JPH1044888A - Rear-end collision impact relaxation device for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strengthen absorbing force accompanying impact so as to miniaturize the device by inserting a metallic easy buckling frame body into a rear-end collision impact relaxation device, and sealingly filling the mutual spaces formed in the metallic easy buckling frame body with resin brittle bodies. SOLUTION: A rear-end collision impact relaxation device 5 is fixed to the rear end of a working vehicle 4 through a fitting bracket 6. The rear-end collision impact relaxation device 5 is provided with a protection cover 51 made of a thin stainless steel sheet for example on the outside, easy buckling lattice-like frames 52 are arranged into six rows for example inside the protection cover 51, and the inner mutual space parts of the easy buckling lattice-like frames 52 are sealingly filled with resin brittle bodies 53 formed out of urethane resin or the like for example. Further, a cushion member 54 is laid on the inner bottom face part of the protection cover 51. When a rear-end collision accident by the other vehicle A occurs from the rear end direction of the working vehicle 4, the protection cover 51 is broken, and the impact force is absorbed by the resin brittle bodies together with the lattice-like frames while the easy buckling lattice-like frames 52 is broken and compressively deformed by the impact force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear-end impact mitigation device for a working vehicle that is running at a low speed while stopped or running on a road.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a road maintenance work vehicle (hereinafter simply referred to as "work vehicle") 1 is provided with a mounting bracket 2 at a rear end thereof.
The rear-end impact mitigation device 3 is fixed to a metal cover 31 made of, for example, a thin stainless steel plate, and a buffer member 32 made of a special rigid polyurethane foam or various foaming agents is densely filled. ing.

As a method of filling the protective cover 31, there are a case where the buffer member 32 is filled as it is and a case where the buffer member 32 is sealed and filled in a storage bag or the like.

As described above, according to the prior art, the ability to absorb the impact force generated when another vehicle (not shown) collides with the work vehicle 1 is weak, and the work vehicle 1 is protected in the event of a collision. Therefore, the rear-end impact mitigation device 3 needs to have a large and long structure. Therefore, in order to make the length of the work vehicle 1 itself constant, it was necessary to cut off the rear end of the main body chassis of the work vehicle 1 to reduce the length of the vehicle.

[0005] In addition, Article 18-1 of the Protection Standard for Road Transport Vehicles
In Item 4, the distance S from the center of the rearmost axle to the rear end face of the rear-end impact mitigation device 3 is not more than 2/3 of the horizontal distance L from the center of the frontmost axle of the vehicle to the center of the rearmost axle. It is determined to fit.

In the prior art, Japanese Patent Laid-Open No.
There is a technology disclosed in Japanese Patent Application Laid-Open No. 156168, which relates to a vehicle for preventing intrusion. A pair of left and right buffer boxes is attached to a loading platform, and the pair of buffer boxes is placed in an upright state between a loading platform and a position behind the loading platform. It is configured to be able to move back and forth, to be able to fall down left and right at a position behind the loading platform, and to make the entire width of the pair of buffer boxes after the fall down larger than the vehicle width.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the size of a rear-end impact mitigation device fixed to the rear end of a work vehicle and to make it short, so that efficient work is facilitated and productivity is improved. Another object of the present invention is to provide a rear-end impact mitigation device for a working vehicle that is highly used.

An object of the present invention is to insert a buckling lattice frame made of aluminum metal into a rear-end impact mitigation device fixed to the rear end of a work vehicle, and to insert a urethane resin or the like into the mutual space between the lattices. It is an object of the present invention to provide a rear-end impact mitigation device for a working vehicle which is filled with a brittle resin material in a sealed manner, enhances the absorption force of the rear-end impact force, and is durable even with a strong impact force.

[0009]

According to a first aspect of the present invention, there is provided a work vehicle and a rear-end impact mitigation device mounted on a rear end of the work vehicle, wherein A metal buckling frame is inserted into the metal buckling frame, and a brittle resin body is hermetically filled between spaces formed in the metal buckling frame.

According to a second aspect of the present invention, in the configuration according to the first aspect, the metal buckling frame is a buckling lattice frame made of aluminum metal. .

According to a third aspect of the present invention, in the first or second aspect, the brittle resin is made of a flame-retardant self-extinguishing foam.

According to claim 4 of the present invention, claims 1 and 2
Or the mounting bracket for mounting the rear-end impact mitigation device on the vehicle body, wherein the mounting bracket is slidably fixed to the vehicle body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a working vehicle in operation or the like, which is provided with a rear-end impact mitigation device via a mounting bracket at the rear end of the working vehicle. The rear-end impact mitigation device is a protective cover formed of a rectangular parallelepiped (box case), and has a buckling lattice frame made of metal such as aluminum inserted therein. And
A brittle resin is densely filled between the lattice portions.

In such a configuration, when another vehicle (not shown) collides with the rear portion of the work vehicle, the above-mentioned rear-end impact mitigation device is compressed and deformed as if crushed. While the impact force at this time deforms the buckling lattice frame inside the device, the brittle resin body is also broken and compressed.

[0015] Due to the reciprocal mechanical action of the buckling lattice frame and the brittle resin body, a strong impact force generated by a rear-end collision can be absorbed.

[0016]

1 to 3 show a rear impact shock absorber for a working vehicle according to the present invention. Hereinafter, an embodiment of the present invention will be described.

Reference numeral 4 denotes a working vehicle stopped on the road. Here, the work vehicle is a road maintenance work vehicle, and refers to a sign vehicle, a water removal vehicle, a sweeper, a snowplow, a high work vehicle, and the like.
Reference numeral 41 denotes a sign fixed to the support post 42, which is "working".
And an arrow indicating the traveling direction of the vehicle. This alerts the drivers of other vehicles to prevent rear-end collisions. 5 is a rear-end impact mitigation device,
It is fixed to the rear end of the work vehicle 4 by the mounting bracket 6. In the figure, reference numerals 43 and 44 denote tires fitted to the frontmost axle and the rearmost axle, respectively. Reference numeral 45 denotes a diffused warning light fixed to the upper end of the column 41. This performs a rotating action and calls attention to other vehicles.

The structure in which the rear-end impact mitigation device 5 is fixed to the rear end of the work vehicle 4 via the mounting bracket 6 will be described. If the rear-end impact is large, for example, if the impact force exceeds the absorbing ability, the impact In order to absorb the force, the mounting bracket 6 is fixed to the body chassis or the like of the work vehicle 4 in such a manner that the mounting bracket 6 is configured to be slip-slid so as to absorb the residual impact force that has been exceeded. I have.

The rear impact impact mitigation device 5 has a protective cover 51 made of, for example, a thin stainless steel plate on the outside, and a box-shaped case is preferable as the shape.

A plurality of buckling lattice frames 52 made of metal such as aluminum as shown in FIG. 3 are provided in a plurality of rows inside the protective cover 51. In this embodiment, six rows are provided in a row. An internal mutual space portion of the buckling lattice frame 52 is hermetically filled with a resin brittle body 53 made of, for example, urethane resin. The buckling lattice frame 5 filled with the brittle resin 53
Each set of 2 is arranged in 6 rows.

It should be noted that the brittle resin body 53 is replaced with the buckling lattice frame 52.
As a means for filling the internal mutual space, the resin brittle body 53 is melted and cooled and solid-formed integrally with the buckling grid frame 52, or the resin brittle body 53 is filled with the buckling grid frame 5.
In this embodiment, the space is cut into a rectangular parallelepiped and is inserted into the space of the lattice frame 52. In the former case, equipment, machinery and the like are required, but they have the feature that molding can be performed easily and quickly.

A cushion member 54 is laid on the inner bottom surface of the protective cover 51, which is the same as the conventional rear impact impact mitigation device 3.

Next, a case where an impact force is applied from the rear end direction of the work vehicle 4 due to a rear-end collision accident of another vehicle as shown by an arrow A will be described. The impact is applied to the rear-end impact mitigation device 5, and the protective cover 51 is broken. Further, this impact force is applied to the buckling lattice frame 52, and the frame 52 is destructively compressed and deformed while interacting with the brittle resin 53. Absorbs impact while acting. In this case, even if a strong impact force is applied to the work vehicle 4,
The damage and damage of the vehicle 4 are reduced.

[0024]

According to the first aspect of the present invention, a buckling metal frame filled with a brittle resin such as a flame-retardant foam material is inserted into the inside of the rear-end impact mitigation device, thereby absorbing the impact accompanying the impact. The force becomes strong, the rear-end impact mitigation device can be miniaturized and the length (depth) can be shortened, and the mass-production, productivity and utilization are rich. On the other hand, since the rear-end impact mitigation device is reduced in size, the length of the bed of the work vehicle can be increased, and the work efficiency can be improved together with the increase in the load.

According to the second and third aspects of the present invention, since the buckling frame is formed as a lattice-shaped frame, the absorption of impact force due to a rear-end collision and the action of a brittle resin are combined, and the absorption is improved. And the miniaturization of the device can be promoted.

According to the fourth aspect of the present invention, since the mounting bracket is configured to be slidable, the remaining impact force exceeding the impact absorbing ability can be smoothly absorbed.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a work vehicle and a rear-end impact mitigation apparatus according to the present invention.

FIG. 2 is a rear view of the work vehicle as viewed from an arrow II direction in FIG. 1;

FIG. 3 is an enlarged perspective view of a main part of the rear-end impact mitigation apparatus according to the present invention, in which main parts are cut away.

FIG. 4 is a side view, partially cut away, of a work vehicle showing an example of a conventional technique.

[Explanation of symbols]

 Reference Signs List 4 work vehicle 5 rear-end impact mitigation device 51 protective cover 52 buckling lattice frame 53 brittle resin

Claims (4)

[Claims] In a configuration comprising a work vehicle and a rear impact shock absorber mounted on a rear end of the work vehicle, a metal buckling frame is inserted into the rear impact shock absorber, and A rear impact impact mitigation device for a working vehicle, wherein a brittle resin body is hermetically sealed between spaces formed in a buckling frame. 2. The collision impact mitigation device for a working vehicle according to claim 1, wherein the metal buckling frame is a buckling lattice frame made of aluminum metal. 3. The collision impact mitigation device for a working vehicle according to claim 1, wherein the brittle resin is a flame-retardant self-extinguishing foam. 4. A collision impact mitigation device for a working vehicle according to claim 1, wherein a mounting bracket for attaching the rear impact mitigation device to the vehicle body is slidably fixed to the vehicle body.