JP2019093885A - Frame structure for vehicle - Google Patents

Abstract

To make compatible both the securement of a drip hole of a cross member, and the suppression of the lowering of rigidity.SOLUTION: A cross member 20 has a closed cross section structure having a substantially-rectangular shape in a side face view, and diameter-expanded parts 22 which are expanded in diameters to a vehicle fore-and-aft vertical direction along the outside of a vehicle width direction are formed at both ends in the vehicle width direction. A weld margin 30 welded to an inclined part 16 of a kickup frame 10 is formed at a terminal end in the vehicle width direction of the diameter-expanded part 22 over the vehicle fore-and-aft vertical direction. In a lower diameter-expanded part 22B connected to a lower weld margin 30D along the inclined part 16 of the kickup frame 10 out of the weld margin, a burring hole 34 is formed at a position being the lowest point in an internal space 32 of the diameter-expanded part 22 which is a front part of a vehicle being a relatively-low position along the inclined part 16.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle frame structure.

  In a vehicle having a frame structure in which a body is placed on a frame that is a frame member, a kickup frame described in Patent Document 1 or the like may be used as a pair of left and right frame members extending in the vehicle longitudinal direction. In the kick-up frame, the frame is bent upward (kick-up) at the passage point of the axle, in order to secure a space for passing the axle under the frame while achieving a low floor of the cabin.

  A cross member is attached to an inclined portion which is an upward slope along the rear of the vehicle among the curved portions of the kickup frame. For example, the cross member is attached to an inclined portion (rear inclined portion) formed to pass the rear wheel axle downward. The cross member extends in the vehicle width direction, is provided between the inclined portions of the pair of kickup frames, and connects the inclined portions.

  The cross member has, for example, a closed cross-sectional structure having a rectangular shape in a side view, and the inside is hollow. Further, both ends in the vehicle width direction of the cross member are expanded in the longitudinal and longitudinal directions (upper and lower, right and left in a side view) in accordance with the dimensions of the kickup frame. At the end of this enlarged diameter portion, a welding margin is formed to be welded to the kickup frame.

Japanese Patent Application Publication No. 2007-055350

  By the way, in the cross member, a reference hole serving as a reference at the time of assembly, a gap due to a tolerance (play) at the time of assembling the members, and the like are formed. While the vehicle travels in a puddle or a shallow river, water (muddy water) intrudes into the cross member from the above holes and gaps. If this water stays inside the cross member, there is a risk of corrosion.

  Therefore, it is conceivable to provide a drainage hole at the lowest point of the internal space of the cross member. For example, when the cross member is welded to the inclined portion of the kickup frame, as shown in FIG. 5, the relative diameter of the lower enlarged diameter portion 104 of the cross member 100 expanded downward along the outer side in the vehicle width direction. The lowest point 106 in the interior space 102 of the cross member 100 is provided in front of the vehicle, which is at a very low position.

  For example, it is conceivable that the lowest point 106 is punched out by pressing to form the drain hole 108. However, the provision of the drainage hole 108 causes another problem that the rigidity around it is reduced. That is, when a load is input to the lower enlarged diameter portion 104, response deformation occurs such that the drainage hole 108 is distorted. That is, the area around the drainage hole 108 is deformed in response to the load input, and the maintenance of the rigidity of the cross member 100 becomes difficult. Then, an object of this invention is to provide the flame | frame structure for vehicles which can make compatible the ensuring of a drainage hole in a cross member, and suppression of a rigid fall.

  The present invention relates to a vehicle frame structure. The structure comprises a kickup frame and a cross member. The kickup frames extend in the vehicle longitudinal direction and are provided in pairs on the left and right. The cross member extends in the vehicle width direction, and connects inclined portions of the pair of kickup frames, which are uphill along the rear of the vehicle. The cross member has a closed cross-sectional structure that is substantially rectangular in a side view, and an enlarged diameter portion that is expanded in the longitudinal direction of the vehicle along the outer side in the vehicle width direction is formed at both ends in the vehicle width direction. A welding margin to be welded to the inclined portion of the kickup frame is formed at the end in the vehicle width direction of the enlarged diameter portion in the longitudinal direction of the vehicle. The lower diameter enlarged portion connected to the lower welding margin along the inclined portion of the kickup frame among welding allowances is the front of the vehicle which becomes relatively low along the inclined portion and the inside of the enlarged diameter portion A burring hole is formed at the lowest point in the space.

  According to the above configuration, the burring hole is provided at the lowest point in the internal space of the enlarged diameter portion. The formation of the hole at the lowest point eliminates the retention of water in the cross member. Further, since the reinforcing flange is formed around the burring hole, deformation of the hole shape at the time of load input is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the flame | frame structure for vehicles which can make compatible the ensuring of the drainage hole in a cross member, and suppression of a rigid fall.

It is a side view which illustrates the overview of a kick up frame. FIG. 6 is an enlarged perspective view illustrating the vicinity of the inclined portion of the kickup frame in the vehicle frame structure according to the embodiment; It is AA sectional drawing of FIG. FIG. 5 is a cross-sectional view taken along the line B-B in FIGS. 2 and 3. It is sectional drawing explaining the drainage hole provided in the cross member based on a prior art.

  A vehicle frame structure according to the present embodiment will be described with reference to FIGS. 1 to 4. In the following, for convenience of illustration, only the right side or the left side of the vehicle may be illustrated. However, because of the symmetry of the vehicle structure, the side not illustrated also has the same structure.

  Further, in FIGS. 1 to 4, the longitudinal direction of the vehicle is indicated by an axis represented by symbol FR, and the width direction of the vehicle (hereinafter appropriately referred to simply as the width direction) is indicated by an axis represented by symbol RW. Is indicated by the axis represented by the symbol UP. The symbol FR is an abbreviation of Front, and the front-rear direction axis FR makes the forward direction of the vehicle a positive direction. The symbol RW is an abbreviation of Right Width, and the width direction axis RW has the right width direction as a positive direction. In addition, the height axis UP has an upward direction as a positive direction.

  As shown in FIG. 1, the FR axis, the RW axis, and the UP axis are orthogonal to one another. Hereinafter, when demonstrating the vehicle side part structure which concerns on this embodiment, it demonstrates suitably based on these 3 axis | shafts. For example, the “front end” refers to the end on the positive side of the FR axis of any member, and the “rear end” refers to the end on the negative side of the FR axis of any member. The “width inside” refers to the inside in the width direction of the vehicle relatively along the RW axis, and the “outside” refers to the outside in the width direction of the vehicle relatively along the RW axis. Furthermore, “upper side” relatively indicates the positive direction side of the UP axis, and “lower side” relatively indicates the negative direction side of the UP axis.

  The vehicle frame structure according to the present embodiment includes a kickup frame 10 and a cross member 20.

  A side view of the kickup frame 10 is illustrated in FIG. The kickup frame 10 is a frame member extending in the longitudinal direction of the vehicle. The kickup frame 10 has a closed cross-sectional structure that is substantially rectangular in a front view, as illustrated in, for example, the cross-sectional view of FIG. 4. For example, the kickup frame 10 is formed by joining divided bodies having a U-shaped cross section divided in the vehicle width direction. The chevron pattern (jagged pattern) in FIG. 4 represents a welded portion.

  Further, in order to pass the axle (not shown) of the front wheel 12 and the axle (not shown) of the rear wheel 14 shown in FIG. 1 under the frame, the passing positions of the front and rear axles of the kickup frame 10 are The frame is curved upward as compared to the front and back. Among the curved portions, an inclined portion 16 having an upward slope toward the rear of the vehicle is provided around the passing position of the rear wheel axle.

  As illustrated in FIG. 2, the inclined portions 16, 16 of the pair of left and right kickup frames 10, 10 are connected by the cross member 20. The cross member 20 is a frame member extending in the vehicle width direction, and is provided between the inclined portions 16 and 16 of the pair of left and right kickup frames 10 and 10.

  The cross member 20 has a closed cross-sectional structure that is substantially rectangular in a side view as illustrated in FIG. 3. For example, the cross member 20 is formed by joining divided bodies having a U-shaped cross section divided in the vertical direction of the vehicle.

  Referring to FIGS. 2 and 3, enlarged diameter portions 22, 22 are provided at both ends of cross member 20 in the vehicle width direction. In the enlarged diameter portion 22, the wall plate members constituting the cross member 20 in the front-rear vertical direction are expanded in the front-rear vertical direction of the vehicle toward the outer side in the vehicle width direction. For example, as the lower wall plate 24 of the cross member 20 moves outward in the vehicle width direction, the lower enlarged diameter portion 22B is formed to expand downward in the vehicle.

  Referring to FIG. 3, of the enlarged diameter portion 22, the upper enlarged diameter portion 22 </ b> A and the lower enlarged diameter portion 22 </ b> B are formed along the shape of the inclined portion 16 of the kickup frame 10 to which they are joined. That is, in the upper enlarged diameter portion 22A and the lower enlarged diameter portion 22B, the front of the vehicle is at a relatively low position, and the rear of the vehicle is at a relatively high position. Therefore, as described later, the water that has entered the cross member 20 travels along the lower enlarged diameter portion 22B and flows outward and forward in the vehicle width direction along the gradient.

  A welding margin 30 (scissor) to be welded to the inclined portion 16 of the kickup frame 10 is formed at the end in the vehicle width direction of the enlarged diameter portion 22. The welding margin 30 is formed at each end of the enlarged diameter portion 22 expanding in the longitudinal direction of the vehicle, and extends in the longitudinal direction of the vehicle in the same manner as the enlarged diameter portion 22.

  For example, a front welding margin 30A and a rear welding margin 30B provided in the longitudinal direction of the vehicle are welded to the widthwise inner side surface 10A of the kickup frame 10. Further, an upper welding margin 30C provided in the vehicle upward direction is formed along the shape of the inclined portion 16. That is, it is formed to be an upward slope along the rear of the vehicle, and is welded from the widthwise inner surface 10A to the upper surface 10B of the kickup frame 10 as illustrated in FIG. 4. A lower welding margin 30D provided in the vehicle downward direction is also formed to have an upward slope along the shape of the inclined portion 16, that is, along the rear of the vehicle. The lower welding allowance 30D is welded to the lower surface 10C of the kickup frame 10.

  Thus, the vehicle width direction end opening of the enlarged diameter portion 22 of the cross member 20 of the closed cross-sectional structure is closed by the kickup frame 10. As described above, water intrudes into the internal space 32 of the closed enlarged diameter portion 22 from the reference hole, the gap, or the like provided in the cross member 20. In order to quickly drain the water from the internal space 32 to the outside, a burring hole 34 is formed in the enlarged diameter portion 22 of the cross member 20 as a water drainage hole.

  The burring hole 34 is provided at the lowest point of the internal space 32. As described above, the lower enlarged diameter portion 22B extends downward toward the outer side in the vehicle width direction. Further, since the lower enlarged diameter portion 22B is formed along the inclined portion 16 of the kickup frame 10, the lower diameter portion 22B has a relatively lower position toward the front of the vehicle. Therefore, the front end of the lower enlarged diameter portion 22B and the outer end in the vehicle width direction become the lowest point. A burring hole 34 is formed at the lowest point as a drainage hole.

  The outer end in the vehicle width direction of the lower enlarged diameter portion 22B is connected to the lower welding margin 30D. In order to prevent the retention of water in the welded portion, the lower enlarged diameter portion 22B may be formed such that the lowest point of the internal space 32 is at a lower position than the lower welding margin 30D.

  As described above, the burring hole 34 according to the present embodiment is provided at the front and lower corner of the enlarged diameter portion 22 of the vehicle. Qualitatively, when a load is input to the substantially rectangular enlarged diameter portion 22, a relatively large load is input to the corner. In the present embodiment, when the water draining hole is provided in such a high load input area, the lowering of the rigidity is suppressed by using the hole as the burring hole 34. In other words, in the present embodiment, since the water draining hole at the joint portion between the cross member 20 and the kickup frame 10 is a high stressed portion, the water draining hole has a burring structure to prevent strength reduction and also drains water. Is secured.

  The burring hole 34 refers to a hole formed by so-called burring, and a flange 36 is provided (raised) around the through hole. That is, by raising the flange 36 at the edge of the hole, the rigidity around the hole is enhanced.

  For example, when a load is input around the burring hole 34, the stress of the flange 36 prevents deformation of the hole shape. As a result, the deformation around the burring hole 34 is suppressed, and it is possible to simultaneously secure the water draining hole in the cross member 20 and suppress the reduction in rigidity.

  10 kick-up frame, 10A inner side surface, 10B upper surface, 10C lower surface, 16 kick-up frame inclined portion, 20 cross member, 22 cross member enlarged diameter portion, 22A upper expanded diameter portion, 22B lower expanded diameter portion, 30 welding margin , 30D lower welding allowance, 32 internal space of the enlarged diameter part, 34 burring hole, 36 burring hole flange.

Claims (1)

A pair of left and right kickup frames extending in the longitudinal direction of the vehicle;
A cross member that extends in the vehicle width direction and connects inclined portions of the pair of kickup frames that are inclined upward along the rear of the vehicle;
A vehicle frame structure comprising:
The cross member has a closed cross-sectional structure that is substantially rectangular in a side view, and an enlarged diameter portion is formed at both ends in the vehicle width direction along the outer side in the vehicle width direction.
A welding margin to be welded to the inclined portion of the kickup frame is formed at the end in the vehicle width direction of the enlarged diameter portion, in the longitudinal direction of the vehicle.
The lower enlarged diameter portion connected to the lower welding margin along the inclined portion of the kickup frame in the welding margin is a front side of the vehicle which is relatively low along the inclined portion, A burring hole is formed at the lowest point in the internal space of the enlarged diameter portion,
Vehicle frame structure.

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