JP4396566B2 - Structure of vehicle seat support - Google Patents

Description

  The present invention relates to a structure of a vehicle seat support portion applied to a vehicle such as an automobile.

In a structure that supports the seat to be slidable in the longitudinal direction of the vehicle body via the slide rail, a technology for fixing the seat leg provided at the rear end of the lower rail, which is a part of the slide rail to the vehicle body fixing side, to the cross member via the bracket Is known (see, for example, Patent Document 1). In addition, a technique is known in which the front and rear ends of the slide rail are fixed to different cross members, and the slide rail performs the function of a frame (see, for example, Patent Document 2).
JP 2004-168235 A JP 2003-118649 A

  However, in the structure of the conventional vehicle seat support portion as described above, the end of the slide rail is simply fixed to the cross member. Therefore, in order to improve the rigidity of the cross member with respect to the load input from the seat rail. It was necessary to reinforce each cross member.

  An object of the present invention is to obtain a structure of a vehicle seat support portion capable of effectively supporting a load from a seat with a cross member in consideration of the above facts.

  In order to achieve the above object, the structure of the vehicle seat support portion according to the first aspect of the present invention includes a first cross member to which a rear portion of a seat rail for a front seat is fixed, and the first cross member. And a second cross member that is disposed rearward and supports the rear portion of the rear seat, and a connecting member that connects the first cross member and the second cross member.

  In the structure of the vehicle seat support portion according to claim 1, for example, when a load is input from the front seat to the first cross member at the time of front collision or rear collision of the vehicle, a part of the load is passed through the connecting member. Is transmitted to the second cross member. On the other hand, for example, when a load is input from the rear seat to the second cross member at the time of frontal collision or rearward collision of the vehicle, a part of this load is transmitted to the first cross member via the connecting member. That is, in a vehicle to which the present structure is applied, a load input from the seat to the vehicle body due to a vehicle collision is distributed to the first cross member and the second cross member. For this reason, the load to be supported by each cross member is relaxed, and it becomes possible to support the load from the seat without depending on the reinforcement.

  Thus, in the structure of the vehicle seat support portion according to the first aspect, the load from the seat can be effectively supported by the cross member.

  In order to achieve the above object, the structure of the vehicle seat support portion according to the second aspect of the present invention is related to the rear portion of the rear seat in the use state of the rear seat that can be used and stored. And a support member that supports the rear seat with respect to the vehicle body, and a rear end that is disposed along the vehicle front-rear direction so that the rear end extends to a position below the rear seat that is in the use state. A seat rail that is slidably supported, a first cross member to which a rear end portion of the seat rail is fixed, and a first rail that is disposed rearward of the first cross member and to which the support member is fixed. Two cross members, and a connecting member for connecting the first cross member and the second cross member.

  In the structure of the vehicle seat support portion according to claim 2, for example, when the rear seat is in use, the front seat is positioned forward of the rear end of the slide rail. In this state, when a front collision or rear collision occurs in the vehicle, an upward load is applied to the second cross member from the rear seat to lift the rear portion. Part of this load is transmitted to the first cross member via the connecting member. For this reason, the upward displacement of the second cross member (the rear portion of the rear seat supported by the second cross member) is suppressed without depending on the reinforcement of the second cross member.

  On the other hand, for example, in the retracted state of the rear seat, the slide position of the front seat can be adjusted to the rear side to the vicinity of the first cross member (rear movement limit). When a front collision or rear collision occurs in the state where the front seat is positioned in the vicinity of the rear movement limit in this way, an upward load is applied to the first cross member from the front seat which attempts to lift the rear portion. To do. Part of this load is transmitted to the second cross member via the connecting member. For this reason, the upward displacement of the first cross member (the rear portion of the rear seat supported by the first cross member) is suppressed without depending on the reinforcement of the first cross member.

  Thus, in the structure of the vehicle seat support portion according to the second aspect, the load from the seat can be effectively supported by the cross member in accordance with the use state of the seat.

  As described above, the structure of the vehicle seat support portion according to the present invention has an excellent effect that the load from the seat can be effectively supported by the cross member.

  A vehicle seat support structure 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. In addition, arrow FR, arrow UP, and arrow IN which are appropriately described in each figure are respectively the forward direction (traveling direction), the upward direction, the downward direction, and the vehicle of the vehicle body S to which the vehicle seat support structure 10 is applied. The inner side in the width direction is shown.

  FIG. 1 is a side sectional view showing a rear portion of a vehicle body S to which a vehicle seat support structure 10 is applied. As shown in the figure, on the floor 12 of the vehicle body S, a second row seat 14 as a front seat and a third row seat 16 as a rear seat are arranged side by side. The second row seats 14 are supported so that the front and rear positions can be adjusted by sliding in the front-rear direction with respect to the vehicle body S, and the third row seats 16 are stored in a storage recess 18 where the passenger can be seated. The storage state can be taken. This will be specifically described below.

  A long slide rail 20 that is elongated in the front-rear direction is fixed to the floor 12 of the vehicle body S. The structure for fixing the long slide rail 20 to the vehicle body S will be described later. As shown in FIG. 1, the long slide rail 20 slides the second row seat 14 with respect to the vehicle body S via a slide rail upper 22 provided at a lower portion of a seat cushion 14 </ b> A constituting the second row seat 14. The support is possible and can be stopped at a desired front-rear position. The long slide rail 20 is set to be long (about 3 times in this embodiment) with respect to the front and rear length of the seat cushion 14A, thereby realizing a configuration in which the range of the front and rear position of the adjustable second row seat 14 is wide. Yes.

  For this reason, the seat 14 in the second row incorporates a seat belt device 24. The seat belt device 24 includes a webbing belt 24A, one end of which is fixed to the rear end of the seat cushion 14A in the vehicle width direction, and a shoulder of the seat back 14B on the outer side in the vehicle width direction. Retractor 24B wound so as to be able to be pulled out while being urged in the direction, tongue plate 24C through which an intermediate portion of webbing belt 24A is slidably inserted, and a rear end portion on the outer side in the vehicle width direction of seat cushion 14A. A buckle device 24D capable of attaching and detaching the tongue plate 24C is provided. The seat belt device 24 is built in the second row seat 14 so that the occupant on which the second row seat 14 is seated can be reliably restrained regardless of the front-rear position of the second row seat 14.

  A storage recess 18 is formed between the rear end of the long slide rail 20 on the floor 12 and the rear bumper 25, which is a space that opens upward. The third row seats 16 each include a front leg 26 and a rear leg 28 whose upper ends are rotatably provided at the lower part of the seat cushion 16A. A front lock portion 26A is provided at the lower end portion of the front leg 26 so as to be detachably engaged with a front seat anchor 30 protruding from the floor 12. The lower end portion of the rear leg 28 protrudes from the floor 12. A rear lock portion 28 </ b> A that is detachably engaged with the rear seat anchor 32 is provided. Further, the other end of a guide arm 34 whose one end is pivotally supported by a front wall 18A of the storage recess 18 via a pin 36 is pivotally connected to the lower portion of the seat cushion 16A.

  The third row seat 16 is configured to be used by being supported by the guide arm 34 while the front lock portion 26A and the rear lock portion 28A are engaged with the front seat anchor 30 and the rear seat anchor 32, respectively. is there.

  In the third row of seats 16, the guide arm 34 rotates around the pin 36 in the direction of the arrow A with the front lock portion 26 </ b> A and the rear lock portion 28 </ b> A disengaged from the front seat anchor 30 and the rear seat anchor 32, respectively. When moved, the seat cushion 16A in which the front leg 26 and the rear leg 28 are housed is housed in the storage recess 18 as shown in FIG. Furthermore, when the seat back 16B is moved forward from this state, the third row seats 16 are arranged so that the back surface of the seat back 16B is substantially flush with the front side portion of the floor 12 relative to the storage recesses 18 as a whole. The storage state stored in is taken.

  In this embodiment, the use state and the storage state of the third row seat 16 are automatically performed according to the operation of the driver's hand switch by an electric storage mechanism (not shown).

  FIG. 3 is a plan view showing a schematic skeleton structure below the floor 12 at the rear portion of the vehicle body S. As shown in this figure, the vehicle body S includes a pair of left and right side members 38 that are elongated in the front-rear direction. Each side member 38 is partially tapered so that the interval between the side members 38 is wide at the rear portion where the storage recess 18 is disposed. The left and right side members 38 are connected (bridged) by a plurality of cross members that are each elongated in the vehicle width direction.

  In this embodiment, as shown in FIGS. 1 and 3, first to fifth cross members 40, 42, 44, 46, 48 are arranged in order from the front at the rear portion of the vehicle body S. The first to fourth cross members 40, 42, 44, and 46 are each formed in a hat shape that opens upward, and the flanges 40A, 42A, 44A, and 46A provided along the opening edge are fixed to the lower surface of the floor panel. By doing so, a closed section is formed. The fifth cross member 48 is formed in a substantially L shape in side view. The fifth cross member 48 has a flange 48A extending from the upper front end and the lower rear end fixed to a portion along the horizontal plane of the floor panel 50 and a portion constituting the front wall portion 18A of the storage recess 18 so as to have a closed cross section. It is composed.

  As shown in FIG. 3, the long slide rails 20 are provided in a pair of right and left for the second row seat 14 on the right side, and are provided in parallel on the left and right side in the second row seat 14. The long slide rail 20A on the outer side in the vehicle width direction indicated by an imaginary line in FIG. 3 is mainly disposed on the side member 38, and is fastened to a closed cross section formed by the side member 38 and the floor panel 50. Yes. The long slide rail 20 </ b> B on the inner side in the vehicle width direction extends from the rear portion of the first cross member 40 to the fourth cross member 46.

  The front end of the long slide rail 20B is fixed to a portion that forms a closed section with the first cross member 40 in the floor panel 50 via an attachment member (not shown). An intermediate portion of the long slide rail 20B is fastened and fixed to a portion of the floor panel 50 having a closed cross section with the second and third cross members 42 and 44 by bolts and nuts (weld nuts) (not shown).

  As shown in FIGS. 4 and 5, the rear end of the long slide rail 20B is connected to the weld nut 52 fixed to the lower surface of the portion of the floor panel 50 that forms the closed cross section with the fourth cross member 46. The bolt 54 penetrating the slide rail 20B is screwed to be fastened and fixed to the portion of the floor panel 50 (fourth cross member 46). As described above, each long slide rail 20B is firmly attached to the vehicle body S. As shown in FIG. 5, a fourth cross reinforcement 56 is disposed between the fourth cross member 46 and the floor panel 50.

  As shown in FIGS. 1 and 7, the front seat anchor 30 is fixed to a portion of the floor panel 50 that forms a closed section with the fourth cross member 46. Further, the rear seat anchor 32 is fixed to the upper part of the formation portion of the front wall portion 18 </ b> A in the floor panel 50 that forms a closed section with the fifth cross member 48. As shown in FIG. 6, each rear seat anchor 32 is fixed to the upper end of the front wall portion 18 </ b> A at the free end side of a bar-shaped member formed in a substantially U shape that opens downward, and the upper portion of the rear seat anchor 32 is fixed to the floor panel 50. It protrudes upward.

  In this embodiment, the third row seat 16 is a 6: 4 divided storage type, and the distance dr between the pair of rear seat anchors 32 for the right third row seat 16 is the left third row. The distance between the pair of rear seat anchors 32 for the seat 16 is greater than the distance dl. Although not shown, the front seat anchor 30 is also arranged in the same manner as the rear seat anchor 32. As shown in FIG. 7, in this embodiment, a reinforcement 58 that is fixed to the corner of the storage panel 18 and the floor 12 in the floor panel 50 and reinforces the reinforcement 58 is provided. Each rear seat anchor 32 is fixed.

  As shown in FIGS. 1 and 3, the structure 10 of the vehicle seat support portion is elongated in the front-rear direction and is a vertical member as a connecting member that connects the fourth cross member 46 and the fifth cross member 48. 60. As shown in FIGS. 4 and 6, the vertical members 60 are provided in a pair of left and right sides, each having a hat shape that opens upward. As shown in FIG. 4, each vertical member 60 is disposed between the long slide rail 20 </ b> B and the side member 38 in the vehicle width direction, and a flange 60 </ b> A extending from the opening edge is provided on the lower surface of the floor panel 50. By adhering, a closed cross-sectional structure is formed. Each vertical member 60 is disposed between the pair of rear seat anchors 32 for the left and right third row seats 16 as shown in FIG. 6 in the vehicle width direction. As shown in FIGS. 5 and 7, each bottom plate portion of the fifth cross member 48 and the vertical member 60 is provided with a weld nut 62 for attaching a component such as a fuel tank to the lower side of the floor 12. ing.

  In the above configuration, the fourth cross member corresponds to the “first cross member” in the present invention, and the fifth cross member 48 corresponds to the “second cross member” in the present invention. The rear seat anchor 32 corresponds to the “support member” in the present invention, and the long slide rail 20 corresponds to the “seat rail” in the present invention.

  Next, the operation of this embodiment will be described.

  In the automobile in which the vehicle seat support structure 10 having the above-described configuration is applied to the vehicle body S, the second row seat 14 is disposed relatively forward in the use state of the third row seat 16 as shown in FIG. . When an automobile reaches a frontal collision with an occupant seated on the third row seat 16 in use (with a seat belt not shown), a forward inertial force transmitted to the third row seat 16 via the seat belt. A moment (indicated by an arrow M1 in FIG. 1) acts to lift the rear part based on (indicated by an arrow F1 in FIG. 1). Due to this moment M1, as shown in FIGS. 6 and 7, an upward load (bending load) Fb1 acts on the fifth cross member 48 via the rear seat anchor 32.

  Here, since the vertical member 60 for connecting the fifth cross member 48 to the fourth cross member 46 is provided, a part of the load Fb1 acting on the fifth cross member 48 passes through the vertical member 60 to the fourth cross member 46. (See arrow B shown in FIG. 7). For this reason, the support load of the fifth cross member 48 is reduced, and the upward displacement of the fifth cross member 48 is suppressed.

  In addition, an automobile in which the vehicle seat support structure 10 having the above-described configuration is applied to the vehicle body S has the rear row movement limit of the second row seat 14 in the retracted state of the third row seat 16 as shown in FIG. It can be lowered to the vicinity. In this way, when the occupant is seated on the second row seat 14 whose front-rear position is adjusted to the vicinity of the rearward movement limit and the seat belt device 24 is mounted, a frontal collision occurs in the second row seat 14. A moment (indicated by an arrow M2 in FIG. 1) acts to lift the rear portion based on a forward inertial force (indicated by an arrow F2 in FIG. 2) transmitted through the webbing belt 24A of the seat belt device 24. Due to this moment M2, as shown in FIGS. 4 and 5, an upward load (bending load) Fb2 acts on the fourth cross member 48 via the long slide rail 20 and the bolt 54.

  Here, since the vertical member 60 that connects the fourth cross member 46 to the fifth cross member 48 is provided, a part of the load acting on the fourth cross member 46 is transferred to the fifth cross member 48 via the vertical member 60. Dispersed (see arrow C shown in FIG. 5). For this reason, the support load of the fourth cross member 46 is reduced, and the upward displacement of the fourth cross member 46 (displacement shown exaggerated by imaginary lines in FIG. 4) is suppressed.

  As described above, the fourth cross member 46 and the fifth cross member 48 connected by the vertical member 60 are reinforced to each other according to the position and state of the second row sheet 14 and the third row sheet 16. Since it functions as a member, the load from the 2nd row sheet | seat 14 and the 3rd row sheet | seat 16 can be supported, without depending on the reinforcement which each has independently. For this reason, in the vehicle body to which the vehicle seat support structure 10 is applied, the countermeasure weight is compared with the configuration in which the fourth cross member 46 and the fifth cross member 48 are independently reinforced to obtain equivalent performance. Becomes smaller and lighter.

  Thus, in the vehicle seat support structure 10 according to this embodiment, the load from the second row seat 14 or the third row seat 16 is effectively applied to the fourth cross member 46 and the fifth cross member 48. Can be supported.

1 is a side sectional view showing a vehicle body to which a structure of a vehicle seat support portion according to an embodiment of the present invention is applied. It is a sectional side view which shows the state different from FIG. 1 of the vehicle body to which the structure of the vehicle seat support part which concerns on embodiment of this invention was applied. 1 is a plan view schematically showing a skeleton structure of a vehicle body to which a structure of a vehicle seat support portion according to an embodiment of the present invention is applied. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a sectional side view which shows the state from which the vertical member which comprises the structure of the vehicle seat support part which concerns on embodiment of this invention distributes a load from a 4th cross member to a 5th cross member. FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. It is a sectional side view which shows the state from which the vertical member which comprises the structure of the vehicle seat support part which concerns on embodiment of this invention distributes a load from a 5th cross member to a 4th cross member.

Explanation of symbols

10 Structure of vehicle seat support portion 14 Second row seat (front seat)
16 3rd row seat (rear seat)
20 Long slide rail (seat rail)
32 Rear seat anchor (supporting member)
46 Fourth cross member (first cross member)
48 Fifth cross member (second cross member)
60 Vertical members (connected members)
S body

Claims (2)

A first cross member to which the rear portion of the seat rail for the front seat is fixed;
A second cross member disposed rearward of the first cross member and supporting a rear portion of the rear seat;
A connecting member for connecting the first cross member and the second cross member;
The structure of the vehicle seat support part provided with this. A support member that engages with a rear portion of the rear seat and supports the rear seat with respect to the vehicle body in the use state of the rear seat that can be in a use state and a retracted state;
A seat rail that is disposed along the vehicle front-rear direction so that the rear end reaches the lower side of the rear seat that takes the use state; and a front rail that slidably supports the front seat;
A first cross member to which a rear end portion of the seat rail is fixed;
A second cross member disposed behind the first cross member and to which the support member is fixed;
A connecting member for connecting the first cross member and the second cross member;
The structure of the vehicle seat support part provided with this.

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