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75% additional efficiency with Lauramid low-loss gear wheels

News International-French

2 Mar 2015

JEC Europe 2015 - Together with the Technical University of Munich, the polyamide specialist Handtmann Elteka researched optimized tooth geometries in plastic-steel gear pairings.

Generally, the main benefit of using plastic gear wheels is their dry running ability. The downside: the resulting high friction factors and the lower thermal conductivity of the material as compared to steel. Loss-optimized tooth geometries show significantly lower frictional losses as well as lower warming and can thus transfer a higher performance until the maximum operation temperature is reached. Visually, low-loss toothings show noticeably higher penetration angles and a reduced teeth height as compared to conventional tooth geometries.

The research team applied lubricant-free operating Lauramid-steel gear wheel pairings for their tests. Lauramid is a special cast PA 12. A sufficient load capacity at torque input was enabled by a knurled steel hub. This was unsolvably cast in during the Lauramid production process. Among others, toothing losses and tooth temperatures were measured at the test facilities. Lower toothing losses result in a considerably lower heating of the loss-optimized gears as compared to conventional toothings. The tests also showed that the low-loss geometry allows for a clearly broader operating range as compared to conventional solutions: Low-loss Lauramid-steel gear wheels transferred an up to 75 % higher output and ensured better absorption as compared to standard toothings.

Booth: F48-2