Chapter 2 Crank-connecting rod mechanism and parts Section 1 Engine body group The engine body group consists mainly of engine body. cylinder jacket, cylinder cap,cylinder gasket and lower crankcase. 1.Engine Body and Lower Crankcase (1)Engine body The common forms of the engine body structure have the general type,gantry type and tunnel-type. Figure 2.1 The forms of the engine body structure 1.cylinder block 2.water jacket 3.camshaft hole seat 4.reinforcing rib 5.cylinder jacket 6.main bearing seat 7.main bearing seat hole 8.working surface of installing oil pan 9.working surface of installing main bearing cap 机械电子工程学度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 2 Crank-connecting rod mechanism and parts The engine body group consists mainly of engine body、 cylinder jacket, cylinder cap, cylinder gasket and lower crankcase. 1. Engine Body and Lower Crankcase Section 1 Engine body group (1) Engine body The common forms of the engine body structure have the general type, gantry type and tunnel-type. Figure 2.1 The forms of the engine body structure 1. cylinder block 2. water jacket 3. camshaft hole seat 4. reinforcing rib 5. cylinder jacket 6. main bearing seat 7. main bearing seat hole 8. working surface of installing oil pan 9. working surface of installing main bearing cap
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 University
Automobile 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
Chapter 2 Crank-connecting rod mechanism and parts Section 1 Engine body group (2)Cylinder jacket Water-cooled internal combustion engine cylinder jacket has wet and dry-wet cylinder jacket. Wet cylinder jacket extine contacts directly with the cooling water,which can achieve good heat dissipation,uniform cooling,easily processed,and easy assembly. jacket thickness 5-9 mm. Dry cylinder jacket extine does not contact directly with the cooling water.Heat dissipation is poor,the outer circle of cylinder jacket and the inner hole of the cylinder block must be finishing,and assembly is not convenient.However,the structure is compact,tightness is good,and intensity and stiffness of the body are very high after dry cylinder jacket is loaded.jacket thickness 1-3 mm. 械电子工程学 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 2 Crank-connecting rod mechanism and parts Wet cylinder jacket extine contacts directly with the cooling water, which can achieve good heat dissipation, uniform cooling, easily processed, and easy assembly. jacket thickness 5-9 mm. Dry cylinder jacket extine does not contact directly with the cooling water. Heat dissipation is poor, the outer circle of cylinder jacket and the inner hole of the cylinder block must be finishing, and assembly is not convenient. However, the structure is compact , tightness is good, and intensity and stiffness of the body are very high after dry cylinder jacket is loaded.jacket thickness 1-3 mm. (2) Cylinder jacket Water-cooled internal combustion engine cylinder jacket has wet and dry-wet cylinder jacket. Section 1 Engine body group
Chapter 2 Crank-connecting rod mechanism and parts Section 1 Engine body group (a) (b) Figure 2.2 Water-cooled cylinder jacket (a)Wet cylinder jacket (b)Dry cylinder jacket 1.cylinder jacket 2.cylinder block 3.cooling water jacket 4.sealing ring 机械与电子工程度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 2 Crank-connecting rod mechanism and parts Figure 2.2 Water-cooled cylinder jacket (a) Wet cylinder jacket (b) Dry cylinder jacket 1. cylinder jacket 2. cylinder block 3. cooling water jacket 4. sealing ring Section 1 Engine body group
Chapter 2 Crank-connecting rod mechanism and parts Section 1 Engine body group 3.Cylinder Head and Cylinder Gasket 3.1 Cylinder head The main function of cylinder head is ⊙ to seal the upper cylinder ,and cylinder head,the piston top and part of cylinder wall constitute the combustion chamber.Its materials are mostly cast iron or aluminum for 9 casting it. Figure 2.3 Cylinder head 1.tappet hole 2.cylinder head bolt hole 3.exhaust valve seat hole 4.intake valve seat hole 5.cooling water hole 6.cooling water outflow line 7.fuel injector hole 8.airway 业机械电子工程学度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 2 Crank-connecting rod mechanism and parts 3. Cylinder Head and Cylinder Gasket 3.1 Cylinder head The main function of cylinder head is to seal the upper cylinder ,and cylinder head、 the piston top and part of cylinder wall constitute the combustion chamber. Its materials are mostly cast iron or aluminum for casting it. Figure 2.3 Cylinder head 1. tappet hole 2. cylinder head bolt hole 3. exhaust valve seat hole 4. intake valve seat hole 5. cooling water hole 6.cooling water outflow line 7. fuel injector hole 8. airway Section 1 Engine body group