What is a Transmission Like?
3 Answers
Transmission is the device located between the clutch and the central drive. It is a device that changes the speed ratio and direction of motion. Used in automobiles, tractors, ships, machine tools, and various machines, it alters the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. Gear-driven transmissions generally consist of a housing and several gear pairs. Introduction to Automotive Transmission: Automotive transmission mainly refers to the gearbox of a car, which is divided into manual and automatic types. Manual transmissions are primarily composed of gears and shafts, achieving speed and torque changes through different gear combinations. Automatic transmissions (AT), on the other hand, consist of a torque converter, planetary gears, a hydraulic torque variation system, and a hydraulic control system, achieving speed and torque changes through hydraulic transmission and gear combinations. Function of Automotive Transmission: The engine's output speed is very high, with maximum power and maximum torque occurring within a certain speed range. To optimize engine performance, the transmission was developed to coordinate the engine's speed with the actual driving speed of the wheels.
The transmission is typically installed behind the engine and in front of the drive wheels, shaped like a rectangular metal box. Its casing is usually made of aluminum or steel, with a smooth surface featuring cooling fins or bolted fastenings to prevent heat buildup. It can be seen when opening the hood, with its size varying by vehicle model—compact cars may have one as small as a watermelon, while SUVs feature larger units. Inside lies a set of gear systems: manual transmissions include a clutch mechanism connected to the pedal, while automatics house planetary gear sets and a torque converter. The robust design protects delicate components from dust and impacts. Routine maintenance doesn’t require daily inspection, but mechanics disassemble it to check gear wear during repairs. Its streamlined appearance integrates into the chassis without compromising cabin space, serving as one of the modern car’s vital organs to ensure smooth power delivery to the wheels.
The transmission is designed with a highly practical appearance, resembling a sealed box attached to the rear of the engine, effectively isolating internal gear noise and protecting the lubrication system. Its shape tends to be either square or slightly curved, constructed from durable metal with raised heat-dissipating structures on the surface to prevent heat damage. From the driver's seat, the gearshift lever connects to it in a straightforward manner, while internally it's complex—manual versions feature synchronizers and shafts, whereas automatic ones incorporate electronic control modules. The design philosophy prioritizes safe and efficient power transfer with minimal maintenance, favoring durability over flashy aesthetics. Mechanics often praise its structure for making oil changes easier, and after multiple inspections, I can confirm its rust-proof surface coating is excellent.
