SKF double row cylindrical roller bearing http://www.alierbearings.com/index.php?c=product&a=search&word=SKF+NNU has a cylindrical inner hole and a conical inner hole (after bearing code plus K).

This kind of bearing has the advantages of compact structure, large rigidity, large bearing capacity and small deformation after load. It is especially suitable for spindle bearing of machine tool.

The conical inner hole can also play a role in adjusting the clearance, and it can simplify the structure of the positioning device and facilitate the installation and disassembly.

The common double-row cylindrical roller bearings have the following forms:

NN, NNU type

The outer ring of NN type bearing has no edge, and the inner ring has middle side.

The axial displacement of the axial bearing can be allowed in two directions.

The outer ring of NNU type bearings has a middle baffle in the middle of the outer rim of the bearing.

The axial displacement of the axial bearing can be allowed in two directions.

Therefore, such structures are suitable for moving end bearings.

The type bearings are kept by the vehicle body.

NNF type

The NNF type bearing is a double row full cylindrical roller bearing, bearing with a middle baffle outer ring, two double - edge inner ring structure.

The roller is guided by the inner ring, and two inner rings are fastened together with a fastening ring.

In addition to withstanding large radial load and axial load, the structure can also withstand overturning moment, so it is commonly used for fixed end bearing.

Contact seal is used on both sides of NNF type bearing.

Bearing inner filled with grease, the working temperature of the grease for - 50 ℃ to + 110 ℃, but due to the limitation of sealing material, the working temperature of bearing is limited to - 40 ℃ to + 80 ℃.

In good working condition, with sealed NNF bearing the need for maintenance, if the bearing water or pollute the environment for a long time, and for the medium and high speed, through oil groove and oil hole on the outer ring of bearing lubrication to supplement