JP6697213B2 - Seat structure - Google Patents

Description

  The present invention relates to a seat 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 is applied to the rear side of the seat cushion frame from the rear of the seat.

  As a rear seat of an automobile, the vehicle seat device of Patent Document 1 is known. This seat device includes a seat cushion frame, a seat back frame, a seat support bracket that is erected on the seat cushion frame to connect the seat cushion frame and the seat back frame, and a pipe that connects the lower end portions of the seat back frame to each other. And a hinge member attached to the seat support bracket and inserted into the pipe member. By increasing the rigidity of the seat back frame by pivotally supporting the seat back frame by the hinge member inserted in the pipe member, the luggage in the luggage compartment moves forward and collides with the pipe member during a vehicle collision or sudden braking. However, the deformation of the pipe member is suppressed.

JP, 2013-199170, A

  As described above, by increasing the rigidity of a member on which load is applied by collision of luggage or the like from the rear of the seat, for example, the rear side of the seat cushion frame extending in the vehicle width direction behind the vehicle, is increased, It is possible to suppress excessive deformation of the rear side part. However, the seat cushion frame is usually fixed to a supporting member such as a seat rail that slides a seat through a brace, and if the load acts on the rear side, the rigidity of the rear side is high. Therefore, an excessive load may be applied to the support member. Then, the support member may partly come off. When the support member is disengaged from the mating member, the seat itself is excessively displaced forward, and the seat belt presses the chest and abdomen of the occupant, increasing the injury value of the occupant. If the rear side portion is made of a low-rigidity member and is deformed by the load, it is possible to prevent the support member from coming off the mating member. However, luggage that has collided with the rear side portion may move forward and upward and get over the rear side portion. The luggage that has crossed over the rear side plunges into the seat back and collides with the back of the occupant, increasing the injury value of the occupant.

  An object of the present invention is to provide a seat structure capable of reducing an injury value of an occupant sitting on the seat when a load is applied to the rear side of the seat cushion frame from the rear of the seat.

The seat structure according to one embodiment of the present invention,
A seat cushion frame that forms a skeleton of a vehicle seat cushion and that has a rear side portion that extends in the vehicle width direction behind the vehicle;
A brace that is formed along the vehicle front-rear direction and that is interposed between the seat cushion frame and a support member located below the seat cushion frame;
The brace is
A connecting portion connected to the rear side portion,
A fixed portion fixed to the support member,
And a fragile portion that is locally configured to have low strength and that is deformed by a load applied to the rear side portion from the rear of the vehicle to displace the connecting portion upward and forward of the vehicle and suppress displacement of the support member. ..

  The seat structure can reduce the injury value to the occupant sitting on the seat when a load is applied to the rear side of the seat cushion frame from the rear of the seat. An example of a load applied to the rear side from the rear of the vehicle is a load generated when the luggage behind the seat moves forward and collides with the rear side during 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 weak portion, so that the displacement of the support member is prevented from being partially disengaged. Therefore, the seat itself does not excessively move forward, so that the occupant's chest and abdomen can be suppressed from being pressed by the seat belt, and the occupant's injury value can be reduced. Moreover, since the connecting portion of the brace can be displaced forward and upward of the vehicle, the luggage is not excessively displaced forward and upward. As a result, the amount of luggage loaded into the seat back is reduced, and excessive collision of luggage with the back of the occupant sitting on the seat can be suppressed, and the injury value of the occupant can be reduced.

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

  Embodiment 1 of the seat structure of the present invention will be described below with reference to FIGS. 1 to 3, and Modification 1 of the seat 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 >>
[Seat structure]
The seat structure 1 according to the first embodiment includes a brace that is interposed between a seat cushion frame 2 that forms a skeleton of a vehicle seat cushion (not shown), and the seat cushion frame 2 and a support member 4 located below the seat cushion frame 2. 3 and 3. The seat cushion frame 2 has a rear side portion 21 that extends in the vehicle width direction behind the vehicle. One of the features of the seat structure 1 is that the brace 3 is formed along the vehicle front-rear direction, and when a load is applied to the rear side portion 21 from the rear of the vehicle, the brace 3 promotes a specific displacement and suppresses the specific displacement. The point is that the part 33 is provided. Hereinafter, each configuration of the seat structure 1 will be described in detail by taking a rear seat provided with a luggage compartment at the rear as an example. In this example, the load applied to the rear portion 21 from the rear of the vehicle includes the load generated when the luggage P in the luggage compartment moves forward and collides with the rear portion 21 during a frontal collision or sudden braking. (Figure 3). Although the left and right seats are separate seats in FIG. 1, the left and right seats may be integrated bench seats. In FIG. 3, for convenience of description, the bolt 70 and the nut 71 are shown not on the cross section but on the side surface thereof.

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

  The seat cushion frame 2 of the present example is formed in a rectangular frame shape, and has a rear side portion 21 extending in the vehicle width direction behind the vehicle, a front side portion 22 parallel to the rear side portion 21 in front of the vehicle, and a rear side. It has a left side portion 23 and a right side portion 24 that connect both ends of the portion 21 and the front side portion 22. 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. In the present example, the rear side portion 21 is composed of an ISO-FIX bar for fixing the child seat to the seat, but it may be composed of a seat cross member having a skeleton different from the ISO-FIX bar. By configuring the rear side portion 21 with the ISO-FIX bar as in this example, the rear side portion 21 is not excessively deformed even when a load acts on the rear side portion 21 from the rear of the vehicle. This is because the ISO-FIX bar has extremely high rigidity. A mounting bracket 25 for fixing the rear side portion 21 to the brace 3 is fixed to the rear side portion 21. The cross-sectional shape of the mounting bracket 25 is a [] (bracket) shape, and the opening thereof faces upward and is fixed below the rear side portion 21 so as to fit a part of the rear side portion 21. In FIG. 3, the mounting bracket is omitted for convenience of 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 vehicle front-rear direction. The position where the brace 3 is arranged along the vehicle width direction is a position corresponding to the position of the support member 4, and in this example, it is a position near the center of the rear side portion 21 in the vehicle width direction (FIG. 1). The brace 3 is composed of a hollow cylindrical body. The outer shape of the brace 3 as viewed in the vehicle width direction 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 a lower piece 30D each having a [] shape (bracket). Specifically, the opening sides of the upper piece 30U and the lower piece 30D are opposed to each other and both side surfaces are overlapped and joined. Examples of the material of the upper piece 30U and the lower piece 30D (braces 3) include metals such as steel. The upper piece 30U and the lower piece 30D may be joined by welding. The brace 3 may not be formed by joining two members, but may be formed of a hollow cylindrical body of an integrally molded product. The brace 3 includes a connecting portion 31, a fixing portion 32, and a fragile portion 33.

(Connecting part / fixing part)
The connecting portion 31 is connected to the rear side portion 21. The connecting portion 31 is a portion on the rear side of the brace 3, and is formed so as to extend forward and downward from the rear side portion 21 (mounting bracket 25) so as to intersect the support member 4. The fixed 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 upper surfaces of the connecting portion 31 and the fixed portion 32 of the brace 3.

  On the lower surface of the fixed portion 32 (the lower surface of the lower piece 30D), a plurality of (two in this example, front and rear) insertion holes (not shown) through which the bolts 70 are inserted are formed (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 fixing portion 32 to project upward, and is tightened by the nut 71. The fixing portion 32 and the support member 4 are fixed by tightening the bolt 70 and the nut 71. In this example, the nut 71 is welded to the lower surface of the fixed portion 32.

(Fragile part)
The fragile portion 33 is a portion of the brace 3 that is locally configured to have low strength and is deformed by a load applied to the rear side portion 21 from the rear side of the vehicle (FIGS. 2 and 3). By this deformation, the connecting portion 31 is displaced upward and forward of the vehicle, and the displacement of the support member 4 is suppressed. Suppressing the displacement of the support member 4 means that the support member 4 (the seat upper rail 41 or the floor panel) is not displaced so as to be partially disengaged from the mating member (for example, the seat lower rail 51 or the base member of the floor panel). To tell.

  Examples of the fragile portion 33 include a portion having a locally small cross-sectional area that divides the brace 3 in the longitudinal direction. This cross-sectional area is a portion excluding the internal space when the brace 3 is a tubular body. When the brace 3 is a tubular body, the locally small cross-sectional area can be formed by providing a through hole or a notch on the component surface or by locally forming a thin portion on the component surface. When the through hole or the notch is provided, the fragile portion 33 can be formed near the through hole or the notch, and when the thin portion is provided, the fragile portion 33 can be formed in the thin portion. The through hole, the notch, and the thin portion are formed at least on the rear side of the bent portion 34, that is, the connecting portion 31. Then, the fragile portion 33 can be provided in the connecting portion 31 rearward of the bent portion 34, and the connecting portion 31 can be easily displaced forward and upward of the vehicle. It is advisable to adjust the formation location, shape, size, number, etc. of the through hole or notch, or adjust the formation location of the thin portion so that the fragile portion 33 is provided near the bent portion 34 of the connecting portion 31. The places where the through holes, the notches, and the thin portions are formed include the upper surface (the upper surface of the upper piece 30U) and the side surface (the side surface of the upper piece 30U) of the connecting portion 31. It is preferable that the through hole, the notch, and the thin portion are formed on the front side of the bent portion 34, that is, on the fixed portion 32, in addition to the connecting portion 31. When a through hole, a notch, or a thin portion is also formed in the fixing portion 32, its forming location may be a side surface (a side surface of the upper piece 30U or a side surface of the lower piece 30D) or a lower surface (lower surface of the lower piece 30D). The shapes of the through holes and the notches can be appropriately selected from polygonal shapes such as rectangular and triangular shapes, circular shapes, and elliptical shapes, and the size and number of the through holes and notches can be appropriately selected. When the brace 3 is a solid body such as a rod-shaped body, the fragile portion 33 can be formed by a portion having a small cross-sectional area formed locally in the longitudinal direction.

  The fragile portion 33 of this example is formed in the connecting portion 31 behind the bent portion 34 by providing the connecting-side through hole 331 and the two fixed-side through holes 332. A more specific location where the weakened portion 33 is formed is near the bent portion 34 of the connecting portion 31. The connecting-side through hole 331 is opened on the upper surface of the upper piece 30U in the connecting portion 31, and has a rectangular shape. The connection-side through hole 331 is provided behind the bent portion 34. Each fixed-side through hole 332 is opened from the middle of both side surfaces of the lower piece 30D in the fixing portion 32 to the middle of the lower surface of the lower piece 30D via the lower edge, and the shape thereof is L-shaped. Each fixed side through hole 332 is provided on the front side of the connecting side through hole 331. The front side here means that the front end of each fixed-side through hole 332 is in front of the front end of the connection-side through hole 331. That is, when the brace 3 is viewed from the side, the through holes 331 and 332 may partially overlap each other in the front-rear direction.

[Supporting member]
The fixing portion 32 of the brace 3 is fixed to the support member 4. Thereby, the seat cushion frame 2 is fixed to the support member 4 via the brace 3. The support member 4 can be appropriately selected according to the type of seat, and in the case of a slide seat that can slide back and forth as in this example, the seat upper rail 41 of the seat rail can be mentioned. In the case of a fixed seat that cannot be slid back and forth, a floor panel (not shown) can be used. The seat rail includes a pair of seat upper rails 41 arranged in parallel in the vehicle width direction along the front-rear direction of the seat cushion frame 2 and a pair of seat lower rails 51 to which the seat upper rails 41 are slidably mounted. Have. Each seat lower rail 51 is fixed to the floor panel along the front and rear 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 of the pair of seat upper rails 41 (FIG. 1). The seat upper rail 41 can be attached to the seat lower rail 51 after fixing the fixing portion 32 of the brace 3 and the seat upper rail 41.

[Brace behavior]
The behavior of the brace 3 when a load acts on the rear side portion 21 from the rear side of the vehicle will be described mainly with reference to FIG. 3 (as needed, FIG. 2). The white arrow in FIG. 2 indicates the load on the brace 3 when the load acts on the rear side portion 21 from the rear of the vehicle for convenience. In FIG. 3, the solid line indicates the state before the load is applied, and the part that is displaced after the load is applied is indicated by the two-dot chain line. The black arrow in FIG. 3 indicates the moving direction of the rear side portion 21 and the connecting portion 31 of the brace 3.

  When a frontal collision or sudden braking occurs, as shown in FIG. 3, when the luggage P in the luggage compartment behind the seat moves forward and collides with the rear side portion 21, a load from the vehicle rear side is applied to the rear side portion 21. To work. The load is transmitted from the rear side portion 21 to the brace 3, as shown by the white arrow in FIG. At this time, the load is received by the bent portion 34 between the connecting portion 31 and the fixed portion 32 while the load is transmitted from the connecting portion 31 to the fixed portion 32 side, and the stress is concentrated near both through holes 331, 332. .. When an excessive load is applied, the rear end of the connecting portion 31 rotates forward and upward as shown by the chain double-dashed line in FIG. 3, and the fragile portion 33 of the connecting portion 31 bends so as to project downward. .. On the other hand, when the fragile portion 33 is bent while receiving a load at the bent portion 34, it is possible to suppress an excessive load from acting on the fixed portion 32 in front of the bent portion 34, and to prevent the seat upper through the fixed portion 32. It is suppressed that an excessive load acts on the rail 41 (support member 4). As a result, excessive deformation of the fixing portion 32 is suppressed, and the seat upper rail 41 is prevented from being disengaged from the seat lower rail 51, and excessive displacement of the seat itself forward is suppressed.

[Action effect]
The seat structure 1 according to the first embodiment can reduce the injury value to the occupant sitting on the seat when a load acts on the rear side portion 21 of the seat cushion frame 2 from the rear of the seat. By providing both through holes 331 and 332, the fragile portion 33 provided in the connecting portion 31 behind the bending portion 34 can be bent below the upper surface of the fixing portion 32. Therefore, the rear side portion 21 and the rear end side of the connecting portion 31 can be displaced upward in the front of the vehicle. As a result, excessive displacement of the luggage P in the upper front direction can be suppressed, and the amount of the luggage P rushing into the seat back can be reduced. Therefore, the 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 both through holes 331 and 332, the bending portion 34 can receive the load when the luggage P collides with the rear side portion 21 from the rear side thereof. Therefore, due to the bending of the fragile portion 33, it is possible to prevent an excessive load from acting on the fixed portion 32 in front of the bent portion 34, and it is possible to suppress excessive deformation of the fixed portion 32. As a result, it is possible to prevent an excessive load from acting on the seat upper rail 41 to which the fixing portion 32 is fixed, and to prevent the seat upper rail 41 from coming off the seat lower rail 51. Therefore, it is possible to suppress an excessive forward displacement of the seat itself, suppress the compression of the occupant's chest and abdomen by the seat belt, and reduce the injury value of the occupant. Further, since the brace 3 is provided with the plurality of through holes 331 and 332 for forming the fragile portion 33, the weight of the brace 3 and the weight of the seat structure 1 can be reduced.

<Modification 1>
The seat structure 1 according to the first modification differs from the seat structure 1 according to the first embodiment in that the fragile portion 33 of the brace 3 is formed by providing the connecting-side through hole 331 and the fixed-side through hole 332. Although the same, the positions, shapes, numbers, etc. of the connecting-side through holes 331 and the fixed-side through holes 332 that form the fragile portion 33 are different from those in the first embodiment. The following description will be focused on the differences, and the description of similar configurations will be omitted. FIG. 4 shows a state in which the brace 3 is viewed from the side, and like FIG. 3, the mounting bracket is omitted for convenience of description.

[Brace]
(Fragile part)
The fragile portion 33 does not open to the upper surface of the upper piece 30U in the connecting portion 31, but the connecting side through hole 331 that opens to the side surface of the upper piece 30U, and both side surfaces of the upper piece 30U and the lower piece 30D in the fixing portion 32. By providing the fixed-side through hole 332 that is open on both side surfaces, the fixed-side through hole 332 is formed in the connecting portion 31 behind the bent portion 34. A more specific location where the weakened portion 33 is formed is near the bent portion 34 of the connecting portion 31. The connection-side through hole 331 and each fixed-side through hole 332 have a triangular shape. The connection side through hole 331 is provided behind the bent portion 34, and each fixed side through hole 332 is provided ahead of the connection side through hole 331. The fixed-side through hole 332 on the side surface of the upper piece 30U and the fixed-side through hole 332 on the side surface of the lower piece 30D are located at substantially the same position in the front-rear direction.

  In the seat structure 1 according to the modified example 1, similarly to 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, and the rear end side of the connecting portion 31 is moved forward. It can be rotated upward. Moreover, it is possible to prevent the seat upper rail 41 from coming off the seat lower rail 51. Therefore, it is possible to suppress the excessive collision of the luggage P with the back of the occupant sitting on the seat, and it is possible to suppress the occupant's chest and abdomen from being pressed by the seat belt, so that the injury value of the occupant can be reduced.

  The present invention is not limited to these examples, but is defined by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope. For example, the seat structure is not limited to the rear seat, and may be included in the front seat provided in front of the vehicle. In that case, the load from the rear of the vehicle on the rear side means that the 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 frontal collision or sudden braking. The load caused by is mentioned.

1 Seat structure 2 Seat cushion frame 21 Rear side 22 Front side 23 Left side 24 Right side 25 Mounting bracket 3 Braces 30U Upper piece 30D Lower piece 31 Connecting part 32 Fixing part 33 Weak part 331 Connecting side through hole 332 Fixed side penetration Hole 34 Bent portion 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 skeleton of a vehicle seat cushion and that has a rear side portion that extends in the vehicle width direction behind the vehicle;
A brace that is formed along the vehicle front-rear direction and that is interposed between the seat cushion frame and a support member located below the seat cushion frame;
The brace is
A connecting portion connected to the rear side portion,
A fixed portion fixed to the support member,
A bent portion provided between the upper surfaces of the connecting portion and the fixed portion,
It is fragile that is locally configured to have low strength and is deformed so as to be bent by a load applied to the rear side portion from the rear side of the vehicle, thereby displacing the connecting portion upward and forward of the vehicle and suppressing displacement of the support member. have a part and,
The fragile part is
A first fragile portion provided in the connecting portion,
To have a a second fragile portion provided in the fixing portion so as to straddle the bent portion back and forth,
Seat structure.

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