Vehicle bumper reinforcement beam

Abstract

A battery tray for supporting batteries at a lower portion of a vehicle frame includes a floor plate and a perimeter wall disposed around the of the floor plate to substantially surround a containment area for storing vehicle battery cells. The perimeter wall includes a tubular member that extends along a periphery of the floor plate to form a perimeter wall around a containment area for storing vehicle battery cells. The perimeter wall is attached at an upper surface of the floor plate, such that the containment area may be generally bounded horizontally by the perimeter wall and at the bottom by the floor plate.

What is claimed is: 
     
         1 . A bumper reinforcement beam comprising:
 a first tubular member having a first transverse cross-sectional shape continuously along a length of the first tubular member; and   a second tubular member having a second transverse cross-sectional shape continuously along a length of the second tubular member,   wherein in the first tubular member has a first wall section fixedly attached at a second wall section of the second tubular member along the length of the second tubular member to form a stacked tubular arrangement.   
     
     
         2 . The bumper reinforcement beam of  claim 1 , wherein the second tubular member comprising a metal sheet with edge portions welded together to form a weld seam along the length of the second tubular member. 
     
     
         3 . The bumper reinforcement beam of  claim 1 , wherein the first and second tubular members each comprise a metal sheet with edge portions welded together to enclose the respective first and second tubular members along the respective lengths. 
     
     
         4 . The bumper reinforcement beam of  claim 1 , wherein the second tubular member comprises a single hollow beam having a rectangular cross-sectional shape. 
     
     
         5 . The bumper reinforcement beam of  claim 1 , wherein the first and second tubular members each comprise an inner wall section and an outer wall section that are generally aligned with each other along the length of the first tubular member. 
     
     
         6 . The bumper reinforcement beam of  claim 1 , wherein the first and second tubular members each comprise an inner wall section, an outer wall section, an upper wall section, and a lower wall section that form a rectangular cross-sectional shape, and wherein the lower wall section of the first tubular member is attached along the upper wall section of the second tubular member. 
     
     
         7 . The bumper reinforcement beam of  claim 1 , wherein the first tubular member is welded to the second tubular member. 
     
     
         8 . The bumper reinforcement beam of  claim 1 , wherein the first tubular member is attached to the second tubular member with an adhesive layer that securely bonds the first and second members together. 
     
     
         9 . A bumper reinforcement beam comprising:
 an upper member having a first metal sheet formed with a tubular shape along a length of the upper member; and   an lower member having a second metal sheet formed with a tubular shape along a length of the lower member,   wherein in the upper member is fixedly attached along the length of the lower member to form a stacked tubular arrangement.   
     
     
         10 . The bumper reinforcement beam of  claim 9 , wherein the upper and lower members each comprise an inner wall section, an outer wall section, an upper wall section, and a lower wall section, and wherein the lower wall section of the upper member is attached along the upper wall section of the lower member. 
     
     
         11 . The bumper reinforcement beam of  claim 9 , wherein the upper member comprises a first transverse cross-sectional shape continuously along the length of the upper member, and wherein the lower member comprises a second transverse cross-sectional shape continuously along the length of the lower member. 
     
     
         12 . The bumper reinforcement beam of  claim 11 , wherein at least one of the first transverse cross-sectional shape or the second transverse cross-sectional shape comprises a channel rib disposed along a front wall section of the respective upper or lower member. 
     
     
         13 . The bumper reinforcement beam of  claim 11 , wherein the lower member having a second transverse cross-sectional shape continuously along the length of the lower member. 
     
     
         14 . The bumper reinforcement beam of  claim 13 , wherein the first and second transverse cross-sectional shapes are the same. 
     
     
         15 . The bumper reinforcement beam of  claim 9 , wherein the upper and lower members each comprise a metal sheet with edge portions welded together to enclose the respective upper and lower members along the respective lengths. 
     
     
         16 . The bumper reinforcement beam of  claim 9 , wherein the upper and lower members each comprise an inner wall section and an outer wall section that are generally aligned with each other along the lengths of the upper and lower member. 
     
     
         17 . The bumper reinforcement beam of  claim 9 , wherein the upper member is welded to the lower member. 
     
     
         18 . The bumper reinforcement beam of  claim 9 , wherein the upper member is attached to the lower member with an adhesive layer that securely bonds the upper and lower members together. 
     
     
         19 . A bumper reinforcement beam comprising:
 a first member having a first metal sheet formed to have a first transverse cross-sectional shape continuously along a length of the first member; and   a second member having a second metal sheet formed to have a second transverse cross-sectional shape continuously along a length of the second member,   wherein in the first member has a first wall section fixedly attached at a second wall section of the second member along the length of the second member, and   wherein the first and second members form a stacked arrangement with wall sections of the first and second members defining an front face of the bumper reinforcement beam.   
     
     
         20 . The bumper reinforcement beam of  claim 19 , wherein the first member is attached to the second member with welding or an adhesive layer.