JP2007069856A - Mounting structure of towing hook for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a towing hook for a vehicle capable of reducing a load transmission amount to a side member when load is inputted to the towing hook. <P>SOLUTION: A projecting part is provided on a back surface side of a hook bracket 13 and upper and lower surfaces 19, 21 of the projecting part are formed in a taper shape in which a vertical distance of the upper and lower surfaces 19, 21 is gradually reduced as it advances to a rear side of the vehicle in side view. Whereas, retaining surfaces 37, 39 arranged corresponding to the upper and lower surfaces 19, 21 of the hook bracket 13 are provided at the inside of a bumper reinforce 3 and the upper and lower surfaces 19, 21 of the hook bracket 13 are fitted to the retaining surfaces 19, 21 of the bumper reinforce 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mounting structure for a vehicle traction hook provided on a bumper reinforcement at a front end portion or a rear end portion of a vehicle.

  In general, a pair of left and right side members extending in the vehicle front-rear direction is disposed at the front portion of a vehicle such as an automobile, and the front end portions of the side members are connected by a bumper reinforcement extending in the vehicle width direction. . A bumper facer is attached to the bumper reinforcement, and the bumper is constituted by the bumper reinforcement and the bumper facer.

Further, a structure is known in which a bumper stay is provided at the front end of the side member, and a tow hook is attached to the bumper stay (see, for example, Patent Document 1).
JP 2003-2136 A

  However, in such a conventional mounting structure for a tow hook for a vehicle, when a load is input to the tow hook, the load is transmitted to the side member via the bumper stay. Therefore, since the input load to the side member becomes large, it is necessary to increase the rigidity of the side member, which causes a cost increase.

  Therefore, the present invention provides a mounting structure for a vehicle traction hook that can reduce the amount of load transmitted to a side member when a load is input to the traction hook.

  According to the vehicle pulling hook mounting structure of the present invention, a hook bracket is provided via a bumper reinforcement on a side member disposed at the front or rear of the vehicle, and the pulling hook is attached to the bumper rain via the hook bracket. A mounting structure of a tow hook for a vehicle to be attached to a force, wherein a protruding portion is provided on the back side of the hook bracket, and the side surfaces of the protruding portion face each other as they go inward in the vehicle front-rear direction in a side view. The bumper reinforcement is provided with a holding surface arranged corresponding to the side surface of the hook bracket, and the side surface of the hook bracket is held by the bumper reinforcement. The load is directed inward in the vehicle longitudinal direction from the tow hook to the hook bracket by being fitted to the surface. There are input, when the hook bracket is moved in the direction of transmission of the load, characterized by being configured to push the holding surface of the bumper reinforcement in the side surface of the hook bracket.

  According to the present invention, when a load is input to the tow hook, the hook bracket moves in the load transmission direction and pushes the holding surface of the bumper reinforcement on the side of the hook bracket.

  For this reason, the load can be efficiently absorbed by the hook bracket, and the amount of transmission to the side member can be greatly reduced.

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

  1 to 5 show a mounting structure for a vehicle traction hook according to an embodiment of the present invention. 1 is a perspective view showing a front bumper mounting structure, FIG. 2 is an enlarged cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is an enlarged cross-sectional view taken along line B-B in FIG. 1, and FIG. 5 is a cross-sectional view sequentially showing deformation around the hook bracket due to input of a load.

  The mounting structure for a vehicle traction hook according to the present embodiment can be applied to both a front bumper and a rear bumper. In the present embodiment, as illustrated in FIG. 1, an example of the structure for mounting a traction hook provided on a front bumper will be described. To do.

  As shown in FIG. 1, the front bumper 1 includes a bumper reinforcement 3 that serves as a skeleton member of the bumper and a bumper fascia 5 that covers the bumper reinforcement 3. The bumper reinforcement 3 includes left and right front side members 7. It is attached via a bumper stay 9 across the front end of the.

  The front side member 7 is formed in a closed cross section having a rectangular cross section and extends along the front-rear direction on both sides in the vehicle width direction of the front portion of the vehicle body.

  The bumper stays 9 are formed in a closed cross section having a rectangular cross section, and are provided at the front ends of the front side members 7, respectively.

  The bumper reinforcement 3 is formed in a closed cross section having a rectangular cross section, extends in the vehicle width direction, and both left and right ends thereof are coupled to the front end of the bumper stay 9. The pulling hook 11 is provided at the left end of the bumper reinforcement 3.

  As shown in FIG. 2, a hook bracket 13 for attaching the tow hook 11 is fitted inside the bumper reinforcement 3.

  As shown in FIGS. 2 and 3, a front wall 15 having a rectangular shape in front view extending in the vehicle width direction is provided on the front side of the hook bracket 13, and a protrusion extending rearward of the vehicle is provided on the back side of the front wall 15. A portion 17 is formed. The upper surface 19 and the lower surface 21 of the projecting portion 17 are inclined and arranged in a tapered shape in which the vertical distance gradually decreases in the side view as it goes toward the rear of the vehicle (inward in the vehicle front-rear direction). Further, on both the left and right sides of the projecting portion 17, support portions 23 made of a pair of left and right leg plates extending rearward of the vehicle are extended, and the support portions 23 extend to an inner wall 31 of a bumper reinforcement 3 described later. Yes.

  Furthermore, a screw hole 29 for attaching the traction hook 11 is formed in a substantially central portion of the front wall surface 15 of the hook bracket 13, and a root portion 27 of the traction hook 11 is screwed into the screw hole 29.

  On the other hand, as shown in FIG. 3, the bumper reinforcement 3 includes an outer wall 29 disposed on the front side of the vehicle, an inner wall 31 disposed behind the outer wall 29 and facing the outer wall 29, and The upper side wall 33 and the lower side wall 35 which connect the upper end and lower end of the outer side wall 29 and the inner side wall 31 back and forth are provided. The outer wall 29, the inner wall 31, the upper wall 33, and the lower wall 35 form the bumper reinforcement 3 in a closed cross-sectional shape, and the outer wall 29 and the inner wall 31 are a pair of upper and lower portions extending in the front-rear direction. The bumper reinforcement 3 is defined by three closed sections by the holding surfaces 37 and 39. The holding surface includes an upper holding surface 37 and a lower holding surface 39, and the vertical distance between the upper holding surface 37 and the lower holding surface 39 gradually increases toward the vehicle rear (inward in the vehicle front-rear direction). Thus, the holding surfaces 37 and 39 are formed in a so-called tapered shape.

  As shown in FIGS. 3 and 4, the outer wall 29 of the bumper reinforcement 3 is formed with an opening 43 sized to allow the support portion 23 and the protrusion 17 of the hook bracket 13 to be inserted. The opening 43 is disposed at a height position between the upper holding surface 37 and the lower holding surface 39.

  Further, as shown in FIG. 4, the length in the vehicle width direction of the front wall surface 15 of the hook bracket 13 is formed longer than the opening 43 of the bumper reinforcement 3, and the left and right end portions 15a of the front wall surface 15 are The bumper reinforcement 3 is disposed so as to abut the periphery of the opening of the outer wall 29 of the bumper reinforcement 3. An insertion hole 41 is formed in the inner wall 31 of the bumper reinforcement 3 at a portion where the rear end 17a of the protrusion 17 of the hook bracket 13 faces, and the size of the insertion hole 41 is the rear of the protrusion 17. It is formed slightly larger than the end 17a.

  As shown in FIGS. 1 and 4, a welded portion W is formed by welding to the outer wall 29 of the bumper reinforcement 3 over substantially the entire outer periphery of the front wall surface 15 of the hook bracket 13.

  A procedure for deforming the front end of the vehicle when a load having the above-described configuration is input will be described with reference to FIG.

  First, as shown in FIG. 5A, when a load F toward the rear of the vehicle is input to the hook bracket 13 fitted to the bumper reinforcement 3, as shown in FIG. The hook bracket 13 and the outer wall 29 of the bumper reinforcement 3 move to the rear of the vehicle. Here, since the insertion hole 41 is formed in the inner wall 31 of the bumper reinforcement 3, the rear end 17a of the protrusion 17 protrudes rearward from the insertion hole 41.

  Then, with respect to the upper holding surface 37 and the lower holding surface 39 of the bumper reinforcement 3 from the upper and lower surfaces 19 and 21 of the protrusion 17 of the hook bracket 13, the upper holding surface 37 and the lower holding surface 39 are moved up and down. A vertical load f in the direction of expanding acts. Therefore, the bumper reinforcement 3 is crushed so that the length in the front-rear direction is shortened, and the upper side wall 33 and the lower side wall 35 are deformed and moved upward and downward, respectively.

  And as shown in the figure (c), the hook bracket 13 moves further back, and the movement of the hook bracket 13 is complete | finished in a predetermined position.

  Next, the function and effect of this embodiment will be described.

  The protrusion 17 is provided on the back side of the hook bracket 13, and the distance between the upper and lower surfaces 19, 21 gradually decreases as the upper and lower surfaces 19, 21 of the protrusion 17 are directed inward in the vehicle front-rear direction in a side view. On the other hand, the bumper reinforcement 3 is formed in a tapered shape, and is held in a tapered shape corresponding to the upper and lower surfaces 19 and 21 of the hook bracket 13 toward the inside in the vehicle longitudinal direction in a side view. The surfaces 37 and 39 are provided, and the upper and lower surfaces 19 and 21 of the hook bracket 13 are fitted to the holding surfaces 37 and 39 of the bumper reinforcement 3. Therefore, when a load F directed inward in the vehicle front-rear direction is input from the tow hook 11 to the hook bracket 13 and the hook bracket 13 moves in the transmission direction of the load F, the protrusion 17 of the hook bracket 13 Since the upper and lower surfaces 19 and 21 push the holding surface of the bumper reinforcement 3 in the vertical direction, the load F can be efficiently absorbed by the bumper reinforcement 3.

  In addition, an opening 43 into which the protrusion 17 of the hook bracket 13 can be inserted is provided on the outer wall 29 disposed outside the bumper reinforcement 3 in the vehicle longitudinal direction, while the front side of the protrusion 17 of the hook bracket 13 is provided. A front wall 15 is provided on the front wall 15, and the protrusion 17 of the hook bracket 13 is fitted to the holding surfaces 37 and 39 of the bumper reinforcement 3 through the opening 43, and the periphery 15 a of the front wall 15 is opened to the opening of the outer wall 29. It is made to contact | abut to the part periphery.

  For this reason, the hook bracket 13 can be reliably held by the bumper reinforcement 3.

  Further, substantially the entire outer periphery of the front wall surface 15 of the hook bracket 13 is welded and fixed to the outer wall 29.

  For this reason, the hook bracket 13 is more securely held by the bumper reinforcement 3, and the hook bracket 13 is allowed to freely move back when the load F is input, thereby causing the bumper reinforcement 3 to be crushed and holding surfaces 37, 39. Therefore, the load F can be efficiently absorbed without being inhibited.

  An inner wall 31 is provided on the inner side (vehicle rear side) of the bumper reinforcement 3 in the vehicle front-rear direction so as to face the outer wall 29, and from the back side of the hook bracket 13 to the inner wall 31. Since the support portion 23 extending to the side is provided, a part of the load F can be absorbed by the support portion 23, and the amount of transmission of the load F to the side member can be reduced.

  In the above-described embodiment, the upper and lower surfaces 19 and 21 of the protrusion 23 of the hook bracket 13 are side surfaces, and the upper and lower surfaces 19 and 21 face each other as they go inward in the vehicle front-rear direction in a side view. It was formed in a taper shape in which the distance between the two sides 19 and 21 gradually decreased. However, instead of the upper and lower surfaces 19, 21, the left and right side wall portions of the projecting portion 23 are formed as side surfaces, and the distance between the left and right side wall portions facing each other gradually decreases toward the inside in the vehicle longitudinal direction. May be.

It is a perspective view which shows the attachment structure of the front bumper by embodiment of this invention. It is an expanded sectional view along the AA line in FIG. It is a perspective view which decomposes | disassembles and shows the principal part of the hook bracket and bumper reinforcement by embodiment of this invention. It is an expanded sectional view along the BB line in FIG. The deformation | transformation state of the hook bracket vicinity by the input of the collision load in embodiment of this invention is shown in order, and in this figure, (a) is the state before load input, (b) is the state during load input, (C) is sectional drawing which shows the state after deform | transforming with a load.

Explanation of symbols

3 Bumper Reinforce 7 Front Side Member (Side Member)
11 Tow hook 13 Hook bracket 17 Projection 19 Upper surface (side surface)
21 Bottom (side)
23 Protrusion 29 Outer wall 31 Inner wall 37 Upper holding surface (holding surface)
39 Lower holding surface (holding surface)
43 opening

Claims (4)

A vehicle traction hook mounting structure in which a hook bracket is provided on a side member disposed at the front or rear of a vehicle via a bumper reinforcement, and the traction hook is attached to the bumper reinforcement via the hook bracket. ,
Protruding portions are provided on the back side of the hook bracket, and the side surfaces of the protruding portions are formed in a tapered shape in which the distance between the facing side surfaces gradually decreases toward the inside in the vehicle front-rear direction in a side view,
By providing a holding surface arranged in correspondence with the side surface of the hook bracket inside the bumper reinforcement, and contacting the side surface of the hook bracket with the holding surface of the bumper reinforcement,
When a load directed inward in the vehicle longitudinal direction is input to the hook bracket, and the hook bracket moves in the direction of transmission of this load, the bumper reinforcement holding surface is pushed and spread on the side of the hook bracket. A mounting structure of a tow hook for a vehicle characterized by the above. While providing an opening in which the protruding portion of the hook bracket can be inserted on the outer wall arranged outside the vehicle front-rear direction of the bumper reinforcement,
A front wall surface is provided on the front side of the protrusion portion of the hook bracket, the protrusion portion of the hook bracket is fitted to the holding surface of the bumper reinforcement through the opening portion, and the peripheral edge of the front wall surface is set to the peripheral edge of the opening portion of the outer wall. 2. The mounting structure for a vehicle traction hook according to claim 1, wherein the structure is abutted.   The mounting structure for a vehicle traction hook according to claim 2, wherein substantially the entire outer periphery of the front wall surface of the hook bracket is fixed by welding to an outer wall of a bumper reinforcement. While providing an inner wall facing the outer wall on the inner side in the vehicle longitudinal direction of the bumper reinforcement,
The mounting structure for a traction hook for a vehicle according to any one of claims 1 to 3, further comprising a support portion that extends from the rear side of the front wall surface of the hook bracket to the inner wall.

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