Tapered Roller Bearing

The main sizes of the tapered roller bearings conform to DIN ISO 355 and DIN 720. Dimensional and running tolerances correspond to tolerance school PN acc. to DIN 620. These tolerance classes are standard and are well suited for most applications.

The bearings are separable. This implies the bearing parts can be fitted independently of each other. The bearings are provided without seals. They could be lubricated with grease or essential oil from the side.

The rollers are processed to create pore-like micro indents in the surface of the steel (rolling contact surface area and roller mind). This microstructure helps preserve an oil film that’s well suited for tapered roller bearing applications. Improved essential oil film retention significantly inhibits surface damage, obtaining more than eight times higher toughness and equal or increased seizure resistance compared to conventional products.
Superior lubricant oil accumulation and retention (easier to form oil film) in the roller surface plays a part in 10% lower friction for low speeds in comparison to conventional products.
Tapered roller bearings may accept great radial and axial loads. Axial loads will be absorbed in only one way. For axial counter support a second bearing installed inverse is required. Suitable for medium speeds.

Bigger efficiency transmission systems have emerged as key to enhancing gasoline economy, so NSK set out to develop a large reliability bearing capable of overcoming these hurdles.

To boost fuel economy, there has been a change to using less lubricant and/or lessen viscosity lubricant in tranny systems. As a result, tapered roller bearings in transmissions will be being subject to increasingly severe lubrication conditions, increasing the chance of lubrication oil film depletion (lean lubrication conditions), surface damage, and bearing seizure.