STIFFNESS IMPROVEMENT OF A TOPOLOGICALLY OPTIMISED GEAR MANUFACTURED BY SLM
At Egile AeroTransmissions division, we are specialists in the aeronautical sector, designing and manufacturing power transmission reducers for turbines, turboprops and turbofans and main transmission components for helicopters.
We provide conceptual solutions under customer’s own specifications, with whom we work very closely during all phases, from design to the development of complete systems.
We are allied with the main agents from our sector such as SAFRAN Group, ROLLS-ROYCE and AIRBUS HELICOPTERS.
GEAR TRANSMISSION SYSTEMS
Vibration and noise of gear sets are directly related to the whole characteristics of transmission systems. The loose of stiness is one of the most detrimental characteristics of these systems, that worsen flank-centred contact between teeth. This would, in fact, deteriorate performance and increase the noise of gear transmission systems. So maximization of stiness is always a key factor on the design of gear transmission systems.
In this regards, additive manufacturing technology allows re-design of components, placing material only where it is needed according to stress distribution, allowing improvement of stiness.
Illustration of contact distribution on the flank due to the contact between teeth.
STIFFNESS INCREASE AFTER TOPOLOGY OPTIMISATION PROCESS
Topology optimisation enables the increase of gear sti ness without compromising gear weight. A new conception of gear with organic shape in the areas non-subjected to geometrical constrictions was designed.
Stress distribution of the topologically optimised geometry
After topology optimisation a better performance of the gear was obtained by reducing 3 important factors: Weight (-400 g), maximum displacement (-25 %) and maximum Von Misses stress (-8%).
Following table shows these results.