JP2007176350A - Vehicle seat equipped with airbag unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle seat equipped with an airbag unit which increases the fracturing property of a fracture section while suppressing the slipping off of a wire member from a pad member. <P>SOLUTION: A seat back 10 has the pad member, a seat skin, an insert wire 13, and a side airbag unit. The insert wire 13 has a vertical embedded section 13a and a horizontal embedded section 13b. Bent sections 13h at the boundary section between the vertical embedded section 13a and the horizontal embedded section 13b are formed into an arc form, and their radii of curvature R are 15 mm or higher. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle seat provided with an airbag unit.

  Conventionally, a vehicle seat in which a side airbag unit is accommodated in a seat back is known. In the thing of patent document 1, a seat back is extended in the up-down direction to the front side of the boundary part of the pad member, the skin member which covers the pad member, and the vehicle width direction center part and outer side edge part of a pad member. A wire member embedded and having a skin member fixed thereto, and a side airbag unit having an airbag provided in an outer end portion of the pad member in the vehicle width direction are provided.

The skin member has one end edge fixed to the wire member, the front surface portion covering the front surface of the pad width outer end portion of the pad member, and the one end edge portion coupled to the other end edge of the front surface portion. And a side surface portion covering the side surface of the vehicle width direction outer end portion. A breakage portion that is broken by the deployment pressure of the airbag is formed in the coupling portion between the front surface portion and the side surface portion so that the airbag is deployed outside the seat back when the airbag is deployed. A low elongation member is provided between the pad member and the front surface portion of the skin member. The low-extension member has one end edge portion fixed to the wire member, the other end edge portion fixed to the fracture portion, and an elongation rate lower than that of the skin member. For this reason, at the time of air bag deployment, extension of the front part of an outer skin member is controlled by the low extension member, and fracture of a fracture part is promoted. When deployed, the airbag protects the chest of an occupant seated on the vehicle seat.
JP 11-348709 A

  By the way, it is desirable that the airbag protects a wide range of the occupant's body in order to improve the occupant's protection. In this case, it is necessary to enlarge the airbag, and accordingly, the gas amount of the inflator must be increased. For this reason, the deployment pressure of the airbag is increased, and the front surface portion and the low extension member of the skin member are strongly pulled toward the fractured portion by the deployment pressure. As a result, the wire member may be detached from the pad member due to the tension of the front surface portion of the skin member and the low elongation member. Further, if the wire member is detached from the pad member, the breakability of the breakage portion is lowered.

  This invention is made in view of this point, The place made into the objective is providing the vehicle seat which improves the fracture property of a fracture | rupture part, suppressing that a wire member remove | deviates from a pad member. It is in.

1st invention is embed | buried so that a pad member, the skin member which covers this pad member, and at least one part may be extended in the up-down direction at the boundary part of the vehicle width direction center part and outer side edge part of this pad member, and A vehicle seat provided with a seat back having a wire member having an upper and lower buried portion to which the skin member is fixed, and a side airbag unit having an airbag provided in an outer end portion in the vehicle width direction of the pad member. The skin member has one end edge fixed to the upper and lower buried portion, the front surface portion covering the front surface of the pad width direction outer end portion, and the one end edge portion is the other end edge portion of the front surface portion. And a side surface portion that covers a side surface of the pad member in the vehicle width direction outer end portion, and the airbag is connected to the front surface portion and the connection portion of the side surface portion when the airbag is deployed. Outside the seat back A breaking portion that is broken by the deployment pressure of the airbag is formed so as to open, and the seat back is provided between the pad member and the front surface portion, and one end edge portion is formed in the upper and lower embedded portions. A front-side low-extension member for promoting breakage of the breakage portion when the airbag is deployed, the other end edge portion being fixed to the breakage portion, and having an elongation rate lower than that of the skin member. The wire member further has a horizontal embedded portion extending from the upper and lower embedded portions toward the inside in the vehicle width direction and embedded in the pad member;
A boundary portion between the upper and lower buried portions and the horizontal buried portion is formed in an arc shape, and a curvature radius thereof is 15 mm or more.

  As a result, the boundary portion between the upper and lower embedded portions and the horizontal embedded portion is formed in an arc shape and the radius of curvature thereof is set to 15 mm or more, so that the front surface portion of the skin member and the front low extension member are broken by the deployment pressure of the airbag. Even if pulled strongly to the side, the wire member can be prevented from coming off the pad member.

  Moreover, since it can suppress that a wire member remove | deviates from a pad member, the fracture | rupture property of a fracture | rupture part can be improved.

  In a second aspect based on the first aspect, the upper and lower embedded portions extend from the upper end portion of the pad member to the lower end portion, and the horizontal embedded portions are provided at the upper and lower ends of the upper and lower embedded portions. It is characterized by extending from at least one inward in the vehicle width direction.

  As a result, the upper and lower embedded portions extend from the upper end portion of the pad member to the lower end portion, and the horizontal embedded portions extend from at least one of the upper and lower end portions of the upper and lower embedded portions toward the inner side in the vehicle width direction. The buried portion is located at the upper end or the lower end of the pad member. Therefore, it can suppress that a wire member remove | deviates from a pad member, without deteriorating the seating property of a vehicle seat.

  According to a third invention, in the first or second invention, the horizontal burying portion extends to the vicinity of the center of the seat back in the vehicle width direction.

  Thereby, since the horizontal burying part is extended to the vicinity of the vehicle width direction center of a seat back, the length of a horizontal burying part can be made comparatively long. Therefore, even if the front surface portion of the skin member and the front low-elongation member are strongly pulled toward the breaking portion by the deployment pressure of the airbag, it is ensured that the wire member is detached from the pad member by the relatively long horizontal embedded portion. Can be suppressed.

  According to a fourth aspect of the present invention, in the first or second aspect of the invention, the upper and lower buried portions have an upper end positioned substantially at the same height as the upper end of the fracture portion or above the height position, and a lower end of the upper portion. It is characterized in that it is located at substantially the same height position as the lower end of the fracture portion or below the height position.

  Thereby, the upper end of the upper and lower buried portion is positioned at the same height position or higher than the upper end of the fracture portion, and the lower end is substantially the same height position as the lower end of the fracture portion or its height position. Since it is located below, the length of the upper and lower buried portions can be made relatively long. Therefore, the impact force transmitted from the front surface portion of the skin member and the front low extension member to the wire member can be absorbed by the upper and lower embedded portions. Therefore, it can suppress reliably that a wire member remove | deviates from a pad member.

  According to a fifth invention, in the first invention, the upper and lower embedded portions are embedded in the front surface side of the boundary portion of the pad member so as to extend in the vertical direction, and in the pad member It has a 2nd embedment part which has the upper and lower parts embedded so that the distance with a front surface may be extended in the up-and-down direction in the part larger than the embedment part of the 1st embedding part.

  As a result, the first embedded portion embedded in the vertical direction on the front side of the boundary portion between the vehicle width direction central portion and the outer end portion of the pad member and the front surface of the pad member And the second embedded portion having the upper and lower portions embedded in the vertical direction at a portion where the distance is larger than the embedded portion of the first embedded portion, so that the front surface portion and the front low extension member of the skin member are airbags. The wire member is pulled by the upper and lower portions of the second embedded portion embedded in a portion relatively distant from the front surface of the pad member (a relatively deep portion of the pad member) It can suppress reliably that it removes from a pad member.

  Moreover, since it can suppress reliably that a wire member remove | deviates from a pad member, the fracture | rupture property of a fracture | rupture part can be improved reliably.

  In a sixth aspect based on the first aspect, the airbag is configured to protect the chest of the seated occupant and at least one of the head and the waist when deployed. Is.

  As a result, when the airbag is deployed, it protects the chest of the seated occupant and at least one of the head and waist, so the deployment pressure of the airbag is greater than when protecting only the occupant's chest. Become. In this case, the effect of the present invention can be remarkably exhibited.

  According to the present invention, the boundary portion between the upper and lower buried portions and the horizontal buried portion is formed in an arc shape and the curvature radius is set to 15 mm or more, so that the wire member is prevented from coming off the pad member, Breakability can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a side view of a vehicle seat, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a front view of the seat back of the vehicle seat, FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4, and FIG. 6 is an enlarged view of the vicinity of the broken portion in FIG. FIG. 7 is an enlarged view of the vicinity of the groove in FIG.

  The vehicle seat according to the embodiment of the present invention is installed on the upper surface of the floor panel of the vehicle so that the left-right direction of the seat coincides with the vehicle width direction. Hereinafter, the passenger seat will be described as a vehicle seat. The configuration of the other seats is almost the same as that of the passenger seat.

  As shown in FIGS. 1 to 5, the passenger seat 1 includes a seat back 10 and a seat cushion 30. The seat back 10 is attached to the rear end portion of the seat cushion 30 so as to be able to fall on the upper surface of the seat cushion 30. Both end portions in the vehicle width direction of the seat back 10 constitute side support portions 10a that protrude (expand) to the front of the vehicle (corresponding to the front of the seat) from the center in the vehicle width direction. The front surfaces of these side support portions 10a and 10a are each formed in a substantially curved shape projecting forward of the vehicle when viewed from the side of the vehicle (corresponding to the side view of the seat). Each of them is formed in a curved shape that gradually protrudes (tilts) forward of the vehicle. For this reason, the front surfaces of both ends in the vehicle width direction of the pad member 11, which will be described later, are also formed in a substantially curved shape projecting forward of the vehicle in a side view of the vehicle, and gradually increase from the inside to the outside in the vehicle width direction in a plan sectional view. Each is formed in a curved shape projecting forward of the vehicle. The longest portion of each side support portion 10a having the longest distance between the front surface and the rear surface is located at the lower portion of the side support portion 10a (for example, the upper portion from the lower end of the side support portion 10a by 1/4 of the total length of the side support portion 10a). positioned. For this reason, the longest part where the distance between the front surface and the rear surface at each end in the vehicle width direction of the pad member 11 is the longest is also located below the pad member 11.

  The seat back 10 includes a pad member 11, a seat skin (corresponding to a skin member) 12, an insert wire (corresponding to a wire member) 13, and a side airbag unit 14.

  The pad member 11 is made of a sponge having a relatively high hardness. A groove portion 11d extends in the vertical direction on the vehicle front side of a boundary portion (boundary portion) 11c between a center portion 11a in the vehicle width direction of the pad member 11 and a left end portion (corresponding to an outer end portion in the vehicle width direction) 11b. Is formed. Thus, since the groove part 11d is formed in the boundary part 11c, this boundary part 11c is thinner than other parts. Four recesses 11e are formed at predetermined intervals on the bottom of the groove 11d. In these recesses 11e, the first embedded portion 13c of the upper and lower embedded portions 13a of the insert wire 13 is exposed so that the insert wire 13 can be visually recognized. The front surface of the pad member 11 includes the side surface and the bottom surface of the groove portion 11d of the pad member 11.

  Here, the pad member 11 is foam-molded. Since the boundary portion 11c of the pad member 11 is thinner than the other portions as described above, the molding is completed earlier than the other portions. For this reason, the boundary portion 11c has a higher density than the other portions and a hardness higher than the other portions.

  An airbag deployment space portion 11f is formed in the vehicle front side of the side airbag unit 14 of the pad member 11 so as to extend in the vertical direction. Deployment promotion means for accelerating the deployment and inflation of the waist protection portion 14e when the airbag 14a of the side airbag unit 14 is deployed at the lower portion of the airbag deployment space 11f. Is configured. A slit 11g is formed in the vehicle front side of the airbag deployment space 11f of the pad member 11 so as to extend in the vertical direction. The slit 11g connects the airbag deployment space portion 11f and a fracture portion 12e described later.

  The sheet skin 12 covers the outer surface of the pad member 11. The seat skin 12 is composed of a plurality of portions, and the left end edge portion is fixed (coupled) to the first embedded portion 13 c of the upper and lower embedded portions 13 a of the insert wire 13, and the pad member 11 has a center portion 11 a in the vehicle width direction. A central front surface portion 12a covering the front surface and a right edge portion (corresponding to one edge portion) are fixed to the first embedded portion 13c of the upper and lower embedded portions 13a of the insert wire 13, and cover the front surface of the left end portion 11b of the pad member 11. The outer front surface portion (corresponding to the front surface portion) 12b and the front end edge portion (corresponding to one end edge portion) are combined with the left end edge portion (corresponding to the other end edge portion) of the outer front surface portion 12b, and the left end of the pad member 11 The side surface portion 12c that covers the left side surface of the portion 11b and the rear surface portion 12f that covers the rear surface of the left end portion 11b of the pad member 11 are provided. The outer front surface portion 12b extends from the upper and lower embedded portions 13a of the insert wire 13 toward the outside of the vehicle. The side surface portion 12c extends from the coupling portion with the outer front surface portion 12b toward the vehicle rear (seat rear).

  The boundary portion between the central front surface portion 12a and the outer front surface portion 12b of the seat skin 12 constitutes a fold portion 12d that is recessed toward the rear of the vehicle. A breaking portion 12e is formed in the connecting portion between the outer front surface portion 12b and the side surface portion 12c of the seat skin 12 so as to extend in the vertical direction. When the airbag 14a of the side airbag unit 14 is deployed and inflated, the rupture portion 12e is ruptured by the deployment inflation pressure of the airbag 14a so that the airbag 14a is deployed and inflated outside the seat back 10. It has become.

  Between the front surface of the left end portion 11b of the pad member 11 and the outer front surface portion 12b of the seat skin 12, a front low extension member 15 is provided along these. The front low extension member 15 is a cloth for promoting the breakage of the breakage portion 12e when the airbag 14a is deployed and inflated. The front low extension member 15 has a right end edge portion (corresponding to one end edge portion) fixed to the first embedded portion 13c of the upper and lower embedded portions 13a of the insert wire 13, and a left end edge portion (corresponding to the other end edge portion) being a fractured portion. 12e is fixed, and the elongation rate is lower than that of the sheet skin 12. In other words, the front low elongation member 15 is less likely to extend than the seat skin 12. The front low extension member 15 has an upper end edge located above the height position of the side airbag unit 14, and a lower end edge located below the height position of the airbag deployment space 11f.

  Between the left side surface and the rear surface of the left end portion 11b of the pad member 11 and the side surface portion 12c and the rear surface portion 12f of the seat cover 12, an outer low extension member 16 is provided along these. The outer low extension member 16 is a cloth for promoting the breaking of the breaking portion 12e when the airbag 14a is deployed and inflated. The outer low extension member 16 has a front end edge portion fixed to the breaking portion 12e, and an end edge portion (rear end edge portion) opposite to the front end edge portion is more vehicle than the side airbag unit 14 in the seat back frame 17. It is fixed to the rear portion, and the elongation rate is lower than that of the seat skin 12. That is, the outer low extension member 16 extends between the left side surface and the rear surface of the left end portion 11b of the pad member 11 and the side surface portion 12c and the rear surface portion 12f of the seat cover 12, and then extends forward of the vehicle. The edge portion on the opposite side to the seat back frame 17 is fixed to the seat back frame 17 and is harder to extend than the seat skin 12. The seat back frame 17 is provided in the left end portion 11b of the pad member 11 so as to extend in the vertical direction, and is formed in a substantially L shape in plan sectional view.

  As described above, since the front low extension member 15 and the outer low extension member 16 are provided between the pad member 11 and the seat skin 12, when the airbag 14a is deployed and inflated, the outer front surface portion 12b and the side surface of the seat skin 12 are expanded. The elongation of the portion 12c is suppressed by the low elongation members 15 and 16, and the fracture of the fracture portion 12e is promoted.

  Here, a method for forming the fracture portion 12e of the sheet skin 12 will be briefly described with reference to FIG. First, the outer front surface portion 12b of the seat skin 12 and the front low elongation member 15 are overlapped, and the left end edges thereof are sewn together with the first sewing thread 18 to form a stitched portion. Further, the side surface portion 12c of the seat cover 12 and the outer low-extension member 16 are overlapped, and the front edge portions thereof are stitched together with the first sewing thread 18 to form a stitched portion. Then, these two stitched portions are stitched together with the second sewing thread 19. Then, each stitched portion is folded back to the back side to form a folded portion, and each folded portion is sewn with the third sewing thread 20. As described above, the fracture portion 12e is formed at the joint portion between the outer front surface portion 12b and the side surface portion 12c of the sheet skin 12. In the normal state, the space between the outer front surface portion 12b and the side surface portion 12c of the seat skin 12 is closed by the second sewing thread 19, and when the airbag 14a is deployed and inflated, the second sewing thread 19 is cut by the deploying and expanding pressure. Thus, an opening is formed between the outer front surface portion 12b and the side surface portion 12c of the seat cover 12, and the airbag 14a is deployed and inflated outside the seat back 10. Each folded portion may not be sewn with the third sewing thread 20.

  As shown in FIGS. 1 to 5, the insert wire 13 includes an upper and lower buried portion 13 a and upper and lower horizontal buried portions 13 b and 13 b.

  The upper and lower buried portions 13a are vertically moved in the vehicle front view (seat front view) from the upper end portion to the lower end portion of the pad member 11 at the boundary portion 11c between the vehicle width direction center portion 11a and the left end portion 11b of the pad member 11. It is buried so as to extend in the direction. The upper and lower embedded portions 13a have upper ends positioned above the height position of the upper end of the breaking portion 12e and the height position of the upper end edge of the front low extension member 15, and the lower end is located at the height position and the front side of the lower end of the breaking portion 12e. It is located below the height position of the lower end edge of the low extension member 15. The upper and lower embedded portions 13 a are formed in a substantially curved shape that protrudes forward in the vehicle side view so as to follow the central front surface portion 11 a (the bottom surface of the groove portion 11 d of the pad member 11) of the seat skin 11. The upper and lower buried portions 13a are upper and lower first buried portions 13c and 13c respectively embedded in the bottom portion (corresponding to the front side of the boundary portion) of the groove portion 11d of the boundary portion 11c, and the boundary portion 11c. The second embedded portion having an upper and lower portion 13e embedded in the portion extending in the vertical direction in a portion where the distance from the bottom surface of the groove portion 11d (corresponding to the front surface of the pad member) is larger than the embedded portion of each first embedded portion 13c. 13d. That is, the interval between each first embedded portion 13c and the bottom surface of the groove portion 11d is smaller than the interval between the upper and lower portions 13e of the second embedded portion 13d and the bottom surface of the groove portion 11d. The length of each 1st embedding part 13c is 100 mm or more, for example in the vehicle front view, and is 170 mm in this embodiment. The second embedded portion 13d is embedded on the vehicle rear side of the bottom surface of the groove portion 11d in the boundary portion 11c, and is disposed in the central portion of the upper and lower embedded portions 13a. The second embedded portion 13d is located at substantially the same height as the longest portion where the distance between the front surface and the rear surface of the left side support portion 10a is the largest. The second embedded portion 13d includes the above-described upper and lower portions 13e, and upper and lower step portions 13f and 13f that connect the first embedded portions 13c and the upper and lower portions 13e, respectively. The length of the upper and lower portions 13e is, for example, 50 to 80 mm when viewed from the front of the vehicle, and is 50 mm in the present embodiment. Each step 13f extends in the vehicle front-rear direction. The length of the upper step 13f is, for example, 10 to 20 mm, and is 10 mm in the present embodiment. The length of the lower step 13f is, for example, 15 to 30 mm, and is 15 mm in the present embodiment. The upper and lower step portions 13f, 13f are preferably long.

  As shown in FIG. 4, the upper and lower horizontal buried portions 13b and 13b extend from both ends of the upper and lower buried portions 13a toward the inner side in the vehicle width direction (the center side in the vehicle width direction of the seat back 10), respectively. 11 is embedded in the vehicle width direction central portion 11a. The upper horizontal burying portion 13b is located above the height position of the upper end of the fracture portion 12e. The lower horizontal burying portion 13b is located below the height position of the lower end of the breaking portion 12e. The front end portion of each horizontal burying portion 13b is folded back, and this constitutes a folded portion 13g. Each horizontal buried portion 13b extends to the vicinity of the center of the seat back 10 (pad member 11) in the vehicle width direction. The length of each horizontal burying part 13b is 50 mm or more, for example, and is 300 mm in this embodiment.

  The upper and lower bent portions 13h and 13h of the boundary portion between the upper and lower buried portions 13a and the horizontal buried portions 13b are each formed in an arc shape. The curvature radius R of each bent portion 13h is 15 mm or more and 200 mm or less, and in this embodiment, 20 mm. The radius of curvature R is measured with respect to the central axis of the insert wire 13. Further, the reason why the radius of curvature R is set to 200 mm or less is that if the radius of curvature R is larger than this, the shape of the insert wire 13 cannot be maintained in a predetermined shape with respect to the shape of the seat back 10, or the length of the upper and lower embedded portions 13 a is long. It is because it becomes shorter than the required length.

  Here, a method for manufacturing the insert wire 13 will be briefly described with reference to FIGS. 1, 4, and 5. That is, the upper and lower horizontal buried portions 13b and 13b are formed by bending the upper end portion and the lower end portion of one wire in the vehicle width direction, respectively. And the 2nd embedment part 13d is formed by bending the central part of the wire so as to protrude in a U-shape rearward of the vehicle. Thus, the insert wire 13 is manufactured.

  The foam molding method for the pad member 11 will be briefly described. First, a mold for foam-molding the pad member 11 is installed so that the side on which the front surface of the pad member 11 is molded is on the lower side. And the insert wire 13 is arrange | positioned in the predetermined position in a metal mold | die. Then, a foam material containing a foaming agent is poured into the mold and foamed. Thus, the pad member 11 is foam-molded. Since the boundary portion 11c of the pad member 11 is thinner than the other portions as described above, the boundary portion 11c is filled with the foaming agent when the pad member 11 is foam-molded. It is maintained for a relatively long time.

  A method for fixing the seat skin 12 and the front extending member 15 to the insert wire 13 will be briefly described with reference to FIG. First, the left end edge portion of the center front surface portion 12a of the seat skin 12, the right end edge portion of the outer front surface portion 12b of the seat skin 12 and the right end edge portion of the front low elongation member 15 are sewn together with the first sewing thread 21, and the stitched portion is thus sewn. Form. And the part corresponding to the recessed part 11e in this stitching part is fastened to the resin pin 23 with the second sewing thread 24. Then, these resin pins 23 are fixed to portions corresponding to the recesses 11e in the first embedded portions 13c and 13c of the insert wire 13 with O-rings (hook rings) 22, and the seat skin 12 and the front low-extension member 15 are attached. Cover the pad member 11. As described above, the center front surface portion 12 a and the outer front surface portion 12 b of the seat skin 12 and the front low extension member 15 are fixed to the insert wire 13 through the O-ring 22.

  As shown in FIGS. 1 and 3, the side airbag unit 14 is for protecting the occupant P seated on the passenger seat 1 at the time of a side collision of the vehicle. The side airbag unit 14 is provided in a central portion in the left end portion 11b of the pad member 11 (in the left side support portion 10a of the seat back 10). That is, the side airbag unit 14 is disposed on the outer side in the vehicle width direction than the insert wire 13. The side airbag unit 14 includes an airbag 14a and an inflator 14b. These airbag 14a and inflator 14b are normally covered with paper 14c. Thus, when the airbag 14a and the inflator 14b are covered with the paper 14c, cost can be reduced compared with the case where these are accommodated in a casing.

  The air bag 14a is normally disposed in front of the inflator 14b in a folded state (see FIG. 3), and when the vehicle collides, the air bag deployment space is generated by the gas pressure from the inflator 14b. 11f expands and inflates, and the expansion and contraction pressure breaks the slit 11g and the breaking portion 12e to expand and expand outside the seat back 10. The airbag 14a protects the chest and waist of the occupant P during deployment and inflation (see FIG. 1). That is, the airbag 14a deployed and inflated outside the seat back 10 is provided so as to communicate with the chest protector 14d for protecting the chest of the occupant P and the chest protector 14d below the occupant P. And a waist protection portion 14e for protecting the waist. The waist protection portion 14e expands and expands at the same height position as the longest portion where the distance between the front surface and the rear surface of the left side support portion 10a is the largest. Thus, at the time of a side collision of the vehicle, the airbag 14a expands and inflates between the chest and waist of the occupant P and the vehicle body side wall (not shown), and the chest and waist of the occupant P collide with the vehicle body side wall. Is suppressed. The inflator 14 b is fixed to the left side surface of the seat back frame 17. A gas supply port (not shown) of the inflator 14b is connected to the lower part of the airbag 14a, and is closer to the waist protection part 14e than to the chest protection part 14e.

-Operation of side airbag unit-
Hereinafter, the operation of the side airbag unit 14 will be described.

  When the vehicle collides, the airbag 14a is deployed and inflated in the airbag deployment space portion 11f by the gas pressure from the inflator 14b, and the slit 11g and the rupture portion 12e are broken by the deployment and inflation pressure. And expands and expands between the chest and waist of the occupant P and the side wall of the vehicle body.

  Here, when the airbag 14a is deployed and inflated, the outer front surface portion 12b and the front low extension member 15 of the seat skin 12 are strongly pulled toward the breaking portion 12e side (left diagonally forward) by the deployment inflation pressure. It is possible to prevent the insert wire 13 from coming off the pad member 11 by providing the second embedded portion 13d in the upper and lower embedded portion 13a or by setting the curvature radius R of the bent portion 13h of the insert wire 13 to 15 mm or more.

-Test sample-
Hereinafter, the test sample and the comparative sample will be described.

(Test sample 1)
As the test sample 1, a pad member in which an insert wire was embedded was used. In this test sample 1, the diameter of the insert wire is 2 mm, the upper and lower embedded portions are configured only by the first embedded portion, the length of the upper and lower embedded portions is 398 mm when viewed from the front of the vehicle, and the length of each horizontal embedded portion is The radius of curvature of the bent portion was 20 mm. The pad member had a hardness of 100 N and a specific gravity of 0.036 g / cm ³ . The hardness of the pad member is a measured value obtained by measuring a force applied to the disk when a disk having a diameter of 200 mm is pressed against the front surface of the pad member and the shrinkage rate becomes 25%.

(Test sample 2)
As the test sample 2, a pad member in which an insert wire was embedded was used. In this test sample 2, the upper and lower buried portions are constituted by the first and second buried portions, the length of the upper first buried portion is 171 mm in the vehicle front view, and the length of the lower first buried portion is the front of the vehicle. The length of the upper and lower portions of the second embedded portion is 50 mm when viewed from the front of the vehicle, the length of the upper step portion of the second embedded portion is 10 mm, and the length of the lower step portion of the second embedded portion Was 15 mm. In other respects, the configuration was almost the same as that of the test sample 1.

(Comparative sample)
As a comparative sample, a pad member embedded with an insert wire was used. In this comparative sample, the upper and lower buried portions were constituted only by the first buried portion, and the bent portion was bent at a substantially right angle. In other respects, the configuration was almost the same as that of the test sample 1.

-Test-
Hereinafter, tests performed on the test sample and the comparative sample will be described.

(Test 1)
The portion corresponding to the uppermost recess in the insert wires of Test Sample 1, Test Sample 2 and Comparative Sample was pulled to the front side of the pad member, and the tensile load when the insert wire was detached from the pad member (peeled) was measured. .

(Test 2)
The part corresponding to each recessed part in the insert wire of the test sample 1, the test sample 2, and the comparative sample was simultaneously pulled to the front surface side of the pad member, and the tensile load when the insert wire was detached from the pad member was measured.

-Test results-
Hereinafter, the results of tests performed on the test sample and the comparative sample are shown.

  As a result of Test 1, the measured values of Test Sample 1, Test Sample 2, and Comparative Sample were 214.6N, 216.0N, and 132.6N, respectively.

  As a result of Test 2, the measured values of Test Sample 1, Test Sample 2, and Comparative Sample were 399.4N, 415.6N, and 320.6N, respectively.

  From the above, it was found that the insert wire can be prevented from coming off the pad member by setting the radius of curvature of the bent portion to 20 mm. Moreover, it turned out that it can suppress that an insert wire remove | deviates from a pad member by providing a 2nd embedding part in the up-and-down embedding part of an insert wire.

-Effect-
As described above, according to the present embodiment, the bent portion 13h at the boundary between the upper and lower embedded portions 13a and the horizontal embedded portion 13b is formed in an arc shape and the curvature radius R is set to 15 mm or more. Even when the front surface portion 12b and the front low extension member 15 are strongly pulled toward the breaking portion 12e by the deployment pressure of the airbag 14a, it is possible to prevent the insert wire 13 from being detached from the pad member 11.

  Moreover, since it can suppress that the insert wire 13 remove | deviates from the pad member 11, the fracture | rupture property of the fracture | rupture part 12e can be improved.

  Moreover, since the breakability of the fracture | rupture part 12e can be improved, it can suppress that the seat back 10 deform | transforms.

  Further, since the upper and lower embedded portions 13a extend from the upper end portion to the lower end portion of the pad member 11, and the horizontal embedded portions 13b extend from both ends of the upper and lower embedded portions 13a toward the inside in the vehicle width direction, The parts 13b and 13b are located at the upper end and the lower end of the pad member 11, respectively. Therefore, it is possible to suppress the insert wire 13 from coming off the pad member 11 without deteriorating the seating property of the vehicle seat 1.

  Moreover, since the horizontal burying part 13b is extended to the vicinity of the vehicle width direction center of the seat back 10, the length of the horizontal burying part 13b can be made comparatively long. Therefore, even if the outer front surface portion 12b and the front low extension member 15 of the seat skin 12 are strongly pulled to the breaking portion 12e side by the deployment pressure of the airbag 14a, the insert wire 13 is inserted by the relatively long horizontal embedded portion 13b. Can be reliably prevented from coming off the pad member 11.

  Moreover, since the upper end of the upper and lower embedded part 13a is located above the height position of the upper end of the fracture | rupture part 12e, and the lower end is located below the height position of the lower end of the fracture | rupture part 12e, the upper and lower buried part 13a Can be made relatively long. Therefore, the impact force transmitted from the outer front surface portion 12b of the seat skin 12 and the front low extension member 15 to the insert wire 13 can be absorbed by the upper and lower embedded portions 13a. Therefore, it can suppress reliably that the insert wire 13 remove | deviates from the pad member 11. FIG.

  Moreover, the 1st embedment part 13c embed | buried so that the up-and-down embedding part 13a might be extended in the bottom direction of the groove part 11d in the boundary part 11c of the vehicle width direction center part 11a of the pad member 11, and the left side edge part 11b, A second embedded portion 13d having an upper and lower portion 13e embedded so as to extend in the vertical direction at a portion where the distance from the bottom surface of the groove portion 11d in the boundary portion 11c of the pad member 11 is larger than the embedded portion of the first embedded portion 13c; Therefore, even if the outer front surface portion 12b of the seat skin 12 and the front low extension member 15 are strongly pulled toward the breaking portion 12e by the deployment pressure of the airbag 14a, they are relatively separated from the bottom surface of the groove portion 11d in the pad member 11. The insert wire 13 is padded by the upper and lower portions 13e of the second embedded portion 13d embedded in the site (a relatively deep site of the pad member 11). It can be reliably prevented from being removed from timber 11.

  In addition, since the airbag 14a protects the chest and waist of the seated occupant P when deployed, the deployment pressure of the airbag 14a is greater than when only the chest of the occupant P is protected. In this case, the effect of this embodiment can be exhibited notably.

(Other embodiments)
In the above embodiment, the second embedded portion 13d is embedded in the boundary portion 11c between the vehicle width direction central portion 11a and the left end portion 11b of the pad member 11, but is embedded in the left end portion 11b of the pad member 11. In particular, as shown in FIG. 3, the line L1 extending from the first embedded portion 13c in the rearward direction and the line L2 extending from the first embedded portion 13c in a direction substantially parallel to the outer front surface portion 12b, as shown in FIG. It is desirable to embed it within the area defined by In this case, it is necessary to embed the upper and lower portions 13e of the second embedded portion 13d in a portion where the distance from the front surface of the pad member 11 is larger than the embedded portion of the first embedded portion 13c.

  Moreover, in the said embodiment, although the 2nd embedding part 13d is arrange | positioned in the center part of the up-and-down embedding part 13a, you may arrange | position in the upper end part and lower end part of the up-and-down embedding part 13a.

  In the above embodiment, the second embedded portion 13d is entirely embedded in the pad member 11. However, a part of the second embedded portion 13d is exposed on the rear surface of the pad member 11 or protrudes from the rear surface of the pad member 11. You may let them.

  In the above embodiment, the airbag 14a protects the chest and waist of the occupant P when deployed, but may protect the chest and head of the occupant P or the chest, head and waist of the occupant P. . Also in this case, compared with the case where only the chest of the occupant P is protected, the deployment pressure of the airbag 14a is increased, and the effects of the above-described embodiment can be remarkably exhibited.

  Moreover, in the said embodiment, although the horizontal burying part 13b is provided in the both ends of the upper and lower burying part 13a, you may provide in either one of the upper end of the upper and lower burying part 13a, or a lower end. However, in order to reliably prevent the insert wire 13 from coming off the pad member 11, it is desirable to provide it at both ends. Furthermore, you may provide in parts other than the upper end and lower end of the up-and-down burying part 13a.

  Moreover, in the said embodiment, although the upper end of the up-and-down embedding part 13a is located above the height position of the upper end of the fracture | rupture part 12e, you may be located in the substantially same height position as this.

  Moreover, in the said embodiment, although the lower end of the up-and-down embedding part 13a is located below the height position of the lower end of the fracture | rupture part 12e, you may be located in the substantially same height position as this.

  Moreover, in the said embodiment, although the center front surface part 12a and the outer side front surface part 12b of the sheet | seat skin 12 and the front side low expansion | extension member 15 are being fixed to the insert wire 13 via the O-ring 22, they are fixed via the C-ring. You may do it. Furthermore, you may fix the center front surface part 12a and the outer side front surface part 12b of the sheet | seat skin 12 to the insert wire 13, and the front side low elongate member 15 by means other than these.

  Moreover, in the said embodiment, although the edge part on the opposite side to the front-end edge part in the outside low expansion | extension member 16 is being fixed to the part behind a vehicle rather than the side airbag unit 14 in the seat back frame 17, to this, Not limited to this, it may be fixed to a fixing member provided in a portion of the seat back 10 located behind the side airbag unit 14.

  Further, since the lower end portion of the pad member 11 is almost irrelevant to the sitting comfort of the vehicle seat 1, its thickness may be reduced to increase its hardness.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the vehicle seat including the airbag unit according to the present invention can be applied to an application for improving the breakability of the breakage portion while suppressing the wire member from being detached from the pad member.

1 is a side view of a vehicle seat according to an embodiment of the present invention. It is arrow sectional drawing of the II-II line | wire of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1. It is a front view of the seat back of a vehicle seat. It is arrow sectional drawing of the VV line | wire of FIG. FIG. 4 is an enlarged view in the vicinity of a broken portion of the sheet skin of FIG. 3. It is an enlarged view of the groove part vicinity of the pad member of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 10 Seat back 11 Pad member 12 Seat skin (skin member)
12b Outer front part (front part)
12c Side surface part 12e Breaking part 13 Insert wire (wire member)
13a Vertical buried portion 13b Horizontal buried portion 13c First buried portion 13d Second buried portion 13e Upper and lower portions 13h Bent portion 14 Side airbag unit 14a Airbag 15 Front low elongation member 16 Outside low elongation member P Crew

Claims (6)

A pad member, a skin member covering the pad member, and at least a part of the pad member extending in a vertical direction at a boundary portion between the vehicle width direction center portion and the outer end portion of the pad member, and the skin member is fixed A vehicle seat provided with a seat back having a wire member having an upper and lower buried portion and a side airbag unit having an airbag provided in an outer end portion in the vehicle width direction of the pad member,
One end edge of the skin member is fixed to the upper and lower embedded portion, a front surface portion covering the front surface of the outer end portion in the vehicle width direction of the pad member, and one end edge portion are coupled to the other end edge portion of the front surface portion. , And a side surface portion covering a side surface of the pad member in the vehicle width direction outer side end portion,
The connecting portion between the front surface portion and the side surface portion is formed with a breaking portion that is broken by the deployment pressure of the airbag so that the airbag is deployed outside the seat back when the airbag is deployed. ,
The seat back is provided between the pad member and the front surface portion, one end edge portion is fixed to the upper and lower embedded portions, the other end edge portion is fixed to the fracture portion, and the elongation rate is higher than that of the skin member. A lower low extension member for promoting the breakage of the breakage portion when the airbag is deployed,
The wire member further includes a horizontal burying portion that extends from the upper and lower buried portions toward the inside in the vehicle width direction and is buried in the pad member,
A vehicle seat provided with an airbag unit, wherein a boundary portion between the upper and lower buried portions and the horizontal buried portion is formed in an arc shape, and a radius of curvature thereof is 15 mm or more. In the vehicle seat provided with the airbag unit according to claim 1,
The upper and lower buried portions extend from the upper end portion of the pad member to the lower end portion,
The vehicle seat including an airbag unit, wherein the horizontal burying portion extends inward in the vehicle width direction from at least one of an upper end and a lower end of the upper and lower buried portions. In the vehicle seat provided with the airbag unit according to claim 1 or 2,
The vehicle seat including an airbag unit, wherein the horizontal burying portion extends to the vicinity of the center of the seat back in the vehicle width direction. In the vehicle seat provided with the airbag unit according to claim 1 or 2,
The upper and lower buried portions have upper ends positioned substantially at the same height as the upper ends of the fractured portions or above the height positions, and lower ends from the height positions or the height positions substantially the same as the lower ends of the fractured portions. The vehicle seat provided with the airbag unit characterized by being positioned below. In the vehicle seat provided with the airbag unit according to claim 1,
The upper and lower embedded portions are embedded in the first embedded portion such that the distance between the first embedded portion embedded in the front surface side of the boundary portion of the pad member and the front surface of the pad member is extended. A vehicle seat provided with an airbag unit, comprising: a second embedded portion having an upper and lower portion embedded in a larger portion so as to extend in a vertical direction. In the vehicle seat provided with the airbag unit according to claim 1,
A vehicle seat comprising an airbag unit, wherein the airbag is configured to protect a chest of a seated occupant and at least one of a head and a waist when deployed.

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