Reinforcement structure of under lamp protector

Abstract

To provide a reinforcement structure of an underrun protector which can prevent a flange of a protector body from being deformed and opened when a vehicle collides with the underrun protector.SOLUTION: A reinforcement structure of an underrun protector includes a long cylinder protector body 2 formed by placing a pair of bar members 21, 22, having long-plate-like webs 21a, 22a and a pair of flanges 21b, 22b erected from long sides of the webs in the same direction and having a C shaped cross section, in a manner that the bar members face each other and welding the flanges 21b, 22b to each other. The interior of the protector body 2 includes a reinforcement member 3 which spans a space between the flanges 21b, 22b to be welded.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a reinforcement structure of an underrun protector for preventing one vehicle from diving under another vehicle when the vehicles collide with each other.

Background Art

[0002] For example, in order to prevent a passenger car from diving under when colliding with a truck or the like, intrusion prevention devices (generally, the front device is called a front underrun protector, and the rear device is called a rear underrun protector) are obligatorily installed in the front and rear of vehicles such as trucks. For example, Patent Document 1 discloses an underrun protector attached to a vehicle frame via stays.

[0003] Specifically, as shown in FIGS. 8(a) and 8(b), a pair of stays 102 are respectively fixed to the front and rear of a pair of vehicle frames 101 extending along the vehicle longitudinal direction and spaced apart in the vehicle width direction by bolts 103 and nuts 104, and a protector main body 83 is fixed to the stays 102 by bolts 105 and nuts 106, thereby forming an underrun protector 80.

[0004] The protector main body 83 has a long cylindrical configuration with a rectangular cross section. For example, as shown in FIG. 9, a pair of bar members 81 and 82 each having a U-shaped cross section made of a steel material including webs 81a and 82a and flanges 81b and 82b vertically erected from two opposing sides of the webs 81a and 82a are opposed to each other, and the joints of the flanges 81b and 82b are welded to form (welding portion 84).

[0005] When another vehicle collides with such an underrun protector 80 and a load is applied, the hollow underrun protector 80 may be crushed and deformed in the vehicle longitudinal direction. In order to prevent this, the plate thickness of the bar members 81 and 82 is increased or high-strength steel materials are used, but this leads to an increase in the weight of the underrun protector 80 and an increase in material costs.

[0006] On the other hand, countermeasures against deformation are also taken by providing a reinforcing structure inside the underrun protector. For example, Patent Document 2 discloses a reinforcing structure in which a reinforcing member formed by bending a steel plate into a V shape is inserted inside the protector main body, the end portion is fixed to the web of the bar member located on the stay side, and the bent portion is brought into contact with the web of the bar member located on the outside of the vehicle. By providing such a reinforcing structure, when another vehicle collides with the underrun protector, the reinforcing member supports the back surface of the web at the collision portion, thereby reducing the crushing of the protector main body in the vehicle longitudinal direction.

[0007] Further, Patent Document 3 discloses a reinforcing structure in which a reinforcing member formed by bending a steel plate into a U shape is inserted inside the underrun protector, the flange tip portion of the reinforcing member is welded to the web of the bar member located on the stay side, and the web portion of the reinforcing member is brought into contact with the web of the bar member located on the outside of the vehicle. Also by such a reinforcing structure, it is possible to reduce the crushing of the underrun protector in the vehicle longitudinal direction when another vehicle collides with the underrun protector.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0009] Incidentally, as shown in Fig. 8(b), when an impact P is applied during a vehicle collision against the underrun protector 80, the underrun protector 80 is crushed in the vehicle longitudinal direction as shown in Fig. 10, and deformation is likely to occur in which the flanges 81b and 82b of the bar members 81 and 82 located on the outer side in the vehicle longitudinal direction and the bar members 82 located on the inner side in the vehicle longitudinal direction open starting from the welded portion 84. Such deformation is likely to occur at the boundary portion because there is a change in strength due to the difference in plate thickness between the overlapping and non-overlapping portions of the flanges 81b and 82b of the bar members 81 and 82.

[0010] Along with such deformation, there is also a risk of damage occurring at the welded portion 84 between the flanges 81b and 82b of the bar members 81 and 82.

[0011] However, in the conventional reinforcement structure of the underrun protector described above, although the crushing of the underrun protector 80 in the vehicle longitudinal direction can be reduced, the deformation in which the flanges 81b and 82b open cannot be prevented.

[0012] An object of the present invention is to solve such problems and provide a reinforcement structure for an underrun protector that can prevent deformation in which the flange of the bar member opens when a vehicle collides with the underrun protector.

Means for Solving the Problem

[0013] The present invention is a reinforcement structure for an underrun protector, comprising a pair of bar members having a U-shaped cross-section with a long plate-shaped web and a pair of flanges erected in the same direction from the long sides of the web facing each other, and a cylindrical protector body formed by welding the flanges to each other, and a reinforcing member welded across the flanges is provided inside the protector body. , the pair of the bar members is configured to include an outer side bar member and an inner side bar member disposed between the flanges of the outer side bar member. The protector body is formed by welding the flange of the outer side bar member and the flange of the inner side bar member at a first welding site with the pair of flanges of the inner side bar member fitted between the pair of flanges of the outer side bar member. The reinforcing member is welded to the flange of the inner side bar member at a second welding site provided on the flange. The web of the outer side bar member is located outside the vehicle in the vehicle longitudinal direction when the protector body is attached to the vehicle. The second welding site is provided at a position where the second welding site overlaps the first welding site in the vehicle longitudinal direction, or at a position outside the vehicle in the vehicle longitudinal direction with respect to the first welding site. It is characterized by this.

[0016] Furthermore, it is preferable that the reinforcing member is provided such that at least a part thereof overlaps with the attachment portion of the stay when the protector main body is attached to the vehicle via the stay as viewed in the vehicle longitudinal direction.

[0017] The reinforcing member has a trapezoidal cross-section having a flat reinforcing web and a pair of reinforcing flanges standing from two opposing sides of the reinforcing web and gradually increasing the distance from the reinforcing web as they move away from it. The tip of the reinforcing flange is welded to the flange of the bar member, and the reinforcing web abuts against the web of the protector main body when attached to the vehicle. The when attaching to the vehicle outer side bar member It is preferably in contact with the web.

Advantages of the Invention

[0018] According to the reinforcing structure of the underrun protector of the present invention, by connecting and fixing the flanges between the bar members constituting the underrun protector via the reinforcing member, it is possible to prevent the deformation of the flanges opening when the underrun protector is crushed, and it is possible to effectively prevent damage from occurring at the welding site between the flanges of the bar members.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of the reinforcement structure of the underrun protector according to the present invention will be described with reference to the accompanying drawings. In the present specification and the like, "up", "down", "front", "rear", "left", and "right" refer to the directions when a person sitting in the driver's seat is taken as a reference in a vehicle to which the reinforcement structure of the underrun protector is applied. Also, the drawings show the necessary parts preferentially for explaining the present embodiment, and the parts that do not require special explanation are omitted.

[0021] [Example 1] FIG. 1 is a side view of a vehicle 100 with an under-run protector to which a reinforcing structure of an under-run protector according to the present invention is applied, in which the under-run protector 1 of Example 1 is attached to the front and rear. FIG. 2 is a view showing the under-run protector 1 of FIG. 1, where (a) is a side view shown from the outside in the vehicle width direction, and (b) is a plan view shown from above the vehicle. In the following description, the under-run protector 1 provided at the rear will be described, but when it is provided at the front, basically the same configuration as the rear under-run protector 1 is adopted.

[0022] Also, in the following description, a plurality of embodiments of the reinforcing structure of the under-run protector according to the present invention will be described. In any of the embodiments, the under-run protector is composed of a protector main body and a reinforcing member provided in the protector main body, and is attached to the vehicle frame 101 via a stay 102 before and after the vehicle 100, similar to the conventional under-run protector shown in FIGS. 8(a) and 8(b).

[0023] The under-run protector 1 according to Example 1 is composed of a protector main body 2 having a rectangular cross-section and a long tubular shape, and a flat plate-shaped reinforcing member 3 provided in the protector main body 2.

[0024] The protector main body 2 is configured by combining two bar members, an outer side bar member 21 and an inner side bar member 22. The outer side bar member 21 and the inner side bar member 22 are members having a U-shaped cross-section each having a long plate-shaped web 21a, 22a and a pair of flanges 21b, 22b erected in the same direction from the long sides of the webs 21a, 22a. The inner side bar member 22 is smaller in size than the outer side bar member 21 and can be fitted between the flanges 21b, 21b of the outer side bar member 21.

[0025] The outer bar member 21 and the inner bar member 22 are fixed by fitting the flanges 22b, 22b of the inner bar member 22 between the flanges 21b, 21b of the outer bar member 21 in a face-to-face state and welding between the flanges 21b, 21b of each other (welding part 4 in Fig. 2(a)).

[0026] The under-run protector 1 configured in this way is attached to the vehicle frame 101 via the stay 102. In this embodiment, the web 21a of the outer bar member 21 is directed to the outside of the vehicle 100, and the web 22a of the inner bar member 22 is fixed to the stay 102 using bolts and nuts (not shown). A through hole (not shown) for this bolt fastening is formed in the web 22a of the inner bar member 22.

[0027] As shown in Fig. 2(a), a flat plate-shaped reinforcing member 3 is welded across the flanges 21b, 21b between the flanges 21b, 21b of the outer bar member 21 (welding part 5 in Fig. 2(a)). The reinforcing member 3 is welded substantially perpendicular to the flanges 21b, 21b. The reinforcing member 3 is provided on two stays 102 as shown in Fig. 2(b), and is provided at a position overlapping when viewed from the vehicle longitudinal direction with respect to the mounting portion 23 that extends along the vehicle width direction and contacts the web 22a of the inner bar member 22.

[0028] In this way, by connecting and fixing between the flanges 21b, 21b of the outer bar member 21 constituting the protector main body 2 via the reinforcing member 3, when another vehicle collides with the under-run protector 1 and the flanges 21b, 22b are about to deform to open, since the tensile force by the reinforcing member 3 is applied to the flange 21b, it is possible to prevent the deformation of the flanges 21b, 22b from opening. Further, by preventing the deformation of the flanges 21b, 22b from opening, it is possible to effectively prevent damage from occurring at the welding part 4 between the outer bar member 21 and the inner bar member 22.

[0029] In addition, the load applied when another vehicle collides with the underrun protector 1 is particularly large at the attachment portion 23, and deformation in which the flanges 21b and 22b open is likely to occur at this portion. Therefore, by providing the reinforcing member 3 so as to overlap in the vehicle width direction at the attachment portion 23, it is possible to effectively prevent the deformation in which the flanges 21b and 22b that are likely to occur at the attachment portion 23 open.

[0030] [Embodiment 2] The reinforcing structure of the underrun protector according to Embodiment 2 will be described. FIG. 3 is a side view showing the underrun protector 10 to which the reinforcing structure of the underrun protector according to Embodiment 2 is applied, as viewed from the outside in the vehicle width direction. The underrun protector 10 according to Embodiment 2 includes a cylindrical protector main body 2 having a rectangular cross section and a flat plate-shaped reinforcing member 11 provided inside the protector main body 2. In this embodiment, the same components as those in Embodiment 1 are denoted by the same reference numerals.

[0031] The protector main body 2 is formed by welding an outer side bar member 21 and an inner side bar member 22 in the same manner as the protector main body 2 used in Embodiment 1 (welding portion 4), and the attachment method to the vehicle frame 101 is also the same.

[0032] The reinforcing member 11 is a flat steel plate and is welded across the flanges 22b, 22b of the inner side bar member 22 (welding portion 12). The welding portion 12 is provided immediately inside the welding portion 4. The reinforcing member 11 is welded so as to be substantially perpendicular to the flange 22b. This reinforcing member 11 is also provided at two locations inside the protector main body 2 so as to overlap the attachment portion 23 when viewed from the vehicle front-rear direction, in the same manner as the reinforcing member 3 in Embodiment 1.

[0033] In this way, by connecting and fixing the space between the flanges 22b, 22b of the inner bar member 22 that constitutes the protector main body 2 via the reinforcing member 11, when another vehicle collides with the underrun protector 10, it is possible to prevent the flanges 21b, 22b of the protector main body 2 from deforming and opening, and it is possible to effectively prevent damage to the welding part 4 between the flanges 21b, 22b.

[0034] Also, when attaching the reinforcing member 11 to the flange 22b of the inner bar member 22, a welding part 12 between the reinforcing member 11 and the inner bar member 22 can be provided immediately inside the welding part 4 of the outer bar member 21 and the inner bar member 22. When the welding part 4 between the outer bar member 21 and the inner bar member 22 and the welding part 12 between the reinforcing member 11 and the inner bar member 22 are separated, there is room for the flange 22b between these welding parts 4, 12 to deform and open when another vehicle collides with the underrun protector 1. However, by positioning the welding part 12 of the reinforcing member 11 at the position of this embodiment, this room for deformation is eliminated, and the deformation of the flanges 21b, 22b opening can be prevented more effectively, and damage to the welding part 4 between the outer bar member 21 and the inner bar member 22 can be prevented.

[0035] [Embodiment 3] Next, the reinforcing structure of the underrun protector according to Embodiment 3 will be described. FIG. 4 is a side view showing the underrun protector 30 to which the reinforcing structure of the underrun protector according to Embodiment 3 of the present invention is applied, as viewed from the outside in the vehicle width direction. The underrun protector 30 according to Embodiment 3 is composed of a protector main body 2 having a rectangular cross-section and a long cylindrical shape, and a reinforcing member 31 having a U-shaped cross-section provided inside the protector main body 2. In this embodiment, the same components as those in Embodiment 1 are denoted by the same reference numerals.

[0036] The protector main body 2 is formed by welding an outer bar member 21 and an inner bar member 22 in the same manner as the protector main body 2 used in Embodiments 1 and 2, and the attachment method to the vehicle frame 101 is also the same.

[0037] The reinforcing member 31 is a steel material having a substantially U-shaped cross section with a flat reinforcing web 31a and a pair of reinforcing flanges 31b erected in the same direction from two opposing sides of the reinforcing web 31a. The reinforcing member 31 is fitted into the outer bar member 21 with the tip of the reinforcing flange 31b facing the web 21a of the outer bar member 21, and the peripheral edge of the reinforcing web 31a and the base end of the reinforcing flange 31b are welded to the flange 21b of the outer bar member 21. The reinforcing member 31 is provided at two locations in the protector main body 2 so as to overlap the mounting portion 23 when viewed from the vehicle front-rear direction, similarly to the reinforcing member 3 in the first embodiment.

[0038] In this way, by connecting and fixing the flanges 21b, 21b of the outer bar member 21 constituting the protector main body 2 via the reinforcing member 31, it is possible to prevent the deformation in which the flanges 21b, 22b of the protector main body 2 open, and it is possible to effectively prevent damage from occurring at the welding part 4 between the flanges 21b, 22b of the outer bar member 21 and the inner bar member 22.

[0039] Also, by using the reinforcing member 31 having a U-shaped cross section, a wide portion from the peripheral edge of the reinforcing web 31a to the base end of the reinforcing flange 31b can be used for welding, the welding of the reinforcing member 31 can be firmly performed, and the mechanical strength of the underrun protector 1 can be increased.

[0040] [Embodiment 4] Next, the reinforcing structure of the underrun protector according to Embodiment 4 will be described. FIG. 5 is a side view showing the underrun protector 40 to which the reinforcing structure of the underrun protector according to Embodiment 4 is applied, as viewed from the outside in the vehicle width direction. The underrun protector 40 according to Embodiment 4 is composed of a protector main body 2 having a rectangular cross-section and a long cylindrical shape, and a reinforcing member 41 having a U-shaped cross section provided inside the protector main body 2. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals.

[0041] The protector main body 2 is formed by welding the outer bar member 21 and the inner bar member 22 in the same manner as the protector main body 2 used in the first to third embodiments, and the attachment method to the vehicle frame 101 is also the same.

[0042] The reinforcing member 41 is a steel material having a substantially U-shaped cross section with a reinforcing web 41a and a pair of reinforcing flanges 41b, 41b, similar to the reinforcing member 31 of the third embodiment. The reinforcing member 41 is fitted into the inner bar member 22 with the tip portion of the reinforcing flange 41b facing the web 22a of the inner bar member 22, and the peripheral edge portion of the reinforcing web 41a and the base end portion of the reinforcing flange 41b are welded to the flange 22b of the inner bar member 22 (welding portion 42). The reinforcing member 41 is provided at two locations within the protector main body 2 so as to overlap the attachment portion 23 when viewed in the vehicle longitudinal direction, similar to the reinforcing member 3 in the first embodiment.

[0043] In this way, by connecting and fixing the space between the flanges 22b, 22b of the inner bar member 22 constituting the protector main body 2 via the reinforcing member 41, it is possible to prevent the deformation in which the flanges 21b, 22b of the protector main body 2 open, and effectively prevent damage from occurring at the welding portion 4 between the flanges 21b, 22b of the outer bar member 21 and the inner bar member 22.

[0044] Further, by using the reinforcing member 41 having a U-shaped cross section, a wide portion such as the peripheral edge portion of the reinforcing web 41a and the base end portion of the reinforcing flange 41b can be used for welding, the welding of the reinforcing member 41 can be firmly performed, and the mechanical strength of the underrun protector 40 can be increased.

[0045] Furthermore, by attaching the reinforcing member 41 to the flange 22b of the inner side bar member 22, a welding portion 42 of the reinforcing member 41 and the inner side bar member 22 can be provided immediately inside the welding portion 4 of the outer side bar member 21 and the inner side bar member 22, similar to the reinforcing structure of the underrun protector according to the above-described Example 2. Thereby, it is possible to effectively prevent the deformation in which the flanges 21b and 22b open, and to prevent the welding portion 4 of the outer side bar member 21 and the inner side bar member 22 from being damaged.

[0046] [Example 5] Next, the reinforcing structure of the underrun protector according to Example 5 will be described. FIG. 6 is a side view showing the underrun protector 50 to which the reinforcing structure of the underrun protector according to Example 5 is applied, as viewed from the outside in the vehicle width direction. The underrun protector 50 according to Example 5 includes a cylindrical protector main body 2 having a rectangular cross section, and a reinforcing member 51 having a trapezoidal cross section provided inside the protector main body 2. In this embodiment, the same components as those in Example 1 are denoted by the same reference numerals.

[0047] The protector main body 2 is formed by welding an outer side bar member 21 and an inner side bar member 22, similar to the protector main body 2 used in Examples 1 to 4, and the method of attaching it to the vehicle frame 101 is also the same.

[0048] The reinforcing member 51 is a steel material having a trapezoidal cross section, including a flat reinforcing side web 51a, and a pair of reinforcing side flanges 51b, 51b that are erected from two opposing sides of the reinforcing side web 51a and whose intervals gradually increase as they move away from the reinforcing side web 51a. The tip portion of the reinforcing side flange 51b is welded to the flange 21b of the outer side bar member 21, and the reinforcing side web 51a is in contact with the web 21a of the outer side bar member 21. Similar to the reinforcing member 3 in Example 1, the reinforcing member 51 is provided at two locations inside the protector main body 2 so as to overlap the attachment portion 23 when viewed in the vehicle longitudinal direction.

[0049] In this way, by connecting and fixing the space between the flanges 21b and 21b of the outer bar member 21 constituting the protector main body 2 via the reinforcing member 51, it is possible to prevent the deformation in which the flanges 21b and 22b of the protector main body 2 open, and it is possible to effectively prevent damage from occurring at the welding part 4 between the flanges 21b and 22b of the outer bar member 21 and the inner bar member 22.

[0050] Further, by the reinforcing web 51a of the reinforcing member 51 abutting on the back side of the web 21a of the outer bar member 21 and supporting it, it is possible to effectively prevent the web 21a of the outer bar member 21 from being pushed in and the protector main body 2 from being crushed when colliding with other vehicles.

[0051] [Example 6] Next, the reinforcing structure of the underrun protector according to Example 6 will be described. FIG. 7 is a side view showing the underrun protector 60 to which the reinforcing structure of the underrun protector according to Example 6 is applied, as viewed from the outside in the vehicle width direction. The underrun protector 60 according to Example 6 is composed of a protector main body 2 having a rectangular cross-section and a reinforcing member 61 having a trapezoidal cross-section provided inside the protector main body 2. In this embodiment, the same components as those in Example 1 are denoted by the same reference numerals.

[0052] The protector main body 2 is formed by welding an outer bar member 21 and an inner bar member 22 in the same manner as the protector main body 2 used in the underrun protectors 1 according to Examples 1 to 5, and the method of attaching it to the vehicle frame 101 is also the same.

[0053] The reinforcing member 61 is a steel material with a trapezoidal cross-section, similar to the reinforcing member 51 in Example 5, having a reinforcing side web 61a and a pair of reinforcing side flanges 61b, 61b whose intervals gradually widen as they move away from the reinforcing side web 61a. The tip portion of the reinforcing side flange 61b is welded to the flange 22b of the inner side bar member 22, and the reinforcing side web 61a is in contact with the web 21a of the outer side bar member 21. The reinforcing member 61 is provided at two locations within the protector main body 2 so as to cover the attachment portion 23 when viewed from the vehicle front-rear direction, similar to the reinforcing member 3 in Example 1.

[0054] In this way, by connecting and fixing the space between the flanges 22b, 22b of the inner side bar member 22 that constitutes the protector main body 2 via the reinforcing member 61, it is possible to prevent the deformation of the flanges 21b, 22b of the protector main body 2 from opening, and effectively prevent damage to the welding portion 4 between the flanges 21b, 22b of the outer side bar member 21 and the inner side bar member 22.

[0055] Also, by the reinforcing side web 61a of the reinforcing member 61 abutting against and supporting the back side of the web 21a of the outer side bar member 21, it is possible to effectively prevent the web 21a of the outer side bar member 21 from being pushed in and the protector main body 2 from being crushed when colliding with other vehicles.

[0056] Furthermore, by attaching the reinforcing member 61 to the flange 22b of the inner side bar member 22, similar to the reinforcing structure of the underrun protector according to Example 2 or 4 described above, a welding portion 62 between the reinforcing member 61 and the inner side bar member 22 can be provided immediately inside the welding portion 4 between the outer side bar member 21 and the inner side bar member 22. Thereby, it is possible to effectively prevent the deformation of the flanges 21b, 22b from opening and prevent damage to the welding portion 4 between the outer side bar member 21 and the inner side bar member 22.

[0057] In addition, in each of the above-described embodiments, the reinforcing members 3, 11, 31, 41, 51, 61 are formed so as to completely overlap the mounting portion 23 in the vehicle width direction when viewed from the vehicle front-rear direction. However, in the present invention, it is sufficient that at least a part of the reinforcing members 3, 11, 31, 41, 51, 61 is provided so as to overlap the mounting portion 23 in the vehicle width direction when viewed from the vehicle front-rear direction. That is, even when most of the reinforcing members 3 or the like are displaced from the mounting portion 23 in the vehicle width direction when viewed from the vehicle front-rear direction, the case where the left end portion of the reinforcing member 3 or the like overlaps the right end portion of the mounting portion 23, or the case where the right end portion of the reinforcing member 3 or the like overlaps the left end portion of the mounting portion 23 is also included in the present invention. Thereby, it is possible to effectively prevent the deformation in which the flanges 21b, 22b that are likely to occur in the mounting portion 23 open.

[0058] Further, in each of the above-described embodiments, the protector main body 2 is formed by welding each other in a state where the inner side bar member 22 is fitted into the outer side bar member 21 having a U-shaped cross section. However, the present invention is not limited to this, and two bar members having the same U-shaped cross section may be used, and the protector main body may be formed by welding the tip portions of the flanges of each other in a state where the tip portions of the flanges are abutted against each other.

[0059] In each of the above-described embodiments, since the reinforcing members 3, 11, 31, 41, 51, 61 are welded only to either the flange 21b of the outer side bar member 21 or the flange 22b of the inner side bar member 22, there is an advantage in that the outer side bar member 21 or the inner side bar member 22 to which the reinforcing member 3 or the like is attached can be handled as one member. However, the present invention is not limited to this, and those welded so as to bridge between the flanges 21b, 22b of different bar members 21, 22 are also included.

[0060] Further, in each of the above-described embodiments, two reinforcing members 3, 11, 31, 41, 51, 61 are provided for one protector main body 2. However, the present invention is not limited to this, and one or three or more reinforcing members 3, 11, 31, 41, 51, 61 may be provided.

Explanation of reference numerals

[0061] 1, 10, 30, 40, 50, 60: Under lamp protector 2: Protector body 21: Outer side bar member 21a: Web 21b: Flange 22: Inner side bar member 22a: Web 22b: Flange 23: Mounting part 3, 11, 31, 41, 51, 61: Reinforcing member 4, 5, 12, 32, 42, 52, 62: Welding part 101: Frame 102: Stay 31a, 41a, 51a, 61a: Reinforcing side web 31b, 41b, 51b, 61b: Reinforcing side flange 100: Vehicle

Claims

1. A pair of bar members having a U-shaped cross section, each having a long plate-like web and a pair of flanges erected in the same direction from the long sides of the web, are opposed to each other, and a cylindrical protector body formed by welding the flanges to each other is provided. Inside the protector body, a reinforcing member is provided which is welded across the flanges. The pair of bar members are configured to include an outer side bar member and an inner side bar member disposed between the flanges of the outer side bar member. The protector body is formed by welding the flanges of the outer side bar member and the flanges of the inner side bar member at a first welding site with the flanges of the inner side bar member fitted between the pair of flanges of the outer side bar member. The reinforcing member is welded to the flange of the inner side bar member at a second welding site provided on the flange. The web of the outer side bar member is located outside the vehicle in the vehicle front-rear direction when the protector body is attached to the vehicle. The second welding site is provided at a position where the second welding site overlaps the first welding site in the vehicle front-rear direction, or at a position outside the vehicle in the vehicle front-rear direction relative to the first welding site. A reinforcing structure for an underrun protector, characterized in that.

2. The reinforcing member is provided such that at least a part thereof overlaps the attachment portion of the stay when viewed from the vehicle front-rear direction in a state where the protector body is attached to the vehicle via the stay. The reinforcing structure for an underrun protector according to claim 1, characterized in that.

3. The reinforcing member has a trapezoidal cross-section having a flat reinforcing-side web and a pair of reinforcing-side flanges that are erected from two opposing sides of the reinforcing-side web and whose intervals gradually widen as they move away from the reinforcing-side web. The tip portions of the reinforcing-side flanges are welded to the flanges of the bar member, and the reinforcing-side web abuts against the web of the outer-side bar member when the protector body is attached to the vehicle. The reinforcing structure of the underrun protector according to claim 1 or 2, characterized in that.

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