JP6016056B2 - Vehicle seat rail mounting structure - Google Patents

Description

  The present invention relates to a seat slider mounting structure for a vehicle.

  Patent Document 1 describes a structure in which a seat cushion frame of a front seat of an automobile is supported on a floor panel so as to be movable back and forth via left and right seat rails. Each seat rail includes a lower fixed rail fixed to the floor panel, and a movable rail fixed to the seat cushion frame and slidably fitted into the fixed rail via a slider. A front bracket and a rear bracket are provided at the front end and the rear end of the fixed rail, respectively. The front bracket is fastened to the cross member of the floor panel with bolts, and the rear bracket is fastened to the floor panel with bolts.

JP 2009-119983 A

  As in Patent Document 1, a front rail that supports a seat from below extends in the front-rear direction of the seat above the upper surface (rail facing surface portion) of the cross member, and extends downward from the front end portion (one end portion) of the seat rail. When the seat leg bracket is fixed to the standing surface (rail fixing surface) of the cross member, the seat leg bracket cannot be fixed to the rail fixing surface immediately below the seat rail due to layout restrictions. Therefore, it is necessary to separate (offset) the fastening position (leg fastening position) of the seat leg bracket with respect to the rail fixing surface portion in the seat width direction from the seat rail.

  On the other hand, when a load acts on the seat back frame standing up from the seat rear end portion of the seat cushion frame in the rear collision of the vehicle, if a load acts on the seat rail from the rear of the seat, an upward load acts on the front end portion of the seat rail. To do. At this time, if the leg fastening position is separated from the seat rail in the seat width direction, a moment is generated in the seat leg bracket, and there is a possibility that the seat leg bracket rotates around the leg fastening position. When the seat leg bracket rotates, the front end of the seat rail is lifted, the entire seat tilts, and the rear tilt angle of the seat back increases. For example, in the case of a collision at high speed, if the increase in the rearward tilt angle of the seat back becomes excessive, the occupant cannot be restrained by the seat belt or the seat itself, and the occupant is released from the vehicle, There is a possibility of causing a secondary collision with in-vehicle components. In the case of a collision during low-speed driving, if the back tilt angle of the seat back increases and the occupant's body is lifted, the headrest on the upper part of the seat back cannot support the occupant's head, causing a strong impact on the occupant's neck, etc. May be given.

  Therefore, an object of the present invention is to provide a vehicle seat rail mounting structure that can suppress an increase in the rearward tilt angle of the seat back at the time of a vehicle collision.

In order to achieve the above object, in the seat rail mounting structure of the present invention, the floor panel is provided with a rail facing surface portion and a rail fixing surface portion that bends downward from one edge in the seat front-rear direction of the rail facing surface portion. Above the rail facing surface is a seat rail that extends in the longitudinal direction of the seat and supports the end of the seat in the seat width direction from below. One end of the seat rail is attached to the floor panel via a seat leg bracket It is done. The rail facing surface portion and the rail fixing surface portion may be provided integrally with the floor panel, or may be provided separately and fixed to the floor panel.

The seat leg bracket includes a rail fixing portion, a leg fastening plate portion, and an overhanging upper plate portion. The rail fixing portion is fixed to the lower surface of one end portion of the seat rail. The leg fastening plate portion extends continuously from the rail fixing portion to the inside in the seat width direction, faces the rail fixing surface portion, and is fastened to the rail fixing surface portion from the seat front-rear direction at a leg fastening position separated from the seat rail in the seat width direction. Fixed. The overhanging upper plate portion continuously extends from the leg fastening plate portion to the inner side in the seat width direction, and approaches or contacts the rail facing surface portion from above.

In the above configuration, when a load acts from the seat occupant to the rear of the seat against the seat back frame that stands up from the seat rear end of the seat cushion frame at the time of a rear-end collision of the vehicle, Part) is subjected to an upward load. At this time, since the leg fastening position is separated from the seat rail in the seat width direction, a moment is generated in the seat leg bracket, and the seat leg bracket attempts to rotate around the leg fastening position. Since the overhanging upper plate portion is close to or in contact with the rail facing surface portion from the upper side on the opposite side of the rail fixing portion (inner side in the sheet width direction) , the sheet leg is brought into contact with the rail facing surface portion. The rotation of the bracket is restricted. Thereby, the increase in the back inclination angle of the seat back due to the lifting of the front end portion of the seat rail can be suppressed.

  In addition, since the overhanging upper plate portion extends from the leg fastening plate portion (leg fastening position) to the opposite side of the rail fixing portion, the load acting on the contact portion between the overhanging upper plate portion and the rail facing surface portion is reduced. It is possible to suppress the deformation without increasing the strength (rigidity) of both by increasing the thickness.

  According to the present invention, it is possible to suppress an increase in the rearward tilt angle of the seat back at the time of a vehicle collision.

It is the perspective view which looked at the sheet | seat attachment structure which concerns on one Embodiment of this invention from diagonally upward front. It is a front view of the seat mounting structure of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 3 is a side sectional view of FIG. 2.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the figure, FR indicates the front of the vehicle, UP indicates the upper side of the vehicle, and the occupant (seater) is seated in a state of facing the front of the vehicle. The seat longitudinal direction coincides with the vehicle longitudinal direction, and the seat width The direction coincides with the vehicle width direction. Moreover, the left and right in the following description means the left and right of the seated occupant.

  On the floor panel 40 in the passenger compartment, the vehicle seat 1 is arranged as shown in FIG. In the present embodiment, the front seat is described as an example. However, only the front seat may be disposed in the vehicle interior, or another seat such as a rear seat disposed at the rear of the vehicle interior may be used.

  The vehicle seat 1 generally includes a seat cushion 2 that supports a seated person's buttocks from below, and a seat back 20 that extends upward from the rear end of the seat cushion 2 and supports the seated person's back from behind.

The seat cushion 2 includes a cushion pad 4 that is covered with a skin material and has elasticity, and a cushion frame (seat cushion frame) 3 provided inside the cushion pad 4. The cushion frame 3 holds the shape of the seat cushion 2 (cushion pad 4). The cushion frame 3 has a front frame portion 8 and left and right side frame portions 9.

  The seat back 20 includes a seat back pad 21 covered with a skin material and having elasticity, and a seat back frame 22 provided inside the seat back pad 21. The seat back frame 22 stands from the seat rear end of the seat cushion frame 3 and maintains the shape of the seat back 20 (seat back pad 21). The lower end portion of the seat back frame 22 is rotatably supported by the rear end portion of the seat cushion frame 3, and the tilting position of the seat back 20 is fixed by a lock mechanism (not shown).

  The floor panel 40 integrally includes a floor main surface portion 41, a rail facing surface portion 42, and a rail fixing surface portion 43. The rail fixing surface portion 43 extends from one end edge (end edge in front of the seat) of the rail facing surface portion 42 in the front-rear direction of the seat so as to bend obliquely forward and downward. The floor main surface portion 41 is bent from the lower end edge of the rail fixing surface portion 43 and extends forward of the seat. The rail facing surface portion 42 and the rail fixing surface portion 43 may be provided separately from the floor panel 40 (floor main surface portion 41) and fixed to the floor main surface portion 41.

  As shown in FIGS. 1 to 4, a pair of left and right seat rails 30 that extend in the front-rear direction of the seat and support both sides in the seat width direction of the vehicle seat 1 from below are disposed above the rail facing surface portion 42. The Inside each seat rail 30, a slider 31 fixed to the lower part of the side frame portion 9 of the seat cushion frame 3 is slidably fitted, and the seat cushion 2 is slid in the seat longitudinal direction by the seat rail 30. It is supported freely. The front end and the rear end of each seat rail 30 are attached to the floor panel 40 via front brackets 32 and 50 and a rear bracket 33, respectively. The front bracket 32 on one side (left side) of the left and right front brackets 32 and 50 is fixed to the lower surface of the front end portion of the seat rail 30 and at the fastening position just below the seat rail 30 at the rail fixing surface portion 43. Are fastened and fixed by bolts 34 and nuts (not shown).

  A front bracket (seat leg bracket) 50 on the other side (right side) of the left and right front brackets 32 and 50 includes a rail fixing upper plate portion (rail fixing portion) 51, a rail side vertical plate portion 52, and an intermediate upper plate portion. 53, leg fastening plate portion 54, overhanging upper plate portion 55, and overhanging vertical plate portion 56 are integrally provided.

  The rail fixing upper plate portion 51 is fixed to the lower surface of the front end portion of the seat rail 30. The rail-side vertical plate portion 52 bends downward from the front end edge of the rail fixing upper plate portion 51 and faces the rail fixing surface portion 43. The intermediate upper plate portion 53 extends from the rail fixing upper plate portion 51 in the seat width direction. The leg fastening plate portion 54 is bent from the front end edge of the intermediate upper plate portion 53 and extends downward to face the rail fixing surface portion 43. The leg fastening plate portion 54 is fastened and fixed by a bolt 57 and a nut 58 at a leg fastening position separated from the seat rail 30 in the seat width direction while being in surface contact with the leg mounting surface portion 43. The bolt 57 is inserted through a bolt insertion hole 59 that penetrates the leg fastening plate portion 54 and the seat attachment surface portion 43, and the nut 58 is fixed to the back surface of the rail fixing surface portion 43 according to the bolt insertion hole 59.

The overhanging upper plate portion 55 extends in the seat width direction from the intermediate upper plate portion 53 toward the opposite side of the seat rail 30 (rail fixing upper plate portion 5 1 ), and approaches or contacts the rail facing surface portion 42. A portion of the intermediate upper plate portion 53 on the rail fixing upper plate portion 51 side is inclined obliquely downward so that the overhanging upper plate portion 55 approaches the rail facing surface portion 42. The overhanging vertical plate portion 56 extends downward from the front edge of the overhanging upper plate portion 55 and faces the rail fixing surface portion 43.

  The rail fixing upper plate portion 51, the intermediate upper plate portion 53, and the protruding upper plate portion 55 are opposed to the rail facing surface portion 42 and are continuous in the sheet width direction. The rail side vertical plate portion 52, the leg fastening plate portion 54, and the overhang side vertical plate portion 56 face the rail fixing surface portion 43 and are continuous in the seat width direction. That is, the leg fastening plate portion 54 extends continuously from the rail fixing upper plate portion 51 and faces the rail fixing surface portion 43, and the overhanging upper plate portion 55 continues from the leg fastening plate portion 54 to the seat rail 30. It extends to the opposite side and approaches or contacts the rail facing surface portion 42 from above.

Incidentally, as shown in FIG. 3, (the distance from the center of the sheet width direction of the seat rail 30 to the center of the bolt 57) the sheet width direction of the distance from the seat rail 30 to the leg fastening position, set at a predetermined distance L1 The distance in the sheet width direction from the leg fastening position to the tip of the overhanging upper plate portion 55 is set to a predetermined distance L2. Also, a two-dot chain line 60 in FIG. 3 indicates a general boundary between the intermediate upper plate portion 53 and the leg fastening plate portion 54, the overhanging upper plate portion 55, and the overhanging vertical plate portion 56. Further, thick lip portions for increasing rigidity are formed on the peripheral portion of the front bracket 32 and the peripheral portion of the front bracket 50, respectively.

  According to this embodiment, a load (indicated by an arrow 61 in FIG. 1) from the seated person to the seat back frame 22 standing from the seat rear end portion of the seat cushion frame 3 in the rear collision of the vehicle from the seated person. As a result, an upward load (indicated by an arrow 62 in FIGS. 1 and 3) acts on the front end portion of the seat rail 30. At this time, since the leg fastening position is separated from the seat rail 30 in the seat width direction, a moment is generated in the front bracket 50, and the front bracket 50 rotates in the direction of arrow 63 in FIG. 3 around the leg fastening position. However, since the overhanging upper plate portion 55 is close to or in contact with the rail facing surface portion 42 on the opposite side of the rail fixing upper plate portion 51 with respect to the leg fastening position, the overhanging upper plate portion 55 is connected to the rail. The rotation of the front bracket 50 is restricted by contacting the facing surface portion 42. Thereby, the increase (falling) of the rearward tilt angle of the seat back 20 due to the lifting of the front end portion of the seat rail 30 can be suppressed. Therefore, for example, in a collision during high-speed traveling, the restraint of the occupant by the seat belt (not shown) and the seat 1 itself is maintained, so that the occupant is released to the outside of the vehicle and the secondary collision with the rear seat occupant and in-vehicle components. Can be prevented. Further, in a collision during low-speed traveling, lifting of the occupant's body is suppressed, and the support of the occupant's head by the headrest on the upper portion of the seat back 20 is maintained, so that the impact received by the occupant's neck and the like can be reduced. .

  Further, since the overhanging upper plate portion 55 extends from the leg fastening plate portion 54 (leg fastening position) to the opposite side of the rail fixing upper plate portion 51, the overhanging upper plate portion 55 and the rail facing surface portion 42 come into contact with each other. The load acting on the portion can be reduced, and deformation can be suppressed without increasing the strength (rigidity) of both parts by increasing the thickness.

  Further, the front bracket 50 includes a rail fixing upper plate portion 51, a rail side vertical plate portion 52, an intermediate upper plate portion 53, a leg fastening plate portion 54, an overhang upper plate portion 55, and an overhang side vertical plate portion 56. Since it has it integrally, the front bracket 50 can be made into a shape that is highly rigid and difficult to deform.

  As described above, the present invention has been described based on the above embodiment, but the present invention is not limited to the content of the above embodiment, and can be appropriately changed without departing from the present invention. is there.

1: Vehicle seat 2: Seat cushion 3: Cushion frame 4: Cushion pad 8: Front frame portion 9: Side frame portion 20: Seat back 22: Seat back frame 30: Seat rail 31: Slider 40: Floor panel 41: Floor Main surface portion 42: Rail facing surface portion 43: Rail fixing surface portion 50: Front bracket (seat leg bracket)
51: Rail fixing upper plate part (rail fixing part)
52: Rail side vertical plate portion 53: Intermediate upper plate portion 54: Leg fastening plate portion 55: Overhang upper plate portion 56: Overhang side vertical plate portion

Claims (1)

The floor panel is provided with a rail facing surface portion and a rail fixing surface portion that bends downward from one edge of the rail facing surface portion in the seat front-rear direction, and extends in the seat front-rear direction above the rail facing surface portion. A seat rail mounting structure for disposing a seat rail that supports an end in the width direction from below, and attaching one end of the seat rail to the floor panel via a seat leg bracket,
The seat leg bracket is
A rail fixing portion fixed to the lower surface of the one end of the seat rail;
The rail fixing portion is fastened and fixed to the rail fixing surface portion from the front-rear direction of the seat at a leg fastening position that extends continuously inward in the seat width direction from the rail fixing portion, faces the rail fixing surface portion, and is separated from the seat rail in the seat width direction. Leg fastening plate part,
An overhanging upper plate portion that extends continuously from the leg fastening plate portion inward in the seat width direction and that approaches or contacts the rail facing surface portion from above.

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