What is the structure of a motorcycle?
1 Answers
Here is a detailed introduction to the structure of a motorcycle: 1. Engine Block: The engine block consists of three parts: the cylinder head, cylinder body, and crankcase. The cylinder head is cast from aluminum alloy with cooling fins. Modern four-stroke motorcycle engines adopt an overhead valve, chain-driven, overhead camshaft structure. 2. Crankshaft and Connecting Rod: The crankshaft of a motorcycle engine is of a combined type, formed by pressing together the left half-shaft, right half-shaft, and crank pin. Ball bearings are installed on the main journal of both half-shafts to support the crankshaft in the crankcase. The two ends of the crankshaft are equipped with a flywheel, magneto, and clutch driving gear, respectively. 3. Carburetor: The carburetor is a crucial component of the motorcycle's fuel supply system, located between the air filter and the engine intake. Its structure mainly consists of a float chamber and a mixing chamber. 4. Lubrication System: Four-stroke engines use a combination of splash lubrication and pressure lubrication. Two-stroke engines generally employ a mixed lubrication method, where a certain proportion of QB-grade gasoline engine oil is mixed with the gasoline. 5. Starting System: Motorcycles primarily use a kick-start mechanism. The kick-start lever drives the sector gear, starting ratchet, clutch assembly sprocket, front chain, and crankshaft sprocket to rotate the crankshaft and start the engine.