The basic structure of an automobile mainly consists of four core components: the engine, chassis, body, and electrical equipment. As the power core, the engine includes two major mechanical structures-the crankshaft connecting rod mechanism and the valve train-as well as five systems: fuel supply, cooling, lubrication, ignition (exclusive to petrol engines), and starting. Diesel engines, due to the compression ignition principle, do not require an ignition system. As a supporting framework, the chassis integrates the transmission system (clutch, transmission, drive axle, etc.), running system (frame, suspension, wheels), steering system (steering gear, transmission mechanism), and braking system (service braking and parking braking), which together enable power transmission, driving stability, and safety control. The body provides riding space and cargo-carrying functions, covering the shell structure, doors and windows, seats, and comfort configurations. Electrical equipment uses the battery and generator as power sources to drive the starting system, lighting signals, and on-board electronic devices. Understanding these basic structures is helpful for daily maintenance and troubleshooting. For example, regular inspection of coolant level can prevent engine overheating, while maintenance of the braking system is directly related to driving safety.
