Technician A says a Simpson geartrain is an arrangement of two separate planetary gearsets with a common sun gear, two ring gears, and two planetary pinion carriers. Technician B says a Ravigneaux gearset has two sun gears, two sets of planet gears within a single carrier, and two ring gears. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because a Simpson geartrain indeed consists of two separate planetary gearsets with a common sun gear, two ring gears, and two planetary pinion carriers. Technician B's description inaccurately describes a Ravigneaux gearset, which actually has two sun gears, a set of long and short planet gears within a single carrier, and one ring gear, not two.

Technician a Says a Simpson Geartrain Is an Arrangement of Two