JP2007326440A - Seat lower structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit side collision load to a floor at a vehicle width direction position closer to a collision portion when receiving a side face collision on a vehicle body side part on a side of a seat for a vehicle, and to earlier generate reaction from the floor in relation to the side collision load. <P>SOLUTION: A load transmitting member 18 opposed from the vehicle width direction inside to a leg part 32 at the vehicle width direction outside of leg parts 32 of the seat 12 for the vehicle is provided on a floor cross member 14 extended in the vehicle width direction of the floor 10 of the vehicle. When the side face collision occurs against the door 40 on the side of the seat 12, the side collision load can be transmitted from the leg part 32 to the floor cross member 14 via the load transmitting member 18. The side collision load therefore can be transmitted to the floor 10 at the vehicle width direction position closer to the collision portion and the reaction from the floor 10 in relation to the side collision load can be generated earlier. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat lower structure.

A reinforcing member is provided in the console box on the floor member located on the inner side in the vehicle width direction of the vehicle seat, and the side member load applied to the vehicle seat is applied to the reinforcing member by fixing the reinforcing member to the floor member. The structure which transmitted and disperse | distributed to a full floor via this reinforcement member is disclosed (refer patent document 1).
JP 2005-67427 A

  However, the above-described conventional example is configured to transmit the side impact load input to the vehicle body side portion on the side of the vehicle seat to the reinforcing member in the vehicle width direction central portion via the vehicle seat. It was difficult to transmit the side impact load to the floor at a position closer to the collision site.

  In consideration of the above facts, the present invention transmits a side impact load to the floor at a vehicle width direction position closer to the collision site when a side collision is received on the side of the vehicle body on the side of the vehicle seat. The purpose is to generate the reaction force from the floor to the load earlier.

  According to the first aspect of the present invention, there is provided a floor cross member extending in the vehicle width direction on the floor of the vehicle, and provided on the floor cross member, and the leg portion of the vehicle seat is located above the floor cross member above the vehicle. A seat bracket that is supported at a high position, and a load transmission member that is provided on the floor cross member and has a load receiving portion that faces the leg portion on the outer side in the vehicle width direction from the inner side in the vehicle width direction. It is a feature.

  In the vehicle seat lower structure according to claim 1, the load receiving portion of the load transmitting member provided on the floor cross member has a vehicle width with respect to a leg portion on the outer side in the vehicle width direction among the leg portions of the vehicle seat. Because it faces from the inside in the direction, when a side collision occurs on the side of the vehicle body on the side of the vehicle seat, the side impact load is transferred from the leg of the vehicle seat to the load receiving portion of the load transmission member. Can be transmitted, and further transmitted from the load transmitting member to the floor cross member. For this reason, the side collision load can be transmitted to the floor at a position in the vehicle width direction closer to the collision site, and the reaction force from the floor against the side collision load can be generated earlier.

  According to a second aspect of the present invention, in the vehicle seat lower structure according to the first aspect, the load receiving portion is provided with a restriction portion for restricting displacement of the leg portion in the vehicle vertical direction at the time of a side collision. It is characterized by that.

  In the vehicle seat lower structure according to claim 2, the load receiving portion of the load transmitting member is provided with a restricting portion that restricts the displacement of the leg portion in the vehicle vertical direction at the time of a side collision. It can transmit more efficiently from the leg part to the floor cross member via the load transmitting member.

  According to a third aspect of the present invention, in the vehicle seat lower structure according to the first or second aspect, the leg portion is supported by a seat rail fixed to the seat bracket so that the position in the vehicle front-rear direction can be adjusted. The load receiving portion is opposed to the seat rail from the inner side in the vehicle width direction.

  In the vehicle seat lower structure according to claim 3, the leg portion is configured to be able to adjust a vehicle longitudinal direction position by a seat rail fixed to the seat bracket, and the load receiving portion has a vehicle width with respect to the seat rail. Since it faces from the inside in the direction, the load transmission member provided on the floor cross member can be set to a lower height from the floor cross member to the load receiving portion, thereby making the load transmission member smaller The weight can be reduced, the moment acting on the standing portion of the load transmission member can be suppressed, and the load transmission efficiency from the seat rails having different installation heights to the floor cross member can be enhanced.

  As described above, according to the vehicle seat lower structure according to the first aspect of the present invention, when a vehicle body side portion on the side of the vehicle seat receives a side collision, the vehicle width direction is closer to the collision site. An excellent effect is obtained that the side impact load is transmitted to the floor at the position, and the reaction force from the floor against the side impact load can be generated earlier.

  According to the lower seat structure of the vehicle according to claim 2, an excellent effect is obtained that side impact load can be more efficiently transmitted from the leg portion to the floor cross member via the load transmitting member. .

  According to the vehicle seat lower structure according to claim 3, the load transmission member can be further reduced in size and weight, the moment acting on the standing portion of the load transmission member can be suppressed, and the installation heights are different from each other. An excellent effect is obtained that the load transmission efficiency from the seat rail to the floor cross member can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a vehicle seat lower structure S according to the present embodiment relates to a structure for transmitting a side collision load input to a vehicle body side portion from a vehicle seat 12 to a floor 10 in a side collision. The cross member 14, the seat bracket 16, and the load transmission member 18 are included.

  For example, the floor 10 reinforces the floor cross member 14 by extending it in the vehicle width direction on the upper surface of the floor panel 20 constituting the floor surface of the vehicle body, and the floor side member 22 on the lower surface of the floor panel 20. Reinforced in the front-rear direction. The end portions in the vehicle width direction of the floor cross member 14 and the floor panel 20 are joined to a rocker 24 extending in the vehicle front-rear direction at the lower portion of the vehicle body side portion. A tunnel portion 20A extending in the vehicle front-rear direction is formed at the center of the floor panel 20 in the vehicle width direction, and the inner end in the vehicle width direction of the floor cross member 14 is joined to the tunnel portion 20A. As shown in FIG. 2, for example, two floor cross members 14 are disposed below the vehicle seat 12 at one location, with appropriate separation in the vehicle front-rear direction.

  The vehicle seat 12 includes a seat cushion 26 on which an unillustrated occupant sits, a seat back 28 that supports the back of the occupant, and a headrest 30 provided corresponding to the head of the occupant. The seat cushion 26 is supported by leg portions 32 extending in the vehicle front-rear direction at the left and right lower portions of the seat cushion 26, and the leg portions 32 are supported by a seat rail 34 fixed to the seat bracket 16. The position is supported to be adjustable.

  The seat bracket 16 is provided on the floor cross member 14 and is a member that supports the leg portion 32 of the vehicle seat 12 or the seat rail 34 that supports the leg portion 32 at a higher position above the floor cross member 14 in the vehicle. It is. As shown in FIG. 2, the two front and rear floor cross members 14 are each provided with one seat bracket 16 corresponding to one seat rail 34. It is fixed on a pair of front and rear seat brackets 16.

  As shown in FIG. 3, the load transmission member 18 is a high-rigidity member provided on the floor cross member 14, and is a load receiving portion facing the leg portion 32 on the outer side in the vehicle width direction from the inner side in the vehicle width direction. 18A. Specifically, as shown in FIG. 2, a nut 36 is welded to the inner surface of the floor cross member 14, for example, and the base 18 </ b> B of the load transmission member 18 fastens the bolt 38 to the nut 36. The floor cross member 14 is fixed. The base 18B of the load transmitting member 18 is formed so as to follow the cross-sectional hat shape of the floor cross member 14, and the bolts 38 are fastened on the front surface 14A, the upper surface 14B, and the rear surface 14C. As shown in FIG. 3, the position of the bolt 38 corresponding to the front surface 14A is set on the outer side in the vehicle width direction than the position of the bolt 38 corresponding to the upper surface 14B. This is because when a side collision load is transmitted from the seat rail 34 to the load receiving portion 18A, a moment acts on the base portion 18B due to a difference in height between the load receiving portion 18A and the floor cross member 14. This is to increase the attachment strength of 18B.

  In FIG. 3, the load receiving portion 18 </ b> A is provided at the outer end portion in the vehicle width direction of the standing portion 18 </ b> C that is erected upward from the base portion 18 </ b> B, and faces the seat rail 34, for example, in proximity. . Of the standing portion 18C, a portion on the base portion 18B side spreads in a skirt shape in the vehicle width direction, thereby suppressing the deformation of the standing portion 18C at the time of side collision load transmission.

  As shown in FIG. 4, the load receiving portion 18 </ b> A may be provided with a restricting portion 18 </ b> D that restricts displacement of the seat rail 34 in the vehicle vertical direction at the time of a side collision. In the illustrated example, the restricting portion 18D protrudes outward in the vehicle width direction from the upper edge of the load receiving portion 18A so as to restrict the seat rail 34 from being displaced upwardly relative to the load transmitting member 18. Is formed. Although illustration is omitted, a restricting portion for restricting the seat rail 34 from being displaced downward relative to the load transmitting member 18 may be provided.

  In addition, as shown in FIG. 1, for example, a door 40 is provided on the vehicle body side portion of the vehicle seat 12 on the outer side in the vehicle width direction. The door 40 is configured by joining, for example, a door outer panel 42 on the outer side in the vehicle width direction and a door inner panel 44 on the inner side in the vehicle width direction, and a door trim 46 is disposed on the vehicle compartment side.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 5, when the opponent vehicle 48 collides with the vehicle door 40 having the vehicle seat lower structure S, the door 40 is deformed inward in the vehicle width direction, and the door trim 46 comes into contact with the vehicle seat 12. Thus, a side impact load is input from the door 40 to the vehicle seat 12.

  The seat rail 34 that supports the vehicle seat 12 is fixed by being raised to a position higher than the floor cross member 14 by the seat bracket 16, and is input to the vehicle seat 12 in the vehicle width direction by the input of a side collision load. Try to displace. However, as shown in FIG. 6, in the vehicle seat lower structure S, the load receiving portion 18 </ b> A of the load transmission member 18 faces the seat rail 34 on the outer side in the vehicle width direction close to the inner side in the vehicle width direction. Therefore, when the seat rail 34 abuts against the load receiving portion 18A of the load transmission member 18, the displacement of the seat rail 34 in the vehicle width direction can be suppressed, and a side collision load is applied to the load transmission member 18. Can be transmitted from the load transmitting member 18 to the floor cross member 14 in the arrow B direction.

  Further, since the load receiving portion 18A faces the seat rail 34 fixed to the seat bracket 16 in the vicinity of the vehicle width direction, the load receiving portion 18A faces the leg portion 32. In comparison, the height from the floor cross member 14 to the load receiving portion 18A can be set lower. For this reason, the load transmission member 18 can be further reduced in size and weight, the moment acting on the standing portion 18C of the load transmission member 18 can be suppressed, and the seat rail 34 having a different installation height can be connected to the floor cross member 14. The load transmission efficiency can be improved. Furthermore, the portion on the base portion 18B side of the standing portion 18C spreads in a skirt shape in the vehicle width direction, which can suppress deformation of the standing portion 18C at the time of side collision load transmission.

  As shown in FIG. 7, when the load receiving portion 18 </ b> A is provided with the restricting portion 18 </ b> D, even if the seat rail 34 attempts to displace relative to the load transmitting member 18 in the side collision, the restriction is provided. Since the displacement of the portion 18D is restricted by engaging the seat rail 34, the side impact load can be efficiently transmitted from the seat rail 34 to the load receiving portion 18A in the direction of arrow A, and the load transmission is further performed. Transmission from the member 18 to the floor cross member 14 in the direction of arrow B is possible.

  Thus, in the vehicle seat lower structure S, the side impact load is transmitted to the floor 10 at a position in the vehicle width direction that is closer to the collision site than the tunnel portion 20A (FIG. 5) of the floor panel 20, and against the side impact load. The reaction force from the floor 10 can be generated earlier, and the deformation of the vehicle body can be suppressed.

  In the above-described embodiment, the load receiving portion 18A of the load transmitting member 18 is close to and opposed to the seat rail 34. However, the present invention is not limited to this, and the load receiving portion 18A is not limited to a side collision, that is, during normal use. And the seat rail 34 may be in contact with each other. In this case, the side collision load can be transmitted more directly from the seat rail 34 to the floor cross member 14. In addition, the load receiving portion 18A is opposed to the seat rail 34 in the vehicle width direction. However, the load receiving portion 18A is not limited to this, and when the seat rail 34 is not used, the load receiving portion 18A is located with respect to the leg portion 32. You may face or contact | abut in the vehicle width direction.

  Further, when the tunnel panel 20A is not provided on the floor panel 20, the floor cross member 14 may be extended from between the right side rocker 24 to the left side rocker (not shown). Further, the floor cross member 14 may be disposed on the lower surface side of the floor panel 20. In this case, the seat bracket 16 and the load transmission member 18 are fixed to the floor cross member 14 via the floor panel 20.

It is sectional drawing which shows the vehicle which has a seat lower part structure of a vehicle, and a side view which shows the front part of the other party vehicle before a side collision. FIG. 2 is an enlarged sectional view taken along arrow 2-2 in FIG. It is an enlarged front view showing a seat lower part structure of a vehicle. FIG. 3 is an enlarged front view showing an example in which a restricting portion for restricting the relative displacement of the seat rail to the vehicle upper side is provided in the load receiving portion in the vehicle seat lower structure. In FIG. 1, it is sectional drawing which shows the state which the other party vehicle collided with respect to the vehicle which has the seat lower part structure of a vehicle, and the side view which shows the front part of the other party vehicle. It is an enlarged front view which shows the state which is transmitting the side collision load from a seat rail to a floor cross member via a load transmission member. In an example in which a restricting portion is provided in the load receiving portion, the restricting portion restricts the relative displacement of the seat rail relative to the load transmitting member to the upper side of the vehicle, and a side cross load is passed from the seat rail to the floor cross member via the load transmitting member. It is an enlarged front view which shows the state which is transmitting to.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Floor 12 Vehicle seat 14 Floor cross member 16 Seat bracket 18 Load transmission member 18A Load receiving portion 18C Standing portion 18D Restriction portion 32 Leg portion 34 Seat rail S Lower structure of vehicle seat

Claims (3)

A floor cross member extending in the vehicle width direction on the floor of the vehicle;
A seat bracket which is provided on the floor cross member and supports a leg portion of the vehicle seat at a position higher above the vehicle than the floor cross member;
A load transmitting member provided on the floor cross member and having a load receiving portion facing from the vehicle width direction inner side to the leg portion on the vehicle width direction outer side;
A vehicle seat lower structure comprising:   The vehicle seat lower structure according to claim 1, wherein the load receiving portion is provided with a restriction portion that restricts displacement of the leg portion in the vehicle vertical direction at the time of a side collision. The leg portion is supported by a seat rail fixed to the seat bracket so that the vehicle front-rear direction position can be adjusted,
The vehicle seat lower structure according to claim 1, wherein the load receiving portion faces the seat rail from the inner side in the vehicle width direction.

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