Abstract
Recently, research regarding non-pneumatic tires that are resistant to punctures has been actively conducted, and the spoke structure design of non-pneumatic tires has been found to be a crucial factor. This study aimed to analyze the vertical stiffness characteristics of a non-pneumatic tire based on the shape of the spoke under the application of a vertical load. The three-dimensional model of a commercial non-pneumatic tire was obtained from the manufacturer (Kumho Tire Co., Inc., Gwangju, Korea), and the vertical stiffness characteristics of the three tire models with modified spoke shapes were compared and analyzed based on a reference tire model. Results show that the vertical stiffness of the fillet applied model is most appropriate. Furthermore, the vertical stiffness characteristics of the analyzed tire models indicate that if fillets with a minimum size are applied to the spokes, the stability of the non-pneumatic tire is expected to improve.
Highlights
In the this reference study, themodel verticalobtained stiffness from characteristics depending on and shape change in shape vertical stiffness characteristics based on the change in the spoke shape were analyzed
Tree branch structure was adopted for the non-pneumatic tire spoke, and a fillet-applied model, asymmetric-spoke division model, and symmetricFigure of vertical stiffness results and total deformation of four mod spoke division model were used for12
The tree branch structure was a with the reference model obtained from Kumho Tire Co., Inc., and the vertical stiffness characteristics based on the change in the spoke shape were analyzed
Summary
Because self-driving electric vehicles must be autonomously driven, the limitations of pneumatic tires, which are susceptible to punctures, must be overcome. Nextgeneration tires, such as run-flat, sealant, and non-pneumatic tires as shown, are being developed. Research on non-pneumatic tires, which are resistant to punctures, has been actively conducted recently. Non-pneumatic tires are composed of a shear beam, hub, spoke, and tread. The shear beam functions similar to the belt in pneumatic tires. The spoke acts in a similar manner as air pressure to support vehicle load, and the tread is grounded with a thick rubber layer. Many studies regarding the structural design of spokes have been conducted
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