Cylindrical Roller Bearings (CRB) are designed to carry heavy radial loads at moderate speeds. They are found in applications from gearboxes and pumps to material handling applications and machine tooling.
Types of Cylindrical Roller Bearings
- Single Row
- Double Row
- Multi Row
Cylindrical Roller Bearing Design
The rolling elements in CRBs consist of cylinders as opposed to balls. These cylinders are slightly greater in length than diameter and are heat treated for maximum life. The rollers have a greater contact area with the inner and outer ring raceway, allowing the load to be distributed across a wider surface. This design provides suitability for high radial load capacity. They can be manufactured with a cage or as a full complement bearing.
The inner and outer ring are separable, which makes single row CRBs easy to mount and dismount. Double and multi-row cylindrical roller bearings have even greater radial load capacity and can transmit axial loads in a single direction.
Seals vs Open
Cylindrical roller bearings are available in both as split and sealed. A seal protects the rollers from contaminants while retaining lubrication, which leads to a longer service life. A split bearing works well for applications that are difficult to access, such as electric motors.
Frequently Asked Questions about Cylindrical Roller Bearings
Are cylindrical roller bearings known as having low friction?
Yes. The roller design and surface finishes allow the bearing to manage the load with low levels of friction.
What causes cylindrical roller bearings to fail?
They can fail due to improper mounting, lubrication and containments. Excessive loads can lead to overheating. A majority of failures are due to the application and lubrication, which is why design and selection are very important.
What maintenance procedures should be followed?
Like all bearings, cylindrical roller bearings are subjected to rust, pitting, scratches and chips. Having the bearing treated with a surface coating can help to extend the life of the bearing by preventing these instances.
What kind of surface treatments should be used on a cylindrical roller bearing?
Zinc nickel plating, zinc and phosphate coatings help to prevent rust.
What is the difference between a needle and cylindrical roller?
A needle bearing usually has a length/diameter ration of over four. The rollers in a cylindrical roller are shorter in length with a larger diameter.