NNU4180M Bearing Alignment In Coal Vertical Mill Roller 400X650X250 MM

NNU4180M bearing alignment in Coal Vertical Mill roller 400X650X250 MM oil lubrication

 The bearing NNU4180 M belongs to double row cylindrical roller bearing. It consist of inner /outer ring and roller with cage parts.The outer ring has the lubrication hole that can guarantee the bearing in good lubrication system.
A radial cylindrical roller bearing consists of an inner and/or outer ring and a complement of controlled-contour cylindrical rollers. Depending on the style of bearing, either the inner or the outer ring will have two roller-guiding ribs. The other ring, separable from the assembly, has one rib or none. The ring with two ribs axially locates the position of the roller assembly. The diameters of these ribs may be used to support the roller.
One of the ribs may carry light thrust loads when an opposing rib is provided in the mating ring.

Vertical roller mills (VRM) for raw, coal, slag and cement grinding for several decades. The vertical roller mill is well known in the cement and power plant industries as the preferred mill for grinding of raw materials. It is increasingly used as a solution for efficient grinding.

Within the cement industry, vertical roller mills are becoming more important as more cement producers look to increase their use of clinker substitute materials instead of importing clinker to meet localised rises in cement demand.
The VRM vertical roller mill will use the cylindrical roller bearing and spherical roller bearing.Because the roller mill will need to bear heavy load, so when the factory choose the bearing very carefully.

NNU4180M double row cylindrical roller bearing had matched the spherical roller bearing 24180ECAW33 used for cement equipment.

Single-row cylindrical roller bearings are separable bearings,the rollers are guided by the two ribs of bearing rings.The cage,rollers and guide ring are assembled to a unit, and can be separated from the other ring. These bearings are easy to be mounted and dismounted,especially inner and outer rings interference fit with shafts and housings. 

TWO-ROW BEARINGS
Two-row, or double-row, cylindrical bearings offer added radial capacity over tradition one-row types. These bearing types are interchangeable so the dimensions and diameter under the rollers
(nnu style) and diameter over the rollers (nn style) are held to an iSO/Din standard. The standard cage design is a drilled pocket,finger-style retainer.
FOUR-ROW BEARINGS
four-row cylindrical bearings have an extremely high radial load capacity, but no thrust capacity. This bearing type is mostly used in roll neck and work roll applications in the metal rolling industry.Straight and tapered bore designs are available.

This type of bearings generally carry radial loads,but bearings with ribs on inner and outer rings can carry certain axial loads.
It is not permitted that the obliquity between shafts and housings,but 2′angular misalignment between inner and outer ring axises is permitted under lower loads.If the loads were higher, the more angular misalignment will be permitted, but the upper limit is 4′.
When D≤400mm, steel pressed cages are commonly used,and steel or brass solid cages are adopted for D>400mm.

We/JinHang precision bearing orrer radial cylindrical roller bearings can offer higher radial load capacity than other bearing designs. The offers a wide range of full complement, one -, two -, and four-row designs to meet various application requirements.
cylindrical roller bearings consist of an inner and outer ring, a roller-retaining cage, and a complement of controlled- contour cylindrical rollers. Depending on the type of bearing, either the inner or the outer ring has two roller-guiding ribs. The other ring is separable from the assembly and has one rib or none. The ring with two ribs axially locates the position of the roller assembly. The ground diameters of these ribs may be used to support the roller cage. One of the ribs may be used to carry light thrust loads when an opposing rib is provided. The decision as to which ring should be double ribbed is normally determined by considering assembly and mounting procedures in the application.

 The application:
high speed tubular strander
Turbine engine mainshafts
Transmissions

cement vertical mill
large-size generators,
machine tool spindles,
axle boxes,
bent axles of diesel engines,
gearboxes
Mechanical presses
Electrical motors
Pumps and compressors
Traction motors for railway vehiches
Axle boxes for railway vehicles