JP2008260448A - Mounting structure of front under run protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a front under run protector enabling improvement of mounting work efficiency of the front under run protector. <P>SOLUTION: In this mounting structure 1, a frame 3 of a vehicle is provided with a stay 4 extending downward and in a vehicle width direction to mount the front under run protector 2 arranged in a front lower part of the vehicle on the frame 3. In the mounting structure 1, a lower surface bracket 5 projecting to the front from a lower end part of the stay 4 and joined to the front under run protector 2 from a lower side and a front surface bracket 7 projecting upward from the front under run protector 2 and joined to the stay 4 from the front are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mounting structure for a front underrun protector that is supported by a vehicle frame and disposed at a lower front portion of the vehicle.

  A front underrun protector (hereinafter referred to as FUP) that is disposed in the lower front part of the vehicle is known in order to prevent the other vehicle from entering under one vehicle at the time of a collision between the vehicles (for example, FUP) (for example, , See Patent Document 1).

  Conventionally, as a structure for attaching an FUP to a vehicle frame, bolt fastening from the rear of the vehicle is frequently used.

  For example, as shown in FIGS. 13 and 14, the vehicle frame 3 includes a pair of side rails 31, 31 extending in the front-rear direction and a cross member 32 that couples the side rails 31, 31. A stay 102 for attaching the FUP 101 is provided at the front end.

  The stay 102 has a plate-like attachment portion 103 that extends downward from the side rail 31 and outward in the vehicle width direction, and the FUP 101 is bolted to the attachment portion 103.

  As shown in FIG. 15, the attachment portion 103 of the stay 102 is provided with an insertion hole 104 penetrating in the front-rear direction. On the other hand, the FUP 101 is formed in a hollow shape (box cross-sectional shape), and on the inner surface of the FUP 101. A welding nut 105 is provided for joining the bolts.

  The bolt 106 that fixes the FUP 101 is inserted into the insertion hole 104 in the mounting portion 103 of the stay 102 from the rear side of the vehicle, and is screwed into the welding nut 105 in the FUP 101, and the bolt 106 is fastened so that the FUP 101 is fixed to the stay 102. Is attached to the frame 3 (side rail 31) of the vehicle.

JP 2004-352159 A

  However, the above-described FUP mounting structure has the following problems.

  That is, when an operator assembles the FUP 101 from the rear side of the vehicle, various parts such as an engine and a suspension are mounted on the side rail 31, and these parts are close to the stay 102, which is an obstacle. The tightening workability was poor.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mounting structure for a front underrun protector that solves the above problems and can improve the mounting workability of the front underrun protector.

  In order to achieve the above object, the present invention is directed to a stay that extends downward and in the vehicle width direction in order to attach a front underrun protector disposed in the lower front portion of the vehicle and extending in the vehicle width direction to the frame of the vehicle. The front underrun protector mounting structure is provided with a bottom bracket that protrudes forward from the lower end of the stay and is joined to the front underrun protector from below, and upward from the front underrun protector. A front bracket that protrudes and is joined to the stay from the front is provided.

  Preferably, the lower surface bracket penetrates from below and is screwed to the front underrun protector, and the lower surface bolt that joins the lower surface bracket and the front underrun protector and the front bracket penetrate from the front. The front bracket is screwed to the stay, and the front bracket and the front bolt for joining the stay are provided.

  Preferably, the front underrun protector includes a channel-shaped outer and inner facing each other in the front-rear direction, and the front bracket is joined to the upper surface of the inner.

  The front underrun protector is provided with a U-shaped reinforce that sandwiches the front underrun protector from above and below, and the front bracket is joined to the upper surface of the reinforce, and the front underrun protector is connected to the front underrun protector through the reinforce. It may be attached to the stay.

  Preferably, the lower surface bracket and the front surface bracket each have an impact absorbing portion that extends in the front-rear direction and that contracts in the front-rear direction and absorbs an impact when the vehicle collides.

  Preferably, the impact absorbing portion is an arcuate curved portion.

  According to the present invention, it is possible to improve the mounting workability of the front underrun protector.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, a front / underrun protector mounting structure according to this embodiment will be described with reference to FIGS. 1, 2, and 13. In FIG. 2, an arrow F indicates the tightening direction of the bolt.

  As shown in FIG. 13, the vehicle frame 3 is a ladder frame, and includes a pair of side rails 31, 31 that extend in the front-rear direction and are spaced apart in the vehicle width direction, and the side rails 31, 31. And a plurality of cross members 32 to be coupled. The frame 3 is not limited to a ladder frame.

  As shown in FIG. 1 and FIG. 2, the mounting structure 1 for the front underrun protector (hereinafter referred to as FUP) of the present embodiment is designed to mount the FUP 2 arranged at the front lower part of the vehicle to the frame 3 of the vehicle. The side rail 31 of the frame 3 is provided with a stay 4 that extends downward and in the vehicle width direction. The lower surface bracket 5 projects forward from the lower end of the stay 4 to support the FUP 2 from below, and the lower surface bracket 5 And a lower surface bolt 6 that joins the lower surface bracket 5 and the FUP 2 and a front bracket (hereinafter referred to as a bracket upper) 7 that protrudes upward from the FUP 2 and faces the stay 4 from the front. The bracket upper 7 is passed through from the front and screwed into the stay 4, and the bracket upper 7 and And a front bolt 8 for bonding the tape 4.

  The attachment structure 1 is provided for each side rail 31. In the following description, only the left side in the vehicle width direction will be described, and the description on the right side will be omitted.

  The FUP 2 is disposed in front of and below the side rail 31 and extends in the vehicle width direction. The FUP 2 has a hollow rectangular cross section, and is formed by joining a channel shape (groove shape, U-shaped cross section) outer 22 and inner 23 facing each other by welding or the like. The outer 22 is disposed on the front side, and the inner 23 is disposed on the rear side.

  The inner 23 of the FUP 2 includes a substantially vertical web 231 and upper and lower flanges 232 and 233 extending forward from the upper and lower ends of the web 231. The bracket upper 7 is joined to the upper surface (outer surface) of the upper flange 232, and the upper surface (inner surface) of the lower flange 233 is screwed onto the lower surface bolt 6 that penetrates the lower flange 233 from below. A mating bottom nut member 24 is provided. A plurality (two in the illustrated example) of the lower surface nut members 24 are arranged at intervals in the vehicle width direction. The lower surface nut member 24 of this embodiment consists of a weld nut integrally joined to the lower flange 233 by welding.

  The stay 4 is disposed at the front end of the side rail 31 and is attached to the outer side surface of the side rail 31 in the vehicle width direction. The stay 4 has a plate-like rail joint portion 41 extending downward from the side rail 31 and a plate-like bracket attachment portion 42 extending outward from the front end of the rail joint portion 41 in the vehicle width direction. As seen from above, it is formed in an L shape.

  A plurality of insertion holes 411 are formed in the upper portion of the rail joint portion 41 of the stay 4, and bolts or rivets are inserted into the insertion holes 411 to fix the stay 4 to the side rail 31. On the rear surface of the bracket mounting portion 42, a front nut member 43 that is screwed into the front bolt 8 that penetrates the bracket mounting portion 42 from the front is provided. A plurality of (two in the illustrated example) front nut members 43 are arranged at intervals in the vehicle width direction. The front nut member 43 of the present embodiment is formed of a weld nut joined to the rear surface of the bracket attachment portion 42 by welding.

  The lower surface bracket 5 is a plate-like stay joint portion 51 that extends vertically along the bracket mounting portion 42 of the stay 4 and a plate-like shape that extends forward from the lower end of the stay joint portion 51 and supports the inner 23 of the FUP 2. It has a protector support 52 and is formed in an L shape when viewed from the vehicle width direction as a whole.

  The stay joint portion 51 of the lower surface bracket 5 has substantially the same size as the bracket attachment portion 42 of the stay 4 and is joined to the front surface of the bracket attachment portion 42 by welding or the like. Further, in the stay joint portion 51, a plurality (two) of insertion holes 511 through which the front bolt 8 is inserted correspond to the front nut member 43 of the bracket mounting portion 42 of the stay 4 (position aligned in the front-rear direction). Formed.

  The protector support 52 of the lower surface bracket 5 contacts the lower surface of the inner 23 (lower flange 233) and supports the inner 23 (FUP2) from below. The protector support 52 is formed with a plurality (two) of insertion holes 521 through which the lower surface bolt 6 passes.

  The bracket upper 7 is fixed to the upper surface of the inner 23 of the FUP 2. The bracket upper 7 extends upward from the inner 23 and has a plate-like stay mounting portion 71 facing the stay joint portion 51 (the bracket mounting portion 42 of the stay 4) of the lower surface bracket 5, and forward from the lower end of the stay mounting portion 71. And a plate-like inner joint portion 72 extending along the upper surface of the inner 23 (upper flange 232), and is formed in an L shape when viewed from the vehicle width direction as a whole.

  The stay mounting portion 71 of the bracket upper 7 is disposed at a front-rear position where the rear surface of the stay mounting portion 71 is substantially flush with the rear surface of the web 231 of the inner 23. A plurality (two in the illustrated example) of insertion holes 711 through which the front bolt 8 is inserted are formed in the stay mounting portion 71. Further, the inner joint portion 72 is joined to the upper surface of the upper flange 232 in the inner 23 by welding or the like, whereby the bracket upper 7 is fixed to the inner 23.

  The above stay 4, the lower surface bracket 5, and the bracket upper 7 are formed, for example, by press-molding a blank material.

  Further, the front bolts 8 are provided in the same number (two in the illustrated example) as the front nut members 43 of the stay 4 and are screwed into the front nut members 43, respectively. The lower surface bolts 6 are provided in the same number (two in the illustrated example) as the lower surface nut members 24 of the FUP 2 and screwed into the lower surface nut members 24, respectively.

  Next, the operation of the FUP mounting structure 1 according to this embodiment will be described with reference to FIGS. 1 and 2.

  In order to attach the FUP 2 to the vehicle frame 3, first, the bracket upper 7 and the bottom nut member 24 are respectively fixed to the upper and lower flanges 232 and 233 of the inner 23 of the FUP 2 in advance, and the bottom surface is attached to the bracket mounting portion 42 of the stay 4. The bracket 5 and the front nut member 43 are fixed.

  Next, as shown in FIG. 2, the FUP 2 to which the bracket upper 7 and the lower surface nut member (welding nut) 24 are fixed is placed on the protector support 52 of the lower surface bracket 5 fixed to the stay 4. Perform positioning. Specifically, the protector support for the lower surface bracket 5 is provided so that the insertion hole 711 of the bracket upper 7 and the insertion hole 511 in the stay joint portion 51 of the lower surface bracket 5 and the front nut member 43 of the stay 4 are aligned in the vehicle width direction. The FUP 2 is positioned so that the insertion hole 521 in the portion 52 and the bottom nut member 24 of the FUP 2 are aligned in the front-rear direction and the vehicle width direction.

  Next, with the FUP 2 positioned, the front bolt 8 is inserted from the front through the insertion hole 711 of the bracket upper 7 and the insertion hole 511 of the stay joint portion 51 of the lower surface bracket 5, and the front nut member 43 of the stay 4. To conclude. Further, the lower surface bolt 6 is inserted from below into the insertion hole 521 in the protector support portion 52 of the lower surface bracket 5 and fastened to the lower surface nut member 24 of the FUP 2.

  Thus, the FUP 2 is attached to the vehicle frame 3 via the stay 4.

  As described above, in the present embodiment, the welding nut (lower surface nut member) 24 is provided on the lower inner wall of the hollow FUP 2 and the lower surface bracket 5 is provided on the stay 4. The lower surface of the FUP 2 can be bolted (fastened) to the stay 4, the welding nut (front nut member) 43 is provided on the stay 4, and the bracket upper 7 is provided on the upper surface of the FUP 2. The upper surface of the FUP 2 can be bolted to the stay 4 from the front.

  As a result, the FUP 2 can be attached from the front side of the vehicle, and the attachment work from the rear side is not required, so that the attachment workability (work posture) can be improved and the work time can be shortened.

[First modification]
Next, the FUP mounting structure of the first modification will be described with reference to FIGS.

  This modified example is substantially the same as the above-described embodiment shown in FIGS. 1 and 2 except for the shape of the bracket upper. Accordingly, the same elements as those in the above-described embodiment are given the same reference numerals in the drawings, and detailed description thereof is omitted.

  As shown in FIG. 3, in the mounting structure 11 of this modification, the stay mounting portion 73 of the bracket upper (front bracket) 7 is formed in a U-shaped cross section when viewed from the top in order to improve the strength.

  Specifically, as shown in FIG. 4, the bracket upper 7 has a U-shaped cross section extending vertically and having a lower end joined to the upper surface of the upper flange 232 of the inner 23 by welding or the like, The stay attachment portion 73 has a web joining portion 74 that extends downward along the rear surface of the web 231 of the inner 23 and is joined to the rear surface of the web 231 by welding. A plurality of insertion holes 731 (two spaced apart in the vehicle width direction in the illustrated example) are formed in the stay mounting portion 73 so as to penetrate the front and rear and the front bolt 8 is inserted.

  Even in this modification, the same effects as those of the above-described embodiment can be obtained.

[Second modification]
Next, an FUP mounting structure according to a second modification will be described with reference to FIGS. 5 and 6.

  This modification is different from the above-described embodiment shown in FIGS. 1 and 2 in that a reinforcement is provided on the FUP, and the others are substantially the same. Accordingly, the same elements as those in the above-described embodiment are given the same reference numerals in the drawings, and detailed description thereof is omitted.

  As shown in FIGS. 5 and 6, the mounting structure 12 of the present modification includes a reinforcement 9 having a U-shaped cross section that sandwiches the FUP 2 from above and below.

  The reinforcement 9 has a U-shaped cross section and extends in the vehicle width direction, and includes a web 91 and upper and lower flanges 92 and 93. The inner 23 of the FUP 2 is sandwiched between the upper and lower flanges 92 and 93 of the reinforcement 9, and the upper and lower flanges 232 and 233 of the inner 23 and the upper and lower flanges 92 and 93 of the reinforcement 9 are joined by welding or the like. Is done.

  An inner joint 72 of the bracket upper 7 is joined to the upper surface (outer surface) of the upper flange 92 of the reinforcement 9, and the FUP 2 is attached to the stay 4 via the bracket upper 7 and the reinforcement 9.

  Further, a lower surface nut member 24 (for example, a welding nut) to which the lower surface bolt 6 is screwed is joined to the upper surface (inner surface) of the flange 93 on the lower side of the reinforcement 9 by welding or the like. The FUP 2 is attached to the stay 4 via the reinforcement 9.

  The above-described reinforcement 9 is fixed to the FUP 2 in advance before the FUP 2 is attached to the stay 4.

  Even in this modification, the same effects as those of the above-described embodiment can be obtained. Furthermore, in this modification, since it is not necessary to fix the welding nut (lower surface nut member) 24 in the FUP 2, the FUP 2 is made of, for example, a pipe material other than that configured by combining the outer 22 and the inner 23. Can be used.

[Third modification]
Next, an FUP mounting structure according to a third modification will be described with reference to FIGS.

  This modification is substantially the same as the second modification described above, except that the bracket upper is bolted to the reinforcement and the bottom bracket is made up of two parts. Accordingly, the same elements as those in the second modification described above are designated by the same reference numerals in the drawings, and detailed description thereof is omitted.

  As shown in FIGS. 7 and 8, in the mounting structure 13 of this modification, the bracket upper 7 is fixed to the upper flange 92 of the reinforcement 9 by the bracket fixing bolt 74. More specifically, a plurality of insertion holes 721 (two in the vehicle width direction at intervals) through which the bracket fixing bolts 74 are inserted are formed in the inner joint portion 72 of the bracket upper 7. A bracket fixing nut member (for example, a welding nut) 94 to which the bracket fixing bolt 74 is screwed is joined to the lower surface of the flange 92 on the upper side of the reinforcement 9 by welding or the like. The bracket fixing bolt 74 is inserted into the insertion hole 721 in the inner joint portion 72 of the bracket upper 7 from above and is screwed into the bracket fixing nut member 94 of the reinforcement 9.

  Further, the lower surface bracket 5 of the present modification abuts on the lower surface of the lower flange 93 of the reinforcement 9, and extends a plate 55 extending rearward from the lower flange 93 to the lower side of the stay 4, and the plate 55. It is comprised with the bracket lower 56 for attaching to the stay 4. FIG.

  As shown in FIG. 8, the bracket lower 56 is formed in an L shape when viewed from the vehicle width direction, extends vertically along the rear surface of the bracket mounting portion 42 of the stay 4, and is joined by welding or the like. A stay joint portion 561 and a plate-like plate joint portion 562 extending rearward from the lower end of the bracket attachment portion 42 are provided.

  A plate fixing nut member 563 to which a plate fixing bolt 551 for fixing the plate 55 to the stay 4 via the bracket lower 56 is screwed is provided on the upper surface of the plate joint portion 562. The plate fixing nut member 563 is made of, for example, a weld nut joined to the plate joint 562 by welding or the like.

  An insertion hole 552 through which the lower surface bolt 6 is inserted is formed at the front end of the plate 55, and an insertion hole 553 through which the plate fixing bolt 551 is inserted is formed at the rear end.

  The bracket upper 7 and the lower bracket 5 are attached to the reinforcement 9 and the stay 4 in advance before attaching the FUP 2 to the stay 4.

  In the present embodiment, the same effects as those of the second modification described above can be obtained.

[Other Embodiments]
Next, an FUP mounting structure according to another embodiment will be described with reference to FIGS.

  This embodiment is substantially the same as the third modification described above, except that the reinforcement is omitted and that the lower surface bracket and the bracket upper have an impact absorbing portion. Accordingly, the same elements as those in the third modification described above are designated by the same reference numerals in the drawings, and detailed description thereof is omitted.

  As shown in FIG. 9, the mounting structure 14 of the present embodiment has a structure with an impact absorbing function, and the FUP 2 and the stay 4 are not in close contact with each other so that a space is taken and a shock absorbing space at the time of collision (in FIG. 9). Is designated).

  As shown in FIG. 10, the FUP 2 and the stay 4 are connected by a lower surface bracket 5 and a bracket upper 7, and a protrusion (curved portion) 571 that forms an impact absorbing portion at an intermediate portion between the lower surface bracket 5 and the bracket upper 7. , 77 are provided.

  That is, the lower surface bracket 5 and the bracket upper 7 of the present embodiment each have an impact absorption portion that extends in the front-rear direction and that contracts in the front-rear direction and absorbs an impact when the vehicle collides. It consists of protrusions (arc-shaped curved portions) 571 and 77.

  More specifically, the FUP 2 is mounted via a lower surface bracket 5 and a bracket upper 7 that are spaced apart from the front of the stay 4 and extend forward from the stay 4 in order to secure the shock absorbing space S. .

  The lower surface bracket 5 includes a plate 57 extending in the front-rear direction and a bracket lower 56 fixed to the stay 4. The plate 57 is formed with an arc-shaped protrusion (curved portion) 571 that extends forward from the bracket lower 56 to the lower surface of the inner 23 of the FUP 2 and curves downward and protrudes at an intermediate position in the front-rear direction.

  The bracket upper 7 includes a plate-like inner joint 75 that extends back and forth along the upper surface of the inner 23, a plate-like stay attachment 76 that extends along the front surface of the bracket attachment 42 of the stay 4, and an inner joint 75. And a connecting portion extending rearward to the stay attaching portion 76 while being inclined upward, and an arcuate protruding portion (curved portion) 77 that curves and protrudes forward and upward is formed at the connecting portion.

  Next, the operation of the present embodiment will be described based on FIG.

  As shown in FIG. 12, when the vehicle collides, the impact load input to the FUP 2 is applied to the lower surface bracket 5 and the bracket upper 7, and the projections 571, 77 of the lower surface bracket 5 and the bracket upper 7 are moved back and forth by the impact load. Degenerate to deform. The impact load is absorbed by the deformation of the protrusions 571 and 77.

  Thus, in the present embodiment, the lower surface bracket 5 and the bracket upper 7 constitute an impact absorbing material, and the lower surface bracket 5 and the bracket upper 7 absorb the impact load until the FUP 2 hits the stay 4.

  Also in this embodiment, the same effects as those of the above-described embodiment can be obtained, and further, the following effects can be obtained.

  That is, the FUP 2 is a device that prevents a dive in a frontal collision, so that the FUP 2, the stay 4 and the frame 3 are integrated to withstand the load. However, in the conventional structure of FIG. Regardless of this, in the case of deformation due to a collision, it is necessary to replace parts, resulting in high replacement costs each time.

  On the other hand, in the present embodiment, a space (deformation allowance) is provided between the FUP 2 and the stay 4 to absorb the impact by the lower surface bracket 5 and the bracket upper 7, so that the lower surface bracket 5 and the bracket upper at the time of a light collision. 7 is only deformed and stay 4 is not affected. As a result, the replacement of parts after a collision can be minimized, and the part replacement cost can be reduced.

  In addition, this invention is not limited to the above-mentioned embodiment, Various modifications and application examples can be considered.

  For example, in the embodiment described above, the lower surface bracket 5 and the bracket upper 7 are bolted by the lower surface bolt 6 and the front surface bolt 8, but the present invention is not limited to this, and the lower surface bracket 5 and the bracket upper 7 may be rivet bonded or welded. Conceivable.

  Further, the bottom nut member 24 of the FUP 2 is omitted, and a female screw to which the bottom bolt 6 is screwed is directly formed on the lower flange 233, and the front nut member 43 of the stay 4 is omitted and the bracket mounting portion 42 of the stay 4 is omitted. It is also conceivable to directly form a female screw into which the front bolt 8 is screwed.

  Further, the shock absorbing part is not limited to the arcuate curved part, and for example, a wave-like part may be considered.

FIG. 1 is a rear perspective view of a mounting structure for a front underrun protector according to an embodiment of the present invention. FIG. 2 is a side view of the mounting structure of the front underrun protector of the present embodiment. FIG. 3 is a rear perspective view of the front underrun protector mounting structure of the first modification. FIG. 4 is a side view of the front underrun protector mounting structure of the first modification. FIG. 5 is a rear perspective view of the front underrun protector mounting structure of the second modification. FIG. 6 is a side view of a front underrun protector mounting structure according to a second modification. FIG. 7 is a rear perspective view of the front underrun protector mounting structure of the third modification. FIG. 8 is a side view of the front underrun protector mounting structure of the third modification. FIG. 9 is a side view for explaining the shock absorbing space by the mounting structure for the front underrun protector according to another embodiment. FIG. 10 is a side view of a front underrun protector mounting structure according to another embodiment, showing a state in which the front underrun protector is mounted. FIG. 11 is a side view for explaining attachment of a front underrun protector according to another embodiment. FIG. 12 is a side view for explaining an impact absorbing action by the front underrun protector according to another embodiment, and shows a state in which the front and bottom brackets are deformed. FIG. 13 is a front perspective view of a vehicle frame. FIG. 14 is a rear perspective view of the vehicle frame. FIG. 15 is a side view of a conventional front underrun protector mounting structure.

Explanation of symbols

1, 11, 12, 13, 14 Front underrun protector mounting structure 2 FUP (front underrun protector)
3 Frame 4 Stay 5 Bottom bracket 6 Bottom bolt 7 Front bracket 8 Front bolt

Claims (6)

Installation of a front underrun protector provided with a stay extending downward in the vehicle width direction to the frame of the vehicle in order to attach a front underrun protector disposed in the lower front portion of the vehicle and extending in the vehicle width direction. In structure
A lower surface bracket that protrudes forward from the lower end of the stay and is joined to the front underrun protector from below, and a front bracket that protrudes upward from the front underrun protector and is joined to the stay from the front. Front underrun protector mounting structure.   The bottom bracket penetrates from below and is screwed into the front underrun protector. The bottom bolt that joins the bottom bracket and the front underrun protector and the front bracket penetrate from the front to the stay. The front underrun protector mounting structure according to claim 1, further comprising a front bolt that is screwed to join the front bracket and the stay. The front underrun protector is provided with a channel-shaped outer and inner facing front and rear,
The front underrun protector mounting structure according to claim 1 or 2, wherein the front bracket is joined to an upper surface of the inner. The front underrun protector has a U-shaped cross-sectional reinforcement that sandwiches the front, underrun, and protector from above and below,
The front underrun protector attachment structure according to claim 1 or 2, wherein the front bracket is joined to an upper surface of the reinforcement, and the front underrun protector is attached to the stay via the reinforcement.   5. The front underside according to claim 1, wherein the lower surface bracket and the front surface bracket each extend in the front-rear direction, and have an impact absorbing portion that contracts in the front-rear direction and absorbs an impact when the vehicle collides. Run protector mounting structure.   The front underrun protector mounting structure according to claim 5, wherein the shock absorbing portion is formed of an arcuate curved portion.

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