Abstract
Interference fit is widely used in the high-speed coupling of the micro gas turbine, so its load capacities concerning the maximum torque and the limit angular velocity must be analyzed accurately. In this paper, a model of the interference fit of the high-speed coupling is established to calculate the normal stresses and shear stress of the contact area of the high-speed coupling by using elastic theory. Then the solution of the maximum torque and the limit angular velocity of the contact area of the coupling are derived. Finally, taking a 100-kW micro gas turbine as an example, the load capacities are studied and the numerical results show that the static friction coefficient of the inner surface and the structural characteristics are important influence factors for determining the load capacity of the high-speed coupling.
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