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Essential Parts of a Diesel Engine. The Diesel engine consists of the following parts:

Bedplate (engine frame) and crankcase. These two parts make a supporting structure to hold the cylinders, crankshaft and main bearings. The crankcase(mostly steel) serves as oil sump for the forced lubrication systems.

Cylinders are of cast iron. They are provided with large removable inspection doors through which the cooling spaces may be inspected and cleaned. ^Л

Cylinder covers (heads) close the top end of the cylinders.

Cylinder liners.

Piston and.piston rings. The piston is made of steel, cast iron or special alloy which is highly resistant to heat stresses. The piston rings prevent lubricating oil from penetrating into the combustion chamber.

Connecting rods. Theconnecting rod is made of steel. It connects the piston to the crank on the crankshaft.

The crankshaft is made of forged steel. It has ducts for lubrication oil to all bearings.

Valves serve to admit the air to discharge the spent or exhaust gases.

The camshaft is made of steel and is driven from the crankshaft through gear wheels. The camshaft drives the fuel pumps, one for each cylinder.

The flywheel is a heavy wheel fastened to the crankshaft. It keeps the engine running smoothly from the time of one power stroke to the next power stroke.

Crosshead and a piston rod. Large-size diesels are often double-acting. So they have a crosshead and a piston rod.

Дата добавления: 2015-07-20