Ravigneaux Gear Train(spur_gears)

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Ravigneaux geat set is a double planetary gear set. This planetary gear set is commonly used in automatic transmission.Its has two sun gear(large sun and small sun gear) a planet carrier(not present in current model) holding two sets of planetary gears,inner planets and outer planets.The two sets of planet gears rotate independently of the carrier but co-rotate with a fixed gear ratio(in this case 1:1) with respect to each other.The inner planets couple with small sun gear and co-rotate at a fixed gear ratio(1.5:1) with respect to it.The outer planet couple with large sun gear and co-rotate with fixed gear ratio(3.5:1) with respect to it.Finally,the ring gear also couples and co-rotates with the outer planets in a fixed gear ratio(5.5:1) with respect to them.The values of gear ratio were calculated on the basis of pcd of all gears .