JP2009096386A - Rear bumper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear bumper capable of functioning as a step and suppressing a difference in manners of shock absorption attributed to a difference in collided locations in a vehicle width direction as much as possible without being accompanied with an increase in number of parts. <P>SOLUTION: The rear bumper 20 is provided with a bumper body 21 and an extended portion 23. The bumper body 21 has an upper plate portion 29 and is arranged over substantially all area in the vehicle width. The extended portion 23 integrally extends forward from the bumper body 21 and is fixed to the vehicle body side. The upper face of the upper plate portion 29 and an upper face of an extended portion 73 form a step face 61 to be a foothold. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rear bumper of a vehicle.

  In order to facilitate getting on and off from the rear of the vehicle, a vehicle equipped with an aluminum step body disposed substantially in the center of the vehicle width direction and a synthetic resin bumper side disposed on both sides of the step body. The rear bumper is known.

JP-A 63-43847 Japanese Utility Model Publication No. 63-160251

  However, the rear bumper is composed of three parts, a step body and two bumper sides, and has a large number of parts.

  In addition, since the step body and the bumper side are completely different in shape and material, if the collision position is different in the vehicle width direction, the mode of impact absorption is naturally different.

  Therefore, the present invention provides a rear bumper that also functions as a step and can suppress the difference in the mode of shock absorption caused by the difference in the collision position in the vehicle width direction as much as possible without increasing the number of parts. For the purpose.

  In order to achieve the above object, the present invention is a rear bumper that extends along the vehicle width direction at the rear of a vehicle, and includes a bumper body and an extension. The bumper body has an upper plate portion and is disposed over substantially the entire vehicle width. The extension portion extends integrally from the bumper body forward of the vehicle and is fixed to the vehicle body side, and the upper surface of the upper plate portion and the upper surface of the extension portion form a step surface that serves as a scaffold.

  In the above configuration, a step surface serving as a scaffold is formed by the upper surface of the upper plate portion of the bumper body and the upper surface of the extension portion integrally extending from the bumper body. That is, the rear bumper that is one component can also function as a step.

  In addition, since the bumper body is disposed over almost the entire vehicle width, it is possible to suppress the difference in the mode of shock absorption due to the difference in the collision position in the vehicle width direction as much as possible.

  Further, the upper plate portion may bulge upward as viewed from the side of the vehicle, and the upper surface of the extension portion may extend obliquely downward from the upper surface front end of the upper plate portion toward the front of the vehicle.

  In the above configuration, the upper plate portion bulges upward as viewed from the side of the vehicle, and the upper surface of the extension portion extends obliquely downward continuously from the front upper end of the upper plate portion. Alternatively, it easily flows down either to the rear and does not stay on the step surface. Therefore, there is no risk of freezing while rainwater or the like stays on the step surface under conditions where the outside air temperature at night is below freezing point, slipping due to freezing is prevented, and safety is improved.

  In addition, since the upper plate portion bulges upward as viewed from the side of the vehicle, an impact load is input from the rear of the vehicle to the rear bumper compared to the case where the upper plate portion extends in a straight line in the horizontal direction in the longitudinal direction of the vehicle. Then, the upper plate portion is easily bent and deformed so that the middle portion thereof moves upward. That is, the deformation mode of the upper plate portion can be stabilized when an impact load from the rear of the vehicle is input as compared with the case where the upper plate portion extends in a straight line in the horizontal direction.

  Further, the extension portion may partially extend from a part of the entire region of the bumper body in the vehicle width direction, or may extend from substantially the entire region of the bumper body in the vehicle width direction. When the extension portion extends from almost the entire region of the bumper body in the vehicle width direction, the occupant and the like can get on and off the vehicle at any position at the rear end of the loading platform in a vehicle such as a freight vehicle.

  According to the present invention, the rear bumper can function as a step without increasing the number of parts. Moreover, the difference in the aspect of shock absorption resulting from the difference in the collision position in the vehicle width direction can be suppressed as much as possible.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.

  1 is a rear view of a vehicle having a rear bumper according to a first embodiment of the present invention as viewed from the rear, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a side view of FIG. It is direction arrow sectional drawing. In the following description, the front-rear direction indicates the front-rear direction of the traveling direction of the vehicle, and the left-right direction indicates the left-right direction in the vehicle width direction when facing forward. In the figure, reference symbol FR indicates the front of the vehicle, reference symbol UP indicates the upper side, and reference symbol IN indicates the inner side in the vehicle width direction.

  As shown in FIGS. 1 to 3, the truck (vehicle) 1 includes a pair of chassis frames (vehicle bodies) 3 extending in the front-rear direction on both sides in the vehicle width direction, and along the vehicle width direction below the rear end of the chassis frame 3. The rear bumper 20 extends. The rear bumper 20 is disposed over almost the entire vehicle width of the truck 1. An upper end portion 5a of a stay 5 extending downward is fastened and fixed to the rear end portion 3a of each chassis frame 3 by a bolt 7 and a nut 9. A lower end portion 5b of the stay 5 is fixed to a front end of a bumper fixing bracket 11 extending rearward. The part 11a is fixed by welding or the like. Resin end caps 22 (not shown in FIG. 3) are attached to both ends of the rear bumper 20 in the vehicle width direction.

  As shown in FIG. 4, the bumper fixing bracket 11 has an upper mounting plate portion 13 and a horizontal mounting plate portion 15. The upper mounting plate portion 13 is disposed above the rear end portion 11b of the bumper fixing bracket 11, and the horizontal mounting plate portion 15 is disposed below the rear end of the upper mounting plate portion 13 and extends in the vertical direction. Bolt insertion holes are formed at predetermined positions of the upper mounting plate portion 13 and the horizontal mounting plate portion 15, and the upper surface 13 a of the upper mounting plate portion 13 and the rear surface 15 a of the horizontal mounting plate portion 15 are respectively rear bumpers. 20 mounting surfaces.

  The rear bumper 20 is formed by cutting a long member, which is an extruded product of an aluminum material, to a desired length and performing post-processing such as drilling at a predetermined location. For this reason, the rear bumper 20 has the same cross-sectional shape in the longitudinal direction (vehicle width direction) except for a post-processed portion. The rear bumper 20 has a bumper body 21 and an extension 23. The bumper body 21 is set to a dimension and shape necessary for functioning as a shock absorbing member and functioning as a rear side of a step at the time of a rear collision, and the extension portion 23 has a dimension and shape necessary for functioning as a front side of the step. Is set.

  The bumper main body 21 includes a peripheral wall 25 that forms a closed cross section, and a plurality of partition walls 27 that divide the internal space of the peripheral wall 25 into a plurality of closed spaces 26. The upper region of the peripheral wall 25 constitutes the upper plate portion 29, and the front region of the peripheral wall 25 constitutes the front plate portion 31. The front plate portion 31 extends downward from the front end 29 a of the upper plate portion 29. A bolt insertion hole (not shown) is formed in the lower end portion of the front plate portion 31.

  The extension portion 23 includes an upper extension plate portion 33, a lower extension plate portion 35, an intermediate partition wall 37, and a front end wall 39. The upper extension plate portion 33 extends forward from the front end 29 a of the upper plate portion 29 of the bumper body 21. The lower extension plate portion 35 extends forward from the front surface 31 a of the front plate portion 31 of the bumper body 21 below the upper extension plate portion 33. Bolt insertion holes (not shown) are formed in the front end portion of the upper extension plate portion 33 and the front end portion of the lower extension plate portion 35, respectively. The front end wall 39 connects the rear end of the upper extension plate portion 33 and the rear end of the lower extension plate portion 35, and the intermediate partition wall 37 is slightly rearward of the bolt insertion hole and the upper extension plate portion 33 and the lower extension plate portion. 35 is connected.

  The rear bumper 20 has an upper bolt in a state where the lower surface 35a of the lower extension plate portion 35 is in contact with the upper surface 13a of the upper mounting plate portion 13 and the front surface 31a of the front plate portion 31 is in contact with the rear surface 15a of the lateral mounting plate portion 15. 41 is inserted through the bolt insertion holes of the upper extension plate portion 33, the lower extension plate portion 35, and the upper mounting plate portion 13 to screw the upper nut 43, and the lower bolt 45 is connected to the front plate portion 31 and the lateral mounting plate portion 15. Each of the bolt insertion holes is inserted into the lower nut 47 and screwed into the lower nut 47 to be fastened and fixed to the rear end portion 11 b of the bumper fixing bracket 11.

  The upper surface of the upper plate portion 29 and the upper surface of the upper extension plate portion 33 form a step surface 61 that serves as a scaffold when an occupant or the like goes up to the loading platform. The upper plate portion 29 and the upper extension plate portion 33 have a gentle curved surface shape that bulges upward as viewed from the side of the vehicle as a whole. In other words, the upper plate portion 29 bulges upward as viewed from the side of the vehicle, and the upper surface of the upper extension plate portion 33 (extension portion 23) extends obliquely downward continuously from the front end of the upper surface of the upper plate portion 29. .

  On the step surface 61, a plurality of linear protrusions 63 extending in the vehicle width direction are arranged in parallel at a predetermined interval in the front-rear direction. These protrusions 63 prevent the step surface 61 from slipping.

  A straight groove 49 extending along the vehicle width direction is formed at the upper rear end corner of the bumper main body 21, and an edge member 51 having an anti-slip function and a phosphorescent function is formed in the groove 49 by an adhesive or the like. It is fixed by. The nightlight rear bumper 20 (edge material 51) can be visually recognized by the phosphorescent function of the edge material 51, and the driver of the vehicle behind can easily recognize the rear end position of the truck 1.

  According to the rear bumper 20 of the present embodiment, the step surface 61 serving as a scaffold is formed by the upper surface of the upper plate portion 29 of the bumper main body 21 and the upper surface of the upper extension plate portion 33 extending integrally from the bumper main body 21. That is, the rear bumper 20, which is one component, can function as a step.

  In addition, since the bumper body 21 is disposed over almost the entire vehicle width, the difference in the mode of shock absorption caused by the difference in the collision position in the vehicle width direction can be suppressed as much as possible, and stable shock absorption can be performed. .

  Further, the upper plate portion 29 bulges upward as viewed from the side of the vehicle, and the upper surface of the upper extension plate portion 33 continuously extends obliquely downward from the front end of the upper surface of the upper plate portion 29. Water easily flows down either forward or backward and does not easily stay on the step surface 61. Therefore, there is no risk of freezing while rainwater or the like stays on the step surface 61 under conditions where the outside air temperature at the nighttime is below freezing point, slipping due to freezing is prevented, and safety is improved.

  Further, since the upper plate portion 29 bulges upward as viewed from the side of the vehicle, an impact load is applied to the rear bumper 20 from the rear of the vehicle as compared with the case where the upper plate portion extends in a straight line in the horizontal direction in the vehicle front-rear direction. Is input, the upper plate portion 29 is easily bent and deformed so that the middle portion thereof moves upward. That is, the deformation mode of the upper plate portion 29 can be stabilized when an impact load from the rear of the vehicle is input as compared with the case where the upper plate portion extends in a straight line in the horizontal direction.

  Moreover, since the upper extension board part 33 is extended from the whole area | region of the vehicle width direction of the bumper main body 21, the passenger | crew etc. can board / exit favorably in any place of a loading platform rear end.

  Next, a second embodiment will be described based on FIG. Since this embodiment is different from the first embodiment in the configuration of the upper plate portion and the extension portion, the upper plate portion and the extension portion will be described, and the other components are denoted by the same reference numerals as those in the first embodiment. The description is omitted.

  As shown in FIG. 5, the extension part 73 of this embodiment is comprised with the sheet-like member of 1 sheet. Further, the upper plate portion 71 is linearly inclined upward from the rear end toward the front, bent at the intermediate portion 71b, and linearly inclined downward. The extension portion 73 is inclined linearly from the front end 71a of the upper plate portion 71 toward the front. That is, the upper surface of the upper plate portion 71 and the upper surface of the extension portion 73 form a mountain-shaped step surface 75 constituted by two inclined surfaces that bend at the intermediate portion 71 b of the upper plate portion 71. Also in this case, similarly to the first embodiment, the upper plate portion 71 bulges upward as viewed from the side of the vehicle, and the upper surface of the extension portion 73 extends obliquely downward continuously from the front end of the upper surface of the upper plate portion 71. ing.

  Next, a third embodiment will be described based on FIG. Since this embodiment also differs in the structure of an upper board part and an extension part from 1st Embodiment, it demonstrates an upper board part and an extension part, and attaches | subjects the code | symbol same as 1st Embodiment about another structure. The description is omitted.

  As shown in FIG. 6, the extension portion 83 of the present embodiment is also composed of a single plate-like member as in the second embodiment. However, unlike the second embodiment, the upper plate portion 81 extends linearly in a substantially horizontal direction from the rear end toward the front, and the extension portion 83 is substantially horizontal continuously from the front end 81a of the upper plate portion 81. It extends in a straight line in the direction. That is, the upper surface of the upper plate portion 81 and the upper surface of the extension portion 83 form a substantially flat step surface 85. In this case, unlike the first and second embodiments, the upper plate portion 81 does not bulge upward when viewed from the side of the vehicle, and the upper surface of the extension portion 83 is obliquely downward from the upper front end of the upper plate portion 81. It does not extend.

  The above-described embodiment is an example of the present invention. For example, the bumper body 21 may partially extend from a part (for example, a central part) instead of the entire region in the vehicle width direction. That is, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the above-described embodiment as long as the technical idea of the present invention is not deviated. Of course.

  The present invention is applicable to various vehicle rear bumpers.

It is the rear view which looked at the vehicle which has the rear bumper of 1st Embodiment of this invention from back. It is a top view of FIG. It is a side view of FIG. FIG. 4 is a sectional view taken in the direction of arrows IV-IV in FIG. 1. It is a sectional side view of the rear bumper of 2nd Embodiment of this invention. It is a sectional side view of the rear bumper of 3rd Embodiment of this invention.

Explanation of symbols

1: Truck (vehicle)
3: Chassis frame (car body)
20: Rear bumper 21: Bumper body 23: Extension part 29: Upper plate part 61: Step surface 71: Upper plate part 73: Extension part 75: Step surface 81: Upper plate part 83: Extension part 85: Step surface

Claims (2)

A rear bumper extending along the vehicle width direction at the rear of the vehicle,
A bumper body that has an upper plate portion and is arranged over substantially the entire vehicle width;
An extension portion that extends integrally from the bumper body toward the front of the vehicle and is fixed to the vehicle body side, and
The rear bumper, wherein the upper surface of the upper plate portion and the upper surface of the extension portion form a step surface serving as a scaffold. The rear bumper according to claim 1,
The upper plate portion bulges upward as viewed from the side of the vehicle,
The rear bumper, wherein an upper surface of the extension portion extends obliquely downward from a front end of the upper surface of the upper plate portion toward the front of the vehicle.

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