汽车构造.ppt

Chapter 3 Connecting Rod ? Engine body ? Piston and connecting rod ? Crankshaft and flywheel Unit 1 Introduction Function ? Convert thermal energy into mechanical energy used to move the piston up and down. ? Convert reciprocating motion of the piston into rotary motion of the crankshaft and produce power. Components ? Engine body ? Piston and connecting rod ? Crankshaft and flywheel Operating condition Withstanding mechanical load : ? gas pressure 、 inertia force 、 centrifugal force 、 friction force ? Shock and vibration Unit 2 Engine ponents : crankcase cylinder block 气缸垫 cylinder head cylinder oil passage and water passage oil pan Cylinder block and crankcase cylinder block of audi100 Classification 1、 water-cooling 2、 air-cooling cooling fin cylinder block and head of air-cooling engine With respect to cooling method With respect to cylinder arrangement In-line V-type Horizontally opposed type Crankcase ( oil pan ) Function : enclosing the crankshaft Oil pan of the engine Cylinder head Function : Seal the top the cylinder and form the combustion chamber with the piston and the cylinder Operating condition : much heat load Material : grey iron or alloy iron aluminium