Analysis on the Transient Impact and Wedging Performance of the Sprag Clutch in the Turbine Starter
Extending the steady wedging to transient impact is an important component of top-down design for sprag clutch.Based on the theory of mechanical dynamics,the impact differential equation of the sprag clutch is established by correlating the load and response characteristics of the input and output parts,and the dynamic principle and general law are revealed that contained in the process of the clutch running from transient wedging to stable transmission.On this basis,the comprehensive stress analysis model of the transmission shafts is deduced.Moreover,the inspection method of the overall performance using the contact stress,comprehensive stress and gripping angle,etc is proposed.Finally,taking a common sprag clutch component as an example,the short-term load conditions in the turbo starter environment are studied from both theoretical calculation and simulation analysis,which verifies the principle and analysis model proposed in this paper,so they are of great significant for this kind of clutch in design and verification analysis.
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