JP6421739B2 - Vehicle lower structure - Google Patents

Description

  The present invention relates to a vehicle lower structure.

  Patent Document 1 listed below discloses a structure of a battery-equipped vehicle. This battery-equipped vehicle is equipped with a battery in which a projecting portion that projects from the floor panel toward the seat cushion is provided on the vehicle lower side of the vehicle seat. Further, a seat pipe for a vehicle seat is disposed on the vehicle upper side of the protruding portion. The seat pipe has a weakened portion at a position where it does not overlap the protruding portion. Therefore, in the case of a vehicle side collision (hereinafter, this collision mode is referred to as “side collision”), even if the seat pipe is deformed, the seat pipe is stably deformed at the weakened portion at a position away from the protruding portion. Interference between the pipe and the protrusion is suppressed. As a result, the input of the collision load from the seat pipe to the protruding portion and the battery is suppressed.

JP 2013-23163 A

  However, in the configuration disclosed in Patent Document 1, when a collision load is input to the side collision rocker, the rocker itself may be tilted with the vehicle front-rear direction as an axial direction. In particular, when the floor panel combined with the rocker is made of resin, if the rocker is tilted, the floor panel cannot follow the rocker tilt and stress may concentrate on the floor panel. The technology has room for improvement in this regard.

  In view of the above problems, an object of the present invention is to obtain a vehicle lower structure capable of suppressing the inclination of a rocker at the time of a side collision.

  A vehicle lower structure according to a first aspect of the present invention is a rocker that is provided on the outer side in the vehicle width direction of the floor panel and extends in the vehicle front-rear direction, and has a substantially rectangular cross section when viewed from the front of the vehicle. A floor cross member that is extended in the vehicle width direction and has both end portions in the vehicle width direction coupled to a substantially central portion in the vehicle vertical direction of the vehicle width direction inner wall portion of the rocker, and the one rocker and the other rocker And a battery mounted via a fastening portion through which a fastener is inserted into the floor panel, and an end portion on the outer side in the vehicle width direction is the vehicle width of the rocker. It is attached to the vehicle upper side in the direction inner wall portion, and the inner end in the vehicle width direction is opposed to the battery fastening portion in the floor cross member in the vehicle vertical direction. Has a seat bracket attached to sites that, the.

  According to the first aspect of the present invention, the outer end of the seat bracket in the vehicle width direction is attached to the vehicle upper side of the inner wall of the rocker in the vehicle width direction. The seat bracket is attached to a portion where the inner end in the vehicle width direction faces the fastening portion of the battery in the floor cross member in the vehicle vertical direction. That is, the end of the seat bracket in the vehicle width direction is attached to a portion facing the fastening portion whose rigidity has been improved by inserting the fastener in the vehicle vertical direction. By the way, in general, when a collision load is input to the rocker at the time of a side collision, the rocker is tilted with the vehicle front-rear direction as an axial direction around the portion coupled to the floor cross member. Specifically, the vehicle upper side of the rocker tends to be tilted inward in the vehicle width direction. However, the collision load input to the rocker is transmitted to the floor cross member via the seat bracket and also transmitted from the floor cross member to the fastening portion. That is, since the collision load input to the rocker is received by the fastening portion with increased rigidity, the inclination of the rocker is suppressed. Therefore, concentration of stress on the floor panel due to tilting of the rocker can be suppressed.

  The vehicle lower structure according to the first aspect of the present invention has an excellent effect that the inclination of the rocker at the time of a side collision can be suppressed.

It is a vehicle top view which shows the floor of the vehicle provided with the vehicle lower part structure which concerns on one Embodiment. It is an expanded sectional view which shows the state cut | disconnected along the AA in FIG. It is an expanded sectional view which shows the floor of the vehicle provided with the vehicle lower part structure which concerns on contrast.

  Hereinafter, an embodiment of a vehicle lower structure according to the present invention will be described with reference to FIGS. In these figures, the arrow FR indicates the front side in the vehicle longitudinal direction, the arrow OUT indicates the vehicle width direction outside, and the arrow UP indicates the vehicle vertical direction upper side.

  As shown in FIG. 1, a floor panel 12 constituting a floor portion of a passenger compartment is disposed in a vehicle lower part 10 of a vehicle to which the vehicle lower part structure of the present embodiment is applied. The floor panel 12 constitutes the bottom surface of the vehicle, and is formed of a substantially rectangular plate material in a vehicle plan view. The floor panel 12 is made of fiber reinforced resin as an example. Further, an end 14 of the floor panel 12 on the outer side in the vehicle width direction is fastened to a rocker 16 described later by a fastener 18 (see FIG. 2). In the vehicle lower part 10 shown in FIG. 1, illustration of a part of the left side of the vehicle is omitted, but the left side of the vehicle and the vehicle are sandwiched by a virtual line (not shown) extending in the vehicle front-rear direction at the vehicle width direction center. The right side is formed substantially symmetrically.

  A pair of left and right rockers 16 are provided on the outer side of the floor panel 12 in the vehicle width direction. Hereinafter, the rocker 16 on the left side of the vehicle will be described with reference to FIG. 2, but the rocker 16 on the right side of the vehicle has the same configuration.

  The rocker 16 extends in the vehicle front-rear direction, and includes a rocker inner panel 20 disposed on the inner side in the vehicle width direction and a rocker outer panel 22 disposed on the outer side in the vehicle width direction to form a closed cross-sectional structure. .

  The rocker inner panel 20 has a cross-sectional shape cut vertically along the vehicle width direction, and is formed in a substantially hat shape that is open to the outside in the vehicle width direction. The part 24 extends to the vehicle upper side. Further, an inner-side lower flange portion 26 extends downward from the lower portion of the rocker inner panel 20 toward the vehicle.

  The rocker outer panel 22 is disposed so as to face the rocker inner panel 20 in the vehicle width direction, and a cross-sectional shape cut vertically along the vehicle width direction is formed in a substantially hat shape opened to the inside in the vehicle width direction. ing. Further, an outer side upper flange portion 28 is extended to the upper side of the vehicle at the upper portion of the rocker outer panel 22, and an outer side lower flange portion 30 is extended to the lower side of the vehicle at the lower portion of the rocker outer panel 22. Yes. In the closed cross section of the rocker 16, a first partition wall 32 disposed on the upper side of the vehicle and extending in the horizontal direction, and a first partition wall 32 disposed on the lower side of the vehicle and extending in the horizontal direction. A second partition wall 34 and a third partition wall 36 disposed between the rocker inner panel 20 and the rocker outer panel 22 and extending in the vehicle vertical direction are provided. The inner side upper flange portion 24 of the rocker inner panel 20 is coupled to the outer side upper flange portion 28 of the rocker outer panel 22 with the vehicle upper side of the third partition wall 36 interposed therebetween. Similarly, the inner side lower flange portion 26 of the rocker inner panel 20 is coupled to the outer side lower flange portion 30 of the rocker outer panel 22 with the vehicle lower side of the third partition wall 36 sandwiched therebetween. Accordingly, the rocker 16 has a substantially rectangular cross-sectional shape when viewed from the front of the vehicle.

  A battery 38 is disposed inside the rocker 16 in the vehicle width direction and on the vehicle lower side of the floor panel 12. The battery 38 includes a battery body 40 and a cover 42, and the cover 42 is disposed so as to cover the battery body 40 from the vehicle lower side.

  Further, a fastening portion 44 is formed in the battery 38. The fastening portion 44 includes a fastening hole wall portion 50 that forms a fastening hole 48 through which the fastener 46 can be inserted, and a fastening portion formed in a concave shape on the vehicle upper side at a portion corresponding to the fastening hole wall portion 50 in the cover 42. And a seating surface 52. The fastening hole wall 50 extends from the fastening seat surface 52 of the cover 42 to the vehicle upper side surface of the battery main body 40 along the vehicle vertical direction. Further, a through hole 54 is formed in the fastening seat surface 52 at a position corresponding to the fastening hole 48 and penetrates in the plate thickness direction. Similarly, a through hole 56 is formed in the floor panel 12 at a position corresponding to the fastening hole 48 and penetrates in the thickness direction. Therefore, the fastener 46 is inserted into the fastening hole 48 from the fastening seat surface 52 toward the vehicle upper side, and the fastener 46 is attached to a nut 58 provided at a position corresponding to the through hole 56 of the floor panel 12. By fastening, the battery 38 is fixed to the floor panel 12.

  A floor cross member 60 is provided on the vehicle upper side of the floor panel 12. The floor cross member 60 extends in the vehicle width direction, and an end 62 in the vehicle width direction is coupled to the vehicle vertical direction substantially central portion 64 in the vehicle width direction inner wall 63 of the rocker inner panel 20. Yes. Although not shown, the floor cross member 60 has a substantially hat shape in which a cross-sectional shape in a side view of the vehicle is opened toward the vehicle lower side. That is, the upper side wall portion 66 provided on the vehicle upper side of the floor cross member 60 and the floor panel 12 are separated from each other in the vehicle vertical direction. At the same time, the upper side wall portion 66 and the distal end portion 68 of the fastener 46 inserted through the fastening portion 44 are also spaced apart.

  A seat bracket 70 is provided between the floor cross member 60 and the rocker 16. The seat bracket 70 includes a bracket center portion 72, a rocker side end portion 74 as an end portion on the outer side in the vehicle width direction, and a floor cross member side end portion 76 as an end portion on the inner side in the vehicle width direction. ing. The bracket central portion 72 is extended along the vehicle width direction, and a seat rail 78 that supports a vehicle seat (not shown) so as to be slidable in the vehicle front-rear direction is attached.

  The rocker side end portion 74 is formed continuously with the bracket center portion 72 and extends from the end portion of the bracket center portion 72 on the vehicle width direction outer side to the vehicle upper side. Further, the rocker side end portion 74 is coupled to the vehicle upper side of the vehicle width direction inner wall portion 63 of the rocker inner panel 20, that is, the vehicle upper side of the vehicle vertical direction substantially central portion 64.

  The floor cross member side end portion 76 is formed continuously with the bracket central portion 72, and extends extending obliquely from the end of the bracket central portion 72 on the vehicle width direction to the vehicle lower side. And an abutting portion 84 extending along the upper side wall portion 66 of the floor cross member 60 from the vehicle width direction inner end of the extending portion 82 to the vehicle width direction inner side. The contact portion 84 is disposed and coupled to a portion of the upper side wall portion 66 of the floor cross member 60 that faces the fastening portion 44 in the vehicle vertical direction.

  Next, the operation and effect of this embodiment will be described.

  Here, the operation and effect of this embodiment will be described using the proportionality shown in FIG. In addition, about the same component as this embodiment, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 3, a floor panel 102 that constitutes a floor portion of a passenger compartment is disposed in a vehicle lower portion 100 of the vehicle. The floor panel 102 constitutes the bottom surface of the vehicle, and is formed of a substantially rectangular plate material in a plan view of the vehicle. Further, the end 104 of the floor panel 102 on the outer side in the vehicle width direction is coupled to a rocker 106 described later by welding.

  The rocker 106 extends in the vehicle front-rear direction, and has a closed cross-sectional structure including a rocker inner panel 108 disposed on the inner side in the vehicle width direction and a rocker outer panel 110 disposed on the outer side in the vehicle width direction. .

  The rocker inner panel 108 has a cross-sectional shape that is cut vertically along the vehicle width direction, and is formed in a substantially hat shape that is open to the outside in the vehicle width direction. The part 112 is extended to the vehicle upper side. Further, an inner-side lower flange portion 114 is extended to the vehicle lower side at the lower portion of the rocker inner panel 108.

  The rocker outer panel 110 is disposed so as to face the rocker inner panel 108 in the vehicle width direction, and a cross-sectional shape cut vertically along the vehicle width direction is formed in a substantially hat shape opened to the inside in the vehicle width direction. ing. Further, an outer-side upper flange portion 116 is extended to the upper side of the vehicle at the upper portion of the rocker outer panel 110, and an outer-side lower flange portion 118 is extended to the lower side of the vehicle at the lower portion of the rocker outer panel 110. Yes. The inner side upper flange portion 112 of the rocker inner panel 108 is coupled to the outer side upper flange portion 116 of the rocker outer panel 110. Similarly, the inner side lower flange portion 114 of the rocker inner panel 108 is coupled to the outer side lower flange portion 118 of the rocker outer panel 110. As a result, the rocker 106 has a substantially rectangular cross-sectional shape when viewed from the front of the vehicle.

  A floor cross member 120 is provided on the vehicle upper side of the floor panel 102. The floor cross member 120 extends in the vehicle width direction, and an end 122 in the vehicle width direction is coupled to the vehicle vertical direction substantially central portion 124 of the rocker inner panel 108. Although not shown, the floor cross member 120 has a substantially hat shape in which a cross-sectional shape in a side view of the vehicle is opened to the vehicle lower side. That is, the upper side wall 126 provided on the upper side of the vehicle in the floor cross member 120 and the floor panel 102 are separated from each other in the vehicle vertical direction.

  In the above configuration, when a collision load is input to the rocker 106 at the time of a side collision, the rocker 106 itself is centered on the connecting portion with the floor cross member 120 and the vehicle front side of the rocker 106 is the vehicle width direction inner side. There is a possibility of being tilted to the right (arrow R in the figure). In particular, when the floor panel 102 combined with the rocker 106 is made of resin, if the rocker 106 is tilted, the floor panel 102 cannot follow the tilt of the rocker 106 and stress may concentrate on the floor panel 102. There is room for improvement in this respect.

  On the other hand, in the present embodiment, as shown in FIG. 2, the rocker side end portion 74 of the seat bracket 70 is attached to the vehicle upper side of the inner wall portion 63 of the rocker 16 in the vehicle width direction. The seat bracket 70 is attached to a portion of the floor cross member 60 where the abutting portion 84 on the floor cross member side end 76 faces the fastening portion 44 of the battery 38 in the floor cross member 60 in the vehicle vertical direction. That is, the contact portion 84 at the floor cross member side end portion 76 of the seat bracket 70 is attached at a position corresponding to the fastening portion 44 whose rigidity is improved by the insertion of the fastener 46. By the way, in general, when a collision load is input to the rocker 16 at the time of a side collision, the rocker 16 is tilted with the vehicle front-rear direction as an axial direction around a portion coupled to the floor cross member 60. Specifically, the vehicle upper side of the rocker 16 tends to be inclined inward in the vehicle width direction (arrow R in the figure). However, the collision load input to the rocker 16 is transmitted to the floor cross member 60 via the seat bracket 70, and the load is applied from the fastening portion 44 of the seat bracket 70 to the upper side wall portion 66 of the floor cross member 60. Communicated. The upper side wall portion 66 of the floor cross member 60 that receives the collision load is displaced to the vehicle lower side, and the displaced upper side wall portion 66 is provided on the vehicle lower side of the upper side wall portion 66. By abutting on the tip end portion 68 of the fastener 46 inserted through the portion 44, further displacement of the upper side wall portion 66 is suppressed. That is, since the collision load input from the seat bracket 70 to the floor cross member 60 is received by the highly rigid fastening portion 44, further tilting of the rocker 16 is suppressed. Thereby, the inclination of the rocker at the time of a side collision can be suppressed, and the concentration of stress on the floor panel due to the inclination of the rocker can be suppressed.

  In the present embodiment, the upper side wall portion 66 of the floor cross member 60 and the distal end portion 68 of the fastener 46 inserted through the fastening portion 44 are spaced apart from each other. Another member such as foamed resin or a bulkhead may be provided between the upper side wall portion 66 of the 60 and the tip end portion 68 of the fastener 46. As a result, when a collision load is input from the contact portion 84 of the seat bracket 70 to the upper wall portion 66 of the floor cross member 60, the upper wall portion 66 of the floor cross member 60 contacts another member such as foamed resin. Thus, the deformation of the upper side wall portion 66 of the floor cross member 60 is further suppressed, and the inclination of the rocker 16 is further suppressed.

  In addition, the floor cross member 60 is provided on the vehicle upper side of the floor panel 12, but is not limited thereto, and may be configured on the vehicle lower side of the floor panel 12. In this case, the floor cross member 60 has a substantially hat-shaped cross section when viewed from the side of the vehicle and opens toward the upper side of the vehicle, and a battery 38 on a lower side wall (not shown) provided on the lower side of the vehicle. Is attached via the fastening portion 44. And the contact part 84 of the seat bracket 70 is attached to the position corresponding to the fastening part 44 in the floor panel 12, thereby suppressing the inclination of the rocker 16 and improving the collision performance of the vehicle at the time of a side collision. Can be made.

  Furthermore, although the seat bracket 70 is configured to have the seat rail 78 attached thereto, the seat bracket 78 is not limited to this, and may be configured such that the seat rail 78 is not attached.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above, and various modifications other than those described above can be implemented without departing from the spirit of the present invention. Of course.

12 Floor panel 16 Rocker 38 Battery 44 Fastening portion 46 Fastening tool 60 Floor cross member 62 End portion (End portion of the floor cross member in the vehicle width direction)
63 Vehicle width direction inner side wall portion 64 Vehicle vertical direction substantially central portion 70 Seat bracket 74 Rocker side end portion (end portion of seat bracket in vehicle width direction outer side)
76 Floor cross member side end (end of seat bracket in the vehicle width direction)

Claims (1)

A rocker that is provided on the outer side in the vehicle width direction of the floor panel and extends in the vehicle front-rear direction, and has a substantially rectangular cross section in a vehicle front view;
A floor cross member extending in the vehicle width direction and having both ends in the vehicle width direction coupled to the vehicle vertical direction substantially central portion of the vehicle width direction inner wall portion of the rocker;
A battery which is disposed between the one rocker and the other rocker and on the vehicle lower side of the floor panel, and is attached via a fastening portion through which a fastener is inserted into the floor panel;
The outer end in the vehicle width direction is attached to the vehicle upper side of the vehicle width direction inner wall portion of the rocker, and the inner end in the vehicle width direction is the fastening portion of the battery in the floor cross member and the vehicle vertical direction. A seat bracket attached to the part opposite to
A vehicle lower structure having:

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