JP3700262B2 - Energy absorption structure on the side of the vehicle body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an energy absorption structure for a side part of a vehicle body, and particularly belongs to the technical field of an airbag unit provided in the vicinity of a side part in a seat.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it is well known that an airbag unit is disposed on a steering handle to ensure the safety of an occupant during a frontal collision of a vehicle body. However, in recent years, as disclosed in, for example, Japanese Patent Application Laid-Open No. 6-64491, an airbag unit is disposed on a side portion in a seat, and the airbag is deployed on the side of an occupant at the time of a collision with a vehicle body side portion. It has been proposed to protect the occupant by absorbing side impact energy with the deployed airbag.
[0003]
On the other hand, a metal frame member is usually provided in the seat to ensure the strength and rigidity of the seat. The frame member includes a frame main body having left and right side portions in the vicinity of the left and right side portions in the seat so as to extend substantially along the left and right side portions of the seat, and a bracket frame attached to the frame main body. The bracket frame is attached to a knuckle member for adjusting the angle of the seat back with respect to the seat cushion. Thus, the seat back is supported so as to be rotatable with respect to the seat cushion and with high support rigidity.
[0004]
[Problems to be solved by the invention]
By the way, when the airbag unit is disposed on the side portion in the seat as in the above proposal example, the airbag unit receives a large force when the airbag is deployed, so that the airbag unit is limited to a limited space in the seat. It is necessary to install and fix the airbag unit firmly. However, it is difficult to provide another member in terms of space, the structure in the seat is complicated, and the cost is increased.
[0005]
The present invention has been made in view of such a point, and an object of the present invention is to provide a component by utilizing an existing frame member provided in the seat in order to ensure the strength and rigidity of the seat. The object is to improve the support rigidity of the airbag unit with a simple configuration without increasing the number of points.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, the airbag unit is directly attached to the upper portion of the bracket frame attached to the extended portion of the knuckle member and the frame body, and to the extended portion of the bracket frame . The portion extending from the attachment part to the attachment part of the airbag unit extends straight up and down as viewed from the side of the seat .
[0007]
Specifically, in the invention of claim 1, a frame main body having left and right side portions extending in the vertical direction substantially along the left and right side portions of the seat back in the vicinity of the left and right side portions in the seat back of the seat ; A frame member comprising a bracket frame attached to a portion of the side portion of the frame body on the outer side in the seat width direction so as to extend in the vertical direction along the side portion of the frame body; and above the rear portion of the seat cushion of the seat has extending and extending portion of the lower portion of the bracket frame is attached towards the knuckle member for performing angle adjustment of the seatback relative to the seat cushion, in a predetermined direction at a side near the frame body An energy absorption structure on the side of a vehicle body provided with an airbag unit disposed toward the vehicle is assumed.
[0008]
The airbag unit is directly attached to the upper portion of the bracket frame, and a portion of the bracket frame from the attachment portion to the extension portion to the attachment portion of the airbag unit is viewed from the side of the seat. It shall extend straight up and down .
[0009]
With this structure, since the airbag unit is directly attached to the bracket frame in the existing frame member having high strength and rigidity, the airbag unit does not move due to the force generated when the airbag is deployed. . Therefore, the support rigidity of the airbag unit can be improved with a simple configuration without increasing the number of parts.
[0010]
In the invention of claim 2, in the invention of claim 1, the frame body is formed by annularly forming a pipe material.
[0011]
As a result, the strength and rigidity of the frame body to which the bracket frame is attached are further improved, and the frame member is strengthened as a whole. Therefore, the support rigidity of the airbag unit can be further improved.
[0012]
In the invention of claim 3, in the invention of claim 1 or 2, d A bag unit is assumed to be provided on the seat center side with respect to bracket frame.
[0013]
Thus, even if an impact force or the like is applied to the side portion of the seat, the bracket frame having high strength and rigidity is not deformed, so that the airbag unit is protected by the bracket frame. Therefore, it is possible to prevent the impact force and the like from acting on the airbag unit and improve the protection of the airbag unit.
[0014]
According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, the airbag unit is disposed on a side portion on the side door side close to the seat in the seat back of the seat.
[0015]
Thus, the airbag can be easily deployed between the occupant and the side door close to the occupant at the time of a side collision, and the occupant can be prevented from colliding with the side door. Therefore, the passenger | crew's further safety | security can be ensured at the time of a side collision.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 2 and 3 show the left seat 1 of the front seat of the vehicle in the vehicle body side energy absorption structure according to the first embodiment of the present invention (in the following description, front and rear and left and right of the vehicle are simply referred to as front and rear and left and right). ), The seat 1 includes a seat cushion 2, a seat back 3, and a headrest 4. Sliders 7 and 7 extending in the front-rear direction are provided at the lower portions of the left and right ends of the seat cushion 2, and the sliders 7 are fixed to the floor at the front and rear portions via rail mounting members 10 and 10, respectively. The front and rear positions of the seat 1 can be adjusted by being engaged with the guide rails 8. Further, a knuckle member 9 is provided at the rear portion of the seat cushion 2 so as to be rotatable about a rotation shaft 11 extending in the left-right direction, and the seat back 3 is rotated with respect to the seat cushion 2 via the knuckle member 9. The angle of the seat back 3 can be adjusted by being connected so as to be rotatable around 11.
[0017]
The headrest 4 has a substantially U-shaped frame 5, and both end portions of the frame 5 project from the lower end surface of the headrest 4, and both end portions of the headrest 4 are arranged at the seat back 3. Are attached to the seat back 3 by being inserted into two holes respectively formed on the upper end surface of the seat back.
[0018]
A seat back frame 13 as a frame body in the frame member is provided on the outer periphery of the rear portion in the seat back 3, and the seat back frame 13 is formed by forming a steel pipe material into a substantially rectangular ring shape, It has upper and lower parts and left and right sides. The left and right side portions of the seat back frame 13 extend in the vertical direction substantially along the left and right side portions in the vicinity of the left and right side portions of the seat back 3. Two headrest adjusting members 14, 14 that can be fitted to both ends of the frame 5 protruding from the lower end surface of the headrest 4 on the upper portion of the seatback frame 13 to adjust the vertical position of the headrest 4. Is fixed.
[0019]
Between the left and right side portions of the seat back frame 13, as shown in FIGS. 1 and 4, five wire frames 18, 18,. Is provided. Both ends of each wire frame 18 are fixedly attached to the front sides of both left and right sides of the seat back frame 13 by welding.
[0020]
A pad 15 is provided on the front side of each wire frame 18, and the pad 15 is supported by each wire frame 18 so as not to escape backward when the occupant falls into the seat back 3. The pad 15 is supported by the seat back frame 13 so that the end portion of the pad 15 wraps backward from the outside of the seat back frame 13. The pad 15 includes a foamed urethane layer 17 and a urethane layer 16 that is softer than the foamed urethane layer 17 on the sheet outer surface side of the foamed urethane layer 17. The sheet outer surface of the urethane layer 16 in the pad 15 is covered with a skin material 19 made of a thin fabric. There is no pad 15 behind the wire frame 18 except for the vicinity of the seat back frame 13, and the rear portion of the seat back 3 is only covered with the skin material 19.
[0021]
Side support portions 2a, 2a bulging upward are provided at the left and right ends of the seat cushion 2, and side support portions 3a, 3a bulging forward are provided at the left and right ends of the seat back 3, respectively. It plays the role of supporting not to move.
[0022]
An airbag unit 21 is disposed in the vicinity of the left side portion of the seat back frame 13 in the side portion of the seat back 3 near the seat 1, that is, in the left side support portion 3 a. As shown in FIG. 5, the airbag unit 21 includes a reaction can 22 whose outer portion has a U-shaped cross section, and in the reaction can 22, a cylindrical can in which an ignition part and an explosive are built in the back side. A flat inflator 23 and an airbag 24 folded on the opening side are accommodated. The opening of the reaction can 22 is closed with paper 25 that can be easily broken by the deployment of the airbag. Although not shown, an ignition signal is supplied to the ignition part of the inflator 23 from an acceleration sensor that detects a side collision to the left side of the automobile. The ignition part ignites the explosive by the ignition signal. The air bag 24 is inflated and expanded by a large amount of gas generated at that time.
[0023]
A bracket frame 30 extending in the front-rear direction substantially along the left side portion of the seat back 3 is attached and fixed to the left side of the left side portion of the seat back frame 13 at the rear portion. The seat back frame 13 and the bracket frame 30 constitute a frame member of the seat back 3. The airbag unit 21 is provided on the center side (right side) of the seat with respect to the bracket frame 30. The airbag unit 21 is arranged such that the inflator 23 is positioned in the vicinity of the right side of the left side portion of the seat back frame 13 and the opening direction of the reaction can 22 is inclined to the left side with respect to the front.
[0024]
The bracket frame 30 is provided in the vicinity of the left side of the seat back 3 so as to extend vertically from the upper part of the airbag unit 21 to the lower part of the seat back 3 substantially along the left side. The airbag unit 21 is directly attached to the upper portion of the bracket frame 30 by two sets of upper and lower bolts 27 and 27 and nuts 28 and 28 with an attachment member 26 provided on the side surface of the reaction can 22. The bracket frame 30 is fixedly attached to a portion (extension portion) extending to the seat back side of the knuckle member 9 provided on the seat cushion 2 at the lower portion with two sets of bolts and nuts.
[0025]
The pad 15 is expanded and broken at the portion corresponding to the airbag unit 21 in the seat inner surface portion of the pad 15, that is, at a substantially front portion of the opening of the reaction can 22 in the airbag unit 21 due to the deployment pressure of the airbag 24. The notch groove part 33 used as the starting part which begins to perform is provided, and this notch groove part 33 is made weaker than another part. The cut groove 33 is provided at substantially the same height and over the same length in the vertical direction of the reaction can 22 and the seat back 3 of the airbag unit 21.
[0026]
On the other hand, a seam that is easy to break is formed at a location on the substantially extending line of the cut groove portion 33 in the skin material 19. When the airbag 24 is deployed, the pad 15 starts to break from the cut groove 33 due to the deployment pressure, and the pad 15 and the skin are along a line connecting the cut groove 33 and the seam of the skin material 19. The material 19 is broken and expanded, and the airbag 24 is deployed outside the seat back 3 from the portion.
[0027]
As shown in FIGS. 6 and 7, the airbag 24 has a substantially rectangular shape that is long in the vertical direction when deployed, and is deployed from the passenger's abdomen to the head between the passenger and the left side door 40. It is supposed to be.
[0028]
A felt member 38 is formed integrally with the foamed urethane layer 17 of the pad 15 on the side of the airbag unit 21 from the cut groove portion 33 on the seat inner surface of the pad 15 so that the airbag 24 is deployed. The pad 15 is prevented from scattering when the pad 15 is expanded and broken, and the reaction can 22 in the airbag unit 21 rubs against the foamed urethane layer 17 of the pad 15 due to vibration or the like. It serves to prevent you from doing.
[0029]
Although not shown, a frame member having a frame main body and a bracket frame is provided in the seat cushion 2 similarly to the seat back 3, and the bracket frame is moved forward from the rotating shaft 11 of the knuckle member 9. It is fixedly attached to the extending part.
[0030]
The operation when the airbag 24 is deployed due to a side collision in the energy absorbing structure for the side portion of the vehicle body having the above configuration will be described. First, when the acceleration sensor detects a side collision to the left side of the automobile, an ignition signal is supplied to the ignition unit of the inflator 23 and the ignition unit ignites. As a result, the explosive in the inflator 23 burns at a high speed, a large amount of gas is supplied to the airbag 24, and the airbag 24 tries to expand and deploy. Then, the airbag 24 breaks the paper 25 blocking the opening of the reaction can 22 by the deployment pressure and pushes the pad 15 to the outside of the seat. For this reason, the pad 15 begins to spread and break from the fragile portion, that is, the cut groove portion 33, and the pad 15 and the skin material 19 spread and break along the line connecting the cut groove portion 33 and the seam of the skin material 19. Then, the airbag 24 is deployed between the occupant outside the seat back 3 and the side door 40 from the location.
[0031]
Therefore, in the above-described embodiment, the airbag unit 21 is directly attached to the bracket frame 30 having high strength and rigidity attached to the knuckle member 9 and the seat back frame 13. The bag 24 is not moved by the force generated when it is deployed. Therefore, the increase in the number of parts can be prevented, and the support rigidity of the airbag unit 21 can be improved with a simple configuration.
[0032]
Further, since the seat back frame 13 in the seat back 3 is formed by pipe-shaped annular material, the strength and rigidity of the seat back frame 13 to which the bracket frame 30 is attached are further improved. Therefore, the support rigidity of the airbag unit 21 can be further increased.
[0033]
The bracket frame 30 is disposed in the vicinity of the left side portion of the seat back 3 so as to extend in the front-rear and vertical directions substantially along the left side portion, and the airbag unit 21 is located in the center of the seat with respect to the bracket frame 30. Since the bracket frame 30 having high strength and rigidity is not deformed even when an impact force or the like is applied to the side portion of the seat back 3, the airbag unit 21 is protected by the bracket frame 30. Is done. Therefore, it is possible to prevent the impact force or the like from acting on the airbag unit 21 and improve the protection of the airbag unit 21.
[0034]
Further, since the airbag unit 21 is disposed in the left side support portion 3a of the seat back 3, the airbag 24 is easily deployed between the occupant and the side door 40 due to a side collision to the left side portion of the automobile. It is possible to reliably prevent the passenger from colliding with the side door 40. In addition, a relatively large space can be provided in the side support portion 3 a of the seat back 3. Therefore, the airbag unit 21 can be accommodated in the seat 1 without hindering the sitting comfort of the occupant, and the safety of the occupant can be further improved during a side collision.
[0035]
In the above embodiment, the airbag unit 21 is disposed in the left side support portion 3a of the seat back 3, but the present invention is also applied to the case where it is disposed in the right side support portion 3a of the seat back 3. And collision between passengers can be prevented .
[0036]
【The invention's effect】
As described above, according to the first aspect of the present invention, the frame main body has the left and right side portions extending in the vertical direction substantially along the left and right side portions of the seat back in the vicinity of the left and right side portions in the seat back of the seat. A frame member including a bracket frame attached to a portion of the side portion of the frame body on the outer side in the seat width direction so as to extend vertically along the side portion of the frame body, and a rear portion of the seat cushion of the seat A vehicle body comprising a knuckle member having an extending portion that extends upward from above and to which a lower portion of the bracket frame is attached, and an airbag unit disposed in a predetermined direction in the vicinity of the side portion of the frame body relative energy absorbing structure of the side, as well as directly attached to the airbag unit to the top of the bracket frame, bracket frame By which is adapted to extend a portion extending mounting portion of the airbag unit from the mounting portion to said extended portion, the straight vertical direction as viewed from the sheet side in, without increasing the number of parts, simple structure Thus, the support rigidity of the airbag unit can be improved.
[0037]
According to the invention of claim 2, since the frame body is formed by annularly forming the pipe material, the support rigidity of the airbag unit can be further improved.
[0038]
According to the invention of claim 3, the air bag unit, by providing on the seat center side with respect to bracket frame, an impact force or the like is prevented from acting on the airbag unit, the protection of the airbag unit Improvement can be achieved.
[0039]
According to the invention of claim 4, by providing the airbag unit on the side portion on the side door side close to the seat in the seat back of the seat, further safety of the occupant at the time of a side collision can be achieved. it can.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along a line II in FIG.
FIG. 2 is a perspective view showing a seat in the vehicle body side energy absorbing structure according to Embodiment 1 of the present invention;
FIG. 3 is a side view showing a left side portion of a sheet.
FIG. 4 is a partially broken front view showing a main part of the seat back.
FIG. 5 is a perspective view showing an airbag unit.
FIG. 6 is a side view showing a deployed state of the airbag.
FIG. 7 is a front view showing a deployed state of the airbag.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 3 Seat back 9 Knuckle member 13 Seat back frame (frame main body)
15 Pad 21 Airbag unit 24 Airbag 30 Bracket frame 33 Cut groove

Claims (4)

A frame main body having left and right side portions extending in the vertical direction substantially along the left and right side portions of the seat back in the vicinity of the left and right side portions in the seat back of the seat; A frame member comprising a bracket frame attached to the portion so as to extend in the vertical direction along the side of the frame body ;
Has a extending portion the lower is mounted in the rear and extending upward from the bracket frame of the seat cushion of the seat, and the knuckle member for performing angle adjustment of the seatback relative to the seat cushion,
In the energy absorption structure of the vehicle body side part provided with an airbag unit arranged in a predetermined direction near the side part of the frame body,
The airbag unit is directly attached to the upper part of the bracket frame ,
The portion of the bracket frame extending from the attachment portion to the extension portion to the attachment portion of the airbag unit extends straight in the vertical direction when viewed from the side of the seat, and absorbs energy at the vehicle body side portion. Construction. In the energy absorption structure of the vehicle body side part according to claim 1,
An energy absorbing structure for a vehicle body side portion, wherein the frame body is formed by annularly forming a pipe material. In the energy absorption structure of the vehicle body side part according to claim 1 or 2,
Airbag unit, the energy absorbing structure of a vehicle body side, characterized in that provided on the seat center side with respect to bracket frame. In the energy absorption structure of the vehicle body side part according to claim 1, 2, or 3,
The air bag unit is disposed on a side portion on the side door side close to the seat in the seat back of the seat.

Images