For power sources to produce useful work, their energy necessarily must be transmitted to a working implement of some sort. A transforming of rotational forces produced by a motor or engine, through modifying the speed, torque or rotational direction can produce an optimum force required for the work. Eventually all these mechanical devices will require Gearbox repairs.
This part, sometimes called a reducer, is used wherever a machine is required to run at a different output speed than the drive or engine speed. Differences in gear ratios result in changed speed and torque.
By meshing the rotating drive or input gear with an output gear that is of larger size and having more teeth, rotational speed is slowed. Torque is also increased, producing a mechanical advantage. The automobile is one application where this can be seen. Its engine, to run smoothly, must produce many times the rotation per minute than can be used where the wheel meets the road.
In some applications, such as large wind turbines, that is reversed. Due to requirements of design, the blades of the turbine must turn at a slower speed while electrical generators must have several thousands of revolutions per minute to do their work. Here the gearbox increases the speed.
The transmission device can be quite complex, with multiple choices of output speeds supplied by gears of several different sizes. An automobile transmission is an example of this. When the car is first put into motion the engine’s rotational power must be slowed considerably and the torque or mechanical advantage increased, so that inertia may be overcome. A larger output gear will accomplish this.
As the vehicle begins to travel at more speed and momentum increases, less torque is needed and more speed desired. Using successively smaller output gears results in faster rotation of the wheels. For high cruising speeds an overdrive gear may be available.
When steep hills are encountered the increase in gravitational force that needs to be overcome slows the vehicle. Now it becomes necessary to gear down once again to produce the torque required to carry the car over the hill. Trucks carrying heavy loads or towing have the same demands. When these same trucks are also climbing hills they have need of gearing with much different ratios than economy, or cruising vehicles.
Some applications demand a change of rotational direction or angle. One example of this is the rotor of a helicopter. A vertical shaft transfers rotational energy from the engine but must drive the rotor, which turns at a right angle to the shaft.
These reducers and their component parts can over time wear or fail. In those instances Gearbox repairs will become necessary. Skilled mechanics will be able to inspect and analyze the device to determine the cause of failure. They can then repair or refurbish damaged parts or replace them, even fabricating new ones if desired. The finished work should work just the same as a device in new condition, if not better, with adjustments to improved performance or extend working life.
Get the low down on the different types of gear reducers and gearbox repairs now in our guide to all you need to know about common gearbox problems