Sinotruk HOWO TX400 Euro2 4x2 WEICHAI Tractor Truck Trailer Head for Sale

China Sinotruck Hohan New 371hp 420hp 10 Wheeler 4X2 6X4 Tractor Truck Head Diesel Fuel Euro 2 Emission Standard Left for Sale

Tractor-trailer trucks function through a precision-coordinated system of components, engineered to move heavy loads efficiently. A diesel engine serves as the power source, operating on compression ignition: air is compressed in cylinders to high temperatures, then diesel fuel is injected, igniting spontaneously to drive pistons and generate rotational force.
This power is managed by a multi-speed transmission—manual or automated—adjusting torque output: lower gears deliver high torque for starting or ascending grades, while higher gears optimize fuel efficiency at cruising speeds. The drivetrain transfers this energy via a driveshaft to the differential, which splits power between rear wheels, enabling smooth turns by allowing wheels to rotate at varying speeds.
Suspensions (leaf springs or airbags) absorb road vibrations, support the vehicle’s weight, and stabilize cargo. Braking systems combine air brakes for primary stopping—using compressed air to activate brake pads—and engine brakes (e.g., Jake brakes) to regulate downhill speed, reducing wear on friction components.
The tractor-trailer connection relies on a fifth wheel, a horseshoe-shaped coupling on the tractor that locks onto the trailer’s kingpin. Electrical and air lines link the two units, synchronizing lights, signals, and brakes. This integrated design ensures the safe, efficient transport of heavy loads over long distances.