Core components of diesel engine

The core components of diesel engine are crankshaft, cylinder liner and piston.

1. Engine is a kind of machine that converts the heat energy generated by fuel combustion into mechanical energy. The engine with diesel as fuel is called diesel engine for short. Its specific structure includes crank connecting rod mechanism, valve distribution mechanism, fuel supply system, lubrication system and cooling system. Crank connecting rod mechanism, valve train and fuel supply system are the three basic parts of diesel engine. They cooperate with each other to complete the working cycle of the engine and realize energy conversion.

2. Crankshaft is the most important component in the engine, and it is also the most precise single component in the automobile engine. The crankshaft bears the force transmitted by the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine. The stress of crankshaft is extremely complex. It works under the joint action of periodically changing gas pressure, reciprocating inertia force and its torque, and bears huge alternating bending and torsion loads. At the same time, it is also a slender high-speed rotating part, so it needs strict dynamic balance, and bending and distortion are not allowed to exceed a certain value.

3. The cylinder block is the skeleton of an internal combustion engine. All other parts of the diesel engine are installed on the cylinder block by screws or other connection methods. The function of the piston and the piston ring installed in its ring groove is to transfer the combustion pressure of fuel and air to the connecting rod connected to the crankshaft. In a diesel engine, the camshaft operates the inlet and exhaust valves; In some diesel engines, it can also drive the lubricating oil pump or fuel injection pump. The camshaft is timed by the crankshaft through the timing gear or camshaft gear exposed to the front gear of the crankshaft.