Abstract
The movement behavior of tooth contact pattern is one of major characteristics for hypoid gears. Especially, the VH behavior (i.e. the movement of tooth contact pattern for Vertical and Horizontal displacement) is extremely important not only for mesh quality but also for lapping productivity. This paper visualized the VH behavior of heat-treated hypoid gears by analyzing their ease-off directly using the measured tooth flanks. As a result, it is clarified that the lapping productivity depends upon the VH behavior: (1) bad lapping productivity shows the identical movement directions of tooth contact pattern for the vertical and horizontal displacement. (2) good lapping productivity has a crossed movement directions of tooth contact pattern for vertical and horizontal displacement. (3) Large cutter radius has a good lapping productivity. All analysis results are confirmed by test.
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