阅读说明：本技术 气囊装置、气囊系统 (Airbag device and airbag system ) 是由 佐宗高 伊藤浩之 清水贵之 于 2020-02-13 设计创作，主要内容包括：提供能够缓和由在碰撞时膨胀了的袋体施加于乘员的冲击的气囊装置及气囊系统。气囊装置具备：充气机(21),其在冲击输入时产生气体；以及袋体(22),其接受来自充气机(21)的气体的供给而从车辆用座椅(3)的座椅靠背(32)膨胀展开,袋体(22)具备：一对前方延伸设置部(24),它们从座椅靠背(32)的宽度方向两侧朝向车辆前方延伸；以及前部气囊(27),其与前方延伸设置部(24)连续设置,且向就座于车辆用座椅(3)的乘员(100)的车辆前方侧展开并抵接于乘员(100)的躯体(101)的上部(102)。(Provided are an airbag device and an airbag system which can alleviate the impact applied to an occupant by a bag body that has expanded during a collision. The airbag device includes: an inflator (21) that generates gas when an impact is input; and a bag body (22) that is inflated and expanded from a seat back (32) of the vehicle seat (3) upon receiving a supply of gas from the inflator (21), wherein the bag body (22) is provided with: a pair of forward extension portions (24) extending from both sides in the width direction of the seat back (32) toward the front of the vehicle; and a front airbag (27) that is provided continuously with the front extension portion (24), that is deployed toward the vehicle front side of an occupant (100) seated in the vehicle seat (3), and that abuts against an upper portion (102) of a trunk (101) of the occupant (100).)

1. An airbag device, wherein,

the airbag device includes:

an inflator that generates gas upon impact input; and

a bag body that is inflated and expanded from a seat back of a vehicle seat upon receiving a supply of gas from the inflator,

the bag body is provided with:

a pair of front extension portions extending from both sides in the width direction of the seat back toward the front of the vehicle; and

a front airbag that is provided continuously with the front extension portion, that is deployed toward the front side of an occupant seated in the vehicle seat, and that abuts against an upper portion of a trunk of the occupant,

the front airbag includes a front lower bag portion that does not abut against a lower portion of the body of the occupant below an upper portion thereof or that abuts against the lower portion less strongly than the upper portion thereof.

2. The airbag device according to claim 1,

the pair of forward extending portions includes:

a pair of side airbags that are deployed on both sides of the body of the occupant in the width direction, that abut against side surfaces of the body, and that are connected to the front airbag; and

and a pair of upper airbags that are deployed above the body of the occupant and that abut against upper surfaces of the shoulders of the occupant.

3. The airbag device according to claim 2,

the bag body is configured to inflate and deploy the side airbag, the upper airbag, and the front airbag in this order when the bag body receives a supply of gas from the inflator.

4. The airbag device according to any one of claims 1 to 3,

a non-inflatable portion is provided in a part of the front airbag.

5. The airbag device according to any one of claims 1 to 4,

the thickness of the pair of front extension portions in the width direction of the vehicle in the inflated and expanded state of the front extension portion provided on the door side of the vehicle is formed to be larger than the thickness of the pair of front extension portions in the width direction of the vehicle in the inflated and expanded state of the front extension portion on the opposite side of the door side of the vehicle.

6. The airbag device according to claim 1,

the pair of forward extending portions are respectively deployed on both sides in the width direction of the vehicle seat with the head of the occupant interposed therebetween, and are along the side surfaces and the front surface of the head.

7. An air bag system in which, in a preferred embodiment,

the airbag system includes:

the airbag device of any one of claims 1 to 6; and

a second airbag device disposed in front of the occupant,

the second airbag device includes:

a second inflator that generates gas upon impact input; and

a second bag body which is inflated and expanded by the supply of gas from the second inflator,

the front airbag of the bag body is inflated and deployed between the second bag body and the body of the occupant.

Technical Field

The present invention relates to an airbag device and an airbag system.

Background

Conventionally, there is known an airbag device which is built in a vehicle seat and which deploys a bag body so as to cover an upper body of an occupant when an impact is input to a vehicle to restrain the occupant.

For example, japanese laid-open patent publication No. 2014-141159 discloses a side airbag provided at a vehicle width direction outer side portion of a seat back of a vehicle seat. The side airbag includes: a front side bag portion that restrains a chest portion and a front portion of an abdomen of a seated occupant; a rear side bag portion provided with an inflator for restraining a rear portion of a shoulder, a chest and an abdomen of a seated occupant; and a lower bag portion that restrains a waist portion of the seated occupant. In the side airbag having such a structure, the rear side bag portion provided with the inflator is inflated and deployed at a higher pressure earlier than the front side bag portion. Thus, the shoulder part and the rear part of the chest and the abdomen, which are relatively highly resistant to load, are restrained earlier by the rear side bag part than the front part of the chest and the abdomen, and the load received by the front part of the chest and the abdomen, which are relatively less resistant to load, from the front side bag part is reduced.

Disclosure of Invention

As the airbag device, there are a steering wheel provided in front of a driver seat and an airbag device having a bag body built in a console panel in front of a sub-driver seat. Such an airbag device receives the upper limbs of the occupant by a bag body that is expanded and expanded from a steering wheel or a console panel at the time of a vehicle collision. At this time, the body of the occupant who is restrained by the seat belt at the vehicle seat is caused to swing forward the head, shoulder, and chest around the waist and to collide with the bag body expanded and expanded from the steering wheel and the sub-dash panel. Therefore, it is desirable to alleviate the impact of the occupant when colliding with the bag body.

An object of an aspect of the present invention is to provide an airbag device and an airbag system that can alleviate an impact applied to an occupant by a bag body that has expanded at the time of a collision.

(1) An airbag device according to an aspect of the present invention includes: an inflator that generates gas upon impact input; and a bag body that is inflated and expanded from a seat back of a vehicle seat upon receiving supply of gas from the inflator, the bag body including: a pair of front extension portions extending from both sides in the width direction of the seat back toward the front of the vehicle; and a front airbag that is provided continuously with the front extension portion, that is deployed toward the front side of an occupant seated in the vehicle seat, and that abuts against an upper portion of a body of the occupant, wherein the front airbag includes a front lower bag portion that abuts against a lower portion of the body of the occupant below the upper portion, or does not abut against the lower portion, weaker than the abutment against the upper portion.

(2) In the airbag device according to the aspect (1), the pair of forward extending portions may include: a pair of side airbags that are deployed on both sides of the body of the occupant in the width direction, that abut against side surfaces of the body, and that are connected to the front airbag; and a pair of upper airbags that are deployed above the trunk of the occupant and that abut against upper surfaces of the shoulders of the occupant.

(3) In the airbag device according to the aspect (2), the bag body may be configured to inflate and deploy the side airbag, the upper airbag, and the front airbag in this order when the bag body receives the supply of gas from the inflator.

(4) In the airbag device according to any one of the above (1) to (3), a non-inflating portion may be provided in a part of the front airbag.

(5) In the airbag device according to any one of the above (1) to (4), a thickness of the pair of front extension portions in a width direction of the vehicle in an inflated and expanded state of the front extension portion provided on a door side of the vehicle may be formed to be larger than a thickness of the pair of front extension portions in the width direction of the vehicle in an inflated and expanded state of the front extension portion on an opposite side to the door side of the vehicle.

(6) In the airbag device pertaining to the above-described aspect (1), the pair of forward extending portions may be respectively deployed to both sides in the width direction of the vehicle seat with the head of the occupant interposed therebetween, and may be along a side surface and a front surface of the head.

(7) An airbag system according to another aspect of the present invention includes: the airbag device according to any one of the above (1) to (6); and a second airbag device provided in front of the occupant, the second airbag device including: a second inflator that generates gas upon impact input; and a second bag body that is inflated and expanded by receiving a gas supplied from the second inflator, wherein the front airbag of the bag body is inflated and expanded between the second bag body and the body of the occupant.

According to the aspect (1) described above, the front airbag, which is provided continuously with the pair of front extension portions extending from both sides in the width direction of the seatback toward the vehicle front side, deploys toward the vehicle front side of the occupant seated in the vehicle seat. This can suppress the amount of movement of the body of the occupant toward the front of the vehicle.

The front airbag is in contact with an upper portion of the front surface of the body of the occupant. The upper part of the body of the occupant, for example, the clavicle and several ribs, for example, the part from the top has higher resistance to the load applied from the front than the lower part. The front bag abuts on the upper portion of the front body surface having high resistance to the load, and the front lower bag portion weakly abuts or the front bag does not abut on the lower portion of the front body surface having low resistance to the load. This makes it possible to alleviate the impact received by the occupant even if the body of the occupant is displaced so as to swing forward during a collision and collides with the bag body.

According to the aspect (2) described above, the front extension portion is provided with the side airbag and the upper airbag, and thus can cover the upper portion and the shoulder portion of the side portion of the trunk of the occupant, and can alleviate the impact received by the occupant.

According to the aspect (3), the bag body is inflated and expanded in the order of the side airbag, the upper airbag, and the front airbag. As a result, the side airbag is inflated and deployed first, and displacement of the body of the occupant to the lateral side in the vehicle width direction and the diagonally forward side can be suppressed, and displacement of the body of the occupant toward the vehicle front side can be guided. Subsequently, the upper bag inflates and deploys, thereby suppressing upward displacement of the body of the occupant. Thereafter, the front airbag inflates and deploys, whereby displacement of the upper portion of the body of the occupant toward the vehicle front side can be suppressed.

According to the aspect (4), the non-inflating portion is provided at a part of the front airbag, whereby the volume expanded and deployed by the gas in the bag body can be suppressed. This enables the bag body to be rapidly inflated and expanded. Further, the front airbag can have a curved surface formed on the surface of the portion of the non-inflatable portion that abuts the upper portion of the trunk of the occupant, and can disperse the load applied to the trunk of the occupant.

According to the means of the above (5), the thickness in the vehicle width direction in the inflated and expanded state of the front extension portion provided on the door side is formed to be larger than the thickness in the vehicle width direction in the inflated and expanded state of the front extension portion on the opposite side. Thus, the front extension portion is interposed between the side surface of the trunk of the occupant and the door, and the cushioning property in the state where the front extension portion on the door side is inflated and expanded can be improved. Further, when the side surface of the trunk of the occupant abuts against the forward extending portion, the forward extending portion is also supported by the reaction force from the door. This allows the occupant to be received more reliably at the door-side forward extension portion.

According to the aspect (6) described above, the pair of forward extending portions are along the side surfaces and the front surface of the head of the occupant, whereby the amount of movement of the head of the occupant toward the front of the vehicle can be suppressed. This can prevent the head of the occupant from coming into contact with a member or the like provided in front of the vehicle.

According to the aspect (7), the bag body having the front airbag that abuts against the upper portion of the front surface of the body of the occupant is inflated and expanded between the second bag body inflated and expanded in front of the occupant and the occupant. Thus, the body and the head of the occupant can be received by the bag body and the second bag body and can be displaced so as to swing forward about the waist portion restrained by the seatbelt, and the impact applied to the occupant can be suppressed.

Drawings

Fig. 1 is a side view showing a part of a vehicle on which an airbag device and an airbag system according to a first embodiment of the present invention are mounted.

Fig. 2 is a perspective view showing a vehicle seat provided with the airbag device.

Fig. 3 is a view showing a state in which the airbag device is deployed, and is a perspective view of a vehicle seat on which the airbag device of the embodiment is mounted.

Fig. 4 is a diagram showing a state in which the airbag device is deployed, and is a diagram of a vehicle seat mounted with the airbag device of the embodiment as viewed from the front of the vehicle.

Fig. 5 is a perspective view showing a state in which the airbag device of the second embodiment of the present invention is deployed in a vehicle seat in which the airbag device of the second embodiment of the present invention is mounted.

Fig. 6 is a side view showing a state in which the airbag device of the second embodiment is deployed in a vehicle seat in which the airbag device of the second embodiment is mounted.

Detailed Description

Hereinafter, embodiments of the present invention will be described based on the drawings. In the drawings used below, arrow FR indicates the front of the vehicle, arrow UP indicates the upper side of the vehicle, and arrow LH indicates the left side of the vehicle.

[ first embodiment ]

Fig. 1 is a side view showing a part of a vehicle mounted with an airbag device and an airbag system to which an embodiment of the present invention is applied.

As shown in fig. 1, a vehicle 1 includes an airbag system 2A in a vehicle compartment. The airbag system 2A includes a main airbag device (second airbag device) 10 provided in the steering wheel or the sub-dash panel 4, and a seat airbag device (airbag device) 20 provided in the vehicle seat 3.

The steering wheel or the console 4 is provided on the front side of the vehicle 1 (vehicle front) with respect to the vehicle seat 3. The main airbag device 10 includes an inflator (second inflator) 11 and a bag body (second bag body) 12.

The inflator 11 generates high-pressure gas when an impact is input to the vehicle. The inflator 11 is built in the steering wheel or the sub dash panel 4.

The bag body 12 is housed in a folded or rolled state inside the steering wheel or the console panel 4, and is inflated and expanded from the steering wheel or the console panel 4 toward the rear side of the vehicle 1 (vehicle rear side) upon receiving the supply of gas from the inflator 11.

Fig. 2 is a perspective view showing a vehicle seat provided with the airbag device.

As shown in fig. 2, the vehicle seat 3 on which the seat airbag device 20 is mounted is, for example, a seat of a driver seat, a seat of a passenger seat, or the like. The vehicle seat 3 includes: a seat cushion 31 that supports the buttocks of the occupant; and a seat back 32 coupled to a rear end portion of the seat cushion 31 for supporting an upper body (trunk, neck, and head) of the occupant.

The seat cushion 31 includes a frame forming a skeleton of the seat cushion 31, a cushion material formed of, for example, urethane foam and attached to the frame, and a cover (not shown) formed of, for example, synthetic fiber, leather, and the like and covering the frame and the cushion material. The seat back 32 is connected to a rear end portion of the seat cushion 31 so as to be capable of tilting movement. The seat back 32 includes: a seat back main body 33 that supports, for example, the waist and back of an occupant; and a headrest 34 attached to an upper end portion of the seat back main body 33 for supporting, for example, the head of an occupant. The seat back 32 is formed of a frame, a cushion material, and a cover, similarly to the seat cushion 31. The seat back main body 33 and the headrest 34 may also be integrally formed.

The seat airbag device 20 is built in the seat back 32. In the present embodiment, the seat airbag device 20 is incorporated in the seat back main body 33. The seat airbag device 20 restrains an upper portion of the upper body of the occupant during operation. The seat airbag device 20 includes an inflator 21 and a pair of bag members 22.

The inflator 21 generates high-pressure gas when an impact is input to the vehicle. The inflator 21 is mounted to a frame forming the seat back 32.

Fig. 3 is a diagram showing a state in which the airbag device of the embodiment is deployed, and is a perspective view of a vehicle seat on which the airbag device of the embodiment is mounted. Fig. 4 is a diagram showing a state in which the airbag device of the embodiment is deployed, and is a diagram of a vehicle seat on which the airbag device of the embodiment is mounted, as viewed from the front of the vehicle.

As shown in fig. 1, 3, and 4, the pair of bag members 22 are housed in a folded or rolled state inside the seat back 32, for example, and are inflated and expanded from the seat back 32 by receiving the supply of gas from the inflator 21. The pair of pockets 22 are attached to a frame forming the seat back 32. Each bag body 22 is formed in a bag shape from 1 piece of base fabric or a plurality of pieces of base fabric sewn together. In the following description of the bag body 22, the state in which the bag body 22 is completely unfolded (the state shown in fig. 1, 3, and 4) will be described unless otherwise specified.

The pair of bag members 22 are disposed in a range from the side of the seatback main body 33 to the front of the trunk of the occupant. Each bag body 22 is unfolded by breaking the sewn seams of the cover from the side surface 33s of the seat back main body 33.

The pair of bag bodies 22 are provided with a front extension portion 24 and a front airbag 27, respectively.

The forward extension portion 24 extends from the lateral side of the seat back 32 toward the front of the vehicle 1. In the first embodiment, the front extension portion 24 includes the side airbag 25 and the upper airbag 26.

The side airbag 25 extends forward from the lateral side of the seatback 32 through the lateral side (side surface) of the trunk 101 of the occupant 100. The side airbag 25 is deployed in a tubular shape extending in the front-rear direction, and covers the shoulder 104 and the upper portion of the arm of the occupant 100 from the side.

The upper bag 26 is provided via a connecting portion 28 that continuously extends upward from the rear end portion of the side bag 25. The upper bag 26 extends forward from the connecting portion 28, and is deployed above the trunk 101 of the occupant 100 so as to cover the upper surface of the shoulder portion 104.

As shown in fig. 4, in the pair of bag members 22, a thickness T1 in the left-right direction (width direction of the vehicle 1) of the side airbag 25A provided on the door 5 side of the vehicle 1 is formed to be larger than a thickness T2 of the side airbag 25B on the side opposite to the door 5 side.

As shown in fig. 1, 3, and 4, the front bag 27 is provided continuously with the front extension portion 24. In the first embodiment, the front bag 27 is provided continuously with the front end portion of the side bag 25 and the front end portion of the upper bag 26. The front airbag 27 is deployed toward the front of the occupant 100 seated in the vehicle seat 3, and is in contact with only the upper portion 102 of the front surface of the trunk 101 of the occupant 100. Specifically, the front airbag 27 is provided so as to abut a plurality of the clavicles and the ribs of the trunk 101 from the top (for example, from the top to the 2 nd). The lower end of the front airbag 27 ends at the height of the 2 nd from the top of the rib, for example, and does not abut on the 3 rd and subsequent parts of the rib (the lower portion 107 on the front surface of the trunk 101). This gives a relatively strong or weak occupant restraining force to the upper and lower sides of the front airbag 27.

As shown by the two-dot chain line in fig. 1, 3, and 4, the front airbag 27 may include a front lower airbag 27b that makes weaker contact with the 3 rd and subsequent parts (lower parts 107) of the ribs than with the upper parts 102. The front lower bag 27b has, for example, holes, notches, weakened portions, and the like to weaken the abutting force. This gives a relatively strong or weak occupant restraining force to the upper and lower sides of the front airbag 27.

As shown in fig. 1, such a front airbag 27 is provided to inflate and deploy between a bag body 12 provided in a steering wheel or a dash panel 4 and a body 101 of an occupant 100.

A belt-like tether (tether)50 is provided inside the bag body 22 so that the side airbag 25, the upper airbag 26, and the front airbag 27 are deployed along the upper portion 102 of the front surface of the trunk 101 of the occupant 100 and the upper portion of the side surface of the trunk 101.

The side airbag 25 and the front airbag 27 are formed with non-inflating portions 29A and 29B that are formed by sewing together the facing base fabrics of the respective bag bodies and do not inflate when deployed. The side airbag 25 is inflated while forming a curved surface 25w (see fig. 4) that abuts on the upper portion of the arm portion of the occupant 100 by forming the non-inflating portion 29A. The front airbag 27 is inflated while forming a curved surface 27w (see fig. 1) that abuts against the upper portion 102 of the front surface of the trunk 101 by forming the non-inflating portion 29B.

The bag body 22 is provided with a side airbag 25, an upper airbag 26, and a front airbag 27 continuously on the outer peripheral side of the non-inflating portions 29A, 29B.

The inflator 21 supplies gas into the bag body 22 near the rear end of the side airbag 25.

The pair of bag members 22 are inflated and expanded in the order of the side airbag 25, the upper airbag 26, and the front airbag 27 when gas is supplied from the inflator 21.

The operations of the main airbag device 10 and the seat airbag device 20 will be described below.

When an impact is input to the vehicle, the inflator 11 of the main airbag device 10 and the inflators 21 of the seat airbag device 20 generate high-pressure gas, respectively. When gas is generated from the inflator 11, the bag body 12 of the main airbag device 10 is inflated and expanded by the supply of the gas.

When gas is generated from the inflator 21, the side airbag 25 is inflated and deployed first by the supply of the gas. When the side airbag 25 inflates and deploys to some extent, gas is supplied from the rear end portion of the side airbag 25 to the upper airbag 26 through the connecting portion 28, and the upper airbag 26 inflates and deploys.

Then, gas is supplied from the front end portion of the side bag 25 and the front end portion of the upper bag 26 to the front bag 27. Thereby, the front airbag 27 inflates and deploys in front of the upper portion 102 of the trunk 101 of the occupant 100. The deployed shape of the front airbag 27 is formed in a shape that covers the upper portion 102 of the trunk 101 of the occupant 100 from the front by the tension of the tether 50, and retains the restraining force of the body of the occupant 100. The front airbag 27 is interposed between the upper portion 102 of the body 101 and the bag body 12 of the main airbag device 10 inflated and deployed from the steering wheel or the sub dash panel 4.

As described above, the operations of the main airbag device 10 and the seat airbag device 20 are completed.

As described above, in the above-described embodiment, the front airbag 27 is provided continuously with the pair of front extension portions 24 extending from both sides in the width direction of the seat back 32 toward the vehicle front, and the front airbag 27 is deployed toward the front side of the occupant 100 seated in the vehicle seat 3.

This can suppress the amount of movement of the trunk 101 of the occupant 100 toward the front of the vehicle. The front airbag 27 abuts on the upper portion 102 of the front surface of the trunk 101 of the occupant 100. The upper portion 102 of the trunk 101 of the passenger 100, for example, the clavicle or the several-up rib portions, has higher resistance to a load applied from the front than the lower portion. The front bag 27 abuts against the upper portion 102 of the front surface of the body 101 having high resistance to the load, and the front lower bag 27b weakly abuts against the lower portion 107 of the front surface of the body 101 having low resistance to the load or the front bag 27 does not abut against the lower portion. This can suppress the lower portion 107 of the trunk 101, which is lower than the upper portion 102 and has low resistance to a load applied from the front, from being applied with an impact. Therefore, even if body 101 of occupant 100 is displaced so as to swing forward at the time of collision and collides with bag 22, the impact received by occupant 100 can be alleviated.

The front extension portion 24 includes a side airbag 25 and an upper airbag 26. This covers the upper part 102 and the shoulder part 104 of the side part 103 of the trunk 101 of the occupant 100, and can reduce the impact applied to the occupant 100.

The bag body 22 is inflated and expanded in the order of the side bag 25, the upper bag 26, and the front bag 27. As a result, the side airbag 25 inflates and deploys first, and thereby displacement of the trunk 101 of the occupant 100 toward the lateral side in the left-right direction and obliquely forward can be suppressed, and displacement of the trunk 101 of the occupant 100 toward the front of the vehicle on which the main airbag device 10 is installed can be guided. Then, the upper bag 26 inflates and expands, thereby suppressing the upward displacement of the trunk 101 of the occupant 100. Thereafter, the front airbag 27 inflates and deploys, so that the upper portion 102 of the body 101 of the occupant 100 is easily and reliably received by the front airbag 27.

Further, a non-inflating portion 29B is provided in a part of the front airbag 27. This can suppress the volume of the bag 22 expanded and expanded by the gas. This enables the bag body 22 to be inflated and expanded quickly. In the front airbag 27, the curved surface 27w can be formed on the surface of the portion of the non-inflating portion 29B that abuts against the upper portion 102 of the trunk 101 of the occupant 100, and the load applied to the trunk 101 of the occupant 100 can be dispersed.

The side airbag 25A provided on the door 5 side is formed to have a larger thickness T1 in an inflated and expanded state than the side airbag 25B on the opposite side. Thus, the side airbag 25A is interposed between the side surface of the trunk 101 of the occupant 100 and the door 5, and the cushioning property in the state where the side airbag 25A on the door 5 side is inflated and expanded can be improved. When the side surface of the trunk 101 of the occupant 100 hits the side airbag 25A, the side airbag 25A is also supported by the reaction force from the door 5. This allows the passenger 100 to be more reliably received by the side airbag 25A on the door 5 side.

The bag body 22 having the front airbag 27 in contact with the upper portion 102 of the front surface of the body 101 of the occupant 100 is inflated and expanded between the bag body 12 inflated and expanded from the steering wheel or the dash panel 4 in front of the occupant 100 and the occupant 100. Accordingly, when the trunk 101 and the head 108 of the occupant 100 are displaced so as to swing forward about the waist portion restrained by the seatbelt, the body 22 and the bag 12 can receive the displacement, and the impact applied to the occupant 100 can be suppressed.

In the above embodiment, the seat airbag device 20 includes the side airbag 25 and the upper airbag 26 as the forward extending portion 24A, but only one of them may be provided.

In the above embodiment, a bag body (front lower bag 27b) having a lower tension than the front bag 27 may be provided below the front bag 27 of the seat bag device 20. By reducing the tension of the bag body provided below the front airbag 27, the impact on the portion of the body 101 of the occupant 100 having low resistance can be suppressed.

[ second embodiment ]

Next, an airbag device and an airbag system according to a second embodiment of the present invention will be described. An airbag device and an airbag system in a second embodiment to be described below are different in the structure of a bag body of a seat airbag device from the airbag device in the first embodiment. In the following description, the same reference numerals are used in the drawings to denote the same components as those of the first embodiment, and the description thereof may be omitted.

Fig. 5 is a perspective view showing a state in which an airbag device according to a second embodiment of the present invention is deployed in a vehicle seat in which the airbag device is mounted. Fig. 6 is a side view showing a state in which the airbag device according to the second embodiment of the present invention is deployed in a vehicle seat in which the airbag device is mounted.

As shown in fig. 5 and 6, the vehicle 1 includes an airbag system 2B indoors.

The airbag system 2B includes a main airbag device (not shown) provided in the steering wheel or the sub-dash panel 4, and a seat airbag device (airbag device) 40 provided in the vehicle seat 3.

The seat airbag device 40 is built in the seat back 32. In the present embodiment, the seat airbag device 40 is incorporated in the upper portion of the rear surface of the seatback main body 33 or the headrest 34. The seat airbag device 40 restrains the upper portion of the upper body of the occupant in operation. The seat airbag device 40 includes an inflator 41 and a bag 42.

The inflator 41 generates high-pressure gas when an impact is input to the vehicle. The inflator 41 is mounted to a frame forming the seat back 32.

The bag body 42 is housed in a folded or rolled state inside the seat back 32, and is inflated and expanded from the seat back 32 by receiving the supply of gas from the inflator 41. The bag body 42 is attached to a frame forming the seat back 32. The bag body 42 is formed in a bag shape from 1 piece of base fabric or a plurality of pieces of base fabric sewn to each other. In the following description of the bag member 42, the state in which the bag member 42 is completely unfolded will be described unless otherwise specified.

The bag body 42 is unfolded by breaking the sewn seams of the cover from the rear surface 33b of the seat back main body 33 or the headrest 34. The bag body 42 includes a rear airbag 43, a pair of front extension portions 44, and a pair of front airbags 45.

The rear airbag 43 stands upward from the rear surface 33b of the seatback main body 33 or the headrest 34. The rear airbag 43 stands up above the upper end of the headrest 34. The rear airbag 43 is formed to have a width dimension in the left-right direction larger than that of the headrest 34.

The pair of front extension portions 44 extend from both sides of the rear airbag 43 in the width direction toward the front of the vehicle 1. The pair of forward extending portions 44 are provided so that the distance therebetween in the left-right direction gradually decreases toward the front. That is, each of the front extension portions 44 extends diagonally forward so as to approach the widthwise center side of the seatback body 33 from the widthwise side of the rear airbag 43. Thus, the bag 42 has a substantially triangular shape in plan view. The distal ends 44f of the pair of forward extending portions 44 may be connected to each other.

The pair of forward extending portions 44 are deployed so as to cover the side surfaces 105 and the front surface 106 of the head 108 of the occupant 100. The lower end portion 44b of the forward extension portion 44 is deployed so as to cover the upper surface of the shoulder portion 104 of the trunk 101 of the occupant 100.

The pair of front airbags 45 are provided to extend downward from the front end portions 44f of the pair of forward extending portions 44. The front airbag 45 is formed continuously with the lower side of the front end portion 44f of the front extension portion 44. The front airbag 45 communicates with the front extension portion 44. The front airbag 45 is deployed toward the front of the occupant 100 seated in the vehicle seat 3, and is in contact with only the upper portion 102 of the front surface of the trunk 101 of the occupant 100. Specifically, the front airbag 45 is provided so as to abut a plurality of the clavicles and the ribs of the trunk 101 from the top (for example, from the top to the 2 nd). The lower portion of the front airbag 45 ends at the height of the 2 nd from the top of the rib, for example, and does not abut against the 3 rd and subsequent parts of the rib (the lower portion 107 of the front surface of the body 101). This imparts a relatively strong or weak occupant restraining force to the upper and lower sides of the front airbag 45.

As shown by the two-dot chain lines in fig. 5 and 6, the front airbag 45 may include a front lower bag portion 45b, and the front lower bag portion 45b may be in weaker contact with the 3 rd and subsequent portions (lower portions 107) of the ribs from the top than with the upper portions 102. The front lower bag portion 45b has, for example, holes, notches, weakened portions, and the like, and weakens the abutting force. This imparts a relatively strong or weak occupant restraining force to the upper and lower sides of the front airbag 45.

The front airbag 45 may be disposed to inflate and expand between the bag body 12 provided in the steering wheel or the dash panel 4 and the trunk 101 of the occupant 100, similarly to the configuration shown in fig. 1.

A band-shaped tether (not shown) is provided inside the bag body 42 to deploy the rear airbag 43, the front extension portion 44, and the front airbag 45 as described above.

The front extension portion 44 is formed with a non-inflatable portion 29C that stitches the facing base cloths of the bag body together and does not inflate when unfolded. The forward extending portion 44 forms the non-expanding portion 29C, and thus expands annularly so as to surround the non-expanding portion 29C.

The inflator 41 supplies gas into the bag body 42 in the rear airbag 43. The bag body 42 is provided to inflate and deploy the rear airbag 43, the front extension portion 44, and the front airbag 45 in this order when the inflator 41 receives a supply of gas.

The operations of the main airbag device 10 and the seat airbag device 40 will be described below.

When an impact is input to the vehicle, the inflator 41 of the seat airbag device 40 generates high-pressure gas. When gas is generated from the inflator 41, the front-most airbag 43 is inflated and deployed by the supply of the gas. When the rear airbag 43 inflates and deploys, gas is supplied to the pair of forward extending portions 44 from both sides in the width direction thereof, and the pair of forward extending portions 44 inflates and deploys.

Then, gas is supplied from the pair of forward extending portions 44 to the front airbag 45. Thereby, the front airbag 45 inflates and deploys forward of the upper portion 102 of the body 101 of the occupant 100.

In accordance with the above, the operation of the seat airbag device 40 is completed.

As described above, in the second embodiment, the front airbag 45 is provided continuously with the pair of front extension portions 44 extending from both sides in the width direction of the seat back 32 toward the vehicle front, and the front airbag 45 is deployed toward the front side of the occupant 100 seated in the vehicle seat 3. This can suppress the amount of movement of the trunk 101 of the occupant 100 toward the front of the vehicle. The front airbag 45 is in contact with the upper portion 102 of the front surface of the body 101 having high resistance to the load, and the front lower bag portion 45b is in weak contact with the lower portion 107 of the front surface of the body 101 having low resistance to the load or the front airbag 45 is not in contact with the lower portion. This can reduce the impact received by the occupant 100 even if the body 101 of the occupant 100 is displaced so as to swing forward and collides with the bag member 42 at the time of collision.

The pair of forward extending portions 44 are along the side surfaces 105 and the front surface 106 of the head 108 of the occupant 100. This can suppress the amount of movement of the head 108 of the occupant 100 toward the front of the vehicle. This can prevent the head 108 of the occupant 100 from coming into contact with a member or the like provided in front.

In the second embodiment, as in the first embodiment, the thickness of the front extension portion 44 provided on the door 5 side may be larger than the thickness of the front extension portion 44 on the opposite side.

The configuration of the above embodiment is an example of the present invention, and various modifications can be made without departing from the scope of the present invention.