Aiming at the problem of large structure

severe vibration and high level of noise for the present external parallel moving gear transmission

a kind of internal parallel moving gears transmission with compact structure and complete balance is proposed.The elastic dynamics equation of the system is established by synthetically considering some factors.In the modeling process

the factors including the elastic deformation of all eccentric shafts

the elastic deformation of meshing gears

the elastic deformation of planetary bearing on eccentric shafts and supporting bearing on output shaft

and some dynamic characteristics such as the natural frequency

gear engaging force

bearing loads of system are derived according to the equation

and the results are analyzed.The basis on further optimizing the design of gear transmission

reducing vibration and improving mechanical properties is provided.