JP6634036B2 - Side airbag device - Google Patents

Description

  The present invention relates to a side airbag device that inflates and deploys between an occupant and a side wall or the like in a vehicle cabin to restrain the occupant when an impact occurs on the vehicle.

  Airbags are almost standard equipment in recent vehicles. An airbag is a safety device that operates in an emergency such as a vehicle collision, and inflates and deploys with gas pressure to receive and protect an occupant. There are various types of airbags depending on the installation location and application. For example, a front airbag is provided at the center of the steering to protect the driver from a collision from the front and rear. Also, to protect the occupants from side collisions and the subsequent rollover (rollover), curtain airbags that inflate and deploy along the side windows from near the ceiling of the wall, and beside the occupants from the side of the seat A side airbag that inflates and deploys is provided.

  Patent Literature 1 describes a side airbag device including an inflator serving as a gas supply source and a bag-shaped airbag body (cushion portion). The cushion portion receives gas from the inflator and inflates and deploys to restrain the occupant of the vehicle seat from the side. The interior of the cushion is divided into a plurality of rooms (also called expansion chambers or chambers) by a horizontal partition and a vertical partition.

  The vertical partition section is a partition wall that partitions the inside of the cushion section back and forth, and is partitioned into a rear expansion chamber in which an inflator is installed and a front expansion chamber located on the vehicle front side of the rear expansion chamber. The horizontal partition is a partition wall that partitions the interior of the cushion portion up and down, and is partitioned into a front expansion chamber and a rear expansion chamber, and a lower expansion chamber located below these vehicles.

  A communication hole and an adjustment valve are provided in the vertical section. The adjustment valve in the vertical section is a valve that controls the flow of the inflation gas through the communication hole that connects the rear expansion chamber and the front expansion chamber, and adjusts the internal pressure of the rear expansion chamber and the front expansion chamber. The lateral partition is provided with an opening and a check valve. The check valve in the lateral partition is a valve that controls the flow of the inflation gas at the opening that connects the lower expansion chamber and the rear expansion chamber, and has both a valve body portion on the vehicle exterior side and a valve body portion on the vehicle interior side. The non-return valve allows the inflation gas to flow from the rear expansion chamber to the lower expansion chamber by opening both valve body parts, and on the other hand, when the both valve body parts are closed, the outflow which is the reverse flow is performed. (Reflux) is regulated. In Patent Literature 1, the flow of the inflation gas in the plurality of chambers of the cushion portion is controlled by an adjustment valve and a check valve provided on the partition wall.

JP 2015-20614 A

  However, in Patent Document 1, when the cushion portion is fully inflated and deployed and the occupant is restrained in the front expansion chamber, the front expansion chamber is crushed and the internal pressure rises, and gas passes through the regulating valve in the vertical section to the rear expansion chamber. Because of the backflow, the pre-expansion chamber cannot be maintained at a predetermined pressure. In the check valve of the lateral compartment, the cushion portion expands and deploys, and when the occupant is restrained in the lower inflation chamber, the lower inflation chamber is crushed and the internal pressure rises. By being pressed and coming into contact with each other, the backflow of gas from the lower expansion chamber to the rear expansion chamber is regulated.

  In other words, with this check valve, even if the cushion portion is fully inflated and deployed, the backflow of gas cannot be reliably regulated unless the expansion chamber is crushed and the two valve body portions are pressed and come into contact with each other. The two valve bodies of the check valve must be formed so as to reliably contact each other when the expansion chamber is crushed and pressed, and the configuration becomes complicated.

  In view of the above problems, the present invention can easily form a vent hole functioning as a check valve in a partition wall of a cushion portion, and set a chamber receiving gas supply via the vent hole at a predetermined pressure during inflation and deployment. An object is to provide a side airbag device that can be maintained.

  In order to solve the above problems, a typical configuration of a side airbag device according to the present invention is a side airbag device that expands and deploys to the side of an occupant of a vehicle seat to restrain the occupant, and has a bag-like shape. A cushion portion; an inflator for supplying gas to the cushion portion to inflate and deploy the gas; the cushion portion is located on a vehicle front side of the first chamber directly receiving the supply of gas from the inflator; A second chamber that receives supply of gas from the inflator via the first chamber; and a partition wall that partitions the first chamber and the second chamber, wherein the partition wall is provided inside the cushion portion. A first member and a second member extending toward the inside of the cushion portion from the first member, a sewing line for intermittently sewing the first member and the second member, and a shape formed by cutting off the sewing line. One or more internal vent holes, wherein the compartment wall is configured such that the internal vent holes close after the inflation and deployment of the cushion portion is initiated and the second chamber reaches a predetermined internal pressure. It is characterized by having.

  According to the above configuration, the cushion portion is partitioned into at least the first chamber and the second chamber by the partition wall. In the cushion portion, when gas is supplied from the inflator during inflation and deployment, first, the first chamber is inflated, gas is introduced into the second chamber through an internal vent hole, and then the second chamber is inflated. I do. In the above configuration, the partition wall is configured such that the internal vent hole closes after the inflation and deployment of the cushion portion is started and the second chamber reaches a predetermined internal pressure. Therefore, when the pressure of the second chamber reaches a predetermined pressure during the expansion and deployment of the cushion portion, the internal vent hole functions as a check valve. Therefore, when the second chamber has a predetermined pressure when the cushion portion is inflated and deployed, the gas does not flow back from the second chamber to the first chamber, and the second chamber can be maintained at the predetermined pressure. Further, in the above configuration, the internal vent hole functioning as a check valve can be easily formed by a sewing method in which a sewing line for joining the first member and the second member constituting the partition wall is intermittent.

  The dimension of the partition wall in the sewing line direction may be set so that the internal vent hole is closed after the second chamber reaches a predetermined internal pressure. As an example, when the cushion portion is fully expanded and deployed, and the partition wall is stretched from the slack state to the stretched state, if the dimension of the stretched partition wall in the sewing line direction is set sufficiently short. It is possible to close the internal vent hole.

  The first member and the second member may extend from both inside surfaces of the cushion portion toward the front and the inside of the cushion portion, respectively, and the sewing line may extend in a vertical direction. Thus, the cushion portion has a shape partitioned into the front and rear of the vehicle by the partition wall including the sewing line extending in the vertical direction.

  The first member and the second member are overlapped like a page to be bound and are joined by a sewing line. The inner vent hole is formed by bending the sewing line in the middle of the first member and the second member. It may be formed by cutting off at the edge of the member. For this reason, the inner vent hole has a width from a point where the sewing line is bent halfway to an edge of the first member and the second member. This width acts as a margin for closing the internal vent hole, and the internal vent hole is securely closed when the cushion portion is inflated and deployed, and can sufficiently function as a check valve.

  It is preferable that the sewing line forming the internal vent hole includes a straight line from a bent portion on the way to a stop at the edges of the first member and the second member. Thereby, the internal vent hole can be easily partitioned.

  The sewing line may include two parallel straight lines. Thereby, the gas can stably pass through the internal vent hole.

  At least one of the first member and the second member is an independent cloth material, and is preferably sewn and joined to the base cloth of the cushion portion. Thereby, since the partition wall can be formed using a cloth material different from the base cloth of the cushion portion, an appropriate length and shape required for the partition wall can be easily set.

  At least one of the first member and the second member may be a part of the base fabric of the cushion portion. Thus, the partition wall can be easily formed by extending the base cloth of the cushion portion.

  The first chamber may be a rear chamber on the rear side of the vehicle, and the second chamber may be a front chamber on the front side of the vehicle. This allows the internal vent hole to introduce gas from the rear chamber to the front chamber when the cushion portion is inflated and deployed. When the pressure in the front chamber reaches a predetermined pressure when the cushion portion is inflated and deployed, gas does not flow backward from the front chamber to the rear chamber, and the front chamber can be maintained at the predetermined pressure.

  Another representative configuration of the side airbag device according to the present invention is a side airbag device that inflates and deploys to the side of an occupant of a vehicle seat to restrain the occupant, and includes a bag-shaped cushion portion and a cushion portion. And an inflator for inflating and deploying gas to the air, and one or more partition walls for partitioning the interior of the cushion into a plurality of chambers. Each of the partition walls extends from the inside of the cushion to the interior of the cushion. First and second members extending toward each other, a sewing line for intermittently sewing the first and second members, and one or more internal vent holes formed by interruption of the sewing line. And an internal vent hole is provided in each of the partition walls such that gas is supplied to all other chambers sequentially from one or more predetermined chambers that directly receive the supply of gas from the inflator. And each of the partition walls is configured such that the internal vent hole closes after a delayed inflating chamber of two adjacent chambers it defines reaches a predetermined internal pressure. It is characterized by having been done.

  According to the above configuration, even when the cushion portion is partitioned into two or more chambers by one or more partition walls, the internal vent holes are provided so that gas is supplied to all of the plurality of chambers. . Therefore, all the chambers of the cushion can be expanded and deployed. In the above configuration, each of the partition walls is configured such that the internal vent hole closes after the delaying expansion chamber of the two adjacent chambers defining the partition reaches the predetermined internal pressure. For this reason, when the inflation and deployment of the cushion portion is completed, the internal vent hole closes and functions as a check valve, and the plurality of chambers supplied with gas can be maintained at a predetermined pressure. Further, in the above configuration, the internal vent hole functioning as a check valve can be easily formed by a sewing method in which a sewing line for joining the first member and the second member constituting the partition wall is intermittent.

  The size of each of the partition walls in the direction of the sewing line is set so that the internal vent hole is closed after the chamber that expands late reaches a predetermined internal pressure. As an example, when the cushion portion is fully expanded and deployed, and the partition wall is stretched from the slack state to the stretched state, if the dimension of the stretched partition wall in the sewing line direction is set sufficiently short. It is possible to close the internal vent hole.

  The first member and the second member are overlapped like a page to be bound and are joined by a sewing line. The inner vent hole is formed by bending the sewing line in the middle of the first member and the second member. It may be formed by cutting off at the edge of the member. For this reason, the inner vent hole has a width from a point where the sewing line is bent halfway to an edge of the first member and the second member. This width acts as a margin for closing the internal vent hole, and the internal vent hole is securely closed when the cushion portion is inflated and deployed, and can sufficiently function as a check valve.

  It is preferable that the sewing line forming the internal vent hole includes a straight line from a bent portion on the way to a stop at the edges of the first member and the second member. Thereby, the internal vent hole can be easily partitioned.

  The sewing line may include two parallel straight lines. Thereby, the gas can stably pass through the internal vent hole.

  It is preferable that two predetermined chambers directly receive the supply of gas from the inflator. Accordingly, even when the cushion portion is divided into three or more chambers, the gas directly supplied to the two predetermined chambers can be passed through the internal vent holes by setting the internal vent holes. Can be supplied to other chambers sequentially and indirectly. Since the internal vent hole functions as a check valve when the cushion portion is inflated and deployed, three or more chambers to which gas has been supplied can be maintained at a predetermined pressure.

  The above-described side airbag device may further include a diffuser mounted on the inflator to simultaneously supply gas from the inflator to two predetermined chambers. By using the diffuser as described above, the gas from the inflator is guided in two directions (for example, up and down directions), so that the gas can be more reliably supplied to two predetermined chambers.

  It is preferable that one predetermined chamber directly receives the supply of gas from the inflator, and a plurality of other chambers exist. Even in such a case, by setting the internal vent hole, the gas directly supplied to the predetermined chamber can be sequentially and indirectly supplied to other chambers through the internal vent hole. When the cushion portion is inflated and deployed, the internal vent hole functions as a check valve, so that a plurality of other chambers to which gas has been supplied can be maintained at a predetermined pressure.

  ADVANTAGE OF THE INVENTION According to this invention, the vent hole which functions as a non-return valve can be easily formed in the partition wall of a cushion part, and the side which can maintain the gas supply via the vent hole at the predetermined pressure at the time of expansion and deployment can be maintained. An airbag device can be provided.

It is a figure which illustrates the side airbag device concerning the embodiment of the present invention. It is a figure which illustrates the cushion part of FIG.1 (b) independently. It is a figure which illustrates the internal structure of the cushion part of FIG. 2 (a). FIG. 3 is a development view of a base cloth constituting the cushion section of FIG. It is a figure which illustrates the internal structure at the time of completion of the expansion deployment of the cushion part of FIG. It is a figure which illustrates the modification of the cushion part and partition wall of FIG.4 (b). It is a figure which illustrates the airbag concerning other embodiment of this invention.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, and the like shown in the embodiments are merely examples for facilitating the understanding of the present invention, and do not limit the present invention unless otherwise specified. In the specification and the drawings, elements having substantially the same function and configuration will be denoted by the same reference numerals, and redundant description will be omitted. Elements not directly related to the present invention will be omitted. I do.

  FIG. 1 is a diagram illustrating a side airbag device (hereinafter, airbag 100) according to an embodiment of the present invention. As illustrated in FIG. 1A, in the present embodiment, the airbag 100 according to the present invention is realized as a so-called side airbag that inflates and deploys on the side of a vehicle right seat (hereinafter, a seat 102). . The installation location of the airbag 100, which is a side airbag, is not limited to the seat 102, but may be another location such as a side door trim if it can be inflated and deployed to the side of the occupant.

  The cushion portion 104 is a bag-shaped portion of the airbag 100 that receives an occupant in an emergency such as when an impact occurs on the vehicle, and inflates and deploys between the occupant and the side door in a flat shape. The cushion portion 104 is formed by stacking and sewing or bonding a plurality of base fabrics constituting the surface. The cushion portion 104 is wound or folded and housed in a housing (not shown) provided on a side portion of the seat back 106. Since the cushion portion 104 in the stored state is covered with a seat cover or the like, the cushion portion 104 is invisible from the outside. At the time of operation, the seat cover and the like are torn and expanded and deployed to the side of the occupant.

  In the present embodiment, the interior of the cushion portion 104 is partitioned into two chambers. As can be seen from FIG. 1A, the cushion section 104 is provided with a rear chamber 108 on the rear side of the vehicle as a first chamber and a front chamber 110 on the front side of the vehicle as a second chamber.

  FIG. 1B is a view of the cushion portion 104 of FIG. 1A as viewed from the outside in the vehicle width direction. As illustrated in FIG. 1B, in the cushion portion 104, the rear chamber 108 particularly protects a portion that is more susceptible to a load, such as the shoulder E <b> 1 and the waist E <b> 2 of the occupant 112 exemplified by the dummy doll. The front chamber 110 is configured to protect the arm E3, the abdomen E4, and the like.

  FIG. 2 is a diagram illustrating the cushion section 104 of FIG. 1B alone. FIG. 2 illustrates the cushion portion 104 of FIG. 1B as viewed from the inside of the vehicle in the vehicle width direction (occupant 112 side). An inflator 114 as a gas generator is provided inside the rear chamber 108. The cushion portion 104 expands due to the pressure of the gas supplied from the inflator 114 and restrains the occupant. The inflator 114 employed in the present embodiment is of a cylinder type (tubular type). The inflator 114 has a stud bolt 116. The stud bolt 116 is exposed from the rear chamber 108 and fastened to a housing or the like on the side of the seat 102 (see FIG. 1A).

  The currently widespread inflator 114 is filled with a gas generating agent and burns it to generate a gas, or is filled with a compressed gas and supplies a gas without generating heat, or There is a hybrid type that uses both combustion gas and compressed gas. As the inflator 114, any type can be used. After the gas supplied from the inflator 114 is inflated and deployed, the gas is exhausted from an exhaust hole 118 provided on the front side (left side in the drawing) of the cushion portion 104 in the vehicle.

  FIG. 2B is a diagram illustrating a process of expanding and deploying the cushion portion 104 of FIG. 2A. As illustrated in the left diagram of FIG. 2B, the cushion portion 104 of the airbag 100 is configured to preferentially inflate and deploy because the rear chamber 108 directly receives gas supply from the inflator 114. ing. Subsequently, as illustrated in the right diagram of FIG. 2B, the front chamber 110 expands and expands by receiving supply of gas from the inflator 114 via the rear chamber 108. In the following, a portion that realizes such an expansion and deployment operation will be further described.

  FIG. 3 is a diagram illustrating an internal configuration of the cushion portion 104 of FIG. However, here, the state where the cushion portion 104 is in the middle of inflation and deployment and the front chamber 110 has not yet completed inflation and deployment is illustrated. FIG. 3A illustrates the internal structure of the cushion portion 104 shown in FIG. FIG. 3B schematically illustrates a part of FIG. 3A in an enlarged manner.

  As illustrated in FIG. 3A, the interior of the cushion portion 104 is partitioned into a rear chamber 108 and a front chamber 110 by a partition wall 120 in front and rear. The partition wall 120 includes a first member 122 and a second member 124 which are independent long cloth materials. The edges 126 and 128 of the first member 122 and the second member 124 located on the front side of the vehicle overlap with each other and are joined to each other by a sewing line 130. The first member 122 and the second member 124 joined in this manner are overlapped like a page to be bound as illustrated in FIG. 3A. In other words, the edges 126 and 128 of the first member 122 and the second member 124 are overlapped so as to form a mountain peak.

  The partition wall 120 further includes one or more (here, two) internal vent holes (hereinafter, simply referred to as vent holes) 132 and 134. The vent holes 132 and 134 are formed by the sewing line 130 being intermittent. That is, the sewing line 130 includes discontinuous sewing lines 130a, 130b, and 130c that are not continuous with each other. As illustrated in FIG. 3B, the vent hole 132 is formed by sewing portions 130 d and 130 e in which the sewing lines 130 a and 130 b are bent in the middle and interrupted at the edge portions 126 and 128 on the front side of the vehicle. Here, the sewn portions 130d and 130e include straight lines as shown in FIG. 3B from the point where the sewn lines 130a and 130d are bent halfway to the time when they are interrupted at the edges 126 and 128. The vent holes 132 can be easily defined by the sewing portions 130d and 130e including the straight lines.

  Similarly, the vent hole 134 is formed by sewing portions 130f and 130g in which the sewing lines 130b and 130c are bent in the middle and interrupted at the edge portions 126 and 128 on the vehicle front side. Here, the sewn portions 130f and 130g include straight lines as shown in FIG. 3A from the point where the sewn lines 130b and 130c are bent halfway to the time when they are interrupted at the edges 126 and 128. The sewn portions 130f and 130g including the straight line can easily define the vent hole 134.

  In this way, the vent holes 132 and 134 are defined and formed by the intermittent sewing lines 130a, 130b and 130c. For this reason, the vent holes 132 and 134 are open when the cushion portion 104 illustrated in FIG. 3A is in the middle of inflation and deployment and the partition wall 120 is slackened. Therefore, the gas supplied from the inflator 114 can be supplied from the rear chamber 108 side to the front chamber 110 side through these vent holes 132 and 134. Furthermore, since the straight lines included in the sewing portions 130d, 130e, 130f, and 130g that define the vent holes 132 and 134 are parallel to each other, the gas can pass through the vent holes 132 and 134 stably.

  Further, the airbag 100 further includes a diffuser 136 as illustrated in FIG. The diffuser 136 is provided as a rectifying member around the inflator 114 so that the rear chamber 108 and the front chamber 110 are efficiently filled with gas. The diffuser 136 is installed inside the rear chamber 108 so as to surround the inflator 114 in a cylindrical shape, and guides gas from the inflator 114 in the rear chamber 108 in the vertical direction. As a result, the gas is efficiently filled in the rear chamber 108, and the gas can easily flow from both the vent holes 132 and 134 toward the front chamber 110.

  FIG. 4 is a development view of the base fabric that forms the cushion portion 104 of FIG. FIG. 4B is a cross-sectional view taken along line AA of FIG. As illustrated in FIG. 4A, the partition wall 120 extends substantially vertically in the cushion portion 104 at the position where the vent holes 132 and 134 are formed. The partition wall 120 is provided to be inclined toward the front chamber 110 above the vent holes 132 and 134.

  The first member 122 and the second member 124 have the same shape, are overlapped with each other, and are joined by the sewing line 130 on the vehicle front side. Since the vent holes 132 and 134 are formed by the sewn portions 130d to 130g, the sewn portions 130d to 130g have, for example, a width in the vehicle front-rear direction.

  As shown in FIG. 4B, the first member 122 and the second member 124 extend from the inside of the cushion 104 toward the inside of the cushion 104. The first member 122 and the second member 124 are joined to one side and the other side of the base fabric 138 of the cushion portion 104 at the rear side of the vehicle by sewing lines 140 and 142, respectively. As described above, since the partition wall 120 can be formed using a cloth material different from the base cloth 138 of the cushion portion 104, it is easy to set an appropriate length (described later) and a shape required for the partition wall 120.

  FIG. 5 is a diagram illustrating an internal configuration when the inflation and deployment of the cushion portion 104 in FIG. 3A is completed. Here, a state in which the inflation and deployment of the cushion portion 104 is completed and the front chamber 110 is fully inflated and deployed is schematically shown. FIG. 5A illustrates a part of the partition wall 120 illustrated in FIG. 3A by a virtual line, and illustrates a difference in the shape of the partition wall 120 during and after inflation and deployment. FIG. 5B schematically illustrates a part of FIG. 5A in an enlarged manner, and illustrates a difference in the shape of the vent hole 132 during and after the expansion and deployment.

  During the expansion and deployment illustrated in FIG. 3A, the gas passes through the opened vent holes 132 and 134, so that the front chamber 110 expands and deploys. After that, when the inflation and deployment of the cushion portion 104 is completed and the front chamber 110 is fully inflated and deployed, the partition wall 120 changes from a sagging state shown by a virtual line to a solid line as shown in FIG. I get nervous.

  At this time, the dimension La of the stretched partition wall 120 in the sewing line direction along the sewing line 130 is set short enough so that the vent holes 132 and 134 are closed as illustrated in FIG. 5A. Have been. For example, as illustrated in FIG. 5B, when the partition wall 120 is pulled up and down as shown by arrows A and B, the first member 122 and the second member 124 Closed by approaching and touching as shown in D. Note that the vent hole 134 is closed with the same behavior.

  Therefore, when the front chamber 110 is fully inflated and deployed at the time of inflation and deployment of the cushion portion 104 and reaches a predetermined pressure, the partition wall 120 is in a stretched state, and the vent holes 132 and 134 function as check valves. Therefore, according to the present embodiment, when the pressure of the front chamber 110 reaches a predetermined pressure when the cushion portion 104 is inflated and deployed, the gas does not flow backward from the front chamber 110 to the rear chamber 108, and the front chamber 110 is maintained at the predetermined pressure. Can be.

  When the vent holes 132 and 134 are closed, the widths of the sewn portions 130d to 130g in the vehicle front-rear direction shown in FIG. Therefore, the vent holes 132 and 134 are securely closed by using the closing margin, and can sufficiently function as a check valve. However, if the dimension La is set short enough so that the vent holes 132 and 134 are securely closed in a state where the partition wall 120 is stretched, the sewing portions 130d to 130g may not be formed.

  Further, in the present embodiment, the sewing lines 130 for joining the first member 122 and the second member 124 are intermittently sewn, and the vent holes 132 and 134 functioning as check valves are easily formed on the partition wall 120. Can be formed.

  FIG. 6 is a diagram illustrating a modification of the cushion portion 104 and the partition wall 120 of FIG. 4B. In the airbag 100A of the modified example, the first member 122A and the second member 124A that constitute the partition wall 120A are not independent cloth materials but part of the base cloth 138A of the cushion portion 104A. It is different from the section 104 and the partition wall 120.

  According to such a modification, the partition wall 120A can be easily formed by extending the base cloth 138A of the cushion portion 104A. However, the base cloth 138A is a cloth forming the rear chamber 108A and the partition wall 120A, and is different from the base cloth 138B of the front chamber 110A. Therefore, in the modified example, as illustrated in FIG. 6, the base cloth 138B of the front chamber 110A is superimposed on the outside of the base cloth 138A of the rear chamber 108A, and sewn and joined by sewing lines 140A and 142A, respectively. What is necessary is just to form the cushion part 104A.

  In the modification illustrated in FIG. 6, both the first member 122 </ b> A and the second member 124 </ b> A are part of the base fabric 138 </ b> A of the cushion 104, but the invention is not limited to this. For example, only one of the first member 122A and the second member 124A is used as the base cloth 138A of the cushion section 104A, and the other is sewn to the base cloth 134 of the cushion section 104 as an independent cloth material shown in FIG. It may be.

  Further, in the above-described embodiment and the modified example, the case where the cushion portion is partitioned into two chambers by one partition wall has been described, but the present invention is not limited to this. Hereinafter, a case where the cushion portion is partitioned into three chambers by two partition walls will be described as an example.

  FIG. 7 is a diagram illustrating airbags 100B and 100C according to another embodiment of the present invention. In the airbag 100B illustrated in FIG. 7A, the interior of the cushion portion 104B is partitioned forward and backward by a partition wall 144, and further partitioned vertically by a partition wall 146. Therefore, the cushion portion 104B is partitioned into an upper rear chamber 148 in which the inflator 114 is installed, an upper front chamber 150, and a lower chamber 152.

  The partition wall 144 is provided with two vent holes 154 and 156. Further, a diffuser 158 is provided so as to surround the inflator 114 in a cylindrical shape. The diffuser 158 extends through the partition wall 146 and directs gas from the inflator 114 to the lower chamber 152 as well as to the upper rear chamber 148.

  In such an airbag 100B, when the cushion portion 104B is inflated and deployed, gas supplied from the inflator 114 is supplied to the upper rear chamber 148 and the lower chamber 152 via the diffuser 158. The gas supplied to the upper rear chamber 148 is supplied to the upper front chamber 150 through the vent holes 154 and 156 of the partition wall 144.

  Thus, in the airbag 100B, the gas is sequentially supplied to the three chambers of the cushion portion 104B, and the cushion portion 104B is inflated and deployed. When the upper front chamber 150, that is, the chamber that expands later, of the two adjacent chambers expands and reaches a predetermined pressure, the vent holes 154 and 156 function as check valves, and gas does not flow back to the upper rear chamber 148. , The upper front chamber 150 can be maintained at a predetermined pressure.

  In the airbag 100C illustrated in FIG. 7B, the inside of the cushion portion 104C is partitioned into front and rear and up and down by partition walls 160 and 162. Therefore, the cushion portion 104C is partitioned into an upper rear chamber 164 in which the inflator 114 is installed, an upper front chamber 166, and a lower chamber 168.

  A vent hole 170 is provided in the partition wall 160. Further, the partition wall 162 is provided with a vent hole 172 on the side that partitions the upper front chamber 166 and the lower chamber 168. A diffuser 174 is provided around the inflator 114 to penetrate the partition wall 162 and guide the gas not only to the upper rear chamber 164 but also to the lower chamber 168.

  In such an airbag 100C, when the cushion portion 104C is inflated and deployed, the gas supplied from the inflator 114 is supplied to the upper rear chamber 164 and the lower chamber 168 via the diffuser 174. The gas supplied to the upper rear chamber 164 is supplied to the upper front chamber 166 through the vent hole 170 of the partition wall 160. On the other hand, the gas supplied to the lower chamber 168 is also supplied to the upper front chamber 166 through the vent hole 172 of the partition wall 162.

  Thus, in the airbag 100C, the gas is sequentially supplied to the three chambers of the cushion portion 104C, and the cushion portion 104C is inflated and deployed. When the upper front chamber 166, that is, the chamber that expands later, of the two adjacent chambers expands and reaches a predetermined pressure, the vent holes 170 and 172 function as check valves, and gas flows into the upper rear chamber 164 and the lower chamber 168. And the upper front chamber 166 can be maintained at a predetermined pressure.

  Therefore, even when the cushion portion is divided into three chambers by two partition walls as in the airbags 100B and 100C, the gas is supplied through the vent holes by using the vent holes functioning as the check valves. Can be maintained at a predetermined pressure.

  As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can conceive various changes or modifications within the scope of the claims, and these naturally belong to the technical scope of the present invention. I understand.

  Further, in the above embodiment, the example in which the side airbag device according to the present invention is applied to an automobile has been described, but it is also possible to apply the invention to an aircraft or a ship other than an automobile, and to obtain the same operation and effect. Can be.

  INDUSTRIAL APPLICATION This invention can be utilized for the side airbag apparatus which expands and deploys between an occupant and the side wall part etc. in a vehicle interior, and restrains an occupant when an impact arises in a vehicle.

100, 100A, 100B, 100C: airbag, 102: seat, 104, 104A, 104B, 104C: cushion part, 106: seat back, 108, 108A: rear chamber, 110, 110A: front chamber, 112: occupant, 114 ... inflator, 116 ... stud bolt, 118 ... exhaust hole, 120, 120A, 144, 146, 160, 162 ... partition wall, 122, 122A ... first member, 124, 124A ... second member, 126 ... first member Edge, 128: Edge of the second member, 130, 130a, 130b, 130c, 140, 140A, 142, 142A: Sewing line, 130d, 130e, 130f, 130g: Sewing part, 132, 134, 154, 156, 170, 172 ... vent holes, 136, 158, 174 ... Ifuyuza, 138,138A, base fabric 138B ... cushion unit, 148, 164 ... upper rear chamber, 150, 166 ... upper front chamber, 152,168 ... lower chamber

Claims (17)

A side airbag device that expands and deploys to the side of an occupant of a vehicle seat to restrain the occupant,
A bag-shaped cushion part,
An inflator for supplying gas to the cushion portion to inflate and deploy,
The cushion portion,
A first chamber for directly receiving a supply of gas from the inflator;
A second chamber located on the vehicle front side of the first chamber and receiving a supply of gas from the inflator through the first chamber;
A partition wall for partitioning the first chamber and the second chamber;
The partition wall,
A first member and a second member extending from the inside of the cushion portion toward the inside of the cushion portion;
A sewing line for intermittently sewing the first member and the second member;
One or more internal vent holes formed by the interruption of the sewing line;
The partition wall extends in the up-down direction inside the cushion portion and bends and extends so as to be depressed with respect to the second chamber. The expansion and deployment of the cushion portion is started, and the second chamber is moved to a predetermined position. The side airbag device is characterized in that after reaching the internal pressure, the partition wall is in a tensioned state and the internal vent hole is closed. The size of the partition wall in the sewing line direction is set to be short so that after the second chamber reaches a predetermined internal pressure, the internal vent hole is closed while the partition wall is stretched. The side airbag device according to claim 1, wherein The first member and the second member respectively extend forward and inward from the inside of the cushion portion from both side surfaces inside the cushion portion,
The side airbag device according to claim 1, wherein the sewing line extends in a vertical direction. The first member and the second member are in a state of being overlapped like a page to be bound and joined by the sewing line,
4. The sewing machine according to claim 1, wherein the inner vent hole is formed by the sewing line being bent in the middle and interrupted at an edge of the first member and the second member. 5. The side airbag device as described in the above.   The sewing line according to claim 4, wherein the sewing line forming the internal vent hole includes a straight line from a bent portion in the middle to a stop at an edge of the first member and the second member. Airbag device.   The side airbag device according to claim 5, wherein the sewing line includes two parallel straight lines.   7. The device according to claim 1, wherein at least one of the first member and the second member is an independent cloth material, and is sewn and joined to a base cloth of the cushion portion. The side airbag device as described in the above.   The side airbag device according to any one of claims 1 to 7, wherein at least one of the first member and the second member is a part of a base fabric of the cushion portion. The first chamber is a rear chamber on a vehicle rear side,
9. The side airbag device according to claim 1, wherein the second chamber is a front chamber on a vehicle front side. 10. A side airbag device which inflates and deploys to the side of an occupant of a vehicle seat to restrain the occupant,
A bag-shaped cushion part,
An inflator for inflating and deploying gas by supplying gas to the cushion portion;
One or more partition walls that partition the interior of the cushion portion into a plurality of chambers,
Each of the partition walls,
A first member and a second member extending from the inside of the cushion portion toward the inside of the cushion portion;
A sewing line for intermittently sewing the first member and the second member;
One or more internal vent holes formed by interruption of the sewing line;
The internal vent hole is provided at a predetermined location on each of the partition walls so that gas is supplied to all other chambers sequentially from one or more predetermined chambers that directly receive supply of gas from the inflator. Have been
Each of the partition walls extends up and down the interior of the cushion portion, and bends and extends so as to be depressed with respect to a chamber that expands late among two adjacent chambers that each of the partition walls partition , The side airbag device is characterized in that, after the chamber that expands late reaches a predetermined internal pressure, each of the partition walls is in a taut state and the internal vent hole is closed. The size of each of the partition walls in the direction of the sewing line is set to be short so that the inner vent hole is closed in a state where each of the partition walls is stretched after the chamber that expands late reaches a predetermined internal pressure. The side airbag device according to claim 10, wherein: The first member and the second member are in a state of being overlapped like a page to be bound and joined by the sewing line,
The side airbag according to claim 10, wherein the internal vent hole is formed by the sewing line being bent in the middle and interrupted at an edge of the first member and the second member. apparatus.   13. The side according to claim 12, wherein the sewing line forming the internal vent hole includes a straight line from a bent portion to a stop at an edge of the first member and the second member. Airbag device.   14. The side airbag device according to claim 13, wherein the sewing line includes two parallel straight lines.   The side airbag device according to any one of claims 10 to 14, wherein there are two predetermined chambers that directly receive the supply of gas from the inflator.   16. The side airbag device according to claim 15, further comprising a diffuser mounted on the inflator and configured to supply gas from the inflator to the two predetermined chambers at the same time.   The side airbag according to any one of claims 10 to 14, wherein the predetermined chamber that directly receives the supply of gas from the inflator is one, and the other chamber is plural. apparatus.

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