JP4099897B2 - Tow hook structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tow hook structure that is attached to a front end or a rear end of a vehicle side member.
[0002]
[Prior art]
Conventionally, this type of tow hook structure is shown in FIG. In the figure, reference numeral 30 denotes a rear side member that is a side member extending in the longitudinal direction of the vehicle body at the left and right sides of the vehicle body, and includes a rear side member main body 32 and a rear side extension 34 joined to a rear end portion of the rear side member main body 32. Composed. The rear side extension 34 is crushed in the axial direction and absorbs energy in the event of a rear collision, and therefore has a lower strength than the rear side member main body 32.
[0003]
A traction hook 36 is attached to the rear side extension 34 by welding. The traction hook 36 extends below the rear side member 30, and a hook engagement hole 36 a is formed at a position below the rear side member 30. Yes.
[0004]
At the time of towing, a moment proportional to the distance from the rear side extension 34 to the engagement hole 36a of the towing hook 36 acts on the attachment portion of the towing hook 36 to the rear side extension 34, and the acting moment increases as this distance increases. Therefore, it is necessary to increase the attachment strength of the tow hook 36.
[0005]
[Problems to be solved by the invention]
However, in such a conventional configuration, in order to increase the attachment strength of the traction hook 36, the attachment length L in the front-rear direction of the attachment portion of the traction hook 36 to the rear side extension 34 may be increased (indicated by phantom lines). On the other hand, if the attachment length L is increased, the strength of the rear side extension 34 to which the tow hook 36 is attached is increased, so that there is a problem that the rear side extension 34 cannot be sufficiently crushed at the time of a rear collision. It is difficult to reconcile these two problems.
[0006]
The present invention has been made in view of such a problem, and provides a traction hook structure that can sufficiently secure traction strength and can sufficiently absorb collision energy by a non-strength portion of a side member at the time of collision. Objective.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is provided with side members extending in the longitudinal direction of the vehicle body at the left and right side portions of the vehicle body,
The side member is composed of a high-strength strength portion, and a non-strength portion that is connected to the end portion of the strength portion in the vehicle longitudinal direction and has a lower strength than the strength portion,
In the tow hook structure in which a tow hook extending below the side member is attached to the non-strength part of the side member, and the hook engaging hole is formed in the tow hook at a position below the side member,
A reinforcing member is installed near the hook engaging hole of the tow hook or below the hook engaging hole and the strength part of the side member, and deformed when the non-strength part is crushed in the middle part of the reinforcing member There are possible vulnerable parts ,
The weak portion is a bead, and the protruding ridge of the bead extends at an angle with respect to the longitudinal direction of the reinforcing member, and the protruding ridge of the bead protrudes in a direction away from the side member. .
[0008]
The invention according to claim 2 is provided with side members extending in the longitudinal direction of the vehicle body on the left and right side portions of the vehicle body,
The side member is composed of a high-strength strength portion, and a non-strength portion that is connected to the end portion of the strength portion in the vehicle longitudinal direction and has a lower strength than the strength portion,
In the tow hook structure in which a tow hook extending below the side member is attached to the non-strength part of the side member, and the hook engaging hole is formed in the tow hook at a position below the side member,
A reinforcing member is installed near the hook engaging hole of the tow hook or below the hook engaging hole and the strength part of the side member, and deformed when the non-strength part is crushed in the middle part of the reinforcing member There are possible vulnerable parts,
The weak part is a bead, and a protruding ridge of the bead extends at an angle with respect to a longitudinal direction of the reinforcing member and a direction perpendicular to the longitudinal direction .
[0009]
The invention according to claim 3 is provided with side members extending in the longitudinal direction of the vehicle body on the left and right side portions of the vehicle body,
The side member is composed of a high-strength strength portion, and a non-strength portion that is connected to the end portion of the strength portion in the vehicle longitudinal direction and has a lower strength than the strength portion,
In the tow hook structure in which a tow hook extending below the side member is attached to the non-strength part of the side member, and the hook engaging hole is formed in the tow hook at a position below the side member,
A reinforcing member is constructed near the hook engaging hole of the tow hook or below the hook engaging hole and the strength portion of the side member, and a weak portion is provided in the middle of the reinforcing member.
The weak part is a bead, and the protruding ridge of the bead extends at an angle with respect to the longitudinal direction of the reinforcing member, and the bead width at the lower edge of the bead measured along the longitudinal direction of the reinforcing member is It is characterized by being shorter than the bead width at the upper edge .
[0010]
According to a fourth aspect of the present invention, when viewed in a cross section perpendicular to the protruding ridge of the bead according to any one of the first to third aspects, the radius of curvature or the protruding angle at the protruding peak of the bead is protruding. It is characterized by being smaller than the radius of curvature or standing angle at the foot of the mountain.
[0011]
According to a fifth aspect of the invention, the projecting ridge of the bead according to any one of claims 1 to 4, characterized in that the extending direction substantially parallel to the vertical direction of the vehicle body.
[0013]
The reinforcing member may be an integral part of the side member or the traction hook, but the invention according to claim 6 is characterized in that the reinforcing member according to any one of claims 1 to 5 is the side member and the traction hook. It is a separate part, and both ends of the reinforcing member are respectively fixed to the side member and the traction hook by fastening means.
[0014]
According to a seventh aspect of the present invention, the reinforcing member according to any one of the first to sixth aspects is provided between the tow hook and a portion of the strength portion of the side member closest to the non-strength portion. It is characterized by.
[0015]
【The invention's effect】
According to the first aspect of the present invention, at the time of traction, the traction force is distributed to the strength portion of the side member by the reinforcing member that connects the strength portion of the side member and the traction hook. For this reason, the limit strength of traction can be increased and the traction performance can be improved. Therefore, it is not necessary to excessively lengthen the attachment length between the tow hook and the non-reinforcing portion of the side member, and a large allowance for the non-strength portion to be crushed during a collision can be ensured. Further, at the time of collision, since the weak part is provided in the middle part of the reinforcing member, the reinforcing member is deformed by using the weak part as a trigger, so that the non-strength part of the side member is not prevented from being crushed. The collision energy can be absorbed by both the portion and the reinforcing member. Thus, it is possible to achieve both improvement in traction strength and maintenance of collision energy absorption performance. By making the weak part of the reinforcing member a bead and extending the protruding ridge of the bead at an angle with respect to the longitudinal direction of the reinforcing member, the reinforcing member is reliably deformed with the bead as a trigger without stretching the reinforcing member at the time of collision. be able to. Deformation can be easily controlled by tuning the arrangement, angle, bead width, and the like of the protruding ridge of the bead by using the weakened portion as a bead. Further, by projecting the protruding ridge of the bead away from the side member, the direction in which the bead is crushed and displaced at the time of collision can be controlled to be away from the side member. Thereby, at the time of a collision, the situation where the reinforcement member does not contact the side member and hinders the progress of the crushing of the non-strength portion of the side member can be prevented.
[0016]
According to the second aspect of the present invention, at the time of towing, the traction force is distributed to the strength portion of the side member by the reinforcing member that connects the strength portion of the side member and the traction hook. For this reason, the limit strength of traction can be increased and the traction performance can be improved. Therefore, it is not necessary to excessively lengthen the attachment length between the tow hook and the non-reinforcing portion of the side member, and a large allowance for the non-strength portion to be crushed during a collision can be ensured. Further, at the time of collision, since the weak part is provided in the middle part of the reinforcing member, the reinforcing member is deformed by using the weak part as a trigger, so that the non-strength part of the side member is not prevented from being crushed. The collision energy can be absorbed by both the portion and the reinforcing member. Thus, it is possible to achieve both improvement in traction strength and maintenance of collision energy absorption performance. By making the weak part of the reinforcing member a bead and extending the protruding ridge of the bead at an angle with respect to the longitudinal direction of the reinforcing member, the reinforcing member is reliably deformed with the bead as a trigger without stretching the reinforcing member at the time of collision. be able to. Deformation can be easily controlled by tuning the arrangement, angle, bead width, and the like of the protruding ridge of the bead by using the weakened portion as a bead. Further, during towing, deformation such as elongation caused by the bead is less likely to occur in the reinforcing member, and the towing performance can be improved.
[0017]
According to the third aspect of the present invention, during traction, the traction force is distributed to the strength portion of the side member by the reinforcing member that connects the strength portion of the side member and the traction hook. For this reason, the limit strength of traction can be increased and the traction performance can be improved. Therefore, it is not necessary to excessively lengthen the attachment length between the tow hook and the non-reinforcing portion of the side member, and a large allowance for the non-strength portion to be crushed during a collision can be ensured. Further, at the time of collision, since the weak part is provided in the middle part of the reinforcing member, the reinforcing member is deformed by using the weak part as a trigger, so that the non-strength part of the side member is not prevented from being crushed. The collision energy can be absorbed by both the portion and the reinforcing member. Thus, it is possible to achieve both improvement in traction strength and maintenance of collision energy absorption performance. By making the weak part of the reinforcing member a bead and extending the protruding ridge of the bead at an angle with respect to the longitudinal direction of the reinforcing member, the reinforcing member is reliably deformed with the bead as a trigger without stretching the reinforcing member at the time of collision. be able to. Deformation can be easily controlled by tuning the arrangement, angle, bead width, and the like of the protruding ridge of the bead by using the weakened portion as a bead. Also, when pulling, a tensile force larger than the upper edge acts on the lower edge of the reinforcing member, but when measured along the longitudinal direction of the reinforcing member, the bead width at the lower edge of the bead is larger than the bead width at the upper edge of the bead. By shortening the length, it becomes difficult for deformation such as elongation caused by the bead to occur in the reinforcing member during towing, and the towing strength can be improved. During a collision, the upper edge of the bead is greatly deformed than the lower edge, in order to displace downward in the bead, you can be displaced in a direction that does not close the reinforcing member to the side members as a whole a reinforcing member, a non-intensity of the side member It is possible to prevent a situation in which the progress of crushing of the part is inhibited.
[0018]
According to invention of Claim 4, in addition to the effect of any one of Claims 1 thru | or 3 , by making the protruding peak part of a bead sharper than a protruding peak part, at the time of a collision, a protruding peak By crushing the part, it is possible to displace the projecting mountain top in a direction in which it protrudes more, and it is possible to control the direction in which it is displaced more reliably away from the side member.
[0019]
According to the invention of claim 5, wherein, in addition to the effect according to any one of claims 1 to 4, longitudinal tensile force acts on the reinforcing member during towing, the vehicle body vertical protruding ridge bead By extending in a direction substantially parallel to the direction, the protruding ridge of the bead can be angled with respect to this tensile force. Therefore, during towing, deformation such as elongation caused by a bead is less likely to occur in the reinforcing member, and towing performance can be improved. Moreover, at the time of a collision, this bead can be used as a trigger to cause deformation.
[0021]
According to the invention described in claim 6 , by using the reinforcing member as a separate part from the side member and the tow hook, the conventional side member and the tow hook can be shared, and it is not necessary to make a large design change. . In addition, when the reinforcing member is deformed, it is possible to replace only the reinforcing member.
[0022]
According to the seventh aspect of the present invention, the reinforcing member is installed between the pulling hook and the portion closest to the non-strength portion of the strength portion of the side member, thereby effectively increasing the pulling strength with a short reinforcing member. Can be improved.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
1 to 3 are views showing a first embodiment of the present invention. In the figure, reference numeral 10 denotes a rear side member which is a side member extending in the longitudinal direction of the vehicle body at both left and right side portions of the vehicle body. Reference numeral 10 denotes a rear side member main body 12 having a reverse-hat-shaped cross section that is a high strength portion and a rear end side of the rear side member main body 12, and the plate thickness is thinner and the strength is weaker than the rear side member main body 12. And a rear side extension 14 having a reverse hat shape in cross section, which is a non-strength portion. The front end of the rear side extension 14 is joined by spot welding at the rear end portion of the rear side member main body 12, and the rear end of the rear side extension 14 is joined to the rear panel 26 by spot welding. A bumper fascia 28 is disposed behind the rear panel 26.
[0025]
At the rear end portion of the rear side extension 14, traction hooks 16 each composed of two brackets (see FIG. 3) are attached to the side surface and the bottom surface of the rear side extension 14 by spot welding. The tow hook 16 extends below the rear side member 10, and a hook engaging hole 16 a is formed at a position below the rear side member 10.
[0026]
A reinforcing member 20 is provided between the vicinity of the hook engaging hole 16a of the tow hook 16 and the joint portion between the rear side member main body 12 and the rear side extension 14, which is the portion closest to the rear side extension 14 of the rear side member main body 12. It is erected. The reinforcing member 20 can be integrated with the traction hook 16 and the rear side member 10, but if they are separate parts as in this embodiment, the traction hook 16 and the rear side member 10 can be shared with conventional products. When the reinforcing member 20 is deformed due to interference or the like, it is convenient that only the reinforcing member 20 can be replaced. The reinforcing member 20 is fastened to the rear side member main body 12 and the traction hook 16 by bolts and nuts 21, respectively.
[0027]
A bead 22 that is a fragile portion is provided in an intermediate portion of the reinforcing member 20. The protruding ridge 22 a of the bead 22 extends in a direction substantially parallel to the vertical direction of the vehicle body, and protrudes in a direction away from the rear side member 10. As shown in an enlarged view in FIG. 2, when viewed in a cross section orthogonal to the protruding ridge 22a of the bead 22, the protruding angle θ1 at the protruding peak 22b of the bead 22 is larger than the standing angle θ2 at the protruding mountain 22c. It is getting smaller. In addition, as shown in FIG. 4, when the protrusion peak part 22b and the protrusion peak part 22c are curvilinear, and the angle cannot be defined, the curvature radius r1 of the protrusion peak part 22b is the protrusion peak. It may be set to be smaller than the radius of curvature r2 of the portion 22c, and in any case, the protruding mountain top portion 22b is sharper than the protruding ridge portion 22c.
[0028]
In the tow hook structure configured as described above, at the time of towing, the towing force input from the hook engaging hole 16a is transmitted to the rear side member main body 12 by the reinforcing member 20 and dispersed, thereby increasing the limit strength. Can do. Immediately after the action of the traction force, the bead 22 of the reinforcing member 20 is pulled and the reinforcing member 20 is slightly extended. This degree of extension is within the elastic deformation range of the entire vicinity of the traction hook 16 including the rear side extension 14. And no residual stress remains. Since the protruding ridge 22a of the bead 22 is substantially parallel to the vertical direction of the vehicle body and has an angle with respect to the direction perpendicular to the longitudinal direction of the reinforcing member 20, this elongation can be minimized.
[0029]
At the time of a rear collision, the rear side extension 14 is crushed in the axial direction, and the reinforcing member 20 is deformed by using the bead 22 as a trigger. Can be absorbed. The bead 22 protrudes in a direction in which the protruding ridge 22a moves away from the rear side member 10, and is biased so as to be displaced in a direction in which the protruding ridge 22a further protrudes when deformed. Sometimes, the reinforcing member 20 does not come into contact with the rear side extension 14, and a situation in which the progress of crushing of the rear side extension 14 is inhibited can be prevented. In particular, since θ1 <θ2, the projecting peak 22b of the projecting ridge 22a is crushed, and the projecting ridge 22a can be controlled to be displaced in a projecting direction more reliably during deformation.
[0030]
5 and 6 are diagrams showing a second embodiment of the present invention. The same members and parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0031]
The bead 24 of the reinforcing member 20 of this embodiment is such that the bead width 24a at the lower edge of the bead 24 measured along the longitudinal direction of the reinforcing member 20 is shorter than the bead width 24b at the upper edge of the bead 24. In other words, it is set so that the length of the bead 24 on the inclined surface portion gradually decreases as it goes downward.
[0032]
At the time of towing, a tensile force larger than that of the upper edge acts on the lower edge of the reinforcing member 20. Therefore, by making the bead width 24 a at the lower edge of the bead shorter than the bead width 24 b at the upper edge of the bead, Immediately after the traction force is applied, deformation such as elongation caused by the bead is less likely to occur in the reinforcing member, and traction performance can be improved. At the time of a rear collision, the upper edge of the bead 24 is deformed to be larger than the lower edge, and the entire reinforcing member is displaced downward in the bead 24 (shown by phantom lines in FIG. 5), so that the reinforcing member 20 approaches the rear side extension 14. Therefore, it is possible to prevent the rear side extension 14 from being crushed.
[0033]
The deformation of the reinforcing member 20 at the time of the rear collision can be easily controlled by providing the beads as described above and tuning the arrangement, angle, and bead width of the protruding ridges of the beads. In addition to the examples of the beads 22 and 24, for example, the inclination of the beads can be changed, or the ratio of the bead width to the total length of the reinforcing member 20 can be changed. The traction strength can be improved by reducing the slope or reducing the ratio of the bead width to the total length of the reinforcing member 20. However, instead of providing a bead as the fragile portion, a notch or an opening may be provided in the intermediate portion of the reinforcing member 20.
[0034]
In the above embodiment, the end portion of the reinforcing member 20 on the side of the traction hook 16 is provided in the vicinity of the hook engagement hole 16a of the traction hook 16, but the present invention is not limited to this, and the traction hook 16 of the reinforcement member 20 is provided. The side end portion may be positioned below the hook engaging hole 16a. Thereby, not only can the influence of the extension of the beads 22 and 24 immediately after the action of the traction force be reduced, but also the distance between the attachment point of the traction hook 16 to the rear side extension 14 and the end of the reinforcement member 20 on the traction hook 16 side. Therefore, the tensile force acting on the reinforcing member 20 can be reduced, which is more advantageous for traction. Further, by positioning the end of the reinforcing member 20 on the rear side member main body 12 side closest to the rear side extension 14, the traction strength can be effectively improved with the short reinforcing member 20.
[0035]
Moreover, although the case where it applied to the rear side member as a side member was demonstrated in the said embodiment, it can apply similarly to a front side member. The strength member and the non-strength portion of the side member are not limited to being configured as separate members, and the side member that is an integral part is provided with a strength portion in which the reinforcement is provided and the strength is increased, and the strength portion. It is good also as comprising from the non-strength part in which the intensity | strength was lower than the intensity | strength part, without being provided with reinforcement in the vehicle body front-back direction edge part side.
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment of a tow hook structure of the present invention.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is a perspective view of FIG. 1;
4 is a cross-sectional view illustrating another example of the bead in FIG. 1. FIG.
FIG. 5 is a side view showing a second embodiment of the present invention.
6 is a perspective view of the reinforcing member of FIG. 5. FIG.
FIG. 7 is a side view showing a conventional tow hook structure.
[Explanation of symbols]
10 Rear side member (side member)
12 Rear side member body (strength part)
14 Rear side extension (non-strength part)
16 Towing hook 16a Hook engagement hole 20 Reinforcing member 22 Bead 22a Protruding ridge 22b Protruding mountain peak portion 22c Protruding mountain foot portion 24 Bead 24a Bead width 24b Bead width

Claims (7)

Side members that extend in the longitudinal direction of the vehicle body are arranged on the left and right sides of the vehicle body,
The side member is composed of a high-strength strength portion, and a non-strength portion that is connected to the end portion of the strength portion in the vehicle longitudinal direction and has a lower strength than the strength portion.
In the tow hook structure in which a tow hook extending below the side member is attached to the non-strength part of the side member, and the hook engaging hole is formed in the tow hook at a position below the side member,
A reinforcing member is installed near the hook engaging hole of the tow hook or below the hook engaging hole and the strength part of the side member, and deformed when the non-strength part is crushed in the middle part of the reinforcing member There are possible vulnerable parts ,
The weak portion is a bead, and the protruding ridge of the bead extends at an angle with respect to the longitudinal direction of the reinforcing member, and the protruding ridge of the bead protrudes in a direction away from the side member. Tow hook structure. Side members that extend in the longitudinal direction of the vehicle body are arranged on the left and right sides of the vehicle body,
The side member is composed of a high-strength strength portion, and a non-strength portion that is connected to the end portion of the strength portion in the vehicle longitudinal direction and has a lower strength than the strength portion.
In the tow hook structure in which a tow hook extending below the side member is attached to the non-strength part of the side member, and the hook engaging hole is formed in the tow hook at a position below the side member,
A reinforcing member is installed near the hook engaging hole of the tow hook or below the hook engaging hole and the strength part of the side member, and deformed when the non-strength part is crushed in the middle part of the reinforcing member There are possible vulnerable parts,
The fragile portion is a bead, and the protruding ridge of the bead extends at an angle with respect to a longitudinal direction of the reinforcing member and a direction orthogonal to the longitudinal direction . Side members that extend in the longitudinal direction of the vehicle body are arranged on the left and right sides of the vehicle body,
The side member is composed of a high-strength strength portion, and a non-strength portion that is connected to the end portion of the strength portion in the vehicle longitudinal direction and has a lower strength than the strength portion.
In the tow hook structure in which a tow hook extending below the side member is attached to the non-strength part of the side member, and the hook engaging hole is formed in the tow hook at a position below the side member,
A reinforcing member is constructed near the hook engaging hole of the tow hook or below the hook engaging hole and the strength portion of the side member, and a weak portion is provided in the middle of the reinforcing member.
The weak part is a bead, and the protruding ridge of the bead extends at an angle with respect to the longitudinal direction of the reinforcing member, and the bead width at the lower edge of the bead measured along the longitudinal direction of the reinforcing member is A tow hook structure characterized in that it is shorter than the bead width at the upper edge . Viewed in cross section perpendicular to the protruding ridges of the bead, towards the radius of curvature or protruding angle in the projecting crest of the bead, they claim 1, characterized in that less than the radius of curvature or upright angle in the projecting foot portion 3 The tow hook structure according to any one of the above. The tow hook structure according to any one of claims 1 to 4, wherein the protruding ridge of the bead extends in a direction substantially parallel to a vertical direction of the vehicle body. Reinforcement member and the side members and tow hook is a separate component, any one of claims 1 to 5, characterized in that both end portions of the reinforcing member is fixed by the respective fastening means to the side members and tow hook Tow hook structure as described in. The tow hook structure according to any one of claims 1 to 6, wherein the reinforcing member is installed between the tow hook and a portion of the side member closest to the non- strength portion of the strength portion .

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