JP2013035410A - Battery mounting structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery mounting structure for vehicles configured to prevent a cross member from being bent due to a side impact while preventing damage to a side member.SOLUTION: A height Hof a cross-side connection part 42 of a front cross member 40 is set to be lower than a height Hof a side connection part 32 of the side member 30. A central axis Cof the cross-side connection part 42 is positioned on the lower side in a vehicle vertical direction than a central axis Cof the side connection part 32. The side connection part 32 and the cross-side connection part 42 are connected by a connection member 50. A region of the cross-side connection part 42 covered with a low part 50C of the connection member 50 is a fragile part 42W with small flexural capacity. In an upper wall 42U and a lower wall 42L of the fragile part 42W, first positioning holes 62 are formed, respectively. The upper wall 42U and the lower wall 42L of the fragile part 42W are connected by a connection rod 60 passing through the first positioning holes 62.

Description

  The present invention relates to a vehicle battery mounting structure.

  For example, Patent Document 1 discloses a battery frame mounting structure that supports a battery (battery) under the floor of an electric vehicle. The battery frame disclosed in Patent Document 1 includes a pair of left and right side members and a plurality of cross members that connect these side members.

JP 7-242125 A

  By the way, since the side member protects the battery from a vehicle side collision (side collision), the required cross-sectional area may be larger than that of the cross member. In this case, it is conceivable to secure a necessary cross-sectional area by making the height of the side member higher than the height of the cross member.

  However, in the case where the height of the side member is higher than the height of the cross member, when the protruding amount of the cross member protruding downward from the side member becomes large, the lower part of the side member comes into contact with the projection on the road surface. The side member may be damaged. On the other hand, when the amount of protrusion of the cross member protruding upward from the side member increases, for example, when a side collision load is applied to the side member arranged on the left side of the vehicle, the end of the cross member connected to the side member There is a possibility that a counterclockwise moment acts on the front side in the vehicle front-rear direction and the end of the cross member bends upward in the vehicle.

  In view of the above facts, an object of the present invention is to provide a vehicle battery mounting structure that can suppress the bending of a cross member due to a side collision while suppressing the damage of the side member.

  The vehicle battery mounting structure according to claim 1 is arranged on both sides in the vehicle width direction of the battery with the vehicle front-rear direction as a longitudinal direction in a plan view, and a pair of side members each formed in a cylindrical shape, The side member is connected in the vehicle width direction and is formed in a cylindrical shape, the height of the end portion is lower than the height of the connecting portion of the side member to which the end portion is connected, and the central axis of the end portion is A cross member positioned below the center axis of the connecting portion in the vehicle vertical direction, and a battery frame that supports the battery under the floor of the vehicle; the end portions of the cross member; and the side members of the side member An upper cover portion that covers the connecting portion from the upper side in the vehicle vertical direction; and an end portion of the cross member and a lower cover portion that covers the connecting portion from the lower side in the vehicle vertical direction, and the end portion of the cross member; The ream A connecting member for connecting the parts, at least partially provided in the end portion of the cross member includes a reinforcing member for connecting the upper and lower walls of the end portion.

  According to the vehicle battery mounting structure of the first aspect, the end portion of the cross member (hereinafter referred to as “cross-side connection portion”) has a height that is a connection portion (hereinafter referred to as “cross-side connection portion”) of the side member. It is made lower than the height of the “side-side connecting portion”. Further, the central axis of the cross-side connecting portion is positioned below the vehicle vertical direction with respect to the central axis of the side-side connecting portion. In other words, the central axis of the side-side connecting portion is positioned on the upper side in the vehicle vertical direction with respect to the central axis of the cross-side connecting portion. Thus, by arrange | positioning a cross side connection part and a side side connection part, a side side connection part does not protrude to the vehicle up-down direction lower side from a cross side connection part, or the protrusion amount becomes small. Therefore, it is possible to ensure the necessary cross-sectional area of the side-side connecting portion while suppressing damage to the side-side connecting portion due to contact with the projections on the road surface.

  Here, as described above, the central axis of the side-side connecting portion is located on the upper side in the vehicle vertical direction with respect to the central axis of the cross-side connecting portion. Therefore, for example, when a side impact load (a load directed from the outside in the vehicle width direction to the inside in the vehicle width direction) is applied to the side side connection portion of the side member arranged on the left side of the vehicle, the connection member is connected to the side side connection portion. A counterclockwise moment acts on the cross-side connecting portion as viewed from the front side in the vehicle longitudinal direction. Therefore, there is a possibility that the cross-side connecting portion is bent upward in the vehicle vertical direction.

  On the other hand, in the present invention, the upper wall and the lower wall of the cross-side connecting portion are connected by the reinforcing member. Thereby, the load input to the upper wall of the cross side connecting portion is transmitted to the lower wall of the cross side connecting portion via the reinforcing member. At this time, a moment counterclockwise to the counterclockwise moment acting on the cross-side connecting portion described above acts on the reinforcing member. This counterclockwise moment cancels the counterclockwise moment acting on the cross-side connecting portion, and the counterclockwise moment decreases. Therefore, bending of the cross side connecting portion is suppressed.

  Thus, according to the vehicle battery mounting structure of the present invention, it is possible to suppress the bending of the cross member due to the side collision while suppressing the damage of the side member.

  The vehicle battery mounting structure according to claim 2 is the vehicle battery mounting structure according to claim 1, wherein the upper cover portion and the lower cover portion are an upper wall and a lower wall of the end portion of the cross member. And a lap that is provided on the inner side in the vehicle width direction of the separation portion, and the upper cover portion and the lower cover portion are respectively overlapped with the upper wall and the lower wall of the end portion of the cross member. And the reinforcing member connects the upper wall and the lower wall of the cross member covered with the wrap portion.

  According to the vehicle battery mounting structure of the second aspect, in the separation portion, the upper cover portion and the lower cover portion are respectively separated from the upper wall and the lower wall of the end portion of the cross member. On the other hand, the upper cover part and the lower cover part of the wrap part overlap each other on the upper wall and the lower wall of the cross-side connecting part. Thereby, the bending strength of the site | part of the cross side connection part covered with the lap | wrap part is smaller than the bending strength of the site | part of the cross side connection part covered with the separation | spacing part. Therefore, when the counterclockwise moment described above acts on the cross-side connecting portion at the time of a side collision, the portion of the cross-side connecting portion covered with the wrap portion is easily bent.

  On the other hand, in the present invention, the upper wall and the lower wall of the cross-side connecting portion covered with the wrap portion are connected by the reinforcing member. That is, the portion of the cross side connecting portion covered with the wrap portion is reinforced by the reinforcing member. Therefore, it is possible to efficiently suppress the bending of the cross side connecting portion.

  The vehicle battery mounting structure according to claim 3 is the vehicle battery mounting structure according to claim 2, wherein the reinforcing member penetrates the end portion and the lap portion of the cross member in the vehicle vertical direction. The upper cover part and the lower cover part in the wrap part are connected.

  According to the vehicle battery mounting structure of the third aspect, the upper cover portion and the lower cover portion in the lap portion are connected by the reinforcing member. That is, the lap portion is reinforced by the reinforcing member. Therefore, the bending of the cross side connecting portion is further suppressed.

  A vehicle battery mounting structure according to a fourth aspect is the vehicle battery mounting structure according to the third aspect, wherein first positioning holes are respectively formed in an upper wall and a lower wall of the end portion of the cross member. The upper cover portion and the lower cover portion of the wrap portion are each formed with a second positioning hole that communicates with the first positioning hole and positions the wrap portion with respect to the end portion of the cross member. The reinforcing member is inserted into the first positioning hole and the second positioning hole.

  According to the vehicle battery mounting structure of the fourth aspect, the first positioning holes are respectively formed in the upper wall and the lower wall of the cross-side connecting portion. Further, a second positioning hole communicating with the first positioning hole is formed in the upper cover portion and the lower cover portion in the lap portion. The upper cover portion and the lower cover portion of the lap portion are connected to each other by the reinforcing members inserted into the first positioning hole and the second positioning hole.

  Here, for example, by inserting a positioning pin or the like into the first positioning hole and the second positioning hole, the lap portion is positioned with respect to the cross-side connecting portion. By using the first positioning hole and the second positioning hole for positioning as holes for inserting the reinforcing member, the manufacturing cost can be reduced.

  The vehicle battery mounting structure according to claim 5 is the vehicle battery mounting structure according to claim 4, wherein the connecting member includes the upper cover portion and the lower cover portion and the end of the cross member. The reinforcing member is welded along the edge of the second positioning hole formed in the upper cover portion and the lower cover portion.

  According to the vehicle battery mounting structure of the fifth aspect, by surrounding the outer peripheries of the cross-side connecting portion and the side-side connecting portion with the connecting member having a closed cross section, inundation such as rainwater into the connecting member is suppressed. . Therefore, corrosion and the like of the cross side connecting portion and the side side connecting portion are suppressed. Furthermore, the gap between the reinforcing member and the edge of the second positioning hole is closed by welding the reinforcing member along the edge of the second positioning hole formed in the upper cover portion and the lower cover portion in the lap portion. . Therefore, infiltration of rainwater or the like from the second positioning hole into the lap portion is suppressed, and thus corrosion or the like of the cross side connecting portion is further suppressed.

  The vehicle battery mounting structure according to claim 6 is the vehicle battery mounting structure according to any one of claims 2 to 5, wherein the end portion of the cross member and the connecting portion are the end portions. The lower surface of the connecting portion is flush with the lower surface of the cross member, and the lower cover portion of the separating portion is along the lower surface of the end portion of the cross member. The upper cover portion is inclined with respect to the outer end portion in the vehicle width direction so that the inner end portion in the vehicle width direction is located on the lower side in the vehicle vertical direction.

  According to the vehicle battery mounting structure of the sixth aspect, the cross-side connecting portion and the side-side connecting portion are arranged such that the lower surface of the side-side connecting portion is flush with the lower surface of the cross-side connecting portion. ing. That is, the lower surface of the side-side connecting portion does not protrude downward in the vehicle vertical direction from the lower surface of the cross-side connecting portion. Therefore, the breakage of the side-side connecting portion due to contact with the road surface protrusions and the like is suppressed.

  In addition, the lower cover portion in the separation portion extends along the lower surface of the cross-side connecting portion, while the upper cover portion in the separation portion has an inner end in the vehicle width direction lower than the outer end in the vehicle width direction. It is inclined to be located on the side. Accordingly, it is possible to suppress contact between the lower cover portion and the protrusion on the road surface in the separation portion while expanding the battery mounting space.

  As described above, according to the vehicle battery mounting structure of the present invention, it is possible to suppress bending of the cross member due to side collision while suppressing damage to the side member.

It is the side view which looked at the vehicle to which the battery mounting structure for vehicles which concerns on one Embodiment of this invention was applied from the vehicle width direction outer side (vehicle left side). It is a perspective view which shows the battery frame in one Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2 illustrating a connecting portion between a side member and a front cross member in an embodiment of the present invention. It is sectional drawing equivalent to FIG. 3 which shows the connection part of the side member and front cross member in a comparative example. It is a perspective view equivalent to the enlarged view of FIG. 1 which shows the modification of the reinforcement member in one Embodiment of this invention. It is sectional drawing equivalent to FIG. 3 which shows the modification of the reinforcement member in 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 LH indicates the vehicle width direction outer side (vehicle left side).

  FIG. 1 shows, as an example, a side view of a vehicle 12 to which a vehicle battery mounting structure 10 according to an embodiment is applied as viewed from the vehicle width direction outside (vehicle left side). As shown in FIG. 1, the vehicle 12 is an electric vehicle that runs using an electric motor (motor) (not shown) as a drive source, and a battery pack 14 as a battery in which electric power supplied to the electric motor is stored is mounted under the floor. Yes. That is, the vehicle battery mounting structure 10 according to the present embodiment is applied to the vehicle 12 in which the battery pack 14 is mounted on the lower side of the floor panel (not shown).

  As shown in FIG. 2, the vehicle battery mounting structure 10 includes a battery frame 16 that supports the battery pack 14 from the lower side in the vehicle vertical direction. The battery pack 14 is a case in which a plurality of rechargeable storage batteries (not shown) are housed in a case. In FIG. 2, the outer shape of the battery pack 14 is indicated by a two-dot chain line. The battery pack 14 is placed on the battery frame 16 and is fixed to the battery frame 16 with bolts or the like (not shown).

  The battery frame 16 includes a pair of left and right side members 30, a front cross member 40 that connects ends of the pair of left and right side members 30 on the front side in the vehicle front-rear direction, and a rear side in the vehicle front-rear direction of the pair of left and right side members 30. And a backboard 24 that connects the ends, and is configured in a frame shape so as to surround the battery pack 14 in plan view. The side member 30, the front cross member 40, and the back board 24 are provided with attachment portions 18A, 18B, and 18C, respectively. By attaching these attachment portions 18A, 18B, and 18C to a floor panel of a vehicle body (not shown), the battery frame 16 is attached to the floor panel of the vehicle body.

  A plurality (two in the present embodiment) of the sub cross members 20 are arranged between the front cross member 40 and the back board 24 with the vehicle width direction as the longitudinal direction. These sub-cross members 20 connect the middle portions of the pair of left and right side members 30 in the vehicle front-rear direction. Further, the front cross member 40, the sub cross member 20, and the back board 24 are connected to each other by a plurality of (two in this embodiment) amber members 22 extending in the vehicle front-rear direction.

  Here, the side member 30, the front cross member 40, and the connecting member 50 that connects the side member 30 and the front cross member 40 will be described in detail.

  The pair of left and right side members 30 are formed of a tubular steel member having a substantially rectangular cross-sectional shape, and are arranged on both sides in the vehicle width direction of the battery pack 14 in a plan view, with the vehicle front-rear direction being the longitudinal direction. Yes. Thereby, the collision object contacts the side member 30 before the battery pack 14 at the time of a side collision. Further, a front cross member 40 as a cross member is disposed between the end portions of the side members 30 on the front side in the vehicle front-rear direction. The front cross member 40 is formed of a cylindrical steel member having a substantially rectangular cross-sectional shape, and is arranged with the vehicle width direction as a longitudinal direction.

  FIG. 3 shows a cross section taken along line 3-3 of FIG. 2 (cross section along the vehicle width direction). As shown in FIG. 3, the end of the side member 30 on the front side in the vehicle front-rear direction is connected to the end of the front cross member 40 in the longitudinal direction (hereinafter, this end is referred to as “cross-side connecting portion 42”). (Hereinafter, this connecting portion is referred to as “side-side connecting portion 32”).

The cross-side connecting portion 42 is abutted against the side wall 32S of the side-side connecting portion 32 on the inner side in the vehicle width direction. Further, the cross-side connecting portion 42 is lower than its height (length in the vehicle vertical direction) H ₂ is the height of the side-side connecting portion 32 (the length in the vehicle vertical direction) H _1. In other words, the side-side connecting portion 32 has a height H ₁ higher than the height H ₂ of the cross-side connecting portion 42. Thereby, the required cross-sectional area of the side side connection part 32 with respect to the side collision load F (load which acts toward the vehicle width direction inner side from the vehicle width direction outer side) is ensured.

The cross-side connecting portion 42 is arranged so that the lower surface 42L1 of the lower wall 42L thereof is flush with the lower surface 32L1 of the lower wall 32L of the side-side connecting portion 32. The portion 32 protrudes upward in the vehicle vertical direction. Thus, the central axis C ₂ of the cross-side connecting portion 42 is positioned in the vehicle vertical direction lower side from the center axis C ₁ of the side-side connecting portion 32. Here, the term “equal” does not mean exact flush, but is a concept including a shift due to an assembly error or the like.

  The cross-side connecting portion 42 and the side-side connecting portion 32 thus configured are connected by a connecting member 50 as shown in FIG. The connecting member 50 is curved in a substantially L shape in plan view, and is provided across the side-side connecting portion 32 and the cross-side connecting portion 42. The connecting member 50 includes an upper cover body 52 and a lower cover body 54.

  The upper cover body 52 has a substantially C-shaped cross section and is arranged with the opening facing downward in the vehicle vertical direction, and covers the side-side coupling portion 32 and the cross-side coupling portion 42 from the vehicle vertical direction upper side. Yes. The lower cover body 54 has a substantially C-shaped cross section and is disposed with the opening facing upward in the vehicle vertical direction, and covers the side-side coupling portion 32 and the cross-side coupling portion 42 from the vehicle vertical direction lower side. ing. The upper cover body 52 and the lower cover body 54 are arranged in a state where the side walls 52S and 54S are overlapped, and the overlapped side walls 52S and 54S are joined together by welding or the like. As a result, the upper cover body 52 and the lower cover body 54 form a closed cross section that surrounds the outer periphery of the side connection part 32 and the cross connection part 42. Further, by joining the side walls 52S and 54S of the upper cover body 52 and the lower cover body 54 together by welding or the like, inundation of rain water or the like from the joint between the side walls 52S and 54S into the connecting member 50 is suppressed. ing.

  As shown in FIG. 2, the connecting member 50 has an end 50T1 on the rear side in the vehicle front-rear direction joined to the side-side connecting portion 32 by welding or the like, and an end 50T2 on the inner side in the vehicle width direction. The cross-side connecting portion 42 is joined by welding or the like. As a result, the side-side connecting portion 32 and the cross-side connecting portion 42 are connected via the connecting member 50, and inundation of rainwater or the like from the end portions 50T1 and 50T2 of the connecting member 50 into the connecting member 50 is suppressed. ing.

Here, as shown in FIG. 3, the connecting member 50 has a height (length in the vehicle vertical direction) corresponding to the heights H ₁ and H ₂ of the side-side connecting portion 32 and the cross-side connecting portion 42. It has changed. In other words, the distance between the upper cover portion 52 </ b> U that forms the upper wall of the upper cover body 52 and the lower cover portion 54 </ b> L that forms the lower wall of the lower cover body 54 is the side-side connecting portion 32 and the cross-side connecting portion 42. Varies depending on the heights H ₁ and H ₂ .

  Specifically, a portion that covers the side-side coupling portion 32 of the coupling member 50 from both sides in the vehicle vertical direction is the high-level portion 50A. On the other hand, a portion of the connecting member 50 that covers the fragile portion 42W of the cross-side connecting portion 42 from both sides in the vehicle vertical direction is a low-order portion 50C serving as a wrap portion having a height lower than that of the high-order portion 50A. The weak part 42W will be described later. Further, the height of the portion of the connecting member 50 between the high-order part 50A and the low-order part 50C gradually decreases from the high-order part 50A to the low-order part 50C (from the vehicle width direction outside to the vehicle width direction inside). It is a cross-sectional reduction part 50B as a separation part.

  50 A of high rank parts are comprised by the outer side part 52UA of the vehicle width direction outer side in the upper side cover part 52U, and the outer side part 54LA of the vehicle width direction outer side in the lower side cover part 54L. Moreover, the height of the high-order part 50A is made higher than the height of the low-order part 50C. The outer portion 52UA and the outer portion 54LA are provided along the upper wall 32U and the lower wall 32L of the side-side connecting portion 32. Further, the distance between the outer portion 52UA and the outer portion 54LA is substantially constant.

  On the other hand, the lower portion 50C includes an inner portion 52UC on the inner side in the vehicle width direction of the upper cover portion 52U and an inner portion 54LC on the inner side in the vehicle width direction of the lower cover portion 54L. The inner portion 52UC and the inner portion 54LC are overlapped with the upper wall 42U and the lower wall 42L of the cross-side connecting portion 42, respectively, and the intervals are substantially constant.

The height of the cross-sectionally reduced portion 50B gradually decreases from the high portion 50A toward the low portion 50C, and the middle portion 52UB in the middle of the vehicle width direction in the upper cover portion 52U and the vehicle width in the lower cover portion 54L. It is comprised by the intermediate part 54LB of the direction middle. The intermediate portion 52UB of the upper cover portion 52U is an inclined portion that is inclined so that the end portion 52UB2 on the inner side in the vehicle width direction is positioned on the lower side in the vehicle vertical direction with respect to the end portion 52UB1 on the outer side in the vehicle width direction. Yes. The intermediate portion 52UB absorbs the height difference (H ₁ −H ₂ ) between the side-side connecting portion 32 and the cross-side connecting portion 42. On the other hand, the intermediate portion 54LB of the lower cover portion 54L is provided along the lower wall 42L of the cross-side connecting portion 42. Accordingly, the interval K between the intermediate portions 52UB and 54LB of the upper cover portion 52U and the lower cover portion 54L is gradually narrowed toward the inner side in the vehicle width direction, and the cross section of the cross-sectional reduction portion 50B along the vehicle width direction. The shape (cross-sectional shape shown in FIG. 3) is gradually reduced as it goes inward in the vehicle width direction. Further, in the reduced cross-section portion 50B, the intermediate portions 52UB and 54LB of the upper cover portion 52U and the lower cover portion 54L are separated from the upper wall 42U and the lower wall 42L of the cross-side connecting portion 42, respectively.

  Here, the portion of the cross-side connecting portion 42 covered with the lower portion 50C as the wrap portion is a fragile portion whose bending strength is smaller than the bending strength of the portion of the cross-side connecting portion 42 covered with the reduced cross-section portion 50B. 42W. This weak part 42W is reinforced by the connecting rod 60 as a reinforcing member. Specifically, first positioning holes 62 are formed in the upper wall 42U and the lower wall 42L of the fragile portion 42W. In addition, second positioning holes 64 communicating with the first positioning holes 62 are formed in the inner side portions 52UC and 54LC of the upper cover portion 52U and the lower cover portion 54L constituting the lower position portion 50C, respectively. The connecting rod 60 is inserted into the first positioning hole 62 and the second positioning hole 64.

  The connecting rod 60 is formed of a cylindrical steel member, and an intermediate portion in the longitudinal direction thereof is located between the upper wall 42U and the lower wall 42L of the fragile portion 42W. Further, both ends in the longitudinal direction of the connecting rod 60 are welded along edges of the second positioning holes 64 formed in the inner portions 52UC and 54LC of the upper cover portion 52U and the lower cover portion 54L, respectively. The connecting rod 60 connects the inner portion 52UC of the upper cover body 52 and the inner portion 54LC of the lower cover body 54 constituting the lower portion 50C, and the upper wall 42U and the lower wall 42L of the fragile portion 42W. It is connected. Thereby, the bending strength of the weak part 42W is large.

  The first positioning hole 62 and the second positioning hole 64 are used as positioning holes for positioning the upper cover body 52 and the lower cover body 54 with respect to the cross-side connecting portion 42. Specifically, when the upper cover body 52 and the lower cover body 54 are attached to the cross-side connecting portion 42, positioning pins or the like (not shown) are inserted into the first positioning holes 62 and the second positioning holes 64. The In this state, the side wall 52S of the upper cover body 52 and the side wall 54S of the lower cover body 54 are overlapped and joined by welding or the like, and the connecting member 50 constituted by the upper cover body 52 and the lower cover body 54 Both end portions 50T1 and 50T2 (see FIG. 2) are joined to the side-side connecting portion 32 and the cross-side connecting portion 42 by welding or the like. Thereby, the side side connection part 32 and the cross side connection part 42 are connected via the connection member 50. Thereafter, the connecting rod 60 is inserted into the first positioning hole 62 and the second positioning hole 64 in place of a positioning pin (not shown) and the like, and formed on the inner portions 52UC and 54LC of the upper cover portion 52U and the lower cover portion 54L, respectively. The both ends of the connecting rod 60 in the longitudinal direction are welded along the edge of the second positioning hole 64 formed. As a result, the weakened portion 42 </ b> W of the cross-side connecting portion 42 is reinforced by the connecting rod 60.

  Positioning holes are respectively formed in the side connection part 32, the upper cover body 52, and the lower cover body 54, and the upper cover body 52 and the lower side are formed with respect to the side connection part 32 by the same procedure as described above. It is also possible to position the cover body 54. Further, the shape of the connecting rod 60 is not limited to a cylindrical shape, and may be a prismatic shape, for example.

  Next, the operation according to this embodiment will be described.

As shown in FIG. 3, the cross-side connecting portion 42 has a height H ₂ lower than the height H ₁ of the side-side connecting portion 32. Further, the cross-side connecting portion 42 is disposed so that the lower surface 42L1 thereof is flush with the lower surface 32L1 of the side-side connecting portion 32. In other words, the side-side connecting portion 32 is disposed so as not to protrude downward from the cross-side connecting portion 42 in the vehicle vertical direction. Therefore, it is possible to secure the necessary cross-sectional area of the side-side connecting portion 32 while suppressing damage to the side-side connecting portion 32 due to contact with projections or the like on the road surface (not shown).

  Further, the cross-side connecting portion 42 and the side-side connecting portion 32 are connected via a connecting member 50. The connecting member 50 has a closed cross section that surrounds the outer peripheries of the side-side connecting portion 32 and the cross-side connecting portion 42, and both end portions 50T1 and 50T2 are respectively welded to the side-side connecting portion 32 and the cross-side connecting portion 42 by welding or the like. It is joined. Thereby, inundation such as rainwater into the connecting member 50 is suppressed. Therefore, since the corrosion of the side-side connecting portion 32 and the cross-side connecting portion 42 is suppressed, the durability of the battery frame 16 is improved.

  Further, in the cross-section reducing portion 50B of the connecting member 50, the intermediate portion 54LB of the lower cover portion 54L is along the lower wall 42L of the cross side connecting portion 42, while the intermediate portion 52UB of the upper cover portion 52U is the outer side in the vehicle width direction. Inclined so that the end 52UB2 on the inner side in the vehicle width direction is located on the lower side in the vehicle vertical direction with respect to the end 52UB1. Thereby, the mounting space of the battery pack 14 can be expanded while suppressing damage to the intermediate portion 54LB of the lower cover body 54 due to contact with a projection or the like on a road surface (not shown).

Here, the central axis C ₂ of the cross-side connecting portion 42 is positioned in the vehicle vertical direction lower side from the center axis C ₁ of the side-side connecting portion 32. In other words, the center axis C ₁ of the side-side connecting portion 32 is located above the center axis C ₂ of the cross-side connecting portion 42 in the vehicle vertical direction. Therefore, for example, as in the comparative example shown in FIG. 4, due to a side collision or the like, from the vehicle width direction outer side toward the vehicle width direction inner side with respect to the side side connection portion 32 of the side member 30 disposed on the left side of the vehicle. When the side impact load F is applied, a counterclockwise (counterclockwise) moment M is applied to the cross-side connecting portion 42 as viewed from the front side in the vehicle front-rear direction.

Further, the height of the connecting member 50 changes according to the heights H ₁ and H ₂ of the side-side connecting portion 32 and the cross-side connecting portion 42, and is minimum at the lower portion 50C as the wrap portion. . Therefore, the fragile portion 42W of the cross-side connecting portion 42 covered with the lower portion 50C has a smaller bending strength than the portion of the cross-side connecting portion 42 covered with the cross-sectional reduced portion 50B. Therefore, as in the comparative example shown in FIG. 4, when the moment M acts on the cross-side connecting portion 42, the cross-side connecting portion 42 may be bent at the fragile portion 42W. In particular, the load f ₁ input to the intermediate portion 52UB of the upper cover portion 52U is likely to concentrate around the boundary portion between the cross-section reduced portion 50B and the lower portion 50C, and the boundary as shown by the two-dot chain line in FIG. There is a possibility that the weak part 42W bends around the part. In the comparative example shown in FIG. 4, the first positioning hole 62 and the second positioning hole 64 are filled with the weld metal 100.

On the other hand, in this embodiment, as shown in FIG. 3, the lower portion 50 </ b> C and the fragile portion 42 </ b> W are reinforced by the connecting rod 60. Specifically, the upper portion 52U and the inner portions 52LC of the upper cover portion 52U and the lower cover portion 54L constituting the lower portion 50C are connected by the connecting rod 60, and the upper wall 42U and the lower wall 42L of the fragile portion 42W. And are connected. Thus, a portion of the upper wall 42U load transmitted to the inner portion 52UC and weak portions 42W of the upper cover portion 52U is, the lower wall 42L of the fragile portion 42W via the connecting rod 60 as indicated by an arrow _{f 2} And transmitted to the inner portion 54LC of the lower cover portion 54L. In this case, the connecting rod 60, the moment M _R clockwise as viewed from the rear direction front vehicle (clockwise) acts. Since part of the moment M _R moment acts on the fragile portion 42W by M (see FIG. 4) is canceled out, the moment M decreases. Therefore, the bending of the fragile portion 42W of the cross side connecting portion 42 is suppressed.

  In the present embodiment, the first positioning hole 62 and the second positioning hole 64 for positioning the upper cover body 52 and the lower cover body 54 with respect to the cross-side connecting portion 42 are attached to the connecting rod 60. By diverting it as a hole, the manufacturing cost can be reduced.

  Further, both end portions in the longitudinal direction of the connecting rod 60 are respectively along the edges of the second positioning holes 64 formed in the inner cover portions 52UC and 54LC of the upper cover portion 52U and the lower cover portion 54L constituting the lower portion 50C. Welded. As a result, the gap between the connecting rod 60 and the second positioning hole 64 is closed, so that inundation such as rainwater from the second positioning hole 64 into the connecting member 50 is suppressed. Therefore, since the corrosion of the side-side connecting portion 32 and the cross-side connecting portion 42 is suppressed, the durability of the battery frame 16 is improved. Further, by inserting the connecting rod 60 into the first positioning hole 62 and the second positioning hole 64, the first positioning hole 62 and the second positioning hole 64 are filled with the weld metal 100 as in the comparative example shown in FIG. There is no need. Therefore, the manufacturing cost can be reduced.

  Thus, according to the vehicle battery mounting structure 10 according to the present embodiment, it is possible to suppress the bending of the front cross member 40 due to a side collision while suppressing the breakage of the side member 30.

  Next, a modified example of the vehicle battery mounting structure according to the embodiment will be described.

  In the said embodiment, although the connection rod 60 was used as a reinforcement member, it is not restricted to this. For example, as shown in FIGS. 5 and 6, a bulk 70 may be used as the reinforcing member. Specifically, the bulk 70 is formed of a tubular steel member having a substantially rectangular cross-sectional shape, and the fragile portion 42W of the cross-side connecting portion 42 (the longitudinal direction (axial direction) is the vehicle front-rear direction). (See FIG. 6).

  As shown in FIG. 6, the upper wall 70 </ b> U of the bulk 70 and the upper wall 42 </ b> U of the fragile portion 42 </ b> W are welded along the inner peripheral surface of the first positioning hole 62. Thereby, inundation such as rainwater from the first positioning hole 62 into the fragile portion 42 </ b> W is suppressed. Similarly, the lower wall 70L of the bulk 70 and the lower wall 42L of the fragile portion 42W are welded along the inner peripheral surface of the first positioning hole 62. Thereby, inundation such as rainwater from the first positioning hole 62 into the fragile portion 42 </ b> W is suppressed. The bulk 70 connects the upper wall 42U and the lower wall 42L of the fragile portion 42W. The inner peripheral surface of the first positioning hole 62 and the inner peripheral surface of the second positioning hole 64 are also joined by welding or the like. Thereby, inundation such as rainwater from the second positioning hole 64 into the connecting member 50 is also suppressed.

  Thus, by connecting the upper wall 42U and the lower wall 42L of the fragile portion 42W in the cross-side coupling portion 42 by the bulk 70, the bending strength of the fragile portion 42W with respect to the moment M (see FIG. 4) is improved. Therefore, the same operation and effect as the above-described embodiment can be obtained. The shape of the bulk 70 is not limited to the cylindrical shape described above, and may be, for example, a substantially C-shaped cross section.

Moreover, in the said embodiment, as FIG. 3 shows, although the side side connection part 32 and the cross side connection part 42 are arrange | positioned so that each lower surface 32L1, 42L1 may become the same, this Not exclusively. A-side connecting portion 32 and the cross-side connecting portion 42, it is arranged so that the center axis C ₂ of the cross-side connecting portion 42 is positioned in the vehicle vertical direction lower side from the center axis C ₁ of the side-side connecting portion 32 For example, the lower surface 32L1 of the side-side connecting portion 32 may be located below the lower surface 42L1 of the cross-side connecting portion 42 in the vehicle vertical direction, or conversely, the lower surface 42L1 of the cross-side connecting portion 42 It may be located on the upper side in the vehicle vertical direction. By positioning in the vehicle vertical direction lower side from the center axis C ₁ of the central axis C ₂ of the cross-side connecting portion 42-side connecting portion 32, the vehicle vertical direction lower side side connecting portion 32 from the cross-side connecting portion 42 The protrusion amount can be reduced without protruding to the side. Therefore, it is possible to secure the necessary cross-sectional area of the side-side connecting portion 32 while suppressing damage to the side-side connecting portion 32 due to contact with the projections on the road surface.

  Further, in the cross-section reducing portion 50B, it is sufficient that the intermediate portions 52UB and 54LB of the upper cover portion 52U and the lower cover portion 54L are separated from the upper wall 42U and the lower wall 42L of the cross-side connecting portion 42, respectively. It is not restricted to what was mentioned above. For example, in the above-described embodiment, the intermediate portion 52UB of the upper cover portion 52U is inclined, but the intermediate portion 52UB may be curved. Further, in the cross-section reducing portion 50B, not only the intermediate portion 52UB of the upper cover portion 52U but also the intermediate portion 54LB of the lower cover portion 54L may be inclined. For example, in the configuration in which the side-side connecting portion 32 protrudes downward from the cross-side connecting portion 42 in the vehicle vertical direction, there is a step between the lower wall 32L of the side-side connecting portion 32 and the lower wall 42L of the cross-side connecting portion 42. It is formed. In such a configuration, the end portion on the inner side in the vehicle width direction of the intermediate portion 54LB of the lower cover portion 54L constituting the cross-section reducing portion 50B is positioned on the upper side in the vehicle vertical direction with respect to the end portion on the outer side in the vehicle width direction. You may incline like this. Thereby, while absorbing the level | step difference between the lower wall 32L of the side side connection part 32 mentioned above and the lower wall 42L of the cross side connection part 42, the intermediate | middle of the lower cover part 54L by contact with the protrusion of a road surface, etc. Damage to the portion 54LB can be suppressed.

  Moreover, in the said embodiment, although the side walls 52S and 54S of the upper side cover body 52 and the lower side cover body 54 were joined, the connection member 50 which has a closed cross section was comprised, but it is not restricted to this. The connecting member 50 only needs to be able to connect the side-side connecting portion 32 and the cross-side connecting portion 42 with a predetermined strength. For example, even if the side walls 52S and 54S of the upper cover body 52 and the lower cover body 54 are omitted. good. However, as described above, the side walls 52S and 54S of the upper cover body 52 and the lower cover body 54 are joined together to form a closed cross-section, and by surrounding the outer periphery of the side-side connecting portion 32 and the cross-side connecting portion 42, While the connection strength of the side side connection part 32 and the cross side connection part 42 can be improved, corrosion of the side side connection part 32 and the cross side connection part 42 can be suppressed.

  Furthermore, in the above embodiment, the connecting portion between the side member 30 and the front cross member 40 has been described as an example. However, the above embodiment also applies to a connecting portion between the side member 30 and the sub cross member 20 as a cross member. Is possible.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and the above 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.

10. Vehicle battery mounting structure 14 Battery pack (battery)
16 Battery frame 30 Side member 32 Side side connection part (side member connection part)
40 Front cross member (cross member)
42 Cross side connection (end of cross member)
50 Connecting member 50B Cross section reduced portion (spaced portion)
50C Low part (lap part)
52U Upper cover part 52UB Middle part (inclined part)
54U Lower cover part 60 Connecting rod (reinforcing member)
62 1st positioning hole 64 2nd positioning hole 70 Bulk (reinforcing member)
C ₁ center axis C ₂ center axis

Claims (6)

In a plan view, the vehicle longitudinal direction is arranged on both sides in the vehicle width direction of the battery, and a pair of side members each formed in a tubular shape, and the pair of side members are connected in the vehicle width direction and formed in a tubular shape. The vehicle is formed such that the height of the end portion is lower than the height of the connecting portion of the side member to which the end portion is connected, and the central axis of the end portion is higher than the central axis of the connecting portion of the side member. A battery frame having a cross member positioned on the lower side in the vertical direction and supporting the battery under the floor of the vehicle;
An upper cover portion that covers the end portion and the connecting portion of the cross member from above in the vehicle vertical direction; and a lower cover portion that covers the end portion and the connection portion of the cross member from below in the vehicle vertical direction. A connecting member for connecting the end of the cross member and the connecting portion;
A reinforcing member that is provided at least in part in the end of the cross member and connects the upper wall and the lower wall of the end;
A vehicle battery mounting structure comprising: The connecting member is
A spacing portion provided on the cross member side, wherein the upper cover portion and the lower cover portion are spaced apart from the upper wall and the lower wall of the end portion of the cross member;
A wrap portion provided on the inner side in the vehicle width direction of the spacing portion, wherein the upper cover portion and the lower cover portion are respectively overlapped with an upper wall and a lower wall of the end portion of the cross member;
Have
The vehicle battery mounting structure according to claim 1, wherein the reinforcing member connects an upper wall and a lower wall of the cross member covered with the wrap portion.   The vehicle according to claim 2, wherein the reinforcing member penetrates the end portion of the cross member and the wrap portion in the vehicle vertical direction and connects the upper cover portion and the lower cover portion in the wrap portion. Battery mounting structure. First positioning holes are respectively formed in the upper wall and the lower wall at the end of the cross member,
The upper cover portion and the lower cover portion in the wrap portion are each formed with a second positioning hole that leads to the first positioning hole and positions the wrap portion with respect to the end portion of the cross member,
The vehicle battery mounting structure according to claim 3, wherein the reinforcing member is inserted into the first positioning hole and the second positioning hole. The connecting member includes the upper cover portion and the lower cover portion, and has a closed cross section that surrounds the outer end of the cross member and the outer periphery of the connecting portion,
The vehicle battery mounting structure according to claim 4, wherein the reinforcing member is welded along an edge of the second positioning hole formed in the upper cover portion and the lower cover portion. The end portion of the cross member and the connecting portion are arranged such that the lower surface of the connecting portion is flush with the lower surface of the end portion,
The lower cover portion in the spacing portion is along the lower surface of the end portion of the cross member;
The said upper side cover part in the said separation part inclines so that the edge part inside a vehicle width direction may be located in the vehicle up-down direction lower side with respect to the edge part outside a vehicle width direction. 2. A vehicle battery mounting structure according to item 1.

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