CN114379500A - Occupant protection device for vehicle - Google Patents

Occupant protection device for vehicle Download PDF

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Publication number
CN114379500A
CN114379500A CN202110816413.7A CN202110816413A CN114379500A CN 114379500 A CN114379500 A CN 114379500A CN 202110816413 A CN202110816413 A CN 202110816413A CN 114379500 A CN114379500 A CN 114379500A
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CN
China
Prior art keywords
seat
width direction
chamber
vehicle
occupant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110816413.7A
Other languages
Chinese (zh)
Inventor
太田悠登
深渡濑修
河村和浩
荒井佑太
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of CN114379500A publication Critical patent/CN114379500A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/207—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in vehicle seats
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0134—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to imminent contact with an obstacle, e.g. using radar systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • B60R21/2165—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member characterised by a tear line for defining a deployment opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • B60R21/23138—Inflatable members characterised by their shape, construction or spatial configuration specially adapted for side protection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • B60R21/23138—Inflatable members characterised by their shape, construction or spatial configuration specially adapted for side protection
    • B60R2021/23146—Inflatable members characterised by their shape, construction or spatial configuration specially adapted for side protection seat mounted

Abstract

An occupant protection device for a vehicle, comprising: a lumbar chamber that is housed in a vertically extended state in a side portion on a vehicle width direction outer side of a seatback of a vehicle seat, that receives supply of gas from an inflator when a side collision is predicted or detected, and that inflates and deploys laterally on the vehicle width direction outer side with respect to a lumbar portion of an occupant; a head chamber that is housed in a state of extending from an upper end portion of the chamber lumbar chamber toward a seat width direction inner side along an upper end portion of the seat back, receives a supply of gas from the inflator when a side collision is predicted or detected, and inflates and deploys laterally on a vehicle width direction outer side with respect to a head of an occupant; a lower rupture scheduled portion that is provided at a side portion on an outer side in a vehicle width direction of the seat back, extends vertically, and ruptures a skin of the seat back by the inflation pressure of the waist portion; an upper side rupture predetermined portion that extends in a seat width direction at an upper portion of the seat back and ruptures a skin of the seat back by an inflation pressure of the head chamber.

Description

Occupant protection device for vehicle
Technical Field
The present invention relates to a vehicle occupant protection device.
Background
Japanese patent application laid-open No. 2011-105107 discloses a side airbag that inflates and deploys laterally of an occupant during a side collision. The side airbag disclosed in japanese patent application laid-open No. 2011-105107 includes: the vehicle seat includes a head protection inflatable portion (head chamber) for restraining a head of an occupant, a lumbar protection inflatable portion (lumbar chamber) for restraining a lumbar portion of the occupant, and an intermediate inflatable portion connecting the head protection inflatable portion and the lumbar protection inflatable portion.
Disclosure of Invention
In the side airbag described in the above-mentioned japanese patent application laid-open publication No. 2011-105107, since there is a gap between the head chamber and the head, it is difficult to secure an initial restraining force of the head at the time of a side collision. As a countermeasure, it is conceivable to inflate and deploy a part of the airbag between the shoulder belt and the vehicle seat, as in the technique described in japanese patent application laid-open No. 2001-502987. However, the above-mentioned japanese patent application laid-open No. 2001-502987 discloses no specific airbag storage position, rupture scheduled portion, and the like, and there is room for improvement from the viewpoint of stably inflating and deploying the side airbag between the shoulder belt and the vehicle seat.
In view of the above circumstances, an object of the present invention is to obtain a vehicular occupant protection apparatus capable of inflating and deploying a head chamber stably between a shoulder belt and a vehicular seat.
The vehicular occupant protection apparatus according to claim 1, comprising: a lumbar chamber that is housed in a vertically extending state in a vehicle width direction outer side portion of a seat back of a vehicle seat, that receives supply of gas from an inflator when a side collision is predicted or detected, and that inflates and deploys toward a vehicle width direction outer side with respect to a lumbar portion of an occupant; a head chamber that is housed in a state of extending from an upper end portion of the lumbar chamber toward a seat width direction inner side along an upper end portion of a seat back, receives supply of gas from the inflator when a side collision is predicted or detected, and inflates and deploys toward a vehicle width direction outer side with respect to a head of an occupant; a lower rupture scheduled portion that is provided at a side portion on a vehicle width direction outer side of the seat back, extends vertically, and ruptures a skin of the seat back by an inflation pressure of the lumbar chamber; and an upper side rupture scheduled portion that extends in a seat width direction to an upper portion of the seat back and ruptures a skin of the seat back by an inflation pressure of the head chamber.
In the vehicular occupant protection apparatus according to claim 1, the lumbar chamber is housed in a state of extending vertically in a side portion on the vehicle width direction outer side of the seat back. When a side collision is predicted or detected, the lumbar chamber receives gas from the inflator, and inflates and deploys laterally outward in the vehicle width direction with respect to the lumbar region of the occupant. The head chamber extends from the upper end of the lumbar chamber toward the seat width direction inner side along the upper end of the seat back. When a side collision is predicted or detected, the head chamber receives gas from the inflator, and inflates and deploys laterally outward in the vehicle width direction with respect to the head of the occupant. Thus, the side portions on the outer sides in the vehicle width direction with respect to the waist portion and the head portion of the occupant are covered with the waist chamber and the head chamber at the time of a side collision of the vehicle, and the occupant can be protected.
Here, the lower rupture scheduled portion is provided at a side portion on the vehicle width direction outer side of the seat back. The lower rupture reserve portion extends vertically, and ruptures the epidermis of the seat back by the inflation pressure of the lumbar chamber. Thus, when gas is supplied to the lumbar chamber, the skin of the side portion of the seat back is ruptured along the lower side rupture scheduled portion by the inflation pressure of the lumbar chamber. On the other hand, the upper rupture scheduled portion extends in the seat width direction to an upper portion of the seat back. The upper rupture portion ruptures the skin of the seat back by the inflation pressure of the head chamber. This enables the head chamber to be inflated and deployed from a position closer to the head of the occupant than the shoulder belt.
The vehicular occupant protection apparatus according to claim 2, in claim 1, a shoulder belt that is worn to extend obliquely from a shoulder portion on a vehicle width direction outer side of an occupant seated in the vehicular seat to a waist portion on a vehicle width direction inner side to restrain an upper body of the occupant to the seatback is provided, and the upper side rupture scheduled portion extends to a position overlapping with the shoulder belt in a worn state or to a seat width direction inner side than the shoulder belt, as viewed in a seat front-rear direction.
In the vehicular occupant protection apparatus according to claim 2, the head chamber can be inflated and deployed between the shoulder belt and the vehicular seat more reliably than in a structure in which the upper rupture scheduled portion extends only to the seat width direction outer side than the shoulder belt in a worn state, as viewed from the seat front-rear direction. The "wearing state of the shoulder belt" referred to herein is a wearing state of a three-point seat belt, and specifically refers to a state in which a tongue plate inserted in a webbing is attached to a buckle in a state in which a passenger of a standard body size is seated.
The vehicular occupant protection apparatus according to claim 3, in claim 1 or 2, the head chamber is provided inside an upper end portion of the seatback, extending along a rear portion of the upper frame that extends in the seat width direction.
In the vehicular occupant protection apparatus according to claim 3, since the rear portion of the upper frame does not require a cushion or the like for supporting the occupant, it is easy to secure the storage space of the head chamber. That is, by extending the head chamber along the rear portion of the upper frame, the head chamber can be housed without affecting the outer shape of the vehicle seat.
In the vehicular occupant protection apparatus according to claim 4, in claim 3, the upper scheduled rupturing portion is provided so as to wrap around from an upper end portion of the seatback to a seat rear side of the upper frame when viewed in plan.
In the vehicular occupant protection apparatus according to claim 4, since the upper scheduled breaking portion is provided so as to wrap around to the rear side of the upper frame in plan view, the upper scheduled breaking portion is less likely to come into contact with an occupant seated in the vehicular seat. This can suppress the upper rupture portion from being accidentally ruptured by contact with the occupant. In addition, the upper rupture portion can suppress a reduction in the appearance of the vehicle seat.
As described above, according to the vehicular occupant protection apparatus of the present invention, the head chamber can be inflated and deployed stably between the shoulder belt and the vehicular seat.
Drawings
Features, advantages and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like parts, and wherein:
fig. 1 is a front view of a vehicle seat to which a vehicle occupant protection device according to an embodiment is applied, showing a state in which a side airbag is inflated and deployed.
Fig. 2 is an enlarged side view of a vehicle seat to which the vehicle occupant protection device according to the embodiment is applied, showing a state in which a side airbag is inflated and deployed.
Fig. 3 is an enlarged front view of a seat back in the embodiment.
Fig. 4 is a perspective view of the vehicle seat in the embodiment viewed obliquely from the seat left side and from the seat upper side.
Fig. 5 is an enlarged plan view showing a seat back and a headrest in an enlarged manner in the embodiment.
Detailed Description
Next, a vehicle occupant protection device 10 according to an embodiment will be described with reference to the drawings. In the drawings, arrows FR, UP, and RH indicate the seat front side, the seat upper side, and the seat right side of the vehicle seat 14 on which the vehicle occupant protection device 10 is mounted, respectively. In the case of the description of the front-rear, left-right, and up-down directions, the front-rear direction of the seat, the left-right direction of the seat width direction, and the up-down direction of the seat are indicated unless otherwise specified.
(vehicle seat 14)
As shown in fig. 1, a vehicle seat 14 on which the vehicle occupant protection device 10 of the present embodiment is mounted is configured to include a seat cushion 16, a seat back 18, and a headrest 20. As shown in fig. 2, the side airbag device 12 is configured to include the side airbag 44 and the inflator 42 of the present embodiment. As an example, the vehicle seat 14 shown in fig. 1 and 2 is disposed in an operator's seat on the left side of the vehicle, and the front of the seat coincides with the front of the vehicle. Further, the left and right in the seat width direction are aligned with the left and right in the vehicle width direction.
In the vehicle seat 14 shown in fig. 1 and 2, a dummy P for a crash test is seated instead of an actual passenger. The Dummy P is, for example, AM50 (fifty percent of American adult males) from WorldSID (International Uniform Side Impact Dummy: World Side Impact Dummy). Hereinafter, for convenience of explanation, the dummy P will be referred to as an "occupant P".
The seat cushion 16 extends in the seat front-rear direction and the seat width direction, and is configured to be able to support the hip and thigh of the occupant P. The seat back 18 is rotatably connected to a rear end portion of the seat cushion 16, extends in the seat up-down direction, and is configured to support a back portion of the occupant P. The headrest 20 is provided at an upper end portion of the seat back 18 and configured to support the head H of the occupant P.
(seatbelt device 24)
As shown in fig. 1, the occupant P is restrained by the seatbelt apparatus 24 to the vehicle seat 14. The seat belt apparatus 24 is configured to include a webbing 26, a tongue plate 30, a buckle 32, and a retractor not shown in the drawings.
The tape 26 is formed in a long strip shape, and is provided with: a shoulder belt 26A that restrains the upper body of the occupant P to the seatback 18 in a worn state; and a lap belt 26B for restraining a lap L of the occupant. The shoulder belt 26A extends obliquely from the left shoulder S of the occupant P to the right waist L. And, the lower end portion of the shoulder belt 26A passes through the tongue plate 30.
The tongue plate 30 is inserted into the belt 26 and is configured to be detachable from a buckle 32 provided on the right side of the seat. Then, the tongue plate 30 is attached to the buckle 32, whereby the occupant P is restrained by the strap 26.
The webbing 26 extends from the tongue plate 30 to the seat left side, and a portion extending in the seat width direction constitutes a lap belt 26B. Therefore, the right side end portion of the lap belt 26B is connected to the lower end portion of the shoulder belt 26A. In addition, the left side end portion of the shoulder belt 26B is fixed to a belt anchor 34, and the belt anchor 34 is disposed on the floor 40.
The upper end portion of the shoulder belt 26A is wound around a shoulder anchor, not shown, provided on the vehicle body. In addition, the end of the webbing 26 is wound around a retractor not shown in the drawings. Here, a structure is formed: when the webbing 26 is pulled out urgently, the retractor operates an emergency locking mechanism to lock the pulling out of the webbing 26. In addition, at the retractor, a pretensioner mechanism that operates when a collision is detected to forcibly wind the webbing 26 is provided.
(side airbag device 12)
As shown in fig. 2, the side airbag apparatus 12 is equipped with an inflator 42. The inflator 42 is a cylinder-type gas generator formed in a substantially cylindrical shape, and the axial direction thereof is a direction along a side frame 52A (see fig. 3) constituting the framework of the seat back 18. Further, the lower end portion 42A of the inflator 42 is connected to the connecting portion 44A of the side airbag 44. A gas discharge portion is provided at a lower end portion 42A of the inflator 42.
The inflator 42 is electrically connected to a control unit such as an ECU (electronic control unit). When a side collision of the vehicle is detected or predicted based on a signal from a sensor such as a side collision detection sensor that detects a side collision of the vehicle or a side collision prediction sensor that predicts a side collision, the inflator 42 is operated in accordance with a signal from the ECU. When the inflator 42 is operated, gas is generated from the gas ejection portion of the inflator 42 and supplied to the side bag 44. As the side impact detection sensor, for example, a pressure sensor, an acceleration sensor, and the like disposed on the side portion of the vehicle body can be used. In addition, as the side impact prediction sensor, for example, a pre-impact sensor equipped with a millimeter wave radar, a Laser Imaging Detection and Ranging, a stereo camera, and the like can be employed.
The side airbag 44 is housed inside the seat back 18, and inflates and deploys to the vehicle transverse direction outer side with respect to the occupant P by supplying gas generated by the inflator 42. Next, the side airbag 44 in the inflated and deployed state will be described, and then, the side airbag 44 in the stored state will be described.
The side airbag 44 is configured to include a lumbar chamber (lower chamber) 44B inflated and deployed from the shoulder S of the occupant P to the side of the seat left side (vehicle width direction outer side) of the lumbar L, and a head chamber (upper chamber) 44C inflated and deployed to the side of the seat left side of the head H of the occupant P. The side airbag 44 is configured as an integral bag body in which the lumbar chamber 44B and the head chamber 44C communicate with each other. Further, a conduit member 48 is provided inside the side airbag 44, and the conduit member 48 extends in the seat up-down direction so as to vertically connect the head chamber 44C and the lumbar chamber 44B of the side airbag 44.
The lumbar chamber 44B in the inflated and expanded state is disposed from the upper end to the lower end of the seat back 18 as viewed in the seat width direction, and has a substantially elliptical shape with a vertically central portion bulging toward the seat front side. The head chamber 44C in the inflated and expanded state is disposed from the head rest 20 to the upper end portion of the seatback 18, and is formed in a substantially rectangular shape so as to cover the head H of the occupant P as viewed in the seat width direction. Further, a portion between the lumbar chamber 44B and the head chamber 42B is located above the seat back 18, and is formed to have a short length in the vehicle front-rear direction as viewed from the seat width direction.
Here, as shown in fig. 1, the head chamber 44C is configured to expand and deploy toward a space between the upper rear face of the shoulder belt 26A and the headrest 20.
Next, the storage state of the side airbag 44 configured as described above will be described. As shown in fig. 3, the lumbar chamber 44B constituting the side airbag 44 of the present embodiment is housed in a vertically extending state in a vehicle left side portion of the seatback 18.
Here, inside the seat back 18, a seat back frame 52 that constitutes a skeleton of the seat back 18 is provided. The seat back frame 52 includes a pair of side frames 52A provided on both side portions of the seat back 18, and an upper frame 52B connecting upper end portions of the side frames 52A in the seat width direction. The lumbar chamber 44B extends in the folded state up and down along the outer surface of the left-side seat side frame 52A. As the folding method of the waist chamber 44B, various folding methods such as a roll folding method of folding into a roll shape and a bellows folding method of folding into a bellows shape can be employed.
The head chamber 44C is housed in a state of extending from the upper end portion of the lumbar chamber 44B toward the seat width direction inner side along the upper end portion of the seat back 18. Specifically, the head chamber 44C is curved inward in the seat width direction along the upper frame 52B in a folded state, and extends to the vicinity of the headrest 20. Therefore, the head chamber 44C extends further to the seat width direction inner side than the shoulder belt 26A as viewed from the seat front-rear direction.
As shown in fig. 5, the head chamber 44C extends along the rear portion of the upper frame 52B, and in the present embodiment, the head chamber 44C is provided on the seat rear side of the upper frame 52B as an example. As the folding manner of the head chamber 44C, various folding manners can be adopted as in the waist chamber 44B.
(lower side rupture line 60)
As shown in fig. 3 and 4, side support portions 18A that protrude toward the seat front side and support the upper body of the occupant P from the left and right sides are provided at the side portions on both sides of the seat back 18 in the seat width direction. The side support 18A corresponds to "a side portion on the outer side of the seat back" in the present invention. Further, a lower rupture line 60 as a lower rupture portion is provided in the side support portion 18A on the vehicle left side. In fig. 3 to 5, the lower side tear line 60 is exaggeratedly drawn for convenience of explanation, but actually has the same appearance as other sewn portions. The same is true for the upper side rupture line 62 to be described later.
The lower rupture line 60 extends vertically along the side support portion 18A from the lower end portion to the upper end portion of the seat back 18. The lower side rupture line 60 is configured to be more easily ruptured than other sewn portions that sew the skins of the seat back 18 together. Specifically, the lower rupture line 60 is set to a strength to the extent of rupture by the inflation pressure of the lumbar chamber 44B. Therefore, when gas is supplied from the inflator 42 to the lumbar chamber 44B, the lower rupture line 60 is ruptured by the inflation pressure of the lumbar chamber 44B, and the lumbar chamber 44B inflates and deploys from the side support portion 18A toward the seat front side.
(Upper side rupture line 62)
An upper side rupture line 62 is provided above the lower side rupture line 60 so as to be continuous with the lower side rupture line 60. The upper rupture line 62 extends along the upper portion of the side support portion 18A toward the rear surface side of the seat back 18, and further extends inward in the seat width direction toward the headrest 20.
The upper side tear line 62 is configured to be easier to tear than other sewn portions, as with the lower side tear line 60. Specifically, the upper rupture line 62 is set to a strength to the extent of rupture by the expansion pressure of the head chamber 44C. Therefore, when the gas is supplied to the head chamber 44C, the upper rupture line 62 is ruptured by the inflation pressure of the head chamber 44C, and the head chamber 44C expands across the upper frame 52B toward the seat front side.
Here, as shown in fig. 3, the upper side rupture line 62 extends further to the seat width direction inner side than the shoulder belt 26A in the worn state, as viewed from the seat front-rear direction.
As shown in fig. 5, the upper rupture line 62 extends from the upper end portion of the seatback 18 to the seat rear side of the upper frame 52B. Therefore, when the upper side rupture line 62 is ruptured, the skin of the shoulder portion 18B of the upper end portion of the seat back 18 is opened in a rolled manner toward the seat front side, and thereafter, the head chamber 44C is deployed from the seat back 18. Further, it is preferable that the starting point of the rupture of the upper rupture line 62 ruptured by the inflation pressure of the head chamber 44C be set further inward in the seat width direction than the shoulder belt 26A.
(action)
Next, the operation of the present embodiment will be explained.
As shown in fig. 1, in the vehicular occupant protection apparatus 10 according to the present embodiment, the side airbag 44 receives supply of gas from the inflator 42 and inflates and deploys laterally of the occupant P when a side collision of the vehicle is predicted or detected. Specifically, the lumbar chamber 44B constituting the side airbag 44 inflates and deploys laterally of the lumbar L on the vehicle transverse direction outer side of the occupant P, and the head chamber 44C constituting the side airbag 44 inflates and deploys laterally of the head H on the vehicle transverse direction outer side of the occupant P. Thus, at the time of a side collision of the vehicle, the vehicle transverse direction outer side with respect to the waist L and the head H of the occupant P is covered by the waist chamber 44B and the head chamber 44C, and the occupant P can be protected.
Here, as shown in fig. 3 and 4, the waist chamber 44B is ruptured by the lower rupture line 60 to be expanded and deployed, and the head chamber 44C is ruptured by the upper rupture line 62 to be expanded and deployed. The lower side rupture line 60 extends vertically to the side support portion 18A on the vehicle width direction outer side of the seat back 18, and the upper side rupture line 62 extends in the seat width direction to the upper end portion of the seat back 18 in continuous with the lower side rupture line 60. This allows the head chamber 44C to be inflated and deployed from a position closer to the head Hd of the occupant P than the shoulder belt 26A. As a result, the head chamber 44C can be inflated and deployed stably between the shoulder belt 26A and the vehicle seat 14.
In the present embodiment, as shown in fig. 3, the upper rupture line 62 extends further inward in the seat width direction than the shoulder belt 26A in the worn state, as viewed in the seat front-rear direction. Thus, the head chamber 44C can be inflated and deployed between the shoulder belt 26A and the vehicle seat 14 more reliably than in a configuration in which the upper rupture line 62 extends only to the seat width direction outer side of the shoulder belt 26A in the worn state.
Further, in the present embodiment, as shown in fig. 5, the head chamber 44C extends along the rear portion of the upper frame 52B. Here, although a cushion pad, not shown, for supporting the occupant P is provided inside the seat back 18, since there is no need to cushion the rear portion of the upper frame 52B, it is easy to secure a storage space of the head chamber 44C. Thus, as in the present embodiment, by extending the head chamber 44C along the rear portion of the upper frame 52B, the head chamber 44C can be housed without affecting the outer shape of the vehicle seat 14. That is, the head chamber 44C can suppress the upper end portion of the seat back 18 from bulging toward the seat rear side, and can suppress a reduction in the appearance.
Further, in the present embodiment, the upper side rupture line 62 is provided so as to return to the rear side of the upper frame 52B in plan view. Thus, the upper side rupture line 62 is less likely to contact the occupant P. That is, the upper side rupture line 62 can be prevented from being scratched by contact with the occupant P seated in the vehicle seat 14. This can suppress the upper fracture line 62 from being accidentally fractured. Further, since the upper side rupture line 62 is provided at a position that is not easily visible from the seat front side, it is possible to suppress a reduction in the appearance of the vehicle seat 14.
In the present embodiment, the upper side rupture line 62 is ruptured so that the skin of the shoulder portion 18B at the upper end portion of the seat back 18 is curled toward the seat front side. This allows the rolled skin to move and be wound around the shoulder belt 26A, and prevents the head chamber 44C from catching on the shoulder belt 26A during inflation and deployment. That is, the skin of the shoulder portion 18B of the seat back 18 can be made to function as a guide cloth, and the head chamber 44C can be inflated and expanded to a desired position along the skin.
Although the vehicle occupant protection apparatus 10 according to the embodiment and the modification example has been described above, it goes without saying that it can be implemented in various forms without departing from the scope of the present invention. For example, although the head chamber 44C is configured to extend further to the seat width direction inner side than the shoulder belt 26A in the worn state as viewed from the seat front-rear direction in the above-described embodiment as shown in fig. 3, the present invention is not limited to this. That is, the head chamber 44C may be configured to extend to a position overlapping the shoulder belt 26A in the worn state as viewed from the seat front-rear direction. Further, the upper side rupture line 62 and the lower side rupture line 60 may not be connected to each other.
In the above embodiment, as shown in fig. 4, the upper side rupture line 62 extending in the seat width direction at the upper end portion of the seat back 18 has been described, but the present invention is not limited to this. For example, the lower rupture line 6 may be extended to the seat back side of the side support portion 18A, and the upper rupture line 62 may be provided at a position offset to the seat lower side from the upper end portion of the seat back 18. In this case, the upper rupture line 62 extends further toward the seat lower side than the upper frame 52B in the seat width direction, and the head chamber 44C is inflated and expanded to the side of the head H of the occupant P beyond the seatback 18.
In the above embodiment, as shown in fig. 5, the head chamber 44C is provided on the seat rear side of the upper frame 52B, but the present invention is not limited to this. For example, the head chamber 44C may be provided on the upper surface side of the upper frame 52B along the rear portion of the upper frame 52B. In this case, if the head chamber 44C is disposed so that a reaction force acts from the upper frame 52B when the head chamber 44C is inflated and deployed, the head chamber 44C can be rapidly inflated and deployed toward the seat upper side and the seat front side.
Further, the lumbar chamber 44B is not limited to the shape shown in fig. 2 as long as it has a shape that covers the lumbar region L of the occupant P from the side. Similarly, the head chamber 44C is not limited to the shape shown in fig. 2 as long as it has a shape that covers the head H of the occupant P from the side. The folding form of the waist chamber 44B and the head chamber 44C is not particularly limited, and for example, the head chamber 44C may be folded while the waist chamber 44B is folded by cactus folding (cactus folding).

Claims (4)

1. An occupant protection device for a vehicle, comprising:
a lumbar chamber that is housed in a vertically extending state in a vehicle width direction outer side portion of a seat back of a vehicle seat, that receives supply of gas from an inflator when a side collision is predicted or detected, and that inflates and deploys toward a vehicle width direction outer side with respect to a lumbar portion of an occupant;
a head chamber that is housed in a state of extending from an upper end portion of the lumbar chamber toward a seat width direction inner side along an upper end portion of a seat back, receives supply of gas from the inflator when a side collision is predicted or detected, and inflates and deploys toward a vehicle width direction outer side with respect to a head of an occupant;
a lower rupture scheduled portion that is provided at a side portion on a vehicle width direction outer side of the seat back, extends vertically, and ruptures a skin of the seat back by an inflation pressure of the lumbar chamber; and
an upper side rupture scheduled portion that extends in a seat width direction to an upper portion of the seat back and ruptures a skin of the seat back by an inflation pressure of the head chamber.
2. The vehicular occupant protection apparatus according to claim 1, wherein a shoulder belt that restrains an upper body of an occupant to the seatback by being worn is provided that extends obliquely from a shoulder portion on a vehicle width direction outer side of the occupant seated in the vehicular seat to a waist portion on a vehicle width direction inner side,
the upper rupture scheduled portion extends to a position overlapping the shoulder belt in a worn state or to a seat width direction inner side than the shoulder belt, as viewed in a seat front-rear direction.
3. The vehicular occupant protection apparatus according to claim 1 or 2, wherein the head chamber is provided inside an upper end portion of the seat back, extending along a rear portion of the upper frame that extends in the seat width direction.
4. The vehicular occupant protection apparatus according to claim 3, wherein the upper side rupture scheduled portion is provided so as to wrap back from an upper end portion of the seatback to a seat rear side of the upper frame when viewed in plan.
CN202110816413.7A 2020-10-22 2021-07-20 Occupant protection device for vehicle Pending CN114379500A (en)

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