JP2013107592A - Vehicle battery mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vehicle battery mounting structure which can reduce vibration on a vehicle floor.SOLUTION: A pair of front battery brackets 60 and a pair of rear battery brackets 70 are provided in the center floor part 12C of a floor panel 12. The pair of front battery brackets 60 are arranged on a floor under reinforcement 30 in the center floor part 12C, while the pair rear battery brackets 70 are provided in the center cross member 20 in the center floor part 12C. A front bracket 42 provided in a battery case 42 and a rear bracket 46 are secured to the front battery brackets 60 and the rear battery brackets 70, respectively.

Description

  The present invention relates to a vehicle battery mounting structure.

  A vehicle battery mounting structure in which a battery is mounted between a vehicle floor and a seat cushion of a rear seat is known. (For example, Patent Documents 1 and 2).

JP 2001-113959 A JP 2001-126439 A

  However, with the above technology, there is room for improvement with respect to vibration of the vehicle floor.

  In view of the above facts, an object of the present invention is to obtain a vehicle battery mounting structure that can reduce vibration of a vehicle floor.

  The vehicle battery mounting structure according to claim 1 includes a battery disposed on a vehicle floor, a pair of side members respectively provided along both ends of the vehicle floor in the vehicle width direction, and the vehicle floor. A first cross member that extends in the vehicle width direction and connects the pair of side members; a rear side of the first cross member on the vehicle floor in the vehicle front-rear direction and an upper side in the vehicle vertical direction; A floor reinforcement provided between the second cross member extending in the width direction and connecting the pair of side members and the pair of side members on the vehicle floor and extending from the first cross member to the front side in the vehicle front-rear direction. And at least a portion is provided on the floor reinforcement in the vehicle floor, A front-side fixing portion to which the front end sides in both the front and rear directions are fixed, and at least a part is provided on the first cross member or the second cross member on the vehicle floor, and the rear end side in the vehicle front and rear direction of the battery is fixed And a rear fixing portion.

  According to the battery mounting structure for a vehicle according to claim 1, the front side fixing portion at least a part of which is provided on the floor reinforcement on the vehicle floor, and the first cross member or the second cross member on the vehicle floor. The battery is fixed to the rear side fixing portion provided with at least a part. Thus, the battery is supported by the floor reinforcement and the first cross member or the second cross member. Therefore, compared with the configuration in which the front side fixing portion is provided at a position off the floor reinforcement on the vehicle floor and the rear side fixing portion is provided at a position off the first cross member or the second cross member on the vehicle floor. Thus, the vibration of the battery is reduced. As a result, the vibration of the vehicle floor is reduced.

  The vehicle battery mounting structure according to claim 2 is the vehicle battery mounting structure according to claim 1, wherein the floor reinforcement penetrates between the vehicle floor and the first cross member, It is combined with the vehicle floor and the first cross member.

  According to the vehicle battery mounting structure of claim 2, the floor reinforcement is passed between the vehicle floor and the first cross member, and the vehicle floor, the first cross member, and the floor reinforcement are combined. This increases the rigidity of the vehicle floor. Therefore, the vibration of the vehicle floor is reduced as compared with a configuration in which the vehicle floor, the first cross member, and the floor reinforcement are not coupled.

  The vehicle battery mounting structure according to claim 3 is the vehicle battery mounting structure according to claim 2, wherein the first cross member extends in the vehicle width direction and is coupled to the vehicle floor. And a front flange portion that is disposed on the front side in the vehicle width direction of the rear flange portion, extends in the vehicle width direction, overlaps the vehicle floor and the floor reinforcement, and is coupled to the vehicle floor and the floor reinforcement. The front side fixing part is located on the front side in the vehicle front-rear direction with respect to the front end in the vehicle front-rear direction of the front flange part, and the rear side fixing part is located on the front end of the front flange part It is located on the rear side of the vehicle longitudinal direction.

  According to the vehicle battery mounting structure of the third aspect, the front side fixing portion is located on the front side in the vehicle front-rear direction with respect to the front end in the vehicle front-rear direction of the front flange portion of the first cross member. On the other hand, the rear side fixing portion is located on the rear side in the vehicle front-rear direction with respect to the front end of the front flange portion of the first cross member. That is, the front side fixing portion and the rear side fixing portion are respectively positioned on both sides in the vehicle front-rear direction with respect to the front end of the front flange portion of the first cross member.

  Here, the front flange portion of the first cross member is overlapped with the vehicle floor and the floor reinforcement, and is connected to the vehicle floor and the floor reinforcement. As a result, the rigidity in the vicinity of the front end of the front flange portion of the first cross member is increased, and when the vehicle floor vibrates, vibration nodes are likely to be generated in the vicinity of the front end.

  Therefore, as described above, the vehicle floor vibrates the front end of the front flange portion by positioning the front fixing portion and the rear fixing portion on both sides in the vehicle longitudinal direction with respect to the front end of the front flange portion of the first cross member. The rear fixing portion and the front fixing portion can be positioned on the antinodes of vibrations generated on both sides in the vehicle front-rear direction of the front end of the front flange portion. As a result, the vibration amplitude of the vehicle floor is reduced by the weight of the battery, so that the vibration of the vehicle floor can be efficiently reduced. Here, the vibration antinode means a portion other than the vibration node on the vehicle floor, and is not limited to the portion where the amplitude of the vibration is maximized.

  The vehicle battery mounting structure according to claim 4 is the vehicle battery mounting structure according to any one of claims 1 to 3, wherein the vehicle floor is arranged on the rear end side in the vehicle front-rear direction. A center floor portion provided with one cross member, a rear floor portion disposed on the rear side in the vehicle front-rear direction of the center floor portion and on the upper side in the vehicle vertical direction, and a fuel tank disposed on the lower side in the vehicle vertical direction; The battery is arranged on the center floor portion so that at least a part of the battery overlaps the fuel tank when viewed from the front-rear direction of the vehicle.

  According to the vehicle battery mounting structure of the fourth aspect of the present invention, the battery is disposed above the fuel tank in the vehicle vertical direction by arranging at least a part of the battery so as to overlap the fuel tank when viewed from the vehicle front-rear direction. The storage space in the vehicle vertical direction for the battery and the fuel tank can be reduced as compared with the arrangement. In other words, the battery and the fuel tank can be stored compactly in the vehicle vertical direction.

  The vehicle battery mounting structure according to claim 5 is the vehicle battery mounting structure according to any one of claims 1 to 4, wherein the floor reinforcement is arranged on a lower surface of the vehicle floor in a vehicle width direction. The vehicle floor is provided with the front fixing portion on each of the plurality of floor reinforcements, and the plurality of rear fixing portions are provided at intervals in the vehicle width direction. It has been.

  According to the vehicle battery mounting structure of the fifth aspect, the rigidity of the vehicle floor is improved by providing a plurality of floor reinforcements side by side in the vehicle width direction on the vehicle floor. Moreover, the support performance of a battery improves by providing multiple rear side fixing | fixed parts and front side fixing | fixed parts. Therefore, the vibration of the vehicle floor is reduced.

  The vehicle battery mounting structure according to claim 6 is the vehicle battery mounting structure according to any one of claims 1 to 5, wherein the vehicle floor has a front battery as the front fixing portion. A bracket is provided, and a rear battery bracket is provided as the rear fixing portion.

  According to the vehicle battery mounting structure of the sixth aspect, by providing the front battery bracket as the front fixing portion and the rear battery bracket as the rear fixing portion on the vehicle floor, Assembly is improved.

  As described above, the vehicle battery mounting structure according to the present invention can reduce the vibration of the vehicle floor.

1 is a perspective view showing a vehicle rear structure of a hybrid vehicle to which a vehicle battery mounting structure according to an embodiment of the present invention is applied. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 3 is a cross-sectional view corresponding to FIG. 2 schematically showing a state in which the center floor portion according to the present embodiment vibrates in the vehicle vertical direction. It is sectional drawing equivalent to FIG. 2 which shows the modification of the battery mounting structure for vehicles which concerns on one Embodiment of this invention.

  Hereinafter, a vehicle battery mounting structure according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that an arrow FR appropriately shown in each drawing indicates the front side in the vehicle front-rear direction, an arrow UP indicates the upper side in the vehicle vertical direction, and an arrow OUT indicates the outer side in the vehicle width direction (outside the passenger compartment).

  First, the configuration of the vehicle rear structure 10 of a hybrid vehicle to which the vehicle battery mounting structure according to the embodiment is applied will be described.

  As shown in FIG. 1, a vehicle rear portion structure 10 includes a floor panel 12 constituting a vehicle floor, a pair of rear side members 14 as side members, a center cross member 20 as a first cross member, and a second cross. A rear cross member 22 as a member and a pair of floor under reinforcements 30 as floor reinforcements are provided.

  Rear side members 14 are respectively provided at both ends of the floor panel 12 in the vehicle width direction. The pair of rear side members 14 are arranged with the longitudinal direction of the vehicle as a longitudinal direction, and constitute a lower skeleton in the side part of the vehicle body. Each rear side member 14 has an inner panel 14A formed in a cross-sectional hat shape opened to the outside in the vehicle width direction, and an outer panel (not shown) formed in a cross-sectional hat shape opened in the vehicle width direction. . The inner panel 14A and the outer panel are coupled in a state where the respective opening sides face each other, and form a closed cross-sectional structure.

  Each rear side member 14 has a rear portion 14R in the vehicle front-rear direction positioned on the inner side in the vehicle width direction with respect to a front portion 14F in the vehicle front-rear direction. The front portion 14F and the rear portion 14R are connected to the front portion 14F by a curved portion 14W that is curved in a convex shape toward the inside in the vehicle width direction and the upper side in the vehicle vertical direction.

  The curved portion 14W of each rear side member 14 is connected by a center cross member 20 constituting a skeleton at the lower part of the vehicle body. The center cross member 20 is disposed below the floor panel 12 in the vehicle vertical direction with the vehicle width direction as the longitudinal direction, and both ends in the longitudinal direction are coupled to the curved portion 14W of the rear side member 14 by welding or the like. Yes.

  As shown in FIG. 2, the center cross member 20 is formed in a cross-sectional hat shape having an opening on the floor panel 12 side (the upper side in the vehicle vertical direction). Specifically, the center cross member 20 extends from the front end in the vehicle front-rear direction of the main body 20A and the front end in the vehicle front-rear direction of the main body 20A having a substantially C-shaped cross section that opens on the floor panel 12 side. It has a front flange portion 20B that comes out, and a rear flange portion 20C that extends from the rear opening end of the main body portion 20A in the vehicle front-rear direction to the rear side in the vehicle front-rear direction. The front flange portion 20B and the rear flange portion 20C extend in the vehicle width direction along the opening ends of the main body portion 20A, and are joined to the lower surface of the floor panel 12 by welding or the like at important points. Thereby, the center cross member 20 and the floor panel 12 form a closed cross-sectional structure.

  A rear cross member 22 is provided on the rear side in the vehicle longitudinal direction of the center cross member 20 and on the upper side in the vehicle vertical direction. The rear cross member 22 is disposed below the floor panel 12 in the vehicle vertical direction with the vehicle width direction as the longitudinal direction, and both ends in the longitudinal direction are welded to the rear portion 14R (see FIG. 1) of the rear side member 14. Are combined. The rear cross member 22 is formed in a cross-sectional hat shape having an opening on the floor panel 12 side (front side in the vehicle front-rear direction). Each flange portion 22A of the rear cross member 22 is coupled to the lower surface of the floor panel 12 by welding or the like at important points. As a result, the rear cross member 22 and the floor panel 12 form a closed cross-sectional structure.

  Here, the floor panel 12 in this embodiment is formed of a thin steel plate, and extends from the center cross member 20 to the front side in the vehicle front-rear direction and from the rear cross member 22 to the rear side in the vehicle front-rear direction. The rear floor portion 12R has a step portion 12S that connects the center floor portion 12C and the rear floor portion 12R. The center floor portion 12C extends between the front portions 14F (see FIG. 1) of the pair of center cross members 20, and the center cross member 20 is provided on the rear end side in the vehicle front-rear direction. On the center floor portion 12C, a later-described hybrid battery 40 is disposed.

  The rear floor portion 12R is disposed on the rear side in the vehicle front-rear direction and on the upper side in the vehicle vertical direction of the center floor portion 12C, and extends between the rear portions 14R (see FIG. 1) of the pair of rear side members 14. That is, a step is formed between the center floor portion 12C and the rear floor portion 12R. A fuel tank 24 described later is disposed below the rear floor portion 12R in the vehicle vertical direction.

  The step portion 12S extends from the rear end of the center floor portion 12C in the vehicle front-rear direction to the upper side in the vehicle vertical direction, and is disposed across the center cross member 20 and the rear cross member 22. The front side of the fuel tank 24 in the vehicle front-rear direction is covered with the step 12S. A rear seat (not shown) is provided on the upper side of the stepped portion 12S in the vehicle vertical direction.

  The fuel tank 24 stores liquid fuel such as gasoline or light oil supplied to an internal combustion engine (not shown), and is disposed on the rear side of the center cross member 20 in the longitudinal direction of the vehicle and on the lower side of the rear floor portion 12R in the vertical direction of the vehicle. Has been. The fuel tank 24 is supported by the vehicle body via a support structure (not shown).

  As shown in FIG. 1, a pair of floor under reinforcements 30 that reinforce the floor panel 12 are provided between the rear side members 14. The pair of floor under reinforcements 30 are arranged side by side in the vehicle width direction and extend in the vehicle front-rear direction along the lower surface of the center floor portion 12C, and the center cross member 20 and the center cross member 20 in the vehicle front-rear direction It extends between the front cross member (not shown) arranged on the front side. That is, the floor under reinforcement 30 extends from the center cross member 20 to the front side in the vehicle front-rear direction.

  As shown in FIG. 3, the floor under reinforcement 30 is formed in a cross-sectional hat shape that opens on the floor panel 12 side (the upper side in the vehicle vertical direction). Specifically, the floor under reinforcement 30 includes a main body 30A having a substantially C-shaped cross section that opens on the floor panel 12 side, and an opening end on the inner side in the vehicle width direction of the main body 30A to the inner side in the vehicle width direction. It has an inner flange portion 30B that extends and an outer flange portion 30C that extends outward from the opening end of the main body portion 30A in the vehicle width direction to the outside in the vehicle width direction. The inner flange portion 30B and the outer flange portion 30C extend in the vehicle front-rear direction along each opening end of the main body portion 30A, and are joined to the lower surface of the center floor portion 12C by welding or the like at important points. Thus, a closed cross-sectional structure is configured by the center cross member 20 and the center floor portion 12C.

  As shown in FIG. 2, the rear end portion 30R of the floor under-reinforcement 30 in the vehicle front-rear direction penetrates between the center floor portion 12C and the center cross member 20, and the center floor portion 12C and the center The cross member 20 is coupled. Specifically, the joint portion 20K of the center cross member 20 with the rear end portion 30R of the floor under reinforcement 30R is curved in a convex shape downward in the vehicle vertical direction with respect to the floor panel 12. Thereby, the clearance gap is formed between the front side flange part 20B and the rear side flange part 20C in the coupling | bond part 20K, and the floor panel 12, and the rear-end part 30R of the floor under reinforcement 30 is penetrated by this clearance gap. . In the coupling portion 20K of the center cross member 20, the front flange portion 20B and the rear flange portion 20C are coupled to the main body portion 30A of the floor under reinforcement 30 by welding or the like.

  Although not shown in the drawings, in the portion where the front flange portion 20B of the center cross member 20 overlaps the inner flange portion 30B (see FIG. 3) of the floor under reinforcement 30, these front flange portion 20B, inner flange portion 30B, And the three pieces of the center floor portion 12C are overlapped (three overlaps), and are joined together by welding or the like. Similarly, in a portion where the front flange portion 20B of the center cross member 20 overlaps with the outer flange portion 30C (see FIG. 3) of the floor under reinforcement 30, these front flange portion 20B, outer flange portion 30C, and center floor Three pieces of the part 12C are overlapped (three overlaps), and are joined together by welding or the like. Thereby, as shown in FIG. 2, the rigidity in the vicinity of the front end 20B1 of the front flange portion 20B of the center cross member 20 in the center floor portion 12C is increased. Therefore, when the center floor portion 12C vibrates, the center floor portion 12C is easily bent in the vehicle vertical direction with the front end 20B1 of the front flange portion 20B of the center cross member 20 as a fulcrum. That is, a vibration node of the center floor portion 12C is likely to occur near the front end 20B1 of the front flange portion 20B of the center cross member 20.

  Next, a battery mounting structure will be described.

  As shown in FIG. 1, a hybrid battery 40 as a battery is disposed on the center floor portion 12 </ b> C of the floor panel 12. The hybrid battery 40 has a battery case 42 formed in a substantially rectangular parallelepiped shape with the vehicle width direction as a long side as a whole. The battery case 42 houses a storage battery (not shown) that stores electric power supplied to an electric motor as a drive source of the hybrid vehicle.

  A pair of front brackets 42 as front mounting portions are provided on the front side in the vehicle front-rear direction below the battery case 42. These front brackets 42 are arranged at a predetermined interval in the vehicle width direction, and extend from the battery case 42 to the lower side in the vehicle vertical direction and the front side in the vehicle front-rear direction. Each front bracket 42 is formed with two mounting holes 44 arranged in the vertical direction. On the other hand, a pair of rear brackets 46 are provided as rear mounting portions at the rear end of the vehicle front-rear direction at the lower portion of the battery case 42. These rear brackets 46 are arranged at predetermined intervals in the vehicle width direction. Each front bracket 42 has a mounting hole 50 formed therein.

  As shown in FIG. 2, the hybrid battery 40 configured in this way is arranged so that the rear end side in the vehicle longitudinal direction overlaps the center cross member 20 when viewed from the vehicle vertical direction, and the upper portion 40U thereof. Is disposed on the front side of the rear cross member 22 in the vehicle longitudinal direction. Furthermore, the hybrid battery 40 is arranged so that at least a lower portion 40L thereof overlaps the fuel tank 24 when viewed from the front-rear direction of the vehicle.

  On the other hand, as shown in FIG. 1, a pair of front battery brackets 60 and a pair of rear battery brackets 70 are provided on the center floor portion 12C. The pair of front battery brackets 60 are disposed on the floor under reinforcement 30 in the center floor portion 12C. That is, the front battery bracket 60 is disposed so as to overlap with the floor under reinforcement 30 when viewed from the vehicle vertical direction.

  As shown in FIG. 3, a pair of an inner flange portion 60 </ b> B and an outer flange portion 60 </ b> C coupled to the center floor portion 12 </ b> C are provided at the lower end portion of the front battery bracket 60. The inner flange portion 60B is overlaid on the inner flange portion 30B of the floor under reinforcement 30 via the center floor portion 12C, and is connected to the center floor portion 12C and the outer flange portion 30C by welding or the like. . Similarly, the outer flange portion 60C is overlaid on the outer flange portion 30C of the floor under reinforcement 30 via the center floor portion 12C, and is welded to the center floor portion 12C and the outer flange portion 30C. Are combined. Thus, a closed cross-section structure is configured by the front battery bracket 60 and the floor under reinforcement 30.

  Further, as shown in FIG. 2, the front battery bracket 60 has a mounting seat portion 60 </ b> A to which the front bracket 42 of the hybrid battery 40 is fixed. Two mounting holes 62 are formed in the mounting seat portion 60A side by side in the vertical direction. The front bracket 42 of the hybrid battery 40 is overlaid on the mounting seat 60A, and the front bracket 42 is fixed to the mounting seat 60A of the front battery bracket 60 by bolts 64 and nuts 66 penetrating the mounting holes 44 and 62. ing.

  On the other hand, as shown in FIG. 4, the rear battery bracket 70 is provided on the center cross member 20 on the lower surface of the center floor portion 12C. That is, the rear battery bracket 70 is disposed so as to overlap the center cross member 20 when viewed from the vehicle vertical direction.

  The rear battery bracket 70 is disposed between the center floor portion 12C and the center cross member 20, and is mounted on both the mounting seat portion 70A in which the mounting holes 72 are formed and both sides of the mounting seat portion 70A in the vehicle front-rear direction. It has a pair of provided front flange part 70B and rear flange part 70C. The front flange portion 70B is disposed between the center floor portion 12C and the front flange portion 20B of the center cross member 20, and is connected to the center floor portion 12C and the front flange portion 20B by welding or the like. Similarly, the rear flange portion 70C is disposed between the center floor portion 12C and the rear flange portion 20C of the center cross member 20, and is welded to the center floor portion 12C and the rear flange portion 20C. And so on. Thereby, the rear battery bracket 70 and the center cross member 20 form a closed cross-sectional structure.

  The rear bracket 46 of the hybrid battery 40 is superimposed on the mounting seat portion 70A of the rear battery bracket 70 via the center floor portion 12C, and is formed in the mounting holes 50 and 72 and the center floor portion 12C. The rear bracket 46 is fixed to the mounting seat portion 70 </ b> A of the rear battery bracket 70 by bolts 74 and nuts 76 that pass through the mounting holes 16.

  Between the rear battery bracket 70 and the center cross member 20, a front end 80F in the vehicle front-rear direction of the reinforcing member 80 that reinforces the step 12S of the floor panel 12 is disposed. The reinforcing member 80 extends in the vehicle vertical direction along the step portion 12S, and the rear end portion 80R in the vehicle front-rear direction is coupled to the lower surface of the rear floor portion 12R by welding or the like.

  Here, as shown in FIG. 2, the rear end side of the center floor portion 12 </ b> C in the vehicle front-rear direction is reinforced by the center cross member 20 as described above, and the front end of the front flange portion 20 </ b> B of the center cross member 20. A vibration node of the center floor portion 12C is likely to occur near 20B1. In the present embodiment, the front battery bracket 60 is disposed on the front side in the vehicle front-rear direction with respect to the front end 20B1 of the front flange portion 20B of the center cross member 20 where vibration nodes are likely to occur, and the vehicle front-rear direction. A rear battery bracket 70 is disposed on the rear side in the direction.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 1, in this embodiment, a hybrid battery 40 is disposed on the center floor portion 12 </ b> C of the floor panel 12. On the floor under reinforcement 30 in the center floor portion 12C, a front battery bracket 60 is provided. A rear battery bracket 70 is provided on the center cross member 20 in the center floor portion 12C. The front bracket 42 and the rear bracket 46 provided on the hybrid battery 40 are fixed to the front battery bracket 60 and the rear battery bracket 70, respectively.

  Thereby, the hybrid battery 40 is directly supported by the floor under reinforcement 30 and the center cross member 20. Accordingly, the front battery bracket 60 is provided at a position off the floor under reinforcement 30 in the center floor portion 12C, and the rear battery bracket 70 is provided at a position off the center cross member 20 in the center floor portion 12C. Compared to the configuration described above, vibration of the hybrid battery 40 is reduced. As a result, the vibration of the center floor portion 12C is reduced. In particular, it is possible to suppress the generation of a booming noise by reducing the low frequency vibration of the center floor portion 12C. Furthermore, since the front battery bracket 60 is provided on the floor under reinforcement 30 extending in the vehicle front-rear direction, the degree of freedom in installing the front battery bracket 60 in the vehicle front-rear direction is improved.

  Further, as shown in FIG. 2, in the present embodiment, the rear end portion 30R of the floor under reinforcement 30 passes between the center floor portion 12C and the coupling portion 20K of the center cross member 20, The rear end portion 30R is coupled to the center floor portion 12C and the coupling portion 20K of the center cross member 20. Thereby, since the rear end portion 30R of the floor under reinforcement 30 is restrained by the center floor portion 12C and the center cross member 20, the reinforcing effect of the floor under reinforcement 30 with respect to the center floor portion 12C is improved. Accordingly, since the rigidity of the center floor portion 12C is higher than the configuration in which the rear end portion 30R of the floor under reinforcement 30 is not coupled to the center floor portion 12C and the center cross member 20, the vibration of the center floor portion 12C is increased. Is further reduced.

  Here, FIG. 5 schematically shows a state in which the center floor portion 12C according to the present embodiment vibrates in the vehicle vertical direction as an example. As shown in FIG. 5, the rear end side of the center floor portion 12C in the vehicle front-rear direction is reinforced by the center cross member 20, and the center floor portion 12C is located near the front end 20B1 of the front flange portion 20B of the center cross member 20. Vibration nodes are likely to occur. Therefore, when the center floor portion 12C vibrates, the center floor portion 12C is easily bent in the vehicle vertical direction with the front end 20B1 of the front flange portion 20B of the center cross member 20 as a fulcrum as shown by a two-dot chain line. Yes. That is, in the center floor portion 12C, vibration nodes are likely to occur near the front end 20B1 of the front flange portion 20B of the center cross member 20. FIG. 5 shows a state in which a vibration node is generated at a portion of the center cross member 20 that is slightly separated from the front end 20B1 of the front flange portion 20B of the center cross member 20 to the front side in the vehicle longitudinal direction.

  Therefore, in the present embodiment, as shown in FIG. 2, the front battery bracket 60 is disposed on the front side in the vehicle front-rear direction of the front end 20B1 of the front flange portion 20B of the center cross member 20, and the front side of the center cross member 20 A rear battery bracket 70 is arranged on the rear side in the vehicle front-rear direction of the front end 20B1 of the flange portion 20B. That is, the front battery bracket 60 and the rear battery bracket 70 are arranged on both sides in the vehicle front-rear direction of the front end 20B1 of the front flange portion 20B of the center cross member 20 that easily causes vibration. As a result, when the center floor portion 12C vibrates with the vicinity of the front end 20B1 of the front flange portion 20B of the center cross member 20 as a vibration node, the amplitude of vibration antinodes generated on both sides in the vehicle front-rear direction of the front end 20B1 is reduced It is reduced by the weight of the bullet battery 40. Therefore, the vibration of the center floor portion 12C can be efficiently reduced. Here, the vibration antinode means a part other than the vibration node, and is not limited to the part where the amplitude of the vibration becomes maximum.

  Further, as described above, since the rear end portion 30R of the floor under-reinforcement 30 is coupled to the center floor portion 12C and the center cross member 20, the front end 20B1 of the front flange portion 20B of the center cross member 20 that easily becomes a vibration node. The rigidity of the nearby center floor portion 12C is increased. Therefore, the vibration of the center floor portion 12C is further reduced.

  Further, the hybrid battery 40 is arranged so that at least the lower part 40L thereof overlaps the fuel tank 24 when viewed from the vehicle front-rear direction. Therefore, the storage space in the vertical direction of the vehicle for the hybrid battery 40 and the fuel tank 24 can be reduced as compared with the configuration in which the hybrid battery 40 is arranged on the upper side of the vertical direction of the fuel tank 24 in the vehicle. In other words, the hybrid battery 40 and the fuel tank 24 can be stored compactly in the vehicle vertical direction.

  In the present embodiment, the rear battery bracket 70 and the front battery bracket 60 are provided on the center floor portion 12C, so that the assembly of the hybrid battery 40 to the center floor portion 12C is improved.

  Next, a modification of the above embodiment will be described.

  In the above embodiment, the rear battery bracket 70 as the rear fixing portion is provided on the center cross member 20 in the center floor portion 12C of the floor panel 12. However, the present invention is not limited to this. The rear side fixing portion only needs to be provided on the cross member that connects the rear side member in the vehicle width direction and forms the skeleton of the vehicle body. For example, the rear side fixing portion is provided on the rear cross member 22 of the floor panel 12. It may be provided.

  Specifically, as shown in FIG. 6, the rear battery bracket 90 as the rear side fixing portion is provided on the rear cross member 22 on the upper surface of the floor panel 12. That is, the rear battery bracket 90 is disposed so as to overlap the rear cross member 22 in the vehicle front-rear direction. The rear battery bracket 90 is disposed over the step 12S and the rear floor 12R of the floor panel 12, and includes a mounting seat 90A to which a rear bracket 48 of the hybrid battery 40 described later is fixed, and a mounting seat. The front flange portion 90B provided at the front end in the vehicle front-rear direction of the portion 90A and the rear flange portion 90C provided at the rear end in the vehicle front-rear direction of the mounting seat portion 90A. The front flange portion 90B and the rear flange portion 90C are overlapped with the flange portion 22A of the rear cross member 22 via the floor panel 12, and are connected to the floor panel 12 and the flange portion 22A by welding or the like. . Thus, the rear battery bracket 90 and the rear cross member 22 form a closed cross-sectional structure.

  On the other hand, a rear bracket 48 is provided on the rear end side in the vehicle front-rear direction in the upper portion 40U of the hybrid battery 40. The rear bracket 48 is overlapped with the mounting seat 90A of the rear battery bracket 90, and a rear battery bracket is formed by bolts 92 and nuts 94 passing through the mounting seat 90A and the rear bracket 48. A rear bracket 48 is fixed to 90. As a result, the rechargeable battery 40 is supported by the rear cross member 22 constituting the skeleton of the vehicle body via the rear battery bracket 90, so that the same action as in the above embodiment can be obtained.

  Even if the rear battery bracket 90 is provided on the rear cross member 22 of the floor panel 12, a vibration node of the center floor portion 12C is likely to occur near the front end 20B1 of the front flange portion 20B of the center cross member 20. There is no change. Further, in the modification shown in FIG. 6, the floor under reinforcement 30 and the rear cross member 22 are not coupled, but the rear end portion 30 </ b> R of the floor under reinforcement 30 is connected to the floor panel 12 and the rear cross member 22. The rear end portion 30R can be coupled to the floor panel 12 and the rear cross member 22 through the gap.

  Further, at least a part of the front battery bracket 60 in the above embodiment may be disposed on the floor under-reinforcement 30 in the center floor portion 12C, and the rear battery bracket 70 is at least a part thereof. What is necessary is just to be arrange | positioned on the center cross member 20 in the center floor part 12C. As a result, the load (weight) of the hybrid battery 40 is directly transmitted to the floor under reinforcement 30 and the center cross member 20 via the front battery bracket 60 and the rear battery bracket 70. 40 vibrations are reduced.

  Further, without providing the front battery bracket 60 on the center floor portion 12C, a mounting hole is formed on the center cross member 20 in the center floor portion 12C, and the front bracket 42 of the hybrid battery 40 is attached to the mounting hole with a bolt or the like. It may be fixed. In this case, the portion of the center floor portion 12C to which the front bracket 42 is fixed becomes the front fixing portion. The same applies to the rear fixing portion.

  Moreover, in the said embodiment, although the two floor under reinforcements 30 were provided in the center floor part 12C, the floor under reinforcement 30 should just be at least one. Further, in the above embodiment, the center cross member 20 as the first cross member, the rear cross member 22 as the second cross member, and the floor under reinforcement 30 as the floor reinforcement are provided on the lower surface of the center floor portion 12C. However, a center cross member 20, a rear cross member 22, and a floor up reinforcement as a floor reinforcement may be provided on the upper surface of the center floor portion 12C.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

12 Floor panel (vehicle floor)
12C Center floor portion 12R Rear floor portion 14 Rear side member (side member)
20 Center cross member (first cross member)
20C Rear flange portion 20B Front flange portion 20B1 Front end (front end of the front flange portion of the cross member)
22 Rear cross member (second cross member)
24 Fuel tank 30 Floor under reinforcement (floor reinforcement)
40 Hybrid battery (battery)
60 Front battery bracket (front fixing part)
70 Rear battery bracket (rear fixing part)
90 Rear battery bracket (rear fixing part)

Claims (6)

A battery located on the vehicle floor;
A pair of side members respectively provided along both ends of the vehicle floor in the vehicle width direction;
A first cross member provided on the vehicle floor, extending in the vehicle width direction and connecting the pair of side members;
A second cross member provided on a rear side of the first cross member on the vehicle floor in the vehicle front-rear direction and on an upper side in the vehicle vertical direction, extending in the vehicle width direction and connecting the pair of side members;
Floor reinforcement provided between the pair of side members on the vehicle floor and extending from the first cross member to the front side in the vehicle front-rear direction;
A front side fixing portion provided at least in part on the floor reinforcement in the vehicle floor, to which a front end side of the battery in the vehicle front-rear direction is fixed;
A rear side fixing portion provided at least in part on the first cross member or the second cross member on the vehicle floor, to which a rear end side of the battery in the vehicle front-rear direction is fixed;
A vehicle battery mounting structure comprising: The floor reinforcement penetrates between the vehicle floor and the first cross member, and is coupled to the vehicle floor and the first cross member.
The vehicle battery mounting structure according to claim 1. The first cross member is
A rear flange portion extending in the vehicle width direction and coupled to the vehicle floor;
A front flange portion disposed on the front side in the vehicle width direction of the rear flange portion, extending in the vehicle width direction and overlaid on the vehicle floor and the floor reinforcement and coupled to the vehicle floor and the floor reinforcement;
Have
The front fixing portion is located on the front side in the vehicle longitudinal direction with respect to the front end of the front flange portion in the vehicle longitudinal direction;
The rear side fixing portion is located on the rear side in the vehicle front-rear direction with respect to the front end of the front flange portion.
The vehicle battery mounting structure according to claim 2. The vehicle floor is
A center floor portion provided with the first cross member on the rear end side in the vehicle longitudinal direction;
A rear floor portion disposed behind the center floor portion in the vehicle front-rear direction and above the vehicle vertical direction, and a fuel tank disposed below the vehicle vertical direction;
Have
The battery is disposed on the center floor portion so that at least a part of the battery overlaps with the fuel tank when viewed from the vehicle front-rear direction.
The vehicle battery mounting structure according to any one of claims 1 to 3. A plurality of the floor reinforcements are provided side by side in the vehicle width direction on the lower surface of the vehicle floor,
The vehicle floor is provided with the front fixing portion on each of the plurality of floor reinforcements, and is provided with a plurality of the rear fixing portions at intervals in the vehicle width direction.
The vehicle battery mounting structure according to any one of claims 1 to 4. The vehicle floor is provided with a front battery bracket as the front fixing portion and a rear battery bracket as the rear fixing portion.
The vehicle battery mounting structure according to any one of claims 1 to 5.

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