In the previous study, we have developed two non-involute spur gears that have involute-cycloid composite tooth profile and modified cycloid tooth profile, and proved that these gears have greater bending strength and surface durability than the involute spur gear. In this study, we measured the friction losses of involute-cycloid composite tooth profile gear, modified cycloid tooth profile gear and involute gear using a power circulating-type gear testing machine, by the oil immersion formula, whose method is based on the oil temperature rise due to the power loss in the gear drives. It was found that the involute-cycloid composite tooth profile gear has the least friction loss in the three gears. Furthermore, we calculated the gear friction losses of these gears. The calculated value agreed with the experimental data.

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