国 上海久通大学 Compound Train Design:example Design train with gear ratio of 180:1 Two stages have ratio 180=13.4164 (too large) Three stages has ratio180=5.646 180=5.646 N, At 14 teeth actual ratio is =179.6789 Pinion Teeth *ratio Gear teeth 12 5.646 67.7546 13 5.646 73.4008 14 5.646 79.0470 15 5.646 84.6932 16 5.646 90.3395 图上涤夫廷大学 Example-1 Desired ratio:180=22x32x5 Want to keep each ratio about the same (i.e.6x6x5) wwww viziiMsiN 14t84 >14x6=84 >14x5=70 XZZZZ4ZZZZ ▣Total ratio: a (70/84)2 =180 14八14 ▣Ve could have used: 180=2x90=2x2x45=2x2x5x9=4x5x9 or4.5x6x(20/3)etc. 55  Design train with gear ratio of 180:1  Two stages have ratio （too large）  Three stages has ratio  At 14 teeth actual ratio is 180 13.4164 180 5.646 3  Pinion Teeth * ratio Gear teeth 12 5.646 67.7546 13 5.646 73.4008 14 5.646 79.0470 15 5.646 84.6932 16 5.646 90.3395 179.6789 14 79 3        3 3 2 180 5.646 N N         Compound Train Design：example  Desired ratio: 180=22x32x5  Want to keep each ratio about the same (i.e. 6x6x5)  14x6=84  14x5=70  Total ratio: 180 14 84 14 70 2               We could have used: 180=2x90=2x2x45=2x2x5x9=4x5x9 or 4.5x6x(20/3) etc. Example-1