Vehicle undercarriage

Abstract

This facilitates the routing of large-diameter cable members inside the floor tunnel where the tunnel brace is installed. [Solution] The vehicle understructure 10 includes a first tunnel brace 36 that extends in the vehicle width direction inside the floor tunnel 18 and divides the space inside the floor tunnel 18 vertically, and a plurality of routing members (fuel pipes 42, 44, brake pipes 46, 48, air conditioning pipes 50, 52, 54, 56, high-voltage wire harnesses 58, 60 and cooling pipes 62, 64) routed inside the floor tunnel 18 through the upper and lower spaces US1, LS1 of the first tunnel brace 36. The upper and lower surfaces of the first tunnel brace 36 are provided with recesses 36A and 36B that reduce the width of the first tunnel brace 36 in the vehicle vertical direction, and a portion of the routing members is arranged in the recesses 36A and 36B.

Description

Technical Field

[0001] The present invention relates to a vehicle underbody structure.

Background Art

[0002] The vehicle underbody structure disclosed in Patent Document 1 below includes a tunnel brace that extends in the vehicle width direction inside the floor tunnel. The space inside the floor tunnel is partitioned vertically by the tunnel brace, and a plurality of wirings and pipes are routed inside the floor tunnel through the upper and lower spaces of the tunnel brace.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above prior art, for example, when the diameter of a wiring member such as a wiring or a pipe increases, there is a risk that it cannot be fully routed (stored) inside the floor tunnel.

[0005] In consideration of the above facts, an object of the present invention is to obtain a vehicle underbody structure that facilitates routing a large-diameter wiring member inside a floor tunnel provided with a tunnel brace.

Means for Solving the Problems

[0006] The vehicle understructure of the first embodiment comprises a floor tunnel extending in the longitudinal direction of the vehicle at the center of the vehicle width direction of the vehicle floor and opening downward in the vertical direction of the vehicle; a tunnel brace connecting the inside of the floor tunnel in the vehicle width direction and dividing the space inside the floor tunnel vertically; and a plurality of routing members routed inside the floor tunnel through at least one of the upper and lower spaces of the tunnel brace, wherein at least one of the upper and lower surfaces of the tunnel brace is provided with a recess that reduces the width of the tunnel brace in the vertical direction of the vehicle, and a part of the routing members is arranged in the recess.

[0007] In the first embodiment, the floor tunnel extends in the longitudinal direction of the vehicle at the center of the vehicle width direction at the bottom of the vehicle and opens downward in the vertical direction of the vehicle. The interior of this floor tunnel is connected in the vehicle width direction by a tunnel brace, and the space inside the floor tunnel is divided vertically by the tunnel brace. Multiple cable members are routed inside the floor tunnel through at least one of the vertical spaces of the tunnel brace. At least one of the upper and lower surfaces of the tunnel brace is provided with a recess that reduces the width of the tunnel brace in the vertical direction of the vehicle, and a part of the cable members is arranged in this recess. This makes it easier to route large-diameter cable members inside the floor tunnel which is divided vertically by the tunnel brace.

[0008] In the second embodiment of the vehicle understructure, the ceiling portion of the floor tunnel has a section parallel to the vehicle width direction when viewed in the vehicle's longitudinal direction, and the recess of the tunnel brace is arranged to overlap with the section when viewed in the vehicle's vertical direction.

[0009] In the second embodiment, a recess provided on at least one of the upper and lower surfaces of the tunnel brace is positioned so as to overlap, in the vertical direction of the vehicle, with a section provided in the ceiling of the floor tunnel that is parallel to the vehicle width direction in the vehicle longitudinal direction view. As a result, the recess is provided in a section in the space above the tunnel brace that substantially widens the cable routing space, making it easier to secure space for routing large diameter cable members.

[0010] In the third embodiment of the vehicle understructure, the recess of the tunnel brace is inclined or curved so as to be most recessed in the center of the tunnel brace in the vehicle width direction, as in the first or second embodiment.

[0011] In the third embodiment, the recess provided on at least one of the upper and lower surfaces of the tunnel brace is inclined or curved so as to be most recessed in the center of the tunnel brace in the vehicle width direction. As a result, the width of the tunnel brace in the vehicle vertical direction is narrowest in the center of the tunnel brace in the vehicle width direction, making it easier to secure space for routing large diameter routing members while ensuring the strength of the tunnel brace.

[0012] The vehicle understructure of the fourth embodiment includes a reinforcing member attached along the inner surface of the floor tunnel in any one of the first to third embodiments, wherein the tunnel brace is attached to the floor tunnel via the reinforcing member.

[0013] In the fourth embodiment, the tunnel brace is attached to the floor tunnel via reinforcing members installed along the inner surface of the floor tunnel. This makes it possible to make effective use of the limited space within the floor tunnel.

[0014] The vehicle understructure of the fifth embodiment has a bracket attached to the reinforcing member, the bracket has a plurality of insertion parts through which a plurality of the cable routing members are inserted, and the plurality of insertion parts are arranged alternately in the vehicle width direction in the vehicle vertical direction.

[0015] In the fifth aspect, brackets are attached to a reinforcing member attached along the inner surface of the floor tunnel. The bracket has a plurality of insertion portions through which a plurality of cable members are inserted. The plurality of insertion portions are arranged alternately in the vehicle up-and-down direction and side by side in the vehicle width direction. Thereby, the plurality of cable members can be efficiently routed in a narrow space, and variations in the routing paths of the plurality of cable members can be suppressed.

Advantages of the Invention

[0016] As described above, according to the vehicle underbody structure according to the present invention, it becomes easier to route a large-diameter cable member inside the floor tunnel provided with the tunnel brace.

Brief Description of the Drawings

[0017] [Figure 1] It is a rear view showing the configuration around the first tunnel brace in the vehicle underbody structure according to the embodiment. [Figure 2] It is a bottom view showing the vehicle underbody structure according to the embodiment. [Figure 3] It is a first perspective view showing a part of the vehicle underbody structure according to the embodiment. [Figure 4] It is a second perspective view showing a part of the vehicle underbody structure according to the embodiment. [[ID=I27]] [[ID=I28]] [Figure 5] [[ID=I29]]It is a bottom view showing a part of the vehicle body of a vehicle to which the vehicle underbody structure according to the embodiment is applied. [Figure 6] It is a bottom view showing an enlarged part of FIG. 5. [Figure 7] It is a first perspective view showing a part of the same vehicle body. [Figure 8] It is a second perspective view showing a part of the same vehicle body. [Figure 9] It is a rear view showing the configuration around the first tunnel brace in the vehicle underbody structure according to the embodiment and is a view showing the configuration around the bracket. [Figure 10] It is a rear view showing the configuration around the first tunnel brace in the vehicle underbody structure according to the embodiment. [Figure 11] It is a rear view showing the configuration around the second tunnel brace in the vehicle lower structure according to the embodiment. [Figure 12] It is a rear view showing the configuration around the first tunnel brace in the vehicle lower structure according to the first modification of the embodiment. [Figure 13] It is a rear view showing the configuration around the second tunnel brace in the vehicle lower structure according to the first modification of the embodiment. [Figure 14] It is a rear view showing the configuration around the first tunnel brace in the vehicle lower structure according to the second modification of the embodiment. [Figure 15] It is a rear view showing the configuration around the second tunnel brace in the vehicle lower structure according to the second modification of the embodiment.

Mode for Carrying Out the Invention

[0018] Hereinafter, the vehicle lower structure 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 12. In each figure, some reference numerals may be omitted for ease of viewing the drawing. Also, the arrows FR, UP, and RH appropriately marked in each figure indicate the front direction (travel direction), upward direction, and right direction of the vehicle, respectively. Hereinafter, when simply explaining using the front-back, left-right, up-down directions, it shall indicate the direction with respect to the vehicle unless otherwise specified.

[0019] (Configuration) As shown in Figures 1 to 4, the vehicle understructure 10 according to this embodiment includes a floor tunnel 18 extending in the longitudinal direction in the center of the vehicle width direction (center in the left-right direction) of the vehicle floor, a first tunnel brace 36 and a second tunnel brace 38 extending in the vehicle width direction inside the floor tunnel, and fuel pipes 42, 44, brake pipes 46, 48, air conditioning pipes (refrigerant pipes) 50, 52, 54, 56, high-pressure wire harnesses 58, 60, and cooling pipes 62, 64 routed within the floor tunnel 18. The first tunnel brace 36 and the second tunnel brace 38 correspond to the "tunnel brace" in this invention, and the fuel pipes 42, 44, brake pipes 46, 48, air conditioning pipes 50, 52, 54, 56, high-pressure wire harnesses 58, 60, and cooling pipes 62, 64 correspond to the "routing members" in this invention.

[0020] As shown in Figures 5 to 8, the vehicle body 11 to which the vehicle understructure 10 according to this embodiment is applied comprises the floor tunnel 18, left and right rockers 12 extending in the longitudinal direction on both sides (both sides in the left-right direction) of the floor, left and right floor panels 20 positioned between the left and right rockers 12 and the floor tunnel 18, left and right first cross members 24 positioned on the upper side of the left and right floor panels 20 and connecting the left and right rockers 12 and the floor tunnel 18, and left and right second cross members 26 positioned on the upper surface of the left and right floor panels 20 rearward from the left and right first cross members 24 and connecting the left and right rockers 12 and the floor tunnel 18.

[0021] The first tunnel brace 36 and the second tunnel brace 38 each connect the interior of the floor tunnel 18 in the vehicle width direction. Specifically, the first tunnel brace 36 connects the left and right side walls 18S of the floor tunnel 18 in the vehicle width direction via the first floor tunnel reinforcement 30. The second tunnel brace 38 connects the left and right side walls 18S of the floor tunnel 18 in the vehicle width direction via the second floor tunnel reinforcement 32. The first floor tunnel reinforcement 30 and the second floor tunnel reinforcement 32 correspond to the "reinforcement members" in this invention. A battery (not shown) is located below the floor tunnel 18 and the left and right floor panels 20.

[0022] Each left and right rocker 12 is composed of a rocker outer panel 14 positioned on the outside in the vehicle width direction and a rocker inner panel 16 positioned on the inside in the vehicle width direction. The rocker outer panel 14 and the rocker inner panel 16 are made of, for example, press-formed steel plate and have a roughly hat-shaped cross-section with the sides facing each other in a front-to-rear view being open. By joining these rocker outer panels 14 and rocker inner panels 16, each rocker 12 is formed with a hollow, closed cross-section in a front-to-rear view.

[0023] The floor tunnel 18 is made of, for example, a press-formed steel plate and has a hat-shaped cross-section that is convex upward when viewed in the front-rear direction. The floor tunnel 18 has left and right side wall portions 18S that are opposite to each other in the left-right direction, a ceiling portion 18U that connects the upper ends of the left and right side wall portions 18S in the left-right direction, and left and right flange portions 18F (see Figure 5; reference numerals are omitted in Figures 1 and 7) that extend outward in the vehicle width direction from the lower ends of the left and right side wall portions 18S, and opens downward in the vertical direction.

[0024] Between the floor tunnel 18 and the left and right rockers 12, the left and right floor panels 20 are positioned. The left and right floor panels 20 are made of, for example, press-formed steel plates and are plate-shaped with the vertical direction as the thickness direction. The left and right floor panels 20 have their outer ends in the vehicle width direction joined to the left and right rockers 12, and their ends on the center side in the vehicle width direction are joined to the left and right flange portions 18F of the floor tunnel 18.

[0025] The first cross member 24 and the second cross member 26 are made of, for example, press-formed steel plate and have a hat-shaped cross section that is convex upward when viewed from the left to right. These first cross member 24 and the second cross member 26 are seat cross members to which a front seat (not shown) is attached, and are joined to the upper surface of each floor panel 20. Together with each floor panel 20, the first cross member 24 and the second cross member 26 form a closed cross section.

[0026] The left-side first cross member 24 and second cross member 26 are joined at their outer ends in the vehicle width direction to the rocker inner panel 16 of the left-side rocker 12, and at their central ends in the vehicle width direction to the left-side wall portion 18S of the floor tunnel 18. The right-side first cross member 24 and second cross member 26 are joined at their outer ends in the vehicle width direction to the rocker inner panel 16 of the right-side rocker 12, and at their central ends in the vehicle width direction to the right-side wall portion 18S of the floor tunnel 18.

[0027] The first floor tunnel reinforcement 30 and the second floor tunnel reinforcement 32 are located inside the floor tunnel 18. The first tunnel brace 36 is attached to the floor tunnel 18 via the first floor tunnel reinforcement 30, and the second tunnel brace 38 is attached to the floor tunnel 18 via the second floor tunnel reinforcement 32.

[0028] The first floor tunnel reinforcement 30 and the second floor tunnel reinforcement 32 are made of, for example, press-formed steel plates and are attached along the inner surface of the floor tunnel 18, forming a roughly hat shape when viewed in the front-rear direction. The first floor tunnel reinforcement 30 and the second floor tunnel reinforcement 32 are joined to the left and right side walls 18S, the ceiling 18U, and the left and right flanges 18F of the floor tunnel 18.

[0029] The first floor tunnel reinforcement 30 and the left and right first cross members 24 are positioned aligned in the front-to-back direction, and the second floor tunnel reinforcement 32 and the left and right second cross members 26 are positioned aligned in the front-to-back direction. The front-to-back width dimension of the first floor tunnel reinforcement 30 is set to be the same as the front-to-back width dimension of the left and right first cross members 24, and the front-to-back width dimension of the second floor tunnel reinforcement 32 is set to be the same as the front-to-back width dimension of the left and right second cross members 26.

[0030] The first tunnel brace 36 is constructed by joining two members 36A and 36B (see Figures 7 and 8), which are made of press-formed steel plates, and has an elongated shape with its longitudinal side in the vehicle width direction (left-right direction). The two members 36A and 36B have an open cross-sectional shape that extends in the vehicle width direction, while the first tunnel brace 36 has a closed cross-sectional shape that extends in the vehicle width direction. Similarly, the second tunnel brace 38 is constructed by joining two members 38A and 38B (see Figures 7 and 8), which are made of press-formed steel plates, and has an elongated shape with its longitudinal side in the vehicle width direction (left-right direction). The two members 38A and 38B have an open cross-sectional shape that extends in the vehicle width direction, while the second tunnel brace 38 has a closed cross-sectional shape that extends in the vehicle width direction.

[0031] The first tunnel brace 36 has a thickness in the longitudinal direction that is thinner than the width of the first cross member 24 in the longitudinal direction, and the second tunnel brace 38 has a thickness in the longitudinal direction that is thinner than the width of the second cross member 26 in the longitudinal direction. The first tunnel brace 36 and the second tunnel brace 38 are formed so that their vertical width decreases as they move towards the longitudinal center.

[0032] The ends of the first tunnel brace 36 in the vehicle width direction (both ends in the longitudinal direction) are superimposed on the first floor tunnel reinforcement 30 from the rear. The ends of the first tunnel brace 36 in the vehicle width direction are fastened and fixed to the first floor tunnel reinforcement 30 using two upper and lower bolts 40 and two upper and lower nuts (not shown). The bolts 40 and nuts are arranged with the front-rear direction as the axial direction. Through this fastening and fixing, the left and right side walls 18S of the floor tunnel 18 are connected in the vehicle width direction via the first floor tunnel reinforcement 30 and the first tunnel brace 36. As shown in Figures 1 and 10, the first tunnel brace 36 divides the internal space of the floor tunnel 18 into an upper space US1 and a lower space LS1.

[0033] The vehicle width direction ends (longitudinal direction ends) of the second tunnel brace 38 are overlapped with the second floor tunnel reinforcement 32 from the front. The vehicle width direction ends of the second tunnel brace 38 are fastened and fixed to the second floor tunnel reinforcement 32 using two upper and lower bolts 40 and two upper and lower nuts (not shown). The bolts 40 and nuts are arranged with the front-rear direction as the axial direction. Through this fastening and fixing, the left and right side walls 18S of the floor tunnel 18 are connected in the vehicle width direction via the second floor tunnel reinforcement 32 and the second tunnel brace 38. As shown in Figure 11, the second tunnel brace 38 divides the internal space of the floor tunnel 18 into an upper space US2 and a lower space LS2.

[0034] In Figures 10 and 11, P is a plate for holding the cable members routed in the spaces LS1 and LS2 below the first tunnel brace 36 and the second tunnel brace 38. This plate P (not shown in Figure 1) is located at the bottom of the floor tunnel 18 and is provided to form a closed cross section together with the floor tunnel 18. This plate P ensures that the cable members are securely held, separated from a battery (not shown). This plate P can also function as a load transmission path during a side collision of the vehicle.

[0035] As shown in Figures 1-4, 10, and 11, fuel lines 42 and 44, brake lines 46 and 48, and air conditioning lines 50, 52, 54, and 56 are routed within the floor tunnel 18 through the upper space US1 of the first tunnel brace 36 and the upper space US2 of the second tunnel brace 38. High-voltage wire harnesses 58 and 60 and cooling lines 62 and 64 are routed within the floor tunnel 18 through the lower space LS1 of the first tunnel brace 36 and the lower space LS2 of the second tunnel brace 38. Figures 10 and 11 schematically illustrate fuel lines 42 and 44, brake lines 46 and 48, air conditioning lines 50, 52, 54, and 56, high-voltage wire harnesses 58 and 60, and cooling lines 62 and 64.

[0036] Recesses 36A and 36B are formed on the upper and lower surfaces of the first tunnel brace 36, respectively, which reduce the vertical width of the first tunnel brace 36. Recess 36A is curved in an arc shape, convex downwards when viewed in the front-rear direction, and recess 36B is curved in an arc shape, convex upwards when viewed in the front-rear direction. Recess 36A is curved to be most recessed downwards at the left-right center of the first tunnel brace 36 (center in the vehicle width direction), and recess 36B is curved to be most recessed upwards at the left-right center of the first tunnel brace 36 (center in the vehicle width direction). As a result, the first tunnel brace 36 is formed so that its vertical width is narrowest at the center in the vehicle width direction.

[0037] Similarly, recesses 38A and 38B are formed on the upper and lower surfaces of the second tunnel brace 38, respectively, which reduce the vertical width of the second tunnel brace 38. Recess 38A is curved in an arc shape, convex downwards when viewed in the front-rear direction, and recess 38B is curved in an arc shape, convex upwards when viewed in the front-rear direction. Recess 38A is curved to be most recessed downwards at the left-right center of the second tunnel brace 38 (center in the vehicle width direction), and recess 38B is curved to be most recessed upwards at the left-right center of the second tunnel brace 38 (center in the vehicle width direction). As a result, the second tunnel brace 38 is formed so that its vertical width is narrowest at the center in the vehicle width direction.

[0038] The curvature of the recesses 36A, 36B, 38A, and 38B described above is set to be large enough so that bending cracks do not occur in the first tunnel brace 36 and the second tunnel brace 38, which are structural members. This maximizes the aforementioned spaces US1, LS1, US2, and LS2, making it easier to route large-diameter cable members in these spaces. In this embodiment, the upper and lower surfaces of the first tunnel brace 36 and the upper and lower surfaces of the second tunnel brace 38 are curved surfaces, but the embodiment is not limited to this, and they may be configured as inclined surfaces.

[0039] The ceiling portion 18U of the floor tunnel 18 has a section 18U1 that is parallel to the left-right direction (vehicle width direction) when viewed in the front-rear direction, and the recesses 36A and 36B of the first tunnel brace 36 and the recesses 38A and 38B of the second tunnel brace 38 are arranged to overlap with the above section 18U1 when viewed in the vertical direction. The respective placement heights of the first tunnel brace 36 and the second tunnel brace 38 are set to be in the vertical middle part of the floor tunnel 18. These placement heights are set considering the efficient transmission of the load of a side collision of the vehicle from the first cross member 24 and the second cross member 26 on the collision side to the first cross member 24 and the second cross member 26 on the non-collision side via the first tunnel brace 36 and the second tunnel brace 38.

[0040] Furthermore, the rear of a vehicle to which the vehicle understructure 10 according to this embodiment is applied is equipped with a drive unit for an electric vehicle (so-called e-Axle) and an air conditioning unit for a rear air conditioner (not shown), and fuel lines 42 and 44, brake lines 46 and 48, air conditioning lines 50, 52, 54 and 56, high-voltage wire harnesses 58 and 60, and cooling lines 62 and 64 are routed within the floor tunnel 18. The routing paths of these routing members must be established while passing through the centroids of the first tunnel brace 36 and the second tunnel brace 38.

[0041] For this reason, in this vehicle, as an example, fuel lines 42 and 44 and brake lines 46 and 48 are inserted on the left side of the upper spaces US1 and US2 of the first tunnel brace 36 and the second tunnel brace 38, and air conditioning lines 50, 52, 54 and 56 are inserted on the right side of the upper spaces US1 and US2. In addition, high-voltage wire harnesses 58 and 60 are inserted on the left side and in the center in the left-right direction of the lower spaces LS1 and LS2 of the first tunnel brace 36 and the second tunnel brace 38, and cooling lines 62 and 64 are inserted on the right side of the lower spaces LS1 and LS2. As shown in Figure 11, a high-voltage wire harness 61, which integrates the high-voltage wire harnesses 58 and 60, is inserted in the lower space LS2 of the second tunnel brace 38.

[0042] In other words, in this embodiment, in order to route multiple routing members within the floor tunnel 18 while passing through the centroids of the first tunnel brace 36 and the second tunnel brace 38, the multiple routing members are distributed into the upper spaces US1 and US2 and the lower spaces LS1 and LS2 of the first tunnel brace 36 and the second tunnel brace 38. Furthermore, by configuring the first tunnel brace 36 and the second tunnel brace 38 to be narrowest in the center in the vehicle width direction, the strength of the first tunnel brace 36 and the second tunnel brace 38 is ensured while the above spaces US1, US2, LS1, and LS2 are enlarged, making it easier to route large-diameter routing members.

[0043] Furthermore, in this embodiment, the high-voltage wire harnesses 58 and 60, which have a larger diameter, and the air conditioning pipes 50, 52, 54, and 56 are routed separately above and below the first tunnel brace 36 and the second tunnel brace 38 so that they are not aligned horizontally in the vehicle width direction. In addition, the vehicle width direction of the high-voltage wire harnesses 60 is aligned with the vehicle width direction of the center of the first tunnel brace 36 and the second tunnel brace 38, which have the narrowest vertical width, thereby securing space for routing the high-voltage wire harnesses 60. Moreover, the high-voltage wire harnesses 58 and 60 are routed so that their position in the vehicle width direction is aligned between adjacent weld beads B (see Figure 10) provided on the first tunnel brace 36.

[0044] Furthermore, in this embodiment, brackets 66 and 68 (see Figures 1 and 9) shown in Figures 1 and 9 are used to effectively utilize the upper spaces US1 and US2 of the first tunnel brace 36 and the second tunnel brace 38, and to suppress variations in the routing paths of the narrow-diameter fuel pipes 42 and 44 and brake pipes 46 and 48. These brackets 66 and 68 are manufactured, for example, by resin injection molding and are fixed to the first floor tunnel reinforcement 30 and the second floor tunnel reinforcement 32.

[0045] These brackets 66 and 68 have multiple notched insertion sections 70 (see Figure 9; no reference numerals in Figure 1) through which fuel pipes 42 and 44 and brake pipes 46 and 48 are inserted, and claws 72 (see Figure 9; no reference numerals in Figure 1) for preventing the fuel pipes 42 and 44 and brake pipes 46 and 48 from coming out of the insertion sections 70. The multiple insertion sections 70 are arranged alternately (staggered) in the vertical direction and in the horizontal direction (vehicle width direction). These brackets 66 and 68 regulate the relative positions of the fuel pipes 42 and 44 and brake pipes 46 and 48, while the alternate configuration makes effective use of the space in the vertical, horizontal, and vertical directions.

[0046] Vehicles to which the vehicle understructure 10 according to this embodiment is applied share a platform with vehicles of other types. In vehicles of other types, the wiring members are routed as shown in the modified examples in Figures 12 to 15. In the first modified example shown in Figures 12 and 13, fuel pipes 42 and 44, brake pipes 46 and 48, and a high-voltage wire harness 74 are routed in the upper spaces US1 and US2 of the first tunnel brace 36 and the second tunnel brace 38. No wiring members are routed in the lower spaces LS1 and LS2 of the first tunnel brace 36 and the second tunnel brace 38.

[0047] In the second modified example shown in Figures 14 and 15, brake lines 46, 48 and air conditioning lines 50, 52, 54, 56 are routed in the upper spaces US1, US2 of the first tunnel brace 36 and the second tunnel brace 38. High-voltage wire harnesses 76, 78 and cooling lines 80, 82 are routed in the lower spaces LS1, LS2 of the first tunnel brace 36 and the second tunnel brace 38. In this embodiment, the platform can be shared by multiple vehicles with different routing members routed within the floor tunnel 18.

[0048] (Mechanism of Action and Effects) Next, the operation and effects of this embodiment will be described.

[0049] In the vehicle understructure 10 with the above configuration, the left and right rockers 12 and the floor tunnel 18 are connected by the left and right first cross members 24 and second cross members 26. The first tunnel brace 36 and second tunnel brace 38, which divide the space inside the floor tunnel 18 vertically, connect the inside of the floor tunnel 18 in the vehicle width direction. The left and right first cross members 24 and the first tunnel brace 36 are positioned with the same height in the vertical direction, and the second cross member 26 and the second tunnel brace 38 are also positioned with the same height in the vertical direction. With this configuration, the load of a side collision of the vehicle can be efficiently transmitted from the first cross member 24 and second cross member 26 on the collision side to the first cross member 24 and second cross member 26 on the non-collision side via the first tunnel brace 36 and second tunnel brace 38. As a result, deformation of the floor tunnel 18 can be suppressed, and a high load buildup during collision can be achieved.

[0050] Furthermore, in this embodiment, the interior of the floor tunnel 18 is divided vertically by the first tunnel brace 36 and the second tunnel brace 38. Multiple wiring members (fuel pipes 42, 44, brake pipes 46, 48, air conditioning pipes 50, 52, 54, 56, high-voltage wire harnesses 58, 60, and cooling pipes 62, 64) are distributed and routed in the upper spaces US1, US2 and lower spaces LS1, LS2 of the first tunnel brace 36 and the second tunnel brace 38. Moreover, recesses 36A, 36B, 38A, and 38B are provided on the upper and lower surfaces of the first tunnel brace 36 and the second tunnel brace 38, respectively, reducing their vertical width, and some of the wiring members are routed within these recesses 36A, 36B, 38A, and 38B. This makes it easier to route large-diameter cable members inside the floor tunnel 18, which is divided vertically by the first tunnel brace 36 and the second tunnel brace 38.

[0051] Furthermore, in this embodiment, the recesses 36A, 36B, 38A, and 38B of the first tunnel brace 36 and the second tunnel brace 38 are arranged to overlap, in a vertical view, with a section 18U1 provided in the ceiling portion 18U of the floor tunnel 18, which is parallel to the vehicle width direction in a longitudinal view. As a result, in the spaces US1 and US2 above the first tunnel brace 36 and the second tunnel brace 38, the recesses US1 and US2 are provided in sections S (see Figure 1) that substantially widen the cable routing space, making it easier to secure cable routing space for large diameter cable members.

[0052] Furthermore, in this embodiment, the recesses 36A, 36B, 38A, and 38B of the first tunnel brace 36 and the second tunnel brace 38 are curved so that they are most recessed in the center of the first tunnel brace 36 and the second tunnel brace 38 in the vehicle width direction. As a result, the vertical width of the first tunnel brace 36 and the second tunnel brace 38 is narrowest in the center of the first tunnel brace 36 and the second tunnel brace 38 in the vehicle width direction, which makes it easier to route large-diameter cable members in the vertical space in the central part of the first tunnel brace 36 and the second tunnel brace 38 in the vehicle width direction while ensuring the strength of the first tunnel brace 36 and the second tunnel brace 38.

[0053] Furthermore, in this embodiment, a first floor tunnel reinforcement 30 and a second floor tunnel reinforcement 32 are provided, which are attached along the inner surface of the floor tunnel 18. The first tunnel brace 36 and the second tunnel brace 38 are attached to the floor tunnel 18 via the first floor tunnel reinforcement 30 and the second floor tunnel reinforcement 32. This effectively suppresses deformation of the floor tunnel 18 due to the load of a side collision of a vehicle, and makes effective use of the limited space within the floor tunnel 18.

[0054] Furthermore, this embodiment includes resin brackets 66 and 68 attached to the first floor tunnel reinforcement 30 and the second floor tunnel reinforcement 32. These brackets 66 and 68 have a plurality of insertion parts 70 through which fuel pipes 42 and 44 and brake pipes 46 and 48 are inserted. These plurality of insertion parts 70 are arranged alternately in the vertical direction and aligned in the vehicle width direction. This allows the fuel pipes 42 and 44 and brake pipes 46 and 48 to be efficiently routed in a narrow space, and reduces variations in the routing paths of the multiple routing members.

[0055] In the above embodiment, the recesses 36A, 36B, 38A, and 38B of the first tunnel brace 36 and the second tunnel brace 38 are curved in an arc shape when viewed in the front-rear direction, but the shape of the recesses can be changed as appropriate. For example, the shape of the recesses may be rectangular or triangular when viewed in the front-rear direction. Alternatively, a configuration may be provided in which a plurality of recesses are formed in the vehicle width direction on at least one of the upper and lower surfaces of each tunnel brace 36, 38.

[0056] Furthermore, in the above embodiment, the first tunnel brace 36 and the second tunnel brace 38 are attached to the floor tunnel 18 via the first floor tunnel reinforcement 30 and the second floor tunnel reinforcement 32, but the embodiment is not limited to this. The first tunnel brace 36 and the second tunnel brace 38 may be directly attached to the floor tunnel 18.

[0057] Although the present invention has been described above with reference to embodiments, the present invention can be implemented with various modifications without departing from its spirit. Furthermore, it goes without saying that the scope of the present invention is not limited to the above embodiments. [Explanation of Symbols]

[0058] 10. Vehicle understructure 12 Rocka 18 Floor Tunnel 18U Ceiling Section 18U1 30. First floor tunnel reinforcement (reinforcement member) 32. Second floor tunnel reinforcement (reinforcement member) 36 First Tunnel Brace 36A Recess 36B Recess 38 Second Tunnel Brace 38A Recess 38B Recess 42, 44 Fuel piping 46, 48 Brake lines 50, 52, 54, 56 Air conditioner piping 58, 60 High-voltage wire harness 62, 64 Cooling pipes 66, 68 brackets 70 Insertion part US1, LS1, US2, LS2 space

Claims

1. A floor tunnel extends in the longitudinal direction of the vehicle at the center of the vehicle width direction of the vehicle floor and opens downward in the vertical direction of the vehicle, A tunnel brace connects the interior of the floor tunnel in the vehicle width direction and divides the space inside the floor tunnel vertically, A plurality of routing members are routed inside the floor tunnel through at least one of the upper and lower spaces of the tunnel brace, Equipped with, A vehicle understructure in which at least one of the upper and lower surfaces of the tunnel brace is provided with a recess that reduces the width of the tunnel brace in the vehicle's vertical direction, and a portion of the cable routing member is arranged within the recess.

2. The ceiling of the aforementioned floor tunnel has a section parallel to the vehicle width direction when viewed in the front-rear direction of the vehicle. The vehicle understructure according to claim 1, wherein the recess of the tunnel brace is arranged to overlap with the compartment when viewed in the vertical direction of the vehicle.

3. The vehicle understructure according to claim 1 or claim 2, wherein the recess of the tunnel brace is inclined or curved so as to be most recessed in the center of the tunnel brace in the vehicle width direction.

4. The floor tunnel is equipped with a reinforcing member attached along its inner surface, The vehicle understructure according to claim 1 or claim 2, wherein the tunnel brace is attached to the floor tunnel via the reinforcing member.

5. Having a bracket attached to the reinforcing member, The bracket has multiple insertion portions through which multiple routing members are inserted, The vehicle understructure according to claim 4, wherein the plurality of insertion portions are arranged alternately in the vehicle width direction in the vehicle vertical direction.

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