Reduction Gears

A reduction gear is part of a mechanical system of gears and shafts that serves the primary purpose of slowing things down within a machine so that energy one place can be transferred and used in another. Reduction gears are most commonly seen in car and truck drivetrains, and in these settings they reduce the high rotational speeds of the engine and convert them to a usable, slower speed that the tires can interpret and safely use.

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Detailed Description for Reduction Gears

A reduction gear is an arrangement by which an input speed can be lowered for a requirement of slower output speed, with same or more output torque. Reduction gear assembly consists of a set of rotating gears connected to a wheel work. The high speed incoming motion from the wheel work is transmitted to the set of rotating gears, wherein the motion or torque is changed. The number of gears used in the reduction gear assembly depends on the output speed requirement of the application. The reduction gear assembly is usually known as reduction gear box.

Types of Reduction Gears

There are mainly two types of reduction gears:

         Single reduction gear

         Double reduction gear


Single Reduction gear

This arrangement consists of only one one pair of gears. The reduction gear box consists of ports through which the propeller shaft and engine shaft enters the assembly. A small gear known as a pinion is driven by the incoming engine shaft. The pinion directly drives a large gear mounted on the propeller shaft. The speed is adjusted by making the ratio of the speed reduction to the diameter of pinion and gear proportional. Generally, a single gear assembly has a gear double the size of a pinion.




Double Reduction gear


Double reduction gears are generally used in applications involving very high speeds. In this arrangement the pinion is connected to the input shaft using a flexible coupling. The pinion is connected to an intermediate gear known as the first reduction gear. The first reduction gear is then connected to a low speed pinion with the help of one more shaft. This pinion is connected to the second reduction gear mounted directly on the propeller shaft. Such arrangement facilitates the reduction of speed to a ratio as high as 20:1 .



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