Download Chapter 5 Answers to Review Questions

Chapter 5 Answers to Review Questions
CLASSROOM MANUAL, PAGES 144-146
Short Answer Essays
1. Current model number coding indicates the work capacity of the transmission, the number of forward gears, its directional
placement in the vehicle, and whether it has electronic controls.
2. Transmission housings are cast to secure and accommodate: multiple friction disc assemblies, fluid passages, threaded
bores and/or studs to fasten mounts, bores for the fluid level dipstick and filler tube, various threaded bores for a variety of
sensors and switches, bores for gear selector attachment, fittings for the fluid cooling lines, mounting points for the pump and
valve body, mounting for the oil pan, and round structures projecting from the side to serve as the cylinders for the servo and
accumulator assemblies. Some housings have bores for the band adjusting screws.
3. There are two common designs of compound gearsets: the Simpson gearset, in which two planetary gearsets share a
common sun gear, and the Ravigneaux gearset, which has two sun gears, two sets of planet gears, and a common ring gear.
4. The input shaft connects the output of the torque converter to the driving members inside the transmission. Each end of the
input shaft is externally splined to fit into the internal splines of the torque converter’s turbine and the driving member in the
transmission. Normally, the front clutch pack’s hub is the driving member. The output shaft connects the driven members of
the gearsets to the final drive gearset. The rotational torque and speed of this shaft varies with input speed and the operating
gear. On RWD vehicles, the output shaft is connected to the rear drive axle by the drive shaft.
5. A band is a braking assembly positioned around a stationary or rotating drum. The band brings a drum to a stop by wrapping
itself around the drum and holding it. Connected to the drum is a member of the planetary gear train. The purpose of a band
is to hold a member of the planetary gearset by holding the drum and connecting planetary gear member stationary.
6. Torrington bearings are thrust washers fitted with roller bearings. These thrust bearings are primarily used to limit end play
but also to reduce the friction between two rotating parts. Most often Torrington bearings are used in combination with flat
thrust washers to control end play of a shaft or the gap between a gear and its drum.
7. Chain-drive final drive assemblies use a multiple-link chain to connect a drive sprocket, connected to the transmission's
output shaft, to a driven sprocket that is connected to the differential case. This design allows for remote positioning of the
differential within the transaxle housing.
8. External and internal snap rings are used as retaining devices throughout the transmission. Internal snap rings are used to
hold servo assemblies and clutch assemblies together and are available in several thicknesses so they can be used to adjust
the clearance in multiple-disc assemblies. Some snap rings for clutch packs are waved to smooth clutch application. External
snap rings are used to hold gear and clutch assemblies to their shafts.
9. The band is hydraulically applied by a servo assembly. The servo assembly converts hydraulic pressure to a mechanical
force that applies a band to hold a drum stationary.
10. When two gearsets are in tandem, the front ring gear is normally connected to the rear carrier and the rear ring gear is
connected to the front carrier.
Fill-in-the-Blanks
1. Separate casting, transmission housing
2. Bushings
3. Sprag, roller
4. Helical, planetary, hypoid, chain drive
5. Sun gear, planetary carrier, ring gear
6. Increased, decreased
7. O-ring, lip seal, square-cut seal
8. Butt-end, open-end, hook-end
9. Rubber, cork, paper, synthetic materials, plastic
10. Sun, planet, ring
Multiple Choice
1. A
2. C
3. D
4. C
5. C
6. A
7. B
8. C
9. C
10. C