Compression type multistep energy absorption device

The invention discloses a compression type multistep energy absorption device, and belongs to the technical field of passive safety of mass transit vehicles. The device can effectively achieve the aim that in the collision process of the vehicles, impact energy can be absorbed. An energy absorption cylinder is a two-step hollow cylinder, and annular wedge-shaped grooves are formed in the end faces of two steps of the hollow cylinder; a first cylinder ring body is arranged at the first step position, and a second cylinder ring body is arranged at the second step position; a first annular wedge-shaped piece matched with the annular wedge-shaped groove is arranged on the front end face of the first cylinder ring body, and a second annular wedge-shaped piece matched with the annular wedge-shaped groove is arranged on the front end face of the second cylinder ring body. A first mounting base and a second mounting base are each provided with a central hole, and the central holes are matched with the two steps of the energy absorption cylinder respectively in diameter; and a first guide cylinder is fixedly connected to the front end face of the first mounting base, and a second guide cylinder is arranged between the rear end face of the first mounting base and the front end face of the second mounting base. The compression type multistep energy absorption device is mainly used for passive safety of the mass transit vehicles