A gearbox refers to a mechanical device made up of various gears to transmit the power needed to rotate a shaft. Depending on the type of speed transmission, it is divided into a reduction gearbox and an increaser gearbox. If the speed of the driven shaft is lower than that of the drive shaft, it is called a reduction gearbox, and if it is higher, it is called an increaser gearbox. A reduction gearbox is mainly used to obtain high torque by reducing the rotation speed of the drive source (motor) to the required rotation speed, and an increase gearbox is used to obtain high-speed rotation by increasing the limited rotation speed of the drive source (motor). It is used for this purpose. Depending on the type of gear (helical gear, bevel gear, planetary gear, worm gear, etc.), it can be manufactured in various shapes.

The main function of the ball screw is to convert the rotational motion of the actuator to linear and it boasts a small precision and high strength. also implements a precision driving with minimal backlash.

The planetary roller screw is a product that implements the performance of high-speed, high-strength compare to the ball screw and now KIM has developed a variety of interfaces and planetary roller screw drive type to meet the special purpose.