Planet Load-Sharing and Phasing

Abstract

This paper presents an analysis of the scientific literature devoted to the problem of load sharing and phasing in planetary gearboxes. The wide range of research topics demonstrates the technical challenges of understanding planetary load-sharing and planet phasing. This review includes studies having the goal of developing models for load sharing and exploring the positive or negative effects of different parameters such as phasing on the load distribution among planets. Practical aspects are also considered, for example, the effects of some errors that are unavoidable during manufacturing or working conditions, e.g., misalignments or position errors. Methods for improving the load-sharing characteristics, e.g., flexible ring or floating components, are discussed as well.

Design, Simulation and Multi-Objective Optimization of a Micro-Scale Gearbox for a Novel Rotary Peristaltic Pump

“…The helix angle incorporated in the gears of the planetary system contribute to an overall reduced PPTE, which is particularly significant in medical equipment applications [72]. In the case of planetary gearsets, studies have shown that a larger number of planets improve the load sharing conditions since the operation load is distributed to multiple planets [73,74]. However, this conclusion can be supported only by theoretical models since, in reality, a larger number of planets would increase the sensitivity to errors [74].…”

“…In the case of planetary gearsets, studies have shown that a larger number of planets improve the load sharing conditions since the operation load is distributed to multiple planets [73,74]. However, this conclusion can be supported only by theoretical models since, in reality, a larger number of planets would increase the sensitivity to errors [74]. In this particular model, since the planets are inseparably attached to the rollers that control the fluid's flow rate, the use of two planets is mandated.…”