JP2017001658A - Curtain airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curtain airbag device capable of reducing the size of an airbag body and extending a rear row inflation part of the airbag body below a belt line at the time of inflation.SOLUTION: A facilitation part (26, 26', 26"), which is formed of a non-inflation part of an airbag body (21, 21', 21") and facilitates folding of the airbag body (21, 21', 21") at the time of inflation of the airbag body (21, 21', 21"), is provided in at least one air chamber (35 g) disposed at a lower end part of the airbag body (21, 21', 21") in a curtain airbag device (10). The air chamber (35g) comprising the folding facilitation part (26, 26', 26") has a flow passage through which gas circulates so as to go around the facilitation part (26, 26', 26") from one direction side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a curtain airbag device in which an airbag is inflated and deployed in a curtain shape along a side window portion of a vehicle body.

  2. Description of the Related Art In recent years, a curtain airbag device having a curtain airbag that inflates and deploys along a side window portion of a vehicle body in a vehicle interior in order to protect an occupant's head in an accident such as a side collision of a vehicle or a rollover. It is installed in many cars.

  Normally, in a curtain airbag device, when an accident such as a side collision or rollover is detected on a vehicle, or when such an accident is predicted, an inflating gas is generated from an inflator to generate a curtain airbag. By supplying it into the bag, the curtain airbag is inflated and deployed in a curtain shape instantly in the passenger compartment. Thereby, the passenger | crew's head can be protected by the inflating part of a curtain airbag, and a passenger | crew's safety can be ensured.

An invention relating to such a curtain airbag device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2012-201312 (Patent Document 1).
As shown in FIG. 10, the curtain airbag device 60 described in Patent Document 1 includes a curtain airbag 70 and an inflator 61 that generates gas and supplies the gas into the curtain airbag 70.

  The curtain airbag 70 of Patent Literature 1 includes an airbag main body 71 that is inflated when supplied with gas, and a plurality of attachment pieces 72 that are attached to the upper end of the airbag main body 71. Such a curtain airbag 70 is configured to fix each attachment piece 72 to the vehicle body 80 using a fixing member such as a bolt in a state in which the airbag main body 71 is folded, from the front pillar 81 of the vehicle body 80. It is accommodated over the range up to the vicinity of the rear pillar 83 through the roof side portion 82.

  The airbag main body 71 in the curtain airbag 70 includes a main inflating portion (main chamber) 73 that inflates and deploys in the head protection area, and front and rear side sub-inflations that communicate with the main inflating portion 73 through the reduced diameter portion. Parts (sub chambers) 74a and 74b. The main expansion portion 73 includes a front main expansion portion 73a for the front seat, a rear main expansion portion 73b for the rear seat, and the front main expansion portion 73a and the rear main expansion portion 73b along the roof side portion 82. And a gas supply passage 73c as a gas flow path communicating with each other.

  In particular, in the curtain airbag 70 of Patent Document 1, in a side view, a belt line (also referred to as a trim line) drawn by the lower edge of the side window so that the front main inflating portion 73a of the airbag body 71 overlaps the center pillar 84 is overlapped. It is formed so as to be developed in a cylindrical shape extending in the vehicle longitudinal direction on the upper side.

  The front sub-inflatable portion 74a is disposed on the front side of the main inflatable portion 73 so that the lower end portion of the front sub-inflatable portion 74a extends below the belt line in a side view so as to overlap the front side door and expand. Yes. The rear sub-expansion part 74b is located between the front main expansion part 73a and the rear main expansion part 73b on the lower side of the gas supply passage 73c. It is arranged so as to extend downward and overlap with the rear side door and deploy.

  According to Patent Document 1, in the event of a side collision of the vehicle, the main inflating portion 73 of the curtain airbag device 60 is deployed by receiving a gas supply and can protect the occupant's head against the side collision. When the vehicle rolls over, the main inflatable portion 73 and the front and rear sub-inflatable portions 74a and 74b are deployed to move the occupant's head outward in the vehicle width direction over a wide range in the vehicle longitudinal direction. The head can be protected by restricting.

  In particular, in Patent Document 1, the front main expansion portion 73a is supported by the center pillar 84 during rollover, and the front and rear sub expansion portions 74a and 74b are supported by side doors below the belt line. A reaction force that restricts the movement of the occupant head to the outside in the vehicle width direction is effectively obtained, and the protection performance of the occupant head is improved.

JP 2012-201312 A

  In the curtain airbag device 60 of Patent Document 1, the airbag main body 71 includes a front side door and a rear side door in which the lower ends of the front and rear auxiliary inflating portions 74a and 74b extend below the belt line in a side view. Are formed so as to overlap each other. As a result, when the airbag body 71 is inflated and deployed due to a rollover or the like of the vehicle, the front side and rear side secondary inflatable portions 74a and 74b are supported by the side doors below the belt line as described above. Since the force is obtained, the head of the occupant can be safely protected by the curtain airbag 70, and the occupant can be reliably prevented from being released from the vehicle.

  However, if the curtain airbag (airbag body) is formed in such a large size as to extend downward beyond the belt line even when gas is not supplied to the interior, the base fabric panel forming the airbag body The size of itself will inevitably increase. At the same time, inflating such a large airbag body requires the use of an inflator having a large output. As a result, the cost of the curtain airbag device is increased, and the size and weight of the device are increased.

  The present invention has been made in view of the above-described conventional problems. The object of the present invention is to reduce the size and weight of the apparatus by reducing the size of the airbag body, and at the time of inflation and deployment of the airbag body. By extending the inflated part of the bag body below the belt line and overlapping the side door (door trim), the reaction force when the head of the occupant contacts the curtain airbag can be effectively obtained. It is an object of the present invention to provide a possible curtain airbag device.

  In order to achieve the above object, a curtain airbag device provided by the present invention basically includes an inflator that generates gas and a side window portion of a vehicle body that is folded in a predetermined procedure. A curtain airbag attached along an upper edge, wherein the curtain airbag has an airbag body that is inflated when the gas is supplied from the inflator, and the airbag body is moved to the side by the generation of the gas. A curtain airbag device that inflates and deploys downward in a curtain shape so as to cover the vehicle interior side of the side window portion, wherein the airbag body introduces the gas into the airbag body, and A main passage portion that communicates with the gas introduction portion and distributes the gas; and a plurality of air chambers that communicate with the main passage portion, and the airbag body includes at least A rear row side window formed by one air chamber and formed by at least one air chamber and a front row expansion portion that can be inflated and deployed corresponding to the position of the front row side window portion of the vehicle body. A rear row inflatable portion that can be inflated and deployed corresponding to the position of the portion, and at least one of the air chambers arranged at the lower end of the airbag body comprises a non-inflatable portion of the airbag body, A folding facilitating portion is provided to urge the airbag body to bend when the airbag body is inflated and deployed, and the folding facilitating portion is provided between the front end portion and the rear end portion of the rear row side window portion in the front-rear direction of the vehicle body. The air chamber having the folding promoting portion provided corresponding to the position of the gas flow path has a flow path through which the gas flows around the folding promoting portion in one direction. To do.

  In the curtain airbag device according to the present invention, the lower end edge of the rear row inflatable portion is the rear row side window portion when the curtain airbag is attached to the vehicle body and spread without supplying the gas. The lower end position of the rear row side window portion is arranged at the same position as or above the lower end position of the airbag, and the airbag body is bent starting from the folding promoting portion when inflated and deployed. It is preferable to displace downward.

In the curtain airbag device of the present invention, it is preferable that the folding promoting portion is provided by partially dividing the air chamber including the folding promoting portion into upper and lower portions.
In the present invention, the folding promoting portion is an outer peripheral non-inflatable portion provided on the outer peripheral portion of the airbag main body by a sewing line for sewing the base fabric panels forming the airbag main body in a curved shape and / or a linear shape. It is preferable to have a linear non-expandable portion formed extending from the lower edge portion upward or obliquely rearward and upward.

Furthermore, in the curtain airbag device of the present invention, it is preferable that the air chamber disposed at the lower end portion and provided with the folding promoting portion communicates with another air chamber adjacent to each other via a throttle portion.
In this case, it is preferable that the folding promoting part is arranged behind the throttle part of the air chamber in the front-rear direction of the vehicle. Moreover, it is preferable that the said folding promotion part is distribute | arranged below the said throttle part of the said air chamber in the up-down direction of a vehicle.
Moreover, it is preferable that the lower end of the air chamber provided with the folding promoting portion is disposed at a height at which the throttle portion side is higher than the downstream side with respect to the folding promoting portion.

  The airbag main body in the curtain airbag of the curtain airbag device according to the present invention includes a gas introduction part that introduces gas into the interior, a main flow path part that communicates with the gas introduction part and distributes the gas, and communicates with the main flow path part. And a plurality of air chambers. In particular, the airbag body is formed by at least one air chamber, and is formed by a front row inflatable portion that can be inflated and deployed corresponding to the position of the front row side window portion of the vehicle body, and at least one air chamber. A rear-row inflatable portion corresponding to the position of the rear-row side window portion.

  Further, in the rear row inflatable portion, the at least one air chamber arranged at the lower end portion of the airbag main body includes a non-inflatable portion of the airbag main body, and a fold promoting portion that promotes the folding of the airbag main body when inflated and deployed. Is provided. In this case, the folding promoting portion is provided corresponding to the position between the front end portion and the rear end portion of the rear row side window portion in the front-rear direction of the vehicle body. A flow path is formed in which the gas circulates around the folding promoting portion from the upper side to the rear side, for example.

  In the curtain airbag device of the present invention having the curtain airbag provided with such a folding promoting portion, when the airbag body is inflated and deployed by supplying gas to the airbag body, In the air chamber provided with the folding promoting portion, for example, gas flows so as to wrap around in one direction from the upper side of the folding promoting portion toward the rear of the folding promoting portion, and the rear side of the folding promoting portion is expanded.

  As a result, inflation pressure is generated in the airbag body, and the folding promotion portion and its peripheral portion are partially lifted, and the latter half portion of the airbag body is bent downward more greatly from the folding promotion portion as a starting point. The force works and the airbag body can be folded into a bow shape. Then, by folding the airbag body in this way, the rear lower end portion of the airbag body can be positively displaced so as to rotate downward while pulling forward.

  Therefore, for example, even if a curtain airbag is formed by reducing the size of the airbag body so that the lower end edge of the rear side of the inflated portion of the airbag body is arranged above the belt line, the curtain airbag is inflated. When deployed, the inflatable portion of the airbag body can extend below the belt line and overlap the side door (door trim). As a result, the inflatable portion of the airbag body is supported by a side door disposed below the side window portion, so that a reaction force can be effectively obtained. While protecting safely, a passenger | crew's discharge | release outside a vehicle can be prevented reliably.

  In particular, the airbag main body of the present invention has the same position as the lower end position of the rear row side window when the lower end edge of the rear row inflatable portion is spread without supplying gas with the curtain airbag attached to the vehicle body. It is formed in such a small size that it is arranged above or below the lower end position.

  By reducing the size of the airbag body in this way, the size of the base fabric panel forming the airbag body can be reduced, and the output of the inflator that supplies gas to the airbag body can be reduced. For this reason, the curtain airbag device can be reduced in size and weight, and the manufacturing cost can be reduced.

  And as described above, even when the size of the airbag body is reduced so that the lower end edge of the rear row inflating portion is arranged at the same position as the lower end position of the rear row side window portion or above the lower end position, When the curtain airbag is inflated and deployed, the airbag body is bent starting from the folding promoting portion, so that the rear row inflatable portion extends below the lower end position of the rear row side window portion. The rear row inflatable portion can be surely overlapped with the side door by being displaced, whereby the airbag body is supported by the side door and the reaction force from the side door is stably and effectively obtained. be able to.

  In such a curtain airbag device of the present invention, the folding promotion portion of the airbag body is provided by partially dividing the air chamber provided with the folding promotion portion vertically. Thus, when the airbag body is inflated and deployed, the upper portion and the lower portion of the air chamber divided by the folding promotion portion are inflated in the vehicle width direction, respectively, so that the folding promotion portion of the airbag body is provided. The lower end edge of the portion being pulled is pulled upward, and is lifted relatively higher than the position of the lower end edge of the other portion where the folding promoting portion of the airbag body is not provided.

  Thus, by lowering the lower end edge of the portion of the airbag body where the folding promoting portion is provided relatively upward, the airbag body can be folded into a larger bow shape, and as a result, The inflatable part of the air bag body can be extended to the lower side of the belt line so that the inflated part of the air bag body can be more reliably overlapped with the side door of the vehicle body. It is possible to secure a larger area where the two overlap.

  In the present invention, the folding promotion portion of the curtain airbag is an outer peripheral non-inflatable portion provided on the outer peripheral portion of the airbag body by a sewing line that stitches the base fabric panels forming the airbag body in a curved shape and / or a straight line. It is comprised by the linear non-expanded part formed extending from the lower edge part upward or diagonally back upward. Since the folding promoting portion is configured by such a linear non-inflatable portion, the airbag body that is inflated and deployed can be stably folded starting from the folding promoting portion.

  In the curtain airbag device of the present invention, the air chamber provided at the lower end portion of the airbag body and provided with the folding promoting portion communicates with another adjacent air chamber via the throttle portion. Thereby, when an airbag main body expand | swells, an air chamber provided with a folding promotion part can be inflated later than the other air chamber adjacent to it, and can be made into a low-pressure state. Thereby, for example, when an occupant comes into contact with the other air chamber, the gas in the other air chamber can be released to the air chamber provided with the folding promoting portion, and as a result, the occupant receives from the airbag body. The reaction force can be effectively reduced. Furthermore, the air chamber provided with the folding promoting portion can be confined without letting gas escape to the outside. For this reason, after the occupant comes into contact with the airbag body, the internal pressure of the air chamber having the folding promoting portion and the other air chambers adjacent to the air chamber are stably maintained at a certain level or larger, and the occupant is kept for a certain time. It can be protected more safely.

  In this case, since the folding promoting portion is arranged behind the throttle portion of the air chamber in the front-rear direction of the vehicle, the airbag body is effective from the folding promoting portion when the airbag body is inflated and deployed. Can be folded into a bow.

  Further, since the folding promoting portion is arranged below the throttle portion of the air chamber in the vertical direction of the vehicle, the flow of gas that has passed through the restricting portion is not inhibited by the folding promoting portion. It can be efficiently distributed from the upper side toward the rear or lower side of the folding promoting portion.

  Further, with respect to the lower end of the air chamber provided with the folding promoting portion, the lower end on the throttle portion side (upstream side) with respect to the folding promoting portion is located above the lower end on the downstream side with respect to the folding promoting portion. Deploy. By forming the sewing line at the lower end of the air chamber in this way, it becomes easy to arrange the folding promoting portion below the throttle portion. Moreover, it becomes easy to ensure a large lower area or rear area of the folding promoting portion. Thereby, the circulation of the gas can be stabilized and the airbag body can be bent more effectively.

It is a side view which shows the state which the curtain airbag which concerns on embodiment of this invention was attached to the vehicle body, and opened without supplying gas. It is a side view of the curtain airbag before being attached to a vehicle body. It is a principal part enlarged view which expands and shows the part by which the attachment piece in the curtain airbag is sewn on the airbag main body. It is sectional drawing in the IV-IV line shown in FIG. It is a principal part enlarged view which shows the modification of the sewing line which sew an attachment piece to an airbag main body. It is sectional drawing which showed the state when a curtain airbag expand | swells in the cross section in the VI-VI line shown in FIG. It is a side view which shows the state which gas was supplied to the curtain airbag and inflate-deployed. It is a side view of the curtain airbag which concerns on the modification of embodiment. It is a side view of the curtain airbag which concerns on another modification of embodiment. It is a side view which shows the conventional curtain airbag.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment at all, It has the structure substantially the same as the structure described in the claim of this invention, and the range which show | plays the same effect. Various changes can be made.

  For example, the form of the vehicle body on which the curtain airbag device of the present invention is mounted is not particularly limited, and the shape of the inflated portion formed in the airbag body of the curtain airbag and the base fabric panel are sewn. The shape or the like of the sewing portion can be arbitrarily changed according to the form of the vehicle body. In the following embodiments, a curtain airbag device attached to a two-row seat car will be described. However, the curtain airbag device of the present invention is similarly applied to a one-row seat car and a three-row seat car. Can be applied. The airbag may be manufactured by sewing a fabric, or by using a bag weaving technique such as jacquard weaving to obtain a bag body having a desired internal partition structure at the same time as weaving.

FIG. 1 is a side view showing a state in which a curtain airbag according to the present embodiment is attached to a vehicle body, and an airbag body is deployed without supplying gas. FIG. 2 is a side view when the curtain airbag is unfolded before being attached to the vehicle body.
In the following description, the front-rear direction, the up-down direction, and the left-right direction indicate the vehicle length direction (forward and backward directions), the vehicle height direction, and the vehicle width direction of the vehicle body on which the curtain airbag device is mounted, respectively. Yes.

  The curtain airbag device 10 of the present embodiment includes a curtain airbag 20 and an inflator 11 that generates gas to be supplied to the curtain airbag 20.

  The curtain airbag 20 is stored in a range from the upper part of the front pillar (A pillar) 2 in the vehicle body 1 to the vicinity of the rear pillar (C pillar) 4 through the roof side part 5 in a folded state according to a predetermined procedure. Along the front and rear side windows 6 and the center pillar (B pillar) 3 so as to cover the vehicle interior side of the side windows (side windows) 6 for the front and rear seats. It is formed so as to expand in a curtain shape. The inflator 11 is disposed on the roof side portion 5, and a gas outlet of the inflator 11 is inserted into an airbag main body 21 described later of the curtain airbag 20.

  In addition, the vehicle on which the curtain airbag device 10 of the present embodiment is mounted includes a front seat and a rear seat (not shown) in which a passenger can be seated. As the portion 6, a front row side window portion 6F and a rear row side window portion 6R are provided corresponding to the positions of the front seat and the rear seat. The vehicle body 1 of the automobile includes a front pillar 2 disposed along a windshield (not shown) of the vehicle body 1, a rear pillar 4 disposed at a rear portion of the vehicle body 1, and a center disposed between the front pillar 2 and the rear pillar 4. The roof side part 5 is arranged over the upper end part of each of these pillars 2, 3, 4.

  The curtain airbag 20 of the curtain airbag device 10 includes an airbag main body 21 that is inflated when supplied with gas, a plurality of attachment pieces 22 that attach the airbag main body 21 to the vehicle body 1, and one end portion of which is a front end of the airbag main body 21. And a dither belt (also referred to as a tension strap) 23 that is sewn to the front pillar 2 and the other end is fixed to the front pillar 2, and a sleeve (not shown) that covers the folded airbag body 21 and holds the folded form. In addition, the dither belt 23 and the sleeve in the curtain airbag 20 of the present embodiment are formed in substantially the same manner as the dither belt and the sleeve provided in the conventional general curtain airbag.

The airbag main body 21 of the present embodiment is elongated in the front-rear direction by overlapping and sewing the right and left base fabric panels 24 (the vehicle interior side base fabric panel 24a and the vehicle exterior base fabric panel 24b). It is formed in a substantially rectangular shape. The vehicle interior side base fabric panel 24a and the vehicle exterior base fabric panel 24b in the airbag body 21 are made of a woven fabric having a basis weight of 200 g / m ² woven using, for example, 315 denier nylon 66 yarn. Furthermore, the panel surface is coated with a resin such as rubber or silicone elastomer resin. In the present invention, the material and the like of the base fabric panel are not particularly limited, and can be changed as appropriate.

  As shown in FIGS. 1 and 2, the airbag main body 21 of the present embodiment includes a hollow inflatable portion 30 that is supplied with gas and can be inflated and deployed, and an upper end portion of an intermediate portion in the front-rear direction of the airbag main body 21. And a gas introduction portion 21a communicating with the gas outlet of the inflator 11, and an outer peripheral non-inflatable portion 40 formed on the outer peripheral portion of the airbag main body 21 excluding the introduction port of the gas introduction portion 21a. In this case, the outer peripheral non-inflatable portion 40 of the airbag body 21 is formed by being partitioned from the inflatable portion 30 by an outer peripheral sewing line 41 for sewing the outer peripheral edge portions of the left and right base fabric panels 24. The part 30 is hermetically sealed by an outer peripheral sewing line 41.

  The inflatable portion 30 of the airbag body 21 includes a front row inflatable portion 31 that can be inflated and deployed corresponding to the position of the front row side window portion 6F, and a rear row that can be inflated and deployed corresponding to the position of the rear row side window portion 6R. A communication part (main flow path part) 33 that is arranged on the upper part of the airbag main body 21, communicates with the gas introduction part 21a, and communicates between the front-row and rear-row expansion parts 31, 32; An intermediate expansion portion 34 is provided below the communication portion 33 and can be expanded and deployed along the center pillar 3.

  The inflatable portion 30 of the airbag body 21 has seven air chambers 35a to 35g by sewing lines for sewing the left and right base fabric panels 24 different from the outer peripheral sewing line 41. The first air chamber 35 a to the seventh air chamber 35 g communicate directly or indirectly with the communication portion (main flow passage portion) 33. In addition, the sewing line which divides each air chamber 35a-35g is formed as the non-expanding part 42, The expansion part 30 in the left-right direction when the expansion part 30 expand | swells by the non-expanding part 42 by this sewing line. The width dimension (thickness) is regulated.

  In this case, the non-expandable portion 42 is formed of a linear non-expandable portion 42a composed of a curve or a combination of a straight line and a curve so as to define the expandable portion 30, and the expandable portion 30 at the tip of the linear non-expandable portion 42a. And an annular non-expandable portion 42b formed in a circular shape (closed curve shape).

  The first air chamber 35 a in the inflating part 30 of the present embodiment is arranged on the most front end side of the inflating part 30 from the upper end to the lower end of the inflating part 30. The second and third air chambers 35b and 35c are sequentially formed on the rear side of the first air chamber 35a from the upper end to the lower end of the inflating portion 30. The fourth air chamber 35d is disposed on the rear side of the upper end portion of the third air chamber 35c, and forms the communication portion 33 of the expansion portion 30.

  The fifth air chamber 35e is disposed below the fourth air chamber 35d. The sixth air chamber 35f is arranged from the rear end of the fourth air chamber 35d to the rear end of the inflating portion 30, and is formed from the upper end to the lower end of the inflating portion 30 at the rear end of the inflating portion 30. Has been. The seventh air chamber 35g is disposed on the rear side of the fifth air chamber 35e, surrounded by the fifth air chamber 35e and the sixth air chamber 35f, and is supplied to the expansion unit 30 from the gas introduction unit 21a. Is formed so as to flow from the fifth air chamber 35e through the space between the two annular non-expandable portions 42b.

  In this case, in the expansion portion 30 of the present embodiment, the front row expansion portion 31 arranged corresponding to the position of the front row side window portion 6F is formed by the first air chamber 35a to the third air chamber 35c. . In particular, the main expansion portion of the front row expansion portion 31 is formed by the second and third air chambers 35b and 35c. In addition, the first air chamber 35a allows the sub-expansion portion (first air chamber) 35a of the front row expansion portion 31 to communicate from the second air chamber 35b of the main expansion portion via the narrow flow passage (throttle flow passage 101). Is formed.

  Further, the rear row expansion portion 32 arranged corresponding to the position of the rear row side window portion 6R is formed by the sixth air chamber 35f and the seventh air chamber 35g, and in particular, the rear row by the sixth air chamber 35f. A main expansion portion of the expansion portion 32 for use is formed. The seventh air chamber 35g forms a sub-expansion portion (seventh air chamber) 35g of the rear-row expansion portion 32 that communicates with the fifth air chamber 35e through a narrow flow passage (throttle flow passage 102). .

  The intermediate expansion portion 34 that expands and expands along the center pillar 3 is formed by a fifth air chamber 35e. The sub-expansion part (first air chamber) 35a of the front-row expansion part 31 and the sub-expansion part (seventh air chamber) 35g of the rear-row expansion part 32 pass through the throttle channels 101 and 102 when the passenger is restrained. It is provided to alleviate the impact that the occupant receives from the inflating portion 30 by letting the gas escape.

  That is, the gas supplied from the inflator 11 expands the fourth air chamber 35d, and further proceeds to expand the fifth air chamber 35e. In this case, the passage 100 that connects the two adjacent fourth fourth chambers 35d and 35e has a sufficient width, and the gas flow is relatively smooth. For this reason, the fourth air chamber 35d and the fifth air chamber 35e are inflated immediately after the airbag device is activated.

  On the other hand, in the seventh air chamber 35f communicating with the fifth air chamber 35e, the gas inflow is regulated by the narrow throttle channel 102, and the gas flow in the throttle passage 102 is the same as that of the fourth air chamber 35d and the fifth air chamber. It is not as easy as gas distribution in the passage 100 between 35e. For this reason, at the early stage of deployment of the curtain airbag 20, the seventh air chamber 35g is not inflated so much as the fifth air chamber 35e is inflated firmly.

  Therefore, when a side collision occurs and the occupant comes into contact with the fifth air chamber 35e of the airbag main body 21, the fifth air chamber 35e is pushed by the occupant, and the gas inside thereof flows to other than the fifth air chamber 35e. Try to. The fifth air chamber 35e is at a position where the contact of the occupant seated in such a case is expected. Since the seventh air chamber 35g is not in such a position and is in a relatively low pressure state that is not so expanded, there is a room for receiving a considerable amount of gas via the throttle channel 102. For this reason, the seventh air chamber 35g communicating with the fifth air chamber 35e has an effect of cutting off the bounce peak in the fifth air chamber 35e. In other words, the movement of the occupant can be quickly and gently stopped without causing the occupant in contact with the fifth air chamber 35e to rebound, and the shock received by the occupant when hitting the vehicle interior wall can be mitigated.

  Some conventional typical driver-seat airbags are provided with vent holes, which are small holes that open to the outside of the bag. In the air bag in which the vent hole is formed, the gas in the bag is almost released to the atmosphere soon after the occupant is restrained, and the bag is deflated. On the other hand, in the side curtain airbag 20 of the present embodiment, the seventh air chamber 35g is a closed air chamber that does not have a passage opened to the outside.

  Therefore, even after the internal pressure peak at the time of occupant contact with the fifth air chamber 35e is lowered by letting the gas escape to the seventh air chamber 35g, the seventh air chamber 35g can freely release the internal gas to the atmosphere. There is no. For this reason, it is not necessary for the fifth air chamber 35e to rapidly decrease in internal pressure, and it is possible to stably maintain an internal pressure of a certain level or more for a considerable time, for example, for several seconds. This is extremely effective in the case of a side collision.

  This is because in a side collision, the vehicle may roll over after receiving the first impact, and the internal pressure can be maintained without being completely deflated for several seconds after the airbag device is activated. This is because the passenger can be protected during that time. Such a sub-expansion chamber is sometimes called an internal vent in the sense that it can be incorporated into an airbag to adjust the internal pressure.

  The relationship between the fifth air chamber 35e and the seventh air chamber 35g described above is similarly established between the first air chamber 35a and the second air chamber 35b. Moreover, the effect of cutting off the bound peak by the sub-expansion part (seventh air chamber) 35g and the effect of maintaining the internal pressure are not only when the occupant contacts the fifth air chamber 35e, but also when the gas flows smoothly. The same can be obtained when an occupant comes into contact with the six air chambers 35f.

  The rear row inflatable portion 32 of the airbag main body 21 has the lower end edge of the rear row inflatable portion 32 at the same position as the belt line 7 when the curtain airbag 20 is attached to the vehicle body 1 without being supplied with gas. The rear row inflatable portion 32 has a dimension that does not exceed the belt line 7 so as to be disposed above the belt line 7, and when the curtain airbag 20 is inflated and deployed, A folding promoting portion that promotes the folding of the airbag main body 21 when the curtain airbag 20 is inflated and deployed so that the rear row inflatable portion 32 overlaps the side door (door trim) on the rear row side beyond the belt line 7 (details will be described later). 26 is provided.

  The folding promoting portion 26 is formed by a different sewing line 103 different from the sewing line (non-inflatable portion 42) that divides each air chamber, and a seventh portion arranged at the lower end portion of the airbag body 21. It is provided in the air chamber 35g (the rear row expansion portion 32).

  In this case, the seventh air chamber 35g is formed so that a part of the sewing line 103 (a non-expanded part 104 described later) extends obliquely rearward and upward from the lower side part of the outer peripheral sewing line 41. In addition, there is a flow path through which the gas flows around the sewing line 103 through the upper side of the sewing line 103 to the rear of the folding promoting portion 26 and further flows from the rear of the sewing line 103 to the lower side of the sewing line 103.

  Furthermore, the sixth air chamber 35f has a flow path through which the gas flows so as to flow around the rear of the seventh air chamber 35g through the upper side of the seventh air chamber 35g. An inflating part that inflates due to the above is disposed adjacent to the upper and rear of the seventh air chamber 35g.

  When the curtain airbag 20 is attached to the vehicle body 1 via a plurality of attachment pieces 22 and spreads in a plane without supplying gas, the folding promoting portion 26 of the curtain airbag 20 Is provided corresponding to the position between the front end portion and the rear end portion of the rear row side window portion 6R in the direction, and more preferably, between the front end portion of the rear row side window portion 6R and the central portion in the front-rear direction. It is provided corresponding to the position between.

  In particular, the sewing line 103 as the folding promoting portion 26 is used to fold the airbag body 21 as will be described later when the curtain airbag 20 is inflated and deployed (see FIG. 7). It is preferably arranged in the vicinity of the front side of the portion to be overlapped with the rear door side door trim, and in the vicinity of the position where the head of the rear passenger is in contact with the inflated and deployed curtain airbag 20 (spot position) It is preferable that it is arranged.

  The folding promoting portion 26 in the present embodiment includes a linear non-expanding portion 26 a and an annular non-expanding portion 26 b formed in the seventh air chamber 35 g by the sewing line 103 of the base fabric panel 24. Further, the linear non-expanding portion 26a of the folding promoting portion 26 is directed from the lower side portion of the outer peripheral sewing line 41 of the base fabric panel 24 (or the lower end portion of the outer peripheral non-expanding portion 40) into the seventh air chamber 35g. A first linear non-expandable portion 104 that extends in a curved line toward an obliquely rearward upper side, and a second linear non-expandable portion 105 that extends straight backward from the front end of the first linear non-expandable portion along the front-rear direction. Have The annular non-expanding portion 26 b of the folding promoting portion 26 is provided at the tip of the second linear non-expanding portion 105 so as to be spaced upward from the lower end portion of the outer peripheral non-expanding portion 40. The annular non-expanding portion 26 b has a circular shape that surrounds the tip of the second linear non-expanding portion 105.

  The outer periphery sewn line 41 includes a straight line portion 110 that extends from the intersection 109 with the first linear non-inflatable portion 104 to the rear, with respect to the intersection 109 of the outer periphery sewn line 41, and the rear of the straight portion 110. And an inclined line portion 111 that is inclined downward and bent.

  The seventh air chamber 35g is divided into an upper portion and a lower portion by the sewing line 103 in a partial range in the front-rear direction where the sewing line 103 is formed. The portion above the sewing line 103 of 35 g is expanded mainly by the gas flowing from the fifth air chamber 35e through the throttle channel 102, and the portion below the sewing line 103 of the seventh air chamber 35g is The gas expands by the gas flowing in from behind the sewing line 103 from above the sewing line 103.

  By such a line configuration of the outer peripheral sewing line 41 and the sewing line 103, a front virtual line obtained by extending the outer peripheral sewing line 41 (straight portion 110) immediately before the intersection 109 and the second linear non-inflatable portion 105 forward. The distance A between the front imaginary line and the non-inflatable portion 42a1 forming the upper end of the seventh air chamber 35g, the outer peripheral sewing line 41 behind the inclined line portion 111 and the second linear shape The relationship between the distance B between the rear virtual line that extends the non-expanded portion 105 as it is and the distance D between the rear virtual line and the non-expanded portion 42a1 is that the distance C and the distance D are almost equal. It becomes equal length, and becomes large in order of distance A, distance B, and distance C (and distance D). In this case, since the inclined line portion 111 is provided behind the intersection 109 of the outer peripheral sewing line 41, the distance B can be made larger than the distance A, and a large area below the sewing line 103 can be secured. Can easily flow around the sewing line 103.

  The height of the end of the non-expandable portion 42a2 extending upward from the outer peripheral sewing line 41 to form the throttle passage 102 and the height of the end of the second linear non-expandable portion 105 are determined by the outer peripheral sewing just before the intersection 109. The height is set substantially equal to the line 41 (straight line portion 110). With this positional relationship, the second linear non-expanding portion 105 does not inhibit the flow of gas passing through the throttle channel 103. The second linear non-expandable part 105 may be located at a position slightly upward (in the direction approaching the roof rail), that is, a position where the distance C is somewhat reduced, but from the position of the upper end 112 of the throttle channel 102. When it is arranged sufficiently below, the gas flowing into the seventh air chamber 35g is allowed to pass over the upper side of the second linear non-expandable portion 105 without the constriction flow path 102 being extremely narrowed by the folds. It is preferable for efficiently circulating the second linear non-expandable portion 105.

  A plurality of attachment pieces 22 are attached to the upper end portion of the airbag body 21 at intervals so as to correspond to the positions of the attachment brackets 8 fixed to the roof side portion 5 of the vehicle body 1. Has been. As shown in FIGS. 3 and 4, each attachment piece 22 is formed of a rectangular base cloth provided with two circular attachment holes 22 a.

  Such a rectangular attachment piece 22 is folded in two so that the positions of the two attachment holes 22a overlap, and the airbag body 21 is sandwiched between the two folded attachment pieces 22, and the attachment piece 22 A part of the mounting piece 22 is made to protrude from the airbag main body 21, and the mounting piece 22 is overlapped with both ends of the mounting piece 22 overlapped with the vehicle interior side surface and the vehicle outer surface of the airbag main body 21. Both ends and the two base fabric panels 24 of the airbag body 21 are sewn together with a sewing thread. As a result, the attachment piece 22 is attached to the upper end portion of the airbag body 21. In this case, the attachment hole 22 a provided in the attachment piece 22 is disposed at a position away from the airbag body 21.

  Further, in the curtain airbag 20 of the present embodiment, a linear sewing line (sewing line) 22b formed by a sewing thread in which the attachment piece 22 is sewn to the upper end portion of the airbag body 21 is a conventional air bag. Rather than being arranged in a straight line parallel to the upper end edge of the bag body, it is arranged in a curved or bent shape convexly toward the lower side where the inflating portion 30 is provided. In particular, in the present embodiment, the attachment sewing line 22b for sewing the attachment piece 22 is arranged on the outer side (upper side) of the outer peripheral sewing line 41 of the airbag body 21, and the attachment hole 22a is the center. It is formed to be curved in a circular arc shape.

  The attachment piece 22 of such a curtain airbag is attached to the attachment bracket 8 so that the surface of one side of the attachment piece 22 is aligned with the position of the attachment hole 22a of the attachment piece 22 and the position of the through hole of the attachment bracket 8. At the same time, the fixing member 9 such as a screw or a bolt is inserted into the mounting hole 22 a from the other side of the mounting piece 22 and fixed to the mounting bracket 8 to be mounted on the vehicle body 1.

  In this case, each attachment piece 22 of the present embodiment is sewn to the airbag body 21 by an arcuate sewing line 22b centering on the attachment hole 22a. For this reason, even when a large stress is applied to each attachment piece 22 of the curtain airbag 20 due to the inflation and deployment of the airbag body 21 when gas is supplied to the airbag body 21 and the airbag body 21 is inflated and deployed, The stress at the time of inflating and deploying can be effectively distributed over the entire arcuate sewing line rather than being concentrated only at the boundary between the attachment piece and the airbag body in the sewing line as in the prior art.

  As a result, the sewing thread for sewing the attachment piece 22 to the airbag body 21 when the airbag body 21 is inflated and deployed, for example, without excessive reinforcement as in the prior art around the attachment piece 22 of the curtain airbag 20. It is possible to effectively prevent unraveling and cutting, damage to the base fabric panel 24 of the airbag body 21, and the like. Therefore, it is possible to form the durable curtain airbag 20 with a simple structure, and it is possible to prevent an increase in manufacturing cost and weight of the airbag device due to reinforcement of the attachment piece 22.

  The attachment sewing line 22b for sewing the attachment piece 22 in the present embodiment is formed in an arc shape centering on the attachment hole 22a as described above. In the present invention, this attachment sewing line 22b is formed. For example, as shown in FIG. 5, the entire sewing line 22 b is curved in a convex shape toward the inflatable portion 30 as shown in FIG. 5 so that the stress at the time of inflation and deployment of the airbag body 21 can be dispersed. It may be formed so as to exhibit a bent form.

  When the curtain airbag device 10 according to the present embodiment as described above is mounted on the vehicle body 1, first, the airbag body 21 of the curtain airbag 20 that is spread in a plane as shown in FIG. The sleeve is folded in a roll shape or a bellows shape from the part side to the upper part, and a sleeve (not shown) is placed so as to hold the folded form. In the present invention, the method and procedure for folding the curtain airbag 20 are not particularly limited.

  Next, the curtain airbag 20 is fixed by fixing the mounting piece 22 of the curtain airbag 20 protruding outward from the sleeve to the mounting bracket 8 fixed to the vehicle body 1 via a fixing member 9 such as a screw. Are attached and stored along the front pillar 2, the roof side portion 5, and the rear pillar 4 of the vehicle body 1.

  At this time, the inflator 11 of the curtain airbag device 10 is attached to a predetermined position of the vehicle body 1, and the gas outlet of the inflator 11 extends from the inlet of the gas inlet 21 a of the curtain airbag 20 into the airbag body 21. Has been inserted.

  As described above, the curtain airbag device 10 of the present embodiment mounted on the vehicle body 1 generates high-pressure gas for inflation from the inflator 11 when occurrence of an accident such as a side collision or rollover is detected or predicted. The gas is caused to flow into the airbag main body 21 from the gas introduction portion 21a of the curtain airbag 20.

  As a result, the curtain airbag 20 starts to inflate and deploy, and the sleeve enclosing the airbag body 21 is broken, and the front pillar garnish and the roof head lining attached to the vehicle body 1 are deformed, thereby the curtain airbag. 20 projects into the passenger compartment. Further, the curtain airbag 20 is deployed in a curtain shape downward along the side windows 6F and 6R for the front seat and the rear seat and the center pillar 3.

  At this time, the airbag main body 21 has the presence of the linear non-inflatable portion 42a and the annular non-inflatable portion 42b formed in the airbag main body 21 to partition the first air chamber 35a to the seventh air chamber 35g, and the peripheral sewing. Due to the line change of the arrival line 41, the expansion thickness (dimension in the vehicle width direction) of the airbag main body 21 is regulated, and the entire airbag main body 21 is curved downwardly toward the center in the front-rear direction. It expands into a bow-like shape (arch shape) that shrinks.

  Further, the front row inflatable portion 31 of the airbag main body 21 is inflated and deployed, so that the front row inflatable portion 31 of the airbag main body 21 is connected to the belt line 7 as shown in FIG. The front row expansion portion 31 can be stably overlapped with the front door side door trim in a side view.

  Furthermore, in the present embodiment, the folding promoting portion 26 including the linear non-inflatable portion 103 is provided in the seventh air chamber 35g of the airbag body 21 as described above. In this case, when the airbag main body 21 is inflated and deployed, the gas supplied from the gas introduction part 21a through the communication part (main flow path part) 33 passes through the sixth air chamber 35f and the seventh air chamber 35g. Then, it passes through the upper side of the folding promotion part 26 and flows into the rear side of the folding promotion part 26.

  More specifically, inside the seventh air chamber 35g, the gas flowing from the communication portion (main flow passage portion) 33 to the seventh air chamber 35g via the fifth air chamber 35e is linear non-expandable portion 103. From the upper side of the air bag 21 to the rear of the linear non-inflatable portion 103, and further flows toward the rear lower end portion of the airbag main body 21, and part of the gas also flows to the lower side of the linear non-inflatable portion 103. Particularly in this case, the gas flows into the seventh air chamber 35g through the narrow throttle channel 102, so that the flow rate of the gas into the seventh air chamber 35g is increased. It can be smoothly distributed to the side and the lower side. Further, inside the sixth air chamber 35f, the gas flowing from the communication portion (main flow passage portion) 33 to the sixth air chamber 35f is seen from above the seventh air chamber 35g where the folding promoting portion 26 is provided. The air flows around the seventh air chamber 35g and further flows toward the rear lower end of the airbag body 21.

  Thus, by the gas flowing into the sixth air chamber 35f and the seventh air chamber 35g, the sixth air chamber 35f and the seventh air chamber 35g are expanded, and the expansion pressure is applied to the sixth air chamber 35f and the seventh air chamber 35g. Occurs. As a result, a force is applied to the airbag body 21 such that the latter half of the airbag body 21 bends further downward with the folding promoting portion 26 as a starting point.

  Moreover, in the present embodiment, when the region in the front-rear direction in which the linear non-inflatable portion 103 of the airbag body 21 is provided (the front-rear peripheral region of the VI-VI line in FIG. 2), the seventh air The chamber 35g is divided in the vertical direction by the linear non-expanding portion 103 as described above. In other words, the region where the linear non-expanding portion 103 is provided divides the linear non-expanding portion 103, the seventh air chamber 35g, and the sixth air chamber 35f with respect to the vertical direction and the seventh air chamber 35g. The non-inflatable portion 42a1 that forms the upper end is divided into three parts, a lower part of the seventh air chamber 35g, an upper part of the seventh air chamber 35g, and a sixth air chamber 35f.

  Thereby, when the airbag main body 21 is inflated and deployed, the lower portion 115 of the seventh air chamber 35g divided by the linear non-inflatable portion 103, the upper portion 114 of the seventh air chamber 35g, and the upper portion thereof For example, as shown in FIG. 6, the straight front part 116 of the sixth air chamber 35 f located inflates in the left-right direction, that is, in the direction in which the thickness of the airbag body 21 is increased, and the vertical dimension of each part. Becomes shorter. As a result, the position of the lower end edge of the region where the folding promoting portion 26 is provided is pulled to the upper side where the attachment piece 22 is provided, so that it is more than the position of the lower end edge of the other region of the airbag body 21. It is lifted relatively upward.

  As shown in FIG. 6, the region where the linear non-expandable portion 103 is provided is arranged in such a manner that three air chambers are arranged vertically. Two air chambers are arranged vertically in front and rear of the linear non-expandable portion 103, and have a dimensional relationship of distance A to distance D as described above. For this reason, the linear non-expanding portion 103 is formed by the front side portion of the seventh air chamber 35g which is the sum of the dimensions A and C and the rear side portion of the seventh air chamber 35g which is the sum of the dimensions B and D. The vertical dimension is less clogged than the middle part of the provided seventh air chamber 35g. Therefore, as shown in FIG. 7, the portion where the linear non-expandable portion 103 is bent is greatly bent, and a thick air chamber is formed in the front and rear of the portion so that it is difficult to bend. 103 serves as an introduction portion for bending, and preferable folding is promoted.

  In this embodiment, the region where the linear non-inflatable portion 103 is provided is divided into three in the vertical direction by the sewing line. For example, the region is divided into four or more in the vertical direction by the sewing line. Accordingly, it is possible to increase the size of lifting the position of the lower edge of the region upward.

  As described above, in the present embodiment, when the airbag main body 21 is inflated and deployed, a force that causes the airbag main body 21 to bend largely from the folding promotion portion 26 acts and the region where the folding promotion portion 26 is provided. The lower edge of the is partially lifted relatively upward. As a result, as shown in FIG. 7, the airbag main body 21 is deployed in a form in which the latter half portion of the airbag main body 21 is partially bent so as to involve the folding promoting portion 26. As a result, the position of the rear lower end portion of the airbag body 21 can be positively moved so as to rotate downward while pulling forward.

  Therefore, as shown in FIG. 1, the airbag main body 21 of the present embodiment has the curtain airbag 20 formed in a small size so that the lower end edge of the rear row inflatable portion 32 is positioned above the belt line 7. However, when the airbag main body 21 is inflated and deployed, the rear row inflatable portion 32 of the airbag main body 21 can be extended below the belt line 7. Accordingly, the rear row inflatable portion 32 can be stably overlapped with the rear row side door in a side view, and further, a large area where the rear row inflatable portion 32 and the rear row side door overlap is ensured. be able to.

  That is, in the curtain airbag 20 of the present embodiment, when the airbag body 21 is inflated and deployed, the intermediate inflation portion 34 of the airbag body 21 is deployed so as to overlap along the center pillar 3, and the airbag body 21. The front row expansion portion 31 and the rear row expansion portion 32 extend below the belt line 7 corresponding to the position of the lower edge of the front and rear side window portions 6F, 6R, and the front row side door trim and the rear row side door trim. And can overlap each other.

  In this case, when the heads of the occupants in the front row come into contact with the curtain airbag 20 at, for example, a position (spot position) 50a as indicated by a virtual line in FIG. It is supported by the vehicle body 1 at the position, and is also supported by the center pillar 3 where the intermediate expansion portion 34 overlaps and the front row side door where the front row expansion portion 31 overlaps. In FIG. 7, a portion where the curtain airbag 20 is supported by the vehicle body 1 is indicated by a broken-line circle.

  Thereby, since the curtain airbag 20 is supported from the vehicle body 1 so as to surround the heads (hit point positions 50a) of the front row occupants, the reaction force can be effectively obtained. The front row inflatable portion 31 of the curtain airbag 20 can be safely protected and the front row occupants can be reliably prevented from being released from the vehicle.

  Further, for the occupants in the rear row, when the occupant's head comes into contact with the curtain airbag 20 at, for example, the position (spot position) 50b as shown by the phantom line in FIG. While being supported by the vehicle body 1 at the position of the piece 22, it is also supported by the center pillar 3 where the intermediate expansion portion 34 overlaps and the rear row side door where the rear row expansion portion 32 overlaps.

  Accordingly, since the curtain airbag 20 is supported from the vehicle body 1 at a position surrounding the heads (hit point positions 50b) of the occupants in the rear row, the reaction force can be effectively obtained. In addition, the curtain airbag 20 can be safely protected by the rear row inflating portion 32, and the rear row passengers can be reliably prevented from being released from the vehicle.

  Particularly in this case, the distance between the hitting point position 50b and the portion where the attachment piece 22 of the curtain airbag 20 is supported by the vehicle body 1, and the hitting point position 50b and the inflating portion 30 of the curtain airbag 20 are for the center pillar 3 and the rear row. The distance between the portion supported by the side door is shorter than, for example, the distance from the hit point position 50b to the rear pillar 4, so that the heads of the passengers in the rear row can be firmly supported by the curtain airbag 20 and more stable. Can protect the passengers.

  As described above, the curtain airbag 20 of the present embodiment can improve the out-of-vehicle emission reduction performance and ensure the safety of passengers seated in the front row and the rear row as described above. In addition, as shown in FIG. 1, the curtain airbag 20 is formed with a small size so that the lower end edge of the rear-row inflatable portion 32 is positioned above the belt line 7. Accordingly, the size of the base fabric panel 24 forming the airbag body 21 can be reduced, and the output of the inflator 11 can be reduced. Therefore, the curtain airbag device 10 can be reduced in size and weight, and the manufacturing cost can be reduced. Can be realized effectively.

  In the curtain airbag 20 of the above-described embodiment, the folding promoting portion 26 is provided only in the seventh air chamber 35g of the rear row inflating portion 32. However, in the present invention, the folding promotion portion can be provided not only in the rear row expansion portion but also in the front row expansion portion, and the folding promotion portion may be provided only in the front row expansion portion.

  Further, in the curtain airbag 20 of the above-described embodiment, the folding promoting portion 26 of the seventh air chamber 35g is configured by the linear non-inflatable portion 26a and the annular non-inflatable portion 26b made of sewing lines. The form (structure) of the folding promoting portion in the present invention is not limited to this.

  Here, the modification of a folding promotion part is shown in FIG. In addition, in FIG. 8 and FIG. 9 mentioned later, suppose that the detailed description is abbreviate | omitted by using the same code | symbol about the part which has the substantially same structure as the curtain airbag 20 of embodiment mentioned above. .

  In the modification shown in FIG. 8, the folding promoting portion 26 ′ disposed in the seventh air chamber 35 g of the airbag main body 21 ′ does not include the linear non-inflatable portion in the above-described embodiment, and the annular non-inflatable portion. 26b, and an inclined line portion 111 is formed on the outer peripheral sewn line 41 below. In addition, contrary to FIG. 8, the folding promoting portion 26 ′ according to the modification may be configured by only the linear non-expanding portion without including the annular non-expanding portion in the above-described embodiment.

  When the folding promoting portion 26 ′ does not include a linear non-expanding portion as shown in FIG. 8, a gas flow path (first gas flow path 106) that guides gas from the upper side of the annular non-expanded portion to the rear is provided. It is formed larger in the vertical direction than the gas flow path (second gas flow path 107) for guiding the gas from the lower side to the rear side of the annular non-expanded portion.

  In the seventh air chamber 35g, the gas flowing in from the fifth air chamber 35e through the throttle channel 102 passes through the upper side of the circular joint 108 as the folding promoting portion 26 'by the first gas channel 106, and is circular. The first gas flow path 106 circulates to the rear of the joint 108 and passes through the lower side of the circular joint 108 by the second gas flow path 107 to the rear of the circular joint 108 as described above. By being formed larger in the vertical direction than the gas flow path 107, the gas flow rate of the first gas flow path 106 is larger than that of the second gas flow path 107.

  Accordingly, when the airbag main body 21 ′ is inflated and deployed, the seventh air chamber is formed from the communication portion (main flow passage portion) 33 through the fifth air chamber 35e in the seventh air chamber 35g of the rear-row inflating portion 32 ′. The gas that has flowed to 35 g mainly circulates from the upper side of the circular joint portion 108 to the rear side of the circular joint portion 108, so that in this modified example as well, the sixth air chamber is the same as in the above-described embodiment. Since a difference in inflation pressure occurs between 35f and the seventh air chamber 35g, a force acts such that the latter half of the airbag body 21 bends downward from the circular joint 108 as a starting point. Therefore, even with the curtain airbag 20 ′ according to such a modification, the same effect as that of the curtain airbag 20 of the above-described embodiment can be obtained.

  Further, as shown in FIG. 9, the folding promoting portion of the present invention is formed from the lower end portion of the outer peripheral non-inflatable portion 40 ″ of the airbag main body 21 ″ from the airbag main body 21 ″. It may be constituted by a narrow non-expanding portion 26c protruding upward or obliquely rearward and upward so as to cut into the seventh air chamber 35g (back row expansion portion 32 ″).

  The non-expandable portion 26c shown in FIG. 9 is formed such that an outer peripheral sewing line 41 ″ for sewing the outer peripheral edge portions of the left and right base fabric panels 24 partially protrudes toward the seventh air chamber 35g. Here again, the inclined line portion 111 is provided behind the non-inflatable portion 26c in the outer peripheral sewing line 41 ″. 2 is formed on the airbag body 21 as well as a sewing line that forms a narrow non-inflatable portion 26c separately from the peripheral sewing line 41. By doing so, the folding promoting portion 26 ″ can be provided.

  In the curtain airbag 20 ″ in which the folding promoting portion 26 ″ including the narrow non-inflatable portion 26c is provided in the seventh air chamber 35g, when the airbag main body 21 ″ is inflated and deployed, the gas is In the sixth air chamber 35f and the seventh air chamber 35g, the air flows around the non-inflatable portion 26c through the upper side of the non-inflatable portion 26c and flows toward the rear lower end of the airbag body 21 ″. A force that bends the second half portion of the airbag body 21 ″ largely downward from the non-inflatable portion 26c can be applied.

  Accordingly, the rear row inflatable portion 32 ″ of the airbag body 21 ″ can be extended below the belt line 7 and can be stably overlapped with the rear row side door. Therefore, since the inflated and deployed curtain airbag 20 ″ can be supported from the vehicle body 1 at a position surrounding the heads of the occupants in the rear row and can effectively obtain a reaction force, the curtain airbag 20 ″ can be used for the rear row. The inflatable portion 32 ″ can safely protect the heads of the occupants in the rear row and reliably prevent the occupants from being released from the vehicle.

1 Car body 2 Front pillar (A pillar)
3 Center pillar (B pillar)
4 Rear pillar (C pillar)
5 Roof side part 6 Side window part (side window glass)
6F Front row side window 6R Rear row side window
7 Belt Line 8 Mounting Bracket 9 Fixing Member 10 Curtain Airbag Device 11 Inflator 20, 20 'Curtain Airbag 20 "Curtain Airbag 21, 21' Airbag Main Body 21" Airbag Main Body 21a Gas Introducing Portion 22 Mounting Piece 22a Mounting Hole 22b Sewing line (sewing line)
23 Dither belt 24 Base fabric panel 24a Vehicle side base fabric panel 24b Outer vehicle side base fabric panel 26, 26 'Folding promotion part 26 "Folding promotion part 26a Linear non-expanding part 26b Annular non-expanding part 26c Non-inflating part 30 Inflating part 31 Front row expansion section 32, 32 'Rear row expansion section 32 "Rear row expansion section 33 Communication section (main flow path section)
34 intermediate expansion portion 35a first air chamber 35b second air chamber 35c third air chamber 35d fourth air chamber 35e fifth air chamber 35f sixth air chamber 35g seventh air chamber 40, 40 ″ outer peripheral non-expandable portion 41, 41 ″ Peripheral sewing line 42 Non-expandable portion 42a Linear non-expandable portion 42a1 Non-expandable portion 42a2 Non-expandable portion 42b Annular non-expandable portion 50a, 50b Strike position 100 Passages 101, 102 communicating the fourth and fifth air chambers Throttle channel 103 Sewing line 104, 105 Non-expandable part 106 First gas channel 107 Second gas channel 108 Circular joint 109 Intersection 110 Linear part 111 Inclined line part 112 Upper end 114 of throttle channel Upper portion 115 Lower portion 116 of the seventh air chamber 116 Front portion of the sixth air chamber A, B, C, D Distance

Claims (8)

An inflator that generates gas and a curtain airbag that is attached along an upper edge of a side window portion of the vehicle body in a state of being folded in a predetermined procedure, and the curtain airbag receives the gas from the inflator. A curtain airbag device having an airbag body that is supplied and inflated, and wherein the airbag body inflates and deploys downward in a curtain shape so as to cover a vehicle interior side of the side window portion by generation of the gas. ,
The airbag main body includes a gas introduction portion that introduces the gas into the airbag main body, a main flow passage portion that communicates with the gas introduction portion and distributes the gas, and a plurality of air bubbles that communicate with the main flow passage portion. A chamber,
The airbag main body is formed by at least one air chamber, and is formed by a front row inflatable portion that can be inflated and deployed corresponding to the position of the front row side window portion of the vehicle body, and at least one air chamber, A rear row inflatable portion that can be inflated and deployed corresponding to the position of the rear row side window portion of the vehicle body,
The at least one air chamber arranged at the lower end of the airbag main body includes a non-inflatable portion of the airbag main body, and a folding promoting portion that facilitates folding of the airbag main body when the airbag main body is inflated and deployed. Provided,
The folding promoting portion is provided corresponding to the position between the front end portion and the rear end portion of the rear row side window portion in the front-rear direction of the vehicle body,
The air chamber provided with the folding promoting part has a flow path through which the gas flows in one direction around the folding promoting part.
A curtain airbag device characterized by that.   The lower end edge of the rear row inflatable portion is located at the same position as the lower end position of the rear row side window when the curtain airbag is expanded without supplying the gas with the curtain airbag attached to the vehicle body. The airbag body is disposed above the position, and is displaced downward from the lower end position of the rear row side window portion when the airbag body is bent with the folding promoting portion as a starting point when inflated and deployed. The curtain airbag device according to 1.   The curtain airbag device according to claim 1, wherein the folding promoting portion is provided by partially dividing the air chamber including the folding promoting portion into upper and lower portions.   The folding promoting portion is formed from a lower edge portion of the outer peripheral non-inflatable portion provided on the outer peripheral portion of the airbag main body by a sewing line for sewing the base fabric panels forming the airbag main body in a curved shape and / or a linear shape. The curtain airbag device according to any one of claims 1 to 3, further comprising a linear non-inflatable portion formed to extend upward or obliquely rearward and upward.   The curtain airbag device according to any one of claims 1 to 4, wherein the air chamber provided at the lower end portion and provided with the folding promoting portion communicates with another adjacent air chamber via a throttle portion.   The curtain airbag device according to claim 5, wherein the folding promoting portion is arranged behind the throttle portion of the air chamber in the front-rear direction of the vehicle.   The curtain airbag device according to claim 5 or 6, wherein the folding promoting portion is disposed below the throttle portion of the air chamber in a vertical direction of the vehicle.   The curtain airbag device according to claim 7, wherein a lower end of the air chamber including the folding promoting portion is disposed at a height at which the throttle portion side is higher than the downstream side with respect to the folding promoting portion.

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