JP7447598B2 - car body floor structure - Google Patents

Description

The present invention relates to a vehicle body floor structure, and particularly to a vehicle body floor structure for an electric vehicle such as an electric vehicle or a hybrid vehicle.

Electric vehicles are equipped with electrical equipment such as a motor, an inverter, and a battery for driving the vehicle. Furthermore, in electric vehicles, electric wires such as power cables and wire harnesses are routed along vehicle body panels such as floor panels and connected to various electrical devices. Patent Document 1 discloses related technology.

JP2012-183903

By the way, some vehicle body floor structures of electric vehicles have electric wires connected to a battery for driving the vehicle passing through an electric wire penetration part of a floor tunnel. In this structure, a reinforcing structure is sometimes provided in the wire penetration portion in order to prevent the wire penetration portion from being significantly deformed by the load at the time of a vehicle collision, which has been a factor in increasing the weight of the vehicle.

An object of the present invention is to reduce the weight of a vehicle by reducing the weight of a reinforcing structure for a wire penetration portion.

In the vehicle body floor structure according to one aspect of the present invention, the cross member disposed near the electric wire penetration portion of the floor tunnel extends continuously in the vehicle width direction from one side to the other side in the vehicle width direction.

According to the above vehicle body floor structure, it is possible to reduce the weight of the vehicle by reducing the weight of the reinforcing structure of the wire penetration portion.

FIG. 1 is a plan view of a vehicle floor structure according to an embodiment. 2 is a sectional view taken along line II-II in FIG. 1. FIG. FIG. 2 is a perspective view of the vehicle floor structure of FIG. 1; FIG. 3 is a perspective view of a vehicle body floor structure according to a comparative example. FIG. 3 is a sectional view corresponding to FIG. 2 of a vehicle body floor structure according to a comparative example. It is a figure which shows the water-preventing structure of the wire harness fixture based on a comparative example.

Hereinafter, the vehicle body floor structure of the vehicle V according to the embodiment will be described with reference to the drawings. In each figure, FW and RR indicate front and rear in the longitudinal direction of the vehicle, LH and RH indicate left and right in the vehicle width direction, and UP and DN indicate upper and lower in the vehicle vertical direction, respectively. In the following description, the front and rear in the longitudinal direction of the vehicle, and the upper and lower sides in the vertical direction of the vehicle are simply referred to as "front of the vehicle," "rear of the vehicle," "upper of the vehicle," and "lower of the vehicle," respectively. Further, elements having the same functions are designated by the same reference numerals, and redundant explanations will be omitted.

Referring to FIGS. 1 to 3, the vehicle V according to the embodiment is, for example, an electric vehicle (EV) that runs using only an electric motor as a driving force source. A motor room (not shown) is provided at the front of the vehicle V, and a vehicle drive motor, a speed reducer, a power delivery module, an inverter, an engine dedicated to power generation, and the like are mounted inside the motor room. In the vehicle V, a high voltage (for example, 350V) vehicle drive battery 2 is mounted on the floor panel 1 .

As shown in FIGS. 1 and 2, the floor panel 1 is a plate-shaped member that constitutes the floor surface of a vehicle interior, and partitions a vehicle interior space C and a vehicle exterior space O at the lower portion of the vehicle body. The front edge of the floor panel 1 is joined to the lower end of a dashboard (not shown) that partitions a motor compartment and a vehicle compartment. The rear end edge of the floor panel 1 extends to the footwell of a rear seat (not shown) and is joined to the front end edge of a rear floor panel (not shown). The outer edges of the floor panel 1 in the vehicle width direction are joined to left and right side sills 3, respectively.

As shown in FIG. 1, the floor panel 1 includes a center floor panel 1A provided at the center in the vehicle width direction, and left and right side floor panels 1B provided on both outer sides of the center floor panel 1A in the vehicle width direction. has been done. The outer end in the vehicle width direction of the center floor panel 1A is joined to the inner end in the vehicle width direction of each side floor panel 1B.

A floor tunnel 4 extending in the longitudinal direction of the vehicle body is formed in the center floor panel 1A. The floor tunnel 4 is raised above the vehicle body and has a substantially inverted U-shaped cross section in a cross section perpendicular to the longitudinal direction of the vehicle body.

An exhaust pipe 5 (see FIG. 2) is arranged inside the floor tunnel 4 to guide and discharge exhaust gas from the engine toward the rear of the vehicle body. Further, inside the floor tunnel 4, in addition to the exhaust pipe 5, an electric wire W, which will be described later, is arranged so as to be inserted through a metal protection tube P.

As shown in FIGS. 1 and 3, front side member extensions 6 are provided between the floor tunnel 4 and the side sills 3, one on each side of the floor tunnel 4 in the vehicle width direction. The front side member extension 6 is a reinforcing member having a hat-shaped cross section extending in the longitudinal direction of the vehicle body, and is joined to the upper surface of the side floor panel 1B at the left and right flange portions 6f, respectively.

A first cross member 7 serving as a cross member and a second cross member 8 located rearward of the vehicle body from the first cross member 7 are provided behind the rear end portion 41 of the floor tunnel 4. The first cross member 7 and the second cross member 8 are reinforcing members each extending in the vehicle width direction and having a hat-shaped cross section, and are joined to the upper surface of the floor panel 1 at front and rear flange portions 7f and 8f, respectively. The upper surface 4a of the floor tunnel 4 is located at a height above the vehicle body than the upper surface 7a of the first cross member 7 and the upper surface 8a of the second cross member 8.

The first cross member 7 and the second cross member 8 each extend continuously in the vehicle width direction from one side to the other side in the vehicle width direction. That is, the first cross member 7 and the second cross member 8 are each made of a single member, and are not separated in the vehicle width direction by other members such as the floor tunnel 4, for example. In the illustrated example, the first cross member 7 and the second cross member 8 each extend substantially linearly along the vehicle width direction.

The outer end portions of the first cross member 7 and the second cross member 8 in the vehicle width direction are connected to the left and right side sills 3, respectively. The connection point between the first cross member 7 and the side sill 3 is located further forward of the vehicle body than the connection point between the center pillar and the side sill 3 (not shown). The connection point between the second cross member 8 and the side sill 3 is located near the connection point between the center pillar and the side sill 3 (not shown).

The first cross member 7 and the second cross member 8 are located under a front seat (not shown) and support the front and rear portions of the seat rail of the front seat, respectively. The first cross member 7 and the second cross member 8 are connected to left and right front side member extensions 6 at their left and right portions, respectively.

As shown in FIGS. 1 and 2, the battery 2 is disposed further rearward of the vehicle body than the rear end portion 41 of the floor tunnel 4. As shown in FIGS. The battery 2 includes a battery case 21 that is rectangular in plan view, a battery main body 22 housed in the battery case 21, a junction box 23 provided on the top surface of the battery case 21, and the like.

As shown in FIG. 1, two front brackets 24 are provided at the front edge of the battery case 21, and two rear brackets 25 are provided at the rear edge of the battery case 21. The front brackets 24 are provided apart from each other in the vehicle width direction, and are each fastened and fixed to the upper surface 7a of the first cross member 7 using fasteners such as bolts. Similarly, the rear brackets 25 are provided spaced apart from each other in the vehicle width direction, and are each fastened and fixed to the upper surface 8a of the second cross member 8 using fasteners such as bolts.

A DC/DC converter 9, a cooling fan 10, and the like are arranged on the floor panel 1 at the rear of the vehicle body from the battery 2. The cooling fan 10 is connected to the battery case 21 via a duct 10a, and is driven by a fan motor to suck air inside the battery case 21 and discharge it to the outside.

An electric wire W such as a power cable is connected to the battery 2 . In this embodiment, the first electric wire _W1 is connected to the junction box 23 of the battery 2, and the second electric wire _W2 is connected to the DC/DC converter 9. The first electric wire W ₁ and the second electric wire W ₂ are each inserted into a metal protective tube P and routed inside the floor tunnel 4, and are provided at the rear end portion 41 of the floor tunnel 4. It passes through the wire penetration part T.

The wire penetration portion T is provided on the rear surface 4b of the floor tunnel 4. A first cross member 7 is disposed in the vicinity of the electric wire penetration portion T in a side view of the vehicle body, close to the rear surface 4b of the floor tunnel 4. The rear surface 4b of the floor tunnel 4 is formed into a flat surface facing toward the rear of the vehicle body. That is, the first electric wire W ₁ , the second electric wire W ₂ , and the protection tube P extend generally along the longitudinal direction of the vehicle body in the electric wire penetration portion T, and penetrate the rear surface 4b of the floor tunnel 4 at approximately right angles. .

In the wire penetration portion T, a through hole h is formed which communicates the vehicle exterior space O and the vehicle interior space C. A grommet G is attached to the through hole h, and two protective tubes P are inserted through the grommet G. A first electric wire W ₁ and a second electric wire W ₂ extend from the terminal opening Pa of each protection tube P located in the vehicle interior space C, respectively.

As shown in FIG. 2, a sensor unit 11 of the airbag system is provided above the vehicle body in a portion of the first electric wire _W1 and the second electric wire _W2 that extends from the wire penetration part T to the junction box 23. . The sensor unit 11 includes an acceleration sensor (G sensor) for impact detection, a safing sensor, and the like. The sensor unit 11 is supported by a cover member 42 attached to the upper part of the floor tunnel 4, and is arranged near the center of gravity of the vehicle V. A wire harness H is connected to the sensor unit 11. This wire harness H is wired on the floor panel 1 and connected to each airbag module, other sensors, and the like.

As shown in FIGS. 1 to 3, in this embodiment, the rear surface 4b of the floor tunnel 4 and the front surface 7b of the first cross member 7 form a groove-shaped recess 12 extending in the vehicle width direction between them. ing. A wire harness H is arranged within the recess 12. The inner surface of the recess 12 has a substantially U-shaped shape that opens upward from the vehicle body when viewed in the vehicle width direction, and a portion of the inner surface on the rear side of the vehicle body is formed by the front surface 7b of the first cross member 7. , the front side of the vehicle body is constituted by the rear surface 4b of the floor tunnel 4. Therefore, the rear surface 4b of the floor tunnel 4 and the front surface 7b of the first cross member 7 function as a guide when the wire harness H is placed in the recess 12, and the recess 12 serves as a guide for the wire harness H placed inside the recess 12. Functions as a holder to hold.

In the illustrated example, the wire harness H runs near the rear end 41 of the floor tunnel 4 at a height above the top surface of the floor panel 1 and below the top surface 7a of the first cross member 7. The cables are laid across the vehicle widthwise from the left to the right. The wire harness H is inserted into a corrugated tube 13 for protecting the wire harness H, and is fixed to the front surface 7b of the first cross member 7 using, for example, a resin clamp 14.

The effects of this embodiment will be explained below.

(1) In this embodiment, as shown in FIGS. 1 to 3, the first cross member 7 disposed near the electric wire penetration portion T is continuous in the vehicle width direction from one side to the other side in the vehicle width direction. It is extending. Therefore, compared to the case where the first cross member 7 is divided by the floor tunnel 4 as shown in FIG. The side collision load is easily transmitted directly (not via the floor tunnel 4) to the other side in the vehicle width direction. This suppresses deformation of the floor tunnel 4 (that is, deformation of the wire penetration portion T) due to a side impact load, so that the reinforcing structure of the wire penetration portion T can be reduced in weight or omitted.

(2) In addition, in the comparative example, as shown in FIG. 4, it was necessary to install a structure 7C in the floor tunnel 4 to promote load transmission between the left and right divided cross members 7A and 7B. . In contrast, in the present embodiment, the first cross member 7 extends continuously in the vehicle width direction, and the load is more easily transmitted between the left and right parts of the first cross member 7. Therefore, the structure 7C can be omitted or can be made lighter than the comparative example.

(3) Furthermore, in the comparative example, as shown in FIG. 4, there is a mating surface between the split cross members 7A, 7B and the floor tunnel 4, and there is a mating surface between the split cross members 7A and 7B and the floor tunnel 4, and there is a mating surface where metal seals S and other materials are used to ensure watertightness of the vehicle body. It was necessary to install parts. In contrast, in the present embodiment, the first cross member 7 extends continuously in the vehicle width direction from one side to the other side, and the above-mentioned mating surface does not exist, so that the watertightness of the vehicle body is ensured. A member for this purpose can be omitted.

(4) In this embodiment, as shown in FIG. 1, the battery 2 is fixed to the first cross member 7. In the comparative example, the deformation of the floor tunnel 4 due to the side collision load has a relatively large effect on the positional relationship between the divided cross members 7A and 7B. On the other hand, since the first cross member 7 extends continuously in the vehicle width direction, the positional relationship between the left side portion and the right side portion of the first cross member 7 is hardly affected by the deformation of the floor tunnel 4. That is, according to the configuration of the present embodiment, the relative displacement between the left side portion and the right side portion of the first cross member 7 at the time of a side collision can be suppressed more than the comparative example, and the first cross member 7 can be The load input from member 7 to battery 2 can be reduced.

(5) In this embodiment, as shown in FIGS. 1 to 3, a wire penetration portion T is provided on the rear surface 4b of the floor tunnel 4. Therefore, compared to the case where the wire penetration part T is provided on the upper surface 4a of the floor tunnel 4 as shown in FIG. can be made shorter. Further, by reducing the meandering width of the electric wire W, a space is created near the center of gravity of the vehicle V, and the degree of freedom in layout is improved. In addition, in FIG. 5, a solid line shows a comparative example, and a dashed-dotted line shows this embodiment.

(6) Furthermore, the amount of deformation of the rear surface 4b of the floor tunnel 4 at the time of a frontal collision is smaller than that of other parts of the floor tunnel 4. Therefore, by providing the wire penetration portion T on the rear surface 4b, the reinforcement structure around the wire penetration portion T can be reduced in weight or omitted.

(7) Furthermore, the electric wire W passes through the rear surface 4b of the floor tunnel 4 at an angle closer to a right angle than in the case where the electric wire penetration part T is provided on the upper surface 4a of the floor tunnel 4 as shown in FIG. . Therefore, even when the electric wire W having the same outer diameter passes through the through hole h, the size of the through hole h can be made smaller, and the reinforcing structure around the through hole h can be further reduced in weight.

(8) In this embodiment, the rear surface 4b of the floor tunnel 4 and the front surface 7b of the first cross member 7 form a groove-shaped recess 12 extending in the vehicle width direction between them. A wire harness H is arranged. That is, according to the present embodiment, the wire harness H can be routed so as to cross the vicinity of the rear end portion 41 of the floor tunnel 4 in the vehicle width direction, so that the wire harness H can be routed freely inside the vehicle body. degree will improve.

(9) In this embodiment, the first cross member 7 is joined to the upper surface of the floor panel 1, and the wire harness H is fixed to the first cross member 7. According to this configuration, the wire harness H is supported by the floor panel 1 via the first cross member 7, which is necessary when the wire harness H is directly fixed to the floor panel 1 as shown in FIG. Therefore, the structure for preventing the wire harness H fixing device from being exposed to water can be omitted. Specifically, the bracket B (see FIG. 6) for attaching the clamp 14 to the floor panel 1 can be omitted without forming a through hole in the floor panel 1.

The embodiments described above are merely illustrative, provided to facilitate understanding of the invention. The technical scope of the invention is not limited to the specific technical matters disclosed in the above embodiments, but also includes various modifications, changes, alternative techniques, etc. that can be easily derived therefrom.

Although the above embodiment has been described using an electric vehicle (EV) as an example, it goes without saying that the present invention can also be applied to a hybrid vehicle (HV), a fuel cell vehicle (FCV), and the like.

2 Battery 4 Floor tunnel 4b Rear surface T Wire penetration part 7 First cross member (cross member)
7b Front side 12 Recess W Electric wire W ₁ First electric wire (electric wire)
W ₂ 2nd electric wire (electric wire)
H Wire harness

Claims (4)

The battery is located at the rear of the vehicle body than the floor tunnel,
An electric wire connected to the battery passes through an electric wire penetration part provided on the rear wall of the floor tunnel,
A vehicle body floor structure, wherein a cross member disposed near the electric wire penetration portion extends continuously in the vehicle width direction from one side to the other side in the vehicle width direction. The vehicle body floor structure according to claim 1, wherein the battery is fixed to the cross member. The rear surface of the floor tunnel and the front surface of the cross member form a groove-shaped recess extending in the vehicle width direction therebetween;
The vehicle body floor structure according to claim 1 or 2 , wherein a wire harness is routed within the recess. The cross member is joined to the upper surface of the floor panel,
The vehicle body floor structure according to claim 3 , wherein the wire harness is fixed to the cross member.

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