A reduction drive is a mechanical device to shift rotational swiftness. A planetary decrease drive is a little scale edition using ball bearings in an epicyclic arrangement instead of toothed gears.

Reduction drives are used in engines of all types to increase the quantity of torque per revolution of a shaft: the gearbox of any car is a ubiquitous exemplory case of a reduction drive. Common home uses are washers, meals blenders and window-winders. Reduction drives are also utilized to diminish the rotational acceleration of an input shaft to a proper output speed. Reduction drives can be a gear train style or belt driven.

Planetary reduction drives are typically attached between your shaft of the adjustable capacitor and the planetary gearbox tuning knob of any kind of radio, to allow fine adjustments of the tuning capacitor with soft actions of the knob. Planetary drives are found in this situation to avoid “backlash”, making tuning easier. If the capacitor drive provides backlash, when one attempts to tune in a station, the tuning knob will feel sloppy and it will be hard to perform small adjustments. Gear-drives could be made to haven’t any backlash by using split gears and spring tension but the shaft bearings need to be very precise.