Several processes have to happen in order for a vehicle to move.
|Power Transfer Steps|
|1||Fuel is stored as chemical energy in the gas tank.|
|2||Fuel is transported to the engine by a fuel pump.|
|3||Air-fuel mixture enters the engine.|
|4||Electrical energy is used to create a spark at the spark plug.|
|5||Combustion occurs, converting the chemical energy to kinetic energy. The piston moves linearly, reciprocating up and down or back and forth.|
|6||The reciprocating motion of the pistons is converted to rotary (circular) motion of the crankshaft.|
|7||The crankshaft’s rotary motion turns the transmission.|
|8||On front-wheel drive (FWD) vehicles, rotary motion is transferred through a transaxle (transmission and differential combined). From the transaxle, rotary power is moved through constant velocity (CV) shafts.|
On rear-wheel drive (RWD) vehicles, rotary motion is transferred from the transmission through the drive shaft then to a differential and final drive assembly. In this situation, the differential changes the power flow 90° and allows the drive wheels to turn at different speeds when cornering. Power is transferred from the differential to axle shafts.
|9||The axle shafts or CV shafts turn the wheels.|
|10||The rotary motion of the wheels converts to linear motion on the roadway.|