Device for fastening a tank to a vehicle

1. A device for fastening a tank, having a shape of a cylinder according to an axis, to a vehicle, the axis being arranged horizontally, wherein the device comprises:

at least two identical flat frames, perpendicular to the axis, comprising an opening presenting a shape identical to a cross-section of the tank perpendicular to the axis so as to be able to enclose, at least partially, the tank, a fastening interface to the vehicle and an impact energy dissipation feature to dissipate impact energy transmitted to the tank according to a horizontal direction perpendicular to the axis, arranged between the opening and the fastening interface; and

wherein the impact energy dissipation feature comprises a weakened zone of at least one frame of the at least two identical flat frames, the weakened zone being between the opening and the fastening interface.

2. The device according to claim 1 , wherein the fastening interface is not arranged in a horizontal plane passing through the axis and is arranged above the axis.

3. The device according to claim 1 , wherein the impact energy dissipation feature dissipates energy by deformation and/or breakage.

4. The device according to claim 1 , wherein the weakened zone follows a line separating the opening and the fastening interface.

5. The device according to claim 4 , wherein the line runs from one edge of the at least one frame to the other and is secant to a line joining the fastening interface to the axis.

6. The device according to claim 4 , wherein the line is bisecting an angle formed by a tangent to the opening and a vertical line passing through the fastening interface.

7. The device according to claim 4 , wherein the line is circular centered on the axis.

8. The device according to claim 4 , wherein the weakened zone comprises holes parallel to the axis, arranged along the line.

9. The device according to claim 1 , wherein an opening is incomplete in that the opening does not completely enclose the tank and wherein the device further comprises a strap completing the opening.

10. The device according to claim 1 , further comprising a shield, connecting the at least two identical flat frames.

11. A vehicle comprising a tank of pressurized gas, wherein the tank is fixed to the vehicle by the device according to claim 1 .

12. The device according to claim 10 , wherein the shield is positioned on a side of the tank that is opposite of the fastening interface.

13. The device according to claim 1 , wherein the tank has a vehicle side at the fastening interface and an external side facing opposite the vehicle side, and wherein the at least two identical flat frames substantially surround the tank such that portions of each frame extends at least from the vehicle side and around an outer periphery of the tank to the external side.

14. The device according to claim 13 , wherein each frame includes the weakened zone.

15. The device according to claim 13 , wherein each frame includes at least a first portion extending along the vehicle side of the tank and a second portion extending from the first portion over the outer periphery of the tank to the external side of the tank, and wherein the weakened zone extends along a path from the first portion to the second portion.

16. The device according to claim 15 , wherein the weakened zone comprises a plurality of holes arranged along the path, and wherein at least some holes of the plurality of holes extend along respective axes that are parallel to the axis of the cylinder.