JP2015205631A - Under-run protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an under-run protector capable of retaining strength and rigidity while suppressing weight and cost.SOLUTION: An under-run protector 1 forms a closed section by: an inner surface part 12 arranged on the inner side of a vehicle longitudinal direction; an outer surface part 11 arranged on the outer side of the vehicle longitudinal direction; an upper surface part 13 arranged on the upper side; and a lower surface part 14 arranged on the lower side. At least the portion of the upper surface part 13 closer to the outer surface part 11 is inclined downward from the outer side to the inner side of the vehicle longitudinal direction, and the portion of the lower surface part 14 closer to the outer surface part 11 is inclined upward from the outer side to the inner side of the vehicle longitudinal direction.

Description

  The present invention relates to an underrun protector structure that suppresses a vehicle having a low vehicle height from entering a lower side of a vehicle having a high vehicle height due to a collision.

In order to prevent a vehicle with a low vehicle height such as a normal car or a light vehicle from getting under the front or rear of a vehicle with a high vehicle height such as a truck, the front or rear of the former body frame A structure in which an underrun protector is provided below has been put into practical use.
The underrun protector is required to have strength and rigidity sufficient to prevent the vehicle from getting caught. In this regard, for example, Patent Document 1 discloses an underlamp protector formed in a hollow shape using an aluminum material which is a lightweight material.

JP 2004-175228 A

  With regard to the above-mentioned underrun protector, it is desired to promote the weight reduction and suppress the cost while ensuring the required strength and rigidity regardless of the applied material. In this case, it is required to set a cross-sectional shape that can effectively cope with a collision load input to the underrun protector.

One of the objects of the present invention was devised in view of the above problems, and is to provide an underrun protector capable of ensuring strength and rigidity while suppressing weight and cost. is there.
Note that the present invention is not limited to this purpose, and other effects of the present invention can also be achieved by the functions and effects derived from the respective configurations shown in the embodiments for carrying out the invention which will be described later. Can be positioned as

  The underrun protector disclosed herein is closed by an inner side surface portion arranged on the inner side in the vehicle front-rear direction, an outer side surface portion arranged on the outer side in the vehicle front-rear direction, an upper surface portion arranged on the upper side, and a lower surface portion arranged on the lower side. An under-run locator that forms a cross section, wherein at least a portion of the upper surface portion near the outer surface portion is inclined downward from an outer side in the vehicle front-rear direction to an inner side, and at least a portion of the lower surface portion near the outer surface portion is The vehicle is characterized by inclining upward from the outside in the vehicle front-rear direction toward the inside.

According to the disclosed underrun protector, at least the portion of the upper surface portion near the outer surface portion is inclined downward from the vehicle front-rear direction outer side toward the inner side, and at least the portion of the lower surface portion closer to the outer surface portion is inward from the outer side of the vehicle front-rear direction. Therefore, when a collision load is input to the outer side surface from the outside in the vehicle front-rear direction, the upper surface portion is connected to the outer surface portion by a component in the compression direction and a component in the diagonally upper direction. A force is applied, and the lower surface portion is applied with a component force in the compression direction and a component force in the obliquely downward direction at the joint portion with the outer surface portion. As a result, a diagonally upward component force acts on the joint portion between the outer surface portion and the upper surface portion, and a diagonally downward force component acts on the joint portion between the outer surface portion and the lower surface portion. Receive power. For this reason, it can avoid that an outer surface part receives a compressive force and buckles.
Therefore, according to the disclosed under-run protector, the strength and rigidity of the entire under-run protector can be ensured while suppressing the thickness and the cost of the outer surface portion.

It is a cross-sectional view of the underrun protector according to one embodiment. It is a perspective view which decomposes | disassembles and illustrates the member which concerns on the under-run protector and its fastening of FIG. It is a cross-sectional view of the underrun protector which concerns on a 1st modification. It is a cross-sectional view of the underrun protector which concerns on a 2nd modification. It is a cross-sectional view of the underrun protector which concerns on a 3rd modification.

  Hereinafter, an underrun protector as an embodiment will be described with reference to the drawings. Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment. In the following description, front and rear indicate front and rear of the vehicle, and left and right indicate left and right of the vehicle facing forward.

[1. Constitution]
[1-1. Peripheral structure]
First, the peripheral structure of the underrun protector 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. In the drawings, the front of the vehicle is FR, the rear of the vehicle is RR, the upper is UP, the lower is LW, the right is R, and the left is L.

  The underrun protector 1 according to the present embodiment is a so-called rear underrun protector (RUP) that is provided at the rear of a vehicle. That is, with respect to this underrun protector 1, the vehicle front-rear direction inner side means the vehicle front side, and the vehicle front-rear direction outer side means the vehicle rear side. Hereinafter, the underrun protector 1 will be described as being mounted on a vehicle in a horizontal posture.

  As shown in FIG. 2, the underrun protector 1 is extruded by, for example, an aluminum material, and the cross-sectional shape thereof is formed in a uniform shape over the longitudinal direction that is the extrusion direction. The underrun protector 1 is disposed such that its longitudinal direction is along the left-right direction of the vehicle, and is fixed to a vehicle body member such as a chassis frame (not shown) via brackets 7 and 7.

  Here, one bracket 7 is provided on each of the left and right sides of the vehicle, and is coupled to a front surface portion (inner surface portion) 12 to be described later of the underrun protector 1. Each bracket 7 includes a support portion 71 coupled to the vehicle body member, and an attachment portion 72 to which the front surface portion 12 of the underrun protector 1 is attached.

The support portion 71 has a flat plate shape, is disposed along the front-rear direction and the vertical direction, and is coupled to a chassis frame or the like.
The attachment portion 72 is a flat plate-like portion that extends from one edge of the support portion 71 to the left and right, and is disposed along the left-right direction and the up-down direction. The attachment portion 72 is formed with a hole portion 72a through which the bolt 8 for attaching the under-run protector 1 is inserted in the front-rear direction. Here, each mounting portion 72 is formed with two pairs of hole portions 72a arranged in the left and right directions centering on the joint portion with the support portion 71 (in FIG. 2, only one hole portion 72a is formed). Sign).

  On the front surface portion 12 of the under-run protector 1, a hole portion (not shown) through which the bolt 8 is inserted is formed at a position overlapping the hole portion 72a of each bracket 7 in the front-rear direction. Here, at the positions corresponding to the left and right brackets 7 on the front surface portion 12, four holes are formed penetrating in the front-rear direction.

  In FIG. 2, only one bolt 8 is shown on each of the left and right brackets 7 and the other bolts 8 are not shown, but the bolts 8 are inserted into the holes 72a of the brackets 7 and 7. . That is, here, four bolts 8 are provided for each bracket 7. Each bolt 8 is inserted from the front into the hole 72 a of the bracket 7 and the hole of the front surface portion 12 of the underrun protector 1, and is fastened to the nut assembly 5 disposed behind the front surface portion 12.

  The nut assembly 5 includes a plate member 51 formed in a front view shape similar to the front view shape of the mounting portion 72, and a nut 52 welded to the plate member 51. Here, a pair of nuts 52, 52 arranged side by side on each plate member 51 are welded side by side in two sets. The plate member 51 has a hole (not shown) through which the bolt 8 is inserted coaxially with each nut 52.

The nut assembly 5 is inserted into the under-run protector 1 from the left and right ends of the under-run protector 1 (within a closed cross-section described later), and is arranged at a position overlapping each bracket 7 in the front-rear direction. Fastened with bolt 8.
The underrun protector 1 is in a state where the front surface portion 12 is sandwiched between the left and right attachment portions 72 and the plate member 51 by fastening the bolts 8 and the nuts 52, and is fixed to the vehicle body member.

[1-2. Underrun protector]
Next, the configuration of the underrun protector 1 will be described with reference to FIG.
FIG. 1 is a cross-sectional view of the underrun protector 1 shown in FIG. 2 (a view taken along an arbitrary vertical plane extending in the front-rear direction). As shown in FIG. 1, the underrun protector 1 includes a front surface portion 12 disposed on the front side, a rear surface portion (outer surface portion) 11 disposed on the rear side, an upper surface portion 13 disposed on the upper side, and a lower side. A closed cross section is formed with the lower surface portion 14 arranged at the bottom. These four surface portions 11 to 14 constitute a substantially trapezoidal closed cross section. Here, the underrun protector 1 is formed in a vertically symmetrical and left-right symmetric shape.

The front surface portion 12 and the rear surface portion 11 are provided along a substantially vertical surface, and the upper surface portion 13 and the lower surface portion 14 are inclined with respect to the horizontal plane in the entire vehicle longitudinal direction. Each surface part 11-14 is formed in the flat form along each extension direction here, and each thickness is each formed uniformly.
The upper end portions of the front surface portion 12 and the rear surface portion 11 are coupled to both end portions in the front-rear direction of the upper surface portion 13. Further, the lower end portions of the front surface portion 12 and the rear surface portion 11 are coupled to the front and rear direction both end portions of the lower surface portion 14.

  Protruding portions (ribs) 11 a protruding rearward are formed at both upper and lower end portions of the rear surface portion 11. This protrusion 11a is for protecting the reflecting plate (reflector) 6 attached to the outer surface (vehicle rear side surface) of the rear surface portion 11. For example, when the vehicle is rear-projected and a forward load is input to the underrun protector 1, the tip of the protrusion 11 a becomes an input point (action point) of this load.

  The upper surface portion 13 and the lower surface portion 14 are inclined with respect to the horizontal upper and lower central plane C of the underrun protector 1 so that the respective rear surface portions 11 are separated from each other. That is, the entire upper surface portion 13 is inclined downward from the rear side to the front side, and the entire lower surface portion 14 is inclined upward from the rear side to the front side.

[2. Action]
Next, the operation of the underrun protector 1 will be described with reference to FIG. Here, the object A having a flat collision surface collides with the under-run protector 1 from the rear of the vehicle, and the coupling portion 30 between the upper surface portion 13 and the rear surface portion 11 and the coupling portion 40 between the lower surface portion 14 and the rear surface portion 11 Description will be made assuming that the loads P and P are input in the horizontal direction.
In FIG. 1, a mode in which the underrun protector 1 is to be deformed when the collision loads P and P are input is schematically illustrated by a two-dot chain line, but this is an actual deformation of the underrun protector 1. It does not indicate.

  As shown in FIG. 1, loads P and P are input to the rear surface portion 11 when the object A collides. Here, the collision loads P and P are input to the under-run protector 1 from the tip portions of the protrusions 11 a and 11 a that protrude most rearward in the under-run protector 1. The collision load P input to each protrusion 11a is concentrated on the coupling portions 30 and 40 having both protrusions 11a and 11a on the rear surface portion 11.

  Even when the protrusions 11a and 11a are omitted from the underrun protector 1, the coupling portion 30 between the upper surface portion 13 and the rear surface portion 11 and the coupling portion 40 between the lower surface portion 14 and the rear surface portion 11 are respectively provided on the upper surface. Since the collision load P is supported from the front by the portion 13 and the lower surface portion 14 and has high rigidity in the input direction of the collision load P (direction from the rear of the vehicle to the front of the vehicle), the collision loads P and P are coupled to the coupling portions 30 and 40. Concentrate on each.

  The collision load P concentrated on the coupling portion 30 between the upper surface portion 13 and the rear surface portion 11 is transmitted from the coupling portion 30 to the front upper surface portion 13. The upper surface portion 13 extends in a direction inclined downward with respect to the input direction of the collision load P, and the front end portion thereof is supported by the highly rigid vehicle body via the front surface portion 12 and the bracket 7. A component force P1 in the compression direction (that is, a direction inclined downward) and a component force P2 in an obliquely upward direction perpendicular to the component force P1 are applied by P. Thereby, as shown by a two-dot chain line in FIG. 1, the coupling portion 30 tends to be displaced forward and upward.

  On the other hand, the collision load P concentrated on the coupling portion 40 between the lower surface portion 14 and the rear surface portion 11 is transmitted from the coupling portion 40 to the front lower surface portion 14. The lower surface portion 14 extends in a direction inclined upward with respect to the input direction of the collision load P, and the front end portion thereof is supported by the highly rigid vehicle body via the front surface portion 12 and the bracket 7. The component force P3 in the compression direction (that is, the direction inclined upward) and the component force P4 in the obliquely downward direction perpendicular to the component force P3 are applied by P. Thereby, as shown by a two-dot chain line in FIG. 1, the coupling portion 40 tends to be displaced forward and downward.

  As described above, the coupling portion 30 between the upper surface portion 13 and the rear surface portion 11 tends to be displaced upward, whereas the coupling portion 40 between the lower surface portion 14 and the rear surface portion 11 tends to be displaced downward. A tensile force is applied to 11. That is, the diagonally upward component force P2 acts on the coupling portion 30 that is the upper end portion of the rear surface portion 11, and the diagonally downward component force P4 acts on the coupling portion 40 that is the lower end portion of the rear surface portion 11, so that The surface part 11 is pulled up and down. For this reason, a compressive force does not act on the rear surface part 11, and it is avoided that the rear surface part 11 is buckled and deformed by the compressive force.

[3. effect]
According to the underrun protector 1, the upper surface portion 13 is inclined downward from the rear side to the front side, and the lower surface portion 14 is inclined upward from the rear side to the front side. A tensile force is applied but no compressive force is applied. For this reason, it is possible to avoid the buckling due to the compressive force acting on the rear surface portion 11.

  Therefore, it is not necessary to increase the plate thickness in order to avoid buckling, and the rear surface portion 11 may be set to a plate thickness that can withstand the tensile force. Thereby, the intensity | strength and rigidity of the whole underrun protector 1 are securable, suppressing the board thickness of the rear surface part 11, and suppressing a weight and material cost.

Further, since the under-run protector 1 is extruded by an aluminum material, it is possible to easily suppress the weight while ensuring the strength and rigidity simply by setting the cross-sectional shape. Further, since the under-run protector 1 is integrally formed, the assembling cost can be suppressed.
Further, since the under-run protector 1 is formed in a vertically symmetric and left-right symmetric shape, the under-run protector 1 can be prevented from being erroneously mounted.

[4. Modified example]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. Moreover, each structure of embodiment mentioned above can be selected as needed, and may be combined suitably.

In the above, each of the surface portions 11 to 14 is formed in a flat plate shape along each extending plane, and each thickness is uniformly formed, but the shape of each of the surface portions 11 to 14 is as follows. It is not limited to the above. For example, like the underrun protector 2 shown in FIG. 3, the thickness of the upper surface portion 23 and the lower surface portion 24 is formed so as to gradually increase from the vehicle rear side toward the vehicle front side. (Shown by a one-dot chain line) may be provided inclined.
In this example, the thickness of the upper surface portion 23 and the lower surface portion 24 changes throughout the vehicle longitudinal direction, and the center of the plate thickness is inclined, but it is closer to the rear surface portion 21 of the upper surface portion 23 and the lower surface portion 24. The thickness may be partially changed in the portion, or the thickness center may be inclined.

  In the underrun protector 2, the upper surface 23 a of the upper surface portion 23 and the lower surface 24 a of the lower surface portion 24 are both provided along a substantially horizontal direction, whereas the lower surface 23 b of the upper surface portion 23 is formed as a whole. Is inclined downward from the rear side toward the front side, and the entire upper surface 24b of the lower surface portion 24 is inclined upward from the rear side toward the front side. Accordingly, the center of the plate thickness of the upper surface portion 23 is provided to be inclined downward from the rear side to the front side, and the center of the plate thickness of the lower surface portion 24 is provided to be inclined upward from the rear side to the front side. .

  Even in such an underrun protector 2, when the collision loads P and P are input to the rear surface portion 21 from the rear, the upper surface portion 23 and the lower surface portion 24 have the front end portions of the front surface portion 22 and the bracket 7, respectively. Therefore, the rear end portion of the upper surface portion 23 is applied with a component force in an obliquely upward direction, and the rear end portion of the lower surface portion 24 is applied with a component force in an obliquely downward direction.

  That is, also in this case, the rear surface portion 21 has a component force in an obliquely upward direction on its upper end portion and a component force in an obliquely downward direction on its lower end portion, so that a tensile force is applied but a compressive force is applied. Absent. Therefore, similarly to the underrun protector 1 of the above-described embodiment, the compressive force does not act on the rear surface portion 21, and the rear surface portion 21 can be prevented from being buckled and deformed by the compressive force.

  Further, like the under-run protector 3 shown in FIG. 4, for example, the upper surface portion 33 is formed in a curved plate shape so as to protrude downward, and the lower surface portion 34 is formed in a curved plate shape so as to protrude upward. It may be formed. In this case, the portion near the rear surface portion 31 of the upper surface portion 33 is inclined downward from the rear side to the front side, and the portion near the rear surface portion 31 of the lower surface portion 34 is inclined upward from the rear side to the front side. .

  Even when collision loads P and P are input from the rear to the rear surface portion 31 of the underrun protector 3, the upper surface portion 33 and the lower surface portion 34 are highly rigid at their front end portions via the front surface portion 32 and the bracket 7. Supported by the vehicle body, at least a portion of the upper surface portion 33 near the rear surface portion 31 is inclined downward from the rear side to the front side, and at least a portion of the lower surface portion 34 near the rear surface portion 31 is upward from the rear side to the front side. Since it is inclined, the rear end portion of the upper surface portion 33 is applied with a component force in an obliquely upward direction, and the rear end portion of the lower surface portion 34 is applied with a component force in an obliquely downward direction. That is, also in this case, since the rear surface portion 31 can apply a tensile force to the upper and lower end portions but not a compressive force, the same operation and effect as the above-described under-run protector 1 can be obtained.

  Further, like the under-run protector 4 shown in FIG. 5, the portions near the rear surface portion 41 of the upper surface portion 43 and the lower surface portion 44 are formed in inclined plate shapes, and the other portions of the upper surface portion 43 and the lower surface portion 44 are formed. May be formed in a plate shape extending substantially in a horizontal plane. That is, the upper surface portion 43 includes a flat horizontal portion 43a provided along a substantially horizontal plane, and an inclined portion 43b provided near the rear surface portion 41 and inclined downward from the rear side toward the front side. The portion 44 includes a flat plate-like horizontal portion 44a provided along a substantially horizontal plane, and an inclined portion 44b provided near the rear surface portion 41 and inclined upward from the rear side toward the front side.

  In the underrun protector 4 configured as described above, when the collision loads P and P are input to the rear surface portion 41 from the rear side, the upper surface portion 43 and the lower surface portion 44 have the front end portions of the front surface portion 42 and the bracket 7 respectively. The inclined portion 43b of the upper surface portion 43 is inclined downward from the rear side to the front side, and the inclined portion 44b of the lower surface portion 44 is inclined upward from the rear side to the front side. Therefore, the rear end portion of the inclined portion 43b in the upper surface portion 43 is applied with a component force in an obliquely upward direction, and the rear end portion of the inclined portion 44b in the lower surface portion 44 is applied with a component force in an obliquely downward direction.

In addition, a moment to displace the rear end portion of the inclined portion 43b upward acts on the joint portion 43c between the horizontal portion 43a and the inclined portion 43b in the upper surface portion 43, and the horizontal portion 44a in the lower surface portion 44 and A moment is applied to the connecting portion 44c between the inclined portion 44b and the rear end portion of the inclined portion 44b so as to be displaced downward.
That is, also in this case, since the rear surface portion 41 can apply a tensile force to the upper and lower end portions but not a compression force, the same operation and effect as the underrun protector 1 of the above embodiment can be obtained.

  In addition, although what was equipped with the rear part of a vehicle as the underrun protector 1-4 was illustrated above, the underrun protector of this invention is also what is called a front underrun protector (FUP) equipped with the front part of a vehicle. Can be applied. In the front underrun protector, the vehicle front-rear direction inner side means the vehicle rear side, and the vehicle front-rear direction outer side means the vehicle front side.

  Moreover, you may abbreviate | omit the projection parts 11a and 11a and the reflecting plate 6 which were illustrated above, for example, when using said under-run protector 1-4 as a front under-run protector. For example, even when the protrusions 11 a and 11 a are omitted from the underrun protector 1, when the collision load P is input to the outer surface portion 11 from the outside in the vehicle front-rear direction, the collision load P is It concentrates on the coupling | bond part 30 of the upper surface part 13 and the rear surface part 11 with high rigidity with respect to an input direction, and the coupling | bond part 40 of the lower surface part 14 and the rear surface part 11. FIG. For this reason, also in this case, the same operation and effect as the underrun protector 1 of the above embodiment can be obtained.

  Furthermore, the fixing method of the under-run protectors 1 to 4 exemplified above can be changed as appropriate. For example, the underrun protectors 1 to 4 may be directly joined to the vehicle body member without using the bracket 7 or the nut assembly 5. Further, the number and arrangement of the bolts 8, nuts 52 and brackets 7 are not limited to those shown above, and can be changed.

1, 2, 3, 4 Underrun protector 11, 21, 31, 41 Rear surface (outer surface)
12, 22, 32, 42 Front part (inner side part)
13, 23, 33, 43 Upper surface portion 14, 24, 34, 44 Lower surface portion P Collision load

Claims (1)

An under-run locator that forms a closed cross-section with an inner side surface disposed on the inner side in the vehicle longitudinal direction, an outer surface portion disposed on the outer side in the vehicle front-rear direction, an upper surface portion disposed on the upper side, and a lower surface portion disposed on the lower side. And
At least a portion of the upper surface portion closer to the outer surface portion is inclined downward from the vehicle front-rear direction outer side toward the inner side,
An under-run protector, wherein at least a portion of the lower surface portion near the outer surface portion is inclined upward from the outer side in the vehicle front-rear direction toward the inner side.

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