Research On Drive Accuracy And Inherent Characteristic Of RV Reducer

Equipment manufacturing is an important component of modern industryinvolved in aerospace, defense, precision machining and other fields. High precisionreducer has a great significance ensuring the accuracy and reliability of productprocessing as an important basic part in mechanical drive of equipment manufacturing.Researching the drive performance of RV reducer can effectively enhance theworking conditions of machine, improve working accuracy, running stability andother common problems in manufacturing process.RV reducer is a new type of two-stage reducer developed from the traditionalcycloid drive mechanism, combining series of advantages both cycloid-gear drive andinvolute-gear drive, also includes high transmission efficiency, smooth operation, highaccuracy and structure compact, suitable for all types of work situations. In order toimprove the processing economy and expand industrial applications of RV reducer,research in drive accuracy and vibration of shaft parts has been performed in thispaper. The research work completes the following tasks:The structure and basic principle of RV reducer is studied and the system’stransmission ratio is deduced by using transformation institution method. Theformation of outer cycloid tooth profile curve method and the continuous transmissioncondition of cycloid institutions is also been studied. The epicycloidal theoreticalcontour line and the actual contour line equation is deduced, using3D softwarePro/Engineer build the cycloid model.From the formation reasons of mechanism error, summed up the RV systemrelated to the characteristics of the transmission accuracy, using the method ofequivalent model established parts manufacturing error and the equivalent error modelof micro displacement. According to the principle of individual influence of error, todetermine the single rule’s effect on gear reducer’s output accuracy, and build theanalysis function. Analysis shows that it is necessary to study the torsion stiffness ofthe output mechanism.Based on stress function method, simplifying the RV reducer output mechanismto elastic cylinder, and analysis the reverse problem, established its generalcalculation process; Using Workbench to simulate the torsion deformation of planet carrier of reducer output mechanism, from the deformation and needle tooth shellcalculated their torsion stiffness; When the output mechanism stiffness taking extremevalue, the impact resistance of reducer is studied.Motion differential equation of shafts torsion vibration in RV reducer is deduced,the boundary conditions of the shaft under different circumstances were listed; Takecrank shaft and gear shaft for example, investigated the effects on the intrinsiccharacteristics of not forced and forced s situation, and compared the data with theintrinsic characteristics of the whole machine, analysis the dangerous frequency;summarizes the cause of gear reducer resonance related key points, improvementmeasures are proposed from a design perspective.The inherent characteristics of reducer shaft parts have been calculated andstudied, which based on the two aspects of discrete theory and finite element modalsimulation. Under the free state and forced state, the low intrinsic properties of crankshaft and the input shaft have been calculated through the torsion vibration equationsestablished by discrete theory, obtained its dangerous frequency. The low order modesof shafting have been simulated and verified by the Workbench. In this paper, theimprovement measures have been proposed according to trigger system resonancefactors, to comparison and analysis, the structure of the crank shaft and input shafthave been optimized so that its inherent characteristics is changed, which caneffectively reduce the torsion vibration of shaft system and achieve the purpose ofimproving dynamic performance of the transmission system.