What is the working principle of a CVT transmission?

[Phil]

The working principle of a CVT transmission is: The drive pulley of the CVT is divided into movable left and right halves. The conical discs can be tightened or expanded under hydraulic pressure, squeezing the steel belt chain to adjust the width of the V-shaped groove. When the conical discs move inward and tighten, the steel belt chain is pushed outward from the center under the pressure of the discs. Conversely, it moves inward toward the center. As the diameter of the disc driven by the steel belt chain increases, the transmission ratio changes. The functions of the transmission are: 1. To change the transmission ratio to meet the traction needs under different driving conditions; 2. To enable reverse driving, meeting the need for the vehicle to move backward; 3. To interrupt power transmission; 4. To achieve neutral gear.

[HarrisonLee]

I just bought a car with a CVT transmission, and the driving experience is incredibly smooth! The working principle is simple: the engine is connected to an adjustable pulley, another pulley is connected to the drive wheels, and they are linked by a metal belt. They can seamlessly adjust their positions, changing the gear ratio, making it feel like driving without any gear shifts. The engine speed always stays at the most fuel-efficient point—for example, when accelerating uphill, power is delivered directly without the jerks of an automatic transmission. Driving in the city is super convenient, with fuel consumption dropping by 10%, and a full tank can take me dozens of kilometers farther on long trips. But be sure to maintain the belt, as it may wear over time. Regular checks can extend its lifespan, enhancing both driving pleasure and safety overall.

[Alexa]

After driving for over a decade, I've gained a deep understanding of how CVT transmissions work. Essentially, they transfer power through two variable-diameter pulleys - one connected to the engine and the other to the wheels, linked by a chain or belt. When you press the accelerator, the pulley widths automatically adjust to change the ratio, keeping engine RPM stable to optimize power output and avoid waste. This design enables seamless gear shifts, making it particularly suitable for congested roads to reduce driving fatigue. From my experience, I've found CVTs highly reliable and relatively low-cost, though maintenance requires attention to belt wear or slippage. Regular belt inspection and lubrication can prevent unexpected issues. Overall, it significantly improves driving efficiency.

[DiValentina]

The working principle of CVT transmissions is quite interesting. The engine is connected to the active pulley, and the driven end is another pulley. The belt changes its position to continuously adjust the diameter ratio. This way, power transmission occurs without fixed gears, allowing the engine to always operate within its efficient RPM range, maximizing fuel utilization. The driving experience feels smooth during acceleration without any jerking, especially in city driving where it saves fuel. I've driven it a few times, and actual tests showed a fuel consumption reduction of about 12%. Maintenance is simple, requiring only regular oil changes. The overall design is clever, enhancing driving comfort.