Modulation mechanism of vibration response of RV reducer considering the influence of meshing force and transmission path

The complexity of RV reducer transmission structure leads to complicated amplitude modulation in the vibration response during operations. A thorough understanding of the modulation mechanism in its vibration response is crucial for the design improvement and health monitoring. This paper first uses the Fourier series expansion based method to explore the modulation effect in the vibration response and the frequency composition in the resultant from the perspective of individual meshing force. Subsequently, the transmission path of the vibration signal between the meshing elements and the sensor is analyzed and kinematic model is then established. Analysis and simulation results indicate that the planetary gear meshing element meshing response is modulated by the carrier rotation frequency, while the cycloid-pin gear meshing response is modulated by the crankshaft rotation frequency. As the vibration signal from the meshing element transmitted through a time-varying path, the vibration signal is further modulated to form a complicated composite modulation. Finally, an RV reducer test bench is utilized to demonstrate the proposed model. The developed model provides a useful tool for understanding the vibration modulation mechanism of RV reducer and lays the foundation for subsequent development of fault diagnosis technology.