Cylindrical Roller Bearings

Cylindrical roller bearings are a bearing with an inner and outer ring and a cylinder. The cylinder is used to reduce frictional forces. It is usually supported by a rib and attached to the inner or outer ring or cage. The cylinder size can be increased or decreased to optimize performance.

Single-row

Single-row cylindrical roller bearings have a high radial load capacity and low friction. They are used in motors, industrial machinery, and machine tools. These bearings are often measured in metric units for industry consistency. The main advantage of these bearings is that they can handle high radial loads and very little friction.

Single-row cylindrical roller bearings are available in various sizes. Some models feature a full complement of rollers. They feature a pressed steel or machined brass cage, while others have moulded polyamide cages. Depending on the application, they can also be manufactured without cages. This allows for higher load capacities but can reduce speed.

With or without cages

There are several factors to consider when deciding whether to use cylindrical roller bearings with or without cages. First, the speed of rotation is an important factor. Some bearings are designed for high rotation speeds, while others can only be used for lower speeds. Another consideration is the possibility of misalignment. Double-row ball bearings, for example, are not suited for misalignment.

The cage's design should allow maximum force to eject the mold insert. The maximum force must be sufficient to pull the mold insert from the bearing without damaging the cage. This is critical because the cage's manufacturing tolerances can't be too wide or will not function properly.

With or without ribs

Cylindrical roller bearings have parallel rollers guided by ribs. These bearings are often used in free-end applications as they can accommodate high axial displacements without causing excessive friction. On the other hand, the "ribless" ring is usually press-fit into the housing. Cylindrical roller bearings are generally better suited for high-speed rotation because they have low friction and high stiffness. They also have lower overall friction and are generally more suitable for higher loads than ball bearings. Cylindrical roller bearings are also typically available in single and double-row designs.

Single-row cylindrical roller bearings are divided into two types, N and NU. The former features two integral ribs on the inner ring, while the latter features only a single rib on the outer ring. Both types have a similar overall design, but an NJ type supports heavier radial loads than an NF type. The former can also support incidental thrust loads.

With or without lubrication holes

Cylindrical roller bearings feature a ring-shaped groove and can have either three or six lubrication holes in the outer ring. They are suitable for applications involving heavy radial and impact loads. Besides, their structure makes them easy to mount and machine.

Cylindrical roller bearings are used in various applications, including power transmission, mining, and cement processing. Some are also used in briquetting machines, rubber mixing equipment, and rolling mills. Other uses include electric motors, blowers, plastics machinery, and traction motors.