文档介绍：Engine Technology
Table of Contents
Engine Basics
Basic Engine Parts
Engine Valve Train and Ignition Systems
Cooling System
Air-intake System
Starting System
Fuel System
Lubrication System
Exhaust System
Engine Basics
A four-bustion cycle (Otto cycle) is to convert gasoline into motion.
* In an engine the linear motion of the pistons is converted into rotational motion by the crankshaft (Part P in the Figure).
Basic Engine Parts
In a multi-cylinder engine, the cylinders usually are arranged in one of three ways: inline, V or flat .
Inline
V
Flat
Basic Engine Parts (cont)
Spark plug
The spark plug supplies the spark that ignites the air/fuel mixture so bustion can occur. The spark must happen at just the right moment for things to work properly.
Valves
The intake and exhaust valves open at the proper time to let in air and fuel and to let out exhaust. Note that both valves are closed pression bustion so that bustion chamber is sealed.
Piston
A piston is a cylindrical piece of metal that moves up and down inside the cylinder
Basic Engine Parts (cont)
Piston rings
Piston rings provide a sliding seal between the outer edge of the piston and the inner edge of the cylinder. The rings serve two purposes:
They prevent the fuel/air mixture and exhaust in bustion chamber from leaking into the sump pression bustion.
They keep oil in the sump from leaking into bustion area, where it would be burned and lost.
Basic Engine Parts (cont)
Crankshaft The crankshaft turns the piston's up and down motion into circular motion just like a crank on a jack-in-the-box does.
Sump The sump surrounds the crankshaft. It contains some amount of oil, which collects in the bottom of the sump (the oil pan).
Connecting rod The connecting rod connects the piston to the crankshaft. It can rotate at both ends so that its angle can change as the piston moves and the crankshaft rotates.
Engine Valve Train and Ignition Systems
The valve train consists o