Curtate ratio is important parameters of cycloid ball planetary transmission

its selection directly affects the transmission performance.According to its importance

the selection of curtate ratio is researched.Firstly

considering the comprehensive mechanical properties of the cycloid ball planetary transmission

and setting the range of curtate ratio.Secondly

based on the stress analysis of the meshing pairs

and the stress analysis and geometric constraints of turning arm bearing

with the reliability of turning arm bearing for the principle the method of compute the lower limit of curtate ratio is determined.Then considering the actual conditions of load fluctuation and top cutting running-in of the meshing pair

and taking the strength of meshing pairs of cycloid ball as the foundation

the method to compute the upper limit of curtate ratio is determined.Finally

the range of curtate ratio is given

and the conclusion is verified by the design examples.