JPH0554106U - Bumper for truck - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The bumper is made of extruded material with a closed cross-section and is reinforced to make it light and strong. [Structure] Bumper 1 made of extruded material with a hollow cross section
, A nut plate having a nut 7 fixed to the mounting bolt 10 and fixed to the inner wall of the mounting portion of the bumper stay 2,
A bumper for trucks that is slidably arranged in the extrusion guide ridge. A nut is welded and fixed to the nut plate, and a guide groove (fitting insertion hole) for a guide pin is formed.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a lightweight and strong truck bumper.

[0002]

[Prior Art]

 Conventionally, in truck bumpers, it is generally known that the cross section of the bumper is closed and hollow in order to reduce the weight and maintain the strength, but in order to attach such a bumper to the bumper stay, the upper and lower back surfaces of the bumper must be attached. With a C-shaped groove for the bolt head in the longitudinal direction of (No. 62-39961) or with a C-shaped groove for the bolt head in the central longitudinal direction (No. 56-3045) Was known.

[0003]

[Problems to be solved by devising]

 According to the mounting structure, the bolts (6 to 8) required for mounting the bumper are previously inserted into the C-shaped groove and arranged at the same pitch as the bolt holes provided in the bumper stay. The bolts must be inserted into the bolt holes provided on the bumper stay at the same time. However, since there is looseness in the C-shaped groove of the bumper and each bolt, it is extremely difficult to insert all the bolts into the bolt holes at the same time, and there is a problem that requires considerable skill. .. Also, after mounting the bumper on the bumper stay, it was necessary to confirm whether or not the bumper was installed symmetrically with respect to the truck body. Furthermore, when external force is applied to the bumper, there is a problem that it may relatively easily shift to the left or right, and mud is splashed by the rear wheels of the automobile, and mud easily accumulates in the C-shaped groove of the bumper. However, there were various problems such as cleaning was not easy.

[0004]

[Means for solving the problem]

 According to this invention, therefore, the cross section of the bumper is closed and hollow over the entire length, and the guide ridge of the nut plate is provided inside the closed hollow, and the nut is fixed to the nut plate to guide the guide ridge. By doing so, the bumper supporting side wall portion and the vicinity of the mounting portion are reinforced, and the above-mentioned conventional problems are solved.

That is, in the invention, in a truck bumper made of an extruded mold member having a closed hollow section, a nut plate having a nut to be screwed with a mounting bolt fixed to an inner wall of a mounting portion of a bumper stay is extruded and guided. It is a truck bumper that is slidably installed in the rail. The nut plate is provided with a guide pin insertion hole. Next, the fitting pin insertion hole of the nut plate is a long hole having a long axis parallel to the guide ridge. Further, the bolt hole of the bumper body is a long hole having a long axis parallel to the guide ridge.

The closed hollow mentioned above means a case where the outer wall of the hollow portion is connected in an annular shape. It is known that the stress that a bumper originally receives during a rear-end collision is not evenly distributed in the longitudinal direction of the bumper, but concentrates on the attachment portion (support portion) between the bumper and the bumper stay. Therefore, the strength over the entire length of the bumper should be kept to the minimum necessary to face the external force applied during a rear-end collision, and the bumper support and its vicinity should be sufficiently strong to withstand the maximum stress generated during a rear-end collision. By reasonably strengthening the product, it reasonably meets the demand for lightness and strength.

Therefore, the bumper is closed and hollow, and the guide ridges of the nut plate are provided over the entire length on the inner wall of the mounting side wall of the bumper. Various cross-sectional shapes of this guide ridge can be considered, but if the free end is hooked (Fig. 5), the movement of the guide plate in the direction perpendicular to the sliding direction is restricted and the reinforcing effect is increased. be able to. Also, by using a nut plate made of steel, the tightening force of the bolt is dispersed in the vicinity of the attachment portion, and local concentration of stress (breakage) is prevented. For example, it is possible to prevent the bumper from breaking at the support portion of the bumper stay. Therefore, the area of the nut plate is determined in consideration of stress dispersion. In the above, the use of the steel nut plate corrects the imbalance between the strength of the bolt and the nut and the strength of the extruded mold material and ensures the retention of the nut.

As the material of the extruded mold material, for example, an aluminum alloy is used.

[0009]

[Action]

 In this invention, since an extruded material with a hollow cross section is used over the entire length of the bumper, it has relatively large deformation resistance and has a higher rigidity than an open hollow extruded material of the same thickness. In addition, since the nut plate is used, the nut plate is interposed between the nut and the extruded die material to reduce the difference between the materials of the nut plate and the fitting, and to facilitate the fitting of the nut and the nut plate. The guide ridge reinforces the stay mounting side wall of the bumper.

[0010]

Embodiment 1 An embodiment of the present invention will be described with reference to FIGS.

The guide ridges 4 and 4 of the nut plate 3 are provided at predetermined intervals inside the support wall 1 a of the bumper stay 2 of the bumper body 1 made of an aluminum alloy extruded material having a closed rectangular cross section. A guide groove (fitting insertion hole) 6 for a guide pin 5 is formed on the same, and nuts 7, 7 are fixedly attached. In the figure, 8 is a bolt hole provided in the nut plate 3, and 9 is a support for the bumper body 1. It is a bolt hole provided in the wall 1a and is a long hole. The closed rectangle is divided into two spaces 1f and 1f by a support wall 1d.

As shown in FIG. 1, the above-described embodiment has a structure in which the bumper stay 2 is fixed to the left and right sides of the bumper body 1 with four bolts. Therefore, the nut plate 3 is inserted between the guide protrusions 4 and 4 of the nut plate 3 provided inside the supporting wall 1a of the bumper body 1, and the guide pin 5 is inserted into the guide groove (fitting insertion hole) 6. To place. The guide pin is, for example, a commercially available JIS spring pin or the like. Then, the bolts 10 and 10 are inserted from the bumper stay 2 side and screwed into the nuts 7 and 7, and the bumper body 1 can be firmly fixed to the bumper stay 2 by tightening. In the above description, since the bolt hole 9 is a long hole, even if the position of the bolt 10 is slightly displaced, it can be adjusted by sliding the nut plate 3 and screwed. In this case, since the guide groove 6 of the guide pin 5 is also a long hole, it does not hinder the movement adjustment of the nut plate 3. If necessary, the bolt holes of the bumper stay 2 can be elongated. The nut plate 3 and the nut 7 are fixed to each other by welding or the like. Further, since the free ends 4a of the guide ridges 4 and 4 are bent like hooks, there is no possibility that the nut 7 will escape when the bolt 10 is screwed into the nut 7.

[0013]

Second Embodiment Another embodiment of the present invention will be described with reference to FIGS.

This embodiment corresponds to the bumper stay 2 in the first embodiment having three mounting bolts.

That is, the guide ridges 4 and 4 of the nut plate 3 are provided at predetermined intervals on the inside of the support wall 1a of the bumper stay 2 of the bumper body 1 made of an aluminum alloy extruded material having a closed rectangular cross section. A guide groove (fitting hole) 6 for a guide pin 5 is formed in the nut plate 3 and nuts 7, 7 are fixedly attached. In the figure, 8 is a bolt hole provided in the nut plate 3 and 9 is a bumper body. 1 is a bolt hole provided in the support wall 1a. Although the cross section of the bumper body 1 is a closed rectangular shape as a whole, in FIG. 8, diagonal members 1b and 1b are respectively provided at upper and lower sides to form a triangular space 1c, and between the triangular spaces 1c and 1c. In addition, a support wall 1d is provided to form two trapezoidal spaces 1e and 1e. The free ends 4a of the guide ridges 4 and 4 are bent in a hook shape. The fixing of the bumper body 1 and the bumper stay 2 is the same as in the first embodiment, and the description is omitted.

[0016]

[Effect of the device]

 In this invention, since the bumper body is formed of an extruded mold material having a hollow cross section, it has an effect of having a significantly larger deformation resistance than a homogeneous plate material having the same weight. Therefore, if the magnitude of the deformation resistance force is made constant, there is an effect that the object can be achieved with a relatively small amount of material (and therefore light weight). In addition, the use of the nut plate has the effects of reinforcing the nut contact portion, dispersing the tightening force between the bolt and the nut, and ensuring the tightening and fixing. Further, the guide ridges of the nut plate have an effect of reliably and accurately guiding the nut plate and reinforcing the support wall of the bumper body.

Furthermore, since the positioning is possible, the left and right bunlas are improved only by tightening, and it is not necessary to confirm the length, and even if mud adheres to the bumper stay mounting surface of the bumper, cleaning is easy.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a partially enlarged front view of the same.

FIG. 3 is an enlarged cross-sectional view showing a mounting state of the bumper stay in the same manner.

FIG. 4 is an enlarged front view of the nut plate.

FIG. 5 is an enlarged cross-sectional view showing a nut plate mounting state.

FIG. 6 is a front view of another embodiment of the present invention.

FIG. 7 is a partially enlarged front view of the same.

FIG. 8 is an enlarged cross-sectional view of the same bumper.

FIG. 9 is an enlarged front view of a nut plate (one nut).

FIG. 10 is an enlarged cross-sectional view showing a nut plate mounting state in the same manner.

[Explanation of symbols]

 1 Bumper body 2 Bumper stay 3 Nut plate 4 Guide ridge 5 Guide pin 7 Nut 10 Bolt

Claims (4)

[Scope of utility model registration request] 1. In a truck bumper made of an extruded mold member having a closed hollow section, a nut plate having a nut to be screwed with a mounting bolt fixed to an inner wall of a mounting portion of a bumper stay is slid into an extrusion guide ridge. A bumper for trucks, which is movably arranged 2. The bumper for truck according to claim 1, wherein the nut plate is provided with a fitting insertion hole for a guide pin. 3. The insertion hole for the guide pin of the nut plate is a long hole having a long axis parallel to the guide ridge.
Bumper for trucks listed 4. The truck bumper according to claim 1, wherein the bolt hole of the bumper body is an elongated hole having a major axis parallel to the guide ridge.