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What is a gearbox, and what does it do?

Release date:

2022-06-16

A gearbox is a mechanical device that increases or decreases torque by reducing or increasing speed. It consists of two or more gears, one of which is driven by a motor. The output speed of the gearbox is inversely proportional to the gear ratio. Gearboxes are typically preferred for constant-speed applications, such as conveyors and cranes, where they can deliver significantly higher torque.

Gears are used to transfer power from one part of a machine to another. For example, in a bicycle, power is transmitted from the pedals to the rear wheel. Similarly, in a car, gears move power from the crankshaft (the engine's rotating shaft) to the transmission shaft running beneath the vehicle, ultimately delivering motion to the wheels. We can connect any number of gears together, varying their shapes and sizes—this setup is known as Gearbox 。


Changing the direction: When two gears are meshed together, they always rotate in opposite directions. So if one gear turns clockwise, the other must turn counterclockwise. We can also use specially shaped gears to redirect a machine’s force at an angle. For instance, in cars, the differential—located between the rear wheels’ axles in rear-wheel-drive vehicles—employs bevel gears to twist the power from the drive shaft by 90 degrees, ultimately turning the rear wheels.


Gearbox It is a mechanical device that increases or decreases torque by slowing down or enlarging. Gearbox Consisting of two or more gears, one of which is driven by a motor, the output speed of the gearbox is inversely proportional to the gear ratio. Gearbox Typically preferred for constant-speed applications, such as conveyors and cranes, it can deliver greater torque.


Gearbox It includes a drive gear of a certain diameter, as well as another smaller gear connected to the driving mechanism (such as an electric motor, wind turbine, diesel engine, etc.). (If the driven mechanism operates at a higher speed than the driving mechanism,) it features a diameter connected to the driven mechanical load; (if the driven mechanism needs to operate at a lower speed than the driving mechanism,) it incorporates a mechanism that either increases or decreases speed/torque—and vice versa—serving as a mechanical accessory for the motor.


Switch the motor from high speed and low torque to low speed and high torque—no idling even during Christmas!


Low speed/high torque to high speed/low torque.


Sometimes, the "gear head" operates with a synchronous belt or chain at a 1:1 gear ratio to minimize the transmission of motor vibrations to the load.


A frequently overlooked scenario—gear reducers lower the inertia of the motor, calculated based on the square of the motor’s gear ratio. For example, if we install a 4:1 gear drive, an input speed of 2000 RPM will be reduced to 500 RPM, but the load inertia will actually decrease by a factor of 16.


If a worm gear is used, the system automatically locks the mechanism (preventing us from moving the load until the motor rotates).


There are also some with their own unique features—such as ball screws with gear heads, though we typically don’t refer to them as "gear heads." And note that gears cannot spin freely on their own, which means our output power will be reduced, indicating that gears inherently come with a certain level of efficiency. There are various types of gear heads: spur, planetary, helical, multi-stage, harmonic, worm, (cycloidal), and worm-gear systems—and even combinations of these—but all of this constitutes a comprehensive, self-contained science in its own right.


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