The pistons are a reciprocating motion part in the cylinder block of automobile engine. The basic structure of piston can be divided into top, head and skirt. The top of the piston is the main part of the combustion chamber, and its shape is related to the type of combustion chamber selected. Flat-top piston is commonly used in gasoline engines, which has the advantage of small heat absorption area. There are many kinds of pits on the top of piston of diesel engine. The specific shape, position and size of pits must be in accordance with the requirements of mixture formation and combustion of diesel engine.
Because the piston of internal combustion engine works under the condition of high temperature, high pressure and high load, the requirement of piston is relatively high, so the classification of piston of internal combustion engine is mainly discussed.
1. According to the fuel used, it can be divided into gasoline engine pistons, diesel engine pistons and natural gas pistons.
2. According to the material, it can be divided into cast iron piston, steel piston, aluminium alloy piston and composite piston.
3. According to the process of making, it can be divided into gravity casting piston, squeeze casting piston and forging piston.
4. According to the working condition, it can be divided into two categories: non-pressurized piston and pressurized piston.
5. According to the usage, it can be divided into car piston, truck piston, motorcycle piston, marine piston, tank piston, tractor piston, lawn mower piston and so on.
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