Multispoke airless composite tire: strength and stiffness

Model of multispoke airless tires, possessing strength and stiffness comparable to classical pneumatic tires is presented in this paper. The wheel structure with inclined spokes was used as the initial design, it has high reliability and flexibility through the ability to change of the form and angle of inclination of the spokes. Confirmation of the structure of airless tires was carried out by initial analytical research. The initial design of the wheel and the load are selected based on the analogue - pneumatic tire 7,50-20. Stiffness and strength of flexible spokes have been identified according to their geometry and physical-mechanical properties of the structural material by the mechanics of materials' method. The efficiency of obtained design was verified by analyzing the stress-strain state of the finite element method (FEM), with two main modes of vehicle loading: maximum traction and maximum static load. Parameters of spoke wheels have been clarified by using the FEM, taking into account the nonuniformity of loading of the spokes, and nonlinear characteristic of normal stiffness airless wheel was obtained (similar to pneumatic wheel), considering the possibility of contact between the spokes is above a certain load level. Thus, obtained the required contact spot between the wheel and the road surface, and provided high stiffness under increased loads. The results of this work allow considering the proposed design multispoke airless tire enough a functioning, possessing increased reliability and the possibility of use for civilian and military vehicles.