年表作成・共有サービス - pastport

https://www.zwabearings.com/products/double-row-cylindrical-roller-bearing.html

Bearing Double Row
The rollers of two-row cylindrical roller bearings are crossing arranged. While rotating, the wave ratio is one time higher than single-row cylindrical roller bearings. However, the vibration ratio decreases 70%. And due to its two-row roller arrangement, compared with single-row cylindrical roller bearings, they are able to bear extremely higher load capacity.

Based on the different bore types, ZWA’s double-row cylindrical roller bearings are divided into two types, one is with cylindrical bore and the other is with a tapered bore. Based on a different arrangement of flanges on the inner ring and outer ring, and also the cage design, ZWA’s double-row cylindrical roller bearings are divided into NNU, NN, and NNUP types. For NNU type, there are ribs on both sides of the outer ring but no ribs on the inner ring. For NN type, there are ribs on both sides of the inner ring but no ribs on the outer ring. For NNUP type, there ribs on both sides of the outer ring, and ribs on one inner ring. While mounting the NNUP types, do make the marked ribs outward. In general, NU and NN type are used on the free end and NUP types on fixed end.

ZWA offers double row roller bearing both with machined brass and steel cages. With continuous efforts in improving on the quality, ZWA has helped the customers realized the following goals by providing two-row cylindrical roller bearings:

Reduce the cost

Increase productivity

Prolong the equipment service life

Improve the sustainability

The features of two-row cylindrical roller bearings are as follows

Compact internal structure

Higher stiffness

Higher load capacity ability

Small deformation after high load

Lower friction

Longer service life

Improve the operational reliability

Separable and interchangeable

High-speed ability

Application of two-row cylindrical roller bearings are as follows:

The spindle of tooling machine, rolling mills, gearboxes, grinding machines and so on.

ZWA Bearing Recommendations
Full Complement Cylindrical Roller Bearings
Full complement cylindrical roller bearing is a kind of cylindrical roller bearing designed without cages. In this design, the number of rollers are the biggest in all the bearings types.

Four Row Cylindrical Roller Bearing
Four-row cylindrical roller bearings are kind of separable bearings. The rings and roller components are easily separable.

Single Row Cylindrical Roller Bearing
Single row cylindrical roller bearings with cages are part of radial roller bearings. Compared with the ball bearings’ balls, the rollers have a bigger contact to the roller axle.

If you want to know more about double row bearing size chart, please visit our website.

As a bearing company, we will do our best to meet all the needs of customers.