Since March 26, 2019, comparative tests of EC and involute gearing have been carried out at STC KAMAZ.
The test facility visited the gene. Director of KAMAZ PJSC - Sergey Kogogin.

Two-stage helical gearboxes 5Ц2-125-12,5 with EC and involute gears participate in comparative tests.
1. Involute gearing is processed by grinding (accuracy class 5-6). Z1 = 15/62, Z2 = 20/60. EC-gearing is processed by the method of blade processing (line-processing with a spherical carbide end milling cutter, 6-7 accuracy class). Z1 = 11/41, Z2 = 12/40.
2. Gear ratio: 12.5.
3. Input turns: 0-500-1000-1500 rpm.
4. Power: 30 kW.

The results of comparative tests of EC and evolvent gears:
1. The oil temperature in the gearbox with EC-gearing is 5 degrees lower.
2. The efficiency in the EC-reducer is ~ 2% more.
3. Noise and vibration are approximately equal.

It was decided to continue testing for up to 80 hours using the methodology of STC KAMAZ. With an increase in the accuracy class of grinding of EC-teeth (5-6 class of accuracy) in EC-gearing, noise and vibration will be lower.

Comparison of involute gearing geometry and EC-gearing of a two-stage gearbox.

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