHTSA (National Highway Traffic Safety Administration).

[0038] Figure 1 The side airbag device 100 shown may be built in each side of a seat back 106 of a seat 104. As an example, the side airbag device 110 of the present embodiment is assumed to be built in the seat 104 on the vehicle center side.

[0039] The side airbag device 100 has a structure in which a bag-shaped airbag cushion 118 is inflated and deployed from a seat 104 toward the side of an occupant 122. The airbag cushion 118 is inflated and deployed from an inflator 120 (see FIG. Figure 2 (a)) The gas supplied causes the surface of the seat back 106 to rupture and expand toward the side of the occupant 122 .

[0040] Figure 2 It is shown from all directions Figure 1 FIG. 118 of the airbag cushion 118 . Figure 2 (a) Yes Figure 1 1 is a perspective view of an airbag cushion 118 .

[0041] The airbag cushion 118 is formed into a bag by, for example, sewing a base fabric constituting the surface thereof on the front and back surfaces, or knitting using OPW (One-Piece Woven).

[0042] The inflatable portion of the airbag cushion 118 is roughly divided into a central main chamber 124B, a first sub-chamber 126B on the passenger side, and a second sub-chamber 126C on the opposite side. Figure 3 ) as observed, the airbag cushion 118 is arranged side by side in the left-right direction of the seat 104 in the order of the first sub-chamber 126B, the main chamber 124B, and the second sub-chamber 126C.

[0043] The main chamber 124B includes a base 168 and a raised portion 166 and extends toward the seat 104 (see FIG. Figure 1 ) is inflated and deployed on the side of the passenger 122. The base 168 is a portion forming the central range of the main chamber 124B. When the bulge 166 is inflated and deployed, it protrudes above the first sub-chamber 126B and the second sub-chamber 126C.

[0044] The first sub-chamber 126B extends from the base 168 of the main chamber 124B toward the occupant 122 (see Figure 1 The upper surface of the first sub-chamber 126B is a support portion 170, which can receive the head 142 of the occupant 122 when the head 142 of the occupant 122 is turned upside down.

[0045] The second sub-chamber 126C protrudes from the base 168 of the main chamber 124B in the direction opposite to the first sub-chamber 126B and expands. The upper surface of the second sub-chamber 126C is a support portion 172, which faces another seat 110 (see FIG. 1 ) to be described below. Figure 3 ) protrudes, and when the head of the occupant on the seat 110 is turned upside down, it can catch the head of the occupant

[0046] The airbag cushion 118 is a non-inflatable portion that is stretched like a sail, and includes a first sailboard 128B and a second sailboard 128C.

[0047] When the airbag cushion 118 is inflated and deployed, the first sailboard 128B is connected to the right side edge 178 extending in the front-rear direction along the upper surface of the bulge 166, and the right side edge 180 extending in the front-rear direction along the upper surface portion of the first sub-chamber 126B, i.e., the support portion 170. Thus, the airbag cushion 118 is in a state where the edge of the bulge 166 and the edge of the first sub-chamber 126B are connected to each other through the first sailboard 126B.

[0048] The first sailboard 128B is in a state of being straddling the inner corner 174 between the bulge 166 and the first sub-chamber 126B, that is, the corner formed by the right side surface 182 extending in the vertical direction on the right side in the left-right direction of the bulge 166 and the upper surface (support portion 170) extending in the left-right direction of the first sub-chamber 126B. As the bulge 166 and the first sub-chamber 126B expand and unfold, the first sailboard 128B is stretched between the bulge 166 and the first sub-chamber 126B.

[0049] like Figure 1 As shown, the unfolded first sailboard 128B forms a surface (which may include a flat surface or a curved surface) that is continuously connected in the front-rear direction by a straight line L1 connecting the right side edge 178 of the raised portion 166 and the right side edge 180 of the first sub-chamber 126B, and is in contact with the occupant 122 (see Figure 1 ) is opposite to the head 142 of the occupant 122 on the seat 104. This surface is an inclined surface that is inclined from the upper part of the ridge 166 toward the passenger side portion of the first sub-chamber 126B below. By forming this inclined surface, the first sailboard 128B can effectively receive the head 142 of the occupant 122 on the seat 104.

[0050] When the airbag cushion 118 is inflated and deployed, the second sailboard 128C is connected to the left side edge 184 extending in the front-rear direction of the upper surface of the bulge 166 and the left side edge 186 extending in the front-rear direction of the upper surface portion of the second sub-chamber 126C, that is, the support portion 172. Thus, the airbag cushion 118 is in a state where the edge of the bulge 166 and the edge of the second sub-chamber 126C are connected to each other through the second sailboard 126C.

[0051] The second sailboard 128C is in a state of being straddling the inner corner 176 between the raised portion 166 and the second sub-chamber 126C, that is, the corner formed by the left side surface 188 extending in the vertical direction on the left side in the horizontal direction of the raised portion 166 and the upper surface (support portion 172) extending in the horizontal direction in the second sub-chamber 126C. As the raised portion 166 and the second sub-chamber 126C expand and unfold, the second sailboard 128C is also stretched tight between the raised portion 166 and the second sub-chamber 126C.

[0052] The deployed second sailboard 128C forms a straight line L2 connecting the left edge 184 of the raised portion 166 and the left edge 186 of the second sub-chamber 126C (see Figure 1 ) is continuously connected and developed in the front-rear direction (may include a flat surface or a curved surface), and is connected to the seat 110 (refer to Figure 3 ) is opposite to the head of the occupant on the seat 110. This surface is an inclined surface that is inclined from the upper part of the ridge 166 toward the occupant side portion of the seat 110 in the second sub-chamber 126C below. By forming this inclined surface, the second sailboard 128C can effectively receive the head of the occupant on the seat 110.

[0053] Figure 2 (b) Observation from above Figure 1 The first sailboard 128B and the second sailboard 128C can be moved from the seat 104 (refer to Figure 1 ) is tightened on both sides in the width direction to support the posture of the raised portion 166. Thus, even if the raised portion 166 is subjected to a load from the head 142 of the occupant 122, the raised shape can be maintained, thereby better restraining the head 142, etc.

[0054] like Figure 1 As shown, the airbag cushion 118 is configured so that the raised portion 166 is located on the side of the head 142 of the occupant 122 on the seat 104. In addition, the first sailboard 128B is configured to be in a tensioned state on the side of the head 142 of the occupant 122 when the raised portion 166 of the main chamber 124B and the first sub-chamber 126B are inflated and deployed.

[0055] The first sailboard 128B is provided to connect the upper end of the raised portion 166 and the front end of the first sub-chamber 126B protruding toward the seat back 112. The first sailboard 128B is stretched and deployed between the raised portion 166 and the support portion 170 and is in a tensioned state, thereby forming a non-expandable plane between the raised portion 166 and the support portion 170. Thus, when the head 142 of the occupant 122 falls to the side, the airbag cushion 118 can catch the head 142 of the occupant 122 by the reaction force of the tensioned first sailboard 128B.

[0056] According to the above structure, when a collision occurs, not only the main chamber 124B and the first sub-chamber 126B restrain the occupant 122 from the side, but also the first sailboard 128B can restrain the head 142 of the occupant 122 earlier. In particular, the first sailboard 128B can prevent the head 142 of the occupant 122 from falling to the side and rotating, thereby suppressing the burden applied to the head 142 and reducing the damage value to the occupant 122. Therefore, according to the above structure, it is possible to provide a side airbag device 100 with improved protection performance for the occupant 122.

[0057] Figure 3 It is shown from the front Figure 1 FIG. 1 is a diagram showing the relationship between the airbag cushion 118 and each seat.

[0058] In the vehicle, another seat 110 is arranged adjacent to the seat 104. The seat 110 is a left front seat, such as a passenger seat, and includes a seat back 112 and a seat cushion (not shown). In addition, the side airbag device 100 is built not only in the side portion of the seat back of each seat on the vehicle center side, but also in the side portion on the side of the side door.

[0059] The second sailboard 128C is provided to connect the upper end of the raised portion 166 and the front end of the second sub-chamber 126C protruding toward the opposite side of the first sub-chamber 126B. In addition, the second sailboard 128C is stretched and unfolded between the raised portion 166 and the support portion 172, and is in a tensioned state, so that a non-expandable plane is formed between the raised portion 166 and the support portion 172. Therefore, when the head of the occupant of the other seat 110 falls to the side, the airbag cushion 118 can also catch the head of the occupant through the reaction force of the stretched second sailboard 128C.

[0060] By tightening the bulge 166 from the left and right sides by the first sailboard 128B and the second sailboard 128C, the shape of the bulge 166 can be maintained, and the first sailboard 128B and the second sailboard 128C can be maintained in a tightened state. Therefore, according to the airbag cushion 118, the bulge 166, the first sailboard 128B and the second sailboard 128C can be used to preferably restrain the head of the occupant on the seats 104 and 110.

[0061] As is well known, in a vehicle emergency, the angular velocity and angular acceleration of the occupant's head tend to increase the damage value to the brain. In this regard, in the airbag cushion 118 of the present embodiment, the first sailboard 128B and the second sailboard 128C are stretched on both sides of the ridge 166, so that the occupant's head can be restrained by the first sailboard 128B and the second sailboard 128C earlier than when only the expansion part such as the ridge 166 is used. Therefore, according to the airbag cushion 118, it is possible to suppress the occupant's head from falling to the side and rotating, and the damage value to the occupant can be preferably suppressed.

[0062] As described above, according to the airbag cushion 118, by using the first sailboard 128B and the second sailboard 128C, the protection performance for the occupant can be improved without making a major design change to the conventional airbag cushion in terms of shape, etc. If the airbag cushion 118 can achieve early head restraint while satisfying the restraint performance and packaging performance of the conventional airbag cushion, it helps to further improve the occupant restraint performance.

[0063] Figure 4 It is shown Figure 2 FIG. 1 is a diagram of a modified example (airbag cushion 200) of the airbag cushion 118. In the following description, the same reference numerals are given to the components that have been described, and the description is omitted. In addition, even if different reference numerals are given to components that have the same name as the components that have been described, they have the same structure and function.

[0064] Figure 4 (a) is a perspective view of the airbag cushion 200. In the main chamber 202 of the airbag cushion 200, a raised portion 204 is shaped to protrude forward from the base portion 168 below.

[0065] In the airbag cushion 200, the base 168 of the main chamber 202, the first sub-chamber 126B, and the second sub-chamber 126C are arranged along the seat back 106 (see Figure 3 ) and the raised portion 204 is expanded and unfolded at an angle rising upward from the base 168.

[0066] When the bulge 204 expands and expands, its front side bends forward and protrudes. In addition, one side 210 of the first sailboard 208B connected to the bulge 204 is longer than the other side 212 connected to the support portion 170, and has a shape close to an inverted trapezoid. Figure 4 (b)) has the same structure.

[0067] Figure 4 (b) shows the Figure 4(a) is a diagram of the airbag cushion 200. As described above, when the airbag cushion 200 is inflated and deployed, the raised portion 204 of the main chamber 202 of the airbag cushion 200 is aligned with the base 168 below (see Figure 4 (a)) protrudes upward and forward compared with the expansion portion such as the first sub-chamber 126B.

[0068] The raised portion 204 has a long dimension in the front-rear direction by protruding forward, and the seats 104 and 110 (see FIG. Figure 3 ) The first sailboard 208B and the second sailboard 208C also have an inverted trapezoidal shape with a larger upper side area, which can fully restrain the heads of the passengers on the seats 104 and 110.

[0069] As described above, with the airbag cushion 200 , the heads of the occupants on the seats 104 and 110 can also be restrained in a wider range and better by the raised portion 204 , the first sailboard 208B, and the second sailboard 208C.

[0070] Figure 5 It is shown Figure 2 (b) is a diagram of another modified example (airbag cushion 220) of the airbag cushion 118. Figure 5 The airbag cushion 220 is composed of a main chamber 124B, a first sub-chamber 126B and a first sailboard 128B, and the Figure 2 (b) The second sub-chamber 126C and the second sailboard 128C.

[0071] By using the airbag cushion 220, the occupant 122 can also be better received by the first sailboard 128B (see Figure 1 ) can restrain the head 142 of the occupant 122 while suppressing the damage value to the occupant 122. In particular, when the head 142 enters the first sailboard 128B, the bulge 166 tightened by the first sailboard 128B is inclined toward the head 142 and receives the head 142, so the airbag cushion 220 can also realize the early restraint of the head 142.

[0072] In addition, Figure 2 and Figure 4 In the embodiment shown, the first sailboard and the second sailboard are arranged symmetrically, but they may not be arranged symmetrically. Figure 2 The first sailboard 128B in (a) may be connected to the raised portion 166 at a position higher than the second sailboard 128C, or the second sailboard 128C may have a smaller inclination angle than the first sailboard 128B and be connected to the support portion 172 at a position away from the raised portion 166 .

[0073] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the present invention is not limited to the examples. A person skilled in the art can obviously think of various changes or modifications within the scope of the claims, which of course also belong to the technical scope of the present invention.

[0074] Furthermore, in the above-described embodiment, an example in which the side airbag device 100 according to the present invention is applied to an automobile has been described. However, the side airbag device 100 may be applied to aircraft, ships, etc. other than automobiles, and the same operational effects may be obtained.

[0075] Industrial Applicability

[0076] The present invention is applicable to a side airbag device including a bag-shaped airbag cushion that inflates and deploys toward the side of an occupant on a vehicle seat when a side collision of a vehicle occurs.

[0077] Explanation of symbols

[0078] 100…side airbag device, 102…vehicle, 104…seat, 106…seat back, 108…seat cushion, 110…seat, 112…seat back, 114…seat cushion, 118…airbag cushion, 120…inflator, 122…occupant, 124B…main chamber, 126B…first sub-chamber, 126C…second sub-chamber, 128B…first sailboard, 128C…second sailboard, 142…head, 166…raised portion, 168…base, 170… Support portion, 172 ... support portion, 174 ... inner corner, 176 ... inner corner, 178 ... right edge, 180 ... right edge, 182 ... right side, 184 ... left edge, 186 ... left edge, 188 ... left side, L1 ... straight line, L2 ... straight line, 200 ... airbag cushion, 202 ... main chamber, 204 ... raised portion, 208B ... first sailboard, 208C ... second sailboard, 210 ... one side, 212 ... the other side, 214 ... side, 220 ... airbag cushion

Claims

1. A side airbag device comprising a predetermined inflator and a bag-shaped airbag cushion, wherein the airbag cushion is provided on a side portion of a seat back of a vehicle seat and is inflated and deployed by gas supplied from the inflator, wherein: The airbag cushion comprises: a main chamber that expands and deploys at a side of the seat back; and, a first sub-chamber that protrudes from the main chamber toward one side of the seat back and expands and unfolds, The main chamber includes a bulge that bulges upward from the first sub-chamber when inflated and expanded. The airbag cushion further includes a first non-inflatable sailboard spanning an inner corner between the ridge and the first sub-chamber.

2. The side airbag device according to claim 1, characterized in that: The first sailboard is provided to connect an upper end portion of the raised portion and the protruding front end portion of the first sub-chamber.

3. The side airbag device according to claim 1 or 2, characterized in that: The airbag cushion is arranged so that the raised portion is located on the side of the head of the occupant sitting on the vehicle seat, When the main chamber and the first sub-chamber are inflated and deployed, the first sailboard is in a tensioned state at the side of the passenger's head.

4. The side airbag device according to claim 1 or 2, characterized in that: The airbag cushion further comprises: a second sub-chamber, which protrudes from the main chamber in a direction opposite to the first sub-chamber and expands and unfolds; A second non-inflatable sailboard is arranged across the inner corner between the ridge and the second secondary chamber.

5. The side airbag device according to claim 4, characterized in that: The second sailboard is provided to connect an upper end portion of the raised portion and the protruding front end portion of the second sub-chamber.

6. The side airbag device according to any one of claims 1, 2, 4 and 5, characterized in that: The raised portion of the main chamber protrudes further forward when inflated and deployed than a portion located below the raised portion of the main chamber.

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