JP5343947B2 - Side airbag device - Google Patents

Description

  The present invention relates to a side airbag device that inflates and deploys a bag body between a body of a passenger sitting on a seat and a side door.

  In the side airbag device disclosed in Patent Document 1 below, the size in the vehicle width direction of the bag body at the position corresponding to the shoulder portion of the occupant in the state where the expansion and deployment of the bag body is completed corresponds to the chest of the occupant. The vehicle width direction dimension of the bag body at the selected position is Mw, the vehicle width direction dimension of the bag body at the position corresponding to the passenger's abdomen is Hw, and the vehicle width direction dimension of the bag body at the position corresponding to the waist part of the passenger is When Yw is set, the shape and structure of the bag are set so that Kw> Mw> Hw> Yw. Since the bag body in the inflated and deployed state has a relationship as described above, the load applied to the occupant through the inflated and deployed bag body by the side door deformed inward in the vehicle width direction due to a side collision, The chest, abdomen, and waist are almost equal.

Japanese Laid-Open Patent Publication No. 2007-83835

  By the way, when the side door deformed inward in the vehicle width direction due to a side collision presses the seat cushion of the seat, the outer end portion of the seat cushion in the vehicle width direction and the vicinity thereof are deformed so as to rise upward. The seat cushion deformed in this way enters between the side door and the occupant's body, and tries to push up the bag body inflated and deployed between the side door and the occupant's body.

  In view of the above-described facts, an object of the present invention is to obtain a side airbag device that can suppress upward movement of a bag body by a seat cushion that is about to enter between a side door and a passenger's body.

  The side airbag device according to the first aspect of the present invention includes a bag body that inflates and deploys to the front side of the vehicle width direction outer end portion of the seat back when the gas is supplied, and operates to the bag body. Gas supply means for supplying gas, and the bag is inflated and deployed so as to extend in the front-rear direction of the seat between a seat cushion and a thigh of an occupant seated on the seat And a second bag portion that expands and expands so as to extend in the front-rear direction of the sheet above the first bag portion, and the expansion and deployment of the first bag portion and the second bag portion is completed. In the state, the first bag portion and the second bag portion are configured to sandwich the thigh up and down.

  In the side airbag device according to the first aspect of the present invention, when gas is supplied to the bag body by the operation of the gas supply means, the front side of the outer end in the vehicle width direction of the seat back constituting the seat is provided. The bag body expands and expands. This bag body has a first bag portion and a second bag portion, and the first bag portion is a seat cushion that constitutes a seat by the gas supplied from the gas supply means, and a thigh of an occupant seated on the seat. The sheet expands and expands to extend in the front-rear direction of the sheet.

  On the other hand, the second bag portion of the bag body is inflated and expanded so as to extend in the front-rear direction of the sheet above the first bag portion by the gas supplied from the gas supply means, and the first bag portion and the second bag portion are expanded. When the expansion and expansion of the bag portion is completed, the thigh portion of the seated occupant is sandwiched between the first bag portion and the second bag portion. In this state, the first bag portion abuts (interferes) with the thigh portion of the occupant, thereby suppressing the upward movement of the bag body.

  A side airbag device according to a second aspect of the present invention is configured such that in the first aspect of the present invention, the first bag portion is inflated and deployed before the second bag portion. .

  In the side airbag device according to the second aspect of the present invention, when the gas supply means is actuated to supply gas to the bag body, the first bag portion is inflated and deployed before the second bag portion. Thereby, a 1st bag part contact | abuts to a passenger | crew's thigh early, and the upward movement of a bag body can be suppressed early.

  According to a third aspect of the present invention, in the side airbag device according to the second aspect of the present invention, the capacity of the first bag portion is set smaller than that of the second bag portion.

  In the side airbag device according to the third aspect of the present invention, since the volume of the first bag portion is smaller than the second bag portion, the amount of gas supplied from the gas supply means to the first bag portion and the gas Even if the amount of gas supplied from the supply means to the second bag portion is the same, the expansion and deployment of the first bag portion is completed before the second bag portion. For this reason, a 1st bag part contact | abuts to a passenger | crew's thigh early, and the upward movement of a bag body can be suppressed early.

  According to a fourth aspect of the present invention, in the side airbag device according to the second or third aspect of the present invention, the gas supply means and the first bag portion are directly connected to the gas supply means. Connecting means for supplying the generated gas to the first bag portion, and the first bag portion and the second bag portion, provided so as to partition between the first bag portion and the second bag portion. And the flow of gas from the first bag portion to the second bag portion is blocked or the gas supply means to the first bag portion until the first bag portion is inflated and deployed. Partitioning means formed with a communication portion for limiting the amount of gas flowing from the first bag portion to the second bag portion to be smaller than the gas supply amount.

  In the side airbag device according to the fourth aspect of the present invention, the gas supply means and the first bag portion are directly connected by the connection means. For this reason, the gas generated by the gas supply means is directly supplied to the first bag portion.

  Moreover, the 1st bag part and the 2nd bag part are partitioned off by the partition means. A communication portion is formed in the partitioning means, and the first bag portion and the second bag portion communicate with each other through the communication portion, so that gas flows from the first bag portion to the second bag portion. Can do. However, this communication portion reduces the inflow amount of gas from the first bag portion to the second bag portion from the supply amount of gas from the gas supply means to the first bag portion until the expansion and deployment of the first bag portion is completed. The shape and the like are set so as to limit. For this reason, the expansion and deployment of the first bag portion precedes the expansion and deployment of the second bag portion.

  A side airbag device according to a fifth aspect of the present invention is the side airbag device according to any one of the first to fourth aspects, wherein the side bag device has a larger capacity than the second bag portion and the gas is supplied. Thus, the bag body is configured including the third bag portion that expands and expands above the second bag portion.

  In the side airbag device according to the fifth aspect of the present invention, when gas is supplied to the bag body by the operation of the gas supply means, the first bag portion and the second bag portion constitute the bag body. Three bag parts expand | swell and expand. Since the third bag portion has a larger capacity than the first bag portion and the second bag portion, and expands and expands above the second bag portion, the upper portion of the occupant's waist, for example, the abdomen and chest of the occupant Can be protected.

  A side airbag device according to a sixth aspect of the present invention is the side airbag device according to the fifth aspect of the present invention, wherein the expansion and deployment of the third bag portion precedes the second bag portion and the first bag. It is set to be later than the part.

  In the side airbag device according to the sixth aspect of the present invention, when gas is supplied to the bag body by operating the gas supply means, the third bag portion precedes the second bag portion, and It is sent from the first bag part and inflated and deployed. For this reason, when the bag body is inflated and deployed in the order of the first bag portion, the third bag portion, and the second bag portion, and the second bag portion to be inflated and deployed attempts to move upward, the bag body has already inflated and deployed. The 3rd bag part which presses down presses the 2nd bag part from the top, and raises the 2nd bag part. Thereby, the 1st bag part and the 2nd bag part can be inflate-deployed near the crew member's waist part still more reliably.

  As described above, the side airbag device according to the first aspect of the present invention can suppress the inflated and deployed bag body from moving upward.

  In the side airbag device according to claim 2, the first bag portion inflating and deploying to the occupant's thigh from below is preceded by the inflating and deploying of the second bag portion. The bag portion can be brought into contact at an early stage, and the upward movement of the bag body can be suppressed at an early stage.

  In the side airbag apparatus of Claim 3 and Claim 4, the 1st bag part contact | abutted from a passenger | crew's thigh from below can be inflate-deployed early, and the upward movement of a bag body can be suppressed early. .

  According to the fifth aspect of the present invention, the side airbag device according to the present invention can protect the occupant's waist, for example, the abdomen and chest of the occupant, by the third bag part inflated and deployed above the second bag part.

  In the side airbag device according to the present invention described in claim 6, the second bag portion can be prevented from rising by the third bag portion, and the first bag portion and the second bag portion can be more reliably near the occupant's waist. Can be inflated and deployed.

1 is a side sectional view schematically showing a configuration of a side airbag device according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is front sectional drawing which shows schematically the structure of the side airbag apparatus which concerns on one embodiment of this invention, (A) shows the state which the 1st bag part and the 3rd bag part inflate-deployed, (B) is Furthermore, the state which the 2nd bag part expanded and expanded is shown. It is side surface sectional drawing which shows schematically the structure of the modification of the side airbag apparatus which concerns on one embodiment of this invention.

  Next, an embodiment of the present invention will be described with reference to FIGS. In each figure, the arrow FR indicates the front of the vehicle seat 12 on which the side airbag device 10 is mounted (the front of the vehicle on which the vehicle seat 12 is mounted), and the arrow UP is above the vehicle seat 12 ( The upper side of the vehicle on which the vehicle seat 12 is mounted is indicated, and the arrow OUT indicates the outer side in the width direction of the vehicle seat 12 (outward in the width direction of the vehicle on which the vehicle seat 12 is mounted).

<Configuration of this embodiment>
FIG. 1 is a schematic side view showing a configuration of a main part of a vehicle seat 12 on which a side airbag device 10 according to the present embodiment is mounted. As shown in this figure, the vehicle seat 12 includes a seat cushion 16 on which an occupant 14 is seated. A seat back 18 having a function as a backrest of the vehicle seat 12 is provided at a rear end portion of the seat cushion 16. An inflator 22 as a gas generating means constituting the side airbag device 10 is provided in the vicinity of the outer end in the vehicle width direction inside the seat back 18.

  The inflator 22 is formed in a cylindrical shape whose longitudinal direction is substantially along the direction inclined in the front-rear direction with respect to the vertical direction of the vehicle seat 12 and whose longitudinal ends are closed. Inside the inflator 22 are provided a gas generating agent that generates a large amount of gas instantaneously by burning, an ignition agent for burning the gas generating agent, an ignition device for burning this ignition agent, and the like. . When the ignition device is actuated, the ignition agent is ignited. As a result, the gas generating agent is combusted to generate gas. It comes to be ejected.

  The side airbag device 10 includes a bag body 32. The bag body 32 is formed in a bag shape opened toward the rear of the vehicle seat 12. In the vicinity of the opening end of the bag body 32 inside the bag body 32, the inflator 22 is entirely or lower than the middle portion in the longitudinal direction. Although detailed illustration is omitted, the bag body 32 is usually housed together with the inflator 22 inside the seat back 18 in a folded state. When the inflator 22 is actuated and gas is ejected from the gas ejection part 24, the bag body 32 is expanded by the pressure of this gas, and the vicinity of the stitching part where the front and side surfaces of the skin of the seat back 18 are sewn together. The suture part is broken by pressing from the inside. Thus, when the stitched portion is opened, the bag body 32 is inflated and deployed in the vicinity of the outer end in the vehicle width direction of the seat back 18 and on the front side of the seat back 18 as shown in FIG.

  Inside the bag body 32 are provided tethers 34 and 36 as partitioning means, respectively. Each of the tethers 34 and 36 is formed in a narrow band shape whose longitudinal direction is along the front-rear direction of the vehicle seat 12 and whose width direction is along the left-right direction of the vehicle seat 12.

  The rear end portion in the longitudinal direction of the tether 34 is below the opening end of the bag body 32, and is sewn and connected to the rear end of the bag body 32 in an inflated and deployed state. The front end portion in the longitudinal direction of the tether 34 is stitched and connected to the front end of the inflated and deployed bag body 32. Furthermore, both ends in the width direction of the tether 34 are stitched and connected to both sides in the left-right direction of the vehicle seat 12 in the bag body 32 in an inflated and deployed state.

  On the other hand, the rear end portion in the longitudinal direction of the tether 36 is below the opening end of the bag body 32, and is sewn and connected to the rear end of the bag body 32 in an inflated and deployed state. The front end of the tether 36 in the longitudinal direction is connected to the front end of the inflated and deployed bag body 32 by sewing. Further, both end portions in the width direction of the tether 36 are respectively stitched and connected to both lateral sides of the vehicle seat 12 in the inflated and deployed bag body 32.

  Thus, the interior space of the bag body 32 is partitioned into three vertically by the tethers 34 and 36, and the lower part of the bag body 32 than the tether 36 is the first bag portion 38. A portion between the tether 34 and the tether 36 is a second bag portion 40, and a portion above the tether 34 in the bag body 32 is a third bag portion 42.

  As shown in FIG. 1, in the inflated and deployed state of the bag body 32, the vertical dimension of the first bag portion 38 is shorter than the vertical dimension of the second bag portion 40, and the capacity (volume) of the first bag portion 38. The tether 36 is sewn in the bag 32 so as to be smaller than the capacity of the second bag 40, and the inflated and deployed first bag 38 is the thigh of the occupant 14 seated on the seat cushion 16. It faces the waist of the occupant 14 below the middle part in the vertical direction. On the other hand, the inflated and deployed second bag portion 40 faces the lumbar portion of the occupant 14 above the middle portion in the vertical direction of the thigh of the occupant 14 seated on the seat cushion 16.

  In the inflated and deployed state of the bag body 32, the vertical dimension of the third bag part 42 is longer than the vertical dimension of the second bag part 40 (more specifically, in this embodiment, the vertical dimension of the third bag part 42). Is longer than the sum of the vertical dimension of the second bag part 40 and the vertical dimension of the first bag part 38). In addition, the capacity of the third bag portion 42 is larger than the capacity of the second bag portion 40 (more specifically, in this embodiment, the capacity of the third bag portion 42 is equal to the capacity of the second bag portion 40 and the first bag. The stitching position of the tether 34 in the bag body 32 is set so as to be larger than the sum of the capacity of the portion 38, and the inflated and deployed third bag portion 42 is the abdomen of the occupant 14 seated on the seat cushion 16. Opposite to chest and shoulder.

  On the other hand, the side airbag device 10 includes a diffuser 52 that constitutes connection means as gas distribution means. The diffuser 52 is formed entirely of cloth or a foldable sheet material, and is provided in the bag body 32 in the vicinity of the opening end of the bag body 32. The diffuser 52 includes a cylindrical portion 54. The cylindrical portion 54 is formed in a cylindrical shape, and the upper end thereof is opened inside the third bag portion 42. Further, the lower side of the cylindrical portion 54 than the intermediate portion in the vertical direction passes through the tether 34 and the tether 36, and the lower end of the cylindrical portion 54 is opened inside the first bag portion 38.

  Further, the diffuser 52 includes an inflator accommodating portion 56. The inflator accommodating portion 56 is formed in a cylindrical shape having at least a rear end opened, and the inflator 22 is entirely or below the middle portion in the longitudinal direction. Further, the front end of the opened inflator accommodating portion 56 is connected to the cylindrical portion 54 above the tether 34, and the inside of the inflator accommodating portion 56 and the inside of the cylindrical portion 54 communicate with each other.

  Although detailed illustration is omitted, normally, the diffuser 52 is housed inside the seat back 18 in a state of being folded together with the bag body 32. When the inflator 22 is operated and gas is ejected from the gas ejection part 24, the inflator accommodating part 56 and the cylindrical part 54 are expanded by the pressure of the gas, and the gas passes through the cylindrical part 54. The gas that has passed through the cylindrical portion 54 is released from the upper end portion of the cylindrical portion 54 to inflate and deploy the third bag portion 42 of the bag body 32 and is discharged from the lower end portion of the cylindrical portion 54 to form the bag body 32. The first bag portion 38 is inflated and deployed.

  That is, in the side airbag device 10, the gas generated in the inflator 22 is supplied to the first bag portion 38 and the third bag portion 42 via the diffuser 52, but the diffuser 52 is in the second bag portion 40. In this case, the gas is not directly supplied to the second bag portion 40.

  In addition, a hole 62 as a communication portion is formed in the middle portion in the longitudinal direction of the upper tether 34, and the third bag portion 42 and the second bag portion 40 communicate with each other through the hole 62. . Further, a hole 64 as a communication portion is formed in the middle portion in the longitudinal direction of the lower tether 36, and the first bag portion 38 and the second bag portion 40 communicate with each other through the hole 64. . As described above, the gas is not directly supplied from the inflator 22 to the second bag portion 40, but the gas supplied to the first bag portion 38 and the third bag portion 42 passes through the hole portion 62 and the hole portion 64. By passing the gas, the gas flows into the second bag part 40, and the second bag part 40 is inflated and deployed by the pressure of the gas.

<Operation and Effect of First Embodiment>
Next, the operation and effect of the present embodiment will be described.

  For example, when a so-called “side collision” occurs, as shown in FIG. 2, when a load having a predetermined magnitude or more from the outside in the vehicle width direction is applied to the side door 72, the side airbag device 10 is activated. To do. When the side airbag device 10 is activated, the ignition device in the inflator 22 ignites the ignition agent and instantly burns the gas generating agent. When gas is generated in the inflator 22 by burning the gas generating agent, this gas is jetted out of the inflator 22 from the gas jetting part 24.

  Since the gas ejection part 24 side of the inflator 22 is disposed in the inflator accommodating part 56 of the diffuser 52, the gas ejected to the outside of the inflator 22 expands the inflator accommodating part 56 and the cylindrical part 54, and the cylindrical part. 54 is supplied into the third bag portion 42 of the bag body 32 from the upper end portion of the bag body 32 to inflate and deploy the third bag portion 42, and further into the first bag portion 38 of the bag body 32 from the lower end portion of the cylindrical portion 54. The first bag portion 38 is supplied and expanded. Thus, when the 1st bag part 38 and the 3rd bag part 42 expand | swell, when the stitching | suture part vicinity of the front surface and side surface of the epidermis in the seat back 18 is pressed, a fracture | rupture arises in a stitching | suture part and a bag body 32 bulges forward of the seat back 18.

  In this state, the gas further generated in the inflator 22 is supplied from the upper and lower ends of the diffuser 52 to the third bag portion 42 and the first bag portion 38, and passes through the third bag portion 42 and the first bag portion 38 to the side of the occupant 14. Inflate and deploy between the door 72. Here, the first bag portion 38 and the second bag portion 40 communicate with each other via the hole portion 64 of the tether 36, and the third bag portion 42 and the second bag portion 40 communicate with the hole portion 62 of the tether 34. 2A, as shown in FIG. 2A, the gas supplied to the first bag portion 38 and the third bag portion 42 is caused by the passage resistance in the hole portion 62 and the hole portion 64. The first bag portion 38 and the third bag portion 42 are inflated and deployed to some extent or until the first bag portion 38 and the third bag portion 42 are inflated and deployed, the first bag portion 38 and the third bag portion 42 do not flow into the second bag portion 40. The bag portion 38 and the third bag portion 42 are inflated and deployed.

  The gas that has passed through the cylindrical portion 54 of the diffuser 52 is supplied to the first bag portion 38 and the third bag portion 42, but the capacity of the first bag portion 38 is larger than the capacity of the third bag portion 42. Since it is sufficiently small, for example, even if the gas supply amount per unit time for each of the first bag portion 38 and the third bag portion 42 is the same, the first bag portion 38 is earlier than the third bag portion 42. Expands and expands.

  Since the first bag portion 38 inflated and deployed early in this manner faces the lumbar portion of the occupant 14 below the middle portion in the vertical direction of the thigh of the occupant 14 seated on the seat cushion 16, the first bag portion A part of 38 enters a gap between the thigh of the occupant 14 and the upper surface of the seat cushion 16 and comes into contact with the thigh of the occupant 14 from below. For this reason, when the 1st bag part 38 and by extension, the bag body 32 tries to raise, since the thigh of the passenger | crew 14 will interfere with the 1st bag part 38 from the upper side, the 1st bag part 38 and by extension the bag body 32 Is prevented or suppressed.

  As a result, the side door 72 that has received a load from the outside in the vehicle width direction and entered the vehicle interior side presses the seat cushion 16 so that the seat cushion 16 rises, and the bag body 32 between the side door 72 and the occupant 14. Can be prevented or suppressed by the first bag portion 38 that is restricted from rising, and the first bag portion 38 is pushed up by the seat cushion 16 that is about to enter the development region of the bag body 32. The rise can be prevented or suppressed.

  When the first bag portion 38 is inflated and deployed to some extent or when the first bag portion 38 is inflated and deployed, the gas supplied to the first bag portion 38 from the lower end portion of the tubular portion 54 is transferred to the tether. The second bag portion 40 is inflated and deployed by passing through the 36 hole portions 64 and flowing into the second bag portion 40. As shown in FIG. 1 and FIG. 2B, the inflated and deployed second bag portion 40 is located above the middle portion in the vertical direction of the thigh of the occupant 14 seated on the seat cushion 16 and the waist of the occupant 14. Since it opposes, the waist | hip | lumbar part of the passenger | crew 14 is protected with the 1st bag part 38 which expand | deployed previously.

  Here, the gas is already supplied to the third bag portion 42 in a state where the gas is supplied to the second bag portion 40 and the expansion and deployment of the second bag portion 40 is started, and the second bag portion 40 is inflated to some extent. doing. For this reason, when the second bag portion 40 that is inflated and deployed is going to rise with the first bag portion 38, the third bag portion 42 that has already been inflated and deployed above the second bag portion 40 is the second bag portion. 40 to prevent or suppress the second bag portion 40 from rising. For this reason, it can prevent or control effectively that the 1st bag part 38 and the 2nd bag part 40 move from the side of the waist part of crew member 14.

  Further, since the second bag portion 40 that has been inflated and deployed is opposed to the lumbar portion of the occupant 14 above the intermediate portion in the vertical direction of the thigh of the occupant 14 seated on the seat cushion 16, FIG. As shown, the second bag portion 40 that has been inflated and deployed sandwiches the thigh of the occupant 14 vertically together with the first bag portion 38 that has been inflated and deployed first. Accordingly, inadvertent movement of the first bag portion 38 and the second bag portion 40 is further restricted, and the waist portion of the occupant 14 can be effectively protected by the first bag portion 38 and the second bag portion 40.

  Moreover, the inflated and deployed third bag portion 42 is interposed between the body of the occupant 14 and the side door 72 on the side of the abdomen, chest, and shoulders of the occupant 14 to sandwich the abdomen, chest, and shoulders of the occupant 14. Although it protects, since the inadvertent movement of the 3rd bag part 42 can be controlled by being able to control inadvertent movement of the 1st bag part 38 or the 2nd bag part 40 as mentioned above, the abdomen and chest part of the passenger | crew 14 , Can effectively protect the shoulder.

  In the present embodiment, the gas supplied to the first bag portion 38 and the third bag portion 42 is supplied to the second bag portion 40 by passing through the hole portion 62 of the tether 34 and the hole portion 64 of the tether 36. However, this is only one means for causing the first bag portion 38 and the third bag portion 42 to be inflated and deployed before the second bag portion 40 is inflated and deployed. In addition, the configuration is not limited to such a configuration in order to cause the expansion and deployment of the third bag portion 42 to precede the expansion and deployment of the second bag portion 40.

  For example, as shown in FIG. 3, the base end portion of a cylindrical branch cylinder 82 provided between the tether 34 and the tether 36 without forming the holes 62 and 64 in the tether 34 and 36 is cylindrical. The gas generated in the inflator 22 connected to the portion 54 is supplied to the second bag portion 40 without passing through the first bag portion 38 and the third bag portion 42, and further, the expansion and deployment is performed in the first bag. The opening shape including the opening cross-sectional area of the upper end and the lower end of the tubular portion 54 and the opening cross-sectional area of the branch tube 82 so that the portion 38, the third bag portion 42, and the second bag portion 40 are in this order. You may set suitably. Further, although not shown, at least one of the hole 62 and the hole 64 may be further provided in the configuration shown in FIG.

  In the present embodiment, the first bag portion 38, the second bag portion 40, and the third bag portion 42 are formed in the bag body 32 by the tethers 34 and 36, but the first bag is formed in the bag body 32. The configuration of the partition means for forming the portion 38, the second bag portion 40, and the third bag portion 42 is not limited to such a configuration. For example, the first bag portion is attached to the bag body 32 by sewing or seam welding. 38, the 2nd bag part 40, and the 3rd bag part 42 are good also as a structure formed. Furthermore, three bag bodies corresponding respectively to the first bag portion 38, the second bag portion 40, and the third bag portion 42 may be independently formed and connected by stitching or the like.

  Further, the vehicle seat 12 on which the side airbag device 10 is mounted may be a front seat such as a driver seat or a passenger seat, or a rear seat, and is not limited to a specific installation position. .

DESCRIPTION OF SYMBOLS 10 Side airbag apparatus 12 Vehicle seat 14 Crew 16 Seat cushion 18 Seat back 22 Inflator (gas supply means)
32 Bag 34 Upper tether (partitioning means)
36 Lower tether
38 1st bag part 40 2nd bag part 42 3rd bag part 52 Diffuser (connection means)

Claims (6)

A bag body that inflates and deploys to the front side of the vehicle width direction outer end portion of the seat back by supplying gas;
A gas supply means for supplying gas to the bag body by operating;
In addition, the bag body,
A first bag portion that expands and expands so as to extend in the front-rear direction of the seat between the seat cushion and the thigh of an occupant seated on the seat;
A second bag portion that expands and expands to extend in the front-rear direction of the sheet above the first bag portion;
And the first bag portion and the second bag portion are configured such that the first bag portion and the second bag portion sandwich the thigh vertically when the first bag portion and the second bag portion are inflated and deployed. Airbag device.   The side airbag device according to claim 1, wherein the first bag portion is inflated and deployed before the second bag portion.   The side airbag device according to claim 2, wherein a capacity of the first bag portion is set smaller than that of the second bag portion. Connection means for directly connecting the gas supply means and the first bag portion to supply the gas generated by the gas supply means to the first bag portion;
The first bag portion and the second bag portion are provided so as to partition the first bag portion, the first bag portion and the second bag portion are communicated with each other, and the expansion and deployment of the first bag portion is completed. Until the flow of gas from the first bag portion to the second bag portion is blocked, or the amount of gas supplied from the gas supply means to the first bag portion is greater than the first bag portion to the second bag portion. Partition means formed with a communication portion for limiting the amount of gas inflow of
A side airbag device according to claim 2 or claim 3, comprising:   The capacity of the bag is larger than that of the second bag portion, and the bag body includes the third bag portion that expands and expands above the second bag portion when the gas is supplied. The side airbag device according to any one of the above.   The side airbag device according to claim 5, wherein the expansion and deployment of the third bag portion is set to precede the second bag portion and to be delayed from the first bag portion.

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