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The piston crown is an integral part of the combustion chamber, so it is often made into different shapes. The piston crown of gasoline engine usually adopts flat or concave crown, so as to make the combustion chamber compact in structure, small in heat dissipation area and simple in manufacturing process. Crown piston is often used in two stroke gasoline engine. The piston crown of diesel engine is often made into various pits. The piston head is the part above the piston pin seat. The piston ring is installed on the piston head to prevent the high temperature and high pressure gas from entering the crankcase and the engine oil from entering the combustion chamber; Most of the heat absorbed by the top of the piston is also transferred to the cylinder through the piston head, and then through the cooling medium. The number of piston rings depends on the sealing requirements, which is related to the engine speed and cylinder pressure. The number of rings of high-speed engine is less than that of low-speed engine, and the number of rings of gasoline engine is less than that of diesel engine. General gasoline engine adopts two gas rings and one oil ring; The diesel engine has three gas rings and one oil ring; Low speed diesel engine adopts 3-4 gas rings. In order to reduce the friction loss, the height of the ring should be reduced as far as possible, and the number of rings should be reduced under the condition of ensuring the sealing. All parts below the piston ring groove are called piston skirt. Its function is to guide the piston to make reciprocating motion in the cylinder and bear the side pressure. When the engine is working, the piston will bend and deform because of the gas pressure in the cylinder. After the piston is heated, the expansion of the piston pin is greater than that of other parts because of the more metal at the piston pin. In addition, the piston will produce extrusion deformation under the action of side pressure. As a result of the above deformation, the cross section of the piston skirt turns into an ellipse of the long axis in the direction of the piston pin. In addition, due to the uneven distribution of temperature and mass along the axis of the piston, the thermal expansion of each section is large at the top and small at the bottom.
details1. Our packing uses export wooden cases, plastic boxes, cartons or pallets. All the package are very strong, the wooden box is firmly bound, the package is covered with a waterproof film to prevent water or damage during transportation.Before packing, we can also stick corresponding labels and shipping marks according to your needs. All our goods are well packed.
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