Abstract
Due to a large number of components, complex meshing relations and high requirements for assembly accuracy, the dynamic characteristic of compound planetary gear, such as vibration, impact, periodic motion and load sharing, are more easily affected by internal excitation than those of simple planetary gear set and parallel shafting gear set. To improve the load sharing behavior and the resistance of Chaos motions in the compound planetary gear set, in this work, by introducing the floating support into the center gear and planet gear, a lumped-parameter dynamic model of the compound planetary gear set is built based on the lumped parameter method and Lagrange kinematics equation. The steady response is calculated by numeric method to investigate the influence of floating support from different components on loading sharing behavior and periodic motion. The results indicate that, the increase of the floating value of all components improves the instantaneous load-sharing behavior, and single floating of planet gear reduces the load sharing behavior. To avoid the system being in quasi-periodic motion and Chaos motions under the condition of floating support, the input speed should be avoided away from the range of 3201 r/min-5069 r/min.
Highlights
Due to the characteristics of its structure, the compound planetary gear has a large number of supporting shafting, and a single supporting shaft often bears the supporting load from multiple gears
The analysis above shows that, single floating of planet gear reduce the load sharing behavior of compound planetary gear set, and single floating of different central components has similar effects on load-sharing
To improve the load sharing behavior efficiently, each planet gears should be applied on floating value
Summary
Due to the characteristics of its structure, the compound planetary gear has a large number of supporting shafting, and a single supporting shaft often bears the supporting load from multiple gears. Shock or impinges occurs on the supporting load, due to transmission error or clearance from mating gears and bearings, dynamic load [1] of supporting load will be transferred to the shafting through the contact of the axle and hole, causing the vibration of the shafting and even further decreasing the dynamic characteristics of the gear train. To resist the influence of transmission error and meshing impact caused by backlash on shafting components, floating support is generally used in the center construction of epicyclic gear train, such as carriers, sun gears and rings, to buffer the contact collision caused by axle-hole clearance. A “translation-torsion” lumped parameter dynamic model of the compound planetary gear set is established, to reveal the influence of floating support on vibration impact, periodic motion and load sharing behavior of the compound planetary gear under the condition of transmission error, backlash and time-varying meshing stiffness
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