Bumper bar
The invention provides devices, systems and methods for absorbing and distributing an impact of a vehicle with another object. The force is absorbed by a bumper bar that extends from the vehicle. The bumper bar distributes the force between a fuel container and a frame or bracket in which the fuel container is attached to the vehicle.
1. A method of absorbing a horizontal impact force generated by a collision between a vehicle and an object, the method comprising
installing on the vehicle a bracket and one or more straps configured to rigidly hold a fuel container during the collision, wherein the one or more straps secure the fuel container to the bracket, wherein a portion of the bracket is positioned at a front or rear of the fuel container, wherein the bracket is connected to a bumper bar disposed along a longitudinal axis of the fuel container, and the bumper bar is configured to transmit the horizontal impact force upon the collision, the horizontal impact force being in a lateral direction toward the vehicle and transverse to a longitudinal axis of the vehicle; and
distributing the horizontal impact force from the collision with the bumper bar, wherein a first fraction of the horizontal impact force is distributed to the fuel container through the one or more straps, and a second fraction of the horizontal impact force is distributed to the bracket.
2. The method of claim 1 wherein the bumper bar protrudes laterally further than the fuel container.
3. The method of claim 1 wherein the first fraction of the horizontal impact force distributed to the fuel container is greater than 10% of the horizontal impact force from the collision.
4. The method of claim 1 wherein the first fraction of the horizontal impact force distributed to the fuel container and the second fraction of the horizontal impact force distributed to the bracket have primary directions that differ by greater than 10 degrees.
5. The method of claim 1 wherein the fuel container is configured to house compressed natural gas (CNG).
6. The method of claim 1 wherein the bumper bar has a hollow interior.
7. The method of claim 1 wherein the bumper bar is formed from one or more pieces of sheet metal.
8. The method of claim 1 wherein the bumper bar comprises a rear surface configured to contact (1) the bracket and (2) the one or more straps configured to secure the fuel container.
9. The method of claim 1 wherein the bumper bar comprises a cross section with at least two non-parallel opposing sides.
10. The method of claim 1 wherein the first fraction of the horizontal impact force distributed to the fuel container primarily has a lateral and an upward component, while the second fraction of the horizontal impact force distributed to the bracket primarily has a lateral component.
11. A tank support assembly comprising:
a bracket configured to attach to a vehicle and hold a fuel container for the vehicle during a collision between the vehicle and an object, a portion of the bracket being positioned at a front or rear of the fuel container;
one or more straps configured to secure the fuel container to the bracket; and
a bumper bar connected to the bracket such that the bumper bar is disposed along a longitudinal axis of the fuel container, wherein the bumper bar is configured to transmit a horizontal impact force from the collision,
wherein the horizontal impact force is in a lateral direction toward the vehicle and transverse to a longitudinal axis of the vehicle, and
wherein a first fraction of the horizontal impact force is distributed to the fuel container through the one or more straps and a second fraction of the horizontal impact force is distributed to the bracket.
12. The assembly of claim 11 wherein the bumper bar protrudes laterally further than the fuel container.
13. The assembly of claim 11 wherein the first fraction of the horizontal impact force distributed to the fuel container is greater than 10% of the force.
14. The assembly of claim 11 wherein the first fraction of the horizontal impact force distributed to the fuel container and the second fraction of the horizontal impact force distributed to the bracket have primary directions that differ by greater than 10 degrees.
15. The assembly of claim 11 wherein the bumper bar is configured to distribute the horizontal impact force so that the fuel container is not damaged when the horizontal impact force is greater than or equal to 50,000 lb.
16. The assembly of claim 11 wherein the bumper bar is configured to contact the fuel container so that the contact area is at least 5% of the total surface area of the fuel container.
17. The assembly of claim 11 further comprising a cover that overlays the bracket and the bumper bar.
18. The assembly of claim 11 further comprising one or more steps supported by the cover.
19. The assembly of claim 11 wherein the bumper bar has a hollow interior.
20. The assembly of claim 11 wherein the bumper bar comprises a cross section with at least two non-parallel opposing sides.