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Needle roller bearing with a thin and long rollers (roller length is 3~10 times the diameter, diameter is generally less than 5mm), radial structure is compact, its diameter size and load capacity and other types of SKF bearings are the same outside diameter minimum, particularly suitable for radial mounting dimensions limit bearing results. According to using occasions different, can selection no within ring of bearing or roll needle and keep frame component, at this time and bearing match of axis neck surface and shell hole surface directly as bearing of within, and outside scroll surface, for guarantee load capacity and running performance and has rings bearing same, axis or shell hole roll road surface of hardness, processing precision and surface quality should and bearing rings of roll road similar. Such bearings can only accommodate radial loads.
Needle roller bearing type
Except type recorded by column, available Yu general engineering of bearing, as: open type stamping outer ring needle roller bearings (1), and closed stamping outer ring needle roller bearings (2), and with within ring needle roller bearings (3) and not with within ring needle roller bearings (4) SKF also can supply various type of needle roller bearings, 1, and roll needle keep frame component 2, and no retaining side needle roller bearings 3, and since adjustable heart needle roller bearings 4, and combination roll needle/ball bearing 5, and combination roll needle/thrust ball bearing 6, and combination roll needle/cylindrical roll child thrust bearing.
STO without flanges on the outer ring, inner ring roller
RNA22... 2RS double-sided seal, bearings without inner wheel bearing
NA22... 2RS double sealed, inner wheel bearing
NATR... PP flat ring axial guide roller
NATV... PP flat ring axial guide roller, needle
NUTR rolling guide roller, full roller type
CRY inch flat ring axial guide roller
Classification of needle roller bearings
Needle roller bearings are divided into:
1. radial needle roller and cage assemblies
2.NA,NKI-needle roller bearings
3.RNA,NK-type needle roller bearing without inner ring
4.HK-drawn cup needle roller bearings
5.BK-drawn cup needle roller bearings
Mounted on the shaft end of drawn cup needle roller bearings with double side-opening (1) and single-sided closed (2). Sealed drawn cup base surface can withstand small axial guidance forces.
Drawn cup needle roller bearings
Drawn cup needle roller bearings needle roller bearing outer ring with thin metal forming. Its main feature is a low sectional height and high load capacity. Mainly used for compact, inexpensive and the housing bore cannot be used as needle roller and cage assembly roller bearings. By way of interference-fit SKF bearings with bearing box installation. Can omit case axial positioning function such as shoulder, snap ring, then the housing bore can be done very simple and economic.
Mounted on the shaft end of drawn cup needle roller bearings with double side-opening (1) and single-sided closed (2). Sealed drawn cup base surface can withstand small axial guidance forces.
Drawn cup needle roller bearings without an inner ring. At the occasion of the shaft cannot be hardened and ground, can be listed in the table on the inner ring.
Drawn cup needle roller bearing outer ring of hardened steel with needle roller and cage assemblies cannot be separated. Storage free space for lubricant can prolong relubrication intervals. Bearing generally uses a single column design. But wide except for bearings 1522,1622,2030,2538 and 3,038 series specifications, they have two needle roller and cage assemblies. Lubrication hole in the outer ring of the bearing. According to user needs, shaft diameter is greater than or equal to 7mm all single row drawn cup needle roller bearings can be equipped with lubricant holes in the outer ring (AS1 code suffix).
Sealed drawn cup needle roller bearings with oil edit this paragraph due to space limitations I cannot install the oil seal, available with open ends or a closed-end oil sealed drawn cup needle roller bearings (3-5). Friction in the bearings are equipped with polyurethane or synthetic rubber seal, filled with lithium base grease with good rust resistance, apply operating temperature-20 to + 100 ° c.
Oil seal inner than the outer ring of the bearing width 1mm, this makes the bearings in the shaft relative to the housing box small displacement can also guarantee seal good and bearings from contamination. Bearings have lubrication holes in the inner ring, depending on bearing arrangement needs, supplemented by the outer or inner ring lubrication.
Combined needle roller bearings
Is determined by the radial needle roller bearing and a thrust bearing part bearing unit, its compact size, high running accuracy, can withstand very high radial loads under the axial load. Structure and product diversity, adaptability, ease of installation.
Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery, printing machinery, and machinery and equipment, and allows very compact smart design of mechanical systems.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 30321U NTN | 105 | 225 | 49 |
| 32221U NTN | 105 | 190 | 50 |