Lesson 9: The Drivetrain

25
Free Auto Repair Classes. Lesson 9: The Drive Train Jeff Crawford Crawford’s Auto Repair

description

Jeff Crawford (Crawfords Auto Repair) explains how the drivetrain works and the parts that it is composed of. Descriptions of the transmission, drive shaft, differential, and transaxle are included. The lesson also explains the differences between a front-wheel drive, rear-wheel drive and four-wheel drive vehicles.

Transcript of Lesson 9: The Drivetrain

Page 1: Lesson 9: The Drivetrain

Free Auto Repair Classes.Lesson 9: The Drive Train

Jeff CrawfordCrawford’s Auto Repair

Page 2: Lesson 9: The Drivetrain

The Drive Train

The Drive Train is also called the Power Train

Parts include:◦ Transmission

◦ Drive Shaft (or drive line)

(in 4-wheel or rear-wheel drive vehicle, described later)

◦ Differential

Page 3: Lesson 9: The Drivetrain

Recall Chapter 5

Page 4: Lesson 9: The Drivetrain

Input from Engine to Transmission

Page 5: Lesson 9: The Drivetrain

Transmission Gears and Output

A transmission has gears (like a bicycle) which provide different output ratios.

Page 6: Lesson 9: The Drivetrain

Output Ratios

The ratio is the input of the crankshaft to the output of the transmission

1st Gear might have a 4:1 ratio ◦ (4,000 RPM input would have 1,000 RPM output)

2nd Gear might have a 3:1 ratio 3rd Gear might have a 2:1 ratio 4th Gear might have a 1:1 ratio

◦ Aka direct drive, there is no gear reduction

Overdrive, 0.75:1 ratio (better gas mileage)

Page 7: Lesson 9: The Drivetrain
Page 8: Lesson 9: The Drivetrain
Page 9: Lesson 9: The Drivetrain
Page 10: Lesson 9: The Drivetrain

Transmissions have gears

Page 11: Lesson 9: The Drivetrain

Automatic vs Manual

Automatic Transmission has “sun and planet” gears

Page 12: Lesson 9: The Drivetrain

Manual Transmission

Manual or Standard Transmission has conventional gears that are always turning when engine is running and clutch is released

Page 13: Lesson 9: The Drivetrain
Page 14: Lesson 9: The Drivetrain

Driveshaft

Driveshaft connects transmission to rear differential

Page 15: Lesson 9: The Drivetrain

Differentials

Differentials have gears◦ Transmit the direction of power 90 degrees (from driveshaft to axle)

◦ Allow an outside tire to turn faster than an inside tire during a turn

Page 16: Lesson 9: The Drivetrain
Page 17: Lesson 9: The Drivetrain
Page 18: Lesson 9: The Drivetrain

Front-wheel drive vsRear-wheel drive vs4-wheel drive

Page 19: Lesson 9: The Drivetrain

Front Wheel Drive

Transmission and differential combined into one piece called a transaxle

Page 20: Lesson 9: The Drivetrain
Page 21: Lesson 9: The Drivetrain
Page 22: Lesson 9: The Drivetrain

Notice the transfer case and 2 drive shafts in top image.

Which do you expect is a truck vs a sedan with 4-wheel drive for the snow?

Page 23: Lesson 9: The Drivetrain

Questions?

Page 24: Lesson 9: The Drivetrain

Download the ebook free

http://crawfordsautoservice.com/crawfords-auto-repair-guide-free-ebook/

Also available for print-on-demand and Kindle

Page 25: Lesson 9: The Drivetrain

Crawford’s Auto Repair

Certified technicians

Over 35 years of combined experience

We treat your vehicle as if it belonged to our own mother

High customer satisfaction (read our reviews online)

No service writers! We never try to sell unnecessary repairs.

Free Quotes and a Price Match Guarantee