JP2020001527A - Vehicle battery pack support device - Google Patents

Abstract

To provide a vehicle battery pack support device capable of reducing production cost while coping with various rigidity requirements.SOLUTION: A support device 80 is the support device 80 for suspending a battery pack 70 to side rails 11 forming a ladder frame 10 of a vehicle 1, and comprises: a frame side bracket 81 coupled to a web 11w of each side rail 11; and an elastic coupling part 83 for coupling the frame side bracket 81 and the battery pack 70 elastically. The frame side bracket 81 is formed by laminating folded plurality of plate-shaped members so as to form a bracket back surface 81a coupled to the web 11w, a bracket bottom surface 81b for supporting the elastic coupling part 83 while being continuous and orthogonal to the bracket back surface 81a, and a bracket side surface 81c orthogonal to both of the bracket back surface 81a and the bracket bottom surface 81b and being continuous thereto.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a battery pack support device for a vehicle.

  Conventionally, electric vehicles that use a motor as a driving power source instead of an internal combustion engine such as an engine, and a hybrid vehicle that uses the internal combustion engine and the motor in combination, focusing on the viewpoint of reducing the environmental load The development of is progressing. In particular, in these electric vehicles, a driving battery is mounted to drive the motor, and by supplying power from the battery to the motor, power required to run the vehicle is obtained. . In recent years, such electric vehicles have been developed in the field of commercial vehicles such as trucks. For example, Patent Document 1 discloses a holding structure for holding a driving battery pack on a ladder frame of an electric truck.

JP 2016-113063 A

  By the way, in general, the ladder frame of the truck has a rigidity capable of stably supporting the weight of the vehicle, but also has a flexibility that allows a small amount of torsion or bending, so that, for example, an impact force received from a road surface during traveling. It is designed to absorb On the other hand, the battery pack supported by the ladder frame via the support device is not designed on the assumption that stress due to deformation of the ladder frame is input. For this reason, in order to reduce the stress transmitted from the ladder frame to the battery pack, it is necessary to take measures such as adopting a configuration in which the displacement can be absorbed through an elastic body.

  However, since such a support device has different rigidity requirements depending on the weight of the battery pack and the connection direction between the ladder frame and the battery pack, the manufacturing cost may increase if the support device is designed and manufactured for each specification. Occurs.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a vehicle battery pack support device that can reduce manufacturing costs while meeting various rigidity requirements. Is to do.

<First embodiment of the present invention>
A vehicle battery pack support device according to a first aspect of the present invention is a vehicle battery pack support device that suspends a battery pack on a side rail that forms a ladder frame of a vehicle, and is connected to an outer surface of the side rail. A frame-side bracket, and an elastic connecting portion for elastically connecting the frame-side bracket and the battery pack, wherein the frame-side bracket has a bracket rear surface connected to the outer side surface and a bracket rear surface connected to the outer surface. A plurality of bent plate-like members are formed so that a bracket bottom surface that supports the elastic connecting portion while being orthogonal and continuous, and a bracket side surface that is continuous and orthogonal to both the bracket back surface and the bracket bottom surface are formed. It is laminated.

  The vehicle battery pack support device suspends a battery pack mounted on a vehicle on a side rail via a frame-side bracket and an elastic connecting portion. Here, the frame side bracket is continuous while being orthogonal to both the bracket back surface that forms the connection surface with the outer surface of the side rail, the bracket bottom surface that forms the connection surface with the elastic connection portion, and both the bracket back surface and the bracket bottom surface. Consisting of side brackets. The frame-side bracket is formed of a plurality of plate-like members each having a bent back surface, a bottom surface of the bracket, and a side surface of the bracket, and is integrally formed by stacking these members. Thus, the frame-side bracket can adjust the rigidity required in suspending the battery pack by adjusting the number of plate-like members to be stacked. Further, the frame-side bracket can be formed by processing a common plate material for all of the plurality of plate-like members to be laminated. Therefore, the vehicle battery pack supporting device can reduce manufacturing costs while meeting various rigidity requirements.

<Second embodiment of the present invention>
In the vehicle battery pack support device according to a second aspect of the present invention, in the above-described first aspect of the present invention, the number of the plate-shaped members stacked on the bracket side surface may be different for each part.

  According to the vehicular battery pack support device according to the second aspect of the present invention, the bracket side surface of the frame-side bracket has a portion that increases rigidity by increasing the number of stacked plate members, and a stack of plate members. By reducing the number of sheets, it is possible to form a portion for reducing the weight.

<Third embodiment of the present invention>
According to the battery pack support device for a vehicle according to the third aspect of the present invention, in the above-described second aspect of the present invention, the bracket side surface has a boundary with the bracket rear surface and a boundary with the bracket bottom surface. In a region including a corner portion to be formed, the number of laminated plate members may be the largest.

  According to the vehicular battery pack supporting device according to the third aspect of the present invention, the bracket side faces are stacked with the largest number of plate members in a region where stress is most concentrated in supporting the battery pack, thereby enhancing rigidity. can do.

<Fourth aspect of the present invention>
In the vehicle battery pack supporting device according to a fourth aspect of the present invention, in the above-described third aspect of the present invention, the bracket side surface is formed by stacking the plate-like members in a direction away from the side rail. The number may be reduced.

  According to the battery pack supporting device for a vehicle according to the fourth aspect of the present invention, the bracket side faces are separated from the side rails with respect to the connection surface between the side rail and the frame side bracket that are relatively easily stressed. As the number of laminated plate members decreases, the weight can be efficiently reduced in accordance with the relaxation of the stress.

<Fifth aspect of the present invention>
In the vehicle battery pack support device according to a fifth aspect of the present invention, in the above-described third aspect of the present invention, the side surface of the bracket is provided with the plate-like member in a direction away from the elastic connecting portion. The number of layers may be reduced.

  According to the battery pack supporting device for a vehicle according to the fifth aspect of the present invention, the side surface of the bracket is separated from the elastic connection portion with respect to the connection surface between the elastic connection portion and the frame-side bracket that are relatively easily subjected to stress. By reducing the number of stacked plate members in the direction, it is possible to efficiently reduce the weight according to the relaxation of the stress.

<Sixth aspect of the present invention>
In the vehicle battery pack support device according to a sixth aspect of the present invention, in the above-described third to fifth aspects of the present invention, in the bracket side surface, the region may be such that the region is the same as the vehicle height direction. It may extend to a position higher than the bottom surface of the side rail.

  According to the battery pack supporting device for a vehicle according to the sixth aspect of the present invention, even if stress is concentrated on a position corresponding to the height of the bottom surface of the side rail, the position on the bracket rear surface of the bracket on the frame side bracket is The frame-side bracket can be reinforced in the most rigid region of the side surface.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view schematically showing an overall configuration of a vehicle on which a vehicle battery pack support device according to the present invention is mounted. FIG. 2 is a perspective view illustrating a schematic shape of a battery pack mounted on a vehicle. It is a perspective view which shows the structure and connection form of the support device which connects a side rail and a battery pack. 1 is an exploded perspective view partially showing a support device according to the present invention. It is an exploded perspective view of a frame side bracket. It is a side view which shows typically the structure of the support apparatus seen from the vehicle front-back direction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the content described below, and can be arbitrarily changed and implemented without changing the gist. Further, the drawings used in the description of the embodiments each schematically show constituent members, and partial emphasis, enlargement, reduction, or omission is performed for better understanding. In some cases, the scale, shape, and the like are not accurately represented.

  FIG. 1 is a top view schematically showing an overall configuration of a vehicle 1 on which a vehicle battery pack supporting device according to the present invention is mounted. As shown in FIG. 1, a vehicle 1 according to the present embodiment includes a ladder frame 10, a cab 20, a packing box 30, a wheel mechanism 40, a driving unit 50, a driving power supply unit 60, a battery pack 70, and a “vehicle battery”. This is an electric truck including a support device 80 as a “pack support device”. Note that FIG. 1 shows a top view when the cab 20 and the packing box 30 are seen through the top surface of the vehicle 1.

  In the present embodiment, the vehicle 1 is assumed to be an electric vehicle including an electric motor (a motor 51 described later) as a driving source for traveling, but may be a hybrid vehicle further including an engine. Further, the vehicle 1 is not limited to an electric truck, and may be another commercial vehicle including a battery for driving the vehicle, such as an electric garbage truck.

  The ladder frame 10 has a side rail 11 and a plurality of cross members 12. The side rails 11 extend along the vehicle front-rear direction X of the vehicle 1 and include a left side rail 11L and a right side rail 11R arranged in parallel with each other in the vehicle width direction Y. The plurality of cross members 12 connect the left side rail 11L and the right side rail 11R. That is, the ladder frame 10 constitutes a so-called ladder type frame. The ladder frame 10 supports the cab 20, the packing box 30, the drive unit 50, the drive power supply unit 60, the battery pack 70, and other heavy objects mounted on the vehicle 1.

  The cab 20 is a structure including a driver's seat (not shown), and is provided above a front portion of the ladder frame 10. On the other hand, the packing box 30 is a structure on which luggage and the like conveyed by the vehicle 1 are stacked, and is provided above a rear portion of the ladder frame 10.

  In the present embodiment, the wheel mechanism 40 includes left and right front wheels 41 located in front of the vehicle, a front axle 42 as an axle of the two front wheels 41, and two rear wheels 43 located behind and located on the left and right of the vehicle. , And a rear axle 44 as an axle of the rear wheel 43. Then, in the vehicle 1 according to the present embodiment, the driving force is transmitted so that the rear wheel 43 functions as a driving wheel, and the vehicle 1 runs. The wheel mechanism 40 is suspended on the ladder frame 10 via a suspension mechanism (not shown), and supports the weight of the vehicle 1.

  The drive unit 50 has a motor 51, a speed reduction mechanism 52, and a differential mechanism 53. The motor 51 generates a driving force necessary for the vehicle 1 to travel when AC power is supplied from a driving power supply unit 60 described later. The reduction mechanism 52 includes a plurality of gears (not shown), and reduces the rotational torque input from the motor 51 and outputs the reduced rotation torque to the differential mechanism 53. The differential mechanism 53 distributes the power input from the speed reduction mechanism 52 to the left and right rear wheels 43. That is, the drive unit 50 transmits the driving force to the rear axle 44 via the speed reduction mechanism 52 and the differential mechanism 53 by reducing the driving torque of the motor 51 to a rotation speed suitable for traveling of the vehicle. Thus, the drive unit 50 can cause the vehicle 1 to run by rotating the rear wheel 43 via the rear axle 44.

  The driving power supply unit 60 is a so-called inverter, converts DC power supplied from the battery pack 70 into AC power, supplies the AC power to the motor 51, and controls the rotation speed of the motor 51 according to an accelerator operation on the vehicle 1. .

  Battery pack 70 is a secondary battery that supplies electric power to motor 51 as an energy source for running vehicle 1. The battery pack 70 includes a plurality of relatively large-capacity battery modules (not shown) for storing electric power required for the vehicle 1. When a plurality of electric accessories and a power distribution unit that supplies power to them are mounted on vehicle 1 (both are not shown), battery pack 70 can also supply power to the power distribution unit. It may be configured as follows.

  The support device 80 is a connection member for suspending the battery pack 70 on the ladder frame 10 as described in detail below. In the present embodiment, three support devices 80 are provided on each side of the ladder frame 10 in the vehicle width direction Y (a total of six). However, the number of the supporting devices 80 can be appropriately changed according to the weight and the size of the battery pack 70.

  FIG. 2 is a perspective view illustrating a schematic shape of the battery pack 70 mounted on the vehicle 1. In the present embodiment, the battery pack 70 is formed such that the first battery housing portion 71 and the second battery housing portion 72 each having a substantially rectangular parallelepiped shape having the same length in the vehicle front-rear direction X are integrated. Have been.

  Further, the first battery housing portion 71 is set to have a width that fits between the left side rail 11L and the right side rail 11R in the vehicle width direction Y. On the other hand, the length of the second battery housing portion 72 in the vehicle width direction Y is set to be larger than the width of the first battery housing portion 71, and is connected to the first battery housing portion 71 from below in the vehicle height direction Z. .

  That is, the battery pack 70 has a shape in which the cross-sectional shape in a plane perpendicular to the vehicle front-rear direction X is inverted T-shaped. The battery pack 70 is arranged so that the side rail 11 passes through a stepped portion caused by a difference in width between the first battery housing 71 and the second battery housing 72. Thus, the battery pack 70 effectively uses the space between the left side rail 11L and the right side rail 11R and below the side rail 11 to increase the battery capacity.

  Further, the battery pack 70 is provided with a plurality of support device mounting regions 73 for connecting a battery-side bracket 82 described later on the side surface of the second battery housing portion 72 in the vehicle width direction Y.

  FIG. 3 is a perspective view illustrating a configuration and a connection form of a support device 80 that connects the side rail 11 and the battery pack 70. More specifically, FIG. 3 is a perspective view of one support device 80 connected to the left side rail 11L when viewed from diagonally forward left of the vehicle 1.

  Here, the side rail 11 has a shape in which a web 11w forming a plane perpendicular to the vehicle width direction Y and two flanges 11f forming a plane perpendicular to the vehicle height direction Z are continuous. In the web 11w, through holes for fixing bolts for suspending various heavy objects on the vehicle 1 are formed in a lattice shape.

  The support device 80 includes a frame-side bracket 81, a battery-side bracket 82, an elastic connecting portion 83, and a spacer 84.

  The frame-side bracket 81 is a metal member connected to the outer surface of the side rail 11, that is, the web 11w. The battery-side bracket 82 is a metal member fixed to the above-described support device mounting area 73 of the battery pack 70.

  The elastic connecting portion 83 is a connecting member that elastically connects the frame-side bracket 81 and the battery-side bracket 82 vertically in the vehicle height direction Z. The spacer 84 is a metal member that is interposed between the side rail 11 and the frame-side bracket 81 when the connection surfaces of the side rail 11 and the frame-side bracket 81 are separated from each other. Therefore, when the side rail 11 and the frame-side bracket 81 are not separated from each other, the spacer 84 becomes unnecessary.

  As described above, in the vehicle 1 of the present embodiment, the battery pack 70 is suspended on the side rail 11 via the support device 80 including the battery-side bracket 82, the elastic connecting portion 83, the frame-side bracket 81, and the spacer 84. You. For this reason, even when the side rail 11 is subjected to a stress due to torsion or bending as the vehicle 1 travels, the elastic connecting portion 83 may transmit the stress to the battery pack 70 due to the buffer effect. Can be reduced.

  FIG. 4 is an exploded perspective view partially showing the support device 80 according to the present invention. More specifically, FIG. 4 illustrates a connection configuration of the frame-side bracket 81, the elastic connecting portion 83, and the spacer 84 in FIG.

  The frame-side bracket 81 according to the present embodiment includes a bracket rear surface 81a, a bracket bottom surface 81b, and two bracket side surfaces 81c, and are formed so that their surfaces are orthogonal to each other. Further, the frame-side bracket 81 includes a plurality of laminated fastening bolts 81d for integrally fastening a plurality of plate-like members constituting the frame-side bracket 81, as described later.

  The bracket rear surface 81a forms a plane perpendicular to the vehicle width direction Y, and is connected to the outer side surface of the side rail 11 via a spacer 84 by a plurality of bolts (not shown). The bracket bottom surface 81b forms a plane that is perpendicular to the vehicle height direction Z while being continuous with the bracket back surface 81a, and supports the elastic connecting portion 83 using an opening formed substantially at the center. The two bracket side surfaces 81c are configured to be continuous with both the bracket back surface 81a and the bracket bottom surface 81b while being orthogonal to both.

  More specifically, the elastic connecting portion 83 includes a seat member 83a, an insertion member 83b, an elastic member 83c, and a plurality of fastening members 83d. The seat member 83a is placed on the bracket bottom surface 81b of the frame-side bracket 81, and is fixed to the bracket bottom surface 81b by a plurality of fastening members 83d. The insertion member 83b partially protrudes upward in the vehicle height direction Z from the seat surface member 83a, and penetrates through an opening formed in the seat surface member 83a and an opening in the bracket bottom surface 81b, so that the insertion member 83b extends in the vehicle height direction Z. Is fixed to the battery-side bracket 82 located below. The elastic member 83c is a so-called rubber bush that is interposed between the seat member 83a and the insertion member 83b and absorbs a stress caused by a relative displacement between the two.

  Here, the frame-side bracket 81 has a bracket rear surface 81 a connected to the side rail 11 in the vehicle width direction Y, and a bracket bottom surface 81 b having a weight of the battery pack 70 below the vehicle height direction Z via the elastic connecting portion 83. Support. Therefore, the two bracket side surfaces 81c prevent the relative angle between the bracket back surface 81a and the bracket bottom surface 81b from expanding.

  FIG. 5 is an exploded perspective view of the frame side bracket 81. The frame-side bracket 81 is composed of a first sheet metal member 90, a second sheet metal member 91, and a third sheet metal member 92. These plate members are stacked and integrated by a plurality of stacked fastening bolts 81d (see FIG. 4). It is fixed and formed. Here, the first sheet metal member 90, the second sheet metal member 91, and the third sheet metal member 92 are obtained by cutting out a common sheet metal according to the respective shapes and then cutting the above-described bracket back surface 81a, bracket bottom surface 81b, and 2 It is bent and formed so as to form one bracket side surface 81c.

  The first sheet metal member 90 includes a first sheet metal back face 90a that is a part of the bracket back face 81a, a first sheet metal bottom face 90b that is a part of the bracket bottom face 81b while being continuous from the first sheet metal back face 90a, and a first sheet metal back face 90a. And a first sheet metal side surface 90c which is a part of the bracket side surface 81c while continuing from the first side. The first sheet metal back surface 90a has substantially the same shape as the bracket back surface 81a when viewed in plan. The first sheet metal bottom surface 90b has substantially the same shape as the seat surface member 83a of the elastic connection portion 83 when viewed in plan. Although the first sheet metal side surface 90c is a substantially right triangle when viewed in plan, the width in the vehicle width direction Y is set shorter than the bracket side surface 81c.

  The second sheet metal member 91 includes a second sheet metal back surface 91a that is a part of the bracket back surface 81a, a second sheet metal side surface 91c that is a part of the bracket side surface 81c while being continuous from the second sheet metal back surface 91a, and a second sheet metal side surface 91c. And a second sheet metal bottom surface 91b which is a part of the bracket bottom surface 81b while continuing from the bottom. The second sheet metal back surface 91a has substantially the same shape as the bracket back surface 81a when viewed in plan. The second sheet metal bottom surface 91b has substantially the same shape as the seat member 83a of the elastic connecting portion 83 when viewed in a plan view, but separates respective portions continuous with the two second sheet metal side surfaces 91c. Thus, the gap G is formed between the two. The second sheet metal side surface 91c has substantially the same shape as the bracket side surface 81c in plan view. Since the gap G is formed in the second sheet metal bottom surface 91b, the assemblability when the first sheet metal member 90, the second sheet metal member 91, and the third sheet metal member 92 are stacked is improved.

  The third sheet metal member 92 includes a third sheet metal bottom surface 92b which is a part of the bracket bottom surface 81b, and a third sheet metal side surface 92c which is a part of the bracket side surface 81c while being continuous from the third sheet metal bottom surface 92b. The third sheet metal bottom surface 92b has substantially the same shape as the seat surface member 83a of the elastic connecting portion 83 when viewed in plan. The third sheet metal side surface 92c is a substantially right triangle when viewed in plan, but the height in the vehicle height direction Z is set lower than the bracket side surface 81c.

  FIG. 6 is a side view schematically illustrating the configuration of the support device 80 as viewed from the vehicle front-back direction X. More specifically, FIG. 6 transparently shows the configuration of the frame-side bracket 81 when the support device 80 is viewed from the front in the vehicle front-rear direction X.

  In the frame side bracket 81, the number of plate-shaped members to be laminated differs from part to part on the bracket side surface 81c as shown as a first laminated region 93, a second laminated region 94, and a third laminated region 95 in FIG. .

  More specifically, in the first stacked region 93, a first sheet metal member 90, a second sheet metal member 91, and a third sheet metal member 92 are stacked (a region illustrated as a region I in FIG. 6). In the second stacked region 94, either the first sheet metal member 90 or the third sheet metal member 92 and the first sheet metal member 90 are stacked (a region illustrated as a region II in FIG. 6). The third stacked region 95 is composed of only the second sheet metal member 91 (a region illustrated as a region III in FIG. 6).

  Here, as described above, the connection directions of the frame-side bracket 81 with respect to the side rail 11 and the elastic connection portion 83 are orthogonal to each other. At this time, in the region including the corner C formed by the boundary between the bracket side surface 81c and the bracket back surface 81a and the boundary between the bracket side surface 81c and the bracket bottom surface 81b, the side rail 11 and the battery pack 70 The stress due to the relative displacement is concentrated.

  For this reason, the frame side bracket 81 strengthens the rigidity by setting the first laminated region 93 in which the number of laminated plate-like members is the largest in the region including the corner portion C in the bracket side surface 81c, thereby concentrating. Improves robustness against stress.

  In the bracket side surface 81c, in a region where the stress is relatively relaxed as compared with the first stacked region 93, the second stacked region 94 or the third stacked region 95 is set according to the magnitude of the stress. In addition, weight and material cost can be reduced by preventing the plate members from being excessively stacked. More specifically, the number of stacked plate-like members decreases in the vehicle width direction Y in the direction away from the side rail 11 in the vehicle width direction Y, and in the vehicle height direction Z, The number of laminated plate members decreases in the direction away from the elastic connecting portion 83.

  Here, when the battery pack 70 is displaced in the vehicle width direction Y with respect to the side rails 11, the frame-side bracket 81 receives stress in the roll direction. More specifically, in FIG. 6, for example, when the battery pack 70 is to be displaced rightward in the vehicle width direction Y, the battery-side bracket 82 and the elastic connecting portion 83 connected to the battery pack 70 are also displaced rightward. Then, a stress is generated on the bracket rear surface 81a in a direction in which the side of the side rail 11 goes downward from the side of the side rail 11, with a position P corresponding to the height of the bottom surface of the side rail 11 as a fulcrum. For this reason, stress concentrates on the bracket rear surface 81 a at a position P corresponding to the height of the bottom surface of the side rail 11.

  Therefore, as shown by a point H in FIG. 6, the bracket side surface 81c according to the present embodiment is configured such that the first stacked region 93 in which the number of stacked plate-like members is the largest is formed by the side rail 11 in the vehicle height direction Z. It is configured to extend to a position higher than the bottom surface. Accordingly, the frame-side bracket 81 improves the robustness against the above-described stress in the roll direction in the first laminated region 93 having the highest rigidity in the bracket side surface 81c.

  As described above, in the support device 80 according to the present invention, the frame-side bracket 81 connected to the outer surface of the side rail 11 and the battery-side bracket 82 connected to the battery pack 70 are connected by the elastic connection portion 83. Thereby, the battery pack 70 is elastically supported on the side rail 11. The frame-side bracket 81 is configured by laminating a first sheet metal member 90, a second sheet metal member 91, and a third sheet metal member 92 formed by bending a plate member. For this reason, the support device 80 according to the present invention can respond to various rigidity requirements associated with the weight and connection direction of the battery pack 70 by the number of plate-like members stacked on the frame-side bracket 81. In this case, the first sheet metal member 90, the second sheet metal member 91, and the third sheet metal member 92 can all be formed from a common sheet metal. Therefore, according to the support device 80 of the present invention, it is possible to reduce the manufacturing cost while meeting various rigidity requirements.

  The frame-side bracket 81 is not reinforced when the strength of a part of the bracket back surface 81a, the bracket bottom surface 81b, or the bracket side surface 81c is insufficient due to, for example, a change in the weight of the battery pack 70 or a change in connection specifications. A new sheet metal member can be added and laminated on a necessary portion. In this case, the frame-side bracket 81 can use the existing first sheet metal member 90, second sheet metal member 91, and third sheet metal member 92 as they are, and needs to be redesigned as a whole according to new specifications. Specifications can be extended at low cost.

  In particular, the range in which the battery pack 70 is connected to the side rail 11 via the plurality of support devices 80 increases according to the length in the vehicle front-rear direction X. For this reason, in the battery pack 70, the influence of the displacement due to the twisting or bending of the side rail 11 is amplified between the front and the rear in the vehicle front-rear direction X according to the length. For this reason, the number of stacked plate members of each of the plurality of support devices 80 connected to the battery pack 70 may be adjusted depending on the installation position in the vehicle front-rear direction X.

  In addition, the frame-side bracket 81 has a different number of plate-like members stacked on the bracket side surface 81c for each portion, and has rigidity corresponding to the number of stacked members. Therefore, the rigidity can be enhanced in a portion where stress is concentrated. In particular, the bracket side surface 81c can reinforce the region where stress is concentrated most by maximizing the number of laminated plate members in the region including the corner C at the intersection of the bracket back surface 81a and the bracket bottom surface 81b. it can.

  On the other hand, the frame side bracket 81 can reduce the number of stacked layers in the portion where the stress is relatively relaxed on the bracket side surface 81c, and can achieve weighing. More specifically, the number of stacked plate-like members in the direction away from the side rail 11 is larger than the connection surface between the side rail 11 and the frame-side bracket 81, which are relatively easily subjected to stress. By reducing the weight, it is possible to efficiently reduce the weight according to the relaxation of the stress. In addition, the number of stacked plate-shaped members on the bracket side surface 81c decreases in a direction away from the elastic connection portion 83 with respect to the connection surface between the elastic connection portion 83 and the frame-side bracket 81, which are relatively easily subjected to stress. As a result, efficient weight reduction according to the relaxation of the stress can be achieved.

  Further, regardless of the presence or absence of the spacer 84, the bracket side surface 81c is such that the first rigid region 93 having the highest rigidity is higher than the height of the bottom surface of the side rail 11 at the connection portion between the side rail 11 and the frame side bracket 81. It extends to a position higher than the vehicle height direction Z. Thereby, the bracket side surface 81c can have rigidity against the stress in the roll direction that the frame side bracket 81 receives.

  In addition, since the support device 80 according to the present invention connects the side rail 11 and the battery pack 70 on both sides in the vehicle width direction Y, the support device 80 is provided between the left side rail 11L and the right side rail 11R, and A continuous space consisting of a region below the side rail 11 can be secured, and a large battery pack 70 can be arranged in the vehicle 1.

  In addition, the support device 80 according to the present invention includes a connection portion between the side rail 11 and the frame-side bracket 81, a connection portion between the frame-side bracket 81 and the elastic connection portion 83, and a connection in which a plurality of plate members are integrally laminated. All parts are fastened by bolts, not by welding. Here, if the connecting portions are connected by welding, the opposing surfaces are connected to each other, and therefore, depending on conditions, there is a possibility that the welding surface becomes vulnerable to stress. On the other hand, in the support device 80 according to the present invention, since each connecting portion is fixed by the bolt straddling both members to be connected, robustness against stress can be enhanced.

  The description of the embodiment is finished above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, the specific shapes of the first sheet metal member 90, the second sheet metal member 91, and the third sheet metal member 92 have been exemplified. It can be changed according to various conditions such as a connection form between the battery pack 70 and the battery pack 70.

DESCRIPTION OF SYMBOLS 1 Vehicle 10 Ladder frame 11 Side rail 11w Web 70 Battery pack 80 Support device 81 Frame side bracket 81a Bracket back side 81b Bracket bottom surface 81c Bracket side surface 82 Battery side bracket 83 Elastic connecting part 84 Spacer 90 First sheet metal member 91 Second sheet metal member 92 Third sheet metal member

Claims (6)

A vehicle battery pack support device for suspending a battery pack on a side rail that forms a ladder frame of a vehicle,
A frame side bracket connected to an outer surface of the side rail,
An elastic connecting portion for elastically connecting the frame-side bracket and the battery pack,
The frame side bracket includes a bracket rear surface connected to the outer side surface, a bracket bottom surface which supports the elastic connecting portion while being continuous with the bracket rear surface, and perpendicular to both the bracket rear surface and the bracket bottom surface. A battery pack supporting device for a vehicle, comprising a plurality of bent plate-like members stacked so as to form a continuous bracket side surface.   The vehicle battery pack supporting device according to claim 1, wherein the bracket side surface has a different number of stacked plate-shaped members for each portion.   3. The vehicle battery pack according to claim 2, wherein the number of stacked plate members is the largest in a region including a corner formed by a boundary between the bracket side surface and the bracket rear surface and a boundary with the bracket bottom surface. 4. Support device.   4. The vehicle battery pack supporting device according to claim 3, wherein the number of stacked plate members decreases in a direction in which the side surfaces of the bracket are separated from the side rails. 5.   4. The battery pack supporting device for a vehicle according to claim 3, wherein the number of stacked plate members decreases in a direction in which the bracket side surface is separated from the elastic connection portion. 5.   The vehicle battery pack supporting device according to any one of claims 3 to 5, wherein the side surface of the bracket extends to a position higher than a bottom surface of the side rail in a vehicle height direction.

Images