Abstract:
A collision energy absorption structure of a vehicle may include a bumper back beam that may be disposed in a traverse direction of the vehicle, a side member that may be disposed at a predetermined distance from the bumper back beam in a longitudinal direction of the vehicle, and a crush box, of which a first side protrudes in a front direction of the bumper back beam and of which a second side may be interposed between the bumper back beam and the side member.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims priority to Korean Patent Application No. 10-2012-0077395 filed in the Korean Intellectual Property Office on Jul. 16, 2012, the entire contents of which is incorporated herein for all purposes by this reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a collision energy absorption structure of a vehicle that improves a collision energy absorption rate and overall stability of a vehicle by reducing bending of a side member. 
     2. Description of Related Art 
     Generally, a crush box is used to prevent damage to a vehicle through plastic deformation when a front side of a vehicle is collided at a low speed. 
     Further, the crush box is disposed at a front side or a rear side, and absorbs an impact that is generated when a vehicle is impacted with an obstacle to improve the stability of an occupant and minimize deformation of a vehicle body. 
       FIG. 1  is an overall top plan view of a collision energy absorption structure of a vehicle. 
     Referring to  FIG. 1 , a vehicle includes a bumper back beam  100 , a crush box  120 , and a side member  110 , wherein the bumper back beam  100  is disposed at the front or the rear of a vehicle and the crush box  120  is interposed between the bumper back beam  100  and the side member  110 . 
     The bumper back beam  100  collides with a barrier  102  of a front side of a vehicle first, wherein the impact energy that is applied to the bumper back beam  100  is absorbed by the crush box  120  to be transferred to the side member  110 . 
     Meanwhile, as shown in the drawing, a central portion of the bumper back beam  100  has a convex shape in a front side of the vehicle body, both end sides thereof are bent in a rear side of the vehicle body, and therefore the central portion of the bumper back beam  100  collides with the barrier  102  before the front side of the vehicle collides. 
     Accordingly, the bumper back beam  100  of which the central portion thereof is impacted with the barrier  102  can bend the side member  110  in an outside direction, and therefore the deformation of the vehicle is increased and the collision energy absorption efficiency of the crush box  120  is deteriorated. 
     The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. 
     BRIEF SUMMARY 
     Various aspects of the present invention are directed to providing a collision energy absorption structure having advantages of reducing overall deformation of a side member of a vehicle and improving collision energy absorption efficiency of a crush box when a vehicle collides with an obstacle. 
     In an aspect of the present invention, a collision energy absorption structure of a vehicle may include a bumper back beam that is disposed in a traverse direction of the vehicle, a side member that is disposed at a predetermined distance from the bumper back beam in a longitudinal direction of the vehicle, and a crush box, of which a first side protrudes in a front direction of the bumper back beam and of which a second side is interposed between the bumper back beam and the side member. 
     Both distal end portions of the bumper back beam are bent in a rear direction of the vehicle, wherein a central portion of the bumper back beam is shaped convex in a front direction of the vehicle, and wherein the crush box is coupled to the both distal end portions of the bumper back beam. 
     A crush plate is connected to a rear end portion of the crush box and is mounted on the side member. 
     A box front end surface of the crush box that protrudes from a front side of the bumper back beam is positioned at a level that corresponds to a back beam front end surface that is convex at a central portion of the bumper back beam. 
     A penetrating groove is formed on the crush box and the bumper back beam penetrates the crush box through the penetrating groove and is coupled thereto. 
     The penetrating groove is opened in an upper direction of the crush box such that the bumper back beam is mounted downwards onto a lower surface of the crush box. 
     The crush box may include an outer member that is disposed in an outer side of the vehicle body, and an inner member that is connected to the outer member and is disposed in an inner side of the vehicle body, wherein an incision groove is respectively formed on the outer member and the inner member to form the penetrating groove. 
     The outer member and the inner member are disposed in front of the bumper back beam on a level that corresponds to a back beam front end surface that is convex at a central portion of the bumper back beam. 
     As described above, a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention reduces overall deformation of a side member of a vehicle and improves collision energy absorption efficiency of a crush box when a vehicle collides with an obstacle. 
     The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an overall top plan view of a collision energy absorption structure of a vehicle. 
         FIG. 2  is an overall top plan view of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
         FIG. 3  is a partial perspective view of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
         FIG. 4  is a partial exploded perspective view of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
         FIG. 5  is a perspective view of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
         FIG. 6  is a graph showing effectiveness of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
     
    
    
     It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. 
     In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that the present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims. 
     An exemplary embodiment of the present invention will hereinafter be described in detail with reference to the accompanying drawings. 
       FIG. 2  is an overall top plan view of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 2 , a vehicle includes a bumper back beam  100 , a crush box  120 , and a side member  110 , wherein the bumper back beam  100  is disposed at the front or the rear of the vehicle. 
     Further, the crush box  120  is interposed between the bumper back beam  100  and the side member  110 , and the crush box  120  protrudes in a front side of the bumper back beam  100 . 
     The barrier  102  simultaneously collides with a back beam front end surface  210  of the bumper back beam  100  and a box front end surface  200  of the crush box  120 , and a part of the impact energy that is applied to the bumper back beam  100  and the crush box  120  is absorbed by the crush box  120  and the other part thereof is transferred to the side member  110 . 
     As shown in the drawings, the central portion of the bumper back beam  100  is convex in a front side of the vehicle body and both end sides thereof are bent in a rear side of the vehicle body. 
     Further, the crush box  120  protrudes at both sides in a front side direction of the bumper back beam  100  to effectively absorb the impact energy of the barrier  102 . 
     Accordingly, when the front side of the vehicle is collided, the bending or the opening of the side member  110  is prevented beforehand, and thus the deformation of the vehicle body is reduced and the collision energy absorption efficiency of the crush box  120  is improved. 
       FIG. 3  is a partial perspective view of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 3 , both end sides of the bumper back beam  100  respectively penetrate the crush box  120 , and the crush box  120  is welded to the bumper back beam  100 . 
     A crush plate  300  is joined to the rear end portion of the crush box  120 , and the crush plate  300  is fixed on the front end portion of the side member  110 . 
     One side of the crush box  120  that is formed between the bumper back beam  100  and the crush plate  300  is integrally formed with the other side of the crush box  120  that protrudes in a front side direction of the bumper back beam  100 . 
       FIG. 4  is a partial explode perspective view of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 4 , the crush box  120  includes an inner member  120   a  and an outer member  120   b , the inner member  120   a  is disposed at an inner side of a vehicle body, the outer member  120   b  is disposed at an outer side of a vehicle body, and the inner member  120   a  is welded to the outer member  120   b.    
     A first incision groove  400   a  that the bumper back beam  100  penetrates across is formed on the inner member  120   a , and a second incision groove  400   b  that the bumper back beam  100  penetrates across is formed on the outer member  120   b  to correspond to the first incision groove  400   a.    
     The inner member  120   a  is welded to the outer member  120   b , and the first incision groove  400   a  and the second incision groove  400   b  form one penetrating groove  400   a  and  400   b  together. Further, the inner member  120   a  and the outer member  120   b  are simultaneously joined to the crush plate  300 . 
     The bumper back beam  100  is moved downward to be securely assembled on the crush box  120  in an exemplary embodiment of the present invention. Further, a lower portion of the crush box  120  supports the bumper back beam  100  upward to secure the structure with which the bumper back beam  100  is engaged with the crush box  120 . 
     Also, the height and the interior diameter of the penetrating groove  400   a  and  400   b , the height and the interior diameter of the first incision groove  400   a , and the height and the interior diameter of the second incision groove  400   b  can be varied according to the design specifications in an exemplary embodiment of the present invention. 
     Further, it is described that the bumper back beam  100  penetrates the crush box  120 , but it can also be described that the crush box  120  penetrates the bumper back beam  100  in an exemplary embodiment of the present invention. 
       FIG. 5  is a perspective view of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
     The inner member  120   a , the outer member  120   b , the crush plate  300 , and the bumper back beam  100  as constituent elements of  FIG. 4  are all joined to complete the assembled product as shown in  FIG. 5 . Further, the assembled product is connected to a vehicle body by mounting the crush plate  300  on a front end portion of the side member  110 . 
       FIG. 6  is a graph showing effectiveness of a collision energy absorption structure of a vehicle according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 6 , while a vehicle is collided, the former stage acceleration is increased and the latter stage acceleration is reduced rather than as in a conventional case, and the impact acceleration becomes uniform, and this result signifies that the impact energy is uniformly absorbed during the collision. 
     For convenience in explanation and accurate definition in the appended claims, the terms “upper”, “lower”, “inner” and “outer” are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. 
     The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.