Intermediate gearbox (IGB)

SKF products & typical solutions

Application description
The intermediate gearbox transmits torque and changes the angle of drive from the main transmission gearbox to the tail gearbox.

SKF products and typical solutions

The intermediate gearbox

The intermediate gearbox transmits torque and changes the angle of drive from the main transmission gearbox to the tail gearbox. In the intermediate gearbox typically each shaft is supported by two cylindrical roller bearings and a locating angular contact ball bearing. Other configurations are possible however, such as shaft systems supported by tapered roller bearings. Preload is required to provide a precise gear mesh and system stiffness.

Tapered roller bearings have tapered inner and outer ring raceways and tapered rollers. They are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads. The projection lines of the raceways meet at a common point on the bearing axis to provide true rolling and low friction. The axial load-carrying capacity of tapered roller bearings increases with increasing contact angle.

A single row tapered roller bearing is typically adjusted against a second tapered roller bearing. Single row tapered roller bearings are separable, i.e. the inner ring with roller and cage assembly (cone) can be mounted separately from the outer ring (cup). The factors that influence SKF bearing performance and service life include, but are not limited to, the following:
  1. Roller end / flange contact area.
  2. The geometry and surface finish of the roller ends and the area on the flange that makes contact with the roller ends, have been optimized to promote and maintain the formation of a lubricant film. This reduces friction and frictional heat as well as flange wear. The bearings can better maintain preload and run at reduced noise
    levels.
  3. Raceway profiles.
  4. To extend service life under misalignment or heavy load conditions, SKF tapered roller bearings have either crowned raceways or a specific roller profile to prevent stress peaks at the roller ends. The profile is designed to optimize load distribution along the length of the rollers.
  5. Consistency of profiles and roller size.
  6. The rollers used in SKF tapered roller bearings are made to very close tolerances. These extremely close tolerances, together with the precision of the raceway profiles, provide optimal load distribution over the rollers, to reduce noise and vibration levels and enable preload to be set more accurately.
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