Double Row Cylindrical Roller Bearings
Features
Double row cylindrical roller bearings:
NN type: the inner ring has ribs, and the outer ring has no ribs. The outer ring and the inner assembly can be installed separately, which does not limit the axial displacement of the shaft or the housing, and cannot bear the axial load. Compared with a single row cylindrical roller bearing of the same radial size, it can withstand larger radial loads. The structure is compact, the deformation under load is small, and it is especially suitable for the support of the spindle of the machine tool.
Type NN…K:
The structure is the same as the NN type, but the inner hole of the bearing is tapered, which is convenient for fine-tuning the radial clearance of the bearing and convenient for assembly and disassembly. This type of bearing is mostly used in the main shaft of the machine tool and is installed on the tapered shaft. The radial clearance is adjusted by the pressing amount of the inner ring.
Types NNU, NNU…K:
The outer ring has ribs and the inner ring has no ribs. There are two kinds of cylindrical holes and conical holes. It does not limit the axial displacement of the shaft or housing and cannot bear axial loads. Compared with a single row cylindrical roller bearing of the same radial size, it can withstand larger radial loads.
Type NNCF:
The inner ring has three ribs and the outer ring has one rib for axial positioning in one direction. The outer ring is fitted with a retaining ring on the other side of the rib to keep the bearing in one piece.
NNCL type:
The inner ring has three ribs, the outer ring has no ribs, and there are stop rings on both sides to become an inseparable bearing.
NNCS:
The inner ring has three ribs, the outer ring has no ribs, and there is an intermediate locking ring in the middle of the outer ring, which becomes an inseparable bearing. The shaft and the bearing seat allow a certain axial displacement and can be used as a free end bearing.
Applications
Such bearings are mainly used in machine tool spindles, internal combustion engines, gas turbines, reducers, loading and unloading machinery and various industrial machinery.
Size range:
Double row cylindrical roller bearings:
Inner diameter size range: 50mm~1500mm
Outer diameter size range: 80mm~2300mm
Width size range: 23mm~800mm
Tolerance: The product accuracy has ordinary grade, P6 grade, P5 grade, and P4 grade products can also be processed if the user has special requirements.
Radial clearance
The standard product of double row cylindrical roller bearing has 1 set of clearance, and cylindrical bore bearings can also provide 2 or 3 sets of clearance.
Tapered bore bearings are also available with 2 sets of clearance.
Bearings with radial clearance larger or smaller than the standard value can also be produced according to user requirements.
cage
Double row cylindrical roller bearings mostly use machined brass cages, and sometimes nylon cages are also available.
Supplementary code:
D split bearing.
DR two-row split bearing paired use
E Internal design changes, reinforced structure. (The size of the raceway conforms to the current national standard (enhanced type), the diameter of the roller,
The length is increased compared to the non-reinforced type. )
FC...ZW four-row cylindrical roller bearing, single inner ring, double outer ring with double ribs, two rows of rollers are close together.
J steel plate stamping cage, additional numerical difference when the material is changed.
JA Steel sheet stamping cage, outer ring guide.
JE phosphated unhardened steel stamping cage.
K taper bore bearing, taper 1:12.
K30 tapered bore bearing, taper 1:30.
MA brass solid cage, outer ring guide.
MB Brass solid cage, inner ring guided.
There are snap grooves on the outer ring of the N bearing.
NB Narrow inner ring bearings.
NB1 narrow inner ring bearing, one side narrow.
NC narrow outer ring bearing.
NR bearings have snap grooves and snap rings on the outer ring.
The N1 bearing outer ring has a locating notch.
The N2 bearing outer ring has two or more symmetrical positioning notches.
Q Bronze solid cage with additional numbers for different materials.
/QR Combination of four cylindrical roller bearings, the radial load is evenly distributed
The outer ring of the R bearing has a stop rib (flange outer ring).
-RS bearing with skeleton rubber seal on one side
2RS Bearings with RS seals on both sides.
-RSZ bearing has a skeleton rubber seal (contact type) on one side and a dust cover on the other side.
-RZ bearing has a skeleton rubber seal on one side (non-contact type).
-2RZ Bearings with RZ seals on both sides.
VB Shaker Bearings.
WB wide inner ring bearing (double-sided wide).
WB1 wide inner ring bearing (single side width).
WC wide outer ring bearing.
X flat retaining ring roller full complement cylindrical roller bearing.
X1 outer diameter is non-standard.
X2 width (height) is non-standard.
X3 outer diameter, width (height) non-standard (standard inner diameter).
-Z bearing has a dust cover on one side.
-2Z bearing with dust cover on both sides
