JP2017177876A - Tow hook fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adequately disperse a load added to a tow hook thereby suppressing deformation and breakage of a bumper reinforcement.SOLUTION: A U-shaped fixture 20 is mounted so that an upper wall supported part 21, a front wall supported part 22 and a rear wall supported part 24 are supported by surface contact with an upper wall 11, a front wall 13 and a rear wall 14 of a bumper reinforcement 10 respectively, female screw parts 22a, 24a, which are engaged with a male screw part 42 of a tow hook 40, are formed on the front wall supported part 22 and the rear wall supported part 24 of the fixture 20. Thus, a load added to the tow hook 40 can be received by three faces of the upper wall 11, the front wall 13 and the rear wall 14 of the bumper reinforcement 10, and therefore, concentration of stress is avoided, and deformation and breakage of the bumper reinforcement 10 can be suppressed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a structure for attaching a tow hook.

  2. Description of the Related Art Conventionally, as a structure for attaching this type of traction hook, a structure in which a traction hook is detachably attached to a square cylindrical bumper reinforcement fixed to a side member via a bumper stay is known. For example, in Patent Document 1, a mounting body is formed by a hollow main body including a female threaded portion into which a male threaded portion of a tow hook is screwed, and a flange extending from the rear end of the main body, and the body of the mounting bracket is bumpered. There is disclosed a technique in which a rear wall is penetrated from a rear wall to a front wall, a front end of a main body is welded to a front wall of the bumper reinforcement, and a flange is fastened to the rear wall of the bumper reinforcement with a rivet. Cited Document 2 discloses an apparatus in which a female thread part into which a male thread part of a tow hook is screwed is provided on a projecting part projecting in the front-rear direction from a front wall and a rear wall of a bumper reinforcement. In Cited Document 3, an L-shaped attachment member provided with an internal thread portion that is engaged with an external thread portion formed at the tip of a tow hook is provided with a bumper stay support wall and a bumper that are superimposed on the rear wall of the bumper reinforcement. What is disposed on the upper wall of the reinforcement is disclosed.

JP 2005-271859 A Japanese Patent Laid-Open No. 2015-37917 JP 2008-7044 A

  However, in the technology described in Patent Document 1, the front end of the mounting bracket body is welded to the front wall of the bumper reinforcement, and when a load is applied to the towing hook during towing or loading, stress concentrates on the welded portion, and the bumper Reinforcement may be deformed or damaged. Moreover, in the technique of patent document 2, when bumper reinforcement is shape | molded by extrusion molding of an aluminum alloy, a thick protrusion part is formed over the full length of bumper reinforcement, and causes a weight increase. Furthermore, in the technique described in the cited document 3, although the load applied to the tow hook is received by two surfaces of the upper wall of the bumper reinforcement and the support wall of the stay, there is still room for improvement in order to effectively distribute the stress concentration. There is.

  The main object of the attachment structure of the tow hook of the present invention is to suppress the deformation and breakage of bumper reinforcement by appropriately distributing the load applied to the tow hook.

  In order to achieve the above-mentioned main object, the pulling hook mounting structure of the present invention adopts the following means.

The mounting structure of the tow hook of the present invention is
A tow hook mounting structure for attaching a tow hook to a square cylindrical bumper reinforcement extending in the vehicle width direction,
An attachment member that is fastened to the bumper reinforcement and to which the traction hook is detachably attached,
The mounting member is fastened to the bumper reinforcement in a state supported by at least three of the upper and lower surfaces and the front and rear surfaces of the bumper reinforcement.
This is the gist.

  In the tow hook attaching structure of the present invention, the attaching member to which the tow hook is detachably attached is supported on the bumper reinforcement in a state where it is supported on at least three surfaces of the upper and lower surfaces and the front and rear surfaces of the rectangular tubular bumper reinforcement. Conclude. Thereby, since the load added to a tow hook can be received by at least 3 surfaces of a bumper reinforcement, the load added to a tow hook can be disperse | distributed appropriately and the deformation | transformation and damage of a bumper reinforcement can be suppressed.

  In such a tow hook mounting structure of the present invention, the mounting member may be fastened to the bumper reinforcement in a state of being supported on at least the front surface, the upper surface, and the rear surface of the bumper reinforcement. If it carries out like this, the vehicle downward load added to a tow hook at the time of shipping can be appropriately disperse | distributed by 3 surfaces of bumper reinforcement.

  In the mounting structure of the tow hook according to the present invention in which the mounting member is supported on at least the front surface, the upper surface, and the rear surface of the bumper reinforcement, the mounting member is supported on the upper surface of the bumper reinforcement and the bumper reinforcement. A second member including a first member including a front surface supported portion supported on the front surface, a top surface supported portion supported on an upper surface of the bumper reinforcement, and a rear surface supported portion supported on a rear surface of the bumper reinforcement. The first member and the second member may be fastened to the upper surface of the bumper reinforcement in a state where the upper surface supported portions are overlapped with each other.

  Further, in the mounting structure of the tow hook according to the present invention in which the mounting member is supported on at least the front surface, the upper surface, and the rear surface of the bumper reinforcement, the bumper reinforcement has through holes formed on the same straight line on the front surface and the rear surface, respectively. The mounting member has a female threaded portion communicating with the through hole in each of a front supported portion supported on the front surface of the bumper reinforcement and a rear supported portion supported on the rear surface of the bumper reinforcement; The tow hooks are inserted into through holes formed in the front and rear surfaces of the bumper reinforcement, and screwed into female thread portions formed in the front supported portion and the rear supported portion of the mounting member, respectively. It can also have an external thread part. In this way, since the tow hook can be fixed to both the front supported part and the rear supported part of the mounting member, the load applied to the tow hook can be shared between the front supported part and the rear supported part. It is possible to suppress the stress concentration more effectively.

  Moreover, in the attachment structure of the tow hook of the present invention, a corner portion of the bumper reinforcement has a flange portion, and the attachment member has an abutting portion against which the flange portion of the bumper reinforcement is abutted. You can also. If it carries out like this, the load added to a tow hook can be received in the structurally advantageous location of bumper reinforcement, and the deformation | transformation and damage of bumper reinforcement can be suppressed more reliably.

It is the top view which looked at the state where the traction hook 40 was attached to the bumper reinforcement 10 using the attachment structure of the traction hook as one Example of this invention from the upper direction. It is an external appearance perspective view which shows the external appearance of the bumper reinforcement 10 and the fixture 20 of 1st Example. It is sectional drawing which shows the cross section of the fixture 20 of 1st Example. It is sectional drawing which shows the cross section of the fixture 20B of a modification. It is an external appearance perspective view which shows the external appearance of the fixture of a bumper reinforcement and 2nd Example. It is sectional drawing which shows the cross section of the fixture of 2nd Example. It is an external appearance perspective view which shows the external appearance of the fixture of a modification. It is sectional drawing which shows the cross section of the fixture of a modification.

  The form for implementing this invention is demonstrated using an Example.

[First embodiment]
FIG. 1 is a plan view of a state in which a tow hook is attached to a bumper reinforcement using the tow hook attaching structure as a first embodiment of the present invention, and FIG. 2 is an external view of the bumper reinforcement and the fixture. FIG. 3 is a cross-sectional view showing a cross section of the fixture (cross section AA in FIG. 1).

  As illustrated, the bumper reinforcement 10 is an elongated member having a rectangular tube shape having an upper wall 11, a lower wall 12, a front wall 13, and a rear wall 14, and adjacent surfaces are orthogonal to each other. It is comprised by giving a bending process to the both ends of the cylindrical body formed by extrusion molding. The bumper reinforcement 10 is attached via a stay 2 to a pair of left and right side members 1 installed in the vehicle width direction of the vehicle body with the longitudinal direction as the vehicle width direction.

  A reinforcing rib 15 extending in parallel with the upper wall 11 and the lower wall 12 is formed between the upper wall 11 and the lower wall 12 of the bumper reinforcement 10. Further, the front wall 13 and the rear wall 14 are formed with reinforcing flange portions 13 a and 14 a whose upper ends extend upward from the upper wall 11. The collar portions 13a and 14a may be omitted. Further, the front wall 13 and the rear wall 14 are formed with through holes 13b and 14b that pass through the same straight line in the vehicle longitudinal direction.

  The bumper reinforcement 10 is detachably attached to the tow hook 40 via the attachment 20. The tow hook 40 is formed with a ring portion 41 to which a rope is attached at one end during towing and shipping, and a male screw portion 42 at the other end.

  The fixture 20 has a U-shape having an upper wall supported portion 21, and a front wall supported portion 22 and a rear wall supported portion 24 respectively extending in the orthogonal direction from both ends of the upper wall supported portion 21. It is a member and is mounted so as to straddle the upper wall 11 of the bumper reinforcement 10, and the upper wall supported part 21, the front wall supported part 22, and the rear wall supported part 24 are respectively the upper wall 11 of the bumper reinforcement 10. The front wall 13 and the rear wall 14 are supported by surface contact.

  The fixture 20 has a rivet hole 21 a formed at the center of the upper wall supported portion 21, and is fastened to the upper wall 11 of the bumper reinforcement 10 by a rivet 28. Further, abutting grooves 21b and 21c extending along the wall surfaces of the front wall supported portion 22 and the rear wall supported portion 24 are formed at both ends of the inner surface of the upper wall supported portion 21, respectively. The fitting 20 includes a flange portion of the front wall 13 and the rear wall 14 of the bumper reinforcement 10 in the abutting grooves 21b and 21c, while the central portion of the inner surface of the upper wall supported portion 21 is in surface contact with the upper wall 11 of the bumper reinforcement 10. It is fastened and fixed to the bumper reinforcement 10 in a state where 13a and 14a are abutted.

  The front wall supported portion 22 of the fixture 20 is formed thicker than the upper wall supported portion 21, and a female screw portion 22 a communicating with the through hole 13 b of the front wall 13 of the bumper reinforcement 10 is formed. The rear wall supported portion 24 is formed thick like the front wall supported portion 22, and a female screw portion 24 a communicating with the through hole 14 b of the rear wall 14 of the bumper reinforcement 10 is formed. Accordingly, the female screw portions 22a, 24a and the through holes 13b, 14b are in communication with each other on the same straight line, and are screwed into the female screw portions 22a, 24a while inserting the male screw portion 42 of the traction hook 40 into the through holes 13b, 14b. Thus, the tow hook 40 can be attached to the bumper reinforcement 10 (attachment tool 20).

  The tow hook mounting structure of the first embodiment described above has a U-shaped fixture 20 with an upper wall supported portion 21, a front wall supported portion 22, and a rear wall supported portion 24 mounted on the bumper reinforcement 10, respectively. The female screw portions 22a and 24a that are attached to the wall 11, the front wall 13, and the rear wall 14 so as to be supported by surface contact and are screwed into the male screw portion 42 of the tow hook 40 are connected to the front wall supported portion of the fixture 20. 22, formed on the rear wall supported portion 24. As a result, the load applied to the tow hook 40 can be received by the three surfaces of the upper wall 11, the front wall 13 and the rear wall 14 of the bumper reinforcement 10, so that stress concentration is avoided and the deformation and breakage of the bumper reinforcement 10 are avoided. Can be suppressed.

  Further, in the first embodiment, the pulling hook mounting structure is such that the male threaded portion 42 of the pulling hook 40 is screwed into the front wall supported portion 22 and the rear wall supported portion 24 of the U-shaped mounting tool 20. Since the female screw portions 22a and 24a are formed, the load applied to the pulling hook 40 can be shared by the front wall supported portion 22 and the rear wall supported portion 24, and the deformation and breakage of the bumper reinforcement 10 can be more reliably suppressed. can do.

  Furthermore, the structure for attaching the tow hook according to the first embodiment is formed with abutting grooves 21b and 21c at both end portions of the inner surface of the upper wall supported portion 21 of the fixture 20, and the inner surface central portion of the upper wall supported portion 21 is formed. While making the surface contact with the upper wall 11 of the bumper reinforcement 10, the flange portions 13 a and 14 a of the front wall 13 and the rear wall 14 of the bumper reinforcement 10 are abutted against the abutting grooves 21 b and 21 c. Thereby, the load applied to the tow hook 40 can be received at a structurally advantageous portion of the bumper reinforcement 10, and deformation and breakage of the bumper reinforcement 10 can be further reliably suppressed.

  In the first embodiment, the female threaded portions 22a and 24a into which the male threaded portion 42 of the traction hook 40 is screwed are formed at two locations of the front wall supported portion 22 and the rear wall supported portion 24 of the fixture 20, but FIG. As shown in the attachment 20B of the modified example, the female screw portion 22a may be formed only on the front wall supported portion 22. Even in this case, the load applied to the tow hook 40 can be received by the three surfaces of the bumper reinforcement 10, and deformation and breakage of the bumper reinforcement 10 can be suppressed. In this case, the rear wall supported portion 24B may not have a thick portion as shown in FIG.

[Second Embodiment]
In the first embodiment, the fixture 20 is formed in a U-shape by one member, but in the second embodiment, the fixture is formed by two members. FIG. 5 is an external perspective view showing the appearance of the bumper reinforcement and the fixture of the second embodiment, and FIG. 6 is a cross-sectional view showing the cross section of the fixture of the second embodiment. The fixture of the second embodiment is composed of L-shaped first and second members 120 and 130. The first member 120 includes an upper wall supported portion 121 and a front wall supported portion 122 extending in an orthogonal direction from one end of the upper wall supported portion 121, and the second member 130 includes an upper wall supported portion 121. It has the support part 131 and the rear wall supported part 132 extended from the end of the upper wall supported part 131 in the orthogonal direction. In the first and second members 120 and 130, circular rivet holes 121a and 131a are formed in the upper wall supported portions 121 and 131, respectively, and the front wall supported portion 122 and the rear wall supported portion 132 are outward. The upper wall supported portions 121 and 131 are overlapped with each other toward the upper wall 11 of the bumper reinforcement 10 by a rivet 28. Further, the front wall supported portion 122 and the rear wall supported portion 132 of the first and second members 120 and 130 are formed thicker than the upper wall supported portions 121 and 131, respectively, and the through hole of the bumper reinforcement 10 is formed. Female screw portions 122a and 132a are formed through which the male screw portion 42 of the traction hook 40 is screwed. Also in the fixture according to the second embodiment, since the load applied to the pulling hook 40 can be received by the three surfaces of the bumper reinforcement 10, deformation and breakage of the bumper reinforcement 10 can be suppressed.

  In the second embodiment, the rivet holes 121b and 131b of the upper wall supported portions 121 and 131 are formed in a circular shape. However, as shown in the first and second members 120B and 130B of the modified example of FIG. The rivet holes 121b and 131b of the support parts 121 and 131 may be formed by long holes whose longitudinal direction is the longitudinal direction of the bumper reinforcement 10. In this way, even if the first and second members 120B and 130B have slight variations in size, the front wall supported portion 122 of the first member 120B and the rear wall supported of the second member 130B are more reliably provided. The portion 132 can be brought into surface contact with the front wall 13 and the rear wall 14 of the bumper reinforcement 10.

  In the second embodiment, the substantially L-shaped first and second members 120 and 130 constitute a fixture that makes surface contact with the three surfaces of the upper wall 11, the front wall 13, and the rear wall 14 of the bumper reinforcement 10. However, the present invention is not limited to this. For example, as shown in the first and second members 120C and 130C of the modification of FIG. 8, the upper wall 11 of the bumper reinforcement 10 is formed by two substantially U-shaped members. A fixture that makes surface contact with four surfaces of the lower wall 12, the front wall 13, and the rear wall 14 may be configured. That is, the fixture may be configured so as to be in surface contact with at least three surfaces of the bumper reinforcement 10.

  In the first embodiment and the second embodiment, the fixture is brought into direct contact with the walls (the upper wall 11, the front wall 13, and the rear wall 14) of the bumper reinforcement 10; A support plate may be interposed therebetween.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of traction hooks and their attachments.

  1 Side member, 2 stays, 10 bumper reinforcement, 11 upper wall, 12 lower wall, 13 front wall, 13a collar part, 13b through hole, 14 rear wall, 14a collar part, 14b through hole, 15 rib, 20, 20B 21, upper wall supported portion, 21a rivet hole, 21b, 21c abutment groove, 22 front wall supported portion, 22a female threaded portion, 24, 24B rear wall supported portion, 24a female threaded portion, 40 pulling hook, 41 ring Part, 42 male thread part, 120, 120B, 120C first member, 121 upper wall supported part, 121a, 121b rivet hole, 122, 122C front wall supported part, 122a female thread part, 130, 130B, 130C second member, 131 Upper wall supported portion, 131a, 131b Rivet hole, 132, 132C Rear wall supported portion, 132a, 13 2b Female thread part.

Claims (5)

A tow hook mounting structure for attaching a tow hook to a square cylindrical bumper reinforcement extending in the vehicle width direction,
An attachment member that is fastened to the bumper reinforcement and to which the traction hook is detachably attached,
The mounting member is fastened to the bumper reinforcement in a state supported by at least three of the upper and lower surfaces and the front and rear surfaces of the bumper reinforcement.
Towing hook mounting structure. The tow hook mounting structure according to claim 1,
The mounting member is fastened to the bumper reinforcement in a state of being supported on at least a front surface, an upper surface, and a rear surface of the bumper reinforcement.
Towing hook mounting structure. The tow hook mounting structure according to claim 2,
The mounting member includes a first member including an upper surface supported portion supported on the upper surface of the bumper reinforcement and a front supported portion supported on the front surface of the bumper reinforcement, and an upper surface supported on the upper surface of the bumper reinforcement. A second member including a supported portion and a rear supported portion supported on the rear surface of the bumper reinforcement;
The first member and the second member are fastened to the upper surface of the bumper reinforcement in a state where respective upper surface supported portions are overlapped,
Towing hook mounting structure. A tow hook mounting structure according to claim 2 or 3,
The bumper reinforcement has through holes formed on the same straight line on the front surface and the rear surface,
The mounting member has a female thread portion communicating with the through hole in each of a front supported portion supported on the front surface of the bumper reinforcement and a rear supported portion supported on the rear surface of the bumper reinforcement,
The tow hooks are inserted into through holes formed in the front and rear surfaces of the bumper reinforcement, and screwed into female thread portions formed in the front supported portion and the rear supported portion of the mounting member, respectively. Having a male thread,
Towing hook mounting structure. A tow hook mounting structure according to any one of claims 1 to 4,
The corner part of the bumper reinforcement has a collar part,
The attachment member has an abutment portion against which a flange portion of the bumper reinforcement is abutted.