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In recent years we have conducted research of new gears with a progressively curved path of contact as illustrated in Figure 1 below. We also tried to prove features anticipated for these gears. Thus our research focused on durability of this type of gears regarding to pitting and scuffing. We compared them to the involute gears of the same dimensions. We discovered a higher load capacity of tooth flanks of the new gears compared to the involute gears in case of scuffing. Both types of gears showed approximately the same load capacity against pitting if a transverse operating angle was the same in both cases. It has been proved that the new gears had better efficiency and considerable lower wear. We tested gear pairs made of through hardened steel and those nitrided after machining. Our paper will discuss some results of the research work on the new type of gears for which we believe they will find their way to the practice.

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