JP2016203946A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat capable of effectively absorbing energy exerted when an occupant is restrained by an airbag body.SOLUTION: A seat 1 includes: a headrest 4; a seat frame 13 which supports at least the headrest 4; an airbag body 33 which is incorporated into the headrest 4 and expanded so as to cover at least the head of an occupant by a gas supplying thereto; and a fragile part 50 which is provided in the seat frame 13 and deformable so as to displace the headrest 4 forward when the occupant is restrained by the airbag body 33.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle seat.

2. Description of the Related Art Conventionally, there has been known a vehicle seat that incorporates an airbag device that inflates and deploys an airbag bag so as to cover an occupant's head when an impact is input to the vehicle and restrains the occupant's head. (For example, see Patent Document 1 and Patent Document 2).
In general, an airbag device has a configuration for absorbing energy that acts when an occupant is restrained. Specifically, the airbag device can appropriately set the size of the vent hole formed in the airbag bag body, the output of the inflator for inflating and deploying the airbag bag body, the shape of the airbag bag body, and the like. It is configured to be able to absorb energy that acts when restrained.

JP 2008-74248 A JP 2013-18378 A

  However, the time until the occupant comes into contact with the airbag bag body and the contact position with the airbag bag body vary depending on the seating position and physique of the occupant. For this reason, there is room for improvement in terms of effectively absorbing the energy that acts when the passenger is restrained regardless of the seating position or physique of the passenger.

  Therefore, the present invention provides a vehicle seat that can effectively absorb energy acting when an airbag bag body is restrained by an occupant.

In order to solve the above-described problems, a vehicle seat of the present invention (for example, the vehicle seat 1 of the embodiment) includes a headrest (for example, the headrest 4 of the embodiment) and at least a frame portion that supports the headrest (for example, implementation). A seat frame 13), and an airbag bag body (for example, the airbag bag body 33 of the embodiment) that is built in the headrest and is deployed so as to cover at least the head of the occupant by supplying gas. A fragile portion (for example, the fragile portion 50 of the embodiment) provided in the frame portion and deformable so as to displace the headrest forward when the occupant is restrained by the airbag bag body. And
When an impact is input to the vehicle and the occupant's head moves forward due to inertia, the occupant's head contacts the airbag bag.
According to the present invention, since the weak portion that can be deformed so as to displace the headrest toward the front is provided, the energy when the head of the occupant comes into contact with the airbag bag body passes through the airbag bag body and the headrest. Is transmitted to the frame portion. At this time, the fragile portion of the frame portion is deformed so as to displace the headrest toward the front, so that the energy transmitted to the frame portion can be absorbed. In this manner, energy acting on the airbag bag body can be transmitted to the frame portion and absorbed regardless of the seating position or physique of the occupant. Therefore, it can be set as the vehicle seat which can absorb effectively the energy which acts at the time of the passenger | crew restraint of an airbag bag body.

In the above vehicle seat, it is desirable that the fragile portion is a notch portion (for example, the notch portion 18 in the embodiment) provided at the rear portion of the frame portion.
According to the present invention, since the strength of the frame portion can be locally reduced by the cutout portion, the fragile portion can be provided with a simple configuration. In addition, since the notch portion is provided at the rear portion of the frame portion, when the airbag bag body restrains the head of the occupant and the forward energy acts on the headrest, the notch portion of the frame portion is The corresponding portion is deformed, and the headrest can be easily displaced forward. Therefore, the headrest can be made into a fragile part that can be easily displaced toward the front, and the energy acting when the airbag bag body is restrained by the passenger can be effectively absorbed.

In the above vehicle seat, the frame portion extends from the headrest and is a headrest pillar (for example, the headrest pillar 123 of the embodiment) that is inserted into a seatback (for example, the seatback 103 of the embodiment). A plurality of notches are formed in the rear part of the headrest pillar along the extending direction of the headrest pillar, and the seat back has an engagement mechanism (for example, the pillar holder 124 of the embodiment) that engages with the notch. It is desirable to provide.
According to the present invention, a plurality of notches are formed along the extending direction of the headrest pillar at the rear portion of the headrest pillar, and the seat back is provided with the engagement mechanism that engages with the notch, and therefore engages with the engagement mechanism. The height of the headrest can be adjusted by appropriately changing the notch. Therefore, the fragile portion can also serve as the height adjustment cutout portion of the headrest, and the absorption of energy acting at the time of restraining the occupant of the airbag bag body can be realized with a simple configuration.

In the above vehicle seat, the airbag bag body is preferably attached to a rear portion of the frame portion.
According to the present invention, since the airbag bag body is attached to the rear portion of the frame portion, the airbag deployed forward is compared with the configuration in which the airbag bag body is attached to the front portion of the frame portion. Energy acting on the bag bag can be reliably transmitted to the frame portion and absorbed. Therefore, the passenger's head can be restrained more stably.

  According to the present invention, since the weak portion that can be deformed so as to displace the headrest toward the front is provided, the energy when the head of the occupant comes into contact with the airbag bag body passes through the airbag bag body and the headrest. Is transmitted to the frame portion. At this time, the fragile portion of the frame portion is deformed so as to displace the headrest toward the front, so that the energy transmitted to the frame portion can be absorbed. In this manner, energy acting on the airbag bag body can be transmitted to the frame portion and absorbed regardless of the seating position or physique of the occupant. Therefore, it can be set as the vehicle seat which can absorb effectively the energy which acts at the time of the passenger | crew restraint of an airbag bag body.

It is a side view of the vehicle seat of a 1st embodiment. It is the perspective view which looked at the A section of FIG. 1 from the left front. It is sectional drawing in the III-III line of FIG. It is a side view of the vehicle seat of a 1st embodiment in the state where the air bag body was developed. It is a front view of the vehicle seat of a 1st embodiment in the state where the air bag body was developed. It is sectional drawing in the surface orthogonal to the left-right direction in the center of the left-right direction of the vehicle seat of 1st Embodiment. It is sectional drawing in the surface orthogonal to the left-right direction in the center of the left-right direction of the vehicle seat of 1st Embodiment. It is a side view of the vehicle seat of 2nd Embodiment. It is sectional drawing in the surface orthogonal to the left-right direction in the center of the left-right direction of the vehicle seat of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a side view of a vehicle seat according to the first embodiment.
As shown in FIG. 1, a vehicle seat 1 (hereinafter simply referred to as “seat 1”) is connected to a seat cushion 2 that supports an occupant's buttocks, a rear end portion of the seat cushion 2, A seat back 3 that supports the back and a headrest 4 that supports the neck and head of the occupant are provided. In the following description, the front / rear, up / down / left / right directions are the same as the front / rear, up / down, left / right directions in the vehicle unless otherwise specified, and in the drawings, arrow UP indicates upward, arrow FR indicates front, and arrow LH indicates left. Yes. In the present embodiment, a driver's seat side seat will be described as an example of the seat 1, but the seat 1 may be a passenger seat side seat or a rear seat side seat. Further, in FIG. 1, illustration of a handle and the like is omitted.

  The seat cushion 2 includes a cushion frame 7, a cushion pad material (not shown), and a seat skin 26. The cushion frame 7 is formed in a rectangular frame shape. The cushion frame 7 includes a pair of plate members 6 disposed on both left and right sides and extending along the front-rear direction, and a pair of pipe members (not illustrated) disposed front and rear and extending along the left-right direction. ing. The cushion frame 7 is slidably attached to the vehicle body floor via a seat rail (not shown), for example. The cushion pad material is formed of, for example, urethane foam and is mounted on the upper surface of the cushion frame 7. The seat skin 26 is formed of, for example, synthetic fiber or leather, and covers the cushion frame 7 and the cushion pad material.

  The seat back 3 includes a seat frame 13 (corresponding to a “frame portion” in the claims), a seat pad material (not shown), and a seat skin 28. The seat frame 13 is formed in a rectangular frame shape. The seat frame 13 is disposed on both left and right side portions, and a pair of side frame portions 14 that extend along the up and down direction, an upper frame portion 15 that is disposed on the upper side and extends in the left and right direction, and a lower frame that is disposed on the lower side. And a lower frame portion (not shown) extending along the line. The lower end portion of the seat frame 13 is connected to the rear end portion of the cushion frame 7 of the seat cushion 2. Similarly to the cushion pad material of the seat cushion 2, the seat pad material is formed of, for example, urethane foam and is attached to the front surface of the seat frame 13. Similar to the seat skin 26 of the seat cushion 2, the seat skin 28 is formed of, for example, synthetic fiber or leather, and covers the seat frame 13 and the seat pad material. The front surface of the seat back 3 is inclined backward as it goes upward from the lower end.

  The upper end of the seat back 3 is a headrest 4. That is, in the seat 1 of the present embodiment, the seat back 3 and the headrest 4 are integrally provided, and the upper portion of the seat frame 13 (the upper portion of the side frame portion 14 and the upper frame portion 15) supports the headrest 4. doing.

FIG. 2 is a perspective view of portion A in FIG. 1 as viewed from the left front. FIG. 3 is a cross-sectional view taken along line III-III in FIG. In FIG. 2, the sheet skin 28 and a webbing 41 described later are indicated by a two-dot chain line. 2 and 3, the occupant is not shown.
As shown in FIG. 3, the headrest 4 incorporates an airbag device 30 that restrains the head of the occupant. The airbag device 30 includes an inflator 31 that generates high-pressure gas when an impact is input, and an airbag bag body 33 that is built in the headrest 4 and that is deployed so as to cover the occupant's head when gas is supplied from the inflator 31. It is equipped with. The airbag bag body 33 is accommodated in the retainer 37 together with the inflator 31 in a state of being folded in a predetermined shape.

  The retainer 37 is a plate-like member, and is curved and formed in a U shape that opens upward when viewed from the left-right direction. The retainer 37 is fastened and fixed to a front portion of the seat frame 13 (the upper frame portion 15 in the present embodiment) in the headrest 4 by a fastening member 16 such as a bolt.

  The inflator 31 is fastened and fixed to the front portion of the seat frame 13 (upper frame portion 15) in the headrest 4 by the fastening member 16 with the retainer 37 interposed therebetween. The inflator 31 is filled with a gas generating agent, and is configured to generate high-pressure gas when an impact greater than a predetermined magnitude is input to the vehicle. The inflator 31 includes a gas ejection hole (not shown). The high-pressure gas generated in the inflator 31 is injected into the airbag bag body 33 through the gas injection holes.

  The airbag bag body 33 is formed in a bag shape. A base end portion 33 b (opening portion) of the airbag bag body 33 is connected to the inflator 31. The airbag bag body 33 is provided in front of the inflator 31 attached to the upper frame portion 15. The airbag bag body 33 is expanded and expanded by the high-pressure gas injected from the gas injection hole of the inflator 31.

  As shown in FIG. 2, at the position facing the upper opening of the retainer 37 in the seat skin 28 of the headrest 4, a seam by a suture serving as the breaking boundary 29 is provided along the left-right direction. The breaking boundary portion 29 is broken by the deployment pressure of the airbag bag body 33 when the airbag bag body 33 of the airbag device 30 is deployed.

  As shown in FIG. 3, the inflator 31 and the airbag bag body 33 are covered with a webbing 41 together with the retainer 37. The force cloth 41 forms a deployment path of the airbag bag body 33 toward the fracture boundary portion 29 of the seat cover 28 when the airbag bag body 33 is deployed. The force cloth 41 wraps around the lower force cloth 41A that wraps around the lower part of the retainer 37 from between the seat frame 13 and the retainer 37, and the airbag bag body 33 that is folded from between the seat frame 13 and the retainer 37. An upper force cloth 41B. The front edge of the lower force cloth 41 </ b> A is sewn to the lower opening edge at the break boundary portion 29 of the seat cover 28. The front edge of the upper webbing 41B is stitched to the upper opening edge at the breaking boundary 29 of the seat skin 28. The lower force cloth 41 </ b> A and the upper force cloth 41 </ b> B apply tension to both edges of the break boundary portion 29 of the seat cover 28 when the airbag bag body 33 is deployed to promote breakage from the break boundary portion 29. It is a cloth member.

  A plurality of notches 18 are formed at the rear of each side frame 14. The cutout portion 18 is formed below the attachment location of the airbag device 30 when viewed from the left-right direction, that is, below the connecting portion between the side frame portion 14 and the upper frame portion 15 in this embodiment. The notch 18 is formed in a V shape that opens rearward when viewed from the left-right direction. In the present embodiment, the notches 18 are formed side by side at two locations along the extending direction of the side frame portion 14 in each side frame portion 14. The notch 18 is a fragile part 50 that locally lowers the strength of the side frame part 14.

FIG. 4 is an explanatory diagram of the seat according to the first embodiment, and is a side view of the seat in a state where the airbag bag body is deployed. FIG. 5 is an explanatory diagram of the seat according to the first embodiment, and is a front view of the seat in a state where the airbag bag body is deployed.
As shown in FIGS. 4 and 5, the airbag bag body 33 bulges forward from the broken fracture boundary portion 29 and expands so as to cover the head of the occupant. The deployed airbag body 33 covers the entire occupant's head. The lower end portion 33c of the front portion 33a of the deployed airbag bag body 33 is located in front of the chest of the occupant.

Hereinafter, the operation of the sheet 1 of the present embodiment will be described. For the reference numerals of the components of the seat 1 in the following description, refer to FIGS.
6 and 7 are explanatory views of the seat according to the first embodiment, and are cross-sectional views in a plane orthogonal to the left-right direction at the center in the left-right direction of the sheet.
When an impact greater than a predetermined magnitude is input to the vehicle, the inflator 31 of the airbag device 30 generates high-pressure gas. Then, the airbag bag body 33 of the airbag device 30 built in the headrest 4 is inflated inside the headrest 4. As shown in FIG. 6, the inflated airbag body 33 breaks the break boundary portion 29 of the seat cover 28, expands so as to cover the occupant's head, and restrains the occupant's head.

  When the occupant's head moves forward due to the inertia of the impact input to the vehicle, the occupant's head contacts the front portion 33a of the deployed airbag bag body 33. At this time, energy toward the front is transmitted to the seat frame 13 in the headrest 4 via the airbag bag body 33 and the headrest 4.

  Here, the seat 1 is provided on the seat frame 13 and has a weakened portion 50 (notched portion 18 in the present embodiment) that can be deformed so as to displace the headrest 4 forward when the passenger is restrained by the airbag bag body 33. I have. For this reason, as shown in FIG. 7, when forward energy is transmitted to the seat frame 13, the headrest 4 is displaced forward and the fragile portion 50 is deformed. As a result, the energy acting on the seat frame 13 is buffered, and the energy acting when the airbag bag 33 is restrained by the passenger is absorbed.

  As described above, the seat 1 of the present embodiment is deployed so as to cover at least the head of the occupant by being supplied with the headrest 4, the seat frame 13 that supports at least the headrest 4, and the headrest 4. An airbag bag body 33, and a fragile portion 50 that is provided on the seat frame 13 and is deformable so as to displace the headrest 4 toward the front when the passenger is restrained by the airbag bag body 33.

  According to this structure, since the weak part 50 which can deform | transform so that the headrest 4 may be displaced toward the front is provided, the energy at the time of a passenger | crew's head contacting the airbag bag body 33 is the airbag bag body 33. And transmitted to the seat frame 13 via the headrest 4. At this time, energy transmitted to the seat frame 13 can be absorbed by deforming the fragile portion 50 of the seat frame 13 so as to change the headrest 4 toward the front. In this manner, energy acting on the airbag bag body 33 can be transmitted to the seat frame 13 and absorbed regardless of the seating position or physique of the occupant. Therefore, it can be set as the sheet | seat 1 which can absorb the energy which acts at the time of passenger | crew restraint of the airbag bag body 33 effectively.

  Further, the fragile portion 50 is a cutout portion 18 provided at the rear portion of the seat frame 13 (side frame portion 14). According to this configuration, the strength of the seat frame 13 can be locally reduced by the cutout portion 18, so that the fragile portion 50 can be provided with a simple configuration. In addition, since the notch 18 is provided in the rear part of the seat frame 13, when the airbag bag 33 restrains the head of the occupant and the forward energy acts on the headrest 4, the seat frame The portion corresponding to the 13 cutouts 18 is deformed, and the headrest 4 can be easily displaced forward. Therefore, it is possible to provide the weakened portion 50 that can easily displace the headrest 4 toward the front.

[Second Embodiment]
FIG. 8 is a side view of the seat according to the second embodiment.
In the first embodiment shown in FIG. 1, the headrest 4 is provided integrally with the seat back 3. On the other hand, in the second embodiment shown in FIG. 8, the headrest 104 is different from the first embodiment in that the headrest 104 is provided separately from the seat back 103. In addition, about the structure similar to 1st Embodiment shown in FIGS. 1-5, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

As shown in FIG. 8, the vehicle seat 101 (hereinafter simply referred to as “seat 101”) includes a seat back 103 and a headrest 104.
The headrest 104 includes a headrest pad material and a headrest skin 121 that covers the headrest pad material. The headrest pad material is formed of, for example, urethane foam. The headrest skin 121 is made of, for example, synthetic fiber or leather.

  A headrest pillar 123 (corresponding to a “frame portion” in the claims) that supports the headrest 104 is embedded in the headrest 104. The headrest pillar 123 is a rod-like member having a circular cross-sectional view formed of, for example, a metal material. The headrest pillar 123 is formed in an inverted U shape when viewed from the front by left and right side parts 123a arranged at intervals in the left and right direction and a connecting part connecting the upper ends of the left and right side parts 123a. The left and right side portions 123a of the headrest pillar 123 project straightly downward from the headrest 104 and are inserted into the upper portion of the seat back 103.

  A plurality of notches 118 are formed in the rear part of the left and right side parts 123 a of the headrest pillar 123. The notch 118 is formed in a V shape that opens rearward when viewed from the left-right direction. The plurality of notches 118 are formed at substantially equal intervals along the extending direction of the left and right side portions 123 a of the headrest pillar 123. The notch 118 is a fragile portion 150 that can be deformed so as to displace the headrest 104 forward when the occupant is restrained by the airbag body 33.

  Further, the airbag device 30 is built in the headrest 104. The airbag device 30 is accommodated in a retainer 37 that is fastened and fixed to the rear portions of the left and right side portions 123 a of the pair of headrest pillars 123. The retainer 37 is fixed above the position where the notch 118 is formed in the headrest pillar 123. The inflator 31 is fastened and fixed to the rear portion of the headrest pillar 123 by the fastening member 16 with the retainer 37 interposed therebetween. A base end portion (opening portion) of the airbag bag body 33 is connected to the inflator 31. The airbag bag body 33 is attached to the rear portion of the headrest pillar 123 via the inflator 31.

  At the position facing the upper opening of the retainer 37 in the headrest skin 121, a seam by a suture that becomes the breaking boundary 122 is provided so as to extend in the left-right direction. The breaking boundary portion 122 is broken by the deployment pressure of the airbag bag body 33 when the airbag bag body 33 of the airbag device 30 is deployed, similarly to the breaking boundary portion 29 in the first embodiment.

  The seat back 103 includes a seat frame 113, a seat pad material (not shown), and a seat skin 28. The seat frame 113 is formed in a rectangular frame shape. The seat frame 113 is disposed on both left and right side portions, and a pair of side frame portions 114 that extend along the vertical direction, an upper frame portion 115 that is disposed on the upper side and extends in the left-right direction, and a lower frame that is disposed on the lower side. And a lower frame portion (not shown) that extends along the rectangular shape. Similarly to the headrest pad material of the headrest 104, the seatpad material is formed of, for example, urethane foam and is mounted on the front surface of the seat frame 113.

  A pair of pillar holders 124 (corresponding to “engagement mechanism” in the claims) through which the left and right side portions 123a of the pair of headrest pillars 123 are inserted are arranged at the upper end of the seat back 103 side by side. Yes. The pillar holder 124 is formed in a cylindrical shape from a resin material, for example. The pillar holder 124 supports the headrest pillar 123 so as to be movable along the vertical direction, and detachably engages with one of the plurality of notches 118 formed in each headrest pillar 123. Each pillar holder 124 is fixed to the upper frame portion 115 of the seat frame 113. Thereby, the headrest pillar 123 is held by the seat frame 113.

Hereinafter, the operation of the sheet 101 of the present embodiment will be described. Refer to FIG. 8 for the reference numerals of the components of the sheet 101 in the following description.
FIG. 9 is an explanatory diagram of the seat according to the second embodiment, and is a cross-sectional view taken along a plane perpendicular to the left-right direction at the center of the seat in the left-right direction.
When an impact of a predetermined magnitude or larger is input to the vehicle, the airbag bag body 33 that is inflated and deployed restrains the head of the occupant, similarly to the seat 1 in the first embodiment. When the head of the occupant restrained by the airbag bag body 33 moves forward due to the inertia of the impact input to the vehicle, the headrest pillar 123 that supports the headrest 104 is interposed between the airbag bag body 33 and the headrest 104. Forward energy is transmitted.

  The headrest pillar 123 is provided with a fragile portion 150 (notch portion 118) that can be deformed so as to displace the headrest 4 forward when the occupant is restrained by the airbag bag body 33. For this reason, as shown in FIG. 9, when forward energy is transmitted to the headrest pillar 123, the headrest 104 is displaced forward and the fragile portion 150 is deformed. Thereby, the energy which acts on the headrest pillar 123 is buffered, and the energy which acts when the occupant restraint of the airbag bag body 33 is absorbed.

  As described above, even when the headrest 104 is provided separately from the seat back 103, by providing the headrest pillar 123 with the fragile portion 150 (notch portion 118), energy acting on the airbag bag body 33 can be obtained. It can be transmitted to the headrest pillar 123 and absorbed. Therefore, it is possible to obtain the sheet 101 that can effectively absorb the energy that acts when the airbag 33 is restrained.

  Further, a plurality of notches 118 are formed in the rear part of the headrest pillar 123 along the extending direction of the headrest pillar 123, and the seat back 103 includes the pillar holder 124 that engages with the notch 118. Therefore, the notch that engages with the pillar holder 124 is provided. By appropriately changing the portion 118, the height of the headrest 104 can be adjusted. Therefore, the fragile portion 150 can also serve as the height adjustment notch 118 of the headrest 104, and the absorption of energy acting when the airbag bag 33 is restrained by the occupant can be realized with a simple configuration.

  Further, since the airbag bag body 33 is attached to the rear portion of the headrest pillar 123, the airbag bag 33 is expanded toward the front as compared with the configuration in which the airbag bag body 33 is attached to the front portion of the headrest pillar 123. The energy acting on the bag bag body 33 can be reliably transmitted to the headrest pillar 123 and absorbed. Therefore, the passenger's head can be restrained more stably.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in each of the embodiments described above, the notches 18 and 118 are formed in a V shape, but the present invention is not limited thereto, and may be formed in a U shape or the like, for example.

  Moreover, in each said embodiment, although the weak parts 50 and 150 were the notches 18 and 118, it is not limited to this, The weak part should just have the intensity | strength locally reduced. For example, the strength may be reduced by locally forming a frame portion (seat frame or headrest pillar) to form a weak portion.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1,101 Vehicle seat 4,104 Headrest 13 Seat frame (frame part)
18, 118 Notch 33 Airbag body 50, 150 Weak part 103 Seat back 123 Headrest pillar 124 Pillar holder (engaging mechanism)

Claims (4)

Headrest,
A frame that supports at least the headrest;
An airbag bag body that is built in the headrest and is deployed so as to cover at least a passenger's head by supplying gas;
A fragile portion that is provided on the frame portion and is deformable so as to displace the headrest forward when the occupant is restrained by the airbag bag body;
A vehicle seat comprising:   The vehicle seat according to claim 1, wherein the fragile portion is a cutout portion provided at a rear portion of the frame portion. The frame portion extends from the headrest and is a headrest pillar inserted into a seat back,
A plurality of the notches are formed along the extending direction of the headrest pillar at the rear of the headrest pillar,
The vehicle seat according to claim 2, wherein the seat back includes an engagement mechanism that engages with the notch.   The vehicle seat according to any one of claims 1 to 3, wherein the airbag bag body is attached to a rear portion of the frame portion.

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