JP2012171379A - Battery supporting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery supporting structure capable of surely supporting a battery even after a front-side frame is deformed by vehicle collision, without disturbing the deformation of the front-side frame.SOLUTION: In a battery supporting structure 1 having a front-side frame 3 and a battery bracket 4 mounted on the front-side frame so as to support a battery 5 in a car body, the front-side frame includes: a boundary line 13 which is formed by a load in collision more easily than other portions; a front part 11 which is positioned in front of the boundary line 13; and a rear part 12 which is positioned behind the boundary line. The battery bracket includes a front bracket 25 mounted in the front part and a rear bracket 26 mounted in the rear part and having higher rigidity than that of the front bracket, and the front bracket and the rear bracket are joined and arranged across the boundary line in a longitudinal direction.

Description

  The present invention relates to a battery support structure for supporting a battery with respect to a vehicle body in an engine room of an automobile.

  It is known that a battery for supplying electric power to various electrical components of an automobile is placed on a bracket attached to a front side frame (for example, Patent Document 1). In the battery support structure of Patent Document 1, a steel plate serving as a bracket is mounted on the upper surface and the inner surface of a front side frame having a substantially rectangular cross section, and the battery is placed on the bracket. The bracket has a fragile portion and can be deformed together with the front side frame without hindering deformation of the front side frame at the time of a vehicle collision. Thereby, the possibility that the battery support structure may deteriorate the impact absorption performance of the front side frame is reduced.

Japanese Patent No. 4601737

  However, in the battery support device described in Patent Document 1, the battery support portion of the bracket is formed from a single member and can be deformed together with the front side frame. It is hard to say that it can be held securely. In addition, when the front side frame is bent due to a vehicle collision, it is difficult to predict the follow-up of the bracket to the front side frame and the deformation associated therewith, and it is difficult to say that the battery can be securely held even after the vehicle collision. .

  The present invention has been made in view of the above problems, and does not hinder the deformation of the front side frame, and can reliably support the battery even after the deformation of the front side frame due to a vehicle collision. The task is to do.

  In order to solve the above problems, the present invention provides a front side frame (3) extending in the front-rear direction of a vehicle and a battery bracket ( 4), wherein the front side frame has a deformed portion (13) that is easier to deform than other portions due to a load at the time of a collision, and a front side of the deformed portion. A front bracket (25) having a first part (11) positioned and a second part (12) positioned rearward of the planned deformation portion, wherein the battery bracket is attached to the first part. And a rear bracket (26) attached to the second part and having a rigidity higher than that of the front bracket, and the front bracket and the rear bracket are joined to each other. Characterized in that it is arranged so as to straddle the predetermined deformation portion in the longitudinal direction.

  According to this configuration, when a vehicle collision occurs and the front side frame is deformed, the front bracket is deformed, or the joint portion between the front bracket and the rear bracket is broken, and the rear bracket is deformed. Since it is difficult, the battery is supported by the rear bracket even after a vehicle collision.

  In another aspect of the present invention, the joint portion (52) between the front bracket and the rear bracket is disposed at a portion corresponding to the planned deformation portion in the front-rear direction.

  According to this configuration, since the joint portion is close to the planned deformation portion, the joint portion is easily broken or deformed by deformation of the planned deformation portion at the time of a vehicle collision.

  In another aspect of the present invention, the front bracket and the rear bracket are made of a steel plate, and the front bracket is thinner than the rear bracket.

  According to this configuration, a rigidity difference between the front bracket and the rear bracket can be easily formed.

  In another aspect of the present invention, the front bracket extends from the first portion to the vehicle body inner side, and a tip thereof is bent at a right angle and extends rearward. The rear bracket extends from the second portion to the vehicle body inner side. And its front end is bent at a right angle and extends forward, and is joined to the rear end of the front bracket at the front end. The front bracket and the rear bracket cooperate with each other in a U-shaped horizontal cross-sectional shape. It is characterized by presenting.

  According to this configuration, the bracket can stably support the battery.

  According to another aspect of the present invention, the front bracket and the rear bracket each extend upward from a base end portion attached to the front side frame to form a base end extension portion (68, 69), An outer bracket (27) for connecting both base end extending portions is further provided.

  According to this configuration, the rigidity of the entire bracket can be increased by the outer bracket.

  In another aspect of the present invention, the outer bracket has at least one bent portion (61) extending in the vertical direction.

  According to this configuration, the rigidity of the outer bracket is increased, and the outer bracket is easily deformed starting from the bent portion when a load is applied during a vehicle collision.

  According to another aspect of the present invention, the front side frame has an upper surface facing upward with a ridge line (14) extending in the front-rear direction passing through the first portion, the deformable portion, and the second portion. (15) and an inner side surface (16) facing the vehicle interior, joined to a side column portion (18) extending in the vertical direction of a front bulkhead (6) formed in a rectangular frame shape at the front end portion The front bracket is joined to the inner side surface and the side column portion of the first portion, and the rear bracket is attached to the upper surface and the inner side surface of the second portion across the ridge line. It is characterized by being.

  According to this configuration, the front bracket and the rear bracket are securely attached to the front side frame and the front bulkhead, and the support rigidity of the battery is improved. Further, since the rear bracket is attached to the front side frame with two or more surfaces, the rear bracket can reliably support the battery even after a vehicle collision.

  Another aspect of the present invention is characterized in that the front bracket has at least one bent portion (41) extending in the vertical direction.

  According to this configuration, the rigidity of the front bracket is increased, and when a load is applied during a vehicle collision, the front bracket is easily deformed starting from the bent portion.

  According to the above configuration, the battery can be reliably supported even after the front side frame is deformed due to a vehicle collision without inhibiting the deformation of the front side frame.

Side view showing main part of vehicle front structure provided with battery support structure The top view which shows the principal part of the vehicle front part structure provided with the battery support structure The perspective view which shows the principal part of the vehicle front part structure provided with the battery support structure Bottom view showing the main part of the vehicle front structure with a battery support structure The perspective view which shows the principal part of the vehicle front part structure provided with the battery support structure The perspective view which shows the principal part of the vehicle front part structure provided with the battery support structure by removing the top plate The perspective view which shows the principal part of the vehicle front part structure provided with the battery support structure by removing the top plate VIII-VIII sectional view of FIG.

  Embodiments in which the present invention is applied to a vehicle body will be described in detail below with reference to the drawings. In the following description, the front-rear and left-right directions are defined based on the traveling direction of the vehicle, and the vertical direction is defined as the up-down direction.

  As shown in FIGS. 1 and 2, the battery support structure 1 includes a left front side frame 3 of a pair of left and right front side frames that form a part of the vehicle body front structure 2, and a battery bracket attached to the left front side frame 3. 4. The battery 5 is a known lead-acid battery, has a rectangular parallelepiped casing, and is placed on the battery bracket 4.

  The front side frame 3 extends in the front-rear direction in the vehicle body front part structure 2, the front end is joined to the front bulkhead 6, and the rear end is joined to the dash panel 7. The front side frame 3 is obtained by welding and press-molding steel plates having different thicknesses by a tailored blank method. The front portion 11 of the front side frame 3 is formed from a first steel plate having a small thickness, and the rear portion 12 is formed from a second steel plate having a thickness greater than that of the first steel plate. The 1st steel plate and the 2nd steel plate are joined by welding, and the boundary line 13 is formed in the junction part of the front part 11 and the rear part 12. FIG. In addition, the front part 11 and the rear part 12 may each be formed from a plurality of steel plates having different plate thicknesses. Both the front part 11 and the rear part 12 are formed in a substantially rectangular closed cross section, and the front side frame 3 has an upper surface 15 and an inner surface 16 via a ridge line 14 extending in the front-rear direction. Yes.

  When the front side frame 3 receives a load from the front side due to a collision, the front side frame 3 is bent and deformed with a boundary line 13 between the front part 11 and the rear part 12 as a starting point, and the front part 11 is compressed and deformed to absorb the load. In the present embodiment, the boundary line 13 is set as a planned deformation portion so as to be bent and deformed at the time of collision.

  The front bulkhead 6 extends in the left-right direction (vehicle width direction) and a pair of left and right front bulkhead side stays 18 extending in the vertical direction, and connects the upper ends of the pair of left and right front bulkhead side stays 18. A front bulkhead upper 19 and a front bulkhead lower 20 extending in the left-right direction and connecting between the lower ends of the pair of left and right front bulkhead side stays 18 are provided and have a substantially rectangular frame shape. The front end of the front side frame 3 is joined to the front bulkhead side stay 18.

  Further, a front side gusset 21 that extends outward and downward in the left-right direction is joined to the front end portion of the front side frame 3. A front end of an upper member (not shown) is joined to the front side gusset 21.

  As shown in FIGS. 1-8, the battery bracket 4 is formed by combining a front bracket 25, a rear bracket 26, an outer bracket 27, a connecting bracket 29, and a top plate 30 formed by pressing a steel plate. Yes. The rear bracket 26 is formed of a steel plate that is thicker than the front bracket 25 and the outer bracket 27.

  The front bracket 25 includes a flat plate-shaped base portion 33 that can contact the inner surface 16 of the front portion 11 of the front side frame 3, and a first side plate portion 34 that is bent at a right angle from one side edge of the base portion 33 and is continuous. The second side plate portion 35 is bent at a right angle from one side edge of the first side plate portion 34 and is continuous. The first side plate portion 34 is formed in a right triangle shape, and is continuous with the second side plate portion 35 on the oblique side. For this reason, the second side plate portion 35 is disposed to be inclined with respect to the base portion 33. The base 33 is formed with a bolt hole 36 through which a bolt (not shown) for fastening the front bracket 25 to the inner surface 16 of the front portion 11 is inserted.

  In a state where the base portion 33 is fastened to the inner side surface 16 of the front portion 11 of the front side frame 3 by a bolt, the first side plate portion 34 protrudes inward of the vehicle body from the inner side surface 16 of the front portion 11 and from the upper surface 15. Also, the second side plate part 35 is arranged so that the main surface faces obliquely downward and protrudes rearward from the oblique side of the first side plate part 34. The upper edge portions of the first side plate portion 34 and the second side plate portion 35 are bent in the horizontal direction to form flange portions 38 and 39. A plurality of bent portions 41 extending in the direction orthogonal to the front-rear direction are formed in the second side plate portion 35 including the flange portion 39. The bent portion 41 is a step portion formed into a convex shape or a concave shape by bending a steel plate, enhances the rigidity of the front bracket 25, and promotes deformation along the bent portion 41 when an excessive load is applied.

  The rear bracket 26 includes a third side plate portion 43 having a substantially right triangle shape and a fourth side plate portion 44 bent at a right angle along the oblique side of the third side plate portion 43. A rectangular notch is formed on one end side of the oblique side of the third side plate portion 43, and flange portions 46 and 47 cut and raised at right angles are formed on the edge of the notch. The flange portions 46 and 47 are arranged in a positional relationship orthogonal to each other. The flange portion 46 abuts on the inner surface 16 of the rear portion 12 of the front side frame 3 and the flange portion 47 can abut on the upper surface 15 of the rear portion 12. It has become. Bolt holes 48 and 49 are formed in the flange portions 46 and 47 (see FIGS. 5 and 6 in which the bolt 50 is omitted). The flange portions 46 and 47 are fastened to the upper surface 15 and the inner side surface 16 of the rear portion 12 by bolts 50.

  The flange portions 46 and 47 are bolted to the upper surface 15 and the inner side surface 16 of the rear portion 12, and the third side plate portion 43 protrudes inward of the vehicle body from the inner side surface 16 of the rear portion 12. The fourth side plate portion 44 is disposed so as to protrude upward, and the fourth side plate portion 44 is disposed so that the main surface faces obliquely downward and protrudes forward from the oblique side of the third side plate portion 43. The upper edge portion of the third side plate portion 43 is bent in the horizontal direction to form a flange portion 51. The flange portion 51 is formed with two bolt holes 54 welded to the weld nut 53 on the lower surface.

  The front edge of the fourth side plate portion 44 is disposed so as to overlap the vehicle inner side surface of the rear edge of the second side plate portion 35, and is joined to each other by welding. A joint portion between the second side plate portion 35 and the fourth side plate portion 44 is referred to as a joint portion 52. The front bracket 25 and the rear bracket 26 are connected via a joint portion 52 and have a U-shape when viewed from above. In other words, the front bracket 25 and the rear bracket 26 are attached to the front portion 11 of the front side frame 3 at the base portion 33 of the front bracket 25 and attached to the rear portion 12 at the flange portions 46 and 47 of the rear bracket 26. It arrange | positions so that the vehicle inner side (right side in a figure) of the boundary line 13 of the front side frame 3 may be straddled in the front-back direction. The joint portion 52 is disposed at a position corresponding to the boundary line 13 of the front side frame 3 in the front-rear direction.

  The outer bracket 27 extends in the up-down direction and the front-rear direction, and the upper edge portion 56, the lower edge portion 57, the front edge portion 58, and the rear edge portion 59 are bent to the vehicle outer side (left side in the illustrated example) to be flanged. Is forming. The outer bracket 27 is welded to the first side plate portion 34 at the front edge portion 58 and is welded to the third side plate portion 43 at the rear edge portion 59. More specifically, the front edge portion 58 of the outer bracket 27 is a portion that protrudes upward from the front side frame 3 of the first side plate portion 34, and is a side portion (base end extension portion) that is located outside the vehicle. ) Welded along 68, and the rear edge portion 59 is a portion protruding upward from the front side frame 3 of the third side plate portion 43, and is a side portion (base end extending portion) located on the vehicle outer side. It is welded along 69 (see FIG. 7). Thus, by connecting the front bracket 25 and the rear bracket 26 with the outer bracket 27, the battery bracket 4 forms a closed cross section with the front bracket 25, the rear bracket 26 and the outer bracket 27 in the horizontal cross section.

  The outer bracket 27 includes a plurality of bent portions 61 including the upper edge portion 56 and the lower edge portion 57 and extending in the up-down direction and the left-right direction (that is, the direction orthogonal to the front-rear direction). The bent portion 61 is a step portion formed into a convex shape or a concave shape by bending a steel plate, enhances the rigidity of the outer bracket 27, and promotes deformation along the bent portion 61 when an excessive load is applied. A through hole 62 is formed at an appropriate position of the outer bracket 27 for the purpose of adjusting the rigidity of the outer bracket. Further, a bolt hole 63 in which a weld nut (not shown) is welded to the lower surface is formed at the rear end portion of the upper edge portion 56.

  The connection bracket 29 is a steel plate bent in a substantially L shape, and its rear portion extends in the front-rear direction and is welded to the upper surface of the flange portion 38 of the front bracket 25 and the lower surface of the top plate 30 described later. The front portion extends upward, and a bolt (not shown) is inserted into a bolt hole 64 formed at the front end, and is bolted to the front bulkhead side stay 18. The connection bracket 29 is bent and raised at its edge for the purpose of increasing rigidity, and a plurality of recesses and projections are formed on the surface.

  The top plate 30 is a substantially rectangular steel plate, and the lower surface is the upper surface of the flange portions 38 and 39 of the front bracket 25, the upper surface of the rear portion of the connecting bracket 29, the upper surface of the flange portion 51 of the rear bracket 26, and the outer bracket 27. It is welded to the upper surface of the upper edge part 56, and is supported substantially horizontally. The welded portion between the top plate 30 and the flange portion 38 of the front bracket 25 and the rear portion of the connection bracket 29 is overlapped and welded so that the connection bracket 29 is sandwiched between the top plate 30 and the flange portion 38. Further, the top plate 30 includes bolt holes 66 at portions corresponding to the bolt holes 54 and 54 of the flange portion 51 of the rear bracket 26 and the bolt holes 63 of the upper edge portion 56 of the outer bracket 27. 51 and the upper edge portion 56 are fastened.

  For the purpose of enhancing the rigidity of the top plate 30, the outer edge of the vehicle is bent and raised, and a plurality of concave portions and convex portions extending in the vehicle width direction, that is, bent portions, are formed on the surface. The battery 5 is placed on the top board 30. The battery 5 may be fastened to the top plate 30 by a fastening band, or may be fastened to the top plate 30 using a U-shaped bolt-shaped fastening device.

  The battery support structure 1 configured as described above can support various types of batteries 5 from small to large by changing the sizes of the front bracket 25, the rear bracket 26, the outer bracket 27, and the top plate 30. it can. In particular, the battery support structure 1 supports the battery 5 because the front bracket 25, the rear bracket 26 and the outer bracket 27 form a closed ring and is connected to the front bulkhead side stay 18 via the connection bracket 29. Therefore, sufficient support rigidity can be ensured.

  When a load is applied to the front side frame 3 from the front due to a collision, the front bracket 25 and the outer bracket 27 are compressed along with the bending deformation starting from the boundary line 13 of the front side frame 3 and the compression deformation of the front portion 11. Deformation, breakage of the joint portion 52 between the front bracket 25 and the rear bracket 26, breakage of the welded portion of the front bracket 25, the outer bracket 27, the connection bracket 29, and the top plate 30 occur. It is designed not to disturb the deformation. On the other hand, since the rear bracket 26 is thicker than the front bracket 25, the rear bracket 26 has high rigidity and maintains its shape even when the front bracket 25 and the like are deformed. Since the rear bracket 26 and the top plate 30 are bolted together, it is easy to maintain the coupled state, and the top plate 30 is supported by the rear bracket 26 even after a collision. Therefore, the top plate 30 can easily maintain a horizontal state even after a collision, and can support the battery 5 so as not to drop off.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the connection bracket 29 and the outer bracket 27 can be omitted as appropriate in consideration of rigidity and the like. Further, the top plate 30 may be formed integrally with the rear bracket 26.

  DESCRIPTION OF SYMBOLS 1 ... Battery support structure, 2 ... Vehicle body front part structure, 3 ... Left front side frame, 4 ... Battery bracket, 5 ... Battery, 6 ... Front bulkhead, 7 ... Dash panel, 11 ... Front part (1st part), DESCRIPTION OF SYMBOLS 12 ... Rear part (2nd part), 13 ... Boundary line (scheduled part), 14 ... Ridge line, 15 ... Upper surface, 16 ... Inner side surface, 18 ... Front bulkhead side stay, 25 ... Front bracket, 26 ... Rear bracket, 27 ... Outer bracket, 29 ... Connecting bracket, 30 ... Top plate, 33 ... Base, 34 ... First side plate, 35 ... Second side plate, 38, 39 ... Flange, 41 ... Bent, 43 ... Third side plate , 44 ... fourth side plate part, 46, 47 ... flange part, 51 ... flange part, 52 ... joint part, 53 ... weld nut, 61 ... bent part, 68, 69 ... side part

Claims (8)

A battery support structure having a front side frame extending in the front-rear direction of the vehicle and a battery bracket attached to the front side frame to support the battery on the vehicle body,
The front side frame is positioned to be deformed more easily than other portions due to a load at the time of a collision, a first portion positioned on the front side of the planned deformation portion, and positioned on the rear side of the planned deformation portion. A second part,
The battery bracket includes a front bracket attached to the first portion and a rear bracket attached to the second portion and having higher rigidity than the front bracket, and the front bracket and the rear bracket are mutually connected. A battery support structure characterized in that the battery support structure is arranged so as to be joined and straddle the deformable portion in the front-rear direction.   2. The battery support structure according to claim 1, wherein a joint portion between the front bracket and the rear bracket is disposed at a portion corresponding to the planned deformation portion in the front-rear direction.   3. The battery support structure according to claim 1, wherein the front bracket and the rear bracket are formed of a steel plate, and the front bracket is thinner than the rear bracket. The front bracket extends from the first part to the inside of the vehicle body, and its front end is bent at a right angle and extends rearward.
The rear bracket extends from the second part to the vehicle body inner side, and its front end bends at a right angle and extends forward, and is joined to the rear end of the front bracket at the front end,
The battery support structure according to any one of claims 1 to 3, wherein the front bracket and the rear bracket cooperate to exhibit a U-shaped horizontal cross-sectional shape. The front bracket and the rear bracket each extend upward from a base end part attached to the front side frame to form a base end extension part,
The battery support structure according to claim 4, further comprising an outer bracket for connecting the base end extending portions to each other.   The battery support structure according to claim 5, wherein the outer bracket has at least one bent portion extending in a vertical direction. The front side frame has an upper surface facing upward and an inner surface facing the vehicle interior with a ridge line extending in the front-rear direction passing through the first portion, the deformable portion, and the second portion. And joined to the side column portion extending in the vertical direction of the front bulkhead formed in a rectangular frame shape at the front end portion,
The front bracket is joined to the inner side surface of the first portion and the side column portion,
The battery support structure according to any one of claims 1 to 6, wherein the rear bracket is attached to the upper surface and the inner side surface of the second portion across the ridgeline. .   The battery support structure according to any one of claims 1 to 7, wherein the front bracket has at least one bent portion extending in a vertical direction.

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