Exam 8: Gears and Shafts

Output torque and output speed is decreased when a large gear drives a small gear.

The output gear rotates in the same direction as the input gear when an external gear drives another external gear.

Describe what produces overdrive in a planetary gear set.

Describe the purpose of bearings fitted to a shaft or gear.

Neutral gear results when the input into a planetary gear set is holding a member.

Thrust washers are included in a transmission or transaxle overhaul kit.

Technician A says etching is a discoloration or removal of some material caused by corrosion or some other chemical reaction. Technician B says thrust washers should be replaced with new ones if they are pitted or scored. Who is correct?

Technician A says gear reduction is accomplished by holding the sun gear and applying torque to the ring gear. Technician B says gear reduction can also occur if the ring gear is held and the sun gear is the input gear. Who is correct?

The ____________________ holds or drives members of the planetary gear set.

Define the result of a large gear driving a smaller gear.

Overdrive occurs when the sun gear is the driving member of the gear set.

While discussing the transmission housing and/or case, Technician A says when removing parts from inside the case, pay close attention to the location of the check balls that may be in the hydraulic system. Technician B says that the case passages can be checked using high-pressure compressed air to determine leaks and cracks. Who is correct?

When the planetary carrier is held, the gear set produces which of the following conditions?

The planet gears are in constant mesh with the sun and ring gears.

Technician A says gear ratio expresses the size difference of two gears by stating the ratio of the driven gear to the drive gear. Technician B says the mathematical relationship, according to the number of teeth, of one gear to another is expressed in gear ratios. Who is correct?

Describe the result of a small gear driving a large gear.

Explain how reverse gear is obtained in a planetary gear set.

​Technician A says the differential case is located between the side gears. Technician B says the differential case is mounted on bearings so that it is able to rotate independently of the drive axles. Who is correct?

Thrust load is a load placed in parallel with the center of an axis.

Explain the advantages of a Ravigneaux gear train over a Simpson gear train.