SKF Bearings

Design and assembly of NCF 0000 V cylindrical roller bearings

Single row full complement cylindrical roller bearings are designed to withstand heavy loads but have a lower limit speed. Usually standard single row full circle
There are two types of cylindrical roller bearings, NCF and NJG. The NCF type is the most common type, and the inner ring has two ribs.
The ring has a rib that can withstand the axial force in one direction, and the outer ring has a stop ring (also called a spring lock ring) to block the roller.
One-way axial positioning.

The characteristics of this type of bearing design are:
(1) Bearings have as high a stiffness and load capacity as possible. The thickness of the two ribs of the inner ring can be different, which can increase the length of the roller; the roller
The diameter matches the number, and the average circumferential clearance of the adjacent two rollers is from 0.005 to 0.01 mm, which maximizes the rated dynamic load.

(2) The roller element line contour is designed as a logarithmic curve, which can withstand large radial center load or radial eccentric load, and can weaken the roller connection.
The edge of the contact length is concentrated at the edge.
(3) Select the appropriate radial clearance according to the rotation state of the inner ring and outer ring with respect to the load direction. When the structural bearing acts as a swim
When using the end bearing, select the appropriate axial displacement according to different series.

2 bearing assembly
Single row full complement cylindrical roller bearing radial clearance, when the outer ring is subjected to rotating heavy load or general load, usually choose C3
Group; when rotated by light loads, the general group is usually used. When the structural bearing is assembled, the radial clearance method is selected and
The cage cylindrical roller bearings are the same. If the radial clearance is suitable, different assembly methods are available depending on the bearing batch.

(1) In small batches, first place the clean inner ring and outer ring end face horizontally on a clean workbench with a diameter between Dpw
The elastic band (such as rubber and rubber band) between De and De is placed on the inner ring, and a set of cleaned rollers are loaded into the inner ring raceway one by one.
Into an inner ring assembly, the elastic band is approximately in the middle of the roller. Smaller or lighter weight inner ring assembly can be manually loaded into the outer ring
Medium (the outer ring side is on the workbench side), as long as the roller is at one end

When entering the outer ring raceway, the elastic ring band can be removed; if the inner component is large or heavy, the inner ring and the outer ring must be supported by 3 support blocks.
Come, use the crane to put the outer ring into the inner assembly, pull the elastic ring belt down to the inner ring rib, wrap the inner and outer rings with wire, and then rotate
Turn 180°, so that the end face of the outer ring closer to the stop groove faces upward, and insert the stop ring into the outer ring stop ring groove to complete the joint