JP6289999B2 - Front underrun protector - Google Patents

Description

  The present invention relates to a front underrun protector included in a large vehicle such as a truck.

  Large vehicles such as trucks and tractors have a front underrun protector (hereinafter referred to as FUP) located below the front end of the frame. The FUP suppresses a vehicle from entering under a frame of a large vehicle when a vehicle having a vehicle height lower than that of a large vehicle such as a passenger car collides with the front end of the large vehicle (for example, Patent Document 1).

JP 2004-237878 A

  Incidentally, the FUP is required to withstand a predetermined load acting on the FUP in order to prevent a vehicle that has collided with the FUP from entering under the frame. Since the resistance to the load is increased by increasing the thickness of the FUP, it is possible that the FUP has resistance to the required load. However, when the thickness of the FUP is increased, the weight of the FUP and thus the weight of the vehicle is increased.

  An object of the present invention is to provide a front underrun protector capable of suppressing an increase in weight in obtaining a desired resistance to a load.

  One aspect of the front underrun protector has a protector body having a box shape extending along the longitudinal direction which is one direction, a plate shape extending along the longitudinal direction, and the protector body in the longitudinal direction. And a reinforcement fixed inside the protector main body at each of both side portions sandwiching the center. The protector body includes a protector intermediate portion having a linear shape extending along the longitudinal direction, and two protector end portions sandwiching the protector intermediate portion in the longitudinal direction. The protector end portion is continuously bent from the protector intermediate portion so as to be positioned rearward in the front-rear direction perpendicular to the longitudinal direction as the portion having a greater distance from the protector intermediate portion, and the protector intermediate portion The part where the distance in the front-rear direction is smaller is included in the part where the distance from is larger. In the reinforcement, the section having a curved shape protruding forward is continuous along the longitudinal direction, and the portion protruding at the end of the protector has a size protruding forward in the longitudinal direction. Toward the end of the protector, and has a shape that continuously decreases in accordance with the width of the protector body.

  According to one aspect of the front underrun protector, the portion closer to the end of the protector body has a smaller width in the front-rear direction, and the reinforcement located inside the protector body is divided into both sides in the longitudinal direction of the protector body. Therefore, the weight of the front underrun protector is reduced.

Since the center in the longitudinal direction of the front underrun protector is usually a portion supported by a side frame or the like, resistance to the load received by the front underrun protector can be obtained even without reinforcement. On the other hand, both sides of the front underrun protector can withstand the load received by the front underrun protector by reinforcement. In the reinforcement, the cross-sectional shape having a curved shape protruding forward is continuous along the longitudinal direction, and the size protruding forward does not change abruptly at the portion located at the end of the protector. The shape of the protector is difficult to change. Therefore, in the front underrun protector, it is possible to suppress a decrease in resistance to the load received by the front underrun protector.
As a result, according to the above-described configuration, in the front underrun protector, it is possible to suppress an increase in weight in obtaining a desired resistance to a load.

  In another aspect of the front underrun protector, in the reinforcement, a portion located in the middle portion of the protector is continuously reduced toward the center of the protector body in a size of protruding forward in the cross section. Have a shape to

  According to the other aspect of the front underrun protector, the protrusion of the reinforcement continuously decreases toward the center in the longitudinal direction of the protector body where the reinforcement is not located. Therefore, it is possible to suppress a sudden change in the thickness of the reinforcement between the portion where the reinforcement is located and the portion where the reinforcement is not located. Therefore, since it is possible to suppress the force from being concentrated on a portion of the protector intermediate portion that overlaps the end portion of the reinforcement, it is possible to suppress a change in the shape of the front underrun protector.

  In another aspect of the front underrun protector, the reinforcement has a recess that is recessed along the longitudinal direction at an end portion of the protector body that is close to the center.

  According to the other aspect of the front underrun protector, the depression of the reinforcement prevents the force from being concentrated on the end of the reinforcement, which is close to the center of the protector body. Therefore, it is possible to suppress the shape of the front underrun protector from changing at the portion of the front underrun protector where the end portion of the reinforcement near the center of the protector body is located.

  In another aspect of the front underrun protector, the protector end portion includes a curved portion continuing from the protector intermediate portion and an extending portion extending from the curved portion along the longitudinal direction. The curved portion bends continuously from the protector intermediate portion so that the portion with a greater distance from the protector intermediate portion is located at the rear, and the portion with a greater distance from the protector intermediate portion has the front-rear direction. It has a shape with a small width. The extending portion has a shape in which a cross-sectional shape orthogonal to the longitudinal direction is constant along the longitudinal direction.

  According to another aspect of the front underrun protector, the cross-sectional shape perpendicular to the longitudinal direction is constant along the longitudinal direction in the extending portion of the protector end. Therefore, when two or more types of protector bodies having different longitudinal widths in the protector body are formed by pressing, the protector body can be formed by any of the following methods. That is, by using forming materials having different widths in the longitudinal direction, or by shortening the length of the protector body in the longitudinal direction in the forming material after molding, the front under lamp protector using the same mold is used. Molding is possible. Therefore, according to the front underrun protector having the above-described protector main body, a manufacturing method capable of reducing the cost required for the production of the front underrun protector is adopted as a method of manufacturing a plurality of types of front underrun protectors. Can do.

  In another aspect of the front underrun protector, the front underrun protector further includes a step bracket positioned between a rear surface of the reinforcement and an inner surface of the protector body. The step bracket is joined to the protector body in a state where a rear surface of the step bracket is in contact with the inner side surface of the protector body.

  According to another aspect of the front underrun protector, the load received by the step bracket through the step acts on the side frame or the like through the inner surface of the protector body. Therefore, the load received by the step is easily transmitted to the side frame and the like. Therefore, the step bracket can support the step in a state where the step is resistant to a predetermined load.

It is a disassembled perspective view which shows one Embodiment which actualized the front underrun protector of this invention with the peripheral structure of a front underrun protector. It is a perspective view which shows the perspective structure which looked at FUP from the front. It is a partial expanded sectional view which expands and shows the partial cross section structure of FUP. It is a top view which shows the structure which looked at a part of main body fixing | fixed part with which FUP, and a reinforcement top view. FIG. 5 is a cross-sectional view showing a cross-sectional shape of the FUP along line 5-5 in FIG. FIG. 6 is a cross-sectional view showing a cross-sectional shape of the FUP along line 6-6 in FIG. 4. FIG. 7 is a cross-sectional view showing formation of a cross-section of the FUP along the line 7-7 in FIG. It is sectional drawing which shows the cross-sectional shape of FUP along line 8-8 in FIG. It is an effect | action figure for demonstrating the effect | action of FUP. It is an effect | action figure for demonstrating the effect | action of FUP.

  An embodiment embodying a front underrun protector will be described with reference to FIGS. 1 to 10. Hereinafter, the configuration of the front end portion of the vehicle including the front underrun protector (hereinafter referred to as FUP), the configuration of the FUP, the configuration of the reinforcement, and the operation of the FUP will be described in order.

[Configuration of front end of vehicle]
A configuration of the front end portion of the vehicle will be described with reference to FIG.
As shown in FIG. 1, the vehicle is positioned between two side frames 11 extending along the front-rear direction of the vehicle, and the front extending along the vehicle width direction orthogonal to the front-rear direction. A cross member 12 and two brackets 13 fastened to each side frame 11 one by one are provided.

  The bracket 13 is fastened to the FUP 14 extending along the vehicle width direction and the side frame 11, and attaches the FUP 14 below the side frame 11. Of the two ends in the vehicle width direction of the FUP 14, the right end is located outside the right side frame 11, and the left end is located outside the left side frame 11.

In the FUP 14, a step 15 extending toward the rear of the FUP 14 along the vehicle width direction is fastened to each of two ends in the vehicle width direction.
A bumper reinforcement 16 is positioned in front of the front cross member 12, the bracket 13, and the FUP 14, and the bumper reinforcement 16 is fastened to each of the two brackets 13. A bumper 17 is located in front of the bumper reinforcement 16, and the bumper 17 is fastened to the bumper reinforcement 16.

  The FUP 14 is fixed inside the protector main body 20 at each of the protector main body 20 having a box shape extending along the vehicle width direction as the longitudinal direction and both side portions sandwiching the center of the protector main body 20 in the vehicle width direction. Two reinforcements 21 are provided. The reinforcement 21 has a plate shape extending along the vehicle width direction. For example, the reinforcement 21 is fixed inside the protector main body 20 by welding, but may be fixed inside the protector main body 20 by fastening with a fastening member.

  The protector body 20 includes a body fixing part 22 and a body cover part 23. Among these, the main body fixing portion 22 has a plate shape extending along the vehicle width direction, and the reinforcement 21 is fixed to the main body fixing portion 22. The main body cover portion 23 has a plate shape that similarly extends in the vehicle width direction, and covers the entire main body fixing portion 22 from the front of the main body fixing portion 22. For example, the main body cover portion 23 is fixed to the main body fixing portion 22 by welding, but may be fixed to the main body fixing portion 22 by fastening of a fastening member. The FUP 14 has a plate shape extending in the vertical direction, and includes a main body cap portion 24 that closes each opening formed by the main body fixing portion 22 and the main body cover portion 23 at an end in the vehicle width direction.

  The FUP 14 further includes two fastening members 25 that are used one by one to fasten each of the two brackets 13 to the main body fixing portion 22, and one to fasten each of the two steps 15 to the main body fixing portion 22. And two step brackets 26 used one by one. The step bracket 26 has a plate shape extending along the vehicle width direction inside the FUP 14.

[Configuration of FUP]
The configuration of the FUP 14 will be described with reference to FIGS. FIG. 2 is a perspective view showing a perspective structure of the FUP 14 as viewed from the front. In FIG. 2, for convenience of explanation, a part of the protector main body 20 is cut away, and the reinforcement 21 located inside the protector main body 20. A part of is shown. FIG. 3 is an enlarged partial cross-sectional view showing an enlarged cross-sectional structure of an end portion of the FUP 14 located on the right side of the vehicle.

  As shown in FIG. 2, in the FUP 14, one reinforcement 21 is positioned inside each of the protector main body 20 and on both sides of the protector main body 20 across the center C in the vehicle width direction.

  The protector body 20 includes a protector intermediate portion 31 having a linear shape extending along the vehicle width direction, and two protector end portions 32 sandwiching the protector intermediate portion 31 in the vehicle width direction.

  The protector end portion 32 includes a shape that is continuously bent from the protector intermediate portion 31 so that a portion having a greater distance from the protector intermediate portion 31 is positioned rearward in the front-rear direction. That is, the protector end portion 32 includes a shape that is continuously bent rearward as the distance from the protector intermediate portion 31 increases. The protector end portion 32 further includes a shape in which the end portion width W2 that is the width in the front-rear direction is smaller as the distance from the protector intermediate portion 31 is larger. On the other hand, in the protector intermediate part 31, the intermediate part width W1, which is the width in the front-rear direction, is substantially constant in the vehicle width direction. In a part of the protector end portion 32, the end portion width W <b> 2 gradually decreases from the intermediate portion width W <b> 1 toward the end of the protector body 20.

  The FUP 14 includes a portion whose width in the front-rear direction is smaller as the portion is closer to the end of the protector body 20, and the reinforcement 21 located inside the protector body 20 is divided into both sides in the vehicle width direction of the protector body 20. Therefore, the weight of the FUP 14 is reduced. Thereby, since the weight of the vehicle is reduced, the weight of the luggage that can be loaded on the vehicle is increased, and the fuel efficiency of the vehicle is increased.

  In the reinforcement 21, a cross-section having a curved shape protruding forward from the main body fixing portion 22 toward the main body cover portion 23 is continuous along the vehicle width direction of the reinforcement 21. The reinforcement 21 has a recess 21d that is recessed along the vehicle width direction at the end of the protector body 20 near the center C in the vehicle width direction.

  As shown in FIG. 3, the protector end portion 32 includes a curved portion 41 connected from the protector intermediate portion 31 and an extending portion 42 extending from the curved portion 41 along the vehicle width direction. The curved portion 41 has a shape that is continuously bent from the protector intermediate portion 31 so that a portion having a larger distance from the protector intermediate portion 31 is positioned rearward. That is, the curved portion 41 has a shape that is continuously bent toward the rear as the distance from the protector intermediate portion 31 increases.

  Further, the curved portion 41 has a shape in which the end portion width W2 that is the width in the front-rear direction is smaller as the distance from the protector intermediate portion 31 increases. Therefore, the end width W <b> 2 of the curved portion 41 has a maximum value at a portion connected to the protector intermediate portion 31 and has a minimum value at a portion connected to the extending portion 42. On the other hand, in the extending portion 42, the end width W2 is constant along the vehicle width direction. That is, the extending portion 42 has a constant cross-sectional shape perpendicular to the vehicle width direction along the vehicle width direction.

  The step bracket 26 is located between the rear surface 21r of the reinforcement 21 and the front surface 22f of the main body fixing portion 22 that is a part of the inner surface of the protector main body 20. The step bracket 26 is joined to the main body fixing portion 22 in a state where the rear surface 26r of the step bracket 26 is in contact with the front surface 22f of the main body fixing portion 22. The step bracket 26 may be joined to the main body fixing portion 22 by welding, for example, or may be joined using an adhesive material for fixing the step bracket 26 to the main body fixing portion 22. .

  The step bracket 26 has a plurality of fastening holes that penetrate the step bracket 26 in the front-rear direction, and a fastening member that passes through the fastening holes fastens the step 15 to the FUP 14. Therefore, the load received by the step bracket 26 through the step 15 acts on the side frame 11 through the inner surface of the protector body 20. Therefore, the load received by step 15 is easily transmitted to the side frame 11. As a result, the step bracket 26 can support the step 15 in a state where the step 15 is resistant to a predetermined load.

[Configuration of reinforcement]
The structure of the reinforcement, particularly the cross-sectional shape perpendicular to the vehicle width direction in the reinforcement will be described in detail with reference to FIGS. In FIG. 4, for convenience of explaining the structure of the reinforcement 21 as viewed from above, the body cover portion 23 that covers the reinforcement 21 is not shown. On the other hand, in each of FIGS. 5 to 8 showing cross-sectional shapes of mutually different portions in FIG. 4, the body cover portion 23 is illustrated for convenience in explaining the width along the front-rear direction in the protector body 20.

  As shown in FIG. 4, the fastening member 25 and the step bracket 26 are located between the reinforcement 21 and the main body fixing portion 22 in the front-rear direction. The reinforcement 21 is a portion located at the protector intermediate portion 31 and includes a central side changing portion 21a including a portion where the amount of forward protrusion changes, and a portion located at the protector end portion 32 and protruding forward. And an end-side changing portion 21b including a portion where the amount changes.

  The reinforcement 21 includes an intermediate constant portion 21c that includes a portion that is sandwiched between the center-side changing portion 21a and the end-side changing portion 21b in the vehicle width direction and that has a substantially constant forward protrusion amount. Although a part of the intermediate constant portion 21c is located at the protector end portion 32, a portion where the intermediate constant portion 21c and the end-side changing portion 21b are connected is connected between the protector intermediate portion 31 and the protector end portion 32. The part and the position in the vehicle width direction may overlap.

  In the following, among the reinforcements 21, one part located in the center side changing part 21a, two parts located in the intermediate constant part 21c, lined up along the vehicle width direction, and the end side changing part The cross-sectional shape orthogonal to the vehicle width direction in one part located at 21b will be described.

FIG. 5 shows a cross-sectional shape of a first part which is a part located in the central side changing portion 21 a in the reinforcement 21.
As shown in FIG. 5, the reinforcement 21 includes a protruding portion 21p protruding forward in the center in the vehicle width direction and a flat portion 21f sandwiching the protruding portion 21p in the vertical direction. The protruding portion 21p protrudes more forward than the two flat portions 21f. The flat portion 21f extends along the main body fixing portion 22 in the vertical direction and extends along the vehicle width direction.

In the reinforcement 21, the distance between the flat portion 21f in the front-rear direction and the frontmost protruding surface of the protruding portion 21p is the protruding amount, and the protruding amount at the first portion is the first protruding amount that is a predetermined protruding amount. The amount P1. The first protrusion amount P1 is the minimum value of the protrusion amount of the protrusion portion 21p.
In the first part, the width of the protector body 20 along the front-rear direction is the intermediate part width W1.

  FIG. 6 shows a cross-sectional shape of a second part, which is a part close to the center C of the protector body 20 in the vehicle width direction, out of two parts located in the intermediate constant portion 21c in the reinforcement 21.

  As shown in FIG. 6, the protruding amount of the protruding portion 21p in the second portion is the second protruding amount P2 that is a predetermined protruding amount, and is larger than the first protruding amount P1 in the first portion, and the protruding portion. This is the maximum value of the protrusion amount of 21p.

In the reinforcement 21, the part located in the protector intermediate part 31 has a shape in which the size protruding forward in the cross section continuously decreases from the second part toward the first part. That is, in the center side changing portion 21a in the reinforcement 21, the forward protrusion amount in the cross section gradually decreases from the second protrusion amount P2 in the second portion toward the first protrusion amount P1 in the first portion.
In the second part, the width of the protector body 20 along the front-rear direction is an intermediate part width W1 that is equal to the first part.

  FIG. 7 shows a cross-sectional shape of a third portion, which is a portion close to the protector end portion 32 in the vehicle width direction, out of two portions located in the intermediate constant portion 21c in the reinforcement 21.

  As FIG. 7 shows, since the third part is a part located in the intermediate fixed part 21c, the third protrusion amount P3 that is the protrusion amount of the protrusion part 21p in the third part is the second protrusion in the second part. Mutually equal to the quantity P2. A fastening member 25 that fastens the bracket 13 to the main body fixing portion 22 is located between the third portion of the reinforcement 21 and the main body fixing portion 22. Therefore, the part which connects the protrusion part 21p and the flat part 21f in the vehicle width direction protrudes ahead compared with the 2nd site | part.

  Further, in the third part, the width along the front-rear direction in the protector body 20 is an intermediate width W1 that is mutually equal to the second part, and extends along the front-rear direction in the protector body 20 from the first part to the third part. The width is almost constant.

FIG. 8 shows a cross-sectional shape of a fourth part, which is a part located in the end-side changing portion 21 b in the reinforcement 21.
As shown in FIG. 8, in the fourth portion, the protruding portion 21p protrudes forward with a predetermined protruding amount, and the protruding amount in the fourth portion is the fourth protruding amount P4. The fourth protrusion amount P4 is smaller than the third protrusion amount P3 in the third portion. In addition, although the 4th protrusion amount P4 is larger than the 1st protrusion amount P1, the same magnitude | size as the 1st protrusion amount P1 may be sufficient, and it may be smaller than the 1st protrusion amount P1.

In the fourth region, the width of the protector body 20 along the front-rear direction is an end width W2, and the end width W2 is smaller than the intermediate width W1.
The part located in the protector end portion 32 of the reinforcement 21 has a shape in which the size protruding forward in the cross section continuously decreases in accordance with the width of the protector body 20 toward the end in the vehicle width direction. ing. That is, in the reinforcement 21, the protrusion amount at the protrusion portion 21p is changed from the third protrusion amount P3 in accordance with the continuous decrease of the width of the protector body 20 from the intermediate portion width W1 toward the end portion width W2. It gradually decreases toward the fourth protrusion amount P4.

  Further, in the fourth portion, the side surface that is a surface connecting the flat portion 21f and the surface protruding most forward in the protruding portion 21p forms an angle smaller than a right angle with the flat portion 21f. Therefore, the side surface in the fourth region is the side surface in the second portion or the side surface in the third portion, and has a gentler inclination with respect to the flat portion 21f than the side surface substantially orthogonal to the flat portion 21f. .

[Function of FUP]
The operation of the FUP 14 will be described with reference to FIGS. 9 and 10. In FIG. 10, for convenience of explanation, the schematic shape of the protector body 20 is indicated by a solid line, and each of the schematic shapes of the three types of bumpers 17 is indicated by a solid line, a one-dot chain line, and two points. It is indicated by one of the chain lines.

  As shown in FIG. 9, when the first force F1 is applied from the front of the FUP 14 to the vicinity of the center C of the protector body 20, the FUP 14 is caused by each of the two fastening members 25 arranged in the vehicle width direction. Are supported by two brackets 13 fastened to each other. Therefore, even if the reinforcement 21 is not located inside the protector body 20, the shape of the FUP 14 is difficult to change.

  Usually, a displacement part where the thickness or shape of the structure changes suddenly is a part where stress acting on the structure concentrates. When stress acts on a structure having such a displacement part, the structure is started from the displacement part. Things will be deformed. In this respect, two reinforcements 21 are located near the center C of the protector body 20 as a portion where the thickness of the structure changes. On the other hand, the end portions of these two reinforcements 21 have a recess 21d that suppresses such a portion where the thickness of the structure changes in the vertical direction or the vehicle width direction. Therefore, in the protector main body 20, it is suppressed that force concentrates on the site | part which overlaps with the edge part near the center C of the protector main body 20 in the reinforcement 21 in the front-back direction.

  Further, the reinforcement 21 has a portion protruding from the second protrusion amount P2 toward the first protrusion amount P1 toward the center C of the protector body 20 at the portion located in the protector intermediate portion 31 so that the protrusion 21 protrudes forward in the cross section. And has a continuously decreasing shape. Therefore, when the first force F1 acts on the FUP 14, the force is suppressed from concentrating on the end portion of the reinforcement 21 near the center C of the protector body 20.

  As a result, when the first force F1 is applied to the FUP 14, the FUP 14 can be prevented from changing its shape, and the FUP 14 can be prevented from being less resistant to the load received by the FUP 14.

  When the second force F2 is applied to the intermediate position between the center C of the protector body 20 and the end in the vehicle width direction from the front of the FUP 14, the second force F2 is fastened to the FUP 14 by the fastening member 25. It is transmitted to the bracket 13. Therefore, when the second force F2 acts on the FUP 14, the shape of the FUP 14 is difficult to change. In addition, the portion of the reinforcement 21 where the second force F2 is applied is located at the portion of the cross-sectional shape perpendicular to the vehicle width direction that protrudes forward, so that the resistance to the load of the FUP 14 is increased. Lowering is suppressed.

  When the third force F3 acts near the end of the protector body 20 in the vehicle width direction from the front of the FUP 14, the resistance to the load on the FUP 14 is enhanced by the reinforcement 21. In the reinforcement 21, the cross-sectional shape having a curved shape projecting forward is continuous along the longitudinal direction, and the size projecting forward does not change abruptly at the portion located at the protector end 32. Also in this respect, sudden changes in the thickness in the front-rear direction and the shape in the vehicle width direction of the reinforcement 21 that is a structure are suppressed. Therefore, even if the third force F3 acts on the FUP 14, the force concentrates on the protector body 20 at the position overlapping the end portion in the vehicle width direction at the protector end portion 32 of the reinforcement 21 in the front-rear direction. This makes it difficult to change the shape of the FUP 14. Therefore, it is possible to prevent the FUP 14 from being less resistant to the load received by the FUP 14.

  As shown in FIG. 10, there are a plurality of types of large vehicles such as trucks provided with the FUP 14, and the width along the vehicle width direction of the bumper 17 may be different for each type of vehicle. For example, the width in the vehicle width direction of the bumper 17 indicated by the solid line in FIG. 10, the width in the vehicle width direction of the bumper 17 indicated by the dashed-dotted line, and the width in the vehicle width direction of the bumper 17 indicated by the two-dot chain line in FIG. Are different from each other.

  Therefore, in the FUP 14, the width along the vehicle width direction of the protector body 20 needs to be different according to the width along the vehicle width direction of each bumper 17. For example, when the vehicle has a bumper 17 indicated by a solid line, an end 20e in the vehicle width direction of the protector main body 20 is an end 20e indicated by a solid line, and when the vehicle has a bumper 17 indicated by a one-dot chain line, the protector main body The end 20e of 20 is required to be an end 20e indicated by a one-dot chain line. Further, when the vehicle has the bumper 17 indicated by the two-dot chain line, the end 20e of the protector body 20 is required to be the end 20e indicated by the two-dot chain line.

  Here, in the FUP 14, in the extending portion 42 of the protector end portion 32, the cross-sectional shape orthogonal to the vehicle width direction is constant along the vehicle width direction. Therefore, when two or more types of protector main bodies 20 having different widths in the vehicle width direction in the protector main body 20 are formed by pressing as described above, the protector main body can be formed by any of the following methods. It is.

  That is, by using forming materials having different widths in the vehicle width direction, or by reducing the length of the protector body 20 in the vehicle width direction in the forming material after molding, the FUP 14 using the same mold is used. Molding is possible.

  Therefore, according to the FUP 14 having the protector body 20 described above, a plurality of types of FUPs 14 having different widths along the vehicle width direction can be formed using one mold. Therefore, the cost required for the equipment for manufacturing the FUP 14 can be reduced. As a result, the cost required for manufacturing the FUP 14 can be reduced.

As described above, according to the above-described embodiment, the effects listed below can be obtained.
(1) Since the portion closer to the end of the protector main body 20 has a smaller width in the front-rear direction, and the reinforcement 21 located inside the protector main body 20 is divided on both sides in the vehicle width direction of the protector main body 20, The weight of FUP 14 is reduced.

  (2) Since the center of the FUP 14 in the vehicle width direction is usually a part supported by the side frame 11 or the like, the resistance to the load received by the FUP 14 is not required even if the reinforcement 21 is not located inside the protector body 20. can get. On the other hand, both sides of the FUP 14 can withstand the load received by the FUP 14 by the reinforcement 21. In the reinforcement 21, the cross-sectional shape having a curved shape protruding forward is continuous along the longitudinal direction, and the size protruding forward does not change abruptly at the portion located at the protector end 32. The shape of is difficult to change. Therefore, in the FUP 14, it is possible to suppress a decrease in resistance to the load received by the FUP 14.

  (3) The protrusion size of the reinforcement 21 continuously decreases toward the center C in the vehicle width direction of the protector body 20 where the reinforcement 21 is not located. Therefore, the thickness of the reinforcement 21 can be prevented from changing suddenly between the portion where the reinforcement 21 is located and the portion where the reinforcement 21 is not located. Therefore, it is possible to suppress the force from being concentrated on a portion of the protector intermediate portion 31 that overlaps the end portion of the reinforcement 21, and thus it is possible to suppress the change in the shape of the FUP 14.

  (4) The depression 21d of the reinforcement 21 prevents the load from concentrating on the end of the reinforcement 21 and close to the center C of the protector body 20. Therefore, the FUP 14 can be prevented from changing the shape of the FUP 14 at a portion where the end of the reinforcement 21 near the center C of the protector body 20 is located.

  (5) Since the cross-sectional shape orthogonal to the vehicle width direction is constant along the vehicle width direction in the extending portion 42 of the protector end portion 32, a manufacturing method that can reduce the cost required for manufacturing the FUP 14 is provided. It can be employed as a manufacturing method.

  (6) The load received by the step bracket 26 through the step 15 acts on the side frame 11 through the inner surface of the protector body 20. Therefore, the load received by step 15 is easily transmitted to the side frame 11. Therefore, the step bracket 26 can support the step 15 in a state where the step 15 is resistant to a predetermined force.

The embodiment described above can be implemented with appropriate modifications as follows.
The step bracket 26 may be located outside the protector body 20 instead of inside the protector body 20. In this case, the step bracket should just be joined to the rear surface in the main body fixing | fixed part 22, for example. Even with such a configuration, the effects according to the above (1) to (5) can be obtained.

  -The cross-sectional shape orthogonal to the vehicle width direction of the extending part 42 may not be constant along the vehicle width direction. Even with such a configuration, the effects according to (1) to (4) and (6) described above can be obtained.

  -The reinforcement 21 does not need to have the hollow 21d recessed along the vehicle width direction in the edge part near the center C of the protector main body 20. As shown in FIG. Even with such a configuration, the effects according to the above (1) to (3), (5), and (6) can be obtained.

  -In the reinforcement 21, the cross section of the site | part located in the protector intermediate part 31 does not need to have a shape which decreases continuously toward the center C of the protector main body 20. FIG. In this case, for example, the reinforcement 21 may have a cross section of a portion located in the protector intermediate portion 31 having a constant shape toward the center C of the protector body 20. Even with such a configuration, the effects according to the above-described (1), (2), and (4) to (6) can be obtained.

  -The embodiment mentioned above and the modification can also be implemented in combination as appropriate. And if each of the protector main body 20 and the reinforcement 21 is the following structures, the effect according to (1) mentioned above at least can be acquired. In other words, the protector end portion 32 of the protector body 20 is continuously bent from the protector intermediate portion 31 and the distance from the protector intermediate portion 31 so that the portion where the distance from the protector intermediate portion 31 is larger is located rearward. It suffices to include a shape with a smaller width in the front-rear direction as the part with a larger value. In the reinforcement 21, the section having a curved shape protruding forward is continuous along the vehicle width direction, and the portion protruding at the protector end 32 has a size protruding forward in the vehicle width direction. It suffices to have a shape that continuously decreases in accordance with the width of the protector body 20 toward the end of the case.

  DESCRIPTION OF SYMBOLS 11 ... Side frame, 12 ... Front cross member, 13 ... Bracket, 14 ... FUP, 15 ... Step, 16 ... Bumper reinforcement, 17 ... Bumper, 20 ... Protector body, 20e ... End, 21 ... Reinforce, 21a ... Center Side change part, 21b ... End side change part, 21c ... Intermediate constant part, 21d ... Depression, 21f ... Flat part, 21p ... Projection part, 21r, 26r ... Rear face, 22 ... Body fixing part, 22f ... Front face, 23 ... Body Cover part, 24 ... Main body cap part, 25 ... Fastening member, 26 ... Step bracket, 31 ... Protector intermediate part, 32 ... Protector end part, 41 ... Curved part, 42 ... Extension part, C ... Center.

Claims (5)

A protector body having a box shape extending along the longitudinal direction as one direction;
Reinforce that has a plate shape extending along the longitudinal direction, and is fixed inside the protector body at each of both side portions sandwiching the center in the longitudinal direction of the protector body,
The protector body is
A protector intermediate portion having a linear shape extending along the longitudinal direction;
Two protector end portions sandwiching the protector intermediate portion in the longitudinal direction,
The protector end portion is continuously bent from the protector intermediate portion so as to be positioned rearward in the front-rear direction perpendicular to the longitudinal direction as the portion having a greater distance from the protector intermediate portion, and the protector intermediate portion Including a shape with a smaller width in the front-rear direction as a portion having a greater distance from
The reinforcement is
A section having a curved shape protruding forward is continuous along the longitudinal direction, and in a portion located at the end of the protector, the size protruding forward in the cross section is directed toward the end in the longitudinal direction. A front underrun protector having a shape that continuously decreases in accordance with the width of the protector body. In the reinforcement,
2. The front underrun protector according to claim 1, wherein the portion located at the intermediate portion of the protector has a shape in which a size protruding forward in the cross section continuously decreases toward the center of the protector body. The reinforcement is
The front underrun protector according to claim 1 or 2, wherein a recess that is recessed along the longitudinal direction is provided at an end portion of the protector body that is close to the center. The protector end is
A curved portion continuous from the protector middle portion;
An extending portion extending along the longitudinal direction from the curved portion,
The curved portion bends continuously from the protector intermediate portion so that the portion with a greater distance from the protector intermediate portion is located at the rear, and the portion with a greater distance from the protector intermediate portion has the front-rear direction. Having a shape with a small width,
The front underrun protector according to any one of claims 1 to 3, wherein the extending portion has a shape in which a cross-sectional shape orthogonal to the longitudinal direction is constant along the longitudinal direction. A step bracket located between the rear surface of the reinforcement and the inner surface of the protector body;
The step bracket is
The front under-run protector according to any one of claims 1 to 4, wherein a rear surface of the step bracket is joined to the protector body in a state of being in contact with the inner side surface of the protector body.