Exploring Manufacturing and Assembly Misalignment Errors on the Mechanical Behavior of a Planetary Gearbox

Planetary gearboxes play a central role in many critical rotating machinery systems, where their manufacturing and assembly accuracy greatly influence their reliability and remaining useful life. Among common faults, gear misalignment stands out as a critical issue predominantly caused by manufacturing inaccuracies and assembly errors. Such misalignments increase operational stresses and accelerate failure mechanisms, adversely affecting gearbox lifespan. This study investigates the effects of various types of gear misalignments- including axial, parallel, and angular deviations on the mechanical behavior and strength of planetary gearbox gears. Using the well-established KISSsoft software, a parametric analysis is conducted to assess how individual and combined misalignment types influence key performance metrics such as root stress, Hertzian contact stress, contact temperature, and transmission error. Results indicate that even small misalignment deviations considerably amplify fatigue damage, surface wear, noise, vibration, and thermal loads within the gearbox. These effects induce system instability, accelerating premature failure modes. The study further reveals the complex interactions between different misalignment types, demonstrating that combined deviations can have multiplicative negative effects compared to single-type misalignments. The findings emphasize the necessity of stringent manufacturing tolerances and precise assembly procedures to minimize misalignments in planetary gearboxes. Furthermore, the research highlights the critical importance of continuous condition monitoring and alignment verification techniques to detect and mitigate misalignment-related faults early in the operational cycle. Optimized gearbox designs capable of accommodating or compensating for certain misalignments can enhance robustness and operational safety, particularly in demanding industries such as aerospace, automotive, and wind power generation.

کلیدواژه ها:

Misalignment ، Planetary Gearbox ، Hertzian Stress ، Transmission Error