Suspension for transport vehicle

The device (1) has a cover (31) intended to be fixed rigidly interdependent from a frame of a vehicle. A support (41) is rigidly interdependent of an axle (2). Rods (51, 61) connect the cover to the support, where each rod is articulated at its ends with the cover and with the support via connections kneecaps. A lateral support unit (7) supports the axle, and comprises a transverse rod (70). The transverse rod connects the cover to the axle leveled with the support, and is placed in inter-space formed between deformable parallelograms formed by rotary joints (3). An independent claim is also included for a method for adjusting a suspension device.