JP2018016164A - Airbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag that can restrain the head of an occupant more effectively with an inexpensive configuration.SOLUTION: In an airbag main body part 33, a second joint part 46 without a bent part is formed linearly along a vertical direction at a position opposing to a side part of a headrest S3 of a front seat S arranged at a predetermined position at a predetermined angle. By the second joint part 46, a rear part of a front side main chamber 51 is partitioned. This allows the front-side main chamber 51 to restrain a rear side of a side part of the head A1 of an occupant A seated on the front seat without using other members and special equipment, which can suppress the head A1 from rotating in a vertical shaft direction. Thus, the head A1 of the occupant A can be more effectively restrained with an inexpensive configuration.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an airbag including an airbag main body that expands in a vehicle width direction and expands along a predetermined surface on a side of a seat in a vehicle interior.

  2. Description of the Related Art Conventionally, an airbag device having an airbag that is inflated and deployed by introducing gas, a so-called curtain that deploys the airbag along a predetermined surface including a pillar portion of a side portion of a vehicle compartment and a window portion of a door. Airbag devices are known. The airbag of such an airbag device is normally folded long and is arranged along the roof side portion of the upper edge portion of the window portion. When an impact such as a side collision or rollover occurs, gas is supplied from the inflator and the airbag is inflated and deployed downward along the side window glass to restrain the occupant. Protect your head.

  In such an airbag device, for example, in order to increase the head protection area, air chambers that inflate to the occupant side and air chambers that inflate to the vehicle body side are alternately arranged in the front and rear, and the rear side of each air chamber is By adopting a non-inflatable portion, a configuration in which the thickness of the airbag at the time of inflation is made uniform (see, for example, Patent Document 1), and the occupant side and the vehicle body side inside the airbag are connected by a large number of limiting yarns. Thus, a configuration in which the thickness of the airbag at the time of inflation is made uniform (see, for example, Patent Document 2) is known.

JP 2004-268880 A (page 3-7, FIG. 3) International Publication No. 2015/005308 (Page 5-7, Fig. 2)

  However, in the case of the configuration described in Patent Document 1, a large number of base fabrics are required, and in the case of the configuration described in Patent Document 2, special equipment for manufacturing is required.

  In recent years, the head of the occupant may rotate when the airbag is in contact during an oblique collision. In order to suppress this, it is desired to restrain the head with a wider and flat air chamber.

  The present invention has been made in view of these points, and an object of the present invention is to provide an airbag that can more effectively restrain an occupant's head with an inexpensive configuration.

  The airbag body according to claim 1 is formed in a bag shape, is supplied with gas from a folded state, and is deployed along a predetermined surface on the side of the seat in the passenger compartment to inflate in the vehicle width direction. The airbag main body portion has a bent portion at a position facing a side portion of the headrest of the seat arranged at a predetermined position and angle determined in advance. And a non-inflatable portion formed in a straight line, and an air chamber in which a rear portion is partitioned by the non-inflatable portion and restrains the head of an occupant seated on the seat.

  The airbag according to claim 2 is the airbag according to claim 1, wherein the airbag main body portion includes a front non-inflatable portion that divides a front lower portion of the air chamber at a position in front of a head of an occupant seated on the seat. It is provided.

  According to the airbag according to claim 1, the airbag is formed in a straight line along the vertical direction without a bent portion at a position facing the side portion of the headrest of the seat arranged at a predetermined position and angle determined in advance. By dividing the rear part of the air chamber by the non-inflatable part, the head side can be restrained by the air chamber on the side rear side of the head of the occupant seated on the seat without using other members or special equipment, for example. Therefore, the head of the occupant can be more effectively restrained with an inexpensive configuration.

  According to the airbag of the second aspect, in addition to the effect of the airbag of the first aspect, the front lower portion of the air chamber is formed by the front non-inflatable portion formed at a position in front of the head of the occupant seated on the seat. By dividing, the front side of the occupant's head seated on the seat is controlled not to be actively suppressed by the air chamber, and the head's head can be prevented from rotating in the vertical axis direction, making the occupant's head more effective Can be restrained.

It is a side view which shows a part of airbag of the 1st Embodiment of this invention. (A) is explanatory drawing which shows typically the positional relationship of the air chamber of an airbag same as the above, and a passenger | crew's head from upper direction, (b) is the air chamber of the airbag of a comparative example, and the passenger | crew's head. Explanatory drawing which shows a positional relationship typically from the upper part, (c) is explanatory drawing which shows typically a positional relationship between the air chamber of the airbag of another comparative example, and a passenger | crew's head from upper direction. (A) is explanatory drawing which shows typically the positional relationship of the air chamber of an airbag same as the above, and a passenger | crew's head from a front side, (b) is the air chamber of the airbag of another comparative example, and a passenger | crew's head. It is explanatory drawing which shows typically positional relationship with from the front side. It is a side view which shows the state which attached the airbag same as the above to the vehicle body from the vehicle interior side. (A) is explanatory drawing which shows typically the front-back position of the seat of the vehicle body which attached the airbag same as the above, (b) is explanatory drawing which shows typically the seat angle of a seat. It is a side view which shows a part of airbag of the 2nd Embodiment of this invention.

  The configuration of the first embodiment of the present invention will be described below with reference to FIGS.

  In FIG. 4, reference numeral 10 denotes an airbag. An airbag device 11 provided with the airbag 10 is also called a curtain airbag device, and is a roof side portion 15 as a storage position of a compartment 14 of a vehicle body of a vehicle which is a vehicle. Is arranged. The airbag 10 is also called a curtain airbag, a side-impact airbag, an inflatable curtain, or a head protection airbag. The airbag 10 is subjected to a side impact or rollover. For example, it is developed in a downward direction in a predetermined direction on the side of an occupant as a protected object to protect the occupant's head and the like.

  In the following description, the front-rear direction, the vehicle width direction, the both-side direction, the up-down direction, and the like are based on the straight direction of the vehicle, and the front direction (arrow F direction), rear direction (arrow R direction), and upward (arrow U direction), the lower side (arrow D direction), the outside of the vehicle compartment 14 (arrow W direction), the inside of the vehicle compartment 14 (arrow C direction), and the like will be described.

  The vehicle body includes a front seat S that is a seat on which an occupant can be seated and a rear seat (not shown) in the passenger compartment 14, and the front seat S and the rear seat can be opened to the upper part respectively. A door (not shown) having (first and second) window portions (side windows) 18 and 19 covered with glass is provided. Further, on both sides of the passenger compartment 14, in order from the front side, a front pillar 21 as a (first) columnar body called a A pillar, a center pillar 22 as a (second) columnar body also called a B pillar, and a C pillar The rear pillar 23 as a (third) columnar body, which is also called, is provided, the window 18 is located behind the front pillar 21 and in front of the center pillar 22, and behind the center pillar 22 and in front of the rear pillar 23. The window part 19 is located in the front. The windows 18 and 19, the doors, and the pillars 21, 22, and 23 constitute a predetermined surface 24 on which the airbag 10 is deployed on both sides of the passenger compartment 14. In addition, a vehicle body panel 25 that constitutes a member to be attached, which is also called a roof side rail, is provided on the upper side of the pillars 21, 22, and 23, that is, the upper edge portion that is one edge portion of the window portions 18 and 19. A ceiling panel as a ceiling portion is supported via the panel 25. A front glass (front windshield) is provided on the front side of the front pillars 21 on both sides, and a rear glass is provided on the rear side of the rear pillars 23 on both sides. And the roof side part 15 as a storage position is set from the edge part on both sides of the ceiling panel to the part covering almost the entire length of the front pillar 21 and the rear pillar 23 extending in a direction intersecting with this edge part. Then, a predetermined surface 24 is set inside an arc virtually formed by the edge portion of the ceiling panel and the front pillar 21 and the rear pillar 23.

  Here, the center pillar 22 indicates not a pillar portion at the front and rear ends but a pillar portion covered with the deployed airbag 10. Depending on the type of vehicle, for example, four or more pillar portions may be provided on one side, but the third and subsequent pillar portions from the front will be described as the rear pillar 23.

  The front seat S schematically shown in FIGS. 5A and 5B includes a seat S1 on which an occupant sits, and a backrest S2 that rises upward from the rear of the seat S1 and supports the occupant's back. And a headrest S3 that is located at the upper end of the backrest S2 and supports the head of the passenger from behind. The front seat S is provided so as to be movable back and forth with respect to the vehicle body (FIG. 5 (a)), and the backrest S2 and the headrest S3 are tilted back and forth with respect to the seat S1 by the reclining function. This is possible (FIG. 5B). The headrest S3 may be pivotable back and forth with respect to the backrest S2, or may be extendable up and down. Further, a side airbag 26 (side airbag device) that restrains the occupant's body may be accommodated in the side portion of the front seat S. The side airbag 26 is inflated and deployed between the occupant's body and the door by gas supplied from an inflator (not shown) to protect the occupant's body. Hereinafter, the front seat S is located at the center (center) in the moving range in the front-rear direction, which is a predetermined position as shown by the solid line in FIG. As shown by the solid line, the headrest S3 is inclined to an angle that is a neutral position of the reclining function, which is a predetermined angle, and the headrest S3 has a predetermined predetermined use angle that suppresses the head of the occupant. State.

  The airbag device 11 shown in FIG. 4 is a so-called front / rear seat airbag that can protect the passengers in the front seat S and the rear seat, from the upper end of the vehicle body panel 25 and the pillars 21, 22, and 23 to the ceiling. The air bag 10 is folded and stored along the upper edge of the door opening of the vehicle body, which is surrounded by the head lining, which is a ceiling covering member as a continuous interior material, and the rear seat. An inflator 27, which is a gas generator that is stored behind or above and supplies gas to the airbag 10, and the like. The airbag device 11 includes a bracket (not shown) formed by pressing a metal plate for attaching the airbag 10 to the vehicle body panel, and a breakable cylinder or string that holds the shape of the folded airbag 10. And a tether belt 29 as a tether portion connected to the front end portion of the airbag 10. In addition, the interior side of each passenger compartment 14 of each pillar 21, 22, 23 is covered with a pillar garnish which is a cover body as a structure, that is, a covering interior material.

  The airbag 10 shown in FIGS. 1 to 4 includes a gas introduction part 32 as an inflator connection part into which an inflator 27 is inserted and connected to introduce gas, and an airbag main body part 33 formed in a flat bag shape. A plurality of upper edge portions are attached to the vehicle body side via a plurality of attachment portions 34, for example, the front end portion is attached to the vehicle body side by the tether belt 29, and is elongated above the center pillar 22 in a folded state. A roof side portion 15 is housed in a longitudinal shape along the front-rear direction. In the present embodiment, the airbag 10 is of a so-called center mount type, and the gas introduction part 32 is provided at the center of the upper part of the airbag main body part 33 in the front-rear direction, for example.

  The gas introduction part 32 and the airbag main body part 33 are constituted by one or a plurality of base fabrics. For example, the outer edge part of the airbag 10 is joined to the airbag 10 by the outer edge airbag joining part 36, respectively. Is set. The rear end portion (upper end portion) of the gas introduction portion 32 is an insertion opening 38 into which the inflator 27 is inserted.

  In the airbag main body 33, a plurality of inflating portions 42 that are inflated by the introduction of gas are formed by joint portions 41 that are a plurality of restricting portions that restrict the flow of gas. The joint portion 41 is formed, for example, as a sewing portion that is continuous with the outer-rim airbag joint portion 36. In the present embodiment, the joint portion 41 includes first to fourth restriction portions as first to fourth restriction portions. Junctions 45, 46, 47, and 48 are set, respectively. Further, each of the joint portions 41 is formed in a linear shape, and a protection portion 41a in which a base fabric is joined in a circular shape is formed at the tip portion. By providing such a protective portion 41a, securing of the base fabric during inflation and deployment and prevention of wrinkles are generated, and stress concentration generated at the end of the joint portion 41 during inflation and deployment of the airbag body 33 Sufficient strength can be obtained.

  The first joint portion 45 is formed as a (first) non-expandable portion, and is located farther forward than the second to fourth joint portions 46 to 48. That is, the first joint 45 is located at the forefront of the joint 41. In the present embodiment, the first joining portion 45 is in front of the headrest S3 of the front seat S in the deployed state of the airbag 10 (airbag body portion 33), and the front end portion of the airbag body portion 33. The base end side is located near the upper end of the front pillar 21. That is, the first joint portion 45 is located in front of the head A1 of the occupant A seated in the front seat S in the deployed state of the airbag 10 (airbag main body portion 33). And this 1st junction part 45 is formed along the up-down direction. Specifically, the first joint portion 45 is a bent portion having an upper edge portion of the airbag body portion 33 (outer edge airbag joint portion 36) as a base end portion and a tip portion inclined toward the front lower side. The front end portion is separated from the lower edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36).

  The second joint portion 46 is formed as a (second) non-expandable portion, and is located behind the first joint portion 45 and ahead of the third and fourth joint portions 47 and 48. ing. In the present embodiment, the second joining portion 46 is located at a substantially central portion in the front-rear direction of the airbag main body portion 33. The second joint 46 is located in the vicinity of the front edge of the center pillar 22 at a position facing the side of the headrest S3 of the front seat S in the deployed state of the airbag 10 (airbag body 33). Yes. That is, the second joint 46 is located behind the head A1 of the occupant A seated in the front seat S in the deployed state of the airbag 10 (airbag body 33). And this 2nd junction part 46 is formed along the up-down direction. Specifically, the second joint portion 46 has a bent portion in which the lower end portion of the airbag body portion 33 (outer edge airbag joint portion 36) is a base end portion, and the distal end portion is inclined toward the rear upper side. It is formed in a straight line that does not have, and the tip is spaced from the upper edge of the airbag body 33 (outer edge airbag joint 36). In addition, the second joint portion 46 is positioned so that the tip portion is spaced apart from and opposed to the lower portion of the gas introduction portion 32. Further, the second joint 46 is formed substantially in parallel with the first joint 45.

  The third joint portion 47 is formed as a (third) non-expandable portion, and is located behind the first and second joint portions 45 and 46 and ahead of the fourth joint portion 48. ing. In the present embodiment, the third joint portion 47 is located behind the headrest S3 of the front seat S and in the vicinity of the rear edge of the center pillar 22 in the deployed state of the airbag 10 (airbag main body portion 33). positioned. That is, the third joint 47 is seated in the rear seat and behind the head A1 of the occupant A seated in the front seat S in the deployed state of the airbag 10 (airbag body portion 33). It is located in front of the passenger's head. And this 3rd junction part 47 is formed along the up-down direction. Specifically, the third joint portion 47 has a distal end at the rear edge of the second joint portion 46 of the lower edge portion of the airbag body portion 33 (outer edge airbag joint portion 36). The tip part is inclined toward the upper rear side, and the tip part is formed in a curved shape that curves backward, and the tip part is separated from the upper edge part of the airbag body part 33 (outer edge airbag joint part 36). And located near the lower edge of the airbag body 33 (outer edge airbag joint 36). The third joint portion 47 is formed to be shorter than the second joint portion 46 by a length less than half.

  The fourth joint portion 48 is formed as a (fourth) non-expandable portion and is located behind the first to third joint portions 45 to 47. In the present embodiment, the fourth joint portion 48 is the rearward of the headrest S3 of the front seat S and the occupant seated in the rear seat in the deployed state of the airbag 10 (airbag main body portion 33). It is located forward of the head and is spaced forward of the rear end of the airbag body 33. And this 4th junction part 48 inclines toward the front upper side by using the lower edge part of the airbag main-body part 33 (outer edge airbag junction part 36) as a base end part, and an intermediate part is airbag main-body part 33 ( The front edge of the outer edge airbag joint 36) is spaced downward from the upper edge, that is, substantially parallel to the upper edge of the airbag body 33 (outer airbag joint 36). The tip portion is formed in a bent shape so as to face the top portion of the third joint portion 47.

  Then, the joint portion 41 causes the inflating portion 42 to have a front main chamber 51 that is a (first) air chamber, a rear main chamber 52 that is a (second) air chamber, and (first ) A front sub-chamber 53 that is a sub chamber and a rear sub-chamber 54 that is a (second) sub chamber are set, and a gas flow path 55 is set.

  The front main chamber 51 restrains the head A1 of the occupant A seated on the front seat S by the development of the airbag 10 (airbag main body 33), and the front side is partitioned by the first joint 45, The rear side is defined by two joint portions 46, and the upper and lower sides are defined by outer edge airbag joint portions 36. The front lower portion of the front main chamber 51 is partitioned by a lower joint portion 57 that is a front non-expanding portion. The front main chamber 51 restrains the head A1 by the restraint surface 58 surrounded by the first joint portion 45, the second joint portion 46, the lower joint portion 57, and the outer edge airbag joint portion 36. It has become. The front main chamber 51 has a first portion formed between the lower portion of the first joint portion 45 and the lower outer airbag joint portion 36 while the upper portion thereof is in direct communication with the gas introduction portion 32. The gas flow path is communicated with the front side sub-chamber 53 directly through the communication port 61 and through the second communication port 62 formed between the upper portion of the second joint portion 46 and the gas introduction portion 32. Direct communication with 55.

  The first communication port 61 is formed to be narrowed in the vertical direction, generates a predetermined ventilation resistance, and functions as an internal vent that suppresses a rapid inflow of gas from the front main chamber 51 to the front sub chamber 53. Is. That is, by the first communication port 61, the front sub chamber 53 is configured such that no or almost no gas is introduced and does not expand at the initial stage of expansion when the front main chamber 51 and the rear main chamber 52 are inflated and deployed. Has been.

  The restraint surface 58 is elongated in the front-rear direction, and is deployed flat on the side of the head A1 of the occupant A seated on the front seat S. More specifically, the restraining surface 58 is such that the front portion 58a is positioned in front of the front portion of the head A1 with respect to the head A1 of the occupant A seated in the front seat S, and the rear portion 58b is the head portion of the head A1. It is located forward of the rear portion of A1, rearward of the front portion of head A1, and rearward of the center portion of head A1 in the front-rear direction.

  The lower joint portion 57 is spaced rearward from the first joint portion 45 and forwardly separated from the second joint portion 46, that is, the first joint portion 45 and the second joint portion 57 are separated from each other. It is arranged between the joint 46. More specifically, the lower joint portion 57 is disposed in front of the headrest S3 of the front seat S and in front of the head A1 of the occupant A seated in the front seat S. Accordingly, the head A1 of the occupant A is positioned between the lower joint 57 and the second joint 46. In other words, the lower joint portion 57 is located in front of the second joint portion 46 at a distance larger than the front and rear dimension of the head A1 of the occupant A, and is relatively far from the second joint portion 46. It is set to a far distance. The lower joint portion 57 is formed so as to protrude upward from the lower edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36). The lower joint 57 is formed in a semicircular shape, for example.

  The rear main chamber 52 restrains the head of an occupant seated in the rear seat by the development of the airbag 10 (airbag main body 33), and the front side is defined by the fourth joint 48, and the outer airbag A lower part, a rear part, and an upper part are partitioned by the joining part 36, respectively. The rear main chamber 52 has a front upper portion that is in direct communication with the gas flow path 55.

  The front sub chamber 53 suppresses an increase in internal pressure associated with the restraint of the head A1 of the occupant A in the front main chamber 51 by receiving a part of the gas introduced into the front main chamber 51, thereby suppressing the front main chamber 51. Is maintained at a stable and constant pressure. The front sub chamber 53 is divided into an upper portion, a front portion, and a lower portion by the outer edge airbag joint portion 36, and a rear portion is divided by the first joint portion 45. The front sub chamber 53 has a smaller volume than the front main chamber 51.

  The rear sub chamber 54 suppresses an increase in internal pressure accompanying restraint of the head of the occupant in the rear main chamber 52 by receiving a part of the gas introduced into the rear main chamber 52, thereby suppressing the rear main chamber 54. The chamber 52 is held at a stable and constant pressure. The rear side sub-chamber 54 is partitioned by the fourth joint portion 48 at the rear, upper portion, and upper portion of the front portion, the third joint portion 47 is partitioned at the lower side of the front portion, and an outer edge airbag joint portion. The lower part is divided by 36. The rear sub chamber 54 is partitioned at the lower part of the gas flow path 55. Further, the rear sub chamber 54 is in direct communication with the gas flow path 55 via a third communication port 63 formed between the third joint portion 47 and the fourth joint portion 48. Therefore, the rear sub chamber 54 communicates with the rear main chamber 52 via the third communication port 63 and the gas flow path 55.

  The third communication port 63 is formed by narrowing up and down narrowly, generates a predetermined ventilation resistance, and serves as an internal vent that suppresses a rapid inflow of gas from the rear main chamber 52 to the rear sub chamber 54. It functions. That is, the third communication port 63 allows the rear sub chamber 54 to not expand at all in the initial stage of expansion when the front main chamber 51 and the rear main chamber 52 are inflated and deployed. It is configured.

  The gas channel 55 introduces the gas introduced from the inflator 27 through the gas introduction part 32 into the rear main chamber 52, and the rear side extends in the front-rear direction along the upper part of the fourth joint part 48. That is, it is formed along the upper edge portion of the rear portion of the airbag main body 33, and the front side is formed between the second joint portion 46 and the third and fourth joint portions 47, 48 in the vertical direction. Yes.

  And when manufacturing the airbag 10, the base fabric is joined by sewing etc. by the outer edge airbag joining portion 36, the first to fourth joining portions 45 to 48, and the lower joining portion 57, respectively. The airbag 10 having the airbag main body 33 including the main chambers 51 and 52 and the sub chambers 53 and 54 and the gas introduction unit 32 is completed. In this state, the gas injection side of the inflator 27 is inserted into the insertion opening 38 of the gas introduction part 32, and the inflator 27 is integrally fixed in a state of being exposed to the outside from the airbag 10.

  Further, the airbag body 33 can be rolled up while being folded into a roll shape, etc., and the airbag 10 can be folded into a predetermined elongated shape, and can be released or broken by the pressure when the airbag 10 is deployed using a sleeve (not shown). Hold the folded shape so that In this manner, the airbag 10 is folded into an elongated shape and the folded shape is maintained, and the airbag apparatus 11 serving as a curtain airbag module is configured.

  Then, the airbag device 11 including the airbag 10 folded as described above is brought into the vehicle compartment 14, and the attachment work to the vehicle body is performed before the interior materials such as the head lining and the pillar garnish are attached. This attaching operation is performed by attaching and fixing the plurality of attaching portions 34 and the tether belt 29 of the airbag 10 to the vehicle body using a fixing tool such as a bolt (not shown). The inflator 27 is fixed at a position corresponding to the upper side of the center pillar 22. Further, the harness derived from the inflator 27 is connected to a control device provided in the vehicle body. Next, the headlining is attached to the ceiling panel of the vehicle body to cover the airbag device 11, and the pillar garnish is attached to each of the pillars 21, 22, and 23, and the operation of attaching the airbag device 11 to the vehicle body is completed. In this attached state, the airbag device 11 is isolated from the interior of the passenger compartment 14 by the headlining and the pillar garnish, and the inflator 27 inserted into the gas introduction unit 32, and the airbag main body 33 folded into a roll shape, Is held in a position above the pillar garnish.

  In the event of a side collision or rollover including an oblique collision of the vehicle (collision from obliquely forward), the inflator 27 is activated by the control device, and the gas injected from the inflator 27 expands the gas introduction part 32. After that, the air bag main body 33 is introduced into the air bag main body 33, and the air bag main body 33 is inflated and deployed downward along the predetermined surface 24 on the side of the vehicle compartment 14 to protect the occupant.

  More specifically, when gas is supplied to the airbag 10 at the gas introduction unit 32, the gas introduced from the gas introduction unit 32 is transferred from the front main chamber 51 and the gas flow channel 55 to the rear main chamber 52. Divided back and forth and supplied. Therefore, the airbag main body 33 is deformed so that the front main chamber 51, the gas flow passage 55, and the rear main chamber 52 are expanded while being expanded to push the lower end portion of the head lining toward the interior of the vehicle compartment 14. Then, the pillar garnish projects from the upper end of the pillar garnish into the passenger compartment 14 and develops downward along the predetermined surface 24. Gas is supplied to the front sub chamber 53 from the first communication port 61 via the front main chamber 51, and gas is supplied to the rear sub chamber 54 from the third communication port 63 via the gas flow path 55. The front sub chamber 53 and the rear sub chamber 54 are also expanded and expanded.

  The front main chamber 51 includes a first joint portion 45, a second joint portion 46, a lower joint portion 57, and an outer edge airbag joint portion 36. A constraining surface 58 is formed between the vehicle body and the vehicle body. At this time, the constraining surface 58 is positioned so that the second joint portion 46 faces the side portion of the headrest S3 of the front seat S, so that the rear portion 58b is flat to the vicinity of the side rear end of the head A1 of the occupant A. And the gap between the side portion of the head A1 of the occupant A and the restraint surface 58 is suppressed, and the lower joint portion 57 suppresses the volume of the front main chamber 51 at the position in front of the side portion of the head A1. Thus, the front portion 58a is flattened to the front of the head A1.

  Specifically, as a comparative example, the second joint 46 is compared with FIG. 2 (b) showing the restraining surface 58p1 of the front main chamber 51p1 of the airbag 10p1 positioned in front of the headrest S3. In the case of the constraining surface 58 of the present embodiment shown in a), the rear portion 58b extends more flat to the rear, and the gap with the head A1 is suppressed. Further, as another comparative example, the present embodiment shown in FIG. 2 (a) is compared with FIG. 2 (c), which shows the restraining surface 58p2 of the front main chamber 51p2 of the airbag 10p2 that does not include the lower joint portion 57. In this case, by restricting the width of the front main chamber 51 at the position on the front side of the side portion of the head A1, the front portion 58a extends more flatly to the front.

  As a result, the flat portion (protection area) of the restraint surface 58 extends widely in the front-rear direction, and the entire head A1 of the occupant A moving by being thrown obliquely forward by an oblique collision is moved to the front main chamber 51 (restraint surface). 58), the rotation in the vertical axis direction is suppressed such that the front part of the head A1 is rotated to the anti-airbag 10 side and the rear part of the head A1 is rotated to the airbag 10 side.

  Further, the front main chamber 51 is shown in FIG. 3 (a) in comparison with FIG. 3 (b) in which the front main chamber 51p3 of the airbag 10p3 is regulated to a predetermined width by using a tether as another comparative example. In the case of the present embodiment, the left and right widths can be sufficiently maintained depending on the positions of the second joint portion 46 and the lower joint portion 57 (FIG. 1), and the left and right width can be made larger than the side airbag 26. The time difference until the timing of restraining the head A1 by the airbag 10 is less likely to occur with respect to the timing of restraining the body of the occupant A by the side airbag 26, and rotation in the front-rear axis direction is suppressed. The front main chamber 51 is pressed in the width direction by the restraint of the head A1 of the occupant A, so that part of the gas gradually flows into the front sub chamber 53 through the first communication port 61, Maintain appropriate internal pressure.

  Further, in the rear main chamber 52, the head of the passenger seated in the rear seat is restrained and protected. The rear main chamber 52 is pressed in the width direction by the restraint of the head of the occupant, so that a part of the gas is transferred from the gas flow path 55 to the rear sub chamber 54 via the third communication port 63. And gradually flow in to maintain an appropriate internal pressure.

  Thus, the second joint formed in a straight line along the vertical direction without a bent portion at a position facing the side portion of the headrest S3 of the front seat S arranged at a predetermined position and angle determined in advance. By dividing the rear portion of the front main chamber 51 by the portion 46, for example, the front seat S can be used without using other members such as a base fabric or special equipment for manufacturing, or changing the output of the inflator 27. The rear side of the head A1 of the occupant A seated on the head can be restrained by the front main chamber 51 (restraint surface 58), and the rotation of the head A1 in the vertical axis direction can be suppressed, and the occupant A's head can be controlled with an inexpensive configuration A1 can be restrained more effectively.

  Further, the front lower portion of the front main chamber 51 is defined by a lower joint portion 57 formed at a position in front of the head A1 of the occupant A seated in the front seat S, so that the head of the occupant A seated in the front seat S The front side of A1 is controlled not to be positively restrained by the front main chamber 51, so that the rotation of the head A1 in the vertical axis direction can be suppressed, and the head A1 of the occupant A can be more effectively restrained.

  That is, in the front main chamber 51, the restraint surface 58 that restrains the head A1 of the occupant A extends in the front-rear direction in a flat shape only by the arrangement of the second joint 46 and the lower joint 57. In addition, since the width can be sufficiently secured, the rotation of the head A1 of the occupant A can be suppressed with an inexpensive configuration, and the brain injury value of the occupant A caused by the rotation can be further suppressed.

  In the first embodiment described above, for example, as in the second embodiment shown in FIG. 6, the lower joint portion 57 is formed in a linear shape in the same manner as the first to fourth joint portions 45 to 48. Even if the circular protective portion 57a is formed at the tip, the same effect can be obtained. That is, the lower joint portion 57 is not limited to a predetermined shape as long as the position is maintained.

  Further, in each of the embodiments described above, the airbag 10 is a curtain airbag that is deployed downward from the roof side portion along the predetermined surface 24.For example, the airbag 10 is deployed upward from the upper portion of the door. It can also be used as a so-called door mount airbag.

  The present invention can be applied to, for example, an airbag and an airbag apparatus that protects an occupant by being attached and deployed along a side window of an automobile.

10 airbag
24 Predetermined surface
33 Airbag body
46 Second joint which is a non-expandable part
51 Front main room
57 Lower joint that is the front non-inflatable part A Crew A1 Head S Front seat that is the seat S3 Headrest

Claims (2)

An airbag including an airbag body portion that is formed in a bag shape, is supplied with gas from a folded state, expands along a predetermined surface on the side of a seat in a vehicle compartment, and expands in the vehicle width direction. ,
The airbag body is
A non-inflatable portion formed in a straight line along the vertical direction without a bent portion at a position facing the side portion of the headrest of the seat arranged at a predetermined position and angle determined in advance;
An air bag comprising: a rear portion defined by the non-inflatable portion; and an air chamber that restrains an occupant's head seated on the seat. 2. The airbag according to claim 1, wherein the airbag main body includes a front non-inflating portion that partitions a front lower portion of the air chamber at a position in front of a head of an occupant seated in the seat.

Images