Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : February 28, 2017 - March 03, 2017
Powder metal (PM) gears are becoming a more prospective solution for high performance gears, not only because of part price but also because the technology offers a wider design window. Since powder metal alloys have a lower Modulus of Elasticity and Poisson Ratio — the factors that amplify gear tooth deflections — the design window opens up further.
The contact ratio is a critical gear mesh parameter that greatly affects gear drive performance, including load capacity, noise, and vibration. Gear drive operating load produces bending and contact tooth deflections, which increase the actual effective contact ratio.
The article describes the analysis and gear macrogeometry optimization of powder metal gears with transitional nominal contact ratios εα = 1.7-1.85. Under the operating load, the effective contact ratio of these gears is increased to εαe ≥ 2.0 creating greater load sharing, as well as providing stress and transmission error reduction.
