Which type of automatic transmission uses a belt and pulley system?

The type of automatic transmission that uses a belt and pulley system is the continuously variable transmission (CVT). A CVT offers seamless acceleration without the distinct gear shifts found in traditional automatic transmissions. This is achieved through the use of a belt and pulley mechanism, which allows the transmission to adjust ratios continuously.

In a CVT, the drive pulley and driven pulley adjust their diameters to change the effective gear ratio, providing a smooth transition as speed increases or decreases. This design enhances fuel efficiency and improves performance compared to conventional transmissions that have set gear ratios.