Post on 04-Jul-2015
description
Free Auto Repair Classes.Lesson 9: The Drive Train
Jeff CrawfordCrawford’s Auto Repair
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
Recall Chapter 5
Input from Engine to Transmission
Transmission Gears and Output
A transmission has gears (like a bicycle) which provide different output ratios.
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)
Transmissions have gears
Automatic vs Manual
Automatic Transmission has “sun and planet” gears
Manual Transmission
Manual or Standard Transmission has conventional gears that are always turning when engine is running and clutch is released
Driveshaft
Driveshaft connects transmission to rear differential
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
Front-wheel drive vsRear-wheel drive vs4-wheel drive
Front Wheel Drive
Transmission and differential combined into one piece called a transaxle
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?
Questions?
Download the ebook free
http://crawfordsautoservice.com/crawfords-auto-repair-guide-free-ebook/
Also available for print-on-demand and Kindle
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