Tubular suspension spring

Tubular suspension spring, structured in an elongated body (1) which has an internal cavity (11) of variable cross-section in its different longitudinal zones, the walls of this internal cavity (11) being able to maintain constant or variable thicknesses along its longitudinal axis. This elongated body (1) defines conformations (12) for mounting complementary elements and/or anchoring solutions to be fixed to the axle or chassis of vehicles, and is presented as a single piece. The internal cavity (11) of the elongated body (1) can have a configuration open by at least one of its ends or closed by one or two ends. Furthermore, in at least one of the ends of the elongated body (1), a bearing head (2) can be formed or shaped.