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  • Writer's pictureSyed Sagheer Abbas Rizvi

Reduction Gearbox: Types, Functions, and Applications

A reduction gearbox is a mechanical tool used to lower an engine's output speed. The output torque of the shaft is increased by decreasing output speed. The reducer changes the rotation of the drive motor's output shaft to the speed necessary to propel the propeller.

This apparatus is also known as a torque multiplier, reduction drive, or speed reducer. It links the drive load and the drive motor. Between the engine and the machine, reducers have a straightforward design similar to a gear train.

To increase the torque per shaft rotation in different

of motors, reducers are frequently employed. A typical example of a deceleration drive is the gearbox of every automobile.

The output-to-input gear ratio reduces shaft speed, boosts transmission torque, and slows the motion of the output shaft.

Despite their complexity, some reducer types function as gear trains between separate parts, with the input section having fewer teeth than the output section, which enables slow motion. This causes the output gear to slow down and increases torque. lower RPM. These gears can also be used to track torque, output RPMs, and input speeds.

Types of Reduction Gearbox

There are typically two types of reduction gearboxes in use.

Single Reduction Gearbox

In this configuration, there is just one set of gears. Through ports in the reduction gearbox, the engine shaft and propeller shaft are inserted into the device. The entering engine shaft performs a little gear known as a pinion.

A fantastic gear that is directly attached to the propeller shaft is run by the pinion. By establishing a proportionate relationship between the speed adjustment and the diameter of the gear and pinion, the speed may be controlled. A single-gear configuration often has a gear that is twice as big as the pinion.

Double Reduction Gearbox

Double-reduction gearboxes are frequently employed when very high speeds are involved. In this installation, a flexible coupling is used to mount the pinion to the input shaft. The first reduction gear is connected to an intermediate segment by the pinion.

The second shaft is used to connect the first reduction gear to the low-speed pinion. The second reduction section that is directly attached to the propeller shaft is where this pinion is installed. Such an arrangement makes it possible to reduce speed by a factor of up to 20:1.

What Is the Use of a Reduction Gearbox?

We will use the example of a ship using high-speed turbines to illustrate why a reduction gearbox is used in a certain system. Even if the successful operation of a propeller necessitates a fairly low rpm state, the main need of a ship is that the steam turbine must operate at a suitably large range of rpm to have appropriate efficiency.

Due to this, a reduction gearbox is used to lower the steam turbine's high-speed revolution to the low rpm level required by the propeller.

Uses and Applications

The reducer adjusts the main engine's output shaft rotation to the speed needed to propel the propeller. To transfer motion from the driveshaft to the driven shaft and slow it down, some teeth operate with the pinion and wheel.

I have outlined several industries where reduction gearboxes are utilized.

· Power generation

· Railroad vehicle

· cement

· Mining

· Oil and gas

· Wind and tidal power

· Hydropower

· Turbo


What kind of reduction gearbox is best for your application is the last question you should be asking yourself. Your reducer's input and output shafts can have parallel shafts, coaxial shafts, or orthogonal shafts. Depends on the intended usage.

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