JPH08324362A - Front underrun protector for truck - Google Patents

Abstract

PURPOSE: To minimize the damage to a bracket positioned on the other end part of a front underrun protector unexposed to a collision in the case of a passenger car colliding against one end part of the front underrun protector of a truck. CONSTITUTION: A front underrun protector for a truck is supported to the front end part of the frame 2 of a body through a bracket 4 and positioned below a front bumper 1 provided in front of the frame 2 so as to prevent a passenger car from getting into the lower side of the truck. In such a front underrun protector, the base end part of the bracket 4 is fixed to each lateral side of the front end part of the frame 2 of the body. A joint bracket 6 is fitted in the vertically rotatable state to the tip part of the bracket 4 through a shaft with the axis extended in the longitudinal direction of the body, and a front underrun protector body 11 is fitted in the laterally rotatable state to the joint bracket 6 through a rotary pin 12 with the axis extended in the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front underrun protector for a truck which prevents the passenger's vehicle from slipping under the truck when it collides with the front of the truck.

[0002]

2. Description of the Related Art When a passenger vehicle collides head-on with a truck, the vehicle may also slip under the truck. Therefore, in order to prevent this, there is disclosed in Japanese Utility Model Publication No. 6-8114 and Japanese Utility Model Publication No. 7-4.
As described in Japanese Patent Publication No. 209, etc., a front underrun protector is provided below the front bumper.

A front underrun protector of this type will be described with reference to FIGS. In FIG. 4, a is a truck, and a front underrun protector c is attached so as to be located below a front bumper b provided at the front end of the truck a.

5 and 6 show a support structure for the front underrun protector c. The front underrun protector c is located below a front bumper (not shown). Here, the front underrun protector c is formed of a hollow quadrangular prism, and the rear side surface of the quadrangular prism is fixed to the tip of the bracket f by a plurality of bolts and nuts g. The base end portion of the bracket f is fixed to the front end portion of the frame d of the vehicle body via bolts and nuts e.

[0005]

In the above-mentioned conventional example, since the front underrun protector c is firmly fixed to the bracket f through the plurality of bolts and nuts g, when a passenger car collides, the following occurs. Become. That is, FIG.
In the case where the passenger car i collides with the right end portion of the front underrun protector c, the right side bracket f receives an impact and is deformed rearward. At this time, the front underrun protector c has a mounting portion for the bracket f. A twisting moment in a clockwise direction centered on is applied.

This torsional moment acts on the left bracket f as a tensile load, thereby damaging it. That is, even when the passenger car i collides with only one side of the front underrun protector c, the left and right brackets f are damaged. Therefore, in addition to the front underrun protector c, the left and right brackets f.
Had to be replaced.

The present invention has been made in view of the above problems, and when a passenger vehicle collides with one end of a front underrun protector of a truck, the front underrun protector located at the other end is not affected by the collision. An object of the present invention is to provide a front underrun protector for a truck capable of minimizing damage to a bracket and the like.

[0008]

According to a first aspect of the present invention, there is provided a passenger vehicle, which is supported by a front end portion of a frame of a vehicle body through a bracket and is located below a front bumper provided in front of the frame. In a front underrun protector for a truck, which prevents the undercarriage from going under the truck, a base end portion of a bracket is fixed to each of left and right sides of a front end portion of a frame of the vehicle body, and an axis line is attached to a tip end portion of the bracket. A joint bracket is rotatably attached in the vertical direction via a shaft extending in the front-rear direction, and the front underrun protector body is rotatable in the left-right direction through a pivot pin whose axis extends in the vertical direction. Attached to. In the invention according to claim 2, the shaft is composed of a single bolt and nut.

[0009]

According to the first aspect of the present invention, when a passenger vehicle collides with the front underrun protector of the truck, if the collision position is the right end portion of the front underrun protector, the right bracket is rearwardly deformed by the impact. As a result, a rearward twisting moment acts on the right end portion of the front underrun protector.

However, since the front underrun protector pivots about the pivot pin located on the left side of the truck frame, no torsion moment acts on the left bracket. When the collision position of the passenger car is at the left end of the front underrun protector, a rearward twisting moment acts on the left end of the front underrun protector, but the front underrun protector is located on the right side of the truck frame. Since it rotates around the rotating pin, the torsional moment does not act on the right bracket.

When a passenger vehicle collides from the rear of the truck and the collision position is on the right side of the bracket, the bracket is deformed forward, so that the right end portion of the front underrun protector has a forward twisting moment. To work. Therefore, the front underrun protector rotates about the left rotation pin.

On the other hand, when the collision position is on the left bracket side, a forward moment acts on the front underrun protector, so that the front underrun protector pivots about the right pivot pin. If a passenger vehicle collides from the front or rear of the truck and the collision position is at the right or left end of the front underrun protector, and the vertical underrun protector acts on the front underrun protector, Rotates vertically around an axis located on the left or right side of the truck frame,
No torsional moment acts on the left or right bracket. In the invention according to claim 2, the joint bracket that supports the front underrun protector body is
Since it is fixed to the bracket by a single bolt, the front underrun protector body can rotate in the vertical direction about the single bolt. Therefore, the vertical twisting moment does not act on the bracket.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are claims 1 and 2.
1 shows an embodiment of a front underrun protector of a truck according to the invention described in 1., 1 is a front bumper located in front of a frame 2 of the truck, and a front end face of the frame 2 of the truck with a bumper bracket 3 interposed therebetween. It is installed.

The base ends of the brackets 4 are attached by bolts 5 to both side surfaces of the front end of the frame 2 of the truck. Both ends of the bracket 4 in the longitudinal direction are bent inward toward each other to have a U-shaped cross section, and the width between the both ends is gradually narrowed toward the tip. A U-shaped joint bracket 6 is attached to the tip of the bracket 4. That is, the joint bracket 6 includes a pair of upper and lower horizontal portions 7 that oppose each other and a vertical portion 8 that is perpendicular to the pair of horizontal portions 7. The vertical portion 8 is connected to the front side end portion of the bracket 4. Has been done.

To connect the bracket 4 and the joint bracket 6, the bolt 9 is inserted substantially horizontally into the bolt holes formed in the vertical portion 8 and the side end portion of the bracket 4, and the nut 10 is tightened. Done by. In this case, only one bolt 9 is used. The reason why the number of bolts 9 used is one is to enable the joint bracket 6 to rotate in the vertical direction about the bolt 9, as will be described later. Therefore, from the viewpoint of enabling the joint bracket 6 to rotate in the vertical direction, not only the bolt 9 but also a shaft such as a pin can be used. However, when using the pin, there is a problem in strength. Since it is necessary to make the diameter larger than the bolt 9,
In actual use, the bolt 9 is preferable.

Reference numeral 11 denotes a front underrun protector body, which is a hollow square column having a quadrangular cross section, and both ends thereof are inserted between the horizontal portions 7 of the left and right joint brackets 6. A pin hole is formed in each of the horizontal portion 7 and the upper and lower surfaces of the front underrun protector body 11, and a rotating pin 12 is vertically inserted through the pin hole. The front underrun protector main body 11 can rotate left and right around the rotating pin 12.

In the above description, an example in which the front underrun protector body 11 is applied to the front bumper 1 has been described, but it is also possible to apply it to the rear bumper. Next, the operation of this embodiment will be described. When a passenger car collides with the front underrun protector body 11 of the truck, the collision position is the right end of the front underrun protector body 11, that is, the right side of the bracket 4 located on the right side of the truck frame. 4 is deformed rearward by an impact.

Therefore, as shown by the arrow in FIG. 3, a clockwise torsion moment acts on the right end portion of the front underrun protector body 11. In addition, in FIG. 3, the upper part of the paper surface shows the right side of the front underrun protector body 11, and the lower part shows the left side of the front underrun protector body 11. When the front underrun protector main body 11 is fixed to the bracket 4 through a plurality of bolts as in the conventional example, this twisting moment causes the front underrun protector main body 1 to move.
Since it acts on the left side bracket 4 via 1, the bracket 4 is inevitable.

However, in this embodiment, the front underrun protector body 11 can be rotated around the turning pin 12 located on the left side of the frame of the truck, and therefore the front underrun protector body is caused by the twisting moment. 11 rotates clockwise. Therefore, no torsion moment acts on the left bracket 4.
When the collision position of the passenger car is on the left end portion of the front underrun protector body 11, that is, on the side of the bracket 4 located on the left side of the front frame of the truck, the front underrun protector body 11 has A counterclockwise torsion moment acts in the opposite direction,
Since the front underrun protector body 11 rotates counterclockwise around the rotation pin 12 located on the right side of the truck frame, no torsion moment acts on the right bracket 4.

When the front underrun protector body 11 according to this embodiment is applied to the rear bumper, when the collision position of the passenger car is the left end portion or the right end portion of the front underrun protector body 11 at the rear portion of the truck. , Front underrun protector body 11
Has the same effect as the above. When applying the front underrun protector body 11 to the rear bumper,
Install the bracket and joint bracket at the rear end of the body frame. The following description is for the case where the front underrun protector body 11 is applied to the rear bumper. However, the configuration and the operation effects are substantially the same as the embodiment in which the front underrun protector body 11 is applied to the front bumper. Therefore, for the sake of convenience, each component will be described using the same reference numerals as in the above-described embodiment.

That is, when the collision position of the passenger car is on the side of the right bracket 4, the bracket 4 is deformed forward, so that a counterclockwise twisting moment acts on the front underrun protector body 11. Therefore, the front underrun protector body 11 rotates counterclockwise about the left rotation pin 12. on the other hand,
When the collision position is on the left bracket 4 side, similarly, the bracket 4 is deformed forward, and a clockwise moment acts on the front underrun protector body 11. Therefore, the front underrun protector body 11
Rotates clockwise about the right rotation pin 12.

In the above description, when the passenger car collides with the truck, the left and right torsion moments act mainly on the front underrun protector body 11, but during the actual collision, the front underrun protector body 11 is Not only the lateral moment but also the vertical moment acts. That is, when a passenger vehicle collides with the front underrun protector body 11 of the truck from the front, the collision position is the right end portion of the front underrun protector body 11, that is, the right side of the bracket 4 located on the right side of the frame of the truck. The right bracket 4 is deformed upward or downward by an impact. Therefore, an upward or downward twisting moment acts on the right end portion of the front underrun protector body 11.

When the front underrun protector body 11 is fixed to the bracket 4 by a plurality of bolts as in the conventional example, this torsional moment acts on the left side bracket 4 via the front underrun protector body 11. The bracket 4 is inevitably damaged. However, in this embodiment, since the joint bracket 6 supporting the front underrun protector body 11 is fixed to the bracket 4 by a single bolt, the front underrun protector body 11 is located on the left side of the frame of the truck. The single bolt 9 can be pivoted in the vertical direction. Therefore, no torsion moment acts on the left bracket 4.

When the collision position of the passenger car is on the left end portion of the front underrun protector body 11, that is, on the side of the bracket 4 located on the left side of the front frame of the truck, the front underrun protector body 11 has a left end portion. , An upward or downward twisting moment is applied, and the left end portion of the front underrun protector body 11 rotates upward or downward about a single bolt 9 located on the right side of the truck frame. Therefore, no torsion moment acts on the right bracket 4.

The same applies to the case where a passenger car collides with the front underrun protector body 11 of the truck from behind, and the collision position of the bracket 4 located at the right end portion of the front underrun protector body 11, that is, on the right side of the frame of the truck. If it is on the right side, the bracket 4 on the right side is deformed upward or downward by an impact. Therefore, the front underrun protector body 1
Although an upward or downward torsional moment acts on the right end of 1, the front underrun protector body 11 is vertically rotatable about a single bolt 9 located on the left side of the truck frame. is there. Therefore, no torsion moment acts on the left bracket 4.

When the collision position of the passenger car is on the left end portion of the front underrun protector body 11, that is, on the side of the bracket 4 located on the left side of the front frame of the truck, the left end portion of the front underrun protector body 11 is , An upward or downward twisting moment is applied, and the left end portion of the front underrun protector body 11 rotates upward or downward about a single bolt 9 located on the right side of the truck frame. Therefore, no torsion moment acts on the right bracket 4.

As described above, in this embodiment, the front underrun protector main body 11 is attached to the bracket 4 via the joint bracket 6 so as to be rotatable left and right.
In the event of a collision with either the left or right end of
Although the front underrun protector main body 11 and the bracket 4 and the joint bracket 6 on one side that have been impacted are inevitably damaged, the bracket 4 and the joint bracket 6 on the other side are damaged. There is no need to replace it. Further, since the joint bracket 6 is attached to the bracket 4 by a single bolt 9 or a shaft such as a pin, the front underrun protector body 11 is rotatable in the vertical direction,
Therefore, when the passenger car collides with the end portion of the front underrun protector body 11, the joint bracket 6 and the bracket 4 on the side that is not shocked even if a vertical torsion moment acts on the front underrun protector body 11. Since it is not damaged, the joint bracket 6 and the bracket 4 on the impacted side may be replaced.

[0028]

According to the first aspect of the invention, the front underrun protector body is rotatably attached to the joint bracket through the turning pin in the left and right directions, so that the passenger car is left or right end of the front underrun protector body. In the event of a collision with one of the two ends, the front underrun protector body must be replaced and the bracket on one side damaged by the impact and the joint bracket must be replaced, but the other Side brackets and joint brackets are not damaged and need not be replaced. Further, since the joint bracket is rotatably attached to the bracket through the shaft, the front underrun protector body supported by the joint bracket is vertically rotatable, and therefore, the passenger car can be mounted under the front underrun. In the event of a collision with the end of the protector body, the joint bracket and bracket on the side that is not impacted even if a vertical twisting moment acts on the front underrun protector body will not be damaged. Only the joint bracket and bracket need to be replaced.

According to the second aspect of the invention, since the shaft is composed of bolts and nuts, it has a large strength, and therefore, a shaft having a relatively smaller diameter than the pin can be used, which can contribute to cost reduction. Become.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a front underrun protector for a truck according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is likewise an explanatory view of the operation.

FIG. 4 is a schematic view of a conventional front underrun protector of a truck.

FIG. 5 is a side view of the same.

FIG. 6 is a plan view of the same.

FIG. 7 is an explanatory view of the same operation.

[Explanation of symbols]

 1 Front bumper 2 Frame 4 Bracket 6 Joint bracket 11 Front underrun protector body 12 Rotating pin

Claims (2)

[Claims] 1. A front of a truck which is supported by a front end of a frame of a vehicle body via a bracket and which is located below a front bumper provided in front of the frame to prevent a passenger car from slipping under the truck. In the underrun protector, the base ends of the brackets are fixed to the left and right sides of the front end of the frame of the vehicle body, and the joint bracket is vertically moved to the tip end of the bracket through an axis whose axis extends in the longitudinal direction of the vehicle body. Front underrun protector main body is rotatably attached to the joint bracket through a pivot pin whose axis extends in the vertical direction, and is pivotally attached to the joint bracket in the left and right directions. Protector. 2. The front underrun protector for a truck according to claim 1, wherein the shaft comprises a single bolt and a nut.