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The gearbox consists of two main parts: the gear transmission mechanism and the gearshift control mechanism.
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The primary function of the variable-speed transmission mechanism is to alter both the magnitude and direction of torque and rotational speed; meanwhile, the main role of the control mechanism is to manage the transmission unit, enabling the adjustment of the gearbox's gear ratio—and thus facilitating gear shifts—to achieve variations in both speed and torque.
The simple-type transmission offers advantages such as high efficiency, a straightforward design, and ease of use. However, it has fewer gears and a limited gear ratio range (resulting in modest traction and speed capabilities), making it suitable only for certain machine tools with a limited number of gears. If the goal is to expand the gear ratio range, this would inevitably lead to a larger transmission size and increased shaft span. To achieve both more gears and avoid excessively wide shaft spans, a compound transmission can be employed. A compound transmission typically consists of two simple-type gearboxes combined together—where the gearbox with more gears is referred to as the main transmission, and the one with fewer gears is called the auxiliary transmission.
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