Here's a breakdown of what the crankcase does and what it contains:
Functions:
* Houses the Crankshaft: The crankcase provides a secure and rigid structure that supports the crankshaft, which converts the reciprocating motion of the pistons into rotational motion.
* Contains Lubricating Oil: The crankcase holds the engine oil that lubricates all the moving parts within the engine.
* Provides a Sealed Environment: The crankcase forms a sealed chamber, preventing the escape of oil and combustion gases.
* Supports the Engine: The crankcase acts as a strong foundation for the entire engine block, bearing the weight of the other components.
* Houses Other Components: Besides the crankshaft, the crankcase also houses components like the connecting rods, main bearings, and oil pump.
Components:
* Lower Crankcase: The bottom portion of the crankcase, typically made from cast iron or aluminum, supports the crankshaft and houses the oil pan.
* Upper Crankcase: The top portion of the crankcase, which may be separate or integrated with the lower crankcase. It houses the cylinders and cylinder head.
* Oil Pan: A container attached to the lower crankcase that stores the engine oil.
* Oil Sump: The lowest point in the crankcase where the oil collects.
* Oil Galleries: Channels within the crankcase that carry lubricating oil to the bearings.
Importance:
The crankcase plays a critical role in the operation and longevity of an engine. It provides the necessary support, lubrication, and containment for the essential moving parts to function smoothly and efficiently.
Note: The crankcase is often referred to as the "engine block" or "cylinder block" because it usually houses the cylinders as well.
