Axial Force and Efficiency Tests of Fixed Center Variable Speed Belt Drive 810103

Report describes experiments which investigated interactions of the axial “sheave spreading” forces with centerline force and torque in a fixed center compound variable speed rubber belt drive at different speed ratios, speeds, and loads. An experimental rig, geometrically similar to a belt drive CVT, was designed and built, and operated at selected speed ratios, power levels, and total tension. The data provide a preliminary determination of variable speed belt CVT axial force control requirements and indicate high transmission efficiencies over a wide range of conditions when the axial forces are moderated to keep the traction coefficient within a certain range.


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