JP2018149836A - Lower body structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit side sills from entering inward in a vehicle width direction in case of a side impact without a necessity of increasing a vehicle height of a vehicle having a floor tunnel formed in a floor panel.SOLUTION: A lower body structure of a vehicle having a floor tunnel 10 formed in a floor panel 2 includes a cross member 4 being laid between right and left side sills 3 on the upper surface side of the floor panel 2 and extending in a vehicle width direction so as to intersect the floor tunnel 10. The floor tunnel 10 includes a forward tunnel 11 and backward tunnel 12. The rear end of the froward tunnel 11 is coupled to the cross member 4 on the forward side of a vehicle body, and the front end of the backward tunnel 12 is coupled to the cross member 4 on the backward side of the vehicle body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lower body structure of a vehicle, and more particularly to a lower body structure of a vehicle in which a floor tunnel portion is formed on a floor panel.

  In vehicles such as automobiles, a floor tunnel portion that bulges upward on the vehicle body is formed at the vehicle width direction center side of the floor panel that forms the floor surface of the passenger compartment, and the vehicle body lower side of the floor tunnel portion is formed on the vehicle body front side. 2. Description of the Related Art A power transmission member that transmits power from a disposed engine, an exhaust pipe that extends from the engine to the rear side of the vehicle body, and the like are known.

  Further, in a vehicle in which a floor tunnel portion is formed on the floor panel, a cross member is disposed on the upper surface side of the floor panel so as to extend in the vehicle width direction between the left and right side sills, and the cross member intersects the floor tunnel portion. What is divided into left and right at the part is known.

  For example, in Patent Document 1, in a vehicle in which a floor tunnel portion is formed on a floor panel, a cross member is disposed on the upper surface side of the floor panel so as to extend in the vehicle width direction between the left and right side sills. What is divided into right and left at a portion intersecting with the tunnel portion is disclosed.

  In addition, although the cross member is not divided into left and right at the portion where it intersects the floor tunnel portion, for example, in Patent Document 2, the cross member extends in the vehicle width direction between the left and right side sills on the upper surface side of the floor panel. The cross member extends linearly in the vehicle width direction above the vehicle body from the floor tunnel and forms a notch on the vehicle body lower side according to the shape of the floor tunnel at the portion intersecting the floor tunnel. What has been made to be disclosed is disclosed.

JP2015-003687A Japanese Patent No. 5558588

  Even in a vehicle such as an electric vehicle having a motor as a drive source for driving the vehicle and a battery for storing electric power supplied to the motor, when a large and heavy battery is mounted, the left and right A battery pipe is installed between the side sills, and a floor tunnel portion that bulges upward in the vehicle body is formed at the center in the vehicle width direction of the floor tunnel. Piping such as industrial piping may be arranged.

  In such a vehicle, a cross member is disposed on the upper surface side of the floor panel so as to extend in the vehicle width direction between the left and right side sills coupled to both ends of the floor panel in the vehicle width direction, and the cross member is connected to the floor tunnel portion. There are cases where the crossing part is divided into left and right.

  In recent years, in order to improve the safety of the vehicle, the side of the vehicle body is the inner side in the vehicle width direction when a collision load is applied to the side sill from the outer side in the vehicle width direction at the time of a side collision (pole side collision) with a utility pole. Even in a vehicle in which a floor tunnel portion is formed on the floor panel, it is required to suppress the side sill from entering the vehicle width direction inward in a side collision. ing.

  On the other hand, as described in Patent Document 2, a cross member is disposed so as to extend linearly in the vehicle width direction on the vehicle body upper side from the floor tunnel portion, and a portion intersecting the floor tunnel portion of the cross member However, if a cross member is provided above the vehicle body from the floor tunnel, it is necessary to increase the vehicle height in order to secure a vehicle compartment space.

  Accordingly, the present invention provides a vehicle having a floor tunnel portion formed on a floor panel, and can suppress the intrusion of a side sill into the vehicle width direction inward in a side collision without increasing the vehicle height. It is an object to provide a structure.

  In order to solve the above problems, the present invention is configured as follows.

  First, in the invention described in claim 1 of the present application, a floor tunnel portion that extends in the longitudinal direction of the vehicle body and bulges upward in the vehicle body is formed at the vehicle width direction center side of the floor panel that forms the floor surface of the passenger compartment. A vehicle body lower part structure of a vehicle, which is connected between both ends of the floor panel in the vehicle width direction and extends in the longitudinal direction of the vehicle body, and spans between the pair of left and right side sills on the upper surface side of the floor panel. A cross member extending in the vehicle width direction so as to intersect the floor tunnel portion, and the floor tunnel portion is divided in the vehicle front-rear direction by the cross member and is disposed on the vehicle body front side of the cross member. A tunnel portion and a rear tunnel portion disposed on the vehicle body rear side of the cross member, and a rear end portion of the front tunnel portion is formed on the cross member. Coupled to the body front side, the front end of the rear tunnel part is characterized in that it is coupled to the vehicle body rear side of the cross member.

  According to a second aspect of the present invention, in the first aspect of the present invention, the rear end portion of the front tunnel portion extends along the upper surface portion and the front surface portion of the cross member on the front side of the vehicle body. And a front end portion of the rear tunnel portion is connected to the upper surface portion and the rear surface portion along the upper surface portion and the rear surface portion of the cross member on the vehicle body rear side.

  The invention according to claim 3 is the invention according to claim 1 or claim 2, wherein the cross member divides the floor tunnel part into the front tunnel part and the rear tunnel part. And a piping arrangement portion for arranging piping arranged to extend in the longitudinal direction of the vehicle body on the vehicle body lower side of the floor tunnel portion.

  According to a fourth aspect of the present invention, in the invention of the third aspect, the piping arrangement portion includes openings formed in a front surface portion and a rear surface portion of the cross member, or the cross member. It is the recessed part which is formed in a front part and a rear surface part, respectively, and is depressed in the upper side from each lower end part of the front part of the said cross member, and a rear surface part, It is characterized by the above-mentioned.

  According to the invention described in claim 1 of the present application, the vehicle body lower part structure in which the floor tunnel portion is formed on the floor panel is constructed between the pair of left and right side sills on the upper surface side of the floor panel and intersects with the floor tunnel portion. The floor tunnel portion includes a front tunnel portion and a rear tunnel portion, and the rear end portion of the front tunnel portion is coupled to the vehicle body front side of the cross member. The front end portion of the tunnel portion is coupled to the vehicle body rear side of the cross member.

  As a result, the cross member is installed between the side sills without being divided into left and right by the floor tunnel portion, so that the collision load input to one side sill at the time of a side collision is transmitted to the other side sill via the cross member. It is possible to prevent the side sill from entering the vehicle width direction inward side. If the cross member is installed above the floor tunnel to install it between the left and right side sills, it is necessary to raise the vehicle height in order to secure the passenger compartment space, but the floor tunnel is divided by the cross member. In addition, since it is not necessary to dispose the cross member above the floor tunnel portion, the side sill can be prevented from entering the vehicle width direction inward side at the time of a side collision without increasing the vehicle height.

  According to the second aspect of the present invention, the rear end portion of the front tunnel portion is coupled along the upper surface portion and the front portion of the cross member on the vehicle body front side, and the front end portion of the rear tunnel portion is the cross member. By joining along the upper surface portion and the rear surface portion of the member on the vehicle body rear side, the rigidity of the cross member can be improved, and the above-described effect can be obtained effectively.

  According to a third aspect of the present invention, the cross member extends in the longitudinal direction of the vehicle body on the vehicle body lower side of the floor tunnel portion at a portion dividing the floor tunnel portion into the front tunnel portion and the rear tunnel portion. By providing a piping arrangement part that arranges the arranged piping, even when the floor tunnel part is divided by the cross member, the layout of the piping arranged on the vehicle body lower side of the floor tunnel part is changed. The piping can be arranged without any problems.

  According to the invention described in claim 4, the piping arrangement portion is an opening or a recess formed in the front portion and the rear portion of the cross member, respectively, and is necessary for arranging the piping. By forming only the size opening or recess, piping can be routed while suppressing a decrease in rigidity of the cross member, and the above-described effect can be obtained effectively.

It is the perspective view seen from the vehicle body upper side of the vehicle body which applied the lower vehicle body structure of the vehicle which concerns on embodiment of this invention. It is a top view of the vehicle body shown in FIG. It is a bottom view of the vehicle body shown in FIG. FIG. 4 is a bottom view of the vehicle body shown in FIG. 3 with a battery and a battery frame removed. FIG. 3 is a cross-sectional view of the vehicle body taken along line Y5-Y5 in FIG. FIG. 3 is a cross-sectional view of the vehicle body taken along line Y6-Y6 in FIG. FIG. 3 is a cross-sectional view of the vehicle body taken along line Y7-Y7 in FIG. It is a principal part enlarged view of the vehicle body shown in FIG. It is a figure which shows the reinforcement member arrange | positioned at a cross member. It is sectional drawing of the vehicle body along the Y10-Y10 line | wire in FIG. It is a figure which shows another piping arrangement | positioning part provided in a cross member. It is sectional drawing of the vehicle body along the Y12-Y12 line | wire in FIG. It is a perspective view which shows an impact-absorbing member.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a vehicle body to which a lower body structure of a vehicle according to an embodiment of the present invention is applied, viewed from above the vehicle body, FIG. 2 is a top view of the vehicle body shown in FIG. 1, and FIG. 4 is a bottom view of the vehicle body shown in FIG. 3 with the battery and the battery frame removed, FIG. 5 is a cross-sectional view of the vehicle body taken along line Y5-Y5 in FIG. 2, and FIG. 2 is a cross-sectional view of the vehicle body taken along line Y6-Y6 in FIG. 2, FIG. 7 is a cross-sectional view of the vehicle body taken along line Y7-Y7 in FIG. 2, and FIG. 8 is an enlarged view of a main part of the vehicle body shown in FIG.

  A vehicle body 1 to which a lower vehicle body structure of a vehicle according to an embodiment of the present invention is applied is a vehicle body such as an electric vehicle including a motor as a drive source for driving the vehicle and a battery for storing electric power supplied to the motor. As shown in FIGS. 1 to 8, a floor panel 2 that forms a floor surface of a passenger compartment at the lower part of the vehicle body, and a pair of left and right members that are coupled to both ends in the vehicle width direction of the floor panel 2 and extend in the longitudinal direction of the vehicle body A side sill 3 and a plurality of cross members that extend between the pair of left and right side sills 3 on the upper surface side of the floor panel 2 and extend in the vehicle width direction, specifically, a first cross member 4 and a second cross member 5 are provided. Yes.

  The floor panel 2 is formed with a floor tunnel portion 10 that extends in the longitudinal direction of the vehicle body and bulges upward of the vehicle body at the center side in the vehicle width direction. The floor tunnel portion 10 is divided in the longitudinal direction of the vehicle body by the first cross member 4, and is disposed on the front tunnel portion 11 disposed on the vehicle body front side of the first cross member 4 and on the vehicle body rear side of the first cross member 4. And a rear tunnel portion 12.

  The front tunnel portion 11 includes an upper surface portion 11a, side surface portions 11b on both sides, and first flange portions 11c on both sides, and is formed in a substantially hat shape in cross section. The first flange portions 11c on both sides are welded to the floor panel 2 by welding or the like. It is joined. At the rear end portion of the front tunnel portion 11, there are a second flange portion 11d extending from the upper surface portion 11a to the vehicle body rear side, and third flange portions 11e on both sides extending from the side surface portions 11b on both sides outward in the vehicle width direction. The second flange portion 11d and the third flange portions 11e on both sides are joined to the vehicle body front side of the first cross member 4 by welding or the like.

  The rear side tunnel part 12 is also provided with the upper surface part 12a, the side part 12b of both sides, and the 1st flange part 12c of both sides, and is formed in cross-sectional substantially hat shape, and the 1st flange part 12c of both sides is welded to the floor panel 2. It is joined by etc. At the front end portion of the rear tunnel portion 12, there are a second flange portion 12d extending from the upper surface portion 12a to the front side of the vehicle body and third flange portions 12e on both sides extending from the side surface portions 12b on both sides outward in the vehicle width direction. The second flange portion 12d and the third flange portions 12e on both sides are joined to the vehicle body rear side of the first cross member 4 by welding or the like.

  As shown in FIGS. 5 and 6, the left and right side sills 3 respectively have a side sill inner 21 that constitutes the inside of the vehicle body of the side sill 3, a side sill outer 22 that constitutes the outside of the vehicle body of the side sill 3, and the side sill inner 21 and the side sill outer 22. Side sill rain 23 disposed between the two. 1 to 4, only the side sill inner 21 of the side sill 3 is shown.

  The side sill inner 21 includes a vertical surface portion 21a extending in the vertical direction of the vehicle body and an upper surface portion 21b and a lower surface portion 21c extending substantially horizontally from the upper end portion and the lower end portion of the vertical surface portion 21a to the vehicle outer side so as to bulge out to the vehicle inner side. The side sill rain 23 and the side sill outer 22 are formed in a substantially hat shape so as to bulge to the outside of the vehicle. The side sill inner 21, the side sill rain 23, and the side sill outer 22 are overlapped and joined by welding or the like at both ends in the vertical direction of the vehicle body, and the side sill 3 is formed in a closed cross-sectional shape.

  The first cross member 4 and the second cross member 5 are joined to the upper surface side of the floor panel 2 by welding or the like so as to intersect the floor tunnel portion 10. The first cross member 4 and the second cross member 5 are spaced apart from each other in the vehicle body front-rear direction, and the first cross member 4 is disposed on the vehicle body front side of the second cross member 5.

  In the present embodiment, the first cross member 4 extends in the vehicle width direction across the left and right side sills 3 without being divided in the vehicle width direction. As shown in FIG. 7, the first cross member 4 includes an upper surface portion 4a, a front surface portion 4b and a rear surface portion 4c extending from the front and rear end portions of the upper surface portion 4a to the vehicle body lower side, The front flange portion 4d and the rear flange portion 4e extending from the lower end portions of the portion 4b and the rear surface portion 4c to the vehicle body front side and the vehicle body rear side, respectively, are formed in a substantially hat shape in cross section, and the front flange portion 4d and the rear flange portion The part 4e is joined to the floor panel 2 by welding or the like.

  Both ends of the first cross member 4 in the vehicle width direction are joined to the side sills 3 by welding or the like, respectively, and the rear end portion and the rear side of the front tunnel portion 11 on the vehicle body front side and vehicle body rear side at the vehicle width direction center side, respectively. The front end portion of the tunnel portion 12 is coupled. As shown in FIG. 2, the second flange portion 11d of the front tunnel portion 11 and the third flange portions 11e on both sides are respectively connected to the upper surface portion 4a along the upper surface portion 4a and the front surface portion 4b of the first cross member 4 on the vehicle body front side. And the second flange portion 12d of the rear tunnel portion 12 and the third flange portions 12e on both sides of the first cross member 4 are upper surfaces along the upper surface portion 4a and the rear surface portion 4c on the vehicle body rear side, respectively. It is joined to the part 4a and the rear surface part 4c.

  The first cross member 4 also has a cross member-side weakened portion 4f that is weaker than other portions of the first cross member 4 when the impact load is applied from the outer side in the vehicle width direction. It is provided on both sides in the vehicle width direction. The cross member-side weakened portion 4f is formed by recesses 4f provided on the front surface portion 4b and the rear surface portion 4c of the first cross member 4, respectively. The recess portions 4f are formed on the front surface portion 4b and the rear surface portion 4c of the first cross member 4. The first cross member 4 is provided so as to extend in the vertical direction of the vehicle body and to be recessed on the inner side of the first cross member 4 in a circular arc shape.

  The recesses 4f provided in the front surface portion 4b and the rear surface portion 4c of the first cross member 4 are arranged at the same position in the vehicle width direction, and the front surface portion 4b and the rear surface portion 4c of the first cross member 4 Two concave portions 4f are provided on both sides in the width direction so as to be separated from each other in the vehicle width direction. As shown in FIG. 6, the recess 4 f of the first cross member 4 is provided so as to be positioned on the outer side in the vehicle width direction from a side frame 40 described later.

  FIG. 9 is a diagram showing a reinforcing member disposed on the cross member. In FIG. 9, the first cross member is indicated by a two-dot chain line. As shown in FIG. 9, the first cross member 4 is provided with a reinforcing member, specifically, a first reinforcing member 31 and a second reinforcing member 32. The first reinforcing member 31 and the second reinforcing member 32 are The first cross member 4 extends in the vehicle width direction, which is the axial direction of the first cross member 4, and is shorter than the first cross member 4 in the vehicle width direction.

  As shown in FIG. 7, the first reinforcing member 31 is substantially disposed on the upper surface portion 31 a disposed substantially parallel to the upper surface portion 4 a of the first cross member 4, and the front surface portion 4 b and the rear surface portion 4 c of the first cross member 4. A front surface portion 31b and a rear surface portion 31c that are disposed along the vehicle body and extend from the vehicle body front side and vehicle body rear side end portions of the upper surface portion 31a to the vehicle body lower side are formed in a substantially U-shaped cross section. On the upper surface portion 31a of the first reinforcing member 31, a bead portion 31d that is recessed in a substantially triangular shape on the lower side of the vehicle body is formed on the center side in the longitudinal direction of the vehicle body.

  The second reinforcing member 32 is disposed on the vehicle body lower side of the first reinforcing member 31, and an upper surface portion 32 a disposed substantially parallel to the upper surface portion 4 a of the first cross member 4, and the front surface portion 4 b of the first cross member 4. And a front surface portion 32b and a rear surface portion 32c which are disposed substantially parallel to and spaced apart from the rear surface portion 4c and extend from the vehicle body front side and vehicle body rear side ends of the upper surface portion 32a to the vehicle body lower side, respectively, and the front surface portion 32b and the rear surface portion. A front flange portion 32d and a rear flange portion 32e extending from the lower end of 32c to the vehicle body front side and the vehicle body rear side, respectively, are formed in a substantially hat shape in cross section. As for the 2nd reinforcement member 32, the front side flange part 32d and the rear side flange part 32e are joined to the floor panel 2 with the front side flange part 4d and the rear side flange part 4e of the 1st cross member 4, respectively.

  The first reinforcing member 31 and the second reinforcing member 32 are provided at the same position in the vehicle width direction inside the first cross member 4, and at both ends in the vehicle width direction of the first reinforcing member 31 and the second reinforcing member 32. As shown in FIG. 9, a connecting member 33 that connects the first reinforcing member 31 and the second reinforcing member 32 is provided.

  The connecting member 33 includes a partition surface portion 33a extending in a direction substantially orthogonal to the vehicle width direction that is the axial direction of the first cross member 4 so as to partition the inside of the first cross member 4 in the vehicle width direction, and an upper end of the partition surface portion 33a. A first flange portion 33b extending inward in the vehicle width direction from the first portion, second flange portions 33c on both sides extending inward in the vehicle width direction from the vehicle body upper side at both ends of the partition surface portion 33a in the vehicle longitudinal direction, There are provided third flange portions 33d on both sides extending from the vehicle body lower side to the vehicle width direction inner side at both ends of the surface portion 33a in the vehicle longitudinal direction.

  The first flange portion 33b is joined to the upper surface portion 31a of the first reinforcing member 31 by welding or the like, and the second flange portions 33c on both sides are respectively welded to the front surface portion 31b and the rear surface portion 31c of the first reinforcing member 31. The third flange portions 33d on both sides are joined to the front surface portion 32b and the rear surface portion 32c of the second reinforcing member 32 by welding or the like, respectively. The first reinforcing member 31 and the second reinforcing member 32 are connected at both ends in the vehicle width direction by a connecting member 33, and extend between portions corresponding to the left and right side frames 40 in the vehicle width direction, that is, in the vehicle width direction. In FIG. 2, the first side frame 40 is disposed from the position overlapping one side frame 40 to the position overlapping the other side frame 40.

  FIG. 10 is a cross-sectional view of the vehicle body taken along line Y10-Y10 in FIG. As shown in FIG. 10, the first cross member 4 also has a floor tunnel portion at a connecting portion with the floor tunnel portion 10 which is a portion that divides the floor tunnel portion 10 into a front tunnel portion 11 and a rear tunnel portion 12. 10 is provided with a piping arrangement portion 4g for arranging the piping 6 arranged so as to extend in the longitudinal direction of the vehicle body.

  In the first cross member 4, a substantially rectangular opening 4g is formed in each of the front surface portion 4b and the rear surface portion 4c as the piping arrangement portion 4g. In FIG. 10, the opening 4 g formed in the rear surface portion 4 c of the first cross member 4 is shown. However, the front surface portion 4 b of the first cross member 4 also has a substantially rectangular opening as in the rear surface portion 4 c. 4g is formed.

  The opening 4g formed in the front surface portion 4b and the rear surface portion 4c of the first cross member 4 is provided so as to connect the front tunnel portion 11 and the rear tunnel portion 12 in the longitudinal direction of the vehicle body. A pipe 6 such as a cable pipe or a brake pipe extending in the longitudinal direction of the vehicle body 10 is disposed in the longitudinal direction of the vehicle body through the front tunnel portion 11, the first cross member 4, and the rear tunnel portion 12. It is formed as follows.

  When the opening 4g is formed as the piping arrangement portion 4g in the first cross member 4, the first reinforcing member 31 and the second reinforcing member 32 are arranged at a position facing the opening 4g of the first cross member 4. In this case, the first reinforcing member 31 and the second reinforcing member 32 can also be formed with a substantially rectangular opening corresponding to the opening 4g of the first cross member 4 as a piping arrangement portion. In addition, it may replace with a substantially rectangular opening as a piping arrangement | positioning part, and you may make it form the opening part of other shapes, such as circular.

  FIG. 11 is a diagram illustrating another piping arrangement unit provided in the cross member. As shown in FIG. 11, as a piping arrangement | positioning part provided in the 1st cross member 4, the front surface part 4b and the rear surface part 4c of the 1st cross member 4 are respectively provided in the front surface part 4b and the rear surface part 4c of the 1st cross member 4. It is also possible to form a concave portion 4g ′ that is recessed in a substantially rectangular shape from the lower end of each of the above.

  Even in such a case, the recesses 4g ′ formed in the front surface portion 4b and the rear surface portion 4c of the first cross member 4 respectively communicate the front tunnel portion 11 and the rear tunnel portion 12 in the longitudinal direction of the vehicle body. A pipe 6 such as a cable pipe or a brake pipe that is provided and extends in the vehicle longitudinal direction on the lower side of the vehicle body of the floor tunnel portion 10 passes through the front tunnel portion 11, the first cross member 4, and the rear tunnel portion 12. It is formed so as to be arranged in the front-rear direction.

  Even in the case where the concave portion 4g ′ is formed as the piping arrangement portion 4g ′ in the first cross member 4, the first reinforcing member 31 and the second reinforcing member 32 are located at positions facing the concave portion 4g ′ of the first cross member 4. When arranged, the first reinforcing member 31 and the second reinforcing member 32 can also be formed with a substantially rectangular recess corresponding to the recess 4g ′ of the first cross member 4 as a piping arrangement portion. In addition, you may make it form a recessed part of other shapes, such as a semicircle, instead of the substantially rectangular shaped recessed part as a piping arrangement | positioning part.

  As for the second cross member 5, as shown in FIGS. 1 and 2, the upper surface portion 5a and the front surface portion 5b and the rear surface portion that extend from the vehicle body front side and vehicle body rear side end portions of the upper surface portion 5a to the vehicle body lower side, respectively. 5c and a front flange portion 5d and a rear flange portion 5e extending from the lower end portions of the front surface portion 5b and the rear surface portion 5c to the vehicle body front side and the vehicle body rear side, respectively, and are formed in a substantially hat-shaped cross section. The rear flange portion 5e is joined to the floor panel 2 by welding or the like.

  The second cross member 5 is divided in the vehicle width direction by the floor tunnel portion 10, and each of the second cross members 5 divided in the vehicle width direction is welded to the side sill 3 at the end on the outer side in the vehicle width direction. The end portion on the inner side in the vehicle width direction is joined to the floor tunnel portion 10, specifically, the rear tunnel portion 12 by welding or the like.

  The second cross members 5 divided in the vehicle width direction are seat rails on the outer side in the vehicle width direction and on the inner side in the vehicle width direction on the upper surface portion 5a of the second cross member 5, respectively. Seat rail mounting members 7 and 8 for mounting (not shown) are provided.

  The seat rail attachment member 7 is disposed on the outer side in the vehicle width direction, and is joined to the second cross member 5 and to the side sill 3. The seat rail mounting member 8 is disposed on the inner side in the vehicle width direction, is joined to the second cross member 5 and is joined to the floor tunnel portion 10, specifically, the rear tunnel portion 12.

  In the vehicle body 1, the first cross member 4 and the second cross member 5 are disposed so as to overlap with the battery 9 disposed below the floor panel 2 in the longitudinal direction of the vehicle body.

  As shown in FIGS. 3 and 4, the vehicle body 1 is also provided with a pair of left and right side frames 40 that are disposed on the lower surface side of the floor panel 2 so as to be spaced apart from each other in the vehicle width direction and extend in the vehicle longitudinal direction, as shown in FIGS. A battery 9 disposed between the pair of left and right side frames 40 below the floor panel 2 and a battery frame 50 that supports the battery 9 are provided.

  The side frame 40 is disposed between the floor tunnel portion 10 and the side sill 3 in the vehicle width direction. As shown in FIG. 6, the side frame 40 includes a lower surface portion 40a, side surface portions 40b on both sides extending upward from both ends in the vehicle width direction of the lower surface portion 40a, and both side surfaces extending outward from the side surface portions 40b on both sides. The flange part 40c is provided with the flange part 40c, and it is formed in a substantially hat shape in cross section. The flange parts 40c on both sides are joined to the lower surface side of the floor panel 2 by welding or the like to form a closed cross section.

  The battery 9 extends in the vehicle front-rear direction from the vehicle body front side from the first cross member 4 to the vehicle body rear side from the second cross member 5, and is attached to the upper surface side of the battery tray 60. As shown in FIG. 6, the battery tray 60 includes a base portion 61 to which the battery 9 is attached, a vertical wall portion 62 that extends upward from the peripheral portion of the base portion 61, and a flange that extends outward from the upper end portion of the vertical wall portion 62. The flange portion 63 is attached to the battery frame 50.

  As shown in FIG. 3, the battery frame 50 includes a front frame 51 that is disposed on the vehicle body front side and extends in the vehicle width direction, a rear frame 52 that is disposed on the vehicle body rear side and extends in the vehicle width direction, and the front frame 51. Both side frames 53 are connected to both sides in the vehicle width direction and both sides in the vehicle width direction of the rear frame 52 and extend in the longitudinal direction of the vehicle body, and the side frames 53 on both sides are respectively provided to the vehicle bodies of the left and right side frames 40. It is arranged on the lower side and attached to the side frame 40.

  12 is a cross-sectional view of the vehicle body taken along line Y12-Y12 in FIG. As shown in FIG. 12, the front frame 51, the rear frame 52, and the side frames 53 on both sides are respectively an upper frame 55 that constitutes the upper side of the vehicle body of the battery frame 50 and a lower frame that constitutes the lower side of the vehicle body of the battery frame 50. 56.

  The upper frame 55 includes an upper surface portion 55a that extends in a direction substantially orthogonal to the vehicle body vertical direction and an inner surface portion 55b that is disposed on the vehicle inner side and extends in the vehicle body vertical direction. There are provided flange portions 55c and 55d extending in a substantially vertical direction and a substantially horizontal direction from 55a and the inner surface portion 55b, respectively.

  On the other hand, the lower frame 56 includes a lower surface portion 56a extending in a direction substantially orthogonal to the vehicle body vertical direction and an outer surface portion 56b disposed outside the vehicle and extending in the vehicle body vertical direction, and is formed in a substantially L-shaped cross section. Flange portions 56c and 56d extending in a substantially horizontal direction and a substantially vertical direction from the lower surface portion 56a and the outer surface portion 56b are provided.

  The battery frame 50 overlaps the flange portions 55c and 55d of the upper frame 55 with the flange portions 56d and 56c of the lower frame 56 and joins them together by welding or the like, so that the battery frame 50 extends in a substantially horizontal direction. And a flange section 50b extending in the shape of a closed section.

  The battery frame 50 is also formed with a step portion 55e that is recessed toward the vehicle body lower side on the inner side in the vehicle width direction of the upper surface portion 55a of the upper frame 55. A flange portion 63 of the battery tray 60 is attached to the step portion 55 e of the battery frame 50, and the battery 9 is supported on the battery frame 50.

  The battery frame 50, specifically, the side frame 53 is disposed substantially along the side frame 40 and connected to the side frame 40. As shown in FIG. 12, in the frame connection portion 58 that connects the battery frame 50 and the side frame 40, the side frame 40 has a bolt insertion hole 40d formed in the lower surface portion 40a and corresponds to the bolt insertion hole 40d. The nut N is fixed to the upper surface side of the lower surface portion 40a by welding or the like.

  On the other hand, the battery frame 50, specifically, the side frame 53, has a bolt insertion hole 55 f formed in the upper surface portion 55 a of the upper frame 55 and a bolt insertion hole 56 e formed in the lower surface portion 56 a of the lower frame 56, A cylindrical member 57 which is formed in a cylindrical shape and into which a bolt is inserted is fixed to the lower surface side of the upper surface portion 55a of the upper frame 55 by welding or the like.

  Then, in a state where the upper surface portion 55a of the upper frame 55 of the battery frame 50 is disposed below the lower surface portion 40a of the side frame 40, the bolt B is screwed into the nut N from the lower side of the battery frame 50, and the battery frame 50 And the side frame 40 are connected. A plurality of frame connection portions 58 are provided in the longitudinal direction of the vehicle body of the side frame 53. In the vehicle body 1, the vehicle body front-rear direction, the vehicle body front side from the first cross member 4, the first and second cross members 4, 5 and The second cross member 5 is provided behind the vehicle body.

  As shown in FIGS. 3 and 4, the vehicle body 1 also includes a plurality of impact absorbing members 70 at the lower part of the vehicle body and extending in the vehicle width direction between the side frame 40 and the side sill 3 on the lower surface side of the floor panel 2. 80 is arranged. The impact absorbing members 70, 80 absorb the impact load input from the outer side in the vehicle width direction at the time of a side collision, and are coupled to the side frame 40 and the side sill 3.

  In the vehicle body 1, the first shock absorbing member 70 and the second shock absorbing member 80 are disposed apart from each other in the vehicle longitudinal direction, and the first shock absorbing member 70 is disposed on the vehicle body front side of the second shock absorbing member 80. Has been. The first shock absorbing member 70 is disposed at a position overlapping the first cross member 4 in the longitudinal direction of the vehicle body, and the second shock absorbing member 80 is positioned at a position overlapping the second cross member 5 in the longitudinal direction of the vehicle body. It is arranged. The first shock absorbing member 70 and the second shock absorbing member 80 are respectively disposed on both sides of the vehicle body 1 in the vehicle width direction.

  FIG. 13 is a perspective view showing the shock absorbing member, and shows the first shock absorbing member disposed on the left side of the vehicle body. As shown in FIG. 13, the first shock absorbing member 70 includes side portions 71 and 72 on both sides that are spaced apart in parallel in the longitudinal direction of the vehicle body and extend in a direction substantially perpendicular to the longitudinal direction of the vehicle body, and side surfaces on both sides. The end portions of the portions 71 and 72 on the vehicle body lower side are connected to each other and a bottom surface portion 73 extending in the vehicle body front-rear direction is formed to have a substantially U-shaped cross section.

  The side portions 71 and 72 on both sides are formed in substantially the same shape, and the end on the outer side in the vehicle width direction is formed in accordance with the side sill 3, specifically, the vertical surface portion 21 a of the side sill inner 21. An end portion on the side is formed according to the side surface portion 40b of the side frame 40, and is formed in a substantially trapezoidal shape so as to taper from the inner side in the vehicle width direction toward the outer side in the vehicle width direction.

  The side surface portion 71 arranged on the front side of the vehicle body is provided at an outer flange portion 71a provided at an end portion on the outer side in the vehicle width direction and extending toward the front side of the vehicle body, and provided at an end portion on the inner side in the vehicle width direction. An inner flange portion 71b that extends to the front side of the vehicle body and an upper flange portion 71c that is provided at an end portion on the upper side of the vehicle body and extends to the front side of the vehicle body are provided.

  The side surface portion 72 arranged on the rear side of the vehicle body is also provided at the outer flange portion 72a provided at the end portion on the outer side in the vehicle width direction and extending toward the rear side of the vehicle body, and at the end portion on the inner side in the vehicle width direction. An inner flange portion 72b that extends to the rear side of the vehicle body and an upper flange portion 72c that is provided at an end portion on the upper side of the vehicle body and extends to the rear side of the vehicle body are provided.

  Further, the bottom surface portion 73 is provided with an outer flange portion 73a provided at an end portion on the outer side in the vehicle width direction and extending outwardly in the vehicle width direction, and provided at an end portion on the inner side in the vehicle width direction. And an inner flange portion 73b extending inward in the direction.

  The first shock absorbing member 70 is formed in a tapered shape as the side surface portions 71 and 72 on both sides go from the inner side in the vehicle width direction to the outer side in the vehicle width direction, and on the vehicle body lower side of the side surface portions 71 and 72 on both sides. These end portions are connected by a bottom surface portion 73, and are formed to be tapered from the inner side in the vehicle width direction toward the outer side in the vehicle width direction.

  The first shock absorbing member 70 is also applied to other portions of the first shock absorbing member 70 against an impact load input from the outer side in the vehicle width direction when an impact load is applied from the outer side in the vehicle width direction. As compared with the weaker portions 71d and 72d on the side of the shock absorbing member, the side portions 71 and 72 on both sides are provided.

  The shock absorbing member-side weakened portions 71d and 72d are formed by concave portions 71d and 72d provided on the side surface portions 71 and 72 on both sides, respectively. The first shock absorbing member 70 extends inward and is recessed in a substantially trapezoidal cross section.

  The recesses 71d and 72d provided in the side portions 71 and 72 on both sides are provided at the same position in the vehicle width direction, and preferably, as shown in FIG. 40 is provided at a position that overlaps in the vehicle width direction with a recess 4f as a cross member side weakened portion 4f provided on the first cross member 4 when disposed between the first and second cross members 4.

  In the first shock absorbing member 70, upper flange portions 71c, 72c provided on the side surface portions 71, 72 on both sides are joined to the lower surface side of the floor panel 2 by welding or the like, and provided on the side surface portions 71, 72 on both sides. The outer flange portions 73a and 72a and the outer flange portion 73a provided on the bottom surface portion 73 are joined to the side sill 3 by welding or the like, and the inner flange portions 71b and 72b and the bottom surface portion 73 provided on the side surface portions 71 and 72 on both sides are joined. The provided inner flange portion 73 b is joined to the side frame 40 by welding or the like, and joined to the floor panel 2, the side sill 3, and the side frame 40.

  Specifically, the outer flange portions 71 a and 72 a provided on the side surface portions 71 and 72 on both sides are joined to the vertical surface portion 21 a of the side sill inner 21, and the outer flange portion 73 a provided on the bottom surface portion 73 is connected to the side sill inner 21. Inner flange portions 71b and 72b provided on the side surface portions 71 and 72 on both sides are joined to the lower surface portion 21c, and the inner side flange portion 73b provided on the bottom surface portion 73 is joined to the side surface portion 40b of the side frame 40. 40 is joined to the lower surface portion 40a.

  The second shock absorbing member 80 is formed in the same manner as the first shock absorbing member 70 except that the concave portions as the shock absorbing member side weakened portions are not provided on the side surface portions on both sides. The second shock absorbing member 80 is disposed at a position overlapping the second cross member 5 in the longitudinal direction of the vehicle body, and disposed between the side sill 3 and the side frame 40 on the lower surface side of the floor panel 2. 2 and the side sill 3 and the side frame 40.

  As shown in FIG. 5, the battery frame 50 has a flange portion 50 a cut out corresponding to a portion where the shock absorbing members 70, 80 and the side frame 40 are coupled, and interferes with the shock absorbing members 70, 80. It is formed so as not to.

  When an impact load acts on the side sill 3 from the outside in the vehicle width direction at the time of a side collision (pole side collision), the impact load input to the side sill 3 is a first impact absorbing member. 70 and the first cross member 4, and the impact load is absorbed by the first shock absorbing member 70 and the first cross member 4 disposed on the vehicle outer side than the side frame 40.

  Further, since the reinforcing members 31 and 32 are disposed on the first cross member 4 across the portions corresponding to the left and right side frames 40 in the vehicle width direction, the first cross member 4 is a side frame in the vehicle width direction. The deformation between 40 is suppressed.

  Further, since the first shock absorbing member 70 and the first cross member 4 are disposed at positions that overlap in the longitudinal direction of the vehicle body, when an impact load is applied to the side sill 3, the first shock absorbing member 70 and The first cross member 4 effectively suppresses deformation of the vehicle body 1 between the side frames 40 in the vehicle width direction.

  In the vehicle body 1, the first cross member 4 is installed between the side sills 3 without being divided into left and right by the floor tunnel portion 10. It is possible to transmit directly to the other side sill 3, and the side sill 3 is prevented from entering inward in the vehicle width direction.

  In the vehicle body 1, the second cross member 5 is provided by being divided in the vehicle width direction by the floor tunnel portion 10, but the floor tunnel portion 10 is divided without being divided in the vehicle width direction so that the left and right side sills 3 are separated. It can be formed in the same manner as the first cross member 4 extending in the vehicle width direction therebetween.

  In such a case, the floor tunnel portion 10 is also arranged by the second cross member 5 at the front tunnel portion disposed on the vehicle body front side of the second cross member 5 and the rear side disposed at the vehicle body rear side of the second cross member 5. Similar to the connecting portion between the first cross member 4 and the floor tunnel portion 10, the rear end portion of the front tunnel portion is connected to the vehicle body front side of the second cross member 5, and the rear side The front end portion of the tunnel portion is coupled to the vehicle body rear side of the second cross member 5.

  Further, the second cross member 5 is connected to the floor tunnel portion 10 which is a portion that divides the floor tunnel portion 10 into the front tunnel portion and the rear tunnel portion, similarly to the first cross member 4. In addition, a piping arrangement portion for arranging the piping 6 arranged to extend in the longitudinal direction of the vehicle body is provided on the lower side of the vehicle body of the floor tunnel portion 10.

  As described above, in the lower vehicle body structure of the vehicle according to the present embodiment, the floor tunnel portion 10 is formed on the floor panel 2 and is constructed between the left and right side sills 3 on the upper surface side of the floor panel 2 and intersects with the floor tunnel portion 10. The floor tunnel portion 10 includes a front tunnel portion 11 and a rear tunnel portion 12, and the rear end portion of the front tunnel portion 11 is on the vehicle body front side of the cross member 4. The front end portion of the rear tunnel portion 12 is connected to the vehicle body rear side of the cross member 4.

  As a result, the cross member 4 is installed between the side sills 3 without being divided into left and right by the floor tunnel portion 10, so that the collision load input to one of the side sills 3 at the time of a side collision is passed through the other member via the cross member 4. It can transmit to the side sill 3, and it can suppress that the side sill 3 penetrate | invades into the vehicle width direction inner side. When the cross member 4 is arranged above the floor tunnel portion 10 so as to be installed between the left and right side sills 3, it is necessary to increase the vehicle height in order to secure a vehicle compartment space. Since it is not necessary to divide by the cross member 4 and dispose the cross member 4 above the floor tunnel portion 10, the side sill 3 can be prevented from entering the vehicle width direction inward in the event of a side collision without increasing the vehicle height. can do.

  Further, the rear end portion of the front tunnel portion 11 is coupled along the front surface portion 4a and the front surface portion 4b of the cross member 4 on the vehicle body front side, and the front end portion of the rear tunnel portion 12 is on the vehicle body rear side of the cross member 4 By being coupled along the upper surface portion 4a and the rear surface portion 4c, the rigidity of the cross member 4 can be improved.

  In addition, the cross member 4 is a pipe 6 that is disposed at a portion that divides the floor tunnel portion 10 into a front tunnel portion 11 and a rear tunnel portion 12 so as to extend in the vehicle body front-rear direction on the vehicle body lower side of the floor tunnel portion 10. The piping arrangement | positioning part 4g, 4g 'which arranges is provided. Thereby, even when the floor tunnel portion 10 is divided by the cross member 4, the piping 6 can be routed without changing the layout of the piping 6 disposed on the vehicle body lower side of the floor tunnel portion 10. .

  Moreover, the piping arrangement | positioning parts 4g and 4g 'are the opening part 4g or recessed part 4g' formed in the front surface part 4b and the rear surface part 4c of the cross member 4, respectively. Thereby, the piping 6 can be arranged, suppressing the fall of the rigidity of the cross member 4 by forming only the opening part 4g or recessed part 4g 'of a size required in order to arrange the piping 6. FIG.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the scope of the present invention.

  As described above, according to the present invention, in a vehicle in which a floor tunnel portion is formed on the floor panel, it is possible to suppress the intrusion of the side sill into the vehicle width direction inward during a side collision without increasing the vehicle height. Therefore, it may be suitably used in the manufacturing industry of this type of vehicle.

DESCRIPTION OF SYMBOLS 1 Car body 2 Floor panel 3 Side sill 4, 5 Cross member 4g Opening part 4g 'Concave part 10 Floor tunnel part 11 Front side tunnel part 12 Rear side tunnel part

Claims (4)

A vehicle body lower part structure in which a floor tunnel portion that extends in the vehicle longitudinal direction and bulges upward on the vehicle body is formed at the vehicle width direction center side of the floor panel that forms the floor surface of the passenger compartment,
A pair of left and right side sills that are coupled to both ends of the floor panel in the vehicle width direction and extend in the longitudinal direction of the vehicle body;
A cross member that extends between the pair of left and right side sills on the upper surface side of the floor panel and extends in the vehicle width direction so as to intersect the floor tunnel portion;
The floor tunnel portion is divided in the vehicle longitudinal direction by the cross member, and includes a front tunnel portion disposed on the vehicle body front side of the cross member and a rear tunnel portion disposed on the vehicle body rear side of the cross member. A rear end portion of the front tunnel portion is coupled to a vehicle body front side of the cross member, and a front end portion of the rear tunnel portion is coupled to a vehicle body rear side of the cross member.
A lower body structure of a vehicle characterized by that. The rear end portion of the front tunnel portion is coupled to the upper surface portion and the front surface portion along the upper surface portion and the front surface portion of the cross member on the vehicle body front side,
The front end portion of the rear tunnel portion is coupled to the upper surface portion and the rear surface portion along the upper surface portion and the rear surface portion of the cross member on the vehicle body rear side,
The vehicle lower body structure according to claim 1, wherein: The cross member is arranged with piping arranged to extend in the vehicle front-rear direction on the lower side of the vehicle body of the floor tunnel portion at a portion dividing the floor tunnel portion into the front tunnel portion and the rear tunnel portion. It has a piping arrangement section that
The lower body structure of a vehicle according to claim 1 or 2, characterized in that The piping arrangement part is formed in the front part and the rear part of the cross member, respectively, or in the front part and the rear part of the cross member, respectively. It is a recess recessed upward from the lower end of the
The lower body structure of a vehicle according to claim 3.

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