Needle bearing characteristics and uses
With thin and long needle bearing roller (roller length of 3 to 10 times the diameter, the diameter of generally not more than 5mm), and therefore radial structure is compact, its diameter size and load capacity and other types of bearings, outer The minimum diameter, especially for radial bearing mounting dimensions restricted results. Depending on different occasions, it can be used without an inner ring of the bearing or needle roller and cage assembly, when the surface of the journal bearing surface and shell holes to match the inner bearing directly as outer rolling surface, in order to ensure load capacity and operating performance and have the same bearing rings, shaft or housing bore raceway surface hardness, machining accuracy and surface quality should be similar roller bearing rings. Such bearings can only bear radial load.
Needle roller bearing type
In addition to catalogs listed, can be used for general engineering bearings, such as: open Needle roller bearings (1), closed Needle roller bearings (2), needle bearing inner ring (3) and does not have needle bearing inner ring (4) SKF can also supply all types of needle roller bearings, 1, needle roller cage assembly 2, needle roller bearings without ribs 3, 4 self-aligning roller bearings, combined needle roller / ball bearing 5, combined needle roller / axial ball bearings 6, combined needle roller / cylindrical roller thrust bearings.
STO outer ring without ribs, roller bearing inner ring
RNA22 ... 2RS double sealed, no inner roller bearing
NA22 ... 2RS double sealed, roller bearing inner ring
NATR
NATR ... PP flat ring axial guide roller bearing
NATV
NATV ... PP flat ring axial guide roller bearing, full needle
NUTR guide roller bearing rolling elements, full roller type
CRY inch flat ring axial guide roller bearing
Needle Roller Bearings Classification
Needle roller bearings are divided into:
1. Radial needle roller and cage assembly
2.NA, NKI-type needle roller bearings
3.RNA, NK-type needle roller bearings without inner ring
4.HK drawn cup needle roller bearings
5.BK drawn cup needle roller bearings
Mounted on the shaft end Needle roller bearings have a bilateral open (1) and unilateral closed (2). Drawn cup base closed end surface can withstand small axial guiding force.
Needle roller bearings
Needle roller bearings with a thin needle roller bearings stamping outer ring. Its main feature is the low sectional height and bear higher load capacity. Mainly used for compact, inexpensive and not as a needle bearing inside the hole cage assembly raceway bearing configuration. Bearings and bearing housings shall install an interference fit. If it can save me axial positioning shoulder, retaining ring, and other functions, then the bearings inside the hole can be made very simple and economical.
Mounted on the shaft end Needle roller bearings have a bilateral open (1) and unilateral closed (2). Drawn cup base closed end surface can withstand small axial guiding force.
Needle roller bearings are generally not attached to the inner ring. In the journal can not be hardened and ground situation, you can use the table listed in the inner ring.
Needle roller bearings hardened steel outer ring and needle roller cage assemblies can not be separated. Lubricant storage free space can be extended to add lubrication interval. Bearings generally use single design. Except wide specification bearings 1522,1622,2030,2538 and 3038 series, which is equipped with two needle roller cage assemblies. Bearing outer ring with lubrication holes. According to user needs, the shaft diameter greater than or equal to all single 7mm Needle roller bearings can be equipped with lubrication holes in the outer ring (code suffix AS1).
Needle roller bearings with seals Edit this paragraph can not be installed due to space constraints in the seal of the occasion, it can provide an open-ended or closed end Needle roller bearings with seals (3-5). Such equipment bearing polyurethane or synthetic rubber friction seal, wherein the lithium base grease filling good antirust properties, suitable operating temperature -20 to + 100 ℃.
A seal bearing inner ring is wider than the outer ring 1mm, this is the bearing in the machine axis relative to the displacement of the bearing box with a little work but also to ensure good seal and prevent injury bearing contamination. Bearing inner ring lubrication holes are also, according to the needs of the bearing arrangement, the outer or inner supplementary lubrication. Combined needle roller bearings
Combined needle roller bearings
By the bearing unit to the heart needle roller bearings and thrust bearing components portfolio, its compact structure, small size, high precision rotation, can withstand high radial load at the same time bear certain axial load. And product structure forms, wide adaptability, easy to install.
Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other machinery and equipment, and mechanical system design allows very compact and nimble.

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