Structure Design And Accuracy Test Of The Large Ratio Friction Transmission Apparatus

In this paper, the drive theory of the large ratio friction transmission is studied; A new type elliptical cam wave generator is designed; The large ratio friction transmission prototype is designed and manufactured; Based on the ANSYS finite element method software, structure of the elliptical cam is analyzed; Precision index of the manufactured large ratio friction transmission prototype, such as transmission accuracy, least step, stability of the least step, load capacity is measured by the absolute rotary encoder. By analyzing the measurement data and research content, it is think that the new elliptical cam wave generator could overcome a good many problems brought by processing errors, facilitate size precision adjustments, input moment can be achieved in the form of a pure force couple importing; Through this study, "the large ratio friction transmission prototype" could apply in practical engineering basically.Firstly, the Hertz contact theory is used to design the export moment of the prototype; Deformation status of the flexspine under the elliptical cam wave generator action is analyzed using the column shell theory, whose boundary condition is four force action. Design proposal of the wave producer put forward considering the precision theory of rolling friction transmission.Secondly, consider the request that import moment of the prototype must be the form of a pure force couple importing, draw lessons from the advantage of flexible-hinge, a new type elliptical cam is designed and manufactured, which could be adjust by the pre-tightening screw, by using this structure, it is convenient to adjust the size of elliptical cam to design requirements.Based on the ANSYS finite element method software, structure of the new type elliptical cam is researched, effect of the flexible-hinged structure's cross-sectional thickness and the magnitude of pre-tightening force to the performance of elliptical cam is analyzed, using the analysis result, flexible-hinge structure of the elliptical cam is designed in reason.Precision test platform of the prototype is designed, by using the high-precision absolute rotary encoder, precision of the prototype is measured, data processing result show that: under the condition that step angle of the input...