A narrow V-belt is a type of belt with a smaller cross-sectional size, mainly used to transmit smaller power and torque. Its working surface is a V-shaped structure composed of two narrower slopes, with a smaller contact area with the pulley, thus being able to withstand smaller loads. Meanwhile, due to its narrow size, it has good flexibility during operation and is suitable for use in small space situations.

V-belt transmission relies on the frictional force generated by the compression between the two sides of the V-belt and the side of the wheel groove for power transmission. Compared with flat belt transmission, V-belt transmission has higher friction and can therefore transmit greater power. The V-belt has a more compact structure than a flat belt, and it is a seamless transmission belt, so the transmission is smoother, making it the most widely used type of belt transmission.