JP2011016404A - Mounting structure for towing hook bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure without separately arranging holes and the like in a bumper reinforce, to sufficiently secure a welding length while attaining miniaturization, and to improve the strength against towing.SOLUTION: A hook bracket 20 for mounting a towing hook 30 is fixed to the bumper reinforce 10, the hook bracket 20 is formed, in an integral manner, of a front sheet member 21 abutted on the front face of the bumper reinforce 10, a back sheet member 22 arranged at the lower end of the front sheet member 21 and abutted on the lower face of the bumper reinforce 10, and a hook fixing member 23 protruding downward from the back sheet member 22 for attaching the towing hook 30, and at least the gap between the upper end of the front sheet member 21 and the front face of the bumper reinforce 10, and the gap between the rear end of the back sheet member 22 and the lower end on the back face side of the bumper reinforce 10 are welded respectively.

Description

  The present invention relates to a structure for attaching a hook bracket for traction to a bumper reinforcement of an automobile.

Bumper reinforcements located at the front and rear of an automobile are provided with hook brackets for attaching tow hooks that are used for towing and for fixing at the time of loading.
As such a hook bracket mounting structure, techniques disclosed in Patent Documents 1 to 3 are known.
In the bumper reinforcement structure for an automobile body shown in Patent Document 1, a traction hook mounting portion is welded and fixed to the lower surface of the bottom wall of the bumper reinforcement, and the traction hook is screwed through the traction hook attachment portion. The protruding part (tow hook bracket) is fixed.
In the detachable traction hook mounting structure for automobiles shown in Patent Document 2, the base of a traction hook mounting member (traction hook bracket) to which the traction hook is screwed is arc-welded to the front wall of the bumper reinforcement.
In the hook bracket mounting portion structure shown in Patent Document 3, the hook bracket to which the tow hook is screwed is placed in the hole formed in the bumper reinforcement, and the hook of the hook bracket is used as the bumper reinforcement. It is set as the structure fixed to the wall part by welding.

JP 2008-279876 A JP 2004-299636 A JP 2006-36158 A

By the way, the hook bracket shown by the said patent document 1 and 2 is a structure fixed by welding to the lower surface or front surface of a bumper reinforcement, and with respect to the pulling force which acts on a hook bracket at the time of the time of traction or shipping There is a risk that durability will be impaired due to insufficient strength. In order to improve the strength, it may be possible to increase the depth dimension of the bumper reinforcement or the vertical dimension of the front surface and attach a larger hook bracket accordingly, but this increases the cost due to the increase in size.
On the other hand, in the hook bracket shown in Patent Document 3, it is necessary to separately provide a hole for fixing the hook bracket to the bumper reinforcement, and there is a problem that the structure and the production process are complicated.

  The present invention has been made in view of the above circumstances, and has a simple structure without separately providing a hole or the like in the bumper reinforcement, and sufficiently secures a welding length while achieving downsizing, and can be used for towing and shipping. The purpose is to improve the durability by increasing the strength against the tensile force acting at the time of fixing.

  In the mounting structure of the tow hook bracket of the present invention, a hook bracket for mounting the tow hook is fixed to the bumper reinforcement, and the hook bracket is a front plate member that comes into contact with the front surface of the bumper reinforcement. A back plate member provided at a lower end of the front plate member and abutted against a lower surface of the bumper reinforcement, and a hook fixing member for projecting downward from the back plate member and attaching the tow hook. It is integrally formed, and at least between the upper end portion of the front plate member and the front surface of the bumper reinforcement, and between the rear end portion of the back plate member and the lower end portion on the back side of the bumper reinforcement, respectively. It is welded.

  By adopting this attachment structure, the hook bracket is welded to the front and back lower end portions of the bumper reinforcement, and the bumper reinforcement is sandwiched between these welds. Therefore, the bumper reinforcement arranged between the two welds functions as a strength member and reinforces the hook bracket, so that a strong fixing structure can be obtained.

  In the mounting structure of the tow hook bracket according to the present invention, the bumper reinforcement is formed in a rectangular frame shape in cross section, and a horizontal rib is provided so as to cross between the front wall and the rear wall, The upper end portion of the front plate member may be welded to the front surface of the joint portion between the lateral rib and the front wall.

  By adopting this mounting structure, a lateral rib is provided on the back of the welded portion on the front surface of the bumper reinforcement. On the other hand, the corners of the bumper reinforcement are welded at the lower end of the back side of the bumper reinforcement. Therefore, any welded portion is not a flat plate portion of the bumper reinforcement, but a portion having a large strength, and has a high welding strength. A box-shaped portion surrounded by the front wall, the rear wall, the lateral rib, and the lower wall of the bumper reinforcement is interposed between the two welded portions, and a stronger fixing structure can be obtained.

In the structure for attaching the pulling hook bracket of the present invention, it is more preferable that both side edges of the front plate member are welded to the bumper reinforcement.
By welding the front plate member in a U shape from the upper end portion to both side edge portions, a long weld length can be secured and the strength can be further increased.

  According to the mounting structure of the present invention, since the bumper reinforcement is interposed between the welded portions of the front plate member and the back plate member of the hook bracket, the bumper reinforcement functions as a strength member to reinforce the hook bracket. At the same time, since the welded portion is arranged at the corner of the lower end portion on the back side of the bumper reinforcement, the strength of the welded portion is increased, and durability against traction force can be enhanced. In this case, on the front surface of the bumper reinforcement, the strength is further improved by welding the upper end portion of the front plate member of the hook bracket to the place where the lateral rib is provided. In addition, by welding from the upper end of the front plate member of the hook bracket to both side edges, a long weld length can be secured on the front surface of the bumper reinforcement, and these synergistic effects stabilize the traction force. High strength. Therefore, without increasing the size of the hook bracket as in the prior art, the size and weight can be reduced and the strength can be increased. Moreover, it is not necessary to form a hole or the like for attachment to the bumper reinforcement.

It is a perspective view which shows the attachment structure to the bumper reinforcement for the tow hook bracket in 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the attachment part of the hook bracket of FIG. (A) of the attachment structure of FIG. 1 is a front view, (b) is a rear view. It is the longitudinal cross-sectional view similar to FIG. 2 which shows 2nd Embodiment of this invention. It is the longitudinal cross-sectional view similar to FIG. 2 which shows 3rd Embodiment of this invention. It is the longitudinal cross-sectional view similar to FIG. 2 which shows 4th Embodiment of this invention. It is a longitudinal cross-sectional view similar to FIG. 2 which shows 5th Embodiment of this invention. It is a perspective view which shows the attachment structure to the bumper reinforcement in 5th Embodiment of FIG. 7A is a front view, and FIG. 7B is a rear view, similar to FIG. 3 in the fifth embodiment of FIG. It is the longitudinal cross-sectional view similar to FIG. 2 which shows 6th Embodiment of this invention. It is the longitudinal cross-sectional view similar to FIG. 2 which shows 7th Embodiment of this invention. It is the longitudinal cross-sectional view similar to FIG. 2 which shows 8th Embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a structure for attaching a tow hook bracket according to the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment.
FIG. 1 shows a state in which a hook bracket is attached to a bumper reinforcement at the front of a vehicle body. In FIG. 1, a pair of reference numerals 1A and 1B are provided along the front-rear direction on both left and right sides of the vehicle body. It is a side member serving as a skeleton of the body, and a bumper stay 2 is fixed to the front end portions of the side members 1A and 1B. A bumper reinforcement 10 is interposed between the bumper stays 2 via fasteners (not shown) such as bolts It is fixed horizontally.

The bumper reinforcement 10 is manufactured by extruding aluminum and is formed in a rectangular frame-shaped cross section as a whole. The bumper reinforcement 10 includes a front wall 11 located on the front side of the vehicle body, a rear wall 12 located on the rear side of the vehicle body, an upper wall 13 and a lower wall that connect the front wall 11 and the rear wall 12 in the vertical position. The wall 14 is integrally formed, and a lateral rib 15 is integrally provided between the front wall 11 and the rear wall 12 and connected so as to cross the rectangular frame-shaped cross section at the center in the height direction. It has been.
In addition, a bumper fascia that covers the bumper reinforcement 10 from the front of the vehicle body is provided in front of the bumper reinforcement 10 (not shown).

  A hook bracket 20 is attached to a midway position in the length direction of the bumper reinforcement 10 thus configured (a midway position in the width direction of the vehicle body). As shown in FIG. 2, the hook bracket 20 includes a front plate member 21 disposed along the front wall 11 of the bumper reinforcement 10, and a back plate extending rearward along the lower wall 14 of the bumper reinforcement 10. The member 22 and the hook fixing member 23 provided so as to protrude downward from the back plate member 22 and to which the tow hook 30 is attached are integrally formed. Since the combined cross-sectional shape is shown in FIG. 2, a product that is continuously extruded in the width direction of the vehicle body (the length direction of the bumper reinforcement) with aluminum in the cross-sectional shape shown in FIG. It is formed by cutting. The hook fixing member 23 is formed with a screw hole 23a into which the traction hook 30 is screwed along the front-rear direction.

Further, as shown in FIG. 2, the upper end position of the front plate member 21 is arranged at the same height as the installation height of the lateral ribs 15 arranged in the bumper reinforcement 10.
The tow hook 30 is a so-called I bolt, and has a structure in which a ring 32 is integrally formed at the tip of the screw rod 31.

  The periphery of the front plate member 21 of the hook bracket 20 and the front surface of the front wall 11 of the bumper reinforcement 10 are welded, and the rear of the back plate member 22 protruding rearward from the back surface of the bumper reinforcement 10. A space between the upper surface of the end portion and the lower end portion of the back surface of the bumper reinforcement 10 is welded. Therefore, on the front surface of the bumper reinforcement 10, a welded portion W <b> 1 is formed in a U-shape along the periphery of the periphery from the upper end portion of the front plate member 21 of the hook bracket 20 to both side edges. A welded portion W2 is formed on the rear surface of the force 10 along the length direction (the width direction of the vehicle body) of the bumper reinforcement 10 on the rear end portion of the back plate member 22 of the hook bracket 20 protruding from the rear surface. The In this case, the upper end portion of the front plate member 21 of the hook bracket 20 on the front surface of the bumper reinforcement 10 is disposed at the same height as the lateral ribs 15 in the bumper reinforcement 10 and is welded at that portion. Therefore, the lateral rib 15 serves as a reinforcing material to improve the strength of the welded portion W1.

In this way, between the upper end portion of the front plate member 21 of the hook bracket 20 and the front surface of the front wall 11 of the bumper reinforcement 10, and between the rear end portion of the back plate member 22 and the rear surface of the bumper reinforcement 10. Since the welded portions W1 and W2 are formed between them, the box-shaped portion of the bumper reinforcement 10 (front wall 11, rear wall 12, lateral rib 15 and lower wall 14 is surrounded between the welded portions W1 and W2. The box-shaped portion of the bumper reinforcement 10 becomes a strength member, and the strength against the tensile force can be improved.
For example, in the loaded state, a tensile force acts diagonally downward as indicated by an arrow A in FIG. 2, and the tensile force A is applied to the welded portion W1 of the front plate member 21 around the point of action. As shown by the arrow B and the welded portion W2 of the back plate member 22 by the arrow C, a force acts in the rotational direction. In this case, since these welds W1 and W2 are arranged at diagonal portions of the box-shaped portion of the bumper reinforcement 10, the forces indicated by the arrows B and C are received by the entire box-shaped portion. The resistance to tension is large, and the fixed state can be held firmly.

  Also, the welded portions W1 and W2 are not formed on the mere flat plate portion, but are formed at the joint portion between the front wall 11 of the bumper reinforcement 10 and the lateral rib 15 and at the corner of the lower end portion of the back surface of the bumper reinforcement 10. These are portions that are not easily deformed and have a high strength. Therefore, they can exhibit a high strength against the stress concentration on the welded portions W1 and W2, and are not easily damaged such as cracks. Moreover, in the front plate member 21, not only the upper end portion but also both side edge portions are welded to form a welded portion W1 in a U-shape, and therefore the attachment strength to the bumper reinforcement 10 is increased by the long welded portion W1. Has been enhanced.

Although not particularly limited in terms of dimensions, the height D of the hook fixing member 23 of the hook bracket 20 is set to 30 to 60 mm, for example, and the depth dimension E is set to 30 as the depth dimension F of the bumper reinforcement 10. The width dimension G of the hook bracket 20 is set to 30 to 50 mm. Further, the thickness of the front plate member 21 and the back plate member 22 is 5 to 10 mm while the thickness of the bumper reinforcement 10 is 2.5 to 5 mm.
Further, as described above, the hook bracket 20 is formed by simply cutting the extruded shape of the cross-sectional shape with a predetermined width dimension G by adopting a cross-sectional shape corresponding to the cross-section of the bumper reinforcement 10. It can be manufactured with few processing steps.

  As described above, in this hook bracket 20, the bumper reinforcement 10 functions as a strength member by interposing the bumper reinforcement 10 in a box shape between the welded portions W <b> 1 and W <b> 2 to the front surface and the back surface of the bumper reinforcement 10. Since the welded portions W1 and W2 are the joint portions of the lateral ribs 15 of the bumper reinforcement 10 and the corners of the lower end of the back surface, and are for the portion with high strength, the strength of the welded portions W1 and W2 increases, A long weld length is ensured on the front surface of the bumper reinforcement 10, and by these synergistic effects, a high strength can be stably exhibited with respect to the traction force. Therefore, it is not necessary to increase the size of the hook bracket as in the prior art, and it is possible to achieve a high strength while reducing the size and weight. Of course, since it is fixed by welding, it is not necessary to make a hole or the like in the bumper reinforcement.

(Other embodiments)
4 to 12 show other embodiments. In these drawings, parts common to those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
In the first embodiment, the back plate member 22 of the hook bracket 20 protrudes rearward from the rear wall 12 of the bumper reinforcement 10 and is welded between the protruding portion and the rear surface of the rear wall 12 of the bumper reinforcement 10. However, like the hook bracket 40 of the second embodiment shown in FIG. 4, the length of the back plate member 41 is shortened, and the rear end portion of the lower plate 14 is formed on the lower plate 14 of the bumper reinforcement 10. It is good also as a structure welded between. Even in the case of this structure, the rear end portion of the back plate member 41 of the hook bracket 40 is welded to the corner of the box-shaped portion of the bumper reinforcement 10, so that it has high strength against stress concentration on the welded portion W2. It can be demonstrated.

  In the above embodiment, one lateral rib 15 is provided between the front wall 11 and the rear wall 12 of the bumper reinforcement 10 so as to cross the cavity of the rectangular frame-shaped cross section at the center. The number 15 is not limited to one, and a plurality of them may be provided in parallel so as to be parallel to each other as in the third embodiment shown in FIG. In the bumper reinforcement 45 shown in FIG. 5, two lateral ribs 15 are provided in two upper and lower stages. At this time, the upper end portion of the front plate member 47 of the hook bracket 46 is disposed at the same height as the installation location of the lower lateral rib 15, and the lower lateral rib 15 and the front wall 11 of the lower bumper reinforcement 45. The rear wall 12 and the lower wall 14 are supported by a box-shaped portion.

  FIG. 6 shows a fourth embodiment. The back plate member 52 of the hook bracket 50 is shortened with respect to the structure of the third embodiment of FIG. 5, and a bumper is formed as in the second embodiment shown in FIG. It is welded on the lower plate 14 of the reinforcement 45.

7 to 9 show a fifth embodiment. In the fifth embodiment, bumper reinforcements 55 are provided with convex portions 57A and 57B in the longitudinal direction at the upper and lower portions of the front wall 56, which are bent so that the front wall 56 projects forward. Are formed along. Further, since the front plate member 59 of the hook bracket 58 is disposed along the front wall 56 of the bumper reinforcement 55, the convex bent portion extends along the lower convex portion 57B of the front wall 56. 59a is formed.
In this case, since the convex bent portion 59a is welded to the convex portion 57B, a longer welding length can be obtained, and a stronger bond between the hook bracket 58 and the bumper reinforcement 55 can be ensured. it can. For this reason, the width dimension as the hook bracket 58 can be set small, and even in that case, it can have high attachment strength by sufficient welding length.

  FIG. 10 shows a sixth embodiment. The back plate member 61 of the hook bracket 60 is shortened with respect to the structure of the fifth embodiment, and the second embodiment shown in FIG. 4 and the fourth embodiment shown in FIG. It is welded on the lower plate 14 of the bumper reinforcement 55 as in the form.

FIG. 11 shows a seventh embodiment. In the seventh embodiment, the bumper reinforcement 65 has the same outer shape as that of the fifth and sixth embodiments, but is provided with two lateral ribs 15 at the top and bottom, and the front plate of the hook bracket 66. The upper end of the member 67 is welded to the installation location of the lower lateral rib 15.
In the eighth embodiment shown in FIG. 12, the front plate member 71 of the hook bracket 70 is welded in the vicinity of the upper lateral rib 15 of the two lateral ribs 15 inside the bumper reinforcement 65. Therefore, in the structure of the eighth embodiment, a box-shaped portion between the welded portion W1 at the upper end portion of the front plate member 71 and the welded portion W2 at the lower end portion of the back surface of the bumper reinforcement 65 is located inside. It becomes a structure provided with the one horizontal rib 15, strength becomes larger, and the further strength improvement is achieved.

In addition, various modifications may be made without departing from the gist of the present invention. For example, the welded portion between the bumper reinforcement and the back plate member of the hook bracket is provided after the bumper reinforcement shown in the above embodiment. A form (see FIGS. 2, 5, 7, 11, and 12) welded between the back surface of the wall and the protruding end portion of the back plate member of the hook bracket, and the back plate member of the hook bracket are shortened. In addition to the two forms of welding on the lower wall of the bumper reinforcement (see FIGS. 4, 6, and 10), the rear surface of the rear wall of the bumper reinforcement and the back plate member of the hook bracket It is good also as a structure which forms the end surface so that it may become flush | level and welds the back surface of these rear walls, and the rear-end surface of a backplate member. In any case, it is preferable to weld at the corner of the lower end of the bumper reinforcement.
Moreover, although the horizontal ribs 15 are provided in parallel in any of the embodiments, the horizontal ribs 15 may not be necessarily parallel but may be inclined in the horizontal direction.

1A, 1B Side member 2 Bumper stay 10 Bumper reinforcement 11 Front wall 12 Rear wall 13 Upper wall 14 Lower wall 15 Horizontal rib 20 Hook bracket 21 Front plate member 22 Back plate member 23 Hook fixing member 30 Tow hook 40 Hook bracket 41 Back Plate member 45 Bumper reinforcement 46 Hook bracket 47 Front plate member 50 Hook bracket 51 Back plate member 55 Bumper reinforcement 56 Front wall 57A, 57B Convex portion 58 Hook bracket 59 Front plate member 59a Bending portion 60 Hook bracket 61 Back plate member 65 Bumper reinforcement 66 Hook bracket 70 Hook bracket 71 Front plate member W1 welded part W2 welded part

Claims (3)

  A hook bracket for attaching a tow hook to a bumper reinforcement is fixed, and the hook bracket is provided at a front plate member that comes into contact with the front surface of the bumper reinforcement, and at a lower end of the front plate member, A back plate member that is in contact with the lower surface of the bumper reinforcement and a hook fixing member that protrudes downward from the back plate member and attaches the pulling hook are formed integrally, and at least the front plate member A hook for traction characterized by welding between an upper end portion and the front surface of the bumper reinforcement, and between a rear end portion of the back plate member and a lower end portion on the back side of the bumper reinforcement. Bracket mounting structure.   The bumper reinforcement is formed in a rectangular frame shape in cross section, and a horizontal rib is provided so as to cross between the front wall and the rear wall, and an upper end portion of the front plate member is formed by the horizontal rib. The attachment structure of the hook bracket for towing | pulling of Claim 1 welded to the front surface of the junction part with the said front wall. 3. The structure for attaching a tow hook bracket according to claim 1, wherein both side edges of the front plate member are welded to the bumper reinforcement.

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