An elastic suspension device for a motor-hanger of an axleless bogie system, - wherein at least one elastic material component is configured to be arranged in the suspension system of the axleless bogie system; - wherein the elastic material component is combined with a metallic component to form an elastic-metallic combination component; - exactly three free surfaces are provided for the elastic material component in the elastic-metallic combination component, whereby stress release is realized by the multiple free surfaces of the elastic material component, therefore, the stress of the elastic material component of the axleless bogie in all directions is reduced, wherein providing multiple free surfaces of the elastic material component refers; - wherein the free surfaces for the elastic material component are designed at different angles and positions in the combination of elastic material component and the metallic component respectively according to the stress conditions of each component, so that stress can be released by the free surfaces when the elastic material component is stressed in all directions, and the stress of the elastic material component is reduced, - wherein the free surfaces are provided in three directions respectively, the first free surface, called the outer free surface, being designed in the outer side of diameter direction in which the elastic material is combined to the metal material; the second free surface, called the inner free surface, being designed in the inner side of diameter direction in which the elastic material is combined to the metal material; and the third free surface, called the inclined side free surface, being designed in the inclined direction in which the elastic material is combined to the metal material; these three free surfaces guaranteeing that stress is released when the elastic material component is stressed in multiple directions; - characterized in that the inclined side free surface is connected to the inner free surface to form a spherical elastic material component structure, this structure being combined to the outer free surface, such that the entire elastic material forms a Y-shaped elastic material component, in order to meet the requirements of a very high axial stiffness and low radial stiffness of the elastic component of the system with independent wheels at the same time. - wherein at least one elastic material component is configured to be arranged in the suspension system of the axleless bogie system; - wherein the elastic material component is combined with a metallic component to form an elastic-metallic combination component; - exactly three free surfaces are provided for the elastic material component in the elastic-metallic combination component, whereby stress release is realized by the multiple free surfaces of the elastic material component, therefore, the stress of the elastic material component of the axleless bogie in all directions is reduced, wherein providing multiple free surfaces of the elastic material component refers; - wherein the free surfaces for the elastic material component are designed at different angles and positions in the combination of elastic material component and the metallic component respectively according to the stress conditions of each component, so that stress can be released by the free surfaces when the elastic material component is stressed in all directions, and the stress of the elastic material component is reduced, - wherein the free surfaces are provided in three directions respectively, the first free surface, called the outer free surface, being designed in the outer side of diameter direction in which the elastic material is combined to the metal material; the second free surface, called the inner free surface, being designed in the inner side of diameter direction in which the elastic material is combined to the metal material; and the third free surface, called the inclined side free surface, being designed in the inclined direction in which the elastic material is combined to the metal material; these three free surfaces guaranteeing that stress is released when the elastic material component is stressed in multiple directions; - characterized in that the inclined side free surface is connected to the inner free surface to form a spherical elastic material component structure, this structure being combined to the outer free surface, such that the entire elastic material forms a Y-shaped elastic material component, in order to meet the requirements of a very high axial stiffness and low radial stiffness of the elastic component of the system with independent wheels at the same time.