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Automatic Transmissions and Transaxles, Fourth Edition
By Tom Birch and Chuck Rockwood
2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
OBJECTIVES
After studying Chapter 10, the reader should be able to:
1. Describe some of the transmissions used in
domestic vehicles.
2. Describe some of the transmissions used in the
more popular import vehicles.
3. Explain the operation of a particular transmission.
4. Identify which transmission is used in a particular
vehicle.
5. Identify a particular transmission.
-
Automatic Transmissions and Transaxles, Fourth Edition
By Tom Birch and Chuck Rockwood
2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
INTRODUCTION
In the following sections, we will briefly describe the more common transmission and transaxles.
They will be described by manufacturer and cross-referenced by the gear train types described in
Chapter 5.
A particular transmission design may have many small differences.
In any single year, there may be many versions of the same transmission depending on the
application.
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Automatic Transmissions and Transaxles, Fourth Edition
By Tom Birch and Chuck Rockwood
2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
INTRODUCTION
Transaxles
A transaxle is a combination of a transmission, either
standard or automatic, and a
final drive assembly.
FIGURE 10-1 When a vehicle is driving straight, the
differential gears rotate as a unit; equal load keeps the
pinion gears stationary on the mate shaft (a). An
unequal load causes the pinion gears to rotate on the
mate shaft so one axle can turn faster than the other
(b). (Courtesy of Chrysler Corporation)
-
Automatic Transmissions and Transaxles, Fourth Edition
By Tom Birch and Chuck Rockwood
2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
INTRODUCTION
There are essentially four types of final drive and differential combinations used in transaxles:
The first type uses helical gears and an intermediate/idler gear or shaft to transfer power from the transmission planetary gear
assembly to the differential case
The second type uses a planetary gearset mounted to the output of the transmission gearset for the final drive reduction gears
The third type uses a planetary gear final drive that is driven by a chain and sprockets from the transmission section
Some FWD vehicles use an engine mounted lengthwise in the vehicle so the crankshaft and the transaxle shafts run longitudinal
(fore and aft) instead of transverse or lateral (side to side) relative to
the vehicle.
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