JP5343700B2 - 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 the vehicle, an airbag bag body accommodated inside the seat back expands to spread the pad member, Further, the present invention relates to a vehicle seat including a side airbag device that tears a predetermined stitching portion in a seat back cover and expands the seat bag cover toward the outside by expanding the airbag bag body in the expanded state.

  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, Patent Document 1 below discloses a technique in which a slit is formed in the pad member in advance, and the airbag bag body expands and expands the pad member 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, until the airbag bag body reaches the slit, the inflation direction is not regulated inside the seat back. 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 to expand the pad member. A vehicle seat provided with a side airbag device that tears a predetermined stitching portion in a seat back cover and expands outward from the seat back when the back bag body expands, and the airbag bag body is attached to the pad member It is housed inside the seat back in a state of being joined to the back surface of the seat back cover through the formed slit, and the front end of the airbag bag body has a predetermined stitching portion on the back surface of the seat back cover. The folded cloth is sewn to both ends of the predetermined stitched portion, and the folded end of the airbag bag body is attached to the both folded cloths. Accordingly, characterized in that it is joined so as to be sandwiched.
According to this configuration, the inflation direction of the airbag bag body can be regulated from the time when the airbag bag body starts to expand. Therefore, the airbag bag body does not expand in an unintended direction inside the seat back, and the airbag bag body can be smoothly deployed 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 a cross-sectional view of a passenger seat according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view of a passenger seat according to the third embodiment of the present invention. FIG. 8 is a sectional view of a passenger seat according to the fourth 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 to 4 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.

  On the other hand, the airbag bag body 64 is folded in a slender shape so as to overlap in the left-right direction, and a second inflated portion extends from the tip of the first inflatable portion 64a. It is comprised from the expansion part 64b. If comprised in this way, when the airbag bag body 64 is inflated, the first inflatable portion 64a can be inflated before the second inflatable portion 64b.

  The airbag bag body 64 is housed inside the seat back 12 with the proximal end side of the first inflating portion 64 a connected to the jet port 62 a of the inflator 62. Therefore, 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.

  In addition, the airbag bag body 64 has both ends of the second inflatable portion 64b at both ends at the front cover 26 and side cover 28, which will be described later, on folded cloths 26a, 28a via thread 34. Are sewn together. This description corresponds to “the airbag bag body is joined at a position near the predetermined stitched portion of the back surface of the seat back cover” described in the claims.

  In order to sew in this manner, the pad member 22 is previously provided with a slit (slit that allows the inside and the outside of the pad member 22 to communicate from the inside of the pad member 22 to the stitching portion 32 of the seat back cover 24) 22b. Is formed. Therefore, it is not necessary to tear the pad member 22 when the airbag bag body 64 is inflated, and the pad member 22 can be prevented from being broken and scattered. The side airbag device 40 is configured in this way.

  Further, the seat back 12 covers the back frame 20 with the pad member 22, and further covers the seat back cover 24 in which the second inflating portion 64b is stitched, and the bolt 66 and the nut are further covered. The inflator 62 is assembled to the left side surface of the back frame 20 via 68. 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.

  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 The airbag bag body 64 is sewn so as to be torn by expansion. In addition, it is preferable that the stitching strength in the stitching portion 32 is sewn to be weaker than the stitching strength in the second inflatable portion 64b described above from the viewpoint of regulating the deployment 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. At this time, as already explained, the first inflating part 64a is inflated before the second inflating part 64b (see FIG. 3). Further, when the airbag bag body 64 is inflated, the second inflatable portion 64b is also inflated, and the passage (deployment passage) in which the slit 22b of the pad member 22 is pushed and expanded to expand the airbag bag body 64. ) 70 is formed (see FIG. 4).

  Further, when the airbag bag body 64 is deployed and the expansion space of the slit 22b disappears, the airbag bag body 64 tears the thread 30 of the stitching portion 32 of the seat back cover 24 and deploys the seat bag 12 to the outside. . At this time, the thread 34 stitching the second inflatable portion 64b is also torn (see FIG. 5). By developing in this way, it is possible to prevent the impact when a side collision occurs on 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 where the second inflated portion 64 b is stitched to the back surface of the seat back cover 24 via the thread 34. 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 inside the seat back 12, 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 64 has the second inflated portion 64 b stitched to both ends of the front cover 26 and the side cover 28. That is, the airbag bag body 64 has its second inflated portion 64 b sewn at a position near the stitching portion 32 on the back surface of the seat back cover 24. Therefore, the airbag bag body 64 can be more smoothly deployed toward the outside of the seat back 12.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the embodiment in which the second inflating portion 64b of the airbag bag body 64 in the passenger seat 1 is formed in a substantially linear shape has been described. On the other hand, Example 2 is an embodiment in which the second inflatable portion 64b of the airbag bag body 64 in the passenger seat 101 is formed in a substantially T shape. Therefore, in the following description, members having the same or equivalent configuration as in the first embodiment are denoted by the same reference numerals in the drawings, and redundant description is omitted. The same applies to Examples 3 and 4 described later.

  In the airbag bag body 64 of the second embodiment, the substantially T-shaped ends of the second inflatable portion 64b are threaded on the folded cloths 26a, 28a sewn to both ends of the front cover 26 and the side cover 28. 34, respectively. As described above, the passenger seat 101 in the second embodiment is different from the passenger seat 1 in the first embodiment only in the shape of the second inflatable portion 64b in the airbag bag body 64, and the other configurations are the same. . Therefore, the airbag bag body 64 of the second embodiment can be inflated similarly to the airbag bag body 64 of the first embodiment. Therefore, the passenger seat 101 in the second embodiment can obtain the same effects as the passenger seat 1 in the first embodiment.

(Example 3)
Next, Embodiment 3 of the present invention will be described with reference to FIG. In the first and second embodiments, among the airbag bags 64 in the passenger seats 1 and 101, the first inflated portion 64 a housed in the seat back 12 in a slack state is connected to the jet port 62 a of the inflator 62. The embodiment is formed on the other side. On the other hand, in the third embodiment, in the airbag bag body 64 in the passenger seat 201, the first inflated portion 64a housed in the seat back 12 in a slack state is the front end side of the second inflatable portion 64a. It is embodiment currently formed toward the inside.

  In the airbag bag body 64 of the third embodiment, the front ends of the left and right second inflatable portions 64b and 64b are threaded onto the folded cloths 26a and 28a sewn to both ends of the front cover 26 and the side cover 28. 34, respectively. As described above, the passenger seat 201 in the third embodiment is different from the passenger seats 1 and 101 in the first and second embodiments only in the arrangement position of the first inflatable portion 64a in the airbag bag body 64. The configuration is the same. Therefore, the airbag bag body 64 of the third embodiment can be inflated similarly to the airbag bag body 64 of the first and second embodiments. Therefore, the passenger seat 201 in the third embodiment can obtain the same effects as the passenger seats 1 and 101 in the first and second embodiments.

  In addition, the left and right second inflating portions 64b and 64b in the third embodiment are sewn so that the outer side thereof is pulled (a state corresponding to when the airbag bag body 64 is inflated). Thereby, when the airbag bag body 64 is inflated, the first inflatable portion 64a can be inflated more smoothly toward the stitching portion 32 of the seat back cover 24.

Example 4
Finally, Example 4 of the present invention will be described with reference to FIG. In the third embodiment, the embodiment in which the left and right second inflating portions 64b and 64b of the airbag bag body 64 in the passenger seat 201 are formed in a substantially linear shape has been described. On the other hand, Example 4 is an embodiment in which the left and right second inflating portions 64b and 64b of the airbag bag body 64 in the passenger seat 301 are formed in a substantially L shape.

  In the airbag bag body 64 of the fourth embodiment, the front ends of the left and right second inflatable portions 64b and 64b are threaded on the folded cloths 26a and 28a sewn to both ends of the front cover 26 and the side cover 28. 34, respectively. As described above, the passenger seat 301 in the fourth embodiment is different from the passenger seat 201 in the third embodiment only in the shapes of the left and right second inflatable portions 64b and 64b in the airbag bag body 64, and other configurations. Are the same. Therefore, the airbag bag body 64 of the fourth embodiment can be inflated similarly to the airbag bag body 64 of the third embodiment. Therefore, the passenger seat 301 in the fourth embodiment can also obtain the same effects as the passenger seat 201 in the third embodiment, that is, the same effects as the passenger seats 1 and 101 in the first and second embodiments.

  In addition, the left and right second inflating portions 64b and 64b in the fourth embodiment are also sewn so that the outside thereof is pulled (a state corresponding to when the airbag bag body 64 is inflated). Thereby, when the airbag bag body 64 is inflated, the first inflatable portion 64a can be inflated more smoothly toward the stitching portion 32 of the seat back cover 24.

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, and 301 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, 240, and 340 are assembled to the right side surface of the back frame 20.

1 Vehicle seat (Example 1)
DESCRIPTION OF SYMBOLS 12 Seat back 22 Pad member 22b Slit 24 Seat back cover 32 Predetermined stitching part 40 Side airbag apparatus 64 Air bag body 101 Vehicle seat (Example 2)
201 Vehicle seat (Example 3)
301 Vehicle seat (Example 4)

Claims (1)

When a side collision occurs in the vehicle, the airbag bag body accommodated in the seat back expands to expand the pad member, and in this expanded state, the airbag bag body expands further to expand the seat A vehicle seat provided with a side airbag device that tears a predetermined stitching portion in a back cover and expands the seat back toward the outside,
The airbag bag body is housed inside the seat back in a state of being joined to the back surface of the seat back cover through a slit formed in the pad member ,
The front end of the airbag bag body is joined to the vicinity of a predetermined stitched portion on the back surface of the seat back cover,
Folded cloth is sewn on both ends of the predetermined stitching part,
A vehicle seat provided with a side airbag device, wherein the front end of the airbag bag body is joined so as to be sandwiched between both folded cloths .

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