JP6400941B2 - Vehicle cushioning structure - Google Patents

Description

  The present invention relates to a shock absorbing structure for a vehicle including a front underrun protector.

  Large vehicles such as trucks and tractors have a front underrun protector (hereinafter referred to as FUP) located below the front end of the frame. The FUP suppresses the vehicle from entering under the frame of the large vehicle when a vehicle having a vehicle height lower than that of the large vehicle, for example, a passenger vehicle collides with the front end of the large vehicle (see, for example, Patent Document 1).

JP 2010-132059 A

  By the way, the shock absorbing structure of the vehicle including the FUP, the frame, and the bracket for attaching the FUP to the frame can withstand a predetermined load acting on the FUP in order to prevent a vehicle that has collided with the FUP from entering below the frame. Is required. On the other hand, for example, although the resistance to load is increased by increasing the thickness of the bracket, when the thickness of the bracket is increased, the weight of the bracket, and hence the weight of the vehicle, is increased.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicular cushioning structure capable of suppressing an increase in weight when obtaining a desired resistance to a load.

  One aspect of the shock absorbing structure of the vehicle includes a side frame, a front under-run protector, and a bracket for mounting the front under-run protector below the side frame. The bracket extends along the vertical direction to support the front underrun protector, a plate portion fastened to the side frame, and a wide portion having a hollow shape connecting the tube portion and the plate portion. It consists of. The wide portion has a shape in which a width along the front-rear direction, which is the longitudinal direction of the side frame, is larger in front and rear than the upper end of the tubular portion from the tubular portion toward the plate portion. In the tube portion, a fastening portion between the tube portion and the front underrun protector is a tube portion fastening portion. The plate portion has a width equal to or greater than the maximum width of the wide portion in the front-rear direction, and has a plurality of plate portion fastening portions that are fastening portions with the side frames, and in the front-rear direction, The said board part fastening site | part located ahead of a cylinder part fastening part and the said board part fastening part located behind the said cylinder part fastening part are included.

  According to one aspect of the shock absorbing structure of the vehicle, the bracket can have a wide portion that is larger forward and rearward than the upper end of the cylindrical portion, so that a range in which the bracket and the side frame can be fastened is expanded. When the front under-run protector receives a load from the front, the plate portion fastening portion located rearward of the tube portion fastening portion serves as a fulcrum and the plate portion fastening portion located forward serves as an action point in the bracket. . Therefore, a part of the force that acts on the force point that is the fastening portion between the front underrun protector and the bracket acts as a force that presses the fulcrum against the side frame. Therefore, since only the remaining part of the force acting on the force point acts on the bracket as a force that can deform the bracket, it is possible to suppress a change in the shape of the bracket.

  In addition, since the cylindrical portion and the wide portion have a cylindrical shape, the weight of the bracket can be reduced as compared with a configuration in which the bracket is solid. As a result, in the vehicle cushioning structure, it is possible to suppress an increase in weight in order to obtain a desired resistance to a load.

  In another aspect of the vehicle cushioning structure, the wide portion has a width along the vehicle width direction, which is a direction in which the front underrun protector extends, from the cylindrical portion toward the plate portion, rather than the upper end of the cylindrical portion. It has a shape that gradually decreases.

  According to the other aspect of the vehicle cushioning structure, since the width of the wide portion along the vehicle width direction is reduced, the weight of the bracket and thus the weight of the vehicle cushioning structure can be reduced.

  In another aspect of the vehicle cushioning structure, the side frame includes a side surface extending along the longitudinal direction and a lower surface extending along the longitudinal direction. The plate portion is a side plate portion that extends from the upper end of the wide portion along the side surface and is fastened to the side surface. The bracket further includes a lower plate portion extending from the upper end of the wide portion along the lower surface and fastened to the lower surface.

  According to another aspect of the vehicle shock-absorbing structure, the bracket is fastened to the side surface and the lower surface of the side frame. For this reason, as the number of fastening parts of the bracket increases, the resistance to the load received by the front under-run protector increases in the shock absorbing structure of the vehicle.

  In another aspect of the vehicle shock absorber structure, a direction in which the front underrun protector extends is a vehicle width direction, and an end in the vehicle width direction of the front underrun protector is located outside the side frame, The tube portion is located outside the side frame in the vehicle width direction.

  According to the other aspect of the shock absorbing structure of the vehicle, since the cylindrical portion is located outside the side frame, the distance between the end portion of the front under-run protector and the cylindrical portion fastening portion is reduced. Increases resistance to load.

  In another aspect of the vehicle cushioning structure, the cylindrical portion extends along a vehicle body direction, which is a direction in which the front under-run protector extends, from the cylindrical portion main body, and the cylindrical portion fastening portion. And a fastening plate portion that is positioned. In the fastening plate portion, a width along the vertical direction is equal to a width along the vertical direction of the front underrun protector.

  According to another aspect of the vehicle cushioning structure, the width of the fastening plate portion of the cylindrical portion and the width of the front underrun protector are equal to each other in the vertical direction. Therefore, it is difficult for stress to concentrate on the fastening portion between the front underrun protector and the bracket. Therefore, the shape of the front underrun protector and the shape of the bracket are unlikely to change at the fastening portion between the front underrun protector and the bracket.

As for the other aspect of the buffer structure of the said vehicle, in the said cylinder part main body, the cross-sectional shape along a horizontal direction is constant along an up-down direction.
According to the other aspect of the buffer structure of the vehicle, since the cross-sectional shape along the horizontal direction is constant along the vertical direction in the cylindrical portion main body, the vertical widths of the cylindrical portion main body are different from each other in two or more types. When the bracket is formed by press working, the bracket can be formed by the following method. That is, by using forming materials having different vertical widths, or by forming a molded material after molding by shortening the length of the cylinder body in the vertical direction, the bracket can be molded using the same mold. Is possible. Therefore, according to the bracket having the cylindrical body described above, a manufacturing method that can reduce the cost required for manufacturing the bracket can be adopted as the manufacturing method of the bracket.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a vehicle cushioning structure according to an embodiment that embodies a vehicle cushioning structure according to the present invention together with peripheral structures. It is a perspective view which shows the perspective structure which looked at the bracket located in the left side of a vehicle from the right side of the vehicle. It is a perspective view which shows the perspective structure which looked at the bracket located in the left side of a vehicle from the left side of the vehicle. It is a side view which shows the side structure which looked at the bracket located in the left side of a vehicle from the left side of the vehicle. It is an end elevation which shows the end surface structure which looked at the bracket located in the left side of a vehicle from the front of a vehicle. It is a several plate member which comprises a bracket, Comprising: It is a figure which shows the several plate member before welding. It is an operation view for explaining an operation of a buffer structure of a vehicle.

  With reference to FIG. 1 to FIG. 7, one embodiment in which a vehicle buffer structure is embodied will be described. Hereinafter, the configuration of the front end portion of the vehicle including the vehicle buffer structure, the configuration of the bracket, the plate member configuring the bracket, and the operation of the buffer structure of the vehicle will be described in order.

[Configuration of front end of vehicle]
A configuration of the front end portion of the vehicle will be described with reference to FIG.
As shown in FIG. 1, the vehicle is positioned between two side frames 11 extending along the front-rear direction of the vehicle, and the front extending along the vehicle width direction orthogonal to the front-rear direction. A cross member 12 and two brackets 13 fastened to each side frame 11 one by one are provided. The side frame 11 includes a side surface 11a extending along the front-rear direction, which is the longitudinal direction of the side frame 11, a lower surface 11b extending along the front-rear direction, and an upper surface 11c also extending along the front-rear direction. The side surface 11a extends along the vertical direction, and each of the lower surface 11b and the upper surface 11c extends along the vehicle width direction.

  The bracket 13 is fastened to a front underrun protector 14 (hereinafter referred to as FUP 14) extending along the vehicle width direction and the side frame 11, and attaches the FUP 14 below the side frame 11. Of the two end portions of the FUP 14 in the vehicle width direction, the right end portion is located outside the right side frame 11 in the vehicle width direction, and the left end portion is more than the left side frame 11. It is located outside in the vehicle width direction. One side frame 11, one bracket 13, and FUP 14 are an example of a shock absorbing structure of a vehicle.

  A bumper reinforcement 15 is positioned in front of the front cross member 12, the bracket 13, and the FUP 14, and the bumper reinforcement 15 is fastened to each of the two brackets 13. A bumper 16 is located in front of the bumper reinforcement 15, and the bumper 16 is fastened to the bumper reinforcement 15.

[Bracket configuration]
The configuration of the bracket 13 will be described with reference to FIGS. The bracket 13 positioned on the right side of the vehicle with the two side frames 11 interposed therebetween and the bracket 13 positioned on the left side of the vehicle are different from each other in the position with respect to the vertical plane perpendicular to the vehicle width direction. Symmetric. Therefore, in the following, the configuration of the bracket 13 positioned on the left side of the vehicle will be described in detail, and the detailed description of the bracket 13 positioned on the right side of the vehicle will be omitted.

  As shown in FIG. 2, the bracket 13 has a cylindrical portion 21 that supports the FUP 14, a side plate portion 22 that is fastened to the side frame 11, and a wide shape having a hollow shape that connects the cylindrical portion 21 and the side plate portion 22. The unit 23 is provided. In the bracket 13, the side plate 22 is positioned above the tube 21, and the wide portion 23 is positioned between the tube 21 and the side plate 22 in the vertical direction. The wide portion 23 has a hollow shape, and has, for example, an inverted trapezoidal cylindrical shape that expands from the cylindrical portion 21 toward the side plate portion 22.

  The side plate portion 22 extends from the upper end of the wide portion 23 along the side surface 11a of the side frame 11, and the side plate portion 22 has the largest width along the vertical direction at the front end of the side plate portion 22. It is the smallest at the rear end of the face plate portion 22. In the side plate 22, the upper end has a plurality of steps in the vertical direction, and the width in the vertical direction gradually decreases from the front end to the rear end of the side plate 22.

  The side plate part 22 has a plurality of fastening holes penetrating the side plate part 22 in the vehicle width direction, and among the plurality of fastening holes, a plurality of pieces located forward across the center in the front-rear direction of the side plate part 22. These fastening holes are the front fastening holes 22hf, and the plurality of fastening holes located rearward are the rear fastening holes 22hr. The side plate portion 22 is fastened to the side surface 11 a of the side frame 11 by a fastening member that passes through one fastening hole in the side surface 11 a of the side frame 11 and one fastening hole in the side plate portion 22. The side surface plate portion 22 only needs to have at least one front fastening hole 22hf and at least one rear fastening hole 22hr.

  The bracket 13 further includes a lower surface plate portion 24 extending from the upper end of the wide portion 23 along the lower surface 11 b of the side frame 11. In the lower surface plate portion 24, the width in the vehicle width direction is the smallest at the front end of the lower surface plate portion 24, extends from a portion closer to the front end to the rear end than the center in the front-rear direction of the lower surface plate portion 24, and larger than the front end. Is almost constant.

  The lower surface plate portion 24 has a plurality of fastening holes 24 h, and each of the plurality of fastening holes 24 h is located at one of a plurality of portions in the front-rear direction of the lower surface plate portion 24. The lower surface plate portion 24 is fastened to the lower surface 11 b of the side frame 11 by a fastening member that passes through one fastening hole in the lower surface 11 b of the side frame 11 and one fastening hole 24 h in the lower surface plate portion 24. The lower surface plate portion 24 only needs to have at least one fastening hole 24h.

  The bracket 13 is fastened to the side surface 11 a of the side frame 11 by the side face plate portion 22, and fastened to the lower surface 11 b of the side frame 11 by the lower face plate portion 24. Therefore, the fastening part of the bracket 13 increases, and the directions in which the bracket 13 and the side frame 11 are fastened are two directions, the vehicle width direction and the vertical direction. As a result, the resistance against the load received by the FUP 14 is increased in the shock absorbing structure of the vehicle.

  The bracket 13 further includes a front plate portion 25 that extends from the front end of the side plate portion 22 toward the outside in the vehicle width direction. The front plate portion 25 has an inverted trapezoidal shape that expands downward from the upper end of the side plate portion 22. The front plate portion 25 has a plurality of fastening holes 25h, and the front plate portion 25 is a bumper by a fastening member that passes through one fastening hole of the bumper reinforcement 15 and one fastening hole 25h of the front plate portion 25. Fastened to the reinforcement 15. In addition, the front board part 25 should just have at least 1 fastening hole 25h.

  As shown in FIG. 3, the cylindrical portion 21 includes a cylindrical main body 31 having a cylindrical shape extending along the vertical direction, and a fastening plate 32 having a plate shape extending from the cylindrical main body 31 toward the outside in the vehicle width direction. And. The cylinder body 31 has, for example, a rectangular cylinder shape. The fastening plate part 32 has, for example, a rectangular plate shape, and has a plurality of cylindrical part fastening holes 32h that penetrate the fastening plate part 32 in the front-rear direction. The fastening plate part 32 is a single fastening hole of the FUP 14. The FUP 14 is fastened by a fastening member that passes through one cylindrical portion fastening hole 32h. The fastening plate portion 32 has a recess 32d that is recessed along the vehicle width direction. The fastening plate portion 32 only needs to have at least one cylindrical portion fastening hole 32h, and may not have the recess 32d.

  The cylindrical portion 21 further forms an upper reinforcing plate portion 33 extending from the upper end of the fastening plate portion 32 toward the rear along the front and rear direction along the outer surface of the cylindrical portion main body 31, and a bottom portion of the cylindrical portion main body 31. And a lower reinforcing plate portion 34 extending rearward from the lower end of the fastening plate portion 32 along the front-rear direction.

  As shown in FIG. 4, the width along the front-rear direction at the upper end of the cylindrical portion 21 is the cylindrical front-rear width W1, and the width along the front-rear direction at the upper end of the wide portion 23 is the wide front-rear width W2. The width in the front-rear direction of the face plate portion 22 is the plate portion front-rear width W3. The wide portion 23 has a shape in which the width along the front-rear direction is larger toward the front and rear than the upper end of the tube portion 21 from the tube portion 21 toward the side plate portion 22.

  The wide portion 23 is, for example, such that the front edge of the wide portion 23 gradually expands forward from the upper end of the tubular portion 21 toward the side plate portion 22, so that the wide edge 23 is larger than the front edge at the upper end of the tubular portion 21. It has a shape located in the front. In addition, the wide portion 23 is configured such that, for example, the rear edge of the wide portion 23 gradually widens from the middle toward the side plate portion 22 from the upper end of the tubular portion 21 to the rear, thereby It has a shape located behind the edge.

  Thereby, the width along the front-rear direction of the wide portion 23 gradually increases from the front-rear width W1 that is the minimum width toward the front-rear width W2 that is the maximum width. The side plate portion 22 has a plate portion front-rear width W3 that is equal to or greater than the wide portion front-rear width W2 that is the maximum width of the wide portion 23.

  As described above, the bracket 13 has the wide portion 23 that is larger forward and rearward than the upper end of the cylindrical portion 21, so that the range in which the bracket 13 and the side frame 11 can be fastened is expanded.

  In the side plate part 22, the part where the plurality of front fastening holes 22hf are located is a front fastening part C1 which is a fastening part between the side plate part 22 and the side frame 11, and the part where the plurality of rear fastening holes 22hr are located. This is a rear fastening portion C <b> 2 that is a fastening portion between the side plate portion 22 and the side frame 11. The front fastening part C1 and the rear fastening part C2 are examples of the plate part fastening part. In the tubular portion 21, the portion where the plurality of tubular portion fastening holes 32h are located is a tubular portion fastening portion C3 that is a fastening portion between the tubular portion 21 and the FUP 14.

  In the front-rear direction, the front fastening portion C1 is located in front of the tubular portion fastening portion C3, and the rear fastening portion C2 is located behind the tubular portion fastening portion C3. That is, the plate part fastening part is located in the front and back of the cylinder part fastening part C3 in the front-rear direction.

  As shown in FIG. 5, the width along the vehicle width direction at the upper end of the cylindrical portion 21 is the cylindrical portion longitudinal width W4, and the width along the vehicle width direction at the upper end of the wide portion 23 is the wide portion longitudinal width W5. . In the tube portion main body 31, the tube portion longitudinal width W4 and the tube portion longitudinal width W1 are constant along the vertical direction. That is, in the cylinder part main body 31, the cross-sectional shape along a horizontal direction is constant along an up-down direction.

  The wide portion 23 has a shape in which the width along the vehicle width direction gradually decreases from the upper end of the cylindrical portion 21 toward the side plate portion 22 from the cylindrical portion 21 toward the side plate portion 22. Thereby, the width along the vehicle width direction of the wide portion 23 gradually decreases from the cylindrical portion longitudinal width W4 that is the maximum width toward the wide portion longitudinal width W5 that is the minimum width.

  Moreover, the cylinder part main body 31 is located outside the side plate part 22 in the vehicle width direction, that is, the cylinder part main body 31 is on a surface fastened to the side surface 11 a of the side frame 11 in the side plate part 22. It is located on the outer side in the vehicle width direction with respect to the straight line L22 extending in the vertical direction along. That is, while the cylinder part 21 is located on the outer side in the vehicle width direction than the side frame 11, the upper end of the wide part 23 is located on the inner side in the vehicle width direction than the side plate part 22. Thus, the wide portion 23 extends from the tubular portion 21 toward the side plate portion 22 while gently bending from the outside in the vehicle width direction toward the inside.

  Here, the portion of the FUP 14 that is sandwiched between the two brackets 13 in the vehicle width direction is supported by the two brackets 13, while the FUP 14 is positioned on the outer side in the vehicle width direction than the brackets 13. Each of the parts is supported by one bracket 13. Therefore, the shape of the FUP 14 is likely to change when the FUP 14 receives a load from the front of the FUP 14 in a portion located outside the bracket 13 in the vehicle width direction in the FUP 14.

  In this respect, since the tubular portion 21 is located outside the side frame 11 in the vehicle width direction, the tubular portion fastening portion C3 that is the portion where the tubular portion 21 and the FUP 14 are fastened is one end of the FUP 14 in the vehicle width direction. Approach the department. Therefore, the shape of the FUP 14 is less likely to change because the distance between the end portion of the FUP 14 and the tubular portion fastening portion C3 is reduced. Therefore, the resistance against the load received by the FUP 14 is increased in the shock absorbing structure of the vehicle.

  On the other hand, in the fastening plate portion 32, the width along the vertical direction is the plate portion vertical width W6, and the vertical width in the portion of the FUP 14 in contact with the fastening plate portion 32 is the FUP vertical width W7. The plate portion vertical width W6 is equal to the FUP vertical width W7.

[Plate members constituting the bracket]
The plate member constituting the bracket 13 will be described with reference to FIG.
As shown in FIG. 6, the bracket 13 includes a cylinder forming plate 41, a cylinder sealing plate 42, a lower surface plate 43, a front plate 44, a fastening plate 45, an upper reinforcing plate 46, and a lower reinforcing plate 47. Has been. The cylinder forming plate 41 has a shape that extends in the up-down direction and that each of two end portions in the front-rear direction is bent in the vehicle width direction over the entire up-down direction. The cylinder forming plate 41 has an upper forming part 41 a that forms the wide part 23 of the bracket 13 and a lower forming part 41 b that forms the cylindrical part body 31 of the bracket 13. The lower forming portion 41b has a constant cross-sectional shape along the vertical direction along the horizontal direction.

  The cylinder sealing plate 42 extends along the vertical direction and is located between the plate forming part 42a positioned at the upper end, the cylinder forming part 42b including the lower end, and the plate forming part 42a and the cylinder forming part 42b in the vertical direction. It has an intermediate forming part 42c located between them. The tube forming portion 42b has a plate shape that extends linearly along the vertical direction.

  And the outer edge of the cylinder formation board 41 is welded to the outer edge of the cylinder formation part 42b in the cylinder sealing board 42, Therefore In the side plate part 22 in the bracket 13, the wide part 23, and the cylinder part main body 31 A portion excluding the bottom is formed. The plate forming part 42 a constituting the side plate part 22 constitutes one plate member with the intermediate forming part 42 c constituting the wide part 23 and the cylinder forming part 42 b constituting the tubular part body 31. Therefore, compared with a configuration in which the plate forming portion 42a is fixed by welding or fastening to a plate member constituted by the intermediate forming portion 42c and the tube forming portion 42b, the side plate portion 22 and the wide portion in the bracket 13 are provided. It is possible to prevent the force from concentrating on the portion where the head 23 is connected.

  The lower surface plate 43 is welded above the portion of the cylindrical body sealing plate 42 to which the cylindrical body forming plate 41 is welded to form the lower surface plate portion 24 of the bracket 13, and the front plate 44 is a cylindrical body. The front plate portion 25 of the bracket 13 is configured by being welded to the plate forming portion 42 a of the sealing plate 42. The fastening plate 45 is welded to the lower end portion of the tube forming portion 42b of the cylinder sealing plate 42 to constitute the fastening plate portion 32 of the bracket 13, and the upper reinforcing plate 46 is a tube forming portion of the cylinder sealing plate 42. The upper reinforcing plate 46 is configured by being welded to the portion 42 b and the fastening plate 45. The lower reinforcing plate 47 is welded to the lower end of the cylindrical body forming plate 41 and the lower end of the cylindrical body sealing plate 42 to form the bottom portion of the cylindrical body 31 in the bracket 13 and to the lower end of the fastening plate 45. The lower reinforcing plate portion 34 is formed by welding.

  In the cylinder part main body 31 of the bracket 13, the cross-sectional shape along the horizontal direction is constant along the vertical direction. Therefore, two or more types of brackets 13 having different widths along the vertical direction can be formed by pressing using one mold for each plate.

  That is, when the cylindrical body forming plate 41 is molded, different forming materials having different widths along the vertical direction in the portion corresponding to the lower side forming portion 41b are used, and the cylindrical body sealing plate 42 is molded. Further, different forming materials having different widths along the vertical direction in the portion corresponding to the tube forming portion 42b may be used.

  Alternatively, after each of the cylindrical body forming plate 41 and the cylindrical body sealing plate 42 is molded, the width along the vertical direction is shortened in the lower side forming portion 41b of the cylindrical body forming plate 41, and the cylindrical body sealing is performed. The width along the vertical direction in the tube forming portion 42b of the stop plate 42 may be shortened.

  Thus, according to the bracket 13 described above, a plurality of types of brackets 13 having different widths along the vertical direction can be formed using a single mold. Therefore, the cost required for equipment for manufacturing the bracket 13 can be reduced. Therefore, the cost required for manufacturing the bracket 13 can be reduced.

[Operation of vehicle cushioning structure]
With reference to FIG. 7, the operation of the shock absorbing structure of the vehicle will be described.
As shown in FIG. 7, for example, when another vehicle having a vehicle height lower than that of the host vehicle including the FUP 14 collides with the front end portion of the host vehicle, a load acts on the FUP 14 from the front. At this time, in the bracket 13, the cylinder portion fastening portion C3 that is a fastening portion between the FUP 14 and the bracket 13 serves as a power point, the rear fastening portion C2 serves as a fulcrum, and the front fastening portion C1 serves as an action point. Therefore, a part of the load that acts on the force point that is the fastening portion between the FUP 14 and the bracket 13 acts as a force that presses against the side frame 11 so as to move the fulcrum upward.

  On the other hand, the remaining portion of the load acting on the force point acts on the action point so as to move the action point obliquely backward. Therefore, only a part of the load acting on the FUP 14 acts on the bracket 13 as a force that can deform the bracket 13. As a result, the deformation of the bracket 13 is suppressed as compared with a bracket having a shape in which all of the force acting on the force point acts as a force acting on the action point.

  In addition, since the cylindrical portion 21 and the wide portion 23 have a cylindrical shape, the bracket 13 is less likely to be deformed rearward due to the load that the FUP 14 receives from the front of the FUP 14 than when the bracket is configured by a plate member. Become. In addition, the weight of the bracket 13 can be reduced compared to a configuration in which the bracket 13 is solid. As a result, in the shock absorbing structure of the vehicle, the weight can be reduced while increasing the resistance to the force acting on the FUP 14.

  Moreover, according to the bracket 13, since the force acting on the FUP 14 from the front is dispersed as described above, a desired load can be obtained even when the width of the wide portion 23 along the vehicle width direction is reduced. It becomes possible. Therefore, in the bracket 13, the weight of the wide portion 23 along the vehicle width direction is reduced, so that the weight of the bracket 13 and thus the weight of the shock absorbing structure of the vehicle can be reduced. In this manner, the weight of the vehicle can be reduced by the amount that the weight of the shock absorbing structure of the vehicle is reduced. Therefore, the weight of the luggage that can be loaded on the vehicle increases, and the fuel efficiency of the vehicle increases.

  Furthermore, in the vertical direction, the width of the fastening plate portion 32 of the cylindrical portion 21 and the width of the FUP 14 are equal to each other. Therefore, compared to a configuration in which the width of the fastening plate portion 32 is larger than the width of the FUP 14, the force is less likely to concentrate on the tubular portion fastening portion C3. Therefore, the shapes of the FUP 14 and the bracket 13 are unlikely to change in the tube portion fastening portion C3.

As described above, according to the above-described embodiment, the effects listed below can be obtained.
(1) Since the bracket 13 has the wide portion 23 that is larger forward and rearward than the upper end of the cylindrical portion 21, the range in which the bracket 13 and the side frame 11 can be fastened is expanded. When a load acts on the FUP 14 from the front, in the bracket 13, the rear fastening portion C2 serves as a fulcrum, and the front fastening portion C1 serves as a working point. Therefore, a part of the force that acts on the force point that is the fastening portion between the FUP 14 and the bracket 13 acts as a force that presses the fulcrum against the side frame 11. Therefore, since only the remaining portion of the force acting on the force point acts on the bracket 13 as a force that can deform the bracket 13, it is possible to suppress the shape of the bracket 13 from changing.

  (2) Since the portion of the wide portion 23 along the vehicle width direction has a smaller shape closer to the end of the side frame 11, the weight of the bracket 13 and thus the weight of the shock absorbing structure of the vehicle can be reduced.

  (3) The bracket 13 is fastened to the side surface 11a and the lower surface 11b of the side frame 11. For this reason, as the number of fastening portions of the bracket 13 increases, the resistance to the load received by the FUP 14 increases in the shock absorbing structure of the vehicle.

  (4) Since the cylinder portion 21 is located outside the side frame 11 in the vehicle width direction, the cylinder portion fastening portion C3 and the FUP 14 are compared with the configuration in which the cylinder portion 21 is located inside the side frame 11 in the vehicle width direction. The distance to the end is short. Therefore, the change in the shape of the FUP 14 can be suppressed as the distance between the end portion of the FUP 14 and the tubular portion fastening portion C3 is reduced. Therefore, the resistance against the load received by the FUP 14 is increased in the shock absorbing structure of the vehicle.

  (5) In the vertical direction, the width of the fastening plate portion 32 of the cylindrical portion 21 and the width of the FUP 14 are equal to each other. For this reason, it is difficult for stress to concentrate on the cylinder portion fastening portion C3 that is the fastening portion between the FUP 14 and the bracket 13. Therefore, the shape of the FUP 14 and the shape of the bracket 13 are unlikely to change at the tube portion fastening portion C3.

  (6) Since the cross-sectional shape along the horizontal direction is constant along the vertical direction in the cylindrical body 31, a manufacturing method that can reduce the cost required for manufacturing the bracket 13 is adopted as the manufacturing method of the bracket 13. Can do.

The embodiment described above can be implemented with appropriate modifications as follows.
-In the cylinder part main body 31, the cross-sectional shape along a horizontal direction may not be constant along an up-down direction. Even with such a configuration, it is possible to obtain the effects according to the above-described (1) to (5).

  In the fastening plate portion 32, the width along the vertical direction may be different from the width along the vertical direction in the FUP 14. That is, in the fastening plate portion 32, the width along the vertical direction may be larger or smaller than the width along the vertical direction of the FUP 14. Even with such a configuration, the effects according to (1) to (4) and (6) described above can be obtained.

  -The cylinder part 21 does not need to have the fastening plate part 32. In this case, the fastening part of FUP14 should just be located in a cylinder part, for example. Even with such a configuration, the effects according to (1) to (4) and (6) described above can be obtained.

  -The position of the cylinder part 21 in the vehicle width direction may not be outside the side frame 11. The position of the cylinder portion 21 in the vehicle width direction may overlap with the position of the side frame 11, or the position in the vehicle width direction may be inside the side frame 11. Even with such a configuration, the effects according to the above (1) to (3), (5), and (6) can be obtained.

  The bracket 13 does not need to include the lower surface plate portion 24. In this case, the bracket 13 may be fastened to the side frame 11 only by the side surface plate portion 22. Even with such a configuration, the effects according to the above-described (1), (2), and (4) to (6) can be obtained.

  In the wide portion 23, the width along the vehicle width direction may be constant from the tubular portion 21 toward the side plate portion 22. Alternatively, in the wide portion 23, the width along the vehicle width direction may gradually increase from the tubular portion 21 toward the side plate portion 22. Even with such a configuration, the effects according to (1) and (3) to (6) can be obtained.

  The cylinder sealing plate 42 does not have to be composed of one plate member, but is composed of a plurality of plate members, and a plurality of plate members are fixed to each other to form one cylinder sealing plate. May be.

  -The cylinder forming plate 41 does not have to be composed of one plate member, but is composed of a plurality of plate members, and a plurality of plate members are fixed to each other to form one cylinder forming plate. Also good. However, similarly to the cylinder sealing plate 42, it is preferable that the cylinder forming plate 41 is also composed of one plate member in order to prevent the force from being concentrated on a predetermined portion of the cylinder forming plate 41.

  -The embodiment mentioned above and the modification can also be implemented in combination as appropriate. If the bracket 13 has the wide portion 23 and the tube portion fastening portion C3 is located between the front fastening portion C1 and the rear fastening portion C2 in the front-rear direction, at least the above-described (1). The effect according to can be obtained.

  In the present disclosure, in the shock absorbing structure of the vehicle, the cylinder part 21 and the wide part 23 do not have to have a hollow shape in order to obtain a desired resistance to the load, and both the cylinder part 21 and the wide part 23 are medium. It may be real. Alternatively, one of the cylindrical portion 21 and the wide portion 23 may be solid. Even in such a configuration, the plate portion fastening portion in the front-rear direction has a plate portion fastening portion located in front of the tube portion fastening portion and a plate portion fastening portion located behind the tube portion fastening portion. If so, it is possible to obtain the desired resistance to the load.

  DESCRIPTION OF SYMBOLS 11 ... Side frame, 11a ... Side surface, 11b ... Lower surface, 11c ... Upper surface, 12 ... Front cross member, 13 ... Bracket, 14 ... Front underrun protector (FUP), 15 ... Bumper reinforcement, 16 ... Bumper, 21 ... Tube , 22 ... side plate part, 22 hf ... front fastening hole, 22 hr ... rear fastening hole, 23 ... wide part, 24 ... bottom plate part, 24 h ... fastening hole, 25 ... front plate part, 25 h ... fastening hole, 31 ... cylinder 32 ... fastening plate part, 32d ... hollow, 32h ... cylindrical part fastening hole, 33 ... upper reinforcing plate part, 34 ... lower reinforcing plate part, 41 ... cylindrical body forming plate, 41a ... upper forming part, 41b ... Lower side forming part, 42 ... Cylinder sealing plate, 42a ... Plate forming part, 42b ... Cylinder forming part, 42c ... Intermediate forming part, 43 ... Lower surface plate, 44 ... Front plate, 45 ... Fastening plate, 46 ... Upper reinforcement Plate, 47 ... Lower side Plates, C1 ... front fastening portion, C2 ... rear fastening portion, C3 ... cylindrical portion screwed portions.

Claims (5)

Side frames,
Front underrun protector,
A bracket for attaching the front underrun protector to the lower side of the side frame,
The bracket is
A cylindrical portion extending along the vertical direction to support the front underrun protector;
A plate portion fastened to the side frame;
It is composed of a wide part having a hollow shape connecting the cylindrical part and the plate part,
The wide portion has a shape in which the width along the front-rear direction, which is the longitudinal direction of the side frame, is larger toward the front and rear than the upper end of the tubular portion from the tubular portion toward the plate portion,
The fastening portion with the front underrun protector in the tubular portion is a tubular portion fastening portion,
The plate portion has a width equal to or greater than the maximum width of the wide portion in the front-rear direction, and has a plurality of plate portion fastening portions that are fastening portions with the side frames, and in the front-rear direction, see contains said plate portion engagement portion positioned further forward than the tubular portion screwed portions, and said plate portion engagement portions located behind the said cylindrical portion screwed portions,
The wide part is
A shock absorbing structure for a vehicle having a shape in which a width along a vehicle width direction, which is a direction in which the front underrun protector extends, gradually becomes smaller than an upper end of the tube portion from the tube portion toward the plate portion . The side frame is
A side surface extending along the longitudinal direction;
A lower surface extending along the longitudinal direction,
The plate portion is a side plate portion that extends along the side surface from the upper end of the wide portion and is fastened to the side surface,
The bracket is
The shock absorbing structure for a vehicle according to claim 1, further comprising a lower surface plate portion that extends from an upper end of the wide portion along the lower surface and is fastened to the lower surface. The direction in which the front underrun protector extends is the vehicle width direction,
An end in the vehicle width direction of the front underrun protector is located outside the side frame,
The tubular portion, the buffer structure according to claim 1 or 2 located outside of the side frame in the vehicle width direction. The cylindrical portion is
A tube body,
A fastening plate portion that extends along a vehicle width direction that is a direction in which the front under-run protector extends from the tubular portion main body, and in which the tubular portion fastening portion is located;
The buffer structure for a vehicle according to any one of claims 1 to 3 , wherein a width along the vertical direction of the fastening plate portion is equal to a width along the vertical direction of the front underrun protector. In the tube body,
The buffer structure for a vehicle according to claim 4 , wherein a cross-sectional shape along the horizontal direction is constant along the vertical direction.