Abstract: In order to reduce the vibration of rigid pin-cycloid speed reducer and improve its operational reliability, a non-rigid pin-cycloid speed reducer with damping mat is designed its nonlinear vibration characteristics are analyzed. Taking into consideration of three internal excitations, including time-varying stiffness, axial error and meshing impact, an eight-degrees of freedom multi-factor coupling dynamic model of the designed pin-cycloid speed reducer is established based on the theory of concentrated parameter, and the vibration differential equations are set up based on Newton second law. Then, the equations are solved by adopting the fourth-order Runge-Kutta algorithm with variable step length. The verticality and the torsion vibration characteristics of the cycloid gear and low speed shaft of the new pin-cycloid speed reducer are compared with that of traditional one. Results show that the verticality and the torsion vibration of the cycloid gear and low speed shaft are reduced by the damping mat. Also the theoretical analysis is verified by measurement data from the test of the new reducer.

Key words: mechanical design, new pin-cycloid speed reducer, damping mat, non-linear vibration characteristic, dynamic design