JP5471026B2 - Vehicle seat with side airbag device - Google Patents

Description

  The present invention relates to a vehicle seat provided with a side airbag device, and more specifically, when a side collision occurs in a vehicle, an airbag bag body accommodated in an airbag case is inflated by a gas ejected from an inflator. A side airbag device is provided that spreads the pad member in the state and tears a predetermined stitching portion in the seat back cover and expands the seat bag cover outside by expanding the airbag bag body in the expanded state. Relates to a vehicle seat.

  Conventionally, when a side collision occurs in a vehicle, an airbag bag body accommodated in a seat back is expanded by gas ejected from an inflator to expand the pad member. 2. Description of the Related Art There is known a vehicle seat including a side airbag device that expands toward the outside of a seat back while tearing a seat back cover that covers the surface of a pad member by expanding a back bag body. Here, the following Patent Document 1 discloses a technique in which a slit is formed in the pad member in advance and the pad member is pushed through the slit. Accordingly, when the airbag bag body is deployed toward the outside of the seat back, the pad member can be prevented from being broken and scattered.

JP-A-8-258661

  However, in the above-described prior art, even if the airbag bag body starts to be inflated, the inflation direction is not restricted until the airbag bag body reaches the slit. Sometimes expanded in an unintended direction. For this reason, the airbag bag body could not be smoothly deployed outside the seat back.

  The present invention is intended to solve such a problem, and an object thereof is to provide a vehicle seat including a side airbag device that can smoothly deploy an airbag bag body toward the outside of the seat back. It is to be.

The present invention is for achieving the above object, and is configured as follows. According to the first aspect of the present invention, when a side collision occurs in the vehicle, the airbag bag body accommodated in the seat back expands by the gas ejected from the inflator, thereby expanding the pad member. The vehicle seat further includes a side airbag device that tears a predetermined stitched portion in the seat back cover and expands toward the outside of the seat back when the airbag bag body is inflated. bag is housed inside the seat back in a state of being bonded to the rear surface of the pad member, the predetermined sewing portion is formed on an extension of the deployment path formed by the pad member is widened The joined state between the airbag bag body and the back surface of the pad member is that the front end of the airbag bag body enters the recess formed on the back surface of the pad member. Characterized in that it is a good.
According to this configuration, the inflation direction of the airbag bag body can be restricted from when gas is ejected from the inflator. Therefore, the airbag bag body does not expand in an unintended direction, and the airbag bag body can be smoothly deployed toward the outside of the seat back.

The invention according to claim 2 is the vehicle seat including the side airbag device according to claim 1, wherein the airbag bag body starts to expand when gas is ejected from the inflator. And the second inflatable part that is pulled by the inflating of the first inflating part and starts to inflate, and the first inflating part in the airbag bag body is the back surface of the pad member. The seat member is housed inside the seat back in a state where the pad member is joined to a position where the pad member starts to be expanded by its own expansion.
According to this configuration, the airbag bag body can be deployed more smoothly toward the outside of the seat back.

FIG. 1 is an overall perspective view showing a schematic configuration of a passenger seat according to the first embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cross-sectional view showing a state in which the airbag bag body starts to expand from the state of FIG. FIG. 4 is a cross-sectional view showing a state where the airbag bag body is further expanded from the state of FIG. 3 and the pad member is expanded by the expansion. FIG. 5 is a cross-sectional view showing a state in which the airbag bag body further expands from the state of FIG. 4 and the airbag bag body is unfolded by tearing the stitched portion of the seat back cover by the expansion. FIG. 6 is an overall perspective view showing a schematic configuration of a passenger seat according to the second embodiment of the present invention. 7 is a cross-sectional view taken along line BB in FIG. FIG. 8 is a cross-sectional view showing a state in which the airbag bag body starts to expand from the state of FIG. FIG. 9 is a cross-sectional view showing a state where the airbag bag body is further expanded from the state of FIG. 8 and the pad member is expanded by the expansion. FIG. 10 is a cross-sectional view showing a state in which the airbag bag body further expands from the state of FIG. 9 and the airbag bag body is unfolded by tearing the stitched portion of the seat back cover by the expansion. FIG. 11 is a cross-sectional view of a passenger seat according to the third embodiment of the present invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Example 1
First, Example 1 of the present invention will be described with reference to FIGS. In the following description, an example in which a vehicle seat is applied to the passenger seat 1 will be described. In the following description, the terms “up”, “down”, “front”, “rear”, “left”, and “right” refer to the directions of “up”, “down”, “front”, “rear”, “left”, and “right” as described above. Up, down, front, back, left and right directions are shown. The same applies to Examples 2 and 3 described later.

  First, a schematic configuration of the passenger seat 1 according to the first embodiment of the present invention will be described with reference to FIGS. The passenger seat 1 includes a seat cushion 10, a seat back 12, and a headrest 14. The seat back 12 will be described in detail. A side airbag device 40 is assembled to the seat back 12 on the left side surface of the back frame 20.

  The side airbag device 40 includes a cylindrical inflator 62 and an airbag bag body 64 that is inflated by gas ejected from an ejection port 62 a of the inflator 62. The inflator 62 is electrically connected to a side collision detection sensor (for example, ECU) via a cable (not shown). When the inflator 62 receives a side collision occurrence signal from the side collision detection sensor, the inflator 62 instantaneously ejects gas.

  The inflator 62 is assembled to the left side surface of the back frame 20 via bolts 66 and nuts 68. Thereby, the side airbag apparatus 40 can be provided in the back side inside the seat back 12. FIG. Therefore, when the vehicle does not have a side collision, the pad member 22 can have a sufficient thickness and does not adversely affect the sitting comfort of the occupant. Therefore, it is possible to ensure the comfort of the passenger.

  The airbag bag body 64 includes a first inflating portion 64a formed forward from the jet port 62a of the inflator 62, and a plurality of second inflating portions formed in the left-right direction during the formation. It is comprised from the expansion part 64b. With such a configuration, when the airbag bag body 64 is inflated, the first inflatable portion 64a starts to inflate before the second inflatable portion 64b, and is pulled by the inflating, thereby the second inflatable portion. 64b begins to expand. This description is described in the claims, “The airbag bag body is inflated by being pulled by the expansion of the first inflating portion and the first inflating portion that starts to expand when gas is ejected from the inflator. It is comprised from the 2nd expansion part which starts. "

  The airbag bag body 64 is folded and stored in the seat back 12 while being connected to the jet port 62 a of the inflator 62. The airbag bag body 64 is configured to be instantaneously deployed when the inflator 62 ejects gas. Note that the airbag bag body 64 is kept in a thin state (for example, about 7 to 8 cm) in the width direction so that the airbag bag body 64 does not expand toward the occupant at the time of deployment. It is formed to develop. The side airbag device 40 is configured in this way.

  The first inflatable portion 64a in the airbag bag body 64 is joined to a predetermined position on the back surface of the pad member 22 via a joining member 50 (for example, an adhesive, stitching with a thread, etc.). The predetermined position is, for example, a position where a line connecting a jet port 62 a of the inflator 62 and a stitching portion 32 described later intersects with the back surface of the pad member 22. This description is described in the claims, “The first inflatable portion of the airbag bag body is joined to the back surface of the pad member at a position where the pad member starts to be expanded due to its expansion. Corresponds to “contained inside”.

  On the other hand, the seat back 12 covers the back frame 20 with the pad member 22 to which the first inflating portion 64a of the airbag bag body 64 is joined, and the bolts 66 and the nuts 68 are interposed in the covered state as described above. The inflator 62 is assembled to the left side surface of the back frame 20, and the seat back cover 24 is further put on the assembled state. Further, a back surface material (for example, cloth) 22 a is attached to the back surface of the pad member 22. Thereby, the pad member 22 can be made difficult to tear.

  The seat back cover 24 includes a front cover 26 that mainly covers the front surface of the pad member 22 (the left and right top plate portions and the top plate main portion of the seat back 12) and a side cover 28 that mainly covers the side surfaces of the pad member 22. It is constructed by sewing with a thread 30 (see a partially enlarged view of FIG. 2). The stitching portion 32 is formed so as to be positioned on an extension of the deployment passage (deployment passage) 70 when the airbag bag body 64 is deployed by expanding the pad member 22 (see FIG. 4). ). The stitched portion 32 corresponds to a “predetermined stitched portion” described in the claims.

  In addition, the stitching portion 32 is sewn so that the thread 30 is not broken at a normal time when no side collision occurs in the vehicle. On the other hand, when the airbag bag body 64 is deployed, the thread 30 is sewn. 30 is sewn so as to be torn by expansion of the airbag bag body 64. The seat back 12 is configured in this way.

  Then, with reference to FIGS. 2-5, the effect | action of the passenger seat 1 which consists of the structure mentioned above is demonstrated. When a side collision occurs in the vehicle from the state shown in FIG. 2, as described above, the airbag bag body 64 is expanded by the gas ejected from the ejection port 62 a of the inflator 62. At this time, as already described, in the airbag bag body 64, the first inflatable portion 64a is inflated before the second inflatable portion 64b (see FIG. 3).

  Then, the pad member 22 is pushed and expanded by the inflated first inflatable portion 64a to form a passage (deployment passage) 70 in which the airbag bag body 64 is deployed (see FIG. 4). Further, when the airbag bag body 64 is inflated and the bulge of the first inflatable portion 64a is increased, the second inflatable portion 64b is also inflated by being pulled by the bulge. Further, when the airbag bag body 64 expands and the swelling of the second inflatable portion 64b increases, the airbag bag body 64 tears the thread 30 of the stitching portion 32 of the seat back cover 24 and deploys outside the seat back 12. (See FIG. 5). Thereby, it is possible to prevent an impact when a side collision occurs in the vehicle from reaching the seated occupant.

  The passenger seat 1 according to the embodiment of the present invention is configured as described above. According to this configuration, the airbag bag body 64 is housed inside the seat back 12 in a state of being bonded to the back surface of the pad member 22 via the bonding member 50. Therefore, the inflation direction of the airbag bag body 64 can be regulated from when gas is ejected from the inflator 62. Therefore, the airbag bag body 64 does not expand in an unintended direction, and the airbag bag body 64 can be smoothly deployed toward the outside of the seat back 12.

  Further, according to this configuration, the airbag bag body 64 is inflated by being pulled by the first inflating portion 62a that starts to inflate when gas is ejected from the inflator 62 and the inflating of the first inflating portion 62a. It is comprised from the 2nd expansion part 62b which starts. And the 1st expansion part 64a in the airbag bag body 64 is accommodated in the seat back 12 in the state joined to the position which begins to expand the pad member 22 by its expansion | swelling among the back surfaces of the pad member 22. Yes. Therefore, the airbag bag body 64 can be more smoothly deployed toward the outside of the seat back 12.

(Example 2)
Next, Example 2 of the present invention will be described with reference to FIGS. In the first embodiment, the airbag bag body 64 has been described in the embodiment in which the second inflatable portion 64b is formed during the formation of the first inflatable portion 64a. On the other hand, in Example 2 to be described, the airbag bag body 164 is an embodiment in which the second inflating portion 164b is formed inside the first inflating portion 164a formed on the left and right. Therefore, in the following description, the same components as those in the first embodiment are denoted by the same reference numerals in the drawings, and redundant description is omitted. The same applies to Example 3 described later.

  First, a schematic configuration of the passenger seat 101 according to the second embodiment of the present invention will be described with reference to FIGS. A side airbag device 140 is assembled to the seat back 12 of the passenger seat 101 on the left side surface of the back frame 20. The side airbag device 140 includes a cylindrical inflator 62 and an airbag bag body 164 that is inflated by gas ejected from the ejection port 62 a of the inflator 62.

  The airbag bag body 164 has first inflated portions 164a and 164a that are curved forward and leftward from the jet port 62a of the inflator 62, and a shape that is sandwiched between the first inflated portions 164a. And a second inflatable portion 164b. Both the first inflatable portions 164a in the airbag bag body 164 are joined to a predetermined position on the back surface of the pad member 22 via the joining member 50, similarly to the first inflatable portion 64a in the first embodiment. .

  At this time, both the first inflating portions 164a are joined in a state where the outside thereof is pulled (a state corresponding to when the airbag bag body 164 is inflated). On the other hand, the insides of the first inflating portions 164a and the second inflating portion 164b are in a slack state. Thus, when the airbag bag body 164 is inflated, both the first inflatable portions 164a can be inflated prior to the second inflatable portion 164b, similarly to the airbag bag body 64 of the first embodiment. The second expansion part 164b can be expanded by being pulled by the expansion. Thereby, the second expansion portion 164b can be reliably expanded toward the predetermined stitching portion 32. The airbag bag body 164 is folded and stored in the seat back 12 while being connected to the jet port 62 a of the inflator 62.

  And the airbag bag body 164 becomes a structure which expand | deploys instantly, when the inflator 62 ejects gas similarly to the airbag bag body 64 of Example 1. FIG. Further, the airbag bag body 164 has a thin thickness in the width direction (for example, about 7 to 8 cm) so that the airbag bag 164 does not expand toward the occupant during the deployment. It is formed to develop. The side airbag device 140 is configured in this way.

  Next, the operation of the passenger seat 101 having the above-described configuration will be described with reference to FIGS. When a side collision occurs in the vehicle from the state shown in FIG. 7, as described above, the airbag bag body 164 is expanded by the gas ejected from the ejection port 62 a of the inflator 62. At this time, as already described, in the airbag bag body 164, both the first inflatable portions 164a are inflated before the second inflatable portion 164b (see FIG. 8).

  Then, a passage (deployment passage) 70 in which the pad member 22 is pushed and expanded by the inflated first inflatable portions 164a and the airbag bag body 64 is deployed is formed (see FIG. 9). Further, when the airbag bag body 164 expands and the bulges of the first inflatable portions 164a increase, the second inflatable portion 164b is also inflated by being pulled by the bulges. Further, when the airbag bag body 164 expands and the expansion of the second expansion portion 164b increases, the airbag bag body 164 tears the stitched portion 32 of the seat back cover 24 and expands outside the seat back 12. (See FIG. 10). Thereby, it is possible to prevent an impact when a side collision occurs in the vehicle from reaching the seated occupant.

  The passenger seat 101 according to the second embodiment of the present invention is configured as described above. According to this configuration, the airbag bag body 164 is housed inside the seat back 12 in a state where the airbag bag body 164 is bonded to the back surface of the pad member 22 via the bonding member 50, similarly to the airbag bag body 64 of the first embodiment. ing. Therefore, the same effect as the passenger seat 1 of Example 1 can be obtained.

(Example 3)
Finally, Example 3 of the present invention will be described with reference to FIG. In the first embodiment, the airbag bag body 64 has been described in the embodiment in which the second inflatable portion 64b is formed in the left-right direction during the formation of the first inflatable portion 64a. On the other hand, in Example 3, the airbag bag body 264 is an embodiment in which the second inflating portion 264b is formed in the rearward direction during the formation of the first inflating portion 264a. Even if it forms in this way, the effect similar to the passenger seat 1 of Example 1 can be acquired.

The contents described above relate to an embodiment of the present invention, and do not mean that the present invention is limited to the above contents.
In each embodiment, the example in which the vehicle seat is applied to the passenger seats 1, 101, 201 has been described. However, the present invention is not limited to this, and a vehicle seat may be applied to the driver's seat. In that case, the side airbag devices 40, 140, and 240 are assembled to the right side surface of the back frame 20.

1 Passenger seat (vehicle seat)
12 seat back 22 pad member 24 seat back cover 32 stitching portion 40 side airbag device (Example 1)
62 Inflator 64 Airbag Body 64a First Inflatable Part 64b Second Inflatable Part 140 Side Airbag Device (Example 2)
164a First inflatable portion 164b Second inflatable portion 240 Side airbag device (Example 3)
H.264a 1st expansion part 264b 2nd expansion part

Claims (2)

When a side collision occurs in the vehicle, the airbag bag body accommodated in the seat back is expanded by the gas ejected from the inflator to expand the pad member, and in this expanded state, the airbag bag is further expanded. A vehicle seat including a side airbag device that tears a predetermined stitching portion in a seat back cover and expands toward the outside of the seat back by expanding the body,
The airbag bag body is housed inside the seat back in a state of being bonded to the back surface of the pad member,
The predetermined stitching portion is formed on an extension of the deployment passage formed by the pad member being pushed and spread ,
The side airbag is characterized in that the airbag bag body and the back surface of the pad member are joined together such that the front end of the airbag bag body enters a recess formed in the back surface of the pad member. Vehicle seat equipped with the device. A vehicle seat comprising the side airbag device according to claim 1,
The airbag bag body includes a first inflatable portion that starts to expand when gas is ejected from the inflator, and a second inflatable portion that starts to expand by being pulled by the expansion of the first inflatable portion. ,
The first inflatable portion in the airbag bag body is housed inside the seat back in a state where the first inflated portion is joined to a position on the back surface of the pad member where the pad member starts to be expanded by its expansion. A vehicle seat equipped with an airbag device.

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