Vehicle lower structure

Abstract

To provide a vehicle lower structure capable of reducing the number of components.SOLUTION: The vehicle lower structure comprises a resin rear floor section 22, which is provided at a rear portion of the vehicle and includes a floor pan component 27, and a resin under cover section 29, which forms a lower surface of the rear portion of the vehicle and is integrally molded with a lower end portion of the rear floor section.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle undercarriage. [Background technology]

[0002] Patent Document 1 listed below discloses a vehicle lower structure intended to improve aerodynamic characteristics by using an undercover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-122774 Summary of the Invention [Problem to be solved by the invention]

[0004] Until now, the rear floor at the rear of a vehicle has been manufactured as an iron part, while the undercover that forms the underside of the rear of the vehicle has been a plastic product. In other words, the rear floor and undercover have been manufactured as separate parts. Therefore, there is room for improvement in the conventional vehicle undercarriage in terms of reducing the number of parts.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a vehicle underbody structure that can reduce the number of parts. [Means for solving the problem]

[0006] The vehicle undercarriage structure of the first embodiment comprises a rear floor portion made of resin that is provided at the rear of the vehicle and has a floor pan component, and an undercover portion made of resin that forms the underside of the rear portion and is integrally molded with the rear floor portion.

[0007] The vehicle undercarriage structure of the first aspect includes a resin rear floor section provided at the rear of the vehicle and having a floor pan component, and a resin undercover section that forms the underside of the rear of the vehicle and is integrally molded with the rear floor section. Therefore, the vehicle undercarriage structure of the first aspect can reduce the number of parts compared to when the components corresponding to the rear floor section and the undercover section are configured as separate components. Furthermore, the resin rear floor section has a high degree of freedom in design and manufacturing, making it easy to form the floor pan component into a shape that connects to the undercover section.

[0008] The vehicle underbody structure of a second aspect is the first aspect, wherein the floor pan constituent portion includes a vertical wall portion that extends downward and has a lower end portion connected to the undercover portion.

[0009] The floor pan component of the vehicle undercarriage structure of the second aspect includes a vertical wall portion that extends downward and has a lower end connected to the undercover portion, so that the floor pan component can be formed into a deeply carved shape so as to be connected to the undercover portion.

[0010] The vehicle undercarriage structure of the third aspect is the same as that of the first or second aspect, and includes a bumper cover provided at the rear and having a lower end connected to the rear end of the undercover portion, and the lower surface of the rear end of the undercover portion and the lower surface of the lower end of the bumper cover are flush with each other.

[0011] In the vehicle underbody structure of the third aspect, the undersurface of the rear end of the undercover portion and the undersurface of the front end of the bumper cover are flush with each other, allowing the undercover portion and the bumper cover to exhibit good aerodynamic characteristics. [Effects of the Invention]

[0012] As described above, the vehicle underbody structure according to the present invention has the excellent effect of being able to reduce the number of parts. [Brief explanation of the drawings]

[0013] [Figure 1]FIG. 2 is a schematic perspective view of a resin unit, a cross member, and a rear side member of the vehicle underbody structure according to the embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along the arrow line 2-2 in FIG. [Figure 3] FIG. 3 is a cross-sectional view similar to FIG. 2 of a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a vehicle undercarriage structure according to an embodiment will be described with reference to the accompanying drawings. Note that the arrows UP, FR, and LH shown in each drawing indicate the upper side in the vertical direction of the vehicle, the front side in the longitudinal direction of the vehicle, and the left side in the lateral direction of the vehicle, respectively.

[0015] 1 and 2 show the rear of a vehicle 10 to which the vehicle undercarriage structure of this embodiment is applied. A cross member 14, which is a body frame member and extends in the vehicle width direction (left-right direction), and a pair of left and right rear side members 16, which are also body frame members and extend in the front-rear direction, are provided at the rear of a body 12 of the vehicle 10. Both left and right ends of the cross member 14 are connected to the left and right rear side members 16, respectively.

[0016] A resin unit 20, which is an integrally molded resin product, is provided in the space between the cross member 14 and the left and right rear side members 16. The resin unit 20 includes a rear floor portion 22 and an undercover portion 29. The rear floor portion 22 includes a floor component 23 that is flat and has a generally U-shaped planar shape, and a floor pan component 27 that extends downward from the inner peripheral edge of the floor component 23. The cross section of the floor pan component 27 when cut along a horizontal plane is generally U-shaped. A front wall portion (vertical wall portion) 27A of the floor pan component 27 is a plate-like portion that extends generally vertically downward from the floor component 23. Furthermore, the outer peripheral portion of a flat undercover portion 29 that has a generally rectangular planar shape is connected to the peripheral edge of the lower end of the floor pan component 27. As shown in FIG. 2 , in a side view, the lower surface of the undercover portion 29 is inclined at an angle α° with respect to the horizontal plane HS. For example, α=8°. As shown in FIG. 2, the undercover portion 29 forms the lower surface of the rear portion of the vehicle body 12.

[0017] Left and right side portions 24 of the floor constituent portion 23 are placed on the upper surfaces of the left and right rear side members 16 and are fixed to each rear side member 16. Furthermore, a front portion 25 of the floor constituent portion 23 is placed on the upper surfaces of the cross members 14 and is fixed to each cross member 14.

[0018] As shown in FIG. 2, a rear bag 30 is fixed to the rear end of the floor pan component 27 and the rear end of the undercover component 29. Furthermore, the floor pan component 27, the undercover component 29, and the rear bag 30 form a space 32 with an open top. A bumper (not shown) is fixed to the rear surface of the rear bag 30. Furthermore, a bumper cover 34, which forms part of the rear end of the vehicle body 12, is fixed to a bracket (not shown) fixed to the rear bag 30. As shown in FIG. 2, the front end (lower end) of the bumper cover 34 is formed by an inclined portion 35 that is inclined with respect to the horizontal plane HS in a side view. Furthermore, the front end of the inclined portion 35 is connected to the rear end of the undercover component 29, and the front end of the inclined portion 35 and the rear end of the undercover component 29 are fixed to each other. Furthermore, the lower surface of the inclined portion 35 and the lower surface of the rear end of the undercover component 29 are flush with each other.

[0019] 2, a back door 40 is provided at the rear of the vehicle body 12 and is positioned directly above the plastic unit 20 so as to be able to open and close. Therefore, when the back door 40 is in the open position, the plastic unit 20 can be exposed to the outside of the vehicle. Furthermore, when the vehicle 10 is viewed from the side, the left and right rear wheels 45 are located immediately in front of the plastic unit 20.

[0020] Among the components described above, the resin unit 20, the rear bag 30, and the bumper cover 34 are components of the vehicle underbody structure 50.

[0021] (Action and effect) Next, the operation and effects of this embodiment will be described.

[0022] The vehicle understructure 50 described above includes a resin unit 20 having a rear floor portion 22 supported by rear side members 16 provided at the rear of the body 12 of the vehicle 10, and an undercover portion 29 that forms the underside of the rear of the body 12 and is integrally molded with the rear floor portion 22. Therefore, the vehicle understructure 50 can have a smaller number of parts than when the member corresponding to the rear floor portion 22 and the member corresponding to the undercover portion 29 are configured as separate members.

[0023] Furthermore, a space 32 is formed by the floor pan component 27, the undercover portion 29, and the rear back 30. A spare tire, for example, can be stored in this space 32. Because the bottom of the space 32 is formed using the undercover portion 29 in this way, the vehicle undercarriage structure 50 has a simpler structure than when a space having a bottom is formed only by a rear floor portion that is formed separately from the undercover.

[0024] Furthermore, floor pan constituent portion 27 includes front wall portion (vertical wall portion) 27A, which is a plate-like portion extending substantially vertically downward from floor constituent portion 23. Therefore, floor pan constituent portion 27 can be formed into a deeply carved shape so as to be connected to undercover portion 29.

[0025] Furthermore, in the vehicle undercarriage structure 50, the lower surface of the inclined portion 35 and the lower surface of the rear end portion of the undercover portion 29 are flush with each other. Therefore, when the vehicle 10 is traveling, the undercover portion 29 and the bumper cover 34 can exhibit good aerodynamic characteristics.

[0026] The vehicle underbody structure 50 according to the embodiment has been described above, but the design thereof can be appropriately modified within the scope of the gist of the present invention.

[0027] For example, as in a modified vehicle undercarriage structure 50A shown in Fig. 3 , a rear edge portion 29A of an undercover portion 29 of a resin unit 20A may be formed to be positioned one step higher than other portions, a front edge portion 35A of an inclined portion 35 of a bumper cover 34A may be positioned directly below the rear edge portion 29A, and a portion of the undersurface of the undercover portion 29 located forward of the rear edge portion 29A may be positioned flush with the lower surface of the inclined portion 35. That is, the undercover portion 29 and the inclined portion 35 may be connected so that a portion of the undersurface of the undercover portion 29 located forward of the rear edge portion 29A and the lower surface of the inclined portion 35 are flush with each other. For example, through holes communicating with each other may be formed in the rear edge portion 29A and the front edge portion 35A, and the rear edge portion 29A and the front edge portion 35A may be fixed by a head portion 61 and a retaining portion 62 of a resin clip member 60 that passes through the through holes in the vertical direction.

[0028] A rib (not shown) extending along the front-rear direction in a plan view may be provided on the underside of the undercover portion 29. This improves the mechanical strength of the undercover portion 29 (resin unit 20, 20A) without reducing the aerodynamic performance of the undercover portion 29 (resin unit 20, 20A). Also, a rib (not shown) extending along the front-rear direction in a plan view may be provided on the underside of the inclined portion 35 of the bumper cover 34, 34A. This improves the mechanical strength of the bumper cover 34, 34A (inclined portion 35) without reducing the aerodynamic performance of the bumper cover 34, 34A (inclined portion 35). [Explanation of symbols]

[0029] 10 vehicles 20 20A Resin unit 22 Rear floor area 27 Floor pan components 27A Front wall (vertical wall) 29 Undercover section 34 34A Bumper Cover 50 50A Vehicle undercarriage

Claims

1. a rear floor portion made of resin and provided at the rear of the vehicle and having a floor pan component; a resin undercover portion that forms the lower surface of the rear portion and is integrally molded with the rear floor portion; A vehicle undercarriage comprising:

2. The vehicle underbody structure according to claim 1, wherein the floor pan component includes a vertical wall portion extending downward and having a lower end connected to the undercover portion.

3. a bumper cover provided at the rear portion, the front end of which is connected to the rear end of the undercover portion; 3. The vehicle underbody structure according to claim 1, wherein a lower surface of the rear end of the undercover portion and a lower surface of the front end of the bumper cover are flush with each other.

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