Technician A says when the planet carrier is the driving member of the gear set and the sun gear is held, overdrive occurs. Technician B says if any two of the planetary gear set members receive torque in the same direction at the same speed, the third member is forced to turn with the other two and direct drive is the result. 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. Overdrive occurs when the planet carrier is the driving member and the sun gear is held.

Technician B is also correct. If any two members of the planetary gear set receive torque in the same direction at the same speed, the third member is forced to turn with the other two and direct drive is the result. This is known as the principle of operation of planetary gear sets.

Technician a Says When the Planet Carrier Is the Driving