JPH0326005Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an automobile hook used for towing a vehicle or for securing a vehicle when transporting the vehicle.

(Prior art and its problems) Automobile hooks are used for towing vehicles,
It is provided for securing vehicles during transportation, and is made of metal rods or thick plates, and generally has side frames attached to the front and rear of the vehicle.

On the other hand, the side frame is connected to the underbody and serves to prevent the vehicle from bending or twisting in the front, rear, left or right directions. The tip of this side frame has a structure that prevents it from collapsing against force in the compression direction.
When a large impact is applied during a car collision, the tip of the side frame collapses while generating drag, absorbing the impact energy and ensuring a survival space for the driver and passengers.

The amount of plastic deformation or the amount of plastic deformation that occurs at the tip of the side frame in the collision direction that occurs during this impact is called the crush stroke.If this crush stroke is designed to be, for example, about 300 mm before collapse, it is usually this amount. A hook with a width of about 100mm is attached approximately to the center of the crush stroke.

The conventional hook attached to the side frame used for this purpose is as shown in Fig. 5, and is located at a position slightly closer to the center of the vehicle body than the tip of the side frame 1. A hook 2 made of a thick plate is fixed to approximately the center of the frame by bolts, welding, or the like.
By the way, according to the structure of the hook described above, in order to fix a strong thick plate to the side of the side frame 1, the hook 2 of the crush stroke
Only the part where is attached has high rigidity,
In the event of a collision, the side frame does not collapse or bends into a curved shape, making it unable to absorb collision energy well, which has an unfavorable effect on the energy absorption crushing behavior of the side frame. Another problem was that it was difficult in terms of design to ensure a longer crushing stroke in order to allow the side frame to smoothly absorb energy.

(Purpose of the invention) This invention is intended to overcome the above-mentioned problems in the prior art, and aims to provide an automobile hook that does not adversely affect the collision energy absorption crash behavior of the side frame during a collision.

(Means for achieving the object) In order to achieve the above object, this invention has a relatively narrow U-shaped portion and a reinforcing portion extending from the bottom of the U-shaped portion. and an end portion of the reinforcing portion and both parallel portions of the U-shaped portion so that the U-shaped portion straddles the crushing stroke portion of the side frame and the reinforcing portion faces inward of the vehicle. are respectively fixed to both outer surfaces and the bottom surface of the side frame, and have a structure that has strong strength against tensile force but weak bending against compressive force.

(Embodiment) FIG. 1 is a perspective view showing the structure of an automobile hook according to an embodiment of this invention when it is attached to a side frame.

As shown in the figure, the hook 5 according to this embodiment is composed of a U-shaped metal bar portion 6 and a reinforcing plate portion 7, and one end 7a of the reinforcing plate 7 is It is wound and bonded to the bottom of the letter-shaped rod 6. Both outer surfaces 4a, 4b and U of the side frame 4
Both upper ends of the letter-shaped rod 6 are fixed to each other by welding over an appropriate length, and the bottom surface 4c of the side frame 4 and the other end 7b of the reinforcing plate 7 are fixed with bolts 8. .

This U-shaped rod 6 is made of a material (in this embodiment, a φ12 wire rod) having sufficient strength to withstand loads such as when towing a vehicle.

In addition, the reinforcing plate 7 is made of a material that has strong strength against forces in the tensile direction but is weak against forces in the compressive direction and easily bends (in this embodiment,
Use t3.2 board material.

As mentioned above, this hook 5 is fixed to the side frame 4 at three points, so its tensile strength in the front, rear (in the case of a hook attached to the rear of the vehicle), lateral, and downward directions is strong, and it pulls the vehicle. for or
It functions as before for securing vehicles during transportation.

On the other hand, FIG. 2 shows a side view of the embodiment shown in FIG. 1, but if compressive force is applied to the side frame 4 due to a collision or the like and the side frame 4 collapses,
As shown in FIG. 3, the reinforcing plate 7 of the hook 5 is weak against compressive force, and therefore bends due to the impact force.
Then, the portion of the side frame 4 to which the hook 5 is attached is also crushed in the same manner as other portions of the side frame 4 within the crushing stroke.

In this way, if the hook of this invention is used, the crushing stroke at the tip of the side frame 4 fully performs its function in absorbing impact energy, so the rigidity of the hook as in the prior art allows It is possible to allow the side frame to fully perform the crushing behavior without hindering the crushing behavior of the side frame during a collision, or in other words, without lengthening the crushing stroke. FIG. 4 shows another embodiment according to this invention, in which the rod 6 in the embodiment of FIG. 1 is not used, and the entire hook 9 is made of an integral plate-like body having a relatively narrow U-shaped portion. This is what we created.

To install this hook 9 to the side frame,
It is fixed at three points in total, two points on both outer surfaces of the side frame and the bottom surface, using bolts 8, for example.

In the hook 9 according to this embodiment, the strength of the portion corresponding to the rod 6 is somewhat weaker than that in the embodiment shown in FIG. Make it slightly thicker (t4.5 in this implementation).

The hook 9 according to this embodiment also has strong tensile strength in the front, rear, lateral, and downward directions, but is weak in compressive force, so that it does not impede the crushing behavior of the side frame in the event of a collision.

(Effect of the invention) As explained above, according to this invention, the hook fixed at three points on both outer surfaces of the side frame and the bottom has strong strength against tensile force, but is weak against compressive force and quickly Therefore, the side frame can sufficiently absorb the impact energy at the time of a collision without increasing the crash stroke, and it is possible to obtain an automobile hook that smoothly performs the crash behavior.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the mounting structure of an automobile hook according to this invention, Fig. 2 is a side view of the embodiment according to Fig. 1, Fig. 3 is an explanatory diagram at the time of crushing, and Fig. 4 is another example according to this invention. FIG. 5 is a perspective view of a conventional automobile hook mounting structure. 4... Side frame, 5... Hook.

Claims (1)

[Scope of utility model registration request] It has a relatively narrow U-shaped part and a reinforcing part extending from the bottom of this U-shaped part, and the U-shaped part straddles the crushing stroke part of the side frame and the reinforcing part A hook for an automobile, characterized in that both parallel portions of the U-shaped portion and the end portion of the reinforcing portion are respectively fixed to both outer surfaces and the bottom surface of the side frame so that the U-shaped portion faces inward of the automobile.