Cylinder liner is a cylindrical parts, put in the body of the cylinder block hole, fixed on the cylinder head of compaction. The piston reciprocating motion in its hole, its outer cooling water cooling.The piston is mainly can be divided into piston head and piston head and piston skirt three parts. The piston in the cylinder combustion pressure is the main purpose of, and the force through the piston pin and the crankshaft connecting rod. In addition, the piston and cylinder head, cylinder wall of combustion chamber.Piston pin is installed on the piston skirt of cylindrical pin, it through the connecting rod little head middle hole, used to connect the piston and connecting rod, the piston under the gas force to the connecting rod. In order to lose weight, piston pin generally made of high quality alloy steel, and made into hollow.Piston Ring (Piston Ring) is used for embedding metal Ring inside the Piston groove

Piston ring is a bigger outward expansion deformation of the elastic metal ring, it is assembled into section and its corresponding circular groove. Reciprocating and rotating movement of the piston ring, depending on the pressure difference between the gas or liquid, in ring cylindrical surface and cylinder and ring and ring groove formed between a lateral seal.