Bumper of a motor vehicle
A bumper of a motor vehicle includes a cross member which is disposed transversely to a side rail of a motor vehicle frame and has a U-shaped cross section formed by a wall and two legs extending from opposite ends of the wall Extending longitudinally in a direction of the cross member is a reinforcement member which has a T-shaped cross section and closes off a front end of the cross member.
1. A bumper of a motor vehicle, comprising:
a cross member disposed transversely to a side rail of a motor vehicle frame and having a U-shaped cross section formed by a wall and two legs which extend from the wall; and
a reinforcement member having a T-shaped cross section and extending in longitudinal direction of the cross member, said reinforcement member having a front end which defines a hollow double-wall head portion to close the cross member,
wherein the legs of the cross member are in touching relationship with the hollow double-wall head portion of the reinforcement member.
2. The bumper of claim 1 , wherein the cross member and the reinforcement member are made of different materials.
3. The bumper of claim 1 , wherein the cross member is a hot-formed steel sheet part.
4. The bumper of claim 1 , wherein the reinforcement member is made of light metal.
5. The bumper of claim 1 , wherein the reinforcement member is made of aluminum.
6. The bumper of claim 1 , wherein the reinforcement member is an extruded part.
7. The bumper of claim 1 , wherein the reinforcement member is made of steel.
8. The bumper of claim 7 , wherein the reinforcement member is a roll-formed part.
9. The bumper of claim 1 , wherein the wall of the cross member are disposed in confronting relationship to the motor vehicle, and the legs of the cross member face away from the motor vehicle, said reinforcement member having a center portion which projects into the cross member.
10. The bumper of claim 9 , wherein the hollow double-wall head portion has free ends which project laterally beyond the legs.
11. The bumper of claim 10 , wherein the hollow double-wall head portion of the reinforcement member has a vertical height which is greater than a vertical height of the cross member in an area between the legs.
12. The bumper of claim 1 , wherein the legs define an upper leg and a lower leg, said upper leg of the cross member defined by a length which is greater than a length of the lower leg.
13. The bumper of claim 9 , wherein the hollow double-wall head portion has in vertical orientation a curved configuration in the shape of an S to define an upper end and a lower end, wherein the lower end of the head portion is recessed with respect to the upper end in a direction of the motor vehicle.
14. The bumper of claim 9 , wherein the center portion of the reinforcement member is in touching relationship with the wall of the cross member.
15. The bumper of claim 14 , wherein the center portion of the reinforcement member and the wall of the cross member are joined to one another.
16. The bumper of claim 1 , wherein the cross member has a central length portion and end portions respectively connected to opposite ends of the length portion and having a wider configuration than the length portion, each said end portion having an attachment zone for attachment of a crash box.
17. The bumper of claim 1 , wherein the cross member and the reinforcement member are separate parts and coupled to one another.