Reduction gearboxes, also known as torque multipliers or speed reducers, are employed to reduce the output speed of the motor. Reduction gearboxes are very simple to manufacture, such as a gear train between a motor and machinery.
The ratio of the outputs to the input gear is such that it allows the output shaft to move more slowly, thereby supplying increased torque and reduced speed.
Some types of reduction gearboxes operate as a gear train between different parts, but regardless of complexity, a reduction is possible because the output section has more teeth than the inputs section, allowing the outputs gears to move more slowly. Speed decreases, and torque increases.