What is the principle of continuously variable transmission?

[DelParker]

The principle of continuously variable transmission: It uses two transmission pulleys with variable diameters and a transmission belt in between to transmit power. The two ends of the belt are wound around conical pulleys, and the outer diameter of the pulleys is continuously varied by hydraulic pressure. CVT technology employs a transmission belt working with variable-diameter driving and driven pulleys to transmit power, enabling continuous changes in the transmission ratio. This achieves optimal matching between the transmission system and engine conditions. The difference between CVT and stepped transmissions lies in the fact that its transmission ratio is not discrete points but a series of continuous values. The CVT structure is simpler than traditional transmissions, with a more compact size. It neither has the multiple gear pairs of manual transmissions nor the complex planetary gear sets of automatic transmissions. It mainly relies on the driving pulley, driven pulley, and metal belt to achieve stepless variation of the speed ratio.

[DeMarley]

I know that Continuously Variable Transmission is abbreviated as CVT, and its principle involves the combination of two adjustable conical pulleys and a steel belt or chain. When I drive a CVT car, it feels exceptionally smooth because there are no fixed gear shifts like in traditional transmissions. The distance between the conical pulleys can vary continuously, much like a stretchable rubber band, allowing the steel belt to slide and infinitely adjust the gear ratio, keeping the engine always running at the most fuel-efficient RPM. When I was younger, I worked on various types of transmissions, and the design of CVT is much simpler than old mechanical ones, offering quicker response and smoother operation. However, don’t overlook the potential wear of the steel belt—regular maintenance is a must. Additionally, some high-end cars now use chains for better durability. Overall, CVT is fantastic for city driving, offering low fuel consumption and a comfortable ride, though it might get a bit noisy during aggressive driving.

[SabrinaRose]

I absolutely adore the smooth acceleration brought by CVT. The principle is actually super cool: two rotating cones with a belt sliding between them enable seamless changes in gear ratio, eliminating any sense of gear shifts! When driving a modern CVT car, the engine RPM remains stable with minimal fluctuations, saving fuel and keeping things quiet—even in traffic jams, it's not tiring. My hybrid car pairs a CVT with an electric motor, and the driving experience is simply exhilarating. However, remember not to floor the accelerator for extended periods to avoid overheating the steel belt. Compared to automatic transmissions, CVT maintenance costs might be a bit higher, but the improvement in fuel efficiency is significant. In the long run, it helps us young people save on commuting fuel costs while reducing carbon emissions. More and more new cars are adopting this technology—it's definitely the future trend in driving.

[DiJason]

The principle of CVT is not complicated; it simply involves two conical pulleys and a belt sliding to change the gear ratio. I've used a family car with CVT for many years, and the shifting is continuous and smooth, preventing passengers from getting carsick. It's simpler and more reliable than automatic transmissions, with lower costs and better fuel efficiency, making it especially suitable for urban commuting. During maintenance, the main focus is checking the belt and fluids—just don't neglect routine upkeep. Many mainstream family cars, especially Japanese brands, use CVT for its affordability and durability. Overall, it's a solid choice.