What is a Transmission?
3 Answers
Transmission is a device that changes the speed ratio and direction of motion. It is used in automobiles, tractors, ships, machine tools, and various machines to alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. A gear-driven transmission generally consists of a housing and several gear pairs. During vehicle operation, to adapt to different working conditions, the driving force and speed of the car need to vary within a certain range. However, the existing engine's torque and speed range cannot meet this requirement, hence the installation of a transmission. Currently, there are mainly five types of transmissions: AT transmission, CVT transmission, AMT transmission, dual-clutch transmission, and manual transmission. The functions of a transmission: Changing the transmission ratio between the engine and the wheels, allowing the engine to operate under optimal conditions, expanding the torque and speed transmitted to the driving wheels, and achieving different speeds; enabling the car to reverse (direction change); and allowing the engine to stop without shutting off (neutral gear setting).
The transmission in a car acts like a super regulator. I feel it most when driving a manual transmission car—it changes the engine's power output through gears, ensuring the vehicle runs smoothly whether starting, climbing hills, or cruising at high speeds. Manual transmissions require me to press the clutch to shift gears, which is more fuel-efficient but slightly more complex to operate. Automatic transmissions are much more convenient, with the computer controlling the shifting rhythm, especially making stop-and-go traffic less tiring. Common transmission issues include slipping, strange noises, or difficulty engaging gears, all of which affect driving safety. For daily maintenance, I regularly check the transmission fluid—if it's too dirty, it can damage internal components. Remember, a good transmission makes the journey smoother and more reliable—don't ignore minor issues.
In my years of repairing cars, the transmission is the core drivetrain component that distributes engine power to the wheels, selecting the appropriate gear ratio for speed and load. Automatic transmissions use computers and hydraulic systems for shifting, while manuals rely on mechanical gear sets. Common issues like oil seal leaks, gear wear, or abnormal vibrations can cause rough shifting. Early detection can save major repair costs. I advise owners to change the dedicated transmission fluid every 50,000 kilometers and keep the cooling system clean—this extends lifespan and improves fuel efficiency. If you notice rough shifting or sudden fuel consumption spikes while driving, don’t delay—visit a professional shop for inspection.
