Chapter 2 Crank-connecting rod mechanism and parts Section 1 Engine body group (2)Lower crankcase It is often called oil pan,which is installed in the lower part of the body that is filled with oil for lubrication. 2.Cylinder and Cylinder Jacket (1)Cylinder Cylindrical cavity,which is guiding the movement of the piston in it is called cylinder. Cylinder must meet the demands of high temperature resistance,abrasion resistance and corrosion resistance. Generally adopting high quality gray cast iron or high quality alloy cast iron of cast iron by adding a small amount of nickel,molybdenum and other elements. Making cylinder and the body as a whole one is very few,mostly adopting the removable modular structure of the cylinder and body,that is,cylinder jacket made of high-quality materials is inlaid into the cylinder body of the body. 机械特电子工程学理 Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Chapter 2 Crank-connecting rod mechanism and parts (2) Lower crankcase It is often called oil pan, which is installed in the lower part of the body that is filled with oil for lubrication. 2. Cylinder and Cylinder Jacket (1) Cylinder Cylindrical cavity，which is guiding the movement of the piston in it ，is called cylinder. Cylinder must meet the demands of high temperature resistance、 abrasion resistance and corrosion resistance. Generally adopting high quality gray cast iron or high quality alloy cast iron of cast iron by adding a small amount of nickel, molybdenumand other elements. Making cylinder and the body as a whole one is very few, mostly adopting the removable modular structure of the cylinder and body, that is, cylinder jacket made of high-qualitymaterials is inlaid into the cylinder body of the body. Section 1 Engine body group