Mechanical components are the basic units that constitute mechanical equipment and the core carriers for realizing mechanical functions. They are combined and assembled to form complete mechanical systems, undertaking key roles such as power transmission, motion control, and structural support. By definition, mechanical components refer to indivisible independent manufacturing units within machinery, including both standard parts (such as bolts, bearings, and gears) and non-standard customized parts (such as specially shaped brackets and connectors). Their core characteristics lie in 'functionality' and 'interchangeability'-the former requiring components to precisely fulfill their design tasks, and the latter enabling mass production and maintenance replacement through standardized design.
Mechanical components can be classified in various ways. By function, they can be divided into transmission components (gears, chains, couplings), support components (shafts, bearings, frames), connection components (bolts, pins, rivets), and sealing components (oil seals, gaskets), etc. By material, they can be divided into metal components (steel, cast iron, aluminum alloys), non-metallic components (plastics, rubber, ceramics), and composite material components. For example, the crankshaft in a car engine is a transmission metal component that needs to withstand high temperature, high pressure and reciprocating motion; while the sealing ring in a washing machine is a non-metallic sealing component that needs to be resistant to chemical corrosion and have elastic deformation capabilities.