Bumper beam assembly for vehicle

A bumper beam assembly for a vehicle comprising:

• a back beam disposed inside a vehicle bumper, both distal ends of the back beam being oriented in a lateral direction of a main body of the vehicle;
• crash boxes coupled to one side of the back beam, the crash boxes protruding from the both distal ends of the back beam toward the bumper;
• and
• back beam stays integrally coupled to the other side of the back beam, the back beam stays protruding from the both distal ends of the back beam toward an inside of the vehicle, in a direction opposite to a direction in which the crash boxes protrude;
• wherein the back beam includes:
• back beam holes in the both distal ends thereof, the back beam holes being open toward the inside and an outside of the vehicle;
• and
• base surfaces each formed in an inner circumference of the respective back beam holes, wherein each of the crash boxes are seated on and coupled to a corresponding base surface respectively;
• wherein each of the back beam stays is connected to a corresponding base surface respectively;
• wherein each of the back beam stays has a C-shaped cross section, with a portion thereof being connected to a respective one of the base surfaces;
• and
• wherein the back beam stay is open in a direction toward the outside of the vehicle through the back beam hole but is closed in a direction toward the inside of the vehicle to form a crash-absorbing space defined therein.