The main source of power to drive an automobile is its engine. Within the engine there are four (or more) number of cylinders with pistons plying up and down. The cylinder itself is a combustion chamber. Fuel inside this combustion chamber is compressed to a very high degree by inward (upward) motion of the piston and suddenly the compressed fuel (air-fuel mixture) is ignited whereby a powerful combustion (explosion) take places.
The combustion force pushes the piston back with tremendous pressure. The piston pushes the connecting rod of the crankshaft and as a result, the crankshaft starts rotating. The rotation of the crankshaft is transmitted, via the clutch to the transmission gearbox.
The piston continues to move up and down, all pistons in all the cylinders and the automobile continuously gets power to move on. In accordance with the engagements of the transmission gearbox, high or low speed (rotation), as the car driver desires, is transmitted to the propeller shaft. from propeller shaft the power (and rotation), through the differential gearbox, finally reaches the rear axle of the car so that the 2 rear wheels rotate and the vehicles starts moving. The motor vehicle engine is a heat engine. The differential gear box ensures smooth motion of the automobile when it moves in a curved path.
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