JP2012091726A - Battery box mounting structure for vehicles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery box mounting device for vehicles which, while making a battery box not drop out easily due to collision of vehicles and the like, satisfies both of durability enhancement and reduction of weight and cost of a battery box supporting device.SOLUTION: The battery box mounting device for vehicles has a bending section 112 where horizontal cross section to which an aperture is located at outside of the vehicle width direction faces at U-shape on a web portion 41 of a side frame 4, a plurality of stays 11 arranged in a longitudinal direction of the vehicle at intervals, a pedestal section 14 fixed to lower part of a plurality of stays 11, a projection 35 intruding into the aperture 111 at a flange section 32 mounted on the pedestal section 14 to form storage aperture frame of a battery storage section, and a battery box 3 in which an engaging projection 351 engaging to an engagement hole 115 formed in the bending section 112 to be regulated to move outside of the vehicle width direction is arranged on the projection 35. The battery box 3 is fixed between the stay 11 and the pedestal section 14 with a fixing band.

Description

  The present invention relates to a battery box mounting structure for a vehicle in which a battery is housed.

In an electrically driven vehicle such as an electric vehicle, a mounting structure in which a battery box containing a large-capacity battery is attached to one side of a side frame extending in the longitudinal direction of the vehicle via a bracket device. Is commonly used.
6 and 8 are plan views of an attachment structure in which the battery box 01 is attached to the web surface 012 of the side frame 010 extending in the vehicle front-rear direction via a bracket device in an electrically driven vehicle. (D) of the battery box 01 indicates normal driving, and (E) indicates a collision.

  In FIG. 7, reference numeral 01 denotes a battery box 01 in which a battery is housed. The battery box 01 has a substantially L-shape that is fastened to two places with bolts (not shown) at intervals in the longitudinal direction of the vehicle. The support bracket 03 and a fixing band 08 for fixing the battery box 01 mounted on the horizontal portion of the substantially L-shaped support bracket 03 extending in the vehicle width direction outward direction to the support bracket 03. .

FIG. 7D shows the general running state of the vehicle. At the time of the vehicle collision of FIG. 7E, the inertial force of the battery box 01 when the impact force F due to the collision acts on the side frame 010 is the battery box 01. It is conceivable that a large load acts as an inertial reaction force on the fixing band 08 fastened to the bracket 03, and the battery box 01 falls off the bracket 03 due to the fracture of the fixing band 08.
As a prior art of the countermeasure, Japanese Patent Application Laid-Open No. 2007-230459 (Patent Document 1) is disclosed.

As shown in FIG. 8 in Patent Document 1, the attachment device 02 is fastened to a web surface 012 of the side frame 010 in a vehicle front-rear direction and is fastened by bolts (not shown) at two locations. A letter-shaped support bracket 03, a support base 04 on which the battery box 01 is placed on a horizontal portion extending outward in the vehicle width direction of the substantially L-shaped support bracket 03, and a support base 04 placed on the support base 04 And a fixing band 08 for fixing the battery box 01 to the support bracket 03.
The battery box 01 placed on the support base 04 is supported by a fixing band 08 that bridges the upper end portion of the base portion of the substantially L-shaped support bracket 03 and the tip portion of the substantially L-shaped placement portion. It is tightened to 03.
On the other hand, stopper members 07 (illustrated by solid lines for easy understanding of the figure) are fixed to a plurality of locations at the bottom of the battery box 01 (illustrated by two-dot chain lines for easy understanding of the figure), and the support base 04 is provided. Discloses a technology for regulating the movement of the battery box 01 in the vehicle front-rear direction by cooperation of the front end edge 042 and the rear end edge 043 and the stopper member 07.
With such a structure, the stopper member 07 fixed to the battery box 01 is engaged with the support base 04 so that the heavy battery box 01 moves in the vehicle front-rear direction due to an impact force caused by a vehicle collision or the like. , Movement can be regulated.

Japanese Patent Application Laid-Open No. 2007-230459

  However, the center of gravity of the heavy battery box 01 is located away from the web surface 012 of the side frame 010 in the vehicle outward direction, and the inertial force of the battery box 01 due to a vehicle collision or the like is large. Since a large bending force in the vehicle front-rear direction acts on the attachment portion of the side frame 010 with the web surface 012, a reinforcing attachment bracket 031 is interposed between the web surface 012 and the support bracket 03, The stopper member 07 is fixed to a plurality of locations at the bottom of the battery box 01, which increases the number of components and increases the weight and cost.

  Further, since the two substantially L-shaped support brackets 03 are deformed in the vehicle front-rear direction due to the inertial force of the battery box 01 in the vehicle front-rear direction, the band plate-like fixing band 08 includes the entire width of the band plate. A non-uniform tensile force acts on the fixing band 08, and the fixing band 08 cannot maintain a predetermined strength.

  Therefore, the present invention has been made in view of the above problems, and prevents the battery box from easily falling off due to a vehicle collision or the like, and achieves both improvement in durability of the battery box support device and reduction in weight and cost. An object of the present invention is to provide a battery box mounting structure for a vehicle.

  The present invention achieves such an object. In a battery box mounting structure for a vehicle in which a battery box in which a battery is housed is attached to a side frame extending in the vehicle longitudinal direction, the battery box is mounted on a web portion of the side frame. A plurality of support members extending in the vertical direction, having an opening located on the outer side in the vehicle width direction, having opposed bent portions with a U-shaped horizontal cross section, and being spaced apart in the vehicle longitudinal direction A first engaging portion formed in the bent portion of the support member, a pedestal portion having one side fixed to a lower portion of the plurality of support members and the other side extending outward in the vehicle width direction, A flange portion mounted on the pedestal portion and extending outwardly on the outer peripheral portion of the battery box is provided with a protruding portion that fits into the U-shaped opening and is opposed to the first engagement portion And engaged with the first engaging portion A battery box having a second engaging portion disposed on the protrusion, and bridging the upper portion of the support member and the other side of the pedestal portion, and connecting the battery box between the support member and the pedestal portion. A tightening member for tightening is provided, and the battery box restricts the movement of the battery box to the outside in the event of a vehicle collision by the engagement of the first engagement portion and the second engagement portion.

  In such an invention, when the vehicle collides, the protrusion of the battery box restricts the movement in the vehicle front-rear direction by the bent portion of the support member, but the center of gravity of the battery box is outside the protrusion in the vehicle width direction. However, the battery box moves outward by the engagement of the first engagement portion and the second engagement portion in the vehicle width direction outward direction. To regulate. The regulation reduces the moment load of the battery box that acts on the tightening member, improves the battery box holding force of the vehicle body, and reduces the tensile force acting on the tightening member, eliminating unnecessary strength reinforcement of the tightening member. , Have the effect of reducing weight and cost.

  Preferably, in the invention of the present application, the first engaging portion and the second engaging portion are disposed at the rearmost portion of the plurality of support members, and the projecting portion is caused by an inertial force of the battery box when the vehicle collides forward. It is better to regulate the moment of rotation outward in the vehicle width direction.

  With this configuration, when the vehicle collides forward, the moment that rotates outward in the vehicle width direction due to the inertia of the battery box is regulated at the rear of the battery box in the vehicle longitudinal direction. This improves the battery box holding force of the vehicle body and reduces the tensile force acting on the fastening member.

  Preferably, in the present invention, the first engaging portion and the second engaging portion are disposed in the foremost portion of the plurality of support members, and the protrusion portion is caused by an inertial force of the battery box when the vehicle collides backward. It is better to regulate the moment of rotation outward in the vehicle width direction.

  With this configuration, the vehicle box holding force of the vehicle body is improved by regulating the moment of rotation outward in the vehicle width direction due to the inertial force of the battery box when the vehicle is bumped or when the vehicle suddenly stops in reverse. The tensile force acting on the tightening member is reduced.

  Preferably, in the present invention, the first engagement portion is a long hole having a first plane portion in the vertical direction formed in the flange portion in the vehicle front-rear direction, and the second engagement portion is the long hole. And has a second plane portion facing the first plane portion, and the first plane portion and the second plane portion are brought into contact with each other to engage outward in the vehicle width direction. Features.

  By adopting such a configuration, when engaging, the first flat surface portion of the first engaging portion and the second flat surface portion of the second engaging portion are brought into surface contact engagement, whereby the contact portion Is reduced, and deformation of the engaging portion is prevented.

  In the present invention, preferably, the connecting portion between the protrusion and the second engaging portion is formed into a smoothly changed shape.

  By adopting such a configuration, since the connecting portion is smoothly changed, even if the first engaging portion and the second engaging portion are engaged and a tensile force acts on the connecting portion, the cross-sectional rigidity is increased. The change becomes smooth, concentration of generated stress is prevented, and the strength of the part can be improved.

  According to the present invention, the movement of the battery box in the vehicle front-rear direction is restricted by the protrusion of the battery box and the bent portion of the support member, and the moment rotating around the protrusion is the first engagement portion. By restricting the battery box from moving outward by engagement with the second engagement portion, the moment load of the battery box on the fastening member is reduced, and the battery box holding force of the vehicle body is improved. At the same time, by reducing the tensile force acting on the tightening member, unnecessary strength reinforcement of the tightening member is eliminated, and the weight and cost can be reduced.

1 is a perspective view of a mounting structure in which a battery box according to an embodiment of the present invention is mounted on a side frame of a vehicle. The schematic structure figure of the battery box mounting device concerning the embodiment of the present invention is shown. The X arrow line view of FIG. 1 is shown. FIG. 3 is a detailed view of a Y portion of FIG. 3, (A) shows a normal vehicle mounted state, and (B) shows a state diagram at the time of a vehicle collision. (A) concerning the embodiment of the present invention is an enlarged perspective view of the upper end portion of the stay A, (B) is an enlarged view of an engaging protrusion engaging with an engaging hole of the stay A, and (C) is a detail of (B). A structural diagram is shown. An external view of the battery box installation situation is shown. In the battery box attachment situation diagram of the prior art, (D) shows a normal running, and (E) shows a frontal collision. 1 is a schematic structural diagram of a conventional battery box mounting device.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

(First embodiment)
A structure of a battery box and a battery box mounting device for mounting the battery box to a truck chassis frame according to the present invention will be described.
FIG. 1 is a perspective view of a battery box mounting structure according to an embodiment of the present invention.
Reference numeral 1 denotes a battery box mounting device (hereinafter referred to as a battery bracket) fixed to a web portion 41 of a side frame 4 of a vehicle by a bolt 116 (see FIG. 2) as a fastening member.
As shown in FIGS. 2 and 3, the battery bracket 1 is provided with an A stay 11, B stays 12 and C, which are supporting members, spaced from the vehicle rear side in the web portion 41 of the vehicle side frame 4 in the front-rear direction. The stays 13 are mounted in this order.
Each stay 11, 12 and 13 has a U-shaped horizontal cross section, and each of the openings 111, 121 and 131 are located on the outer side in the vehicle width direction and are bent portions 112, 122 arranged opposite to each other in the front-rear direction. The bottom portions 113, 123, and 133 having U-shaped cross-sections connecting the first and second portions 132 and 132 are attached to the web portion 41 of the side frame 4 by attachment bolts 116.

  A pedestal portion 14 on which the battery box 3 is placed is disposed at a middle portion in the vertical direction of the stays 11, 12, and 13. A mounting portion 146 (FIG. 4 (A)) extending inward in the vehicle width direction from one stepped web portions 143, 144 and 145 (see FIG. 2) which is the side of the pedestal portion 14 on the side frame 4 side, Along with the bottoms 113, 123 and 133 of the stays 11, 12 and 13, they are fastened together with the mounting bolts 116 to the web 41 of the side frame 4.

  In the case of the present embodiment, since the battery box 3 containing a heavy battery is mounted, if the stays 11, 12 and 13 and the pedestal portion 14 are welded and joined, the rigidity of the battery bracket 1 becomes too high, and the side When the frame 4 is twisted, a high stress is likely to be generated at the welded end portion, so that the structure of the battery bracket 1 is made flexible by using a bolt connection to suppress the partial generation of the high stress. In addition, durability is improved.

In addition, a holding member 16 (see FIG. 2) is disposed at the lower end of each stay 11, 12 and 13 in parallel with the side frame 4. When the battery bracket 1 is attached to the vehicle body, the holding member 16 holds the shape of the battery bracket 1 to improve the workability of attaching the battery bracket 1 to the side frame 4, and the battery bracket 1 is deformed when the side frame 4 is twisted. Has the effect of suppressing the above.
Further, a cover member 17 (see FIG. 1 or 2) that protects a storage portion that stores a cooling device, which will be described later, is attached to the other side that is an outer side in the vehicle width direction of the pedestal portion 14 by a fastening member. The cover member 17 also cooperates with the holding member 16 to have an effect of suppressing deformation of the battery bracket 1 when the side frame 4 is twisted.

  As shown in FIG. 1, a cooling device for cooling heat generated by power charging / discharging of a battery (not shown) in the battery box 3 is disposed below the pedestal portion 14, and 71 replenishes the cooling medium. A replenisher injection part 72 is a part of the piping.

  As shown in FIG. 5C (showing the rear portion of the battery box from the vehicle center side), the battery box 3 placed on the pedestal portion 14 extends outwardly from the recess 313 in which the battery is accommodated and the opening thereof. A lower box 31 having a lower flange portion 311, an opening having the same shape facing the opening of the lower box 31, and an upper flange portion 331 having the same shape contacting the lower flange portion 311. The upper box 33 is a lid member of the lower box 31 with a slight recess 333 in the upward direction.

As shown in FIGS. 3 and 5C, the flanges 311 and 331 of the lower box 31 and the upper box 33 facing the openings 111, 121 and 131 of the stays 11, 12 and 13, respectively. A projection 35, B projection 36, and C projection 37 fitted in the respective openings 111, 121 and 131. The protrusions 35, 36, and 37 are in a state in which movement in the vehicle front-rear direction is restricted by the bent portions 112, 122, and 132 of the stays.
In addition, each protrusion part 35,36,37 is integrally formed with the lower side flange part 311 and the upper side flange part 331, respectively.
(Hereinafter, since the structure of the protrusions is complicated, each protrusion is a general term including a portion protruding from both the flange portions of the lower flange portion 311 and the upper flange portion 331.)

  As shown in FIG. 2, the battery box 3 placed on the pedestal portion 14 is fastened between the stays 11, 12 and 13 and the pedestal portion 14 with an A fixing band 5 and a B fixing band 6. ing. The A fixing band 5 has one end engaged with the upper part of the A stay 11, the middle part is a band-like tightening member, and a bolt 117 fixed to the other end is formed on the other side 142 side of the base part 14. The nut is inserted into the fastening hole and fastened to the pedestal portion 14 with the nut 118. On the other hand, the B fixing band 6 is engaged with the upper portion of the C stay 13, the intermediate portion is a band-like tightening member, and the bolt 117 fixed to the other is formed on the other side 142 side of the base portion 14. The nut is inserted into the fastening hole and fastened to the pedestal portion 14 with the nut 118.

4 is an enlarged view of the Y portion of FIG. 3. As shown in FIG. 4A, at the front end in the vehicle front-rear direction of the A protrusion 35 fitted in the opening 111 of the A stay 11, An engagement protrusion 351, which is a second engagement part protruding in a rectangular shape toward the flange 112 on the front side of the stay 11, is formed integrally with the A protrusion 35.
On the other hand, FIG. 4B shows that when the vehicle collides forward, the engagement protrusion 351 of the A protrusion 35 is inserted into the engagement hole 115 of the flange 112 as the battery box 3 moves in the vehicle front direction. The engagement protrusion 351 and the engagement hole 115 are engaged.

As shown in FIG. 5 (A), the front flange 112 of the A stay 11 facing the engagement protrusion 351 has an ellipse having a linear portion in the vertical direction at a position facing the engagement protrusion 351. An engagement hole 115 that is a first engaging portion having a shape is formed.
On the other hand, as shown in FIG. 5B, the engaging protrusion 351 is connected to the A protrusion 35 in the drawing with the upper side 353 being connected to the upper edge 354 of the A protrusion 35 in a substantially straight line. The lower side 355 of the projecting portion 35 is substantially perpendicular to the front end edge 352 of the A projecting portion 35, and the connecting portion Z1 is formed in a semicircular shape (smooth change in cross-sectional rigidity).
Further, the connecting portions Z2 and Z3 between the protruding portion 35 and the flange portion 311 (331) are also formed in a semicircular smooth shape.
This is because when the engagement protrusion 351 is engaged with the engagement hole 115, a tensile stress is generated in the direction of the arrow M at the connection portion Z1 of the engagement protrusion 351 when an outward moment is generated in the battery box 3. . This is because by making the tensile stress semicircular, the change in rigidity of the Z1 portion is moderated and shared by the entire Z1 portion to avoid stress concentration. (Stress reduction)
The Z2 and Z3 portions are also formed in a semicircular shape for the purpose of obtaining the same effect.

  With the above-described structure, when the vehicle collides forward, the battery box 3 moves forward by the gap between the bent portions 112, 122, and 132 and the protruding portions 35, 36, and 37 by its own inertial force. However, the projections 35, 36 and 37 abut against the bent portions 112, 122 and 132 of the stays 11, 12 and 13, and the forward movement is restricted.

As a result, the center of gravity of the battery box 3 is on the outer side in the vehicle width direction from each of the protrusions 35, 36, and 37, so that a rotational moment M about the C protrusion 37 is generated in the battery box 3 in the vehicle outward direction. The generated moment M is regulated by the engagement between the engagement projection 351 and the engagement hole 115, the load of the moment acting on the fixing band 5 can be reduced, and no special reinforcement is applied to the A fixing band 5. However, when the vehicle collides in advance, it is possible to prevent a problem that the A fixing band 5 is cut and the battery box 3 is dropped.
In addition, since the battery box 3 does not tilt with respect to the battery bracket 1, an equal tensile force acts on the entire band width of the A fixing band 5, so that the A fixing band 5 can maintain its original strength, Since the A fixing band 5 does not need to be specially reinforced, the engaging protrusion 351 is formed integrally with the A protrusion 35, and the engaging hole 115 is simply formed in the bent portion of the A stay 11. There is no increase in the number of parts, and an increase in weight and cost can be suppressed.

  Furthermore, since the shape of the engagement hole 115 is an ellipse having a straight portion in the vertical direction, the surface of the straight portion in the vertical direction (a surface by the plate thickness is formed) and the plate of the engagement protrusion 351 Since the surface of the thickness (the total thickness of the flange portion 311 of the lower box 31 of the battery box 3 and the plate thickness of the flange portion 331 of the upper box 33) comes into contact with the surface, the surface pressure of the portion decreases and the engagement The hole 115 has an effect of preventing the shape deformation.

In the present embodiment, the engagement protrusion 351 and the engagement hole 115 are engaged by the movement of the battery box 3 when the vehicle collides in front of the vehicle. However, when the battery box 3 is mounted on the pedestal portion 14, Alternatively, the engagement protrusion 351 and the engagement hole 115 may be engaged in advance.
However, in the assembly structure in which the engagement protrusion 351 and the engagement hole 115 are engaged in advance, the battery box 3 must be moved to the front side of the vehicle after the battery box 3 is placed on the pedestal portion 14. However, the movement of the heavy battery box 3 requires extra man-hours.
On the other hand, when the battery box 3 of the present embodiment is engaged with the engagement protrusion 351 and the engagement hole 115 by the movement at the time of a vehicle front collision, the battery box 3 can be easily mounted from the lateral direction of the vehicle by a forklift or the like. It was adopted in the embodiment.
Even in this case, since the fixing bands 5 and 6 are fixed to the stays 11, 12, and 13, the engagement is reliably performed.
Therefore, either the case where the engagement protrusion 351 and the engagement hole 115 are engaged by the movement at the time of the vehicle front collision, or the case where the engagement protrusion 351 and the engagement hole 115 are engaged in advance, Even if the method is used, the effects of the present invention can be obtained.

(Second Embodiment)
A case where the reverse of the vehicle is stopped rapidly will be described with reference to FIG.
Dump trucks, garbage trucks, etc. are used in such a way that the platform is moved backward with the platform tilted, the wheels are applied to the stop and the viscous load on the platform is discharged from the platform at once by its inertial force. There will be described a case where there is a rear collision.
The present embodiment is different from the first embodiment in that the first engagement portion and the second engagement portion are arranged in a longitudinal shape with respect to the center of the battery box 3. Only the part and the part of the second engaging part will be described.
At the rear end in the vehicle front-rear direction of the C projection portion 37 fitted in the opening 131 of the C stay 13, a second engagement portion that protrudes in a rectangular shape toward the flange 112 side (vehicle rear side) of the C stay 13. A mating projection 371 is formed integrally with the C projection 37.
On the other hand, the rear flange 134 of the C stay 13 is provided with an engagement hole 135 that is an oval first engagement portion having a flat portion in the vertical direction at a position facing the engagement protrusion 371. ing.

When the vehicle suddenly stops moving backward, the battery box 3 moves backward by the gap between each bent portion 112 and each projection 35 due to its own inertial force, but each projection 35, 36 and 37 The stays 11, 12, and 13 are in contact with the flanges 112, 122, and 132 to be restricted from moving forward.
On the other hand, with the movement of the battery box 3, the engagement protrusion 371 of the C protrusion 37 is fitted into the engagement hole 135 of the rear flange 132.
As a result, the same effect as that of the first embodiment can be obtained.

  When a heavy apparatus is mounted on a side frame of a vehicle, the present invention can be applied to a mounting apparatus that reduces weight and cost.

1 Battery bracket (mounting device)
3 Battery box 4 Side frame 5 Fixing band A (tightening member)
6 Fixing band B (tightening member)
7 Cooling device 11 A stay 12 B stay 13 C stay 14 Base 35 A protrusion 37 C protrusion 111 Opening 112, 132 Flange 115 Engagement hole (first engagement part)
351 engaging protrusion (second engaging portion)

Claims (5)

In the battery box mounting structure of the vehicle, in which the battery box containing the battery is attached to the side frame extending in the vehicle longitudinal direction,
It is attached to the web portion of the side frame, extends in the vertical direction, has an opening located on the outer side in the vehicle width direction, has a bent portion with a U-shaped horizontal cross section, and has an interval in the vehicle longitudinal direction. A plurality of support members arranged as
A first engagement portion formed in the bent portion of the support member;
A pedestal portion with one side fixed to the lower part of the plurality of support members and the other side extending outward in the vehicle width direction;
On the flange that is placed on the pedestal and extends outward to the outer periphery of the battery box,
Protruding portions that fit into the U-shaped openings are provided, and a second engaging portion that engages with the first engaging portion is disposed on the protruding portion at a position facing the first engaging portion. Battery box
A fastening member that bridges between the upper portion of the support member and the other side of the pedestal portion, and fastens the battery box between the support member and the pedestal portion;
The battery box mounting structure for a vehicle, wherein the battery box restricts the movement of the battery box to the outside in the event of a vehicle collision by the engagement of the first engagement portion and the second engagement portion.   The first engagement portion and the second engagement portion are disposed at the rearmost portions of the plurality of support members, and in the vehicle width direction around the projection portion due to the inertial force of the battery box when the vehicle collides forward. 2. The battery box mounting structure for a vehicle according to claim 1, wherein a moment for rotating outward is restricted.   The first engaging portion and the second engaging portion are arranged at the foremost portion of the plurality of support members, and when the vehicle collides rearward, the vehicle box direction is centered on the protrusion by the inertial force of the battery box. 2. The battery box mounting structure for a vehicle according to claim 1, wherein a moment for rotating outward is restricted.   The first engagement portion is a long hole having a first flat surface portion formed in the flange portion in the vehicle front-rear direction, and the second engagement portion can be fitted into the long hole. And a second planar portion facing the first planar portion, wherein the first planar portion and the second planar portion are in contact with each other and engage outward in the vehicle width direction. The battery box mounting structure of the vehicle described.   The battery box mounting structure for a vehicle according to claim 1, wherein a connecting portion between the protrusion and the second engaging portion has a smoothly changed shape.

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