chapter 4 answers to review questions

8/3/2019 Chapter 4 Answers to Review Questions

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Chapter 4 Manual Transmissions/Transaxles

Answers to Review Questions

Classroom Manual, Pages 9597

Short Answer Essays

1. The purpose of a transmission is to use different gearratios to provide the engine with a mechanical advantage over thevehicles drive wheels.

2. The primary purpose of a synchronizer is to equalize thespeed of a shaft and gears before they are engaged in order toeliminate gear clashing and allow for smooth changing of gears. It also

serves to lock these parts together.

3. The three stages of synchronization are: (1) The sleeve ismoved toward the gear by the shifter lever. The movement of thesleeve causes the inserts to press the blocking ring into the cone ofthe gear. (2) The synchronizer sleeve slips over the teeth of the gearcone. This brings the gear to the same speed as the synchronizerassembly. (3) The sleeve slides over the gear teeth, locking the gearand its synchronizer assembly to the main shaft.

4. The front bearing retainer serves several functions: ithouses on oil seal that prevents oil from leaking out the input shaft; it

holds the front bearing rigid in the transmission case; and it serves asthe sleeve for the throw-out bearing to ride on.

5. Reverse is obtained by the addition of an extra gear in thegeartrain, called the reverse idler gear, which causes the reverse gearto rotate in a direction opposite the direction of the forward gears.

6. The transmission and transaxle are practically identical inoperation; both provide torque multiplication and allow forsynchronized shifting. Transaxles, however, contain the differentialgears and are connected directly to the drive axles.

7. The major difference between the differential of a rear-wheel drive (RWD) vehicle and a front-wheel drive (FWD) vehicle is theway power flows. In RWD, power flow changes direction 90 degreesbetween the ring gear and the pinion. This change in direction is notneeded with FWD because the transverse engine location places thecrankshaft so that it is rotating in the correct direction.


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8. The moving metal parts must not be allowed to touch andare separated by a thin film of lubricant. This film prevents friction andwear. Bearings also rely on lubricant to allow for smooth and lowfrictional rotation of gears and shafts.

9. When first gear is selected, the first and second gearsynchronizer engages with first gear. This connects first gear with theoutput shaft. Since first gear and the input shaft are in constant mesh,power flows from the input shaft to the output shaft. This causes theoutput shaft to drive the differential ring gear.

10. Fifth gear in transmissions and transaxles reduces enginerpm at highway speeds, and therefore decreases fuel consumptionand engine noise.

Fill-in-the-Blanks

1. Gears, power, drive wheels

2. Transmission, differential, drive axles

3. Hub, sleeve, blocker ring, inserts

4. Input gear

5. Shift forks

6. Main shaft

7. Sliding gear, collar shift, synchromesh

8. Constant mesh, collar shifted

9. Motor, automatic transmission

10. Gears, shaft

Multiple Choice

1. C

2. A

3. B

4. C

5. C


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6. B

7. C

8. A

9. A

10. C

Shop Manual, Pages 161162

ASE-Style Review Questions

1. C

2. D

3. D

4. C

5. B

6. A

7. A

8. C

9. D

10. A

ASE Challenge

1. A

2. B

3. D

4. D

5. A

chapter 4 answers to review questions

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