The main dimensions of the tapered roller bearings comply with DIN ISO 355 and DIN 720. Dimensional and running tolerances match tolerance class PN acc. to DIN 620. These tolerance classes are standard and so are perfect for most applications.
The bearings are separable. This means the bearing parts can be fitted independently of each additional. The bearings are supplied 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 head). This microstructure helps keep an oil film that is perfect for tapered roller bearing applications. Improved oil film retention drastically inhibits surface damage, obtaining more than eight circumstances higher durability and equal or greater seizure resistance compared to conventional products.
Much better lubricant oil accumulation and retention (simpler to form oil film) in the roller surface contributes to 10% lower friction at low speeds compared to conventional products.
Tapered roller bearings may accept huge radial and axial loads. Axial loads will be absorbed in mere one direction. For axial counter support a second bearing attached inverse is required. Suitable for medium speeds.
Higher efficiency transmission systems have emerged as key to enhancing energy economy, so NSK set out to develop a substantial reliability bearing with the capacity of overcoming these hurdles.
To improve fuel economy, there has been a change to using less lubricant and/or lower viscosity lubricant in transmission systems. Because of this, tapered roller bearings in transmissions will be being subject to increasingly severe lubrication conditions, increasing the chance of lubrication essential oil film depletion (lean lubrication conditions), surface harm, and bearing seizure.