JP4973185B2 - Seat rail mounting structure - Google Patents

Description

  The present invention relates to a seat rail mounting structure for slidably supporting a seat in a vehicle longitudinal direction.

  The seat provided in the passenger compartment is slidably supported by a seat rail extending in the vehicle front-rear direction so that the position in the front-rear direction can be adjusted. Many of the seat rails are fixed by welding to the inner panel constituting the vehicle body via a bracket or by bolts or the like in order to ensure the mounting rigidity with the vehicle body. Since such a seat rail extends in the longitudinal direction of the vehicle body, it does not deform depending on the strength of the rail itself or the mounting strength when it is collided from the rear of the vehicle, and hinders shock absorption due to deformation of the vehicle body. There is.

  Therefore, Patent Document 1 proposes a configuration in which, when a seat rail is fixed to a vehicle body via a bracket, the seat rail moves relative to the bracket when a predetermined collision load or more is applied.

JP 2001-39193 A

  In recent years, in order to improve the comfort in the passenger compartment, the sliding amount of the seat tends to be increased, and the overall length of the rail is also increased accordingly. For this reason, if the seat rail moves away from the bracket due to a collision load of a predetermined value or more as in Patent Document 1, it may become a factor of hitting an occupant. In particular, when the rail is stored in the interior (inner trim), depending on the amount of movement of the rail, it may be possible to break through the inner trim and jump out into the room. When the vehicle body and the bracket fixing part and the bracket and rail mounting part are located on the same line as in Patent Document 1, when the collision load is input from the rear of the vehicle, the bracket is deformed by the collision load. Is pushed forward, which facilitates the forward movement of the seat rail.

  It is an object of the present invention to provide a seat rail mounting structure that can absorb an impact load without inhibiting the deformation of a vehicle body while suppressing the movement of the seat rail toward the front of the vehicle even when a collision load is applied from the rear of the vehicle. And its purpose.

In order to achieve the above object, the invention according to claim 1 is a seat rail mounting structure in which a plurality of seat rails extending in the vehicle longitudinal direction and slidably supporting a seat are fixed to the vehicle body. The rear end is fixed to the vehicle body via the bracket, and the fixing portion between the bracket and the vehicle body and the mounting portion between the bracket and the rear end of the seat rail are arranged so as to be offset in the vehicle width direction. The fixed part is offset inward in the vehicle width direction from the mounting part, and the bracket is U-shaped in cross section, with the side surface connecting the upper and lower surfaces facing each other and the open side of the opposite side facing the vehicle interior side The rear end of the seat rail is joined to the rear end of the seat rail so as to include the rear end .

According to a second aspect of the present invention, there is provided a seat rail mounting structure in which a plurality of seat rails that extend in the vehicle front-rear direction and slidably support a seat are fixed to a vehicle body. And the mounting portion between the bracket and the vehicle body and the mounting portion between the bracket and the rear end of the seat rail are arranged so as to be offset in the vehicle width direction. The bracket is offset inward in the width direction, and the bracket has a U-shaped cross section, the side surface connecting the upper and lower surfaces facing each other and the open side of the opposite side facing the vehicle interior, and the rear end of the seat rail facing the vehicle width It is characterized by being joined to the rear end of the seat rail so as to cover from the outside in the direction .

  According to a third aspect of the present invention, in the seat rail mounting structure according to the first or second aspect, the bracket is formed so that the width in the vehicle width direction on the fixed portion side is smaller than that on the mounting portion side.

  According to the present invention, the rear end of the seat rail is fixed to the vehicle body via the bracket, and the fixing portion between the bracket and the vehicle body and the mounting portion between the bracket and the rear end of the seat rail are offset in the vehicle width direction. When a collision load is input from the rear of the vehicle, the mounting rigidity of the rail is secured at a fixed portion other than the bracket, and the bracket is deformed by the collision load, so that the movement of the seat rail to the front of the vehicle is suppressed. The impact load can be absorbed without hindering the deformation of the vehicle body.

  According to the present invention, the bracket has a U-shaped cross section, and since the open side of the cross section is directed to the vehicle interior side and joined to the rear end of the seat rail, when a collision load is input from the rear of the vehicle, Since the bracket is deformed toward the vehicle interior side, the rear end of the seat rail is not pushed at the deformed portion, and the movement of the seat rail toward the front of the vehicle can be further suppressed.

  According to the present invention, since the bracket is formed so that the cross-sectional shape on the fixed end side with respect to the vehicle body is smaller than the mounting end side with respect to the seat rail, the section coefficient between the vehicle body and the fixed end side in the bracket is small. It becomes a weak part, can deform | transform a bracket from the fixed end side, and can suppress the movement to the vehicle front of a seat rail more.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, seats 1 and 2 are disposed in the vehicle interior space. The seats 1 and 2 in this embodiment are rear seats, and can be stowed up and stored in the vehicle width direction W with the seat backs 1A and 2A tilted toward the seat cushions 1B and 2B. The seats 1 and 2 are slidably supported in the vehicle longitudinal direction FR by a plurality of seat rails 3, 4, 5 and 6 extending in the vehicle longitudinal direction indicated by arrows F and R.

The seat rails 3 and 4 are used for the seat 1, and the seat rails 5 and 6 are used for the seat 2. The seat rails 4 and 6 are mounted on the floor 7 constituting the vehicle body, and the seat rails 3 and 5 are arranged on the side panels 8 and 9 constituting the vehicle body.
(First embodiment)
The seat rail mounting structure according to this embodiment is applied to the seat rails 3 and 5. Since the structure applied to each rail member is the same structure, the mounting structure of the seat rail 3 will be described as a representative. As shown in FIG. 1, the seat rail 3 is formed with fixing portions 10A and 10B at the front end 3A and the central portion 3B, and the fixing portions 10A and 10B and the side panel 8 are fastened by bolts and nuts (not shown). By doing so, it is firmly fixed to the side panel 8. A rear end 3 </ b> C of the seat rail 3 is fixed to an inner panel 11 of a rear pillar constituting the vehicle body via a bracket 12. In FIG. 1, reference numerals 13 </ b> A to 13 </ b> C are attachment portions for mounting the inner trim 14, and these are fixed to the seat rail 3.

  The bracket 12 is made of sheet metal, and has a U-shaped cross section as shown in FIG. A rear end 3 </ b> C of the seat rail is fixed to the inside of the front end 12 </ b> A of the bracket 12 by welding. The rear end 12B of the bracket 12 is fixed to the inner panel 11 with bolts and nuts.

  The bracket 12 has a crank shape in plan view from the front end 12A to the rear end 12B, a fixing portion A1 between the rear end 12B and the inner panel 11, and an attachment portion A2 between the front end 12A and the seat rail rear end 3C. However, it is formed so as to be offset by a width W1 in the vehicle width direction W. The width W1 serving as the offset amount may be appropriately changed according to the structure of the vehicle body. The bracket 12 is formed to have a smaller cross-sectional shape on the rear end 12B side serving as a fixed end with respect to the inner panel 11 than on the front end 12A side serving as a mounting end with the seat rail rear end 3C.

  According to the seat rail mounting structure having such a configuration, when a collision load P is input from the vehicle rear side R, the inner panel 11 is deformed. At this time, the mounting rigidity of the seat rail 3 is the fixed portion 10A other than the bracket 12. 10B, and the bracket 12 is deformed by the collision load, so the collision load P is absorbed. For this reason, the movement of the seat rail 3 toward the vehicle front F is suppressed, and the bracket 12 is deformed, so that the collision load can be absorbed without inhibiting the deformation of the vehicle body. Further, the fixed portion A1 and the attachment portion A2 are offset in the vehicle width direction W. For example, when a bracket is attached below the rear end of the seat rail as in the conventional case (offset in the vehicle vertical direction) and a collision load is input from a position below the bracket, the seat rail exists in the bracket displacement direction. Although the seat rail is pushed by the deformed bracket itself, by offsetting in the vehicle width direction, the rear end 3C of the seat rail is not pushed by the deformed bracket 12 as in the prior art, and the seat rail 3 is more forward of the vehicle. The movement to F can be suppressed.

  Since the bracket 12 is formed to have a smaller cross-sectional shape on the rear end 12B side serving as the fixed end side with the inner panel 11 than on the front end 12A side serving as the mounting end with the seat rail rear end 3C, the rear end 12 side Thus, the section modulus becomes smaller and becomes a fragile portion, the bracket 12 can be deformed from the rear end 12B side, and the movement of the seat rail 3 toward the vehicle front F can be further suppressed.

Thus, by fixing the rear end 3C of the seat rail 3 located on the collision side from the rear to the inner panel 11 with the bracket 12, the strength on the side of the rear end 3C of the seat rail is weakened by the bracket 12 and is easily deformed. Thus, suppressing the movement of the seat rail 3 toward the front F of the vehicle leads to prevention of the seat rail 3 from breaking through the inner trim 14 and jumping out to the indoor side, which is preferable from the viewpoint of passenger protection. Become.
(Second Embodiment)
FIG. 4 shows a second embodiment of the present invention. Since this embodiment has the same configuration as that of the first embodiment except for the configuration of the bracket, the configuration of the bracket will be mainly described.

  The bracket 22 according to this embodiment is made of sheet metal, and as shown in FIG. 5, the cross section has a U shape, and is joined to the rear end 3 </ b> C of the seat rail 3 with the open side of the cross section directed toward the vehicle interior side. ing. The seat rail rear end 3C is fixed to the inner side of the front end 22A of the bracket 22 by welding, and the rear end 22B of the bracket 22 is fixed to the inner panel 11 with bolts and nuts.

  The bracket 22 has a crank shape in plan view from the front end 22A to the rear end 22B, and includes a fixing portion A3 between the rear end 22B and the inner panel 11, and an attachment portion A4 between the front end 22A and the seat rail rear end 3C. The vehicle width direction W is offset by a width W1. The overall length of the bracket 22 in the vehicle front-rear direction is longer than the bracket 12. The bracket 22 is formed so that a cross-sectional shape on the rear end 22B side serving as a fixed end with respect to the inner panel 11 is smaller than the front end 22A side serving as a mounting end with the seat rail rear end 3C.

  According to the seat rail mounting structure having such a configuration, when a collision load P is input from the vehicle rear R, when the inner panel 11 is deformed, the mounting rigidity of the seat rail 3 is fixed to the fixing portions 10A and 10B other than the bracket 22. Since the bracket 22 is deformed by a collision load, the collision load P is absorbed. For this reason, the movement of the seat rail 3 toward the front F of the vehicle is suppressed, and the bracket 22 is deformed, so that the impact load can be absorbed without hindering the deformation of the vehicle body. Further, since the fixing portion A3 and the mounting portion A4 are offset in the vehicle width direction W, the bracket 22 is not deformed so as to be crushed in the longitudinal direction, but is deformed so as to be bent inwardly as shown in FIG. Therefore, the rear end 3 </ b> C of the seat rail is not pushed as in the conventional case by the deformed bracket 22, and the movement of the seat rail 3 toward the vehicle front F can be further suppressed.

  The bracket 22 is formed to have a smaller cross-sectional shape on the rear end 22B side serving as a fixed end side with the inner panel 11 than on the front end 22A side serving as a mounting end with the seat rail rear end 3C. Since it faces the indoor side and its overall length is also long, the section coefficient on the rear end 22 side becomes small and becomes a fragile portion, so that the bracket 22 can be deformed from the rear end 22B side, and the cross section is deformed to open. For this reason, it is easier to deform than the bracket 12, and the collision load can be absorbed more efficiently without hindering deformation of the vehicle body.

  Thus, by fixing the rear end 3C of the seat rail 3 located on the collision side from the rear to the inner panel 11 with the bracket 22, the strength on the rear side 3C side of the seat rail is weakened by the bracket 22 and is easily deformed. Thus, suppressing the movement of the seat rail 3 toward the front F of the vehicle leads to the prevention of the seat rail 3 from breaking through the inner trim 14 and jumping out to the indoor side. This is preferable.

It is the side view which looked at the seat rail attachment structure concerning the 1st Embodiment of this invention from the vehicle interior. It is a perspective view showing the relation between a seat rail to which a seat rail mounting structure is applied and a seat. It is a partial expansion perspective view which shows the structure of the bracket vicinity in 1st Embodiment. It is the side view which looked at the seat rail attachment structure concerning the 2nd Embodiment of this invention from the vehicle interior. It is a partial expansion perspective view which shows the structure of the bracket vicinity in 2nd Embodiment. It is a side view which shows the deformation | transformation state of the bracket vicinity in 2nd Embodiment.

Explanation of symbols

1, 2 Seat 3, 5 Seat rail 3C, 5C Rear end of seat rail 11 Inner panel (vehicle side)
12, 22 Brackets 12A, 22A Seat rail mounting ends 12B, 22B Car body fixed ends A1, A3 Fixed portions A2, A4 Mounting portions F, R Vehicle longitudinal direction W Vehicle width direction

Claims (3)

In the seat rail mounting structure in which a plurality of seat rails that extend toward the vehicle longitudinal direction and support the seat slidably are fixed to the vehicle body,
The rear end of the seat rail is fixed to the vehicle body via a bracket, and the fixing portion between the bracket and the vehicle body and the mounting portion between the bracket and the rear end of the seat rail are offset in the vehicle width direction. Arranged to
The fixed portion is offset inward in the vehicle width direction from the mounting portion,
The bracket is U-shaped in cross-section, and the side surface connecting the upper surface and the lower surface facing each other and the open side of the opposite side are directed to the vehicle interior side, and the rear end of the seat rail is included. A seat rail mounting structure characterized by being joined to a rear end . In the seat rail mounting structure in which a plurality of seat rails that extend toward the vehicle longitudinal direction and support the seat slidably are fixed to the vehicle body,
The rear end of the seat rail is fixed to the vehicle body via a bracket, and the fixing portion between the bracket and the vehicle body and the mounting portion between the bracket and the rear end of the seat rail are offset in the vehicle width direction. Arranged to
The fixed portion is offset inward in the vehicle width direction from the mounting portion,
The bracket has a U-shaped cross section, and the side surface connecting the upper surface and the lower surface facing each other and the open side of the opposite side are directed to the vehicle interior side, and the rear end of the seat rail is covered from the outside in the vehicle width direction. A seat rail mounting structure characterized by being joined to the rear end of the seat rail .   3. The seat rail mounting structure according to claim 1, wherein the bracket is formed so that a width in a vehicle width direction on the fixed portion side is smaller than that on the mounting portion side.

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