Analysis of Loss Factor of Small Sized Gear Reducer for Electric Motor (Experimental Presumption by Grease Lubrication of NLGI Consistency Number 2)

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In this paper, we analyzed the mechanical loss factor of a geared motor, which is composed of a 90W induction motor and a parallel gear reducer with total reduction ratio 9 and 18. Gear mesh was lubricated with the grease of NLGI consistency number 2. The loss factor was evaluated as the sum of load independent part, or at no loading, and load dependent part. The loss of oil seal and grease was examined by the measurement of the geared motor at no loading. The friction loss of bearing was evaluated in terms of the coefficient of friction of bearing, which was measured by the unit testing of bearings. Change by a temperature of the loss of grease was measured by the experiment. And the friction loss of tooth flank was decided as the residual value after subtracting other losses obtained value from the experiments. The result shows that the loss at no loading holds the higher proportion of loss, due to the oil seal and the grease. When load was applied, the portion of the loss of tooth flank increased. The mean friction coefficient of a tooth flank by grease lubrication proved to be a representative value of 0.12, which was verified the gear reducer of the difference dimension.