Vehicle body structure

A vehicle body structure includes a battery pack provided below a floor panel, a floor tunnel provided on the floor panel and protruding upward, and a reinforcement member fixed to a lower surface of the floor panel below an apex section of the floor tunnel and extending in a vehicle width direction, wherein a routing member is provided between the reinforcement member and the floor tunnel.

CROSS-REFERENCE TO RELATED APPLICATION

Priority is claimed on Japanese Patent Application No. 2018-100964, filed May 25, 2018, the content of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a vehicle body structure.

Description of Related Art

In a vehicle body structure, a configuration in which a floor panel is provided between left and right extension side members (hereinafter, referred to as left and right side sills) and a battery pack is provided below the floor panel is known. In the battery pack, a battery (a plurality of cells) is accommodated in a battery case. In addition, a floor tunnel is provided on the floor panel, and the floor tunnel extends in a vehicle body forward/rearward direction while being open downward. The battery pack is disposed on an opening side of the floor tunnel (for example, see Japanese Unexamined Patent Application, First Publication No. 2006-224877).

SUMMARY OF THE INVENTION

However, the floor tunnel extends in the vehicle body forward/rearward direction while being open downward. Accordingly, it is difficult to secure rigidity for the floor tunnel with respect to an impact load input to a vehicle body in a vehicle width direction. That is, when an impact load is input from a side of the vehicle body due to a side collision of the vehicle body, the floor tunnel (i.e., the vehicle body) is easily deformed. For this reason, in order to secure rigidity for the floor tunnel with respect to an impact load due to a side collision, for example, a reinforcement member such as a cross member or the like below the floor panel is required.

However, in a vehicle body including a battery pack (i.e., the battery) below the floor panel, a large capacity for the battery is preferably secured. For this reason, in a state in which a large capacity for the battery is secured, it is difficult to dispose a reinforcement member such as a cross member or the like below the floor panel.

An aspect of the present invention is directed to providing a vehicle body structure capable of minimizing deformation of a vehicle body (a vehicle body structure) with respect to a side collision and in which a larger capacity for a battery is able to be secured.

(1) A vehicle body structure according to the present invention includes a battery pack provided below a floor panel; a floor tunnel provided on the floor panel and protruding upward; and a reinforcement member fixed to a lower surface of the floor panel below an apex section of the floor tunnel and extending in a vehicle width direction, wherein a routing member is provided between the reinforcement member and the floor tunnel.

According to the aspect of the above-mentioned (1), the floor panel is provided below the apex section of the floor tunnel, and the reinforcement member is provided on the lower surface of the floor panel. An opening section of a lower end portion of the floor tunnel can be connected to the reinforcement member. Accordingly, rigidity of the floor tunnel with respect to an impact load in the vehicle width direction can be secured. Accordingly, when a load is input from a side of the vehicle body due to a side collision, deformation of the vehicle body (a vehicle body structure), in particular, deformation of the floor tunnel can be suppressed.

In addition, a space is formed between the reinforcement member and the floor tunnel. The routing member is provided in the space. Accordingly, the space between the reinforcement member and the floor tunnel can be effectively used, and space efficiency of the vehicle body can be improved. That is, rigidity of the floor tunnel can be secured without providing a cross member on a lower surface of the floor panel. Accordingly, a space below the floor panel can be enlarged and a large capacity for a battery pack (i.e., a battery) can be secured.

(2) In the aspect of the above-mentioned (1), the routing member may be fixed to the reinforcement member.

According to the aspect of the above-mentioned (2), when the routing member is fixed to the reinforcement member, the routing member can be easily assembled to the vehicle body while being attached to the reinforcement member. In addition, when the routing member is provided on the reinforcement member, the reinforcement member can also function as a member configured to support the routing member. In other words, the member configured to support the routing member can also function as the reinforcement member. Accordingly, an attachment strength or support strength of the routing member can be improved without increasing the number of members configured to support the routing member.

(3) In the aspect of the above-mentioned (1) or (2), a cross member extending in the vehicle width direction may be provided in the battery pack, and the reinforcement member may be disposed above the cross member.

According to the aspect of the above-mentioned (3), the cross member is provided in the battery pack, and the reinforcement member is provided above the cross member. Accordingly, strength of the floor tunnel with respect to the impact load in the vehicle width direction can be improved by the cross member and the reinforcement member. Accordingly, when an impact load is input from a side of the vehicle body due to a side collision, the impact load can be supported by the cross member and the reinforcement member.

In addition, when the impact load is supported by the cross member and the reinforcement member, an influence of the impact load on attachment of the routing member can be minimized.

(4) In the aspect of any one of the above-mentioned (1) to (3), the routing member may be constituted by: a cooling pipeline configured to cool a driving source of a vehicle body rear section; and an electrical wire configured to supply electric power to the driving source, and the electrical wire may be disposed on a side closer to a central in the vehicle width direction compared to the cooling pipeline.

According to the aspect of the above-mentioned (4), the electrical wire is located (disposed) on the side closer to a central in the vehicle width direction compared to the cooling pipeline. Accordingly, the electrical wire can be separated from the side collision position. Accordingly, when the impact load is input from a side of the vehicle body due to the side collision, in particular, transmission of the impact load to the electrical wire can be minimized, and deformation of the electrical wire can be suppressed.

(5) In the aspect of any one of the above-mentioned (1) to (4), an over-tunnel reinforcement member disposed above the floor tunnel and fixed to an upper surface of the floor panel may be provided, and the over-tunnel reinforcement member and the reinforcement member may be fixed with each other via the floor panel.

According to the aspect of the above-mentioned (5), the over-tunnel reinforcement member is disposed above the floor tunnel and the over-tunnel reinforcement member and the reinforcement member are fixed together (collectively) via the floor panel. Accordingly, the over-tunnel reinforcement member can be strongly supported by a reinforcement member. That is, a coupling strength of the over-tunnel reinforcement member can be improved, and a strength of the over-tunnel reinforcement member with respect to the impact load due to the side collision can be improved.

Accordingly, when the impact load is input from a side of the vehicle body due to the side collision, deformation of the vehicle body (in particular, the floor tunnel) can be more appropriately suppressed.

(6) In the aspect of any one of the above-mentioned (1) to (5), the vehicle body structure may include a driving source provided on the vehicle body rear section; and a cooling apparatus provided on a vehicle body front section and configured to cool the driving source.

According to the aspect of the above-mentioned (6), the driving source is provided on the vehicle body rear section and the cooling apparatus is provided on the vehicle body front section. The driving source is cooled by the cooling apparatus. Accordingly, there is a need to extend a pipeline configured to cool the driving source in the vehicle body forward/rearward direction.

Here, rigidity of the floor tunnel with respect to the impact load in the vehicle width direction is secured by the reinforcement member. Further, a space is secured between the floor tunnel and the reinforcement member. Since the pipeline is disposed in the space, the pipeline can extend in the vehicle body forward/rearward direction.

Accordingly, a large space below the floor panel can be secured. Accordingly, in a state in which a capacity of the battery is largely secured, the pipeline can extend in the vehicle body forward/rearward direction, and the driving source and the cooling apparatus can be connected by the pipeline.

According to the aspect of the present invention, the opening section of the floor tunnel is connected to the reinforcement member, and the routing member is provided in the space between the reinforcement member and the floor tunnel. Accordingly, deformation of the vehicle body (a vehicle body structure) with respect to the side collision can be suppressed, and further, a large capacity of the battery can be secured.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, an arrow FR indicates a forward direction with respect to a vehicle, an arrow UP indicates an upward direction with respect to the vehicle, and an arrow LH indicates a leftward direction with respect to the vehicle.

FIG. 1is a schematic side view showing a state in which a vehicle10according to the embodiment is seen from a side.FIG. 2is a perspective view showing a vehicle body structure11of the vehicle10according to the embodiment from above of an inclined left side of a rear section.FIG. 3is a plan view showing a lower structure12of the vehicle10according to the embodiment.

As shown inFIG. 1toFIG. 3, for example, while an electric automobile is exemplified as the vehicle10, a configuration of the present invention can also be applied to another vehicle such as a hybrid automobile or the like.

The vehicle10includes the vehicle body structure11that constitutes a vehicle skeleton section or the like. The vehicle body structure11includes the lower structure12, a driving source50and a cooling apparatus60. The lower structure12constitutes a lower section of the vehicle body structure11, the driving source50is provided on a rear end portion (a vehicle body rear section)12a, and the cooling apparatus60is provided on a front end portion (a vehicle body front section)12b.

Specifically, the lower structure12includes a left side sill14and a right side sill14, a floor panel16that bridges between the left and right side sills14, and a plurality of floor cross members34,35and36disposed on an upper surface side of the floor panel16.

In addition, the lower structure12includes a battery pack28provided below the floor panel16, a battery45provided in the battery pack28, a lower reinforcement member (a reinforcement member)72, a pipeline fixing member74and an over-tunnel reinforcement member76. The lower reinforcement member72and the pipeline fixing member74are shown inFIG. 4.

The left and right side sills14are disposed on left and right side portions of a lower end side of the vehicle10, and extend in a forward/rearward direction of the vehicle10. The floor panel16forms a floor section of a passenger compartment by having both end portions in a vehicle width direction bridge between the left and right side sills14.

The floor cross members34,35and36extend in the vehicle width direction, and both end portions in an extension direction are coupled to the left and right side sills14. The floor cross members34,35and36are disposed to be separated in the vehicle body forward/rearward direction.

In the vehicle10, for example, a driver seat31and a passenger seat32installed in the passenger compartment are attached to the two floor cross members34and35of a front side of the vehicle body. In addition, a rear seat33installed in the passenger compartment is attached to the floor cross member36on a rear side of the vehicle body.

The floor cross members34,35and36will be described below in detail. Further, the floor cross members34,35and36are similar members, and hereinafter, the floor cross member35will be described in detail and detailed description of the floor cross members34and36will be omitted.

FIG. 4is a plan view showing a state in which the floor panel16is removed from the lower structure12according to the embodiment.

As shown inFIG. 1andFIG. 4, the battery pack28that bridges between the left and right side sills14is provided between the left and right side sills14and below the floor panel16. For example, an intelligent power unit (IPU) or the like is included in the battery pack28. The IPU is obtained by integrating a power control unit (PCU) configured to control selection of a drive mode or regenerative deceleration according to traveling circumstances and a battery residual quantity of the vehicle10and the battery45.

FIG. 5is a cross-sectional view taken along line V-V inFIG. 3of the lower structure12according to the embodiment.

As shown inFIG. 1andFIG. 5, the battery pack28includes a battery case41, a plurality of case cross members (cross members)42,43and44and the battery45(a plurality of cells46).

In the battery case41, a left side portion is attached to the left side sill14via a left side frame48, and a right side portion is attached to the right side sill14via a right side frame48. In addition, a case apex section41aof the battery case41is connected to the floor panel16via a plurality of connecting members49.

The plurality of case cross members42,43and44are disposed in the battery case41at intervals in the vehicle body forward/rearward direction, and extend in the vehicle width direction.

The case cross members42,43and44are similar members, and hereinafter, the case cross member43will be described in detail and detailed description of the case cross members42and44will be described.

A lower end portion of the case cross member43is coupled to a case bottom section41bof the battery case41. In addition, a left end portion of the case cross member43is coupled to a case left sidewall41cof the battery case41. A right end portion of the case cross member43is coupled to a case right sidewall41dof the battery case41.

Further, an upper end portion43aof the case cross member43is connected to the case apex section41aof the battery case41via the plurality of connecting members49. The case cross member43has a center concave section43bat a center in the vehicle width direction. The center concave section43bis recessed in a U shape directed downward from the upper end portion43aof the case cross member43.

In this state, the case cross member43is disposed below the floor cross member35. In addition, the case cross member42is disposed below the floor cross member34(seeFIG. 3). Further, the case cross member44is disposed below the floor cross member36(seeFIG. 3).

The driving source50is provided on a vehicle body rear side of the battery pack28(i.e., the rear end portion12aof the lower structure12). For example, a motor50is exemplified as the driving source50. That is, the vehicle10is a rear driving structure in which a rear wheel18is driven by the motor50.

The cooling apparatus60is provided on a vehicle body front side of the battery pack28(i.e., the front end portion12bof the lower structure12). For example, a radiator61or a condenser62is exemplified as the cooling apparatus60. Cooling water is cooled by the radiator61, and the motor50or the PCU is cooled by the cooling water. In addition, coolant in an air-conditioning apparatus is cooled by the condenser62.

Returning toFIG. 1andFIG. 4, the motor50or the PCU is connected to, for example, the radiator61by a cooling pipeline (a routing member)52. The cooling pipeline52includes a first cooling pipeline53and a second cooling pipeline54. The first cooling pipeline53is a pipeline formed in, for example, a tubular shape, and configured to guide the cooling water cooled by the radiator61from the radiator61to the motor50, the PCU, or the like. The second cooling pipeline54is a pipeline formed in, for example, a tubular shape, and configured to guide the cooling water from the motor50or the PCU to the radiator61.

The cooling water cooled by the radiator61is guided to the motor50, the PCU, or the like, through the first cooling pipeline53, and the motor50, the PCU, or the like, is cooled by the cooling water. The cooling water that has cooled the motor50, the PCU, or the like, is guided to the radiator61through the second cooling pipeline54.

The motor50is connected to, for example, the battery45by a high voltage electrical wire (a routing member, an electrical wire)56. When the motor50is connected to the battery45by the high voltage electrical wire56, electric power is supplied to the motor50from the battery45.

FIG. 6is an enlarged cross-sectional view of a portion VI inFIG. 5of the lower structure12according to the embodiment.

As shown inFIG. 5andFIG. 6, the first cooling pipeline53, the second cooling pipeline54and the high voltage electrical wire56are disposed above the battery pack28and below a floor tunnel66(to be described below). The first cooling pipeline53, the second cooling pipeline54and the high voltage electrical wire56extend in the vehicle body forward/rearward direction at a center in the vehicle width direction (seeFIG. 4).

The first cooling pipeline53is disposed on a right side of the center in the vehicle width direction. The second cooling pipeline54is disposed on a left side of the center in the vehicle width direction. The first cooling pipeline53and the second cooling pipeline54are disposed with an interval therebetween in the vehicle width direction. Further, the high voltage electrical wire56is disposed between the first cooling pipeline53and the second cooling pipeline54. That is, the high voltage electrical wire56is positioned (disposed) on the side closer to the center in the vehicle width direction compared to the first cooling pipeline53and the second cooling pipeline54.

The floor panel16includes a left floor panel section64, a right floor panel section65and the floor tunnel66. The left floor panel section64is coupled to the left side sill14and formed integrally with the floor tunnel66. The right floor panel section65is coupled to the right side sill14and formed integrally with the floor tunnel66.

The floor tunnel66is integrally provided on a right side of the left floor panel section64and a left side of the right floor panel section65. The floor tunnel66protrudes upward from the right side of the left floor panel section64and the left side of the right floor panel section65and extends in the vehicle body forward/rearward direction.

The floor tunnel66has a tunnel apex section66a, a left tunnel inclined wall66band a right tunnel inclined wall66c. The tunnel apex section66ais disposed above the left floor panel section64and the right floor panel section65.

The left tunnel inclined wall66bextends downward and toward a leftward side in an inclined shape from a left side66dof the tunnel apex section66ato a right side of the left floor panel section64. The right tunnel inclined wall66cextends downward and toward a leftward side in an inclined shape from a right side66eof the tunnel apex section66ato a left side of the right floor panel section65.

That is, the floor tunnel66protrudes upward from the right side of the left floor panel section64and the left side of the right floor panel section65in a U-shaped cross section, and extends in the vehicle body forward/rearward direction.

FIG. 7is an enlarged cross-sectional view of a main part inFIG. 3of the lower structure12according to the embodiment.

As shown inFIG. 3andFIG. 7, the floor cross member35includes a left cross member section37and a right cross member section38. The left cross member section37bridges between the left side sill14and the floor tunnel66and extends in the vehicle width direction.

The left cross member section37has a left member protruding section37a, a left member front protruding section37band a left member rear protruding section37c. The left member protruding section37aprotrudes upward from the left floor panel section64in a U-shaped cross section. The left member front protruding section37boverhangs from a front side of the left member protruding section37atoward a front side of the vehicle body along an upper surface64aof the left floor panel section64. The left member rear protruding section37coverhangs from a rear side of the left member protruding section37atoward a rear side of the vehicle body along the upper surface64aof the left floor panel section64.

When the left member front protruding section37band the left member rear protruding section37care coupled to the upper surface64aof the left floor panel section64, the left cross member section37is fixed to the upper surface64aof the left floor panel section64.

The right cross member section38bridges between the right side sill14and the floor tunnel66and extends in the vehicle width direction.

The right cross member section38has a right member protruding section38a, a right member front protruding section38band a right member rear protruding section38c. The right member protruding section38aprotrudes upward from the right floor panel section65in a U-shaped cross section. The right member front protruding section38boverhangs from a front side of the right member protruding section38atoward a front side of the vehicle body along an upper surface65aof the right floor panel section65. The right member rear protruding section38coverhangs from a rear side of the right member protruding section38atoward a rear side of the vehicle body along the upper surface65aof the right floor panel section65.

When the right member front protruding section38band the right member rear protruding section38care coupled to the upper surface65aof the right floor panel section65, the right cross member section38is fixed to the upper surface65aof the right floor panel section65.

FIG. 8is an enlarged cross-sectional view of the main part inFIG. 4of the lower structure according to the embodiment.

As shown inFIG. 6andFIG. 8, the lower reinforcement member72is provided below the floor cross member35and below the floor tunnel66. The lower reinforcement member72is formed in a panel shape using a plate member having a rectangular shape when seen in a plan view. The lower reinforcement member72includes a lower reinforcement central section81, a lower reinforcement left side portion82and a lower reinforcement right side portion83.

The lower reinforcement left side portion82is fixed to a lower surface64bof the left floor panel section64on a right side through, for example, welding or the like. The lower reinforcement right side portion83is fixed to a lower surface65bof the right floor panel section65on a left side through, for example, welding or the like.

The lower reinforcement member72bridges between the lower surface64bof the left floor panel section64on the right side and the lower surface65bof the right floor panel section65on the left side. Accordingly, an opening section67of a lower end portion of the floor tunnel66can be connected to the lower reinforcement member72.

In this state, the lower reinforcement central section81is disposed below the floor tunnel66. In addition, the lower reinforcement left side portion82is disposed below a right end portion of the left cross member section37.

A front end portion82aof the lower reinforcement left side portion82overlaps a right end portion37d(seeFIG. 7) of the left member front protruding section37bvia a right side of the left floor panel section64. A rear end portion82bof the lower reinforcement left side portion82overlaps a right end portion37e(seeFIG. 7) of the left member rear protruding section37cvia a right side of the left floor panel section64.

In addition, the lower reinforcement right side portion83is disposed below a left end portion of the right cross member section38.

A front end portion83aof the lower reinforcement right side portion83overlaps a left end portion38d(seeFIG. 7) of the right member front protruding section38bvia a left side of the right floor panel section65. A rear end portion83bof the lower reinforcement right side portion83overlaps a left end portion38e(seeFIG. 7) of the right member rear protruding section38cvia a left side of the right floor panel section65.

In this state, the lower reinforcement member72is fixed to the lower surfaces64band65bof the floor panel16below the tunnel apex section66aof the floor tunnel66, and further, extends in the vehicle width direction. In addition, the lower reinforcement member72is disposed above the center concave section43bof the case cross member43.

As described inFIG. 5, the case cross member43is provided in the battery pack28and the lower reinforcement member72is provided above the case cross member43. Accordingly, strength of the floor tunnel66with respect to an impact load F1in the vehicle width direction generated due to a side collision can be improved by the case cross member43and the lower reinforcement member72. Accordingly, when the impact load F1is input from a side of the vehicle body due to the side collision, the impact load F1can be supported by the case cross member43and the lower reinforcement member72.

In addition, when the impact load F1is supported by the case cross member43and the lower reinforcement member72, it is possible to minimize an influence of the impact load F1applied to an attachment state of the first cooling pipeline53and the second cooling pipeline54or a supporting state of the high voltage electrical wire56.

The pipeline fixing member74is provided on an upper surface72aof the lower reinforcement member72.

Returning toFIG. 6andFIG. 8, the pipeline fixing member74has a fixed section85extending in the vehicle width direction, and an attachment section86protruding from the fixed section85toward a rear side of the vehicle body.

The fixed section85extends along the upper surface72aof the lower reinforcement member72in the vehicle width direction. A left end portion85aof the fixed section85extends upward in an inclined shape to be separated from the upper surface72aof the lower reinforcement member72along a second outer circumferential surface of the second cooling pipeline54. “The left end portion85aof the fixed section85” is referred to as “a fixed left end portion85a.”

The fixed left end portion85ais fixed to the second outer circumferential surface through, for example, brazing, while coming in contact with the second outer circumferential surface of the second cooling pipeline54.

A right end portion85bof the fixed section85extends upward in an inclined shape to be separated from the upper surface72aof the lower reinforcement member72along the first outer circumferential surface of the first cooling pipeline53. “The right end portion85bof the fixed section85” is referred to as “a fixed right end portion85b.” The fixed right end portion85bis fixed to the second outer circumferential surface through, for example, brazing, while coming in contact with the first outer circumferential surface of the first cooling pipeline53.

In the embodiment, while the example in which the fixed left end portion85ais fixed to the second outer circumferential surface of the second cooling pipeline54through brazing and the fixed right end portion85bis fixed to the first outer circumferential surface of the first cooling pipeline53through brazing has been described, there is no limitation thereto. As another example, for example, the above-mentioned portion may be fixed by another means such as an adhesive agent or the like.

The attachment section86protrudes from the fixed section85toward a rear side of the vehicle body. The attachment section86is fixed to the upper surface72aof the lower reinforcement member72by a fastening member.

Specifically, the attachment section86protrudes along the upper surface72aof the lower reinforcement member72and has an attachment hole. A nut87is welded to the upper surface of the attachment section86coaxially with the attachment hole. A bolt88is screwed to the nut87. Specifically, the bolt88is screwed to the nut87while passing through the attachment hole of the attachment section86from a lower surface72bof the lower reinforcement member72. Accordingly, the attachment section86(i.e., the pipeline fixing member74) is attached to the upper surface72aof the lower reinforcement member72.

Further, in the embodiment, while the bolt88and the nut87have been exemplified as a fastening member configured to fix the attachment section86to the upper surface72aof the lower reinforcement member72, there is no limitation thereto. As another example, for example, spot welding, a rivet, or the like, may be used.

Here, the fixed left end portion85ais fixed to the second outer circumferential surface of the second cooling pipeline54. In addition, the fixed right end portion85bis fixed to the first outer circumferential surface of the first cooling pipeline53. Accordingly, the first cooling pipeline53and the second cooling pipeline54are fixed to the upper surface72aof the lower reinforcement member72via the pipeline fixing member74. In this state, the first cooling pipeline53and the second cooling pipeline54are provided between the lower reinforcement member72and the floor tunnel66.

In this way, the first cooling pipeline53and the second cooling pipeline54are fixed to the upper surface72aof the lower reinforcement member72via the pipeline fixing member74. In this state, the lower reinforcement member72is attached to the lower surfaces64band65bof the floor panel16. Accordingly, the first cooling pipeline53and the second cooling pipeline54can be easily assembled to the lower structure12.

In addition, the first cooling pipeline53and the second cooling pipeline54are fixed to the upper surface72aof the lower reinforcement member72via the pipeline fixing member74, and the high voltage electrical wire56is supported by the lower reinforcement member72. Accordingly, the lower reinforcement member72may also function as a member configured to support the first cooling pipeline53, the second cooling pipeline54and the high voltage electrical wire56.

That is, the member configured to support the first cooling pipeline53, the second cooling pipeline54and the high voltage electrical wire56may also function as the lower reinforcement member72. Accordingly, the attachment strength of the first cooling pipeline53and the second cooling pipeline54or the support strength of the high voltage electrical wire56can be improved with no increase of the member configured to support the first cooling pipeline53, the second cooling pipeline54and the high voltage electrical wire56.

Further, as shown inFIG. 5, the high voltage electrical wire56is disposed on the side closer to the center in the vehicle width direction compared to the first cooling pipeline53and the second cooling pipeline54. Accordingly, the high voltage electrical wire56can be separated from a portion to which the impact load F1due to the side collision is input (for example, the left side sill14). Accordingly, when the impact load F1is input from a side of the vehicle body due to the side collision, in particular, transmission of the impact load F1to the high voltage electrical wire56can be minimized, and deformation of the high voltage electrical wire56can be suppressed.

As shown inFIG. 6andFIG. 7, the over-tunnel reinforcement member76is provided above the floor tunnel66and the floor cross member35. The over-tunnel reinforcement member76has an upper reinforcement central section91, an upper reinforcement front protruding section92and an upper reinforcement rear protruding section93.

The upper reinforcement central section91is provided above the floor tunnel66. The upper reinforcement central section91has an upper central area91a, an upper left side area91band an upper right side area91c. The upper central area91ais disposed above, for example, the floor tunnel66(i.e., the tunnel apex section66a, the left tunnel inclined wall66band the right tunnel inclined wall66c) at an interval.

The upper left side area91bextends from a left side of the upper central area91atoward a left side in the vehicle width direction. The upper left side area91bis formed along a right end portion of the left member protruding section37a. The upper right side area91cextends from a right side of the upper central area91atoward a right side in the vehicle width direction. The upper right side area91cis formed along a left end portion of the right member protruding section38a.

The upper reinforcement front protruding section92overhangs from a front side of the upper reinforcement central section91toward a front side of the vehicle body along the floor panel16. The upper reinforcement front protruding section92is formed along the floor tunnel66(i.e., the tunnel apex section66a, the left tunnel inclined wall66band the right tunnel inclined wall66c), the right end portion37dof the left member front protruding section37b, and the left end portion38dof the right member front protruding section38b.

The upper reinforcement front protruding section92has a left end portion92athat overlaps the right end portion37dof the left member front protruding section37bfrom above. A bolt95passes through the left end portion92aof the upper reinforcement front protruding section92, the right end portion37dof the left member front protruding section37b, the right side of the left floor panel section64and the front end portion82aof the lower reinforcement left side portion82and is screwed to a nut96. That is, the left end portion92aof the upper reinforcement front protruding section92and the front end portion82aof the lower reinforcement left side portion82are fastened by the bolt95and the nut96via the right side of the left floor panel section64.

In addition, the upper reinforcement front protruding section92has a right end portion92bthat overlaps the left end portion38dof the right member front protruding section38bfrom above. The bolt95passes through the right end portion92bof the upper reinforcement front protruding section92, the left end portion38dof the right member front protruding section38b, the left side of the right floor panel section65and the front end portion83aof the lower reinforcement right side portion83and is screwed to the nut96. That is, the right end portion92bof the upper reinforcement front protruding section92and the front end portion83aof the lower reinforcement right side portion83are fastened by the bolt95and the nut96via the left side of the right floor panel section65.

The upper reinforcement rear protruding section93overhangs from the rear side of the upper reinforcement central section91toward the rear side of the vehicle body along the floor panel16. The upper reinforcement front protruding section92is formed along the floor tunnel66(i.e., the tunnel apex section66a, the left tunnel inclined wall66band the right tunnel inclined wall66c), the right end portion37eof the left member rear protruding section37c, and the left end portion38eof the right member rear protruding section38c.

The upper reinforcement rear protruding section93has a left end portion93athat overlaps the right end portion37eof the left member rear protruding section37cfrom above. The bolt95passes through the left end portion93aof the upper reinforcement rear protruding section93, the right end portion37eof the left member rear protruding section37c, the right side of the left floor panel section64and the rear end portion82bof the lower reinforcement left side portion82and is screwed to the nut96. That is, the left end portion93aof the upper reinforcement rear protruding section93and the rear end portion82bof the lower reinforcement left side portion82are fastened by the bolt95and the nut96via the right side of the left floor panel section64.

The upper reinforcement rear protruding section93has a right end portion93bthat overlaps the left end portion38eof the right member rear protruding section38cfrom above. The bolt95passes through the right end portion93bof the upper reinforcement rear protruding section93, the left end portion38eof the right member rear protruding section38c, the left side of the right floor panel section65and the rear end portion83bof the lower reinforcement right side portion83and is screwed to the nut96. That is, the right end portion93bof the upper reinforcement rear protruding section93and the rear end portion83bof the lower reinforcement right side portion83are fastened by the bolt95and the nut96via the left side of the right floor panel section65.

Accordingly, the over-tunnel reinforcement member76and the lower reinforcement member72are fixed by the plurality of bolts95and nuts96with the floor panel16interposed therebetween. In this state, the over-tunnel reinforcement member76is disposed above the floor tunnel66, and further, is fixed to an upper surface16aof the floor panel16by the plurality of bolts95and nuts96via the floor cross member35.

In the embodiment, while the example in which the over-tunnel reinforcement member76is fixed to the upper surface16aof the floor panel16by the bolt95and the nut96has been described, there is no limitation thereto. As another example, for example, the over-tunnel reinforcement member76can also be fixed to the upper surface16aof the floor panel16through spot welding, a rivet, or the like.

In this way, the over-tunnel reinforcement member76is provided above the floor tunnel66, and the over-tunnel reinforcement member76and the lower reinforcement member72are fixed together (collectively) via the floor panel16. Accordingly, the over-tunnel reinforcement member76can be strongly supported by the lower reinforcement member72. That is, coupling strength of the over-tunnel reinforcement member76can be improved, and strength of the over-tunnel reinforcement member76with respect to the impact load due to the side collision can be improved.

Accordingly, when the impact load F1is input from a side of the vehicle body due to the side collision, deformation of the lower structure12(in particular, the floor tunnel66of the vehicle body) can be more appropriately suppressed.

Incidentally, the vehicle10includes the motor50on the rear end portion12aof the lower structure12, and includes the radiator61or the condenser62on the front end portion12bof the lower structure12. The motor50is cooled by the radiator61. The first cooling pipeline53and the second cooling pipeline54configured to cool the motor50extend in the vehicle body forward/rearward direction.

Here, for example, rigidity of the floor tunnel66with respect to the impact load F1in the vehicle width direction generated due to the side collision can be secured by the lower reinforcement member72. Further, a space98is secured between the floor tunnel66and the lower reinforcement member72. Since the first cooling pipeline53and the second cooling pipeline54are disposed in the space98, the first cooling pipeline53and the second cooling pipeline54can extend in the vehicle body forward/rearward direction.

In addition, since the high voltage electrical wire56is provided in the space98, the high voltage electrical wire56can extend in the vehicle body forward/rearward direction.

Accordingly, a large space99below the floor panel16can be secured. Accordingly, in a state in which a capacity of the battery45is largely secured, the first cooling pipeline53and the second cooling pipeline54can extend in the vehicle body forward/rearward direction, and the radiator61can be connected to the motor50by the first cooling pipeline53and the second cooling pipeline54. Further, the battery45can be connected to the motor50by the high voltage electrical wire56.

Further, the floor panel16is provided below the tunnel apex section66aof the floor tunnel66. In addition, the lower reinforcement member72is provided on the lower surfaces64band65bof the floor panel16. That is, the lower reinforcement member72bridges between the lower surface64bof the left floor panel section64on the right side and the lower surface65bof the right floor panel section65on the left side. Accordingly, the opening section67of the lower end portion of the floor tunnel66is connected to the lower reinforcement member72in the vehicle width direction.

Accordingly, rigidity of the floor tunnel66with respect to the impact load F1in the vehicle width direction generated due to the side collision is secured. Accordingly, when the impact load F1is input from a side of the vehicle body due to the side collision, deformation of the lower structure12(in particular, the floor tunnel66) can be suppressed.

In addition, the space98is formed between the lower reinforcement member72and the floor tunnel66, and the first cooling pipeline53, the second cooling pipeline54and the high voltage electrical wire56are provided in the space98. Accordingly, the space98between the lower reinforcement member72and the floor tunnel66can be effectively used.

That is, space efficiency of the lower structure12can be improved. Accordingly, rigidity of the floor tunnel66can be secured without individually providing cross members for reinforcement on the lower surfaces64band65bof the floor panel16. Accordingly, the space98below the floor panel16can be largely formed, and a large capacity for the battery pack28(i.e., the battery45) can be secured.

Further, the technical scope of the present invention is not limited to the above-mentioned embodiment and various modifications may be made without departing from the scope of the present invention.

For example, in the embodiment, while the example in which the driving source50is provided on the rear end portion12aof the lower structure12and the cooling apparatus60is provided on the front end portion12bof the lower structure12has been described, there is no limitation thereto. As another example, for example, the driving source50may be provided on the front end portion12bof the lower structure12, and the cooling apparatus60may also be provided on the rear end portion12aof the lower structure12.

In addition, in the embodiment, while the example in which three of the first cooling pipeline53, the second cooling pipeline54and the high voltage electrical wire56serving as routing members are disposed in the space98between the floor tunnel66and the lower reinforcement member72has been described, there is no limitation thereto. As another example, the same effect as that of the embodiment is obtained even when routing members other than the three members are disposed in the space98.