RKB Bearing Products

Gearboxes and Roller bearings

Do Gearboxes and Roller bearings marry together forever?

Gears were a logical continuation of the invention of the wheel. That gears are called the most significant device after the wheel is not unthinkable, In any case, we can’t live a typical day in our lives without gears. Until now, the Greeks were given the honor of the invention of the wheel, estimated that they have first used 300 years BC in Alexandria for the first time. But were the ancient Greeks the inventors? Research biologists at the University of Cambridge are sure that the ancient Greeks were not the first. The three millimeters small bug Issus coleoptratus uses this mechanism already for millions of years. The gear is not a human invention of the ancient Greeks, but a device that arose through evolution in nature. Now we are using the gearbox as an essential part of our life every day. In a simple word, the gearbox is a fully integrated mechanical component consisting of a series of mating gears contained in a housing with shafts and roller bearings used to torque decrease or increase.

Rolling bearings play vital roles in supporting the shafts and gears of industrial gearboxes, and, often, several different bearing types will function in one gearbox. Even when these precision components are correctly designed, manufactured, and specified, however, effectiveness and service life is a threat at every turn. Selecting the proper roller bearing arrangement for a gearbox application is the first critical step toward successful performance. However, the demands on bearings in service potentially can lead to damage linked most often to fatigue, wear, and fractures. There are many different bearings available, each having a unique set of load-carrying characteristics. Roller Bearing loads can be pure radial, pure axial, or a combination of the two. The most common roller bearings used in gearboxes are:

  • Angular Contact Ball Bearings: Integrated raceways arranged at an angle to the roller bearing axis, enabling them to carry heavier axial loads.
  • Tapered Roller Bearing: Integrate tapered raceways to handle combined radial and axial loads and can be specified with contact angles to accommodate specific load combinations. Because these roller bearings can support heavy loads, they will usually be the first choice for the Gearbox manufacturer.
  • Cylindrical Roller Bearing: Exhibit high radial load-carrying capacity, the lowest friction of any roller bearing under purely radial load, and the capability to run at high speeds.
  • Spherical Roller Bearing: offer a self-aligning capability to compensate for shaft bending or where there may be errors in alignment between shaft and housing
  • Thrust Bearing: Engineers interested in thrust bearings for gearboxes where axial forces are produced by the driven machine (such as in extruder gearing and water-turbine gearboxes).

The premium roller bearing manufacturers like RKB are using advanced software and technology to simulate how roller bearings carry the loads.  At the same time, it is essential to know how different types of loads distribute on the rolling elements. Choosing the right supplier of rolling bearings is as vital as selecting the correct roller bearings.  Although gears and roller bearings look like simple ancient parts, their destiny inside the gearbox is tighten together forever.

Writen by Ali Ghamsari