Four stroke diesel engine

Diesel engine is a kind of internal combustion engine, which injects diesel into the cylinder to mix with air, and burns to obtain thermal energy into mechanical energy. That is, it relies on the gas expansion during fuel combustion to push the piston to move in a straight line, and rotates the crankshaft through the crank connecting rod mechanism, so as to output mechanical work.

Introduction to working principle of diesel engine

2、 Overall structure

The overall structure of diesel engine is generally composed of the following systems or mechanisms:

Engine body work system and fuel system

Cooling system of intake and exhaust system

Lubrication system electrical operating system

Due to the different number of cylinders, cylinder arrangement and cooling mode, there are slight differences in the structure of various models.

Introduction to working principle of diesel engine

4、 Working principle

1、 Common nouns

1. Piston stroke: the minimum linear distance between the top and bottom dead center is called piston stroke

Stroke [or stroke].

2. Working cycle: the conversion of thermal energy and mechanical energy in internal combustion engine is through live energy

The plug works in the cylinder and is completed by continuous air intake, compression, expansion and exhaust. Each such process of the machine is called a work cycle.

3. Top and bottom dead center: when the piston moves in the cylinder, the piston is in the cylinder

The highest position of is called TDC; The position of the piston in the cylinder is called the lowest dead center.