JP2019081455A - Seat structure - Google Patents

Abstract

To provide a seat structure which enables reduction of an injury value of an occupant seated on a seat when a load acts on a rear side part of a seat cushion frame from the seat rear side.SOLUTION: A seat structure 1 includes: a seat cushion frame 2 forming a framework of a seat cushion of a vehicle and having a rear side part 21 extending in a vehicle width direction at the vehicle rear side; and a brace 3 formed along a vehicle fore and aft direction and disposed between the seat cushion frame 2 and a support member 4 located below the seat cushion frame 2. The brace 3 has: a coupling part 31 coupled to the rear side part 21; a fixing part 32 fixed to the support member 4; and a fragile part 33 which is formed having low strength locally and is deformed by a load applied to the rear side part 21 from the vehicle rear side to displace the coupling part 31 to the vehicle front upper side and inhibit displacement of the support member 4.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sheet structure. In particular, the present invention relates to a seat structure capable of reducing an injury value of an occupant sitting on a seat when a load acts on the rear side portion of the seat cushion frame from behind the seat.

  A vehicle seat device disclosed in Patent Document 1 is known as a rear seat of a car. The seat device includes a seat cushion frame, a seat back frame, a seat support bracket provided upright on the seat cushion frame to connect the seat cushion frame and the seat back frame, and a pipe connecting lower ends of the seat back frame. And a hinge member attached to the seat support bracket and inserted into the pipe member. By enhancing the rigidity of the seat back frame by pivotally supporting the seat back frame by the hinge member inserted into the pipe member, the load in the loading space moves forward and collides with the pipe member at the time of a vehicle collision or sudden braking. Even in this case, deformation of the pipe member is suppressed.

JP, 2013-199170, A

  As described above, if the rigidity of a member to which load is applied from behind the seat and load is applied, for example, the rear side portion of the seat cushion frame extending in the vehicle width direction at the rear of the vehicle is increased, It is possible to suppress the accompanying excessive deformation of the rear side. However, the seat cushion frame is usually fixed via a brace to a support member such as a seat rail that slides a seat, and if the load acts on the rear side, the rigidity of the rear side is high. There is a possibility that an excessive load acts on the support member. As a result, the support member may partially come off. If the support member is detached from the other member, the seat itself is excessively displaced forward, and the seat belt presses the occupant's chest and abdomen, increasing the injury value of the occupant. If the rear side portion is formed of a low-rigidity member and deformed by the above-described load, it is possible to suppress the support member from coming off the mating member. However, a load that has collided with the rear side may move forward and upward to get over the rear side. The luggage which has passed over the rear side rushes into the seat back and collides with the back of the occupant, increasing the injury value of the occupant.

  One of the objects of the present invention is to provide a seat structure capable of reducing the injury value of the occupant sitting on the seat when a load acts on the rear side of the seat cushion frame from the rear of the seat.

The sheet structure according to one aspect of the present invention is
A seat cushion frame that forms a framework of a seat cushion of a vehicle and has a rear side extending in the vehicle width direction at the rear of the vehicle;
And a brace formed along the longitudinal direction of the vehicle and interposed between the seat cushion frame and a support member located below the seat cushion frame.
The brace is
A connecting part connected to the rear side;
A fixing portion fixed to the support member;
It is configured to have a low strength locally, and is deformed by a load from the rear of the vehicle with respect to the rear side, thereby displacing the connecting portion upward in the front of the vehicle and having a fragile portion that suppresses the displacement of the support member .

  The above seat structure can reduce the injury value to the occupant sitting on the seat when a load acts on the rear side of the seat cushion frame from the rear of the seat. As an example of the load from the rear of the vehicle to the rear side, there is a load generated by a load at the rear of the seat moving forward and colliding with the rear side at the time of a frontal collision or sudden braking. When a load collides with the rear side portion, the displacement of the support member is suppressed along with the deformation of the fragile portion, so that the displacement such that the support member is partially detached is not generated. Therefore, since the seat itself does not shift to the front excessively, compression of the chest and abdomen of the occupant by the seat belt can be suppressed, and the injury value of the occupant can be reduced. In addition, the load can not be displaced excessively forward by displacing the connecting portion of the brace upward and forward of the vehicle. As a result, the inrush amount of the luggage into the seat back is reduced, so that excessive collision of the luggage with the back of the occupant sitting on the seat can be suppressed, and the injury value of the occupant can be reduced.

FIG. 1 is a perspective view showing an outline of a sheet structure according to Embodiment 1. FIG. 5 is an enlarged perspective view schematically showing the vicinity of a brace provided in the sheet structure according to the first embodiment. It is sectional drawing which shows the state cut | disconnected by the (III)-(III) cutting plane line of the sheet | seat structure shown in FIG. It is a side view which shows the outline of the sheet | seat structure which concerns on the modification 1. FIG.

  The first embodiment of the sheet structure of the present invention will be described below with reference to FIGS. 1 to 3, and the first modification of the sheet structure of the present invention will be described below with reference to FIG. 4. The same reference numerals in the drawings indicate the same names.

Embodiment 1
[Sheet structure]
The seat structure 1 according to the first embodiment includes a seat cushion frame 2 forming a framework of a seat cushion (not shown) of a vehicle, and a brace interposed between the seat cushion frame 2 and a support member 4 positioned therebelow. And 3. The seat cushion frame 2 has a rear side 21 extending in the vehicle width direction at the rear of the vehicle. One of the features of the seat structure 1 is that the brace 3 is formed along the longitudinal direction of the vehicle, and when a load acts on the rear side portion 21 from the rear of the vehicle, the brace 3 urges specific displacement to suppress specific displacement. The point is that the unit 33 is provided. Hereinafter, each configuration of the seat structure 1 will be described in detail, taking a rear seat provided with a cargo space in the rear as an example. In this example, the load on the rear side 21 from the rear of the vehicle includes the load caused by the load P in the loading space moving forward and colliding with the rear side 21 at the time of a frontal collision or sudden braking. (Figure 3). Although the left and right sheets show separate separate sheets in FIG. 1, the left and right sheets may be integrated bench sheets. In FIG. 3, for convenience of explanation, the bolt 70 and the nut 71 are not shown in cross section but in the side thereof.

[Seat cushion frame]
The seat cushion frame 2 forms a framework of a seat cushion serving as a seat surface of an occupant, and is connected to a seat back frame 200 forming a framework of a seat back (not shown) supporting the occupant's back (FIG. 1) . The seat cushion frame 2 is disposed above the support member 4 described later. The support member 4 in the present example is a seat upper rail 41 which constitutes a seat rail together with the seat lower rail 51. The seat cushion frame 2 slides back and forth by the seat upper rail 41 sliding with respect to the seat lower rail 51.

  The seat cushion frame 2 of this example is formed in a rectangular frame shape, and includes a rear side 21 extending in the vehicle width direction at the rear of the vehicle, a front side 22 parallel to the rear side 21 at the front of the vehicle, and a rear side It has the left side part 23 and the right side part 24 which connect the both ends of the part 21 and the front side part 22. As shown in FIG. The shape of the rear side portion 21 is a cylindrical shape in this example (FIG. 2), but is not particularly limited, and may be a rectangular cylindrical shape or the like. Although the rear side portion 21 is composed of an ISO-FIX bar for fixing the child seat to the seat in this example, it may be composed of a seat cross member forming a framework different from the ISO-FIX bar. By configuring the rear side 21 with an ISO-FIX bar as in this example, even if a load acts on the rear side 21 from the rear of the vehicle, the rear side 21 is not deformed excessively. This is because the ISO-FIX bar is very rigid. A mounting bracket 25 for fixing the rear side 21 to the brace 3 is fixed to the rear side 21. The cross-sectional shape of the mounting bracket 25 is a letter (bracket) shape, and the opening is facing upward and is fixed below the rear side 21 so that a part of the rear side 21 is fitted. In FIG. 3, the mounting bracket is omitted for convenience of the description.

[Brace]
The brace 3 is interposed between the seat cushion frame 2 and the support member 4 located below the seat cushion frame 2. The brace 3 is formed along the longitudinal direction of the vehicle. The arrangement location of the brace 3 along the vehicle width direction is a location corresponding to the position of the support member 4 and in this example, is a position closer to the center in the vehicle width direction in the rear side 21 (FIG. 1). The brace 3 is formed of a hollow cylindrical body. The external shape seen in the vehicle width direction of the brace 3 is a bent shape (V shape), and the cross-sectional shape is a substantially rectangular shape (FIG. 2). The brace 3 is configured by joining two upper pieces 30U and lower pieces 30D in a bracket shape. Specifically, the opening sides of the upper piece 30U and the lower piece 30D face each other, and both side surfaces are overlapped and joined. The material of the upper piece 30U and the lower piece 30D (brace 3) may be a metal such as steel. The bonding between the upper piece 30U and the lower piece 30D may be welding. The brace 3 may not be formed by joining two members, but may be formed by a hollow cylindrical body made of a single piece. The brace 3 includes a connecting portion 31, a fixing portion 32 and a fragile portion 33.

(Connection part, fixed part)
The connecting portion 31 is connected to the rear side 21. The connection portion 31 is a portion on the rear side of the brace 3, and is formed to extend forward and downward from the rear side portion 21 (mounting bracket 25) so as to intersect the support member 4. The fixing portion 32 is fixed to the support member 4. The fixing portion 32 is a portion on the front side of the brace 3 and is formed to extend forward from the connecting portion 31 so as to be parallel to the support member 4. A bent portion 34 is formed between the connecting portion 31 of the brace 3 and the upper surface of the fixing portion 32.

  A plurality of (two in the present embodiment) insertion holes (not shown) through which the bolts 70 are inserted are formed in the lower surface of the fixed portion 32 (the lower surface of the lower piece 30D) (FIG. 3). In this example, the bolt 70 is inserted from the lower side of the support member 4 through the insertion hole on the upper surface of the support member 4 and the insertion hole on the lower surface of the fixed portion 32 and protrudes upward and is tightened by the nut 71. By fastening the bolt 70 and the nut 71, the fixing portion 32 and the support member 4 are fixed. The nut 71 is welded to the lower surface of the fixing portion 32 in this example.

(Vulnerable Department)
The fragile portion 33 is a portion of the brace 3 configured to have a low strength locally, and is deformed by a load from the rear of the vehicle on the rear side portion 21 (FIGS. 2 and 3). By this deformation, the connecting portion 31 is displaced upward in the forward direction of the vehicle, and the displacement of the support member 4 is suppressed. The suppression of the displacement of the support member 4 means that the displacement does not occur such that the support member 4 (the sheet upper rail 41 or the floor panel) is partially detached from the mating member (for example, the seat lower rail 51 or the base member of the floor panel). say.

  The fragile portion 33 may be, for example, a portion having a locally small cross-sectional area that cuts the longitudinal direction of the brace 3. This cross-sectional area is a part except internal space, when brace 3 is a cylindrical body. When the brace 3 is a cylindrical body, the portion where the cross-sectional area is locally small can be formed by providing a through hole or a notch in the constituent surface or providing a locally thin portion in the constituent surface. When the through hole or the notch is provided, the fragile portion 33 can be formed in the vicinity of the through hole or the notch. When the thin portion is provided, the fragile portion 33 can be formed into the thin portion. The formation location of the through hole, the notch, and the thin-walled portion includes at least the rear side with respect to the bent portion 34, that is, the connecting portion 31. Then, the fragile portion 33 can be provided in the connecting portion 31 on the rear side of the bending portion 34, and the connecting portion 31 can be easily displaced upward in the forward direction of the vehicle. In order to provide the fragile portion 33 in the vicinity of the bending portion 34 in the connecting portion 31, it is preferable to adjust the formation location, shape, size, number, etc. of the through holes and the notch or adjust the formation location of the thin portion. Of the connection portion 31, the upper surface (the upper surface of the upper piece 30U) and the side surface (the side surface of the upper piece 30U) may be mentioned as the formation locations of the through holes, the notches, and the thin portions. The through hole, the notch, and the thin-walled portion are preferably formed on the front side of the bent portion 34, that is, the fixed portion 32, in addition to the connecting portion 31. When forming a through hole, a notch, or a thin-walled portion also in the fixing portion 32, the forming portion includes a side surface (a side surface of the upper piece 30U or a side surface of the lower piece 30D) or a lower surface (a lower surface of the lower piece 30D). The shape of the through hole or the notch may be appropriately selected, such as a rectangular shape, a polygonal shape such as a triangular shape, a circular shape, or an elliptical shape, and the size and number of the through holes and the cutout may be appropriately selected. In the case where the brace 3 is a solid body such as a rod-like body, the fragile portion 33 can be configured by a portion having a small cross-sectional area formed locally in the longitudinal direction.

  The fragile portion 33 in this example is formed in the connecting portion 31 on the rear side of the bending portion 34 by providing the connecting side through hole 331 and the two fixed side through holes 332. A more specific location of the fragile portion 33 is in the vicinity of the bending portion 34 in the connecting portion 31. The connection side through hole 331 opens in the upper surface of the upper piece 30U in the connection portion 31, and its shape is rectangular. The connection side through hole 331 is provided rearward of the bending portion 34. Each fixed side through hole 332 is opened from the middle of both side surfaces of the lower piece 30D in the fixed portion 32 through the lower edge to the middle of the lower surface of the lower piece 30D, and the shape is L-shaped. Each fixed side through hole 332 is provided on the front side of the connection side through hole 331. Here, the front side means that the front end of each fixed side through hole 332 is in front of the front end of the connecting side through hole 331. That is, when the brace 3 is viewed laterally, the through holes 331 and 332 may partially overlap in the front-rear direction.

[Supporting member]
In the support member 4, the fixing portion 32 of the brace 3 is fixed. Thereby, the seat cushion frame 2 is fixed to the support member 4 via the brace 3. The supporting member 4 can be appropriately selected according to the type of sheet, and when the sheet is a slide sheet which can slide back and forth as in this example, the sheet upper rail 41 of the seat rail can be mentioned. In the case of a fixed seat which can not slide back and forth, a floor panel (not shown) may be mentioned. The seat rails include a pair of seat upper rails 41 disposed along the longitudinal direction of the seat cushion frame 2 and in parallel in the vehicle width direction, and a pair of seat lower rails 51 to which the respective seat upper rails 41 are slidably attached. Have. Each seat lower rail 51 is fixed to the floor panel along the front and back of the vehicle so as not to slide back and forth. The seat upper rail 41 to which the brace 3 is fixed is the seat upper rail 41 near the center of the seat cushion frame 2 among the pair of seat upper rails 41 (FIG. 1). The attachment of the seat upper rail 41 to the seat lower rail 51 can be performed after the fixing portion 32 of the brace 3 and the seat upper rail 41 are fixed.

[Brace behavior]
The behavior of the brace 3 when a load acts on the rear side 21 from the rear of the vehicle will be described mainly with reference to FIG. 3 (FIG. 2 as needed). The white arrows in FIG. 2 indicate the load on the brace 3 when a load acts on the rear side 21 from the rear of the vehicle. In FIG. 3, the front of the load application is indicated by a solid line, and the location displaced after the load application is indicated by a two-dot chain line. Black arrows in FIG. 3 indicate the moving direction of the rear side 21 and the connecting portion 31 of the brace 3.

  At the time of a frontal collision or sudden braking, as shown in FIG. 3, when the load P in the loading room behind the seat moves forward and collides with the rear side 21, the load from the vehicle rear is applied to the rear side 21. Works. The load is transmitted from the rear side 21 to the brace 3 as indicated by the white arrow in FIG. At this time, in the process of transferring the load from the connecting portion 31 to the fixing portion 32 side, the load is received by the bending portion 34 between the connecting portion 31 and the fixing portion 32, and stress is concentrated in the vicinity of both through holes 331 and 332. . When an excessive load is applied, as shown by the two-dot chain line in FIG. 3, the rear end of the connection portion 31 pivots forward and upward, and the fragile portion 33 of the connection portion 31 bends so as to protrude downward. . On the other hand, the load on the bending portion 34 and the bending of the fragile portion 33 suppress an excessive load acting on the fixing portion 32 in front of the bending portion 34, and the sheet upper through the fixing portion 32. It is suppressed that an excessive load acts on rail 41 (support member 4). As a result, excessive deformation of the fixing portion 32 is suppressed, and disengaging of the seat upper rail 41 from the seat lower rail 51 is suppressed, and excessive displacement of the seat itself in the forward direction is suppressed.

[Function effect]
In the seat structure 1 according to the first embodiment, when a load acts on the rear side 21 of the seat cushion frame 2 from behind the seat, it is possible to reduce the injury value to the occupant sitting on the seat. By providing the two through holes 331 and 332, the fragile portion 33 provided in the connecting portion 31 on the rear side of the bending portion 34 can be bent downward than the upper surface of the fixing portion 32. Therefore, the rear side portion 21 and the rear end side of the connecting portion 31 are displaced forward and upward of the vehicle. As a result, excessive displacement of the package P forward and upward can be suppressed, and the amount of rush of the package P into the seat back can be reduced. Therefore, excessive collision of the luggage P with the back of the occupant sitting on the seat can be suppressed, and the injury value of the occupant can be reduced. Further, by providing the both through holes 331 and 332, the bending portion 34 can receive the load when the load P collides with the rear side portion 21 from the rear thereof. Therefore, combined with the bending of the fragile portion 33, it is possible to suppress an excessive load acting on the fixed portion 32 in front of the bent portion 34, and to suppress an excessive deformation of the fixed portion 32. As a result, an excessive load can be suppressed from acting on the seat upper rail 41 to which the fixing portion 32 is fixed, and the seat upper rail 41 can be suppressed from being detached from the seat lower rail 51. Therefore, it is possible to suppress the forward displacement of the seat itself, to suppress the compression of the chest and abdomen of the occupant by the seat belt, and to reduce the injury value of the occupant. Furthermore, by providing the plurality of through holes 331, 332 for forming the fragile portion 33 in the brace 3, weight reduction of the brace 3, and further weight reduction of the sheet structure 1 can be achieved.

<< Modification 1 >>
The sheet structure 1 according to the modification 1 is characterized in that the fragile portion 33 of the brace 3 is formed by providing the connection side through hole 331 and the fixed side through hole 332 with the sheet structure 1 according to the first embodiment. Although the same, the position, the shape, the number, and the like of the coupling side through hole 331 and the fixed side through hole 332 forming the fragile portion 33 are different from the first embodiment. The following description will be made focusing on the differences, and the description of the same configuration will be omitted. FIG. 4 shows the brace 3 in a side view, and the mounting bracket is omitted for convenience of explanation as in FIG. 3.

[Brace]
(Vulnerable Department)
The fragile portion 33 does not open on the upper surface of the upper piece 30U in the connecting portion 31, but has a connecting side through hole 331 that opens on the side surface of the upper piece 30U, both side surfaces of the upper piece 30U in the fixed portion 32, and the lower piece 30D. By providing the fixed side through holes 332 opened on both side surfaces, the connecting portion 31 is formed in the rear of the bending portion 34. A more specific location of the fragile portion 33 is in the vicinity of the bending portion 34 in the connecting portion 31. The shapes of the connection side through holes 331 and the respective fixed side through holes 332 are triangular. The connection side through hole 331 is provided rearward of the bending portion 34, and each fixed side through hole 332 is provided forward of the connection side through hole 331. The fixed side through holes 332 of the side surface of the upper piece 30U and the fixed side through holes 332 of the side surface of the lower piece 30D are at substantially the same position in the front-rear direction.

  In the sheet structure 1 according to the first modification, as in the first embodiment, the fragile portion 33 is deformed by the action of the load on the rear side portion 21 from the rear side, so that the rear end side of the connecting portion 31 is forward It is pivoted upward. In addition, the seat upper rail 41 can be prevented from coming off the seat lower rail 51. Accordingly, excessive collision of the luggage P with the back of the occupant sitting on the seat can be suppressed, and compression of the chest and abdomen of the occupant by the seat belt can be suppressed, so that the injury value of the occupant can be reduced.

  The present invention is not limited to these exemplifications, is shown by the claims, and is intended to include all modifications within the scope and meaning equivalent to the claims. For example, the seat structure may be provided not only to the rear seat but also to a front seat provided in front of the vehicle. In this case, the load on the rear side from the rear of the vehicle means that a load placed in the foot space between the front seat and the rear seat moves forward and collides with the rear side at the time of a frontal collision or sudden braking. The load generated by

Reference Signs List 1 seat structure 2 seat cushion frame 21 rear side 22 front side 23 left side 24 right side 25 mounting bracket 3 brace 30U upper piece 30D lower piece 31 connecting part 32 fixing part 33 fragile part 331 connecting side through hole 332 fixed side through hole Hole 34 Bend 4 Support member 41 Seat upper rail 51 Seat lower rail 70 Bolt 71 Nut 200 Seat back frame P Luggage

Claims (1)

A seat cushion frame that forms a framework of a seat cushion of a vehicle and has a rear side extending in the vehicle width direction at the rear of the vehicle;
And a brace formed along the longitudinal direction of the vehicle and interposed between the seat cushion frame and a support member located below the seat cushion frame.
The brace is
A connecting part connected to the rear side;
A fixing portion fixed to the support member;
It is configured to have a low strength locally, and is deformed by a load from the rear of the vehicle with respect to the rear side, thereby displacing the connecting portion upward in the front of the vehicle and having a fragile portion that suppresses the displacement of the support member Sheet structure.

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