Heavy Duty Gear Reduction Box Guide

The heavy duty reduction gear box is a system where the input speed can be lowered to achieve a lower output speed with the same or greater output torque. The reduction gear assembly consists of a set of rotary gears connected to the wheel mechanism. High-speed traffic from the work of the wheel is transferred to a set of rotating gears in which the movement or torque changes. The number of gears used in the reduction gear assembly depends on the required output speed of application. The reduction gear assembly is usually known as the reduction gear box.

The reason to use a reduction gear

To understand why a reduction gear was used in individual machines, we will take the example of a ship with fast turbines. The ship's basic requirement is that a steam turbine should operate at a relatively high speed range to achieve high efficiency. However, effective propeller operation requires a relatively low speed range.

Types of Reduction Gears

Single Reduction gear
This arrangement consists of only one pair of gears. The reduction gear consists of holes through which the drive shaft and motor shaft enter the assembly. The small gear, known as pinion, is driven by the incoming motor shaft. The gear directly drives a large gear mounted on the drive shaft. The speed is regulated, proportionally reducing the speed to the diameter of the pinion and gear. In general, a single gear assembly has a gear twice as large as a pinion.

Double Reduction gear
Double reduction gearboxes are usually used in applications requiring very high speeds. In this arrangement, the pinion is connected to the input shaft with a flexible coupling. The gear is connected to an intermediate gear known as the first reduction gear. The first reduction gear is then connected to the low speed pinion by means of another shaft. This gear is connected to a second reducer mounted directly on the drive shaft. This arrangement helps reduce the speed to a ratio of up to 20: 1.

Helical Gear Reducers
Unlike worm gears, helical gears can move in both directions. Usually cut at an angle of 15 ° to 30 °, helical gears have their name from the interaction between two teeth, when the teeth form a helix, when they mesh during movement.

Known for smooth and quiet operation, cylindrical gears use their unique design to create a significant thrust (the sum of which is based on the gear tooth angle). Helical gear speed reducers are considered ideal for heavy duty applications because they usually have many teeth in contact at the same time to distribute the load and maintain stability.


Compared with the worm gear options, helical speed reductions have a narrower range of applications and are mainly used in the automotive sector due to their quiet nature and high thrust. Applications of helical gear speed reducers include:

● Conveyor systems
● Packaging
● Lifting/pulling (i.e. cranes, winches, hoists)
● Agitators and mixers

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