Vehicle under structure

Abstract

A vehicle lower structure according to the present invention is provided with: a battery case disposed on the vehicle lower side of a floor panel; a battery support part for supporting the battery case; and a holder member attached to the vehicle upper side of the battery support section in a side view.

Description

Technical Field

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

[0002] Conventionally, the following structure has been known: In order to increase the rigidity against the tensile load applied from the seat belt to the seat belt holder, a reinforcing member is provided at the portion where the seat belt holder is installed (for example, refer to Japanese Unexamined Patent Application Publication No. 2019-156088). Summary of the Invention

[0003] However, if a reinforcing member for increasing rigidity is provided at the portion where a holder member such as a seat belt holder is installed, it will lead to an increase in vehicle weight and manufacturing cost.

[0004] Therefore, the present invention provides a vehicle underbody structure that can suppress an increase in vehicle weight and manufacturing cost, and can increase the rigidity against the load applied to the holder member.

[0005] The vehicle underbody structure according to the first aspect of the present invention includes: a battery box disposed on the vehicle lower side of the floor panel; a battery support portion that supports the battery box; and a holder member that is installed on the vehicle upper side of the battery support portion when viewed in side elevation.

[0006] According to the first aspect, a battery box is disposed on the vehicle lower side of the floor panel, and the battery box is supported by the battery support portion. Further, the holder member is installed on the vehicle upper side of the battery support portion when viewed in side elevation. Here, a load that always acts downward on the vehicle acts on the battery support portion through the battery box that houses the battery as a heavy object.

[0007] Therefore, even when a load acting toward the vehicle front side is applied to the holder member and transmitted to the battery support portion via the holder member, the battery support portion can easily withstand the load. That is to say, according to the first aspect, an increase in vehicle weight and manufacturing cost is suppressed, and the rigidity against the load applied to the holder member is increased.

[0008] In addition, based on the vehicle underbody structure of the first aspect, the vehicle underbody structure according to the second aspect of the present invention may be such that the battery support portion is configured to include the floor panel and a frame member attached to the floor panel, and when viewed in side elevation, a closed cross-section structure is formed by the floor panel and the frame member.

[0009] According to the second aspect, the battery support portion is configured to include the floor panel and a frame member attached to the floor panel, and a closed cross-section structure is formed by the floor panel and the frame member when viewed in side elevation. Therefore, the rigidity of the battery support portion is increased as compared with the case where the battery support portion does not form a closed cross-section structure when viewed in side elevation.

[0010] In addition, based on the vehicle underbody structure of the first or second mode, the vehicle underbody structure of the third mode according to the present invention may also be such that the battery support portion and the battery box are connected by a pair of support members, and a frame structure is formed by the battery support portion, the pair of support members, and the battery box.

[0011] According to the third mode, the battery support portion and the battery box are connected by a pair of support members. Thus, a frame structure is formed by the battery support portion, the pair of support members, and the battery box. Therefore, the body stiffness of the vehicle is effectively ensured.

[0012] In addition, based on any of the vehicle underbody structures of the first to third modes, the vehicle underbody structure of the fourth mode according to the present invention may also be such that the retainer member is mounted on the upper side of the vehicle of the battery support portion by a fastening member.

[0013] According to the fourth mode, the retainer member is mounted on the upper side of the vehicle of the battery support portion by a fastening member. Therefore, compared with the case where the retainer member is not mounted by fastening, for example, compared with the case of joining by an adhesive or the like, the load applied to the retainer member can be effectively received by the battery support portion.

[0014] In addition, based on the vehicle underbody structure of the fourth mode, the vehicle underbody structure of the fifth mode according to the present invention may also be such that the retainer member is a seat belt retainer.

[0015] According to the fifth mode, the retainer member is a seat belt retainer. Therefore, even when a load toward the front side of the vehicle is applied to the seat belt retainer during a frontal collision of the vehicle or the like, the load can be effectively received by the battery support portion.

[0016] In addition, based on the vehicle underbody structure of the fifth mode, the vehicle underbody structure of the sixth mode according to the present invention may also be such that the seat belt retainer is for the seat belt of the rear seat.

[0017] According to the sixth mode, the seat belt retainer is for the seat belt of the rear seat. Therefore, even when a load toward the front side of the vehicle is applied to each seat belt retainer by, for example, three passengers sitting in the rear seat during a frontal collision of the vehicle or the like, each load can be effectively received by the battery support portion.

[0018] As described above, according to the technical solution of the present invention, an increase in vehicle weight and manufacturing cost can be suppressed, and the stiffness against the load applied to the retainer member can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, the features, advantages, and technical and industrial significance of the embodiments of the present invention will be described with reference to the accompanying drawings, in which the same reference numerals denote the same components. Figure 1 is a side view schematic diagram of a part of a vehicle equipped with the vehicle lower structure according to the present embodiment. Figure 2 is a side view schematic diagram of the vehicle lower structure according to the present embodiment. Figure 3 is a rear view schematic diagram of the vehicle lower structure according to the present embodiment. Detailed Embodiments

[0020] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, for convenience of description, the arrow UP optionally marked in each drawing is set as the upward direction of the vehicle, the arrow FR is set as the forward direction of the vehicle, and the arrow RH is set as the rightward direction of the vehicle. Therefore, in the following description, in the case where the up and down, front and back, and left and right directions are described and there is no special description, it represents the up and down in the vehicle up and down direction, the front and back in the vehicle front and back direction, and the left and right in the vehicle left and right direction (vehicle width direction).

[0021] As Figure 1 shown, below the floor panel 14 of the vehicle 12 equipped with the vehicle lower structure 10 according to the present embodiment, a battery box 30 that houses a battery as a heavy object is disposed. That is, the vehicle 12 of the present embodiment is an electric vehicle or a hybrid vehicle (plug-in hybrid vehicle).

[0022] At the front side of the lower surface of the floor panel 14, a cross-sectionally closed beam 16 is installed, and the front end portion of the battery box 30 is supported by the beam 16. It should be noted that the battery box 30 is formed in a substantially flat rectangular shape, and a substantially flat plate-shaped rectangular lower cover 15 is provided below the battery box 30.

[0023] As Figure 1 , Figure 2 shown, at the rear side of the floor panel 14, when viewed in side view in the vehicle width direction, a longitudinal wall 14A that bends substantially upward along the wheelhouse of the rear wheel and a rear upper wall 14B that bends and extends rearward from the upper end portion of the longitudinal wall 14A are formed. And, on the lower surface of the rear upper wall 14B, a beam 22 as a frame member that is substantially hat-shaped in side cross-section is installed.

[0024] That is, in side view, the front and rear flange portions 22A at the upper end portion of the beam 22 are respectively joined to the lower surface of the rear upper wall 14B by welding or the like, and a closed cross-section structure is formed by the rear upper wall 14B of the floor panel 14 and the beam 22. It should be noted that the battery support portion 20 is configured to include the rear upper wall 14B of the floor panel 14 and the beam 22.

[0025] In addition, when viewed from the side, a part of the floor panel 14 that is in front of the longitudinal wall 14A and behind the center pillar 18 is provided with a support portion 14C that is bent into a substantially inverted "U" shape in a side cross-sectional view. The height position of the upper wall 14D of the support portion 14C is substantially the same as the height position of the rear upper wall 14B, and the upper wall 14D of the support portion 14C and the rear upper wall 14B support the seat cushion frame (seat cushion 42) of the rear seat vehicle seat 40.

[0026] As Figure 2 , Figure 3 shown, support brackets 24, which are a pair of left and right support members, are mounted on a cross beam 22 joined to the lower surface of the rear upper wall 14B of the floor panel 14. Each support bracket 24 is formed in a substantially "U" shape when viewed from the side, and its front and rear upper end portions 24A are joined to the front wall 22B and the rear wall 22C of the cross beam 22 by welding or the like.

[0027] In addition, each support bracket 24 is formed in a substantially isosceles trapezoid shape in which the length in the vehicle width direction of the upper end portion is longer than the length in the vehicle width direction of the lower end portion when viewed from the rear, and they are arranged at intervals in the vehicle width direction. And, a pair of left and right fixing portions 32 that are substantially "convex" - shaped when viewed from the rear are integrally formed at the rear end portion (rear part) of the battery box 30, and each fixing portion 32 is mounted (fastened) to the lower wall 24B of each support bracket 24 by fastening members 34 such as bolts and welding nuts.

[0028] That is to say, the cross beam 22 and the rear end portion (fixing portion 32) of the battery box 30 are connected by each support bracket 24, and the cross beam 22, each support bracket 24, and the rear end portion of the battery box 30 form a frame structure when viewed from the rear. Thus, a structure is formed in which the rear end portion of the battery box 30 is supported by the battery support portion 20 via a pair of left and right support brackets 24.

[0029] In addition, as Figure 2 shown, when viewed from the side, a flat - plate - shaped seat belt retainer 26, which is a retainer member, is mounted (fastened) to the upper surface of the rear upper wall 14B of the floor panel 14 between the front and rear flange portions 22A of the cross beam 22 by fastening members 36 such as bolts and welding nuts.

[0030] A slit - shaped through - hole (not shown) extending in the left - right direction is formed at the front end portion of the seat belt retainer 26, and one end of a webbing 28 is inserted through the through - hole for installation. And, a buckle 38 is mounted at the other end of the webbing 28.

[0031] It should be noted that the seat belt retainer 26 is used for the seat belt of the vehicle seat 40 on the rear seat that does not slide. Therefore, three such seat belt retainers 26 (the webbing 28 with the buckle 38 installed thereon) are provided for the seat belts of the occupants sitting on the vehicle seats 40 on the left and right sides of the rear seat, and for the seat belt of the occupant sitting on the vehicle seat 40 on the center side, respectively.

[0032] In addition, in Figure 1 , Figure 2 it is shown that the webbing 28 is arranged to extend from the side of the seat cushion 42 of the vehicle seat 40 on the rear seat towards the vehicle compartment, but the actual webbing 28 is arranged to extend from between the rear end of the seat cushion 42 and the lower end of the seat back 44 towards the vehicle compartment.

[0033] Next, the operation of the vehicle lower structure 10 according to the present embodiment having the above structure will be described.

[0034] As described above, the battery box 30 is disposed below the floor panel 14, and the rear end portion (fixing portion 32) of the battery box 30 is supported by the battery support portion 20 via a pair of left and right support brackets 24. And, in a side view, the seat belt retainer 26 that supports and mounts the webbing 28 with the buckle 38 is mounted on the upper side of the battery support portion 20 (the upper surface of the rear upper wall 14B of the floor panel 14 between the front and rear flange portions 22A of the cross member 22 in a side view).

[0035] Here, a load that uniformly acts downward acts on the battery support portion 20 through the battery box 30 that houses the battery as a heavy object. In other words, the battery support portion 20 is formed in a state of being constantly stretched downward through the battery box 30 that houses the battery as a heavy object.

[0036] Therefore, even in the case of, for example, a frontal collision of the vehicle 12, when an occupant (not shown) sitting on the vehicle seat 40 on the rear seat and wearing a seat belt stretches the webbing 28 forward (specifically, forward and upward), thereby applying a load forward (specifically, forward and upward) to the seat belt retainer 26 and transmitting the load forward (specifically, forward and upward) to the battery support portion 20 via the seat belt retainer 26, the battery support portion 20 can easily bear the load.

[0037] That is to say, in a side view, even if a reinforcing member for increasing rigidity is not provided on the rear upper wall 14B of the floor panel 14 between the front and rear flange portions 22A of the cross member 22, the battery support portion 20 can effectively receive the load applied to the seat belt retainer 26.

[0038] Thus, according to the vehicle underbody structure 10 according to the present embodiment, an increase in the weight of the vehicle 12 and an increase in the manufacturing cost can be suppressed or prevented (simplification of the body structure of the vehicle 12 is achieved), and the rigidity against the load applied to the seat belt holder 26 can be improved.

[0039] Moreover, the battery support portion 20 is configured to include a floor panel 14 and a cross member 22 mounted on the floor panel 14. When viewed from the side, the floor panel 14 and the cross member 22 form a closed cross-section structure. Therefore, compared with the case where the battery support portion 20 is not formed into a closed cross-section structure when viewed from the side, the rigidity of the battery support portion 20 can be improved, and sufficient endurance against the applied load can be ensured.

[0040] In addition, the battery support portion 20 and the rear end portion of the battery box 30 are connected by a pair of left and right support brackets 24. When viewed from the rear, the battery support portion 20, the pair of left and right support brackets 24, and the rear end portion of the battery box 30 form a frame structure. Therefore, the body rigidity of at least the rear portion of the vehicle 12 can also be effectively ensured.

[0041] In addition, the seat belt holder 26 is mounted on the upper side of the battery support portion 20 by a fastening member 36. Therefore, compared with the case where the seat belt holder 26 is not mounted by fastening, for example, compared with the case of joining by an adhesive or the like, the battery support portion 20 can effectively receive the load applied to the seat belt holder 26.

[0042] In addition, the seat belt holder 26 is used for the seat belt of the rear seat vehicle seat 40 that does not slide. Therefore, even in the event of a frontal collision of the vehicle 12 or the like, for example, three passengers (not shown) sitting on the rear seat vehicle seat 40 and wearing seat belts apply loads toward the front side (specifically, the upper front side) to each seat belt holder 26, and each load can be effectively received by one battery support portion 20.

[0043] As described above, the vehicle underbody structure 10 according to the present embodiment has been described with reference to the drawings. However, the vehicle underbody structure 10 according to the present embodiment is not limited to the illustrated structure, and design changes can be made as appropriate without departing from the gist of the present invention. For example, the fixture member is not limited to the seat belt holder 26, and the same applies to a child seat fixture (not shown).

[0044] In addition, the fixture member may further include, for example, a seat belt holder for fixing a wheelchair. Therefore, there may be a case where the battery support portion 20 is provided at the middle portion in the front-rear direction of the floor panel 14 or the like. In this case, the lower walls 24B of the pair of left and right support brackets 24 are respectively mounted on the left and right side portions of the battery box 30 or the like.

Claims

1. A vehicle lower structure, characterized in that: have: a battery box disposed on the vehicle underside of the floor panel; a battery support portion that supports the battery box; and The fixing member is mounted on the upper side of the battery support portion in a side view.

2. The vehicle lower structure according to claim 1, characterized in that: The battery support portion includes the floor panel and a frame member mounted on the floor panel. The battery support portion forms a closed cross-section structure with the floor panel and the frame member in a side view.

3. The vehicle lower structure according to claim 2, characterized in that: The battery support portion and the battery box are connected via a pair of support members. The battery support portion, the pair of support members, and the battery box form a frame structure.

4. The vehicle lower structure according to any one of claims 1 to 3, characterized in that: The fixture member is mounted on the vehicle upper side of the battery support portion by a fastening member.

5. The vehicle lower structure according to claim 4, characterized in that: The anchor component is a seat belt anchor.

6. The vehicle lower structure according to claim 5, characterized in that: The seat belt anchor is used for the seat belt of the rear seat.

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