The main dimensions of the tapered roller bearings conform to DIN ISO 355 and DIN 720. Dimensional and running tolerances match tolerance school PN acc. to DIN 620. These tolerance classes are standard and are perfect for most applications.
The bearings are separable. This implies the bearing parts could be fitted independently of each various other. The bearings are provided without seals. They are often lubricated with grease or oil from the side.
The rollers are processed to create pore-like micro indents in the surface of the steel (rolling contact surface and roller brain). This microstructure helps retain an oil film that is well suited for tapered roller bearing applications. Improved oil film retention drastically inhibits surface damage, achieving more than eight times higher durability and equal or greater seizure resistance in comparison to conventional products.
Much better lubricant oil accumulation and retention (simpler to form oil film) in the roller surface contributes to 10% lower friction for low speeds in comparison to conventional products.
Tapered roller bearings may accept high radial and axial loads. Axial loads are absorbed in mere one way. For axial counter support another bearing installed inverse is required. Suitable for medium speeds.
Bigger efficiency transmission systems are seen as key to enhancing gas economy, so NSK attempt to develop a high reliability bearing with the capacity of overcoming these hurdles.
To improve fuel economy, there has been a shift to using less lubricant and/or lower viscosity lubricant in transmission systems. Because of this, tapered roller bearings in transmissions are being at the mercy of increasingly severe lubrication conditions, increasing the chance of lubrication essential oil film depletion (lean lubrication circumstances), surface destruction, and bearing seizure.