WO2016006319A1 - エアバッグ装置 - Google Patents
エアバッグ装置 Download PDFInfo
- Publication number
- WO2016006319A1 WO2016006319A1 PCT/JP2015/064104 JP2015064104W WO2016006319A1 WO 2016006319 A1 WO2016006319 A1 WO 2016006319A1 JP 2015064104 W JP2015064104 W JP 2015064104W WO 2016006319 A1 WO2016006319 A1 WO 2016006319A1
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- WO
- WIPO (PCT)
- Prior art keywords
- head
- side portion
- bag body
- inflated
- occupant
- Prior art date
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Classifications
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- 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
- B60R21/2334—Expansion control features
- B60R21/2338—Tethers
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- 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
- B60R21/203—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in steering wheels or steering columns
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- 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
-
- 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
- B60R2021/0002—Type of accident
- B60R2021/0009—Oblique collision
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- 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
- B60R2021/003—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks characterised by occupant or pedestian
- B60R2021/0039—Body parts of the occupant or pedestrian affected by the accident
- B60R2021/0048—Head
Definitions
- the present invention relates to an airbag device.
- the airbag device described in Patent Document 1 includes an airbag having a concave portion that extends in the vertical direction near the center of the occupant when inflated and deployed, and convex portions that are located on the left and right sides of the concave portion.
- the airbag When the airbag is inflated and deployed, the front side of the occupant's head enters the recess, and the occupant's head is protected from impact during a collision.
- the present invention has been made in view of the above circumstances, and is an air that can suppress the occupant's head from rolling on the surface of the airbag when an obstacle collides with the vehicle obliquely from the front.
- An object is to provide a bag device.
- the present inventors have found that when the vehicle is subjected to an impact from diagonally forward, the dynamic friction force and the straightness from the surface of the airbag in which the occupant's head is inflated and deployed.
- the present inventors have found that the head rotates by receiving a force, and that the dynamic frictional force and the surface direct force impart a moment to the occupant's head, and the present invention has been completed focusing on this.
- the present invention is an air bag apparatus for a vehicle including a bag body that is inflated and deployed by an inflating gas supplied when the vehicle receives an impact from the outside, wherein the bag body is a head of an occupant.
- a front part that inflates and expands rearward in a range extending from the left front side to the right front side, a left side part that inflates and expands so as to protrude rearward from the left edge part of the front part, and a right edge part of the front part
- a right side portion that inflates and deploys so as to protrude rearward from the rear, and the bag body inflates and deploys when the vehicle receives an impact from obliquely forward so that the front surface of the occupant head displaced obliquely forward is And the front surface of the occupant head is the surface of the front part in the pressed state, and the side surface of the occupant head presses the surface of the left side part or the right side part.
- a first direction moment is generated to rotate the occupant's head in the first direction by the frictional force, and a surface normal force and a dynamic frictional force that the side surface of the occupant's head receives from the surface of the left side part or the right side part.
- FIG. 5 It is sectional drawing which shows the state which the passenger
- FIG. 12 It is a figure which shows the relationship between the displacement direction of a passenger
- the graph shown in FIG. 12 is a graph showing an integrated value when the contact range between the occupant head and the bag body is different.
- the airbag apparatus 1 includes a bag body 2 that is inflated and deployed by an inflating gas G supplied when the vehicle receives an impact from the outside.
- the bag body 2 includes a front part 3, a left side part 4, and a right side part 5.
- the bag body 2 is configured by sewing a plurality of sheets.
- the material of the sheet is not particularly limited.
- the sheet is made of a flexible woven fabric made of polyester-based or polyamide-based yarn.
- the bag body 2 is stored in a folded state in a storage chamber (not shown) provided at the center of the steering wheel S.
- a shape-holding tether 6 that regulates the expansion and expansion of the bag body 2 is provided inside the bag body 2.
- the shape holding tether 6 is made of the same material as that of the bag body 2, for example.
- the shape maintaining tether 6 is provided inside the front part 3, inside the left side part 4, and inside the right side part 5.
- the bag body 2 is supplied with the inflation gas G and is inflated and deployed into a shape having the front part 3, the left side part 4, and the right side part 5. If the shape-maintaining tether 6 is not provided, the bag body 2 expands into a ball-like shape without irregularities.
- a gas supply port K is formed on the front surface of the front portion 3.
- the gas supply port K is connected to a gas generator not shown.
- the front portion 3 is inflated and deployed rearward toward a dummy simulating an occupant's head (hereinafter referred to as “dummy head H”).
- the front portion 3 in the inflated and deployed state has a circular shape having a diameter larger than the lateral width of the dummy head H when viewed from the dummy head H side (see FIG. 1A). Accordingly, the front portion 3 in the inflated and deployed state extends in a range extending from the left diagonal front to the right diagonal front of the dummy head H.
- the right side portion 5 expands and expands so as to protrude backward from the right edge portion of the front portion 3.
- the right side portion 5 in the inflated and deployed state has a convex arc shape on the right side when viewed from the dummy head H side (see FIG. 1A).
- the upper end portion of the left side portion 4 and the upper end portion of the right side portion 5 are continuous, and the lower end portion of the left side portion 4 and the lower end portion of the right side portion 5 are continuous.
- the left side part 4 and the right side part 5 constitute a cylindrical wall as a whole in the inflated and deployed state.
- the rear end surface of the cylindrical wall is located behind the rear surface of the front portion 3.
- the dynamic friction coefficient ⁇ ′ between them varies depending on the smoothness of the surface of the dummy head H and the material of the bag body 2, but is about 0.4, for example. Is done. The same applies to the dynamic friction coefficient ⁇ ′ between the left side surface and the left side portion 4 of the dummy head H and between the right side surface and the right side portion 5 of the dummy head H.
- the dummy head H When viewed from above, the dummy head H is assumed to be elliptical with the longitudinal direction as the major axis direction as shown in FIGS.
- the counterclockwise angle with respect to the front direction of the vehicle is a positive (+) angle (0 ° to + 180 °), and the clockwise angle is negative ( ⁇ ) (0 ° to -180 °).
- the moment to rotate the dummy head H clockwise (clockwise) about the vertical axis is defined as a positive (+) moment, and the moment to rotate counterclockwise (counterclockwise). A negative (-) moment.
- ⁇ is a value greater than 0 and less than 90 (0 ⁇ ⁇ 90).
- ⁇ is a value greater than 90 and less than 180 (90 ⁇ ⁇ 180).
- the dummy head H receives a surface normal force N that is a force in a direction perpendicular to the surface of the dummy head H from the surface of the bag body 2.
- the direction of the surface force N varies depending on the position of the dummy head H.
- the direction of the surface normal force N rotates the dummy head H counterclockwise in a range in the direction of ⁇ ° to less than 0 ° and in a range of more than 90 ° and less than + ⁇ °. It is the direction to try.
- the direction is such that the dummy head H is rotated clockwise in the range of the direction greater than 0 ° and less than 90 °. Therefore, when the other vehicle collides from the left front side, the direction in which the dummy head H with the plane force N is intended to rotate is reversed near the front and right side of the dummy head H.
- the distance t1 (see FIG. 9) between the line of action n of the surface normal force N and the center of gravity of the dummy head H is the arm length of the moment M1 that attempts to rotate the dummy head H by the surface direct force N.
- the dummy head H receives the dynamic friction force F from the surface of the bag body 2.
- the dynamic friction force F can be represented by the product of the surface normal force N and the dynamic friction force ⁇ ′, as shown in the following Expression 2.
- the direction of the dynamic friction force F varies depending on the position on the dummy head H as shown in FIG.
- the direction of the dynamic friction force F is a direction in which the dummy head H is intended to rotate clockwise in the range of ⁇ ° or more and less than + ⁇ °.
- the direction of the dynamic friction force F is a direction in which the dummy head H is intended to rotate counterclockwise in a range greater than + ⁇ ° and less than or equal to + ⁇ °. In this way, the direction of rotating the dummy head H of the dynamic friction force F is reversed with respect to the direction of + ⁇ °.
- the direction of + ⁇ ° is between the direction of 0 ° and the direction of 90 °. Therefore, when the other vehicle collides from the left front side, the direction of rotating the dummy head H of the dynamic friction force F is reversed near the boundary between the front part 3 and the left side part 4. As shown in FIG. 10, the reversal of the direction of the dynamic friction force F is determined by whether the displacement direction of the dummy head H is on the right side with respect to the action line n of the surface normal force N (see FIG. 10A). It is caused by the difference in whether it is on the left side (see FIG. 10B).
- the moment M2 can be expressed by the product of the dynamic friction force F and the arm length t2, as shown in the following Equation 3.
- the moment M1 (indicated by the solid line) generated by the plane force N is a negative moment in the range greater than - ⁇ ° and less than 0 ° and in the range greater than 90 ° and less than 180 °. .
- the moment is positive.
- the sum S (indicated by broken lines) of the moment M1 and the moment M2 is a positive moment in the range from ⁇ ° to less than ⁇ °. On the other hand, in the range greater than ⁇ ° and 180 ° or less, it is a negative moment.
- the integral value IS1 is maximum at ⁇ ° and zero at ⁇ °.
- ⁇ is a value greater than 90 and less than 180 (about 130 in the example shown in FIG. 12).
- the dummy head H presses the bag body 2 in the range of ⁇ ° to ⁇ ° (if ⁇ in FIG. 7 is equal to ⁇ ), the sum of moments acting on the dummy head H becomes zero, The rotation (rolling) of the dummy head H is prevented. Even if the sum of moments does not become zero, if the dummy head H presses the bag body 2 within a range close to zero (if ⁇ is set in the vicinity of ⁇ ), the dummy head H Rotation can be suppressed.
- the range in which the dummy head H presses the bag body 2 is not limited to the range shown in FIG.
- the sum of moments (integrated value IS2) becomes zero at ⁇ ° smaller than ⁇ °, as shown in FIG. Even in this case, the rotation of the dummy head H can be prevented.
- ⁇ is about 110.
- the bag body 2 is inflated and deployed, so that the front surface of the dummy head H is the front portion. 3 is pressed, and the left side surface of the dummy head H is in a pressed state in which the surface of the left side portion 4 is pressed.
- a moment in the right direction is generated that causes the dummy head H to rotate clockwise (clockwise) by the surface normal force N and the dynamic friction force F received by the front surface of the dummy head H from the surface of the front portion 3.
- the bag body 2 is inflated and deployed, so that the front surface of the dummy head H presses the surface of the front portion 3 and the dummy head H
- the right side surface is in a pressing state in which the surface of the right side portion 5 is pressed.
- a moment in the left direction that causes the dummy head H to rotate leftward is generated by the surface normal force N and the dynamic friction force F that the front surface of the dummy head H receives from the surface of the front portion 3.
- a rightward moment is generated to rotate the dummy head H in the right direction by the surface normal force N and the dynamic friction force F received by the right side surface of the head H from the surface of the right side portion 5. Since the leftward moment and the rightward moment cancel each other, the dummy head H can be prevented from rolling on the surface of the bag body 2.
- the left side portion 3 and the right side portion 4 are continuous and form an annular shape as a whole in the inflated and deployed state. For this reason, when an external force is applied to the left side portion 4 or the right side portion 5 in the inflated and deployed state, the stress is dispersed throughout the left side portion 4 and the right side portion 5. Therefore, for example, when the dummy head H collides with the left side portion 4 in the inflated and deployed state, the left side portion 4 is prevented from being excessively deformed. As a result, a leftward moment can be sufficiently generated and the dummy head H can be reliably suppressed from rolling on the surface of the bag body 2.
- the front part 3A in the inflated and deployed state has a quadrangular shape having a lateral width larger than the lateral width of the dummy head H as viewed from the dummy head H side (rear). Therefore, the front portion 3A in the inflated and expanded state extends in a range extending from the left diagonal front to the right diagonal front of the dummy head H.
- the right side portion 5A expands and expands so as to protrude rearward from the right edge portion of the front portion 3A.
- the right side portion 5A in the inflated and deployed state has a linear shape extending in the vertical direction when viewed from the dummy head H side.
- the left side portion 4A and the right side portion 5A are held in an inflated and deployed shape by the shape holding tether 6A.
- the airbag apparatus 1 ⁇ / b> B includes a connection tether 10.
- the connection tether 10 connects the left side portion 4 and the right side portion 5 and is positioned rearward of the front portion 3 in the inflated and deployed state of the bag body 2 as shown in FIG.
- the connecting tether 10 may have a string shape as shown in FIG. 15 or may have a belt shape.
- the connection tether 10 includes a connection tether 10 that connects the central portion of the left side portion 4 and the central portion of the right side portion 5, and the left side portion 4 and the right side portion 5. You may provide in the state which crossed the connection tether 10 which connects an upper side boundary part and a lower side boundary part in the cross.
- the expansion and deployment shapes of the left side portion 4 and the right side portion 5 can be more reliably held by the connecting tether 10. As shown in FIGS. 16 and 17, when the dummy head H enters between the left side portion 4 and the right side portion 5, the dummy head H pushes the connection tether 10. Then, since the left side part 4 and the right side part 5 are pulled by the connection tether 10 and bent toward the dummy head H side, the dummy head H can be protected so as to be wrapped from the left and right sides.
- the airbag apparatus 1C includes a connecting tether 10A.
- the connection tether 10A connects the left side portion 4A and the right side portion 5A, and is positioned rearward of the front portion 3A in the inflated and deployed state of the bag body 2A.
- the connecting tether 10A may have a string shape as shown in FIG. 18, or may have a belt shape. Further, for example, as shown in FIG. 18, a plurality of connection tethers 10 ⁇ / b> A that connect the central part of the left side part 4 and the central part of the right side part 5 may be provided at different heights in the vertical direction. .
- the expansion and deployment shapes of the left side portion 4A and the right side portion 5A can be more reliably held by the connecting tether 10A. Further, when the dummy head H enters between the left side portion 4A and the right side portion 5A, the dummy head H pushes the connecting tether 10A. Then, since the left side portion 4A and the right side portion 5A are pulled by the connecting tether 10A and bent toward the dummy head H side, the dummy head H can be protected so as to be wrapped from the left and right sides.
- the left side portion 4D in the airbag device 1D is inflated and deployed so as to protrude rearward from the left edge portion of the front portion 3D as shown in FIG.
- the left side portion 4D in the inflated and deployed state has a convex arc shape on the left side when viewed from the dummy head H side.
- the right side portion 5D expands and expands so as to protrude rearward from the right edge portion of the front portion 3D.
- the right side portion 5D in the inflated and deployed state has a convex arc shape on the right side when viewed from the dummy head H side.
- the upper end portion of the left side portion 4D and the upper end portion of the right side portion 5 are continuous, and the lower end portion of the left side portion 4D and the lower end portion of the right side portion 5D are continuous.
- the left side portion 4D and the right side portion 5D constitute an annular wall as a whole in the inflated and deployed state.
- the rear end portion of the annular wall is located behind the rear surface of the front portion 3D.
- the left side portion 4D includes an outer fabric constituting the arc outer peripheral portion and an inner fabric constituting the arc inner peripheral portion. Partially coupled on the part 3D side (coupled part d). Further, in the right side portion 4D, the outer fabric constituting the outer circumferential portion of the arc and the inner fabric constituting the inner circumferential portion of the arc are partially joined on the front portion 3D side. In the example shown in FIG. 19 (c), the outer fabric and the inner fabric are joined at regular intervals in the circumferential direction in the left side portion 4 and the right side portion 5.
- the bonding method is not particularly limited, and examples thereof include stitching between fabrics and bonding with an adhesive.
- the inside of the left side portion 4D and the inside of the front portion 3D communicate with each other, and the inside of the right side portion 5D and the inside of the front portion 3D communicate with each other.
- the left side portion 4D and the right side portion 4D are partially combined with the outer fabric constituting the arc outer peripheral portion and the inner fabric constituting the arc inner peripheral portion, respectively. Accordingly, the inflated and deployed shape of the bag body 2D can be held without providing a shape holding tether.
- the airbag device 1E has a partition wall 7 between the front portion 3 and the left side portion 4 and between the front portion 3 and the right side portion 5.
- a check valve 11 is provided on the partition wall 7.
- the check valve 11 is a valve that maintains the direction in which the expansion gas G flows in the direction from the front part 3 toward the left side part 4 and the direction from the front part 3 toward the right side part 5. Accordingly, the expansion gas G that has entered the left side portion 4 and the right side portion 5 is prevented from flowing back to the front portion 3.
- the method of making the internal pressure of the left side part 4 and the right side part 5 higher than the internal pressure of the front part 3 is not limited to the example shown in the fourth embodiment.
- a first gas generator (not shown) that supplies an expansion gas G1 to the left side portion 4 and the right side portion 5 and an expansion gas G2 to the front portion 3 are supplied.
- a second gas generator (not shown) may be provided to make the pressure of the expansion gas G1 higher than the pressure of the expansion gas G2.
- the airbag device 1F includes a base portion 12, a left side portion 4F, a right side portion 5F, a shape maintaining tether 6F, and a connecting tether 10, but does not include a front portion.
- the base portion 12 is provided in a range from the left diagonal front to the right diagonal front of the dummy head H.
- the base portion 12 is a portion for guiding the inflation gas to the left side portion 4F and the right side portion 5F, and has a smaller thickness in the expanded and deployed state than the front portion 3 (see FIG. 15).
- the left side portion 4F expands and expands so as to protrude rearward from the left edge portion of the base portion 12.
- the right side portion 5F expands and expands so as to protrude rearward from the right edge portion of the base portion 12.
- the front surface of the dummy head H displaced diagonally left forward is moved over the surface of the connection tether 10 by the vehicle body J receiving an impact from diagonally left front and inflating and deploying the bag body 2F.
- the left side surface of the dummy head H is in a pressing state in which the surface of the left side portion 4F is pressed.
- the contact range of the dummy head H with respect to the inflated and deployed bag body 2F and the connecting tether 10 is set so that the integrated value of the sum of the leftward moment and the rightward moment approaches zero, the dummy head H becomes the bag body. It can suppress reliably rolling on the surface of 2F and the connection tether 10.
- the lid 9 is a disc-shaped cover provided at the opening of the storage chamber for storing the bag body 2G. In a state in which the bag body 2F is inflated and deployed, the lid 9 is held between the left side portion 4F and the right side portion 5F, and is rearward of the base portion 12 and the rear ends of the left side portion 4F and the right side portion 5F. Located more forward.
- a moment in the right direction that causes the dummy head H to rotate in the right direction is generated by the surface normal force and dynamic friction force that the front surface of the dummy head H receives from the surface of the lid 9.
- a leftward moment is generated that causes the dummy head H to rotate leftward due to the surface normal force and kinetic frictional force that the left side of the left side receives from the surface of the left side portion 4F.
- the dummy head H can be prevented from rolling on the surface of the bag body 2F and the lid 9.
- the airbag device disclosed in the above embodiment is a vehicle airbag device including a bag body that is inflated and deployed by an inflation gas supplied when the vehicle receives an impact from the outside.
- a front part that inflates and expands backward in a range from the left front of the occupant's head to the right front, a left side part that inflates and expands so as to protrude rearward from the left edge of the front part, and the front
- An occupant head that is displaced obliquely forward as a result of the vehicle inflating and deploying when the vehicle receives an impact from obliquely forward.
- the front surface of the occupant head presses the surface of the front portion
- the side surface of the occupant head presses the surface of the left side portion or the right side portion.
- the surface of the front part A surface in which a first direction moment is generated to rotate the occupant's head in the first direction due to the received surface straight force and dynamic friction force, and the side surface of the occupant's head receives from the surface of the left side portion or the right side portion A second direction moment is generated to cause the occupant's head to rotate in a second direction that is opposite to the first direction by a direct force and a dynamic friction force.
- the front of the occupant's head presses the surface of the front part and the side surface of the occupant's head is on the left side or the right side when the vehicle receives an impact from diagonally forward and the bag body expands and deploys. It will be in the press state which presses the surface of a direction part. In the pressed state, a first direction moment is generated to rotate the occupant's head in the first direction due to the surface normal force and dynamic frictional force that the front surface of the occupant's head receives from the surface of the front part.
- a second directional moment is generated that causes the occupant's head to rotate in a second direction that is opposite to the first direction due to the surface normal force and the dynamic frictional force that the side faces receive from the surface of the left side part or the right side part. Since the first direction moment and the second direction moment cancel each other, it is possible to suppress the occupant's head from rolling on the surface of the bag body (airbag) when an obstacle collides with the vehicle from diagonally forward. Can do.
- the contact range of the occupant's head with the bag body in the inflated and deployed state is set such that the integrated value of the sum of the first direction moment and the second direction moment in the contact range approaches zero. It is preferred that
- the bag body is configured such that the pressure of the inflation gas introduced into the front portion, the left side portion, and the right side portion is the same.
- the configuration for differentiating the pressure introduced into each of the front portion, the left side portion, and the right side portion is unnecessary, so that the airbag device can be simply configured.
- the left side portion and the right side portion have an arcuate shape convex to the left side and a convex arc shape to the right side, respectively, in the inflated and deployed state. It is preferable that the parts are continuous and form an annular shape as a whole.
- the left side portion and the right side portion are continuous, and form an annular shape as a whole in the inflated and deployed state. For this reason, when an external force is applied to the left side portion or the right side portion in the inflated and deployed state, the stress is dispersed throughout the left side portion and the right side portion. Therefore, when the occupant head collides with the left or right side part in the inflated and deployed state, the side part on the side where the occupant head collides is prevented from being excessively deformed. As a result, the second direction moment can be sufficiently generated and the occupant head can be reliably prevented from rolling on the bag surface.
- the left side portion is partially joined on the front portion side, the outer fabric constituting the arc outer peripheral portion of the left side portion and the inner fabric constituting the arc inner peripheral portion,
- the right side portion it is preferable that an outer fabric constituting an arc outer peripheral portion of the right side portion and an inner fabric constituting an arc inner peripheral portion are partially joined on the front portion side.
- the expanded and deployed shape can be retained without providing a shape retaining tether.
- the left side portion and the right side portion have an internal pressure higher than that of the front portion.
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Abstract
Description
図1~13を参照しつつ、第1実施形態に係るエアバッグ装置1について説明する。
図14を参照しつつ、第1実施形態の変形例に係るエアバッグ装置1Aについて説明する。
図15~17を参照しつつ、第2実施形態に係るエアバッグ装置1Bついて説明する。第1実施形態と同様の構成については、同一の参照符号を付してその説明を省略する。
図18を参照しつつ、第2実施形態の変形例に係るエアバッグ装置1Cついて説明する。第1実施形態の変形例と同様の構成については、同一の参照符号を付してその説明を省略する。
図19を参照しつつ、第3実施形態の変形例に係るエアバッグ装置1Dについて説明する。
図20を参照しつつ、第4実施形態に係るエアバッグ装置1Eについて説明する。第1実施形態と同様の構成について、図1と同じ参照符号を付してその説明を省略する。
図24を参照しつつ、第5実施形態に係るエアバッグ装置1Fについて説明する。第2実施形態と同様の構成については、図15と同じ参照符号を付してその説明を省略する。
図25を参照しつつ、第6実施形態に係るエアバッグ装置1Gについて説明する。第5実施形態と同様の構成については、図24と同じ参照符号を付してその説明を省略する。
なお、上記各実施形態では、エアバッグ装置を運転席前方のステアリングホイールS内に設けているが、これに限られない。例えば、助手席前方のインストルメントパネルP内(図2参照)や、シートバックSBの後面に設けてもよい。
最後に、上記実施形態の中で開示された特徴的な構成およびそれに基づく作用効果についてまとめて説明する。
Claims (14)
- 車両が外部から衝撃を受けたときに供給される膨張用ガスにより膨張展開する袋体を備えた車両用のエアバッグ装置であって、
前記袋体は、
乗員の頭部の左斜め前方から右斜め前方に亘る範囲で後方に膨張展開する前方部と、
前記前方部の左縁部から後方へ迫り出すように膨張展開する左側方部と、
前記前方部の右縁部から後方へ迫り出すように膨張展開する右側方部とを備えるとともに、
車両が斜め前方から衝撃を受けて前記袋体が膨張展開することにより、斜め前方に変位した乗員頭部の前面が前記前方部の表面を押圧するとともに、乗員頭部の側面が前記左側方部または前記右側方部の表面を押圧する押圧状態となり、かつ、
前記押圧状態において、乗員頭部の前面が前記前方部の表面から受ける面直力および動摩擦力によって乗員頭部を第1方向に回転させようとする第1方向モーメントが発生するとともに、乗員頭部の側面が前記左側方部または前記右側方部の表面から受ける面直力および動摩擦力によって乗員頭部を前記第1方向とは逆方向である第2方向に回転させようとする第2方向モーメントが発生するように構成されていることを特徴とする、エアバッグ装置。 - 膨張展開状態の前記袋体に対する乗員頭部の接触範囲は、当該接触範囲における前記第1方向モーメントと前記第2方向モーメントの和の積分値がゼロに近づくように設定されることを特徴とする、請求項1に記載のエアバッグ装置。
- 前記袋体は、前記前方部、前記左側方部、および前記右側方部に導入される膨張用ガスの圧力が同じになるように構成されていることを特徴とする、請求項1または2に記載のエアバッグ装置。
- 前記左側方部および前記右側方部は、膨張展開状態において、正面視でそれぞれ左側に凸の円弧状および右側に凸の円弧状をなすとともに、一端部同士および他端部同士が連続して全体として円環状をなすことを特徴とする、請求項1乃至3のいずれかに記載のエアバッグ装置。
- 前記左側方部は、当該左側方部の円弧外周部を構成する外側生地と、円弧内周部を構成する内側生地が、前記前方部側において部分的に結合され、
前記右側方部は、当該右側方部の円弧外周部を構成する外側生地と、円弧内周部を構成する内側生地が、前記前方部側において部分的に結合されていることを特徴とする、請求項4に記載のエアバッグ装置。 - 前記左側方部および前記右側方部は、膨張展開状態において、上下方向に直線的に延びていることを特徴とする、請求項1乃至3のいずれかに記載のエアバッグ装置。
- 前記左側方部および前記右側方部は、その内部に設けられた形状保持テザーにより、膨張展開形状が保持されることを特徴とする、請求項4または6に記載のエアバッグ装置。
- 前記袋体の膨張展開状態において、前記左側方部および前記右側方部は、前記前方部よりも内部気圧が高いことを特徴とする、請求項1乃至7のいずれかに記載のエアバッグ装置。
- 前記左側方部と前記右側方部を連結するとともに、前記袋体の膨張展開状態において前記前方部よりも後方に位置する連結テザーが設けられていることを特徴とする、請求項1乃至8のいずれかに記載のエアバッグ装置。
- 前記袋体は、ステアリングホイール上で膨張展開するように構成されていることを特徴とする、請求項4、5、7、8、および9のいずれかに記載のエアバッグ装置。
- 前記袋体は、インストルメントパネル上で膨張展開するように構成されていることを特徴とする、請求項1乃至9のいずれかに記載のエアバッグ装置。
- 前記袋体は、シートバックの後面側で膨張展開するように構成されていることを特徴とする、請求項1乃至9のいずれかに記載のエアバッグ装置。
- 車両が外部から衝撃を受けたときに供給される膨張用ガスにより膨張展開する袋体を備えた車両用のエアバッグ装置であって、
前記袋体は、
乗員の頭部の左斜め前方から右斜め前方に亘る範囲に設けられたベース部と、
前記ベース部の左縁部から後方へ迫り出すように膨張展開する左側方部と、
前記ベース部の右縁部から後方へ迫り出すように膨張展開する右側方部と、
前記左側方部と前記右側方部を連結するとともに、前記袋体の膨張展開状態において前記ベース部よりも後方に位置する連結テザーとを備えるとともに、
車両が斜め前方から衝撃を受けて前記袋体が膨張展開することにより、斜め前方に変位した乗員頭部の前面が前記連結テザーの表面を押圧するとともに、乗員頭部の側面が前記左側方部または前記右側方部の表面を押圧する押圧状態となり、かつ、
前記押圧状態において、乗員頭部の前面が前記連結テザーの表面から受ける面直力および動摩擦力によって乗員頭部を第1方向に回転させようとする第1方向モーメントが発生するとともに、乗員頭部の側面が前記左側方部または前記右側方部の表面から受ける面直力および動摩擦力によって乗員頭部を前記第1方向とは逆方向である第2方向に回転させようとする第2方向モーメントが発生するように構成されていることを特徴とする、エアバッグ装置。 - 膨張展開状態の前記袋体および前記連結テザーに対する乗員頭部の接触範囲は、当該接触範囲における前記第1方向モーメントと前記第2方向モーメントの和の積分値がゼロに近づくように設定されることを特徴とする、請求項13に記載のエアバッグ装置。
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