L28/32 diesel engine accessories introduces the basic structural parameters of top dead center and bottom dead center of diesel engine

The main engine has a main shaft, which passes through the hull at the stern and is attached to the propeller. After the main engine starts up, the main shaft is driven to rotate, the main shaft drives the propeller to rotate, and the hull can overcome the resistance of the ship to move forward. This is the most basic principle that the ship host can promote the ship forward, probably in junior high school physics learning stage have been exposed to. The main engine plays an important role, the structure is complex, and the technical content of fault and maintenance work is high.

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Refers to the straight line distance between the piston from top dead center to bottom dead center, this S refers to the English Stroke. The piston travels the length of one stroke, and the crankshaft turns exactly 180°, so the piston moves one stroke, which is equivalent to the crankshaft turning 180°CA.

Stroke S can be understood as, when the piston is at top dead center, the crankshaft is at the Z high point; When the piston moves down to the bottom dead center, the crankshaft is at the Z low point; So, this is equal to twice the radius of the crankshaft R, which is S= 2R.

The length of the stroke is an important indicator in the design and performance parameters of the diesel engine, which determines the cylinder volume and cylinder compression ratio that can be accommodated in each cylinder, thus affecting the output power, torque and fuel efficiency of the engine.