JP5515510B2 - Body structure - Google Patents

Description

  The present invention relates to a vehicle body structure in which a hook member can be attached in the vicinity of an end portion of a side member in a vehicle longitudinal direction.

  For example, Patent Documents 1 and 2 below describe a vehicle body structure that attempts to ensure rigidity against load input by a hook member such as a traction hook or a tie-down hook in the vicinity of an end portion of the side member in the vehicle longitudinal direction. In this vehicle body structure, a cross member is coupled to a side member, and a hook member such as the above-described pulling hook is attached using the coupling portion.

JP 7-89448 A JP-A-8-207825

  However, the above-described conventional vehicle body structure is inferior in versatility because rigidity is secured by attaching a hook member such as a traction hook to the joint portion between the side member and the cross member.

  Therefore, an object of the present invention is to make it possible to set a hook attachment member while ensuring rigidity without using a coupling portion between a side member and a cross member.

In the present invention, the side member has an inner member and an outer member, each member forms a closed cross section, and a closing plate for closing the opening of the side member in the vehicle front-rear direction is provided. An L-shaped reinforcing member having a side surface portion coupled to the side surface of the side member and a bottom surface portion coupled to the lower surface of the side member is attached to the inner surface of the inner member near the closing plate on the outer member side. The reinforcing member and the closing plate are coupled to each other , and the bumper attaching member is attached to the side surface portion of the reinforcing member via the inner member, while the hook attaching member is attached to the bottom surface portion of the reinforcing member. Car body structure.

  According to the present invention, since the closing plate attached to the opening of the side member and the reinforcement member provided in the side member are coupled to each other, the input to the hook attachment member and the bumper attachment member attached to the reinforcement member The load is also transmitted to the closing plate and dispersed, so that the hook attachment member and the bumper attachment member can be attached to the side member while ensuring rigidity without using the joint portion between the side member and the cross member.

1 is a perspective view of a vehicle body structure showing an embodiment of the present invention. FIG. 2 is an exploded perspective view of a rear end portion of a side member in the vehicle body structure of FIG. 1. It is a front view at the time of the assembly | attachment which looked at the side member of FIG. 2 from the vehicle rear using a closing plate as a dashed-two dotted line. It is a perspective view at the time of the assembly | attachment which made the inner member of the side member of FIG. 2 the dashed-two dotted line. It is a perspective view at the time of the assembly | attachment which abbreviate | omitted the outer member of the side member of FIG. It is the perspective view which made the inner member of FIG. 4 the continuous line, and provided the weld bead. It is a disassembled perspective view of the vehicle body frame of FIG. 1, a bumper, and a hook attachment member. FIG. 2 is an enlarged perspective view showing a joint portion between a side member, a bumper stay, and a hook mounting member in the vehicle body frame of FIG. 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a vehicle body frame 1 disposed at the bottom of a vehicle includes a pair of side members 3 extending in the vehicle front-rear direction on both sides in the vehicle width direction. A plurality of cross members 5 to 21 extending in the width direction are connected. A rear bumper 51 shown in FIG. 7 and a hook attachment member 53 having a tie-down hook (not shown) as a hook member are attached to the rear portion of the vehicle body frame 1. The tie-down hook is used for locking a fixed rope for fixing the vehicle body when transporting a ship. In addition, the direction shown by the arrow FR in the figure is the vehicle front.

  As shown in FIGS. 2 and 3, the side member 3 includes an inner member 25 having a U-shaped cross section that is located on the vehicle inner side (right side in FIGS. 2 and 3) and opens to the vehicle outer side, and the vehicle outer side (FIG. 2). , 3, and an outer member 27 having a U-shaped cross section that opens to the inside of the vehicle.

  That is, the inner member 25 includes a side surface 25a on the vehicle inner side, an upper surface 25b extending from the upper end of the side surface 25a to the outer side in the vehicle width direction, and a lower surface 25c extending from the lower end of the side surface 25a to the outer side in the vehicle width direction. On the other hand, the outer member 27 includes a vehicle outer side surface 27a, an upper surface 27b extending inward in the vehicle width direction from the upper end of the side surface 27a, and a lower surface 27c extending inward in the vehicle width direction from the lower end of the side surface 27a.

  The upper surface 27b of the outer member 27 is positioned outside (upper side) of the upper surface 25b of the inner member 25, and the lower surface 27c of the outer member 27 is positioned outside (lower side) of the lower surface 25c of the inner member 25. Thus, the outer member 27 and the inner member 25 are coupled in a state where the respective opening portions face each other.

  Although omitted in FIG. 3, a bracket 29 for attaching the vehicle body frame 1 to another vehicle body member (not shown) is provided outside the outer member 27 in the vehicle width direction so as to protrude outward in the vehicle width direction. It is.

  As shown in FIGS. 4 and 5, a reinforcing member 31 is attached to the inner surface on the outer member 27 side of the inner member 25 in the vicinity of the vehicle rear end, which is the vehicle front-rear direction end of the side member 3. The reinforcing member 31 includes a side surface portion 31a coupled to the inner surface of the side surface 25a of the inner member 25 and a bottom surface portion 31b coupled to the lower surface 25c of the inner member 25, and has a substantially L-shaped cross section. That is, the reinforcing member 31 has an L-shaped cross section including a side surface portion 31 a coupled to the side surface of the side member 3 and a bottom surface portion 31 b coupled to the lower surface of the side member 3.

  The side surface portion 31a of the reinforcing member 31 has a substantially triangular shape when viewed from the vehicle width direction, and the vicinity of the top of the triangular shape is located near the upper surface 25b of the inner member 25. Weld nuts 33 are attached to the surface opposite to the inner member 25 in the vicinity of both ends in the vehicle longitudinal direction. Further, weld nuts 35 are also attached to two upper surfaces of the bottom surface portion 31b of the reinforcing member 31 in the vehicle front-rear direction.

  Corresponding to these weld nuts 33 and 35, through holes 31a1 and 31b1 serving as bolt insertion holes are formed in the side surface portion 31a and the bottom surface portion 31b of the reinforcing member 31. Corresponding to the through holes 31a1 and 31b1, through holes 25a1 and 25c1 serving as bolt insertion holes are also formed on the side surface 25a and the lower surface 25c of the inner member 25. Further, a through hole 27 c 1 is formed in the lower surface 27 c of the outer member 27 corresponding to the through hole 25 c 1 in the lower surface 25 c of the inner member 25.

  As shown in FIG. 5, the reinforcing member 31 includes a pair of triangular slopes, an end portion on the vehicle front side of the bottom surface portion 31 a, and a long hole 31 b 2 provided substantially at the center of the bottom surface portion 31 a. Weld beads 37, 39, 41 by arc welding are formed and fixed to the inner member 25 by welding.

  As shown in FIG. 2, the side member 3 including the inner member 25 and the outer member 27 has an opening at the rear end of the vehicle, and a closing plate 45 is attached so as to close the opening 43. The closing plate 45 includes bent portions 45b, 45c, 45d, and 45e that are bent toward the front of the vehicle from the four sides around the plate body portion 45a aligned with the rectangular opening 43, and each of the bent portions 45b, 45c, 45d, and 45e are inserted into the opening 43.

  At this time, the upper bent portion 45b is on the upper surface 25b of the inner member 25, the bent portion 45e on the inner side in the vehicle width direction is on the side surface 25a of the inner member 25, and the bent portion 45d on the outer side in the vehicle width direction is on the side surface 27a of the outer member 27. They are almost in contact with each other, and the lower bent portion 45 c is placed on the bottom surface portion 31 b of the reinforcing member 31.

  The bending portion 45e on the inner side in the vehicle width direction of the closing plate 45 includes a relief portion 45f corresponding to the vehicle rear end side portion 31a2 in the side surface portion 31a of the reinforcing member 31, as shown in FIG.

  In this state, the closing plate 45 is coupled to the side member 3 by forming a bead 47 that forms a welded joint by arc welding around the closing plate 45 as shown in FIG. By attaching the closing plate 45 so as to close the opening 3 of the side member 3, deformation of the closed cross-sectional shape of the side member 3 is suppressed.

  The above-described bead 47 joins the closing plate 45 and the opening 43 of the side member 3 over the entire circumference. At this time, the bead 47 also joins the lower part of the closing plate 45 and the reinforcing member 31 to each other. ing. That is, the bead 47 that is the above-described welded joint includes a coupling portion 47 a that couples the closing plate 45 and the reinforcing member 31 to each other. Further, the connecting portion 47a includes a corner portion 31c at the rear end portion of the vehicle between the side surface portion 31a and the bottom surface portion 31b of the L-shaped reinforcing member 31, and a corner of the closing plate 45 corresponding to the corner portion 31c. The parts 45g are connected to each other.

  2 to 6 show the left side member 3 in FIG. 1, the right side member 3 in FIG. 1 has only a left-right symmetric structure with respect to the left side member 3. Thus, it is the same as the left side member 3.

  As shown in FIG. 7, bumper stays 36 as bumper attachment members projecting toward the rear of the vehicle are provided at two locations in the vehicle width direction of the rear bumper 51. The bumper stays 36 are connected to the side members as shown in FIG. 3 is attached to the inner surface in the vehicle width direction (side surface 25a of the inner member 25) using the bolt 30 and the weld nut 33 described above.

  On the other hand, the hook attachment member 53 shown in FIG. 7 uses the bolt 55 and the above-described weld nut 35 in the vicinity of the rear bumper 51 in a state where the hook attachment member 53 is in contact with the lower surface of the side member 3 (the lower surface 27c of the outer member 27). Attach to side member 3. The front end portion of the hook attachment member 53 is also attached to the lower surface of the side member 3 (the lower surface 27c of the outer member 27) using a bolt 57 and a weld nut (not shown) provided on the side member 3 side.

  A hook attachment hole 53a for attaching a tie-down hook as a hook member (not shown) is provided on the inner surface in the vehicle width direction of the hook attachment member 53 described above. It is assumed that a weld nut is provided inside the hook attachment hole 53a.

  Although a pair of hook attachment members 53 shown in FIG. 7 are provided in the vehicle width direction, the rear end portions of the pair of hook attachment members 53 are connected to each other by a connecting portion extending in the vehicle width direction. Are united.

  Next, the operation will be described. When a load is input to a tie-down hook (not shown) that can be attached to the hook attachment member 53, the input load is transmitted from the side member 3 to the reinforcing member 31 at the fastening portion of the hook attachment member 53 by the bolt 55. In addition to being dispersed, the reinforcing member 31 is also transmitted to the closing plate 45 through the coupling portion 47a between the reinforcing member 31 and the closing plate 45 and dispersed.

  On the other hand, the load input to the rear bumper 51 is transmitted and dispersed from the side member 3 to the reinforcing member 31 via the bumper stay 36, and from the reinforcing member 31 to the reinforcing member 31 and the closing plate 45 through the connecting portion 47 a. It is also transmitted to the closing plate 45 and dispersed.

  At this time, each input load is also handled by the weld beads 37, 39, 41 between the reinforcing member 31 and the inner member 25 shown in FIG. 5 and also by the weld beads 47 provided on the entire circumference of the closing plate 45. It will be.

  The vertical component of the load transmitted to the closing plate 45 is mainly received in the plane direction by the plate main body 45a, while the vehicle longitudinal component is mainly received by the surrounding weld bead portion 47 from the coupling portion 47a. Will receive.

  As described above, according to the present embodiment, the load input to the hook attachment member 53 and the rear bumper 51 is transmitted and dispersed not only to the reinforcing member 31 provided on the side member 3 but also to the closing plate 45. As a result, the hook mounting member 53 and the rear bumper 51 can be mounted only on the side member 3 without using the connecting portion between the side member 3 and the cross member (for example, the cross member 21 in FIG. 1). In addition, the hook attachment member 53 and the rear bumper 51 can be set while securing rigidity, and versatility is enhanced.

  In the present embodiment, the reinforcing member 31 has an L-shaped cross section including a side surface portion 31 a coupled to the side surface of the side member 3 and a bottom surface portion 31 b coupled to the lower surface of the side member 3. While attaching the rear bumper 51 to 31a, the hook attachment member 53 provided with a traction hook is attached to the bottom face part 31b.

  Therefore, the two members, the rear bumper 51 and the hook attachment member 53, can be easily attached to the reinforcing member 31 provided on the side member 3 while ensuring rigidity.

  Moreover, in this embodiment, the bead part 47 used as the welding junction part which joins and fixes these both by welding between the closing plate 45 and the vehicle front-back direction edge part provided with the opening part 43 of the side member 25 is provided, The bead portion 47 includes a coupling portion 7 a that couples the reinforcing member 31 and the closing plate 45 to each other.

  For this reason, the closing plate 45 and the reinforcing member 31 can be welded at the joint 47a included in the weld bead 47 at the same time in the work process of welding the periphery of the closing plate 45 with the weld bead 47, and these are performed in separate processes. Compared to the case, the processing cost can be reduced.

  In the present embodiment, the reinforcing member 31 has an L-shaped cross section including a side surface portion 31 a coupled to the side surface of the side member 25 and a bottom surface portion 31 b coupled to the lower surface of the side member 25. The corner portion 31c between the side surface portion 31a and the bottom surface portion 31b of the L-shaped reinforcing member 31 and the corner portion 45g of the closing plate 45 corresponding to the corner portion 31c are coupled to each other.

  For this reason, load transmission between the reinforcing member 31 and the closing plate 45 is made more efficient, and the rigidity at the time of load input can be ensured more reliably.

  Further, in the present embodiment, since the lower end portion of the closing plate 45 is directly coupled to the bottom surface portion 31b of the reinforcing member 31, load transmission between the reinforcing member 31 and the closing plate 45 is further efficiently performed. The rigidity at the time of load input can be further ensured.

3 Side member 25 Inner member of side member 27 Outer member of side member 31 Reinforcing member 31a Side surface portion of reinforcing member 31b Bottom surface portion of reinforcing member 31c Corner portion between side surface portion and bottom surface portion 36 Bumper stay (bumper mounting member)
43 Side member rear end opening 45 Closing plate 45g Closing plate corner 47 Weld bead (welded joint)
47a Joint part of reinforcing member and closing plate 53 Hook mounting member

Claims (4)

A side member extending in the vehicle front-rear direction is provided on the side in the vehicle width direction of the vehicle. The side member includes an inner member located on the inner side of the vehicle and an outer member located on the outer side of the vehicle. A closing plate is formed, and a closing plate is attached to an opening of the side member in the longitudinal direction of the side member so as to close the opening, and an inner surface on the outer member side of the inner member in the vicinity of the closing plate A reinforcing member having an L-shaped cross section having a side surface portion coupled to the side surface of the side member and a bottom surface portion coupled to the lower surface of the side member, and the inner member is attached to the side surface portion of the reinforcing member. while Ru mounting the bumper attachment member via a mounting hook mounting member to the bottom portion of the reinforcing member, the said reinforcing member closing flop Vehicle body structure being characterized in that by combining the over bets with each other. Between the closing plate and the vehicle front-rear direction end portion provided with the opening of the side member, a welded joint portion is provided for joining and fixing the two together by welding, and the welded joint portion includes the reinforcing member and the closing member. The vehicle body structure according to claim 1 , further comprising a coupling portion that couples the plates to each other. The reinforcing member has an L-shaped cross section including a side surface portion coupled to the side surface of the side member and a bottom surface portion coupled to the lower surface of the side member, and the side surface of the reinforcing member having the L-shaped cross section. The vehicle body structure according to claim 1 or 2 , wherein a corner portion between the corner portion and the bottom surface portion and a corner portion of the closing plate corresponding to the corner portion are coupled to each other. The vehicle body structure according to claim 3 , wherein a lower end portion of the closing plate is coupled to a bottom surface portion of the reinforcing member.

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