Technician A says that a Simpson gearset is two planetary gearsets that share a common sun gear.
Technician B says that a Ravigneaux gearset has two sun gears, two sets of planet gears, and a common ring gear. Who is correct?
a. Technician A only
b. Technician B only
c. Both A and B
d. Neither A nor B
The Correct Answer and Explanation is :
The correct answer is c. Both A and B.
Explanation:
- Simpson Gearset (Technician A):
- A Simpson gearset is indeed a type of planetary gear system that consists of two planetary gearsets that share a common sun gear. This arrangement is commonly found in automatic transmissions, where the gearset can provide a variety of gear ratios by utilizing different combinations of input, output, and carrier gears. The Simpson gearset typically includes a sun gear, multiple planet gears (on a carrier), and a ring gear. The gearset is often used in automotive transmission designs for creating multiple gear ratios.
- Ravigneaux Gearset (Technician B):
- A Ravigneaux gearset is a type of planetary gearset that indeed has two sun gears, two sets of planet gears, and a common ring gear. This configuration allows for greater flexibility in creating multiple gear ratios in a single planetary system. The two sun gears rotate in different directions or at different speeds, which provides the ability to achieve more complex gear ratios. The Ravigneaux gearset is often used in automatic transmissions to provide smoother and more efficient shifts.
In both cases, the descriptions given by Technicians A and B are accurate:
- Technician A correctly describes the Simpson gearset, which involves two planetary gearsets sharing a sun gear.
- Technician B accurately describes the Ravigneaux gearset, which consists of two sun gears, two sets of planets, and a common ring gear.
Thus, both technicians are correct, and the answer is c. Both A and B.