JP7228134B2 - Underrun protector structure - Google Patents

Description

The present disclosure relates to underrun protector structures.

Patent Literature 1 describes an underrun protector. This underrun protector is provided with a main member configured in a tubular shape with a rectangular cross section and mounted on the front portion of the vehicle body frame along the vehicle width direction, and a reinforcing member disposed inside the main member. Mounting stays are attached to the rear surface of the main member at intervals in the vehicle width direction, and the stays are attached to the front portion of the vehicle body frame. The reinforcement member has a shape in which a long horizontal plate along the vehicle width direction is alternately folded up and down along the vehicle width direction, and is inserted into the main member through an opening at one end thereof. The reinforcing member has a shape in which plates whose width in the longitudinal direction of the vehicle is approximately equal to the internal width of the main member in the longitudinal direction of the vehicle are alternately folded back in a chevron shape along the width direction of the vehicle. is supported on the bottom surface of the interior of the main member, and the overall height is substantially equal to the vertical inner dimension of the interior of the main member. In addition, in the same publication, the inclined portion between the peak portion and the valley portion of the reinforcing member is arranged between the upper and lower bolts and nuts that fix the main member and the mounting stay. The states are illustrated.

Japanese Patent Application Laid-Open No. 2010-6278

In the underrun protector described in Patent Document 1, the inclined portion of the reinforcing member is arranged between the upper and lower bolts and nuts that fix the main member (protector body) and the mounting stay (bracket). When a load is applied to the underrun protector, the load applied from the front of the bracket in the protector body is applied to the slanted portion of the reinforcing member. That is, since the load input from the front of the bracket in the protector body is received by the linearly extending portion of the reinforcing member, the reinforcing member is deformed when the load is input to the underrun protector, and the protector body is deformed. It may get lost. Moreover, if another reinforcing member is additionally provided, the structure of the underrun protector may become complicated.

Accordingly, an object of the present disclosure is to provide an underrun protector structure capable of ensuring the strength of the underrun protector with a simple configuration.

In order to solve the above-mentioned problems, a first aspect of the present invention is fixed to a vehicle body frame via a bracket and extends in the vehicle width direction below one end of the vehicle body frame in the front-rear direction. An underrun protector structure for preventing an colliding object from crawling under a vehicle body frame from one side, comprising a protector body and a reinforcing member. The protector main body includes an inner vertical plate part that extends in the vehicle width direction while standing on the one side of the bracket and is fixed to the bracket, and a vehicle width an outer vertical plate portion extending in a direction; a protector upper plate portion connecting upper edges of the inner vertical plate portion and the outer vertical plate portion; and a protector lower plate connecting lower edges of the inner vertical plate portion and the outer vertical plate portion. A protector internal space extending in the vehicle width direction is defined by the inner vertical plate portion, the outer vertical plate portion, the protector upper plate portion, and the protector lower plate portion. The reinforcing member has a substantially L-shaped cross section and includes a first reinforcing plate portion and a second reinforcing plate portion. It is arranged in space and fixed to the protector body. The inner vertical plate portion has a supported region supported by the bracket from the other side in the front-rear direction. The bent portion of the reinforcing member is arranged on the one side of the supported region of the inner vertical plate portion, and extends from a position close to or in contact with the supported region of the inner vertical plate portion to a position close to or in contact with the outer vertical plate portion. .

In the above configuration, the reinforcing member arranged in the protector internal space of the protector main body is formed to have a substantially L-shaped cross section, and the bent portion of the reinforcing member is supported by the bracket of the inner vertical plate portion from the other side in the front-rear direction. It is arranged on one side of the supported region and extends from a position of the inner vertical plate portion that is adjacent to or in contact with the supported region to a position that is adjacent to or in contact with the outer vertical plate portion. Therefore, when a load is applied to the underrun protector, the load applied from the front surface of the bracket of the protector body is applied to the bending portion of the reinforcing member having a substantially L-shaped cross section. In this way, since the bending portion of the reinforcing member can receive the load input from the front of the bracket in the protector body, the deformation of the reinforcing member can be suppressed and the strength of the underrun protector can be ensured.

Therefore, according to the above configuration, the strength of the underrun protector can be achieved by a simple configuration in which the bending portion of the reinforcing member having a substantially L-shaped cross section is extended in the front-rear direction and arranged on one side of the supported region of the inner vertical plate portion. can be ensured.

A second aspect of the present invention is the underrun protector structure of the first aspect, wherein at least one of the first reinforcing plate portion and the second reinforcing plate portion has a length of the edge portion on the inner vertical plate portion side. The length of the edge portion on the side of the outer vertical plate portion is formed to be shorter than the length.

In the above configuration, at least one of the first reinforcing plate portion and the second reinforcing plate portion (hereinafter referred to as “one plate portion”) has an edge portion on the side of the inner vertical plate portion (an edge portion on the other side). The length of the edge portion on the side of the outer vertical plate portion (the edge portion on the one side) is formed to be shorter than the length of the . In this way, since the length of the edge portion on the outer vertical plate portion side of one of the plate portions is shorter than the length of the edge portion on the inner vertical plate portion side, the edge portion on the outer vertical plate portion side The weight of the reinforcing member can be reduced compared to the case where the length of the inner vertical plate portion is the same as the length of the edge portion on the side of the inner vertical plate portion. In addition, since the edge portion on the inner vertical plate portion side of one of the plate portions is lengthened, the load input from the one side (outer vertical plate portion side) to the one plate portion can be applied to a wide range of the inner vertical plate portion. can be transmitted to Therefore, the weight of the reinforcing member can be reduced, and the load input to the reinforcing member can be transmitted over a wide range of the inner vertical plate portion.

A third aspect of the present invention is the underrun protector structure of the first aspect or the second aspect, wherein the bent portion of the reinforcing member is spaced downward from the protector upper plate portion and the protector lower plate It is arranged at a position spaced upward from the part. The first reinforcing plate portion extends outward in the vehicle width direction from the bent portion at a position spaced downward from the protector upper plate portion and spaced upward from the protector lower plate portion. The second reinforcing plate portion extends upward or downward from the bent portion so as to be perpendicular to the first reinforcing plate portion. An end edge portion of the first reinforcing plate portion on the inner vertical plate portion side extends from the bent portion along the inner vertical plate portion to the outside of the supported region in the vehicle width direction and is welded to the inner vertical plate portion. .

In the above configuration, the bent portion of the reinforcing member is positioned downwardly away from the protector upper plate portion and upwardly away from the protector lower plate portion. The strength in the front-rear direction of the intermediate portion can be ensured by the bent portion of the reinforcing member.

Further, the end edge portion of the first reinforcing plate portion on the inner vertical plate portion side extends from the bent portion along the inner vertical plate portion to the outer side in the vehicle width direction of the supported region, and is welded to the inner vertical plate portion. be done. That is, the edge portion of the first reinforcing plate portion on the side of the inner vertical plate portion is welded to the inner vertical plate portion in a state of intersecting with the vehicle width direction outer end portion of the supported region of the inner vertical plate portion. . For this reason, for example, the end edge portion of the first reinforcing plate portion on the side of the inner vertical plate portion is linearly welded to the inner vertical plate portion, so that the outer end portion of the underrun protector in the vehicle width direction is attached to the above-described outer end portion of the underrun protector. When a load is input from one side (for example, during an offset collision), deformation of the protector body outside the bracket in the vehicle width direction toward the other side can be suppressed.

A fourth aspect of the present invention is the underrun protector structure of the third aspect, wherein the second reinforcing plate portion has an edge portion extending in the front-rear direction along the protector upper plate portion or the protector lower plate portion. have. The edge portion of the second reinforcing plate portion is welded to the protector upper plate portion or the protector lower plate portion.

In the above configuration, the edge portion of the second reinforcing plate portion is welded to the protector upper plate portion or the protector lower plate portion. Therefore, when a load is applied to the protector main body from one side, it is possible to prevent the protector upper plate portion or the protector lower plate portion from being deformed so as to bulge upward or downward.

According to the present disclosure, it is possible to ensure the strength of the underrun protector with a simple configuration.

1 is a side view of a vehicle to which an underrun protector according to one embodiment of the invention is applied; FIG. 2 is an enlarged view of a main part of FIG. 1; FIG. FIG. 3 is a front view of FIG. 2 viewed from the front; FIG. 3 is a perspective view of the underrun protector with the protector outer removed. FIG. 4 is a plan view of the main part of the underrun protector as viewed from above; 6 is a sectional view taken along the line VI-VI of FIG. 5; FIG.

An embodiment of the present invention will be described below with reference to the drawings. In each figure, FR indicates the front of the vehicle, UP indicates the upper side, and IN indicates the inner side in the vehicle width direction. Further, in the following description, the front-rear direction means the front-rear direction of the vehicle, and the left-right direction means the left-right direction when the vehicle faces forward.

As shown in FIG. 1, a vehicle 1 to which the underrun protector structure according to the present embodiment is applied is a cab-over type vehicle 1 in which a cab 2 is positioned generally above an engine (not shown). 3. A front underrun protector (underrun protector) 50 (hereinafter referred to as “FUP 50”) extending in the vehicle width direction is provided below the front end of the body frame 3 , and below the rear end of the body frame 3 . is provided with a rear underrun protector (underrun protector) 10 (hereinafter referred to as "RUP 10") extending in the vehicle width direction. The FUP 50 and the RUP 10 are respectively fixed to the vehicle body frame 3 via a pair of left and right brackets 11 (only the left bracket 11 is shown in FIG. 1), and are mounted on a counterpart vehicle such as a passenger car having a low vehicle height. To prevent an opponent vehicle from slipping under a vehicle body frame 3 when colliding with a collision object. Note that the FUP 50 and the RUP 10 are provided symmetrically on the front and rear sides of the vehicle 1 and have substantially the same configuration.

The vehicle body frame 3 includes a pair of left and right side members 4 extending in the front-rear direction on both sides in the vehicle width direction, and a cross member (not shown) extending in the vehicle width direction and connecting the left and right side members 4 to each other. .

As shown in FIGS. 1 to 3, the left and right brackets 11 are composed of upper frame side fixing portions 11a fixed to the left and right side members 4 and protector side fixing portions 11b fixed to the front surface 12 of the RUP 10. and extend downward from the left and right side members 4 . In this embodiment, the protector-side fixing portion 11b is formed in a plate shape that intersects with the front-rear direction, and is fixed to the front surface 12 of the RUP 10 in surface contact.

As shown in FIGS. 2 to 6, the RUP 10 includes a rectangular tubular protector body 13 extending in the vehicle width direction below the rear end of the vehicle body frame 3 (one end in the front-rear direction), and a protector body 13 . and a pair of left and right reinforcing members 17 arranged in an internal space 14 (hereinafter referred to as "protector internal space 14"; see FIG. 6). The reinforcing members 17 are provided symmetrically on the left and right sides of the vehicle 1, respectively, and have substantially the same configuration. Therefore, the left side will be described below, and the description of the right side will be omitted.

The protector main body 13 includes a protector inner 18 that is fixed to the protector-side fixing portions 11b of the left and right brackets 11 and extends in the vehicle width direction, and a protector outer that extends in the vehicle width direction behind the protector inner 18 and is joined to the protector inner 18. 19. Both ends of the protector main body 13 in the vehicle width direction are arranged outside the left and right brackets 11 in the vehicle width direction.

The protector inner 18 includes an inner vertical plate portion 20 that extends in the vehicle width direction while intersecting the front-rear direction, and an inner upper plate portion 20 that bends from the upper and lower edges of the inner vertical plate portion 20 and extends rearward to vertically face each other. A plate portion (protector upper plate portion) 21 and an inner lower plate portion (protector lower plate portion) 22 are integrally formed to form a member having a substantially U-shaped cross section. The inner vertical plate portion 20 stands up along the vertical direction. The inner upper plate portion 21 and the inner lower plate portion 22 extend substantially horizontally. The inner vertical plate portion 20 has left and right supported regions 43 that are supported from the front by the protector-side fixing portions 11b of the left and right brackets 11 . In FIG. 3 , to make the supported area 43 easier to understand, the area slightly inside the outer peripheral edge of the supported area 43 (the outer peripheral edge of the protector-side fixing portion 11b) is indicated by a dashed line 43 . That is, the supported region 43 of the inner vertical plate portion 20 is a region covered and supported from the front by the protector-side fixing portion 11b. The supported region 43 of the protector inner 18 is fastened and fixed to the protector-side fixing portion 11 b of the bracket 11 . In this embodiment, the protector inner 18 has a pair of left and right first reinforces 15 to be described later, and a pair of left and right second reinforces 16 to be described later.

The protector outer 19 includes an outer vertical plate portion 23 that extends in the vehicle width direction while intersecting the front-rear direction, and an outer vertical plate portion 23 that extends forward (on the other side in the front-rear direction) by bending from the upper and lower edges of the outer vertical plate portion 23 . An outer upper plate portion (protector upper plate portion) 24 and an outer lower plate portion (protector lower plate portion) 25 facing each other vertically are integrally formed to form a member having a substantially U-shaped cross section. The outer vertical plate portion 23 stands up along the vertical direction. The outer upper plate portion 24 and the outer lower plate portion 25 extend substantially horizontally. The front end portion of the outer upper plate portion 24 is joined to the rear end portion of the inner upper plate portion 21 so as to overlap the rear end portion of the inner upper plate portion 21 from above. The front end portion of the outer lower plate portion 25 is joined to the rear end portion of the inner lower plate portion 22 so as to overlap therewith from below. By joining the outer upper plate portion 24 and the outer lower plate portion 25 to the inner upper plate portion 21 and the inner lower plate portion 22, the protector inner 18 and the protector outer 19 are joined to form a tubular shape having a substantially rectangular cross section. A protector internal space 14 extending in the vehicle width direction is defined therein. With the protector inner 18 and the protector outer 19 joined together, the outer vertical plate portion 23 stands up at a position spaced rearward from the inner vertical plate portion 20 and faces the inner vertical plate portion 20 from behind. In addition, the inner upper plate portion 21 and the outer upper plate portion 24 (hereinafter referred to as “upper plate portions 21 and 24”) connect the upper edges of the inner vertical plate portion 20 and the outer vertical plate portion 23, The plate portion 22 and the outer lower plate portion 25 (hereinafter referred to as “lower plate portions 22 and 25”) connect the lower edges of the inner vertical plate portion 20 and the outer vertical plate portion 23 to each other.

As shown in FIGS. 4 and 6, the first reinforcement 15 includes an upper plate portion 15a extending in the vehicle width direction along the lower surface of the inner upper plate portion 21, and a front edge of the upper plate portion 15a bent downward. and a front plate portion 15b extending in the vehicle width direction along the rear surface of the inner vertical plate portion 20 and having a substantially L-shaped cross section. The front plate portion 15b of the first reinforcement 15 is formed to be longer on both sides in the vehicle width direction than the supported region 43 of the inner vertical plate portion 20, and crosses the supported region 43 of the inner vertical plate portion 20 in the vehicle width direction. and welded to the inner vertical plate portion 20 . The upper plate portion 15 a of the first reinforcement 15 is formed to have substantially the same length in the vehicle width direction as the front plate portion 15 b and is welded to the inner upper plate portion 21 . The first reinforcement 15 is fastened and fixed to the protector-side fixing portion 11 b of the bracket 11 together with the supported region 43 of the protector inner 18 .

The second reinforcement 16 includes a lower plate portion 16a extending in the vehicle width direction along the upper surface of the inner lower plate portion 22, and a front edge of the lower plate portion 16a bent upward to extend along the rear surface of the inner vertical plate portion 20. and a front plate portion 16b extending in the vehicle width direction. The front plate portion 16b of the second reinforcement 16 is formed to be longer on both sides in the vehicle width direction than the supported region 43 of the inner vertical plate portion 20, and crosses the supported region 43 of the inner vertical plate portion 20 in the vehicle width direction. and welded to the inner vertical plate portion 20 . The lower plate portion 16 a of the second reinforcement 16 is formed to have substantially the same length in the vehicle width direction as the front plate portion 16 b and is welded to the inner lower plate portion 22 . The second reinforcement 16 is fastened and fixed to the protector-side fixing portion 11 b of the bracket 11 together with the supported region 43 of the protector inner 18 . That is, the second reinforcement 16 is provided vertically symmetrically with the first reinforcement 15 .

As shown in FIGS. 3 to 6, the reinforcing member 17 is formed to have a substantially L-shaped cross section, which includes a horizontal reinforcing plate portion (first reinforcing plate portion) 17a and a vertical reinforcing plate portion (second reinforcing plate portion) 17b. , arranged in the protector internal space 14 and fixed to the protector body 13 . The bent portion 44 between the reinforcing horizontal plate portion 17a and the reinforcing vertical plate portion 17b is positioned behind the supported region 43 of the inner vertical plate portion 20 of the protector body 13 and substantially at the center of the supported region 43 in the vertical direction and vehicle width direction. and extends linearly in the front-rear direction (in this embodiment, the direction perpendicular to the inner vertical plate portion 20 and the outer vertical plate portion 23). That is, the bent portion 44 of the reinforcing member 17 is arranged at a position spaced downward from the upper plate portions 21 and 24 of the protector body 13 and spaced upward from the lower plate portions 22 and 25 . The bent portion 44 of the reinforcing member 17 extends from a position contacting the rear surface of the supported region 43 of the inner vertical plate portion 20 of the protector body 13 to a position close to the front surface of the outer vertical plate portion 23 .

The reinforcing horizontal plate portion 17a of the reinforcing member 17 is arranged at a position separated downward from the upper plate portions 21 and 24 of the protector body 13 and separated upward from the lower plate portions 22 and 25, and crosses the vertical direction. (In this embodiment, it extends substantially horizontally). The reinforcing horizontal plate portion 17a includes a front edge portion 27 extending in the vehicle width direction (the edge portion on the inner vertical plate portion side of the first reinforcing plate portion) 27, a rear edge portion 28 extending in the vehicle width direction, and a rear edge portion 28 extending in the vehicle width direction. It has an extending inner edge portion (bent portion 44), an outer edge portion 32 extending in the front-rear direction, and an inclined edge portion 31 inclined with respect to the front-rear direction, and is formed in a substantially pentagonal shape when viewed from above. (See Figure 5). The front end edge portion 27 of the reinforcing horizontal plate portion 17a extends from the front end of the bent portion 44 to the vehicle width direction outer edge portion (vehicle width direction outer end portion) 43a of the supported region 43 of the inner vertical plate portion 20. It extends in the vehicle width direction along the rear surface of the inner vertical plate portion 20 to the direction outside and is linearly welded to a predetermined welding area 29 (see FIG. 3) on the rear surface of the inner vertical plate portion 20 . The outer edge portion 32 of the reinforcing horizontal plate portion 17 a is arranged outside the vehicle width direction outer edge portion 43 a of the supported region 43 of the inner vertical plate portion 20 in the vehicle width direction. extending rearward from the side. A rear edge portion 28 of the reinforcing horizontal plate portion 17 a extends outward in the vehicle width direction from a rear end of the bent portion 44 at a position close to the front surface of the outer vertical plate portion 23 . The rear edge portion 28 is slightly spaced forward from the front surface of the outer vertical plate portion 23 . An outer end portion 30 in the vehicle width direction of the rear edge portion 28 of the reinforcing horizontal plate portion 17a is positioned more inward in the vehicle width direction than an outer end edge portion 32 of the reinforcing horizontal plate portion 17a. That is, the rear edge portion 28 of the reinforcing horizontal plate portion 17a is shorter than the front edge portion 27 in the vehicle width direction. The inclined edge portion 31 of the reinforcing horizontal plate portion 17a extends linearly forward in the vehicle width direction from the outer end portion 30 of the rear edge portion 28 of the reinforcing horizontal plate portion 17a. It continues to the rear end of edge 32 .

The reinforcing vertical plate portion 17b of the reinforcing member 17 stands up vertically from the bent portion 44 so as to intersect the vehicle width direction. The reinforcing vertical plate portion 17b includes a lower edge portion (bent portion 44) extending in the front-rear direction, a front edge portion (the edge portion on the inner vertical plate portion side of the second reinforcing plate portion) 33 extending in the vertical direction, and a , an upper edge portion (edge portion of the second reinforcing plate portion) 35 extending in the front-rear direction, and an inclined edge portion 38 inclined with respect to the front-rear direction. It is formed in a substantially pentagonal shape (see FIG. 6). The front edge portion 33 of the reinforcing vertical plate portion 17b extends from the front end of the bent portion 44 to the rear surface of the supported region 43 of the inner vertical plate portion 20 (in this embodiment, includes the rear surface of the front plate portion 15b of the first reinforcement 15). ) and is linearly welded to a predetermined welding area 36 (see FIG. 3) on the rear surface of the inner vertical plate portion 20 . A rear end edge portion 34 of the reinforcing vertical plate portion 17 b extends upward from a rear end of the bent portion 44 at a position close to the front surface of the outer vertical plate portion 23 . The rear edge portion 34 is slightly spaced forward from the front surface of the outer vertical plate portion 23 . The upper end edge portion 35 of the reinforcing vertical plate portion 17b extends in the front-rear direction along the lower surface of the inner upper plate portion 21 (including the lower surface of the upper plate portion 15a of the first reinforcement 15 in the present embodiment). It is linearly welded to a predetermined welding area 37 (see FIG. 5) on the lower surface of the plate portion 21 . The inclined edge portion 38 of the reinforcing vertical plate portion 17 b extends linearly forward from the upper edge portion 39 of the rear edge portion 34 and continues to the rear end of the upper edge portion 35 .

In the RUP 10 configured as described above, the reinforcing member 17 is arranged in the protector internal space 14 of the protector main body 13 with the bent portion 44 of the reinforcing member 17 having a substantially L-shaped cross section extending in the front-rear direction. The bent portion 44 of the reinforcing member 17 is arranged behind the supported region 43 of the inner vertical plate portion 20 of the protector body 13, and the rear surface of the supported region 43 of the inner vertical plate portion 20 (in the present embodiment, a It extends from a position contacting the front surface of the front plate portion 15 b of the 1 reinforcement 15 to a position close to the front surface of the outer vertical plate portion 23 . Therefore, when the other vehicle collides with the vehicle 1 from behind and a load is input to the RUP 10 from behind, the front of the protector-side fixing portion 11b of the bracket 11 of the protector body 13 (white arrow 40 in FIG. ) is input to the bent portion 44 of the reinforcing member 17 having a substantially L-shaped cross section. In this way, the load input from the front of the bracket 11 of the protector body 13 can be received by the bent portion 44 of the reinforcing member 17, so deformation of the reinforcing member 17 can be suppressed and the strength of the RUP 10 can be ensured. can be done.

Therefore, according to the present embodiment, the bending portion 44 of the reinforcing member 17 having a substantially L-shaped cross section is arranged in the back (one side) of the supported region 43 of the inner vertical plate portion 20 in a state of being extended in the front-rear direction. The strength of the RUP 10 can be ensured with such a structure.

Further, since the rear edge portion 28 of the reinforcing horizontal plate portion 17a of the reinforcing member 17 is shorter in the vehicle width direction than the front edge portion 27, the rear edge portion 28 is made the same length as the front edge portion 27. Therefore, the weight of the reinforcing horizontal plate portion 17a of the reinforcing member 17 can be reduced as compared with the case where the reinforcing horizontal plate portion 17a is formed in a substantially rectangular shape when viewed from above. Further, since the front edge portion 27 of the reinforcing horizontal plate portion 17a is longer than the rear edge portion 28, the load input to the reinforcing horizontal plate portion 17a of the reinforcing member 17 from the rear can be applied to the inner vertical plate portion 20 over a wide range. can be transmitted to Therefore, the load input to the reinforcing member 17 can be transmitted to a wide range of the inner vertical plate portion 20 while reducing the weight of the reinforcing member 17 . Further, since the rear end edge portion 34 of the reinforcement vertical plate portion 17b of the reinforcement member 17 is vertically shorter than the front end edge portion 33, the reinforcement member 17 can be made lightweight as in the above-described reinforcement horizontal plate portion 17a. In addition, the load input to the reinforcing member 17 can be transmitted to a wide range of the inner vertical plate portion 20 .

Further, the bent portion 44 of the reinforcing member 17 is arranged at a position spaced downward from the upper plate portions 21 and 24 of the protector body 13 and spaced upward from the lower plate portions 22 and 25 . For this reason, the vertical intermediate portion of the protector main body 13 (the vertical intermediate portion between the upper plate portions 21 and 24 and the lower plate portions 22 and 25 of the protector main body 13) having relatively low compressive strength in the front-rear direction. Strength can be ensured by the bent portion 44 of the reinforcing member 17 .

Further, the front end edge portion 27 of the reinforcing horizontal plate portion 17a of the reinforcing member 17 extends from the bent portion 44 side to the vehicle width direction outside of the vehicle width direction outer end edge portion 43a of the supported region 43 of the inner vertical plate portion 20. It extends in the vehicle width direction along the rear surface of the inner vertical plate portion 20 and is linearly welded to a predetermined welding area 29 (see FIG. 3) on the rear surface of the inner vertical plate portion 20 . That is, the front end edge portion 27 of the reinforcing horizontal plate portion 17a crosses the outer end edge portion 43a of the supported region 43 of the inner vertical plate portion 20 in the vehicle width direction. It is welded linearly in the direction. Therefore, when a load from the rear is input to the outer end of the RUP 10 in the vehicle width direction as indicated by the white arrow 41 in FIG. A region of the main body 13 outside the bracket 11 in the vehicle width direction is the position of the vehicle width direction outer edge portion 42 of the protector side fixing portion 11b of the bracket 11 (the vehicle width direction outer edge portion 43a of the supported region 43). It is possible to suppress bending deformation to the front.

An upper end edge portion 35 of the reinforcing vertical plate portion 17b of the reinforcing member 17 extends in the front-rear direction along the lower surface of the inner upper plate portion 21, and a predetermined welding region 37 (see FIG. 5) on the lower surface of the inner upper plate portion 21 (see FIG. 5). ) in a line. Therefore, when a load is input to the RUP 10 from the rear, the upper plate portions 21 and 24 of the protector body 13 are deformed so as to swell upward, and the upper plate portions 21 and 24 are deformed so as to dent downward. You can prevent it from happening.

In the present embodiment, the inner vertical plate portion 20 and the outer vertical plate portion 23 of the protector body 13 are erected along the vertical direction, but the present invention is not limited to this. Just do it. In addition, in the present embodiment, the lower plate portions 22, 25 and the upper plate portions 21, 24 of the protector body 13 are extended in a substantially horizontal direction. Just do it.

Further, in the present embodiment, the rear edge portion 28 of the reinforcing horizontal plate portion 17a and the rear edge portion 34 of the reinforcing vertical plate portion 17b of the reinforcing member 17 are spaced forward from the front surface of the outer vertical plate portion 23. It is not limited to this, and may be brought into contact with the front surface of the outer vertical plate portion 23 . In this case, the rear edge portion 28 of the reinforcing horizontal plate portion 17 a and the rear edge portion 34 of the reinforcing vertical plate portion 17 b of the reinforcing member 17 may be welded to the outer vertical plate portion 23 .

Further, in the present embodiment, the upper end edge portion 35 of the reinforcing vertical plate portion 17b of the reinforcing member 17 is linearly welded to the inner upper plate portion 21, but the present invention is not limited to this. The upper edge portion 35 may be spot-welded to the inner upper plate portion 21 .

Further, in this embodiment, the reinforcing vertical plate portion 17b of the reinforcing member 17 is extended upward from the bent portion 44, but may be extended downward from the bent portion 44. FIG. In this case, the edge portion on the lower side of the reinforcing vertical plate portion 17b (the edge portion extending along the lower plate portions 22 and 25 on the side opposite to the bent portion 44) is attached to the inner lower plate portion 22 and the outer lower portion of the protector body 13. It may be welded to at least one lower plate portion of the plate portion 25 .

Further, in the present embodiment, the reinforcing horizontal plate portion 17a of the reinforcing member 17 is arranged substantially horizontally, and the reinforcing vertical plate portion 17b is arranged along the vertical direction. With respect to the reinforcing member 17 according to the embodiment, the reinforcing member 17 may be fixed to the protector main body 13 while being rotated about the bent portion 44 . Even in this case, since the bent portion 44 of the reinforcing member 17 is arranged behind the supported region 43 of the inner vertical plate portion 20 and extends in the front-rear direction, the strength of the RUP 10 can be ensured with a simple configuration. . Also, the angle between the reinforcing horizontal plate portion 17a and the reinforcing vertical plate portion 17b is not limited to a right angle, and may be, for example, an obtuse angle or an acute angle.

Further, in the present embodiment, the front edge portion 27 of the reinforcing horizontal plate portion 17a of the reinforcing member 17 is positioned from the bent portion 44 side relative to the outer edge portion 43a of the supported region 43 of the inner vertical plate portion 20 in the vehicle width direction. Although it extends to the outside in the vehicle width direction, it is not limited to this.

Further, in the present embodiment, the front end edge portion 27 of the reinforcing horizontal plate portion 17a of the reinforcing member 17 is linearly welded to the inner vertical plate portion 20, but it is not limited thereto. It may be spot-welded at a plurality of positions spaced apart from each other. Further, in the present embodiment, the front end edge portion 33 of the reinforcing vertical plate portion 17b of the reinforcing member 17 is linearly welded to the inner vertical plate portion 20, but the present invention is not limited to this. It may be spot-welded at a plurality of positions spaced apart.

Further, in the present embodiment, the rear edge portion 28 of the reinforcing horizontal plate portion 17a of the reinforcing member 17 is made shorter in the vehicle width direction than the front edge portion 27, and the rear end of the reinforcing vertical plate portion 17b of the reinforcing member 17 is shorter than the front edge portion 27. Although the edge portion 34 is shorter in the vertical direction than the front edge portion 33, it is not limited to this. It should be shorter than Alternatively, the rear edge portions of both the reinforcing horizontal plate portion 17a and the reinforcing vertical plate portion 17b of the reinforcing member 17 may be the same as or longer than the front edge portion.

Further, in this embodiment, the front end side of the bent portion 44 of the reinforcing member 17 is attached to the rear surface of the inner vertical plate portion 20 of the protector body 13 (in this embodiment, the rear surface of the front plate portion 15b of the first reinforcement 15). Although they are brought into contact with each other, the present invention is not limited to this, and the front end side of the bent portion 44 may be brought close to the rear surface of the inner vertical plate portion 20 . Further, in the present embodiment, the rear end side of the bent portion 44 of the reinforcing member 17 is brought close to the front surface of the outer vertical plate portion 23 of the protector body 13, but this is not the only option. The rear end side may be brought into contact with the front surface of the outer vertical plate portion 23 .

In addition, in the present embodiment, the protector inner 18 is provided with the left and right first reinforcements 15 and the left and right second reinforcements 16, but the present invention is not limited to this. , the second reinforcement 16 may not be provided.

In addition, in the present embodiment, the protector main body 13 is formed in a cylindrical shape by joining two members (the protector inner 18 and the protector outer 19), but it is not limited to this, and one member, or It may be configured in a tubular shape with three or more members.

Although the present invention has been described above based on the above embodiments, the present invention is not limited to the contents of the above embodiments, and can be appropriately modified without departing from the scope of the present invention. In other words, all other embodiments, examples, operation techniques, etc. made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention.

For example, in the above embodiment, the underrun protector structure according to the present disclosure is applied to both the RUP 10 and the FUP 50, but it is not limited to this, and may be applied to only one of the RUP 10 and the FUP 50. .

The underrun protector structure according to the present disclosure can be widely applied to underrun protectors for various vehicles.

1: Vehicle 3: Body Frame 10: Rear Underrun Protector (Underrun Protector)
11: Bracket 13: Protector Body 14: Protector Internal Space 17: Reinforcement Member 17a: Reinforcement Horizontal Plate Portion (First Reinforcement Plate Portion)
17b: Reinforcing vertical plate portion (second reinforcing plate portion)
20: Inner vertical plate portion 21: Inner upper plate portion (protector upper plate portion)
22: Inner lower plate (protector lower plate)
23: Outer vertical plate portion 24: Outer upper plate portion (protector upper plate portion)
25: Outer lower plate portion (protector lower plate portion)
27: front edge of reinforcing horizontal plate portion (edge of first reinforcing plate portion on inner vertical plate portion side)
33: Front edge of reinforcing vertical plate portion (edge of second reinforcing plate portion on inner vertical plate portion side)
35: Upper edge of reinforcing vertical plate (edge of second reinforcing plate)
43: Supported area 44: Bent portion 50: Front underrun protector (underrun protector)

Claims (3)

It is fixed to the vehicle body frame via a bracket and extends in the vehicle width direction below one end of the vehicle body frame in the front-rear direction to prevent a collision object from slipping under the vehicle body frame from the one side of the vehicle. An underrun protector structure that prevents
an inner vertical plate portion that extends in the vehicle width direction while standing on the one side of the bracket and is fixed to the bracket; a protector upper plate portion connecting the upper edges of the inner vertical plate portion and the outer vertical plate portion; and connecting the lower edges of the inner vertical plate portion and the outer vertical plate portion. a protector main body having a protector lower plate portion, wherein the inner vertical plate portion, the outer vertical plate portion, the protector upper plate portion, and the protector lower plate portion define a protector internal space extending in the vehicle width direction;
The interior space of the protector is formed with a substantially L-shaped cross section having a first reinforcing plate portion and a second reinforcing plate portion, and the bent portions of the first reinforcing plate portion and the second reinforcing plate portion extend in the front-rear direction. a reinforcing member disposed in and fixed to the protector body,
The inner vertical plate portion has a supported region supported by the bracket from the other side in the front-rear direction,
The bent portion of the reinforcing member is arranged on the one side of the supported region of the inner vertical plate portion, and extends from a position adjacent to or in contact with the supported region of the inner vertical plate portion to the outer vertical plate portion. extending to a position of proximity or contact ,
The bent portion of the reinforcing member is arranged at a position spaced downward from the protector upper plate portion and spaced upward from the protector lower plate portion,
The first reinforcing plate portion extends outward in the vehicle width direction from the bent portion at a position spaced downward from the protector upper plate portion and spaced upward from the protector lower plate portion,
The second reinforcing plate portion extends upward or downward from the bent portion so as to be perpendicular to the first reinforcing plate portion,
An end edge portion of the first reinforcing plate portion on the side of the inner vertical plate portion extends from the bent portion along the inner vertical plate portion to an outer side in the vehicle width direction of the supported region, and extends from the inner vertical plate portion. welded against
An underrun protector structure characterized by: The underrun protector structure according to claim 1,
At least one of the first reinforcing plate portion and the second reinforcing plate portion is formed such that the length of the edge portion on the outer vertical plate portion side is shorter than the length of the edge portion on the inner vertical plate portion side. An underrun protector structure characterized by: The underrun protector structure according to claim 1 or claim 2,
The second reinforcing plate portion has an edge portion extending in the front-rear direction along the protector upper plate portion or the protector lower plate portion,
The edge portion of the second reinforcing plate portion is welded to the protector upper plate portion or the protector lower plate portion.
An underrun protector structure characterized by:

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