Needle bearing is a roller bearing with cylindrical rollers. Compared with its diameter, the rollers are thin and long. This kind of roller is called needle roller. Although it has a small section, the bearing still has high load bearing capacity. The needle roller bearing is equipped with thin and long rollers (roller diameter D ≤ 5mm, L / D ≥ 2.5, l is the roller length). Therefore, the radial structure is compact. When its inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest, which is especially suitable for the supporting structure with limited radial installation size.
According to different application occasions, the bearing without inner ring or needle roller and cage assembly can be selected. At this time, the journal surface and shell hole surface matched with the bearing are directly used as the inner and outer rolling surfaces of the bearing. In order to ensure that the load capacity and operating performance are the same as those of the bearing with ferrule, the hardness, machining accuracy and surface quality of the raceway surface of the shaft or outer shell hole should be similar to that of the bearing ferrule. This kind of bearing can only bear radial load.
type
In addition to the bearings listed in the catalogue, which can be used in general engineering, such as: open stamping outer ring needle roller bearing (1), closed stamping outer ring needle roller bearing (2), needle roller bearing with inner ring (3) and needle roller bearing without inner ring / needle roller bearing without cage (4), needle roller bearing with cage and full needle roller bearing without cage (5) jXN can also supply various types of needle roller bearings, 1. Needle cage assembly 2 Needle roller bearing without rib 3. Self aligning 4. Combined needle roller / ball bearing 5. Combined needle roller / thrust ball bearing 6. Combined needle roller / cylindrical roller thrust bearing
Sto outer ring has no retaining edge and inner ring supporting roller
RNA22... 2RS double-sided seal, no inner ring support roller
NA22... 2RS double-sided seal with inner ring support roller
NAT
NATR... PP flat retaining ring axial guide supporting roller
NATV
NATV... PP flat retaining ring axial guide supporting roller, full needle type
Nutr rolling element guide support roller, full roller type
Cry imperial flat retaining ring axial guide support roller
Drawn Cup
The pressed outer ring needle roller bearing is a needle roller bearing with a thin pressed outer ring. Its main feature is that the section height is very low and the load bearing capacity is high. It is mainly used for bearing configuration with compact structure and low price, and the hole in the bearing box can not be used as the raceway of needle cage assembly. The bearing and bearing housing must be installed in an interference fit manner. If the axial positioning functions such as box shoulder and stop ring can be omitted, the bore in the bearing box can be made very simple and economical.
The punched outer ring needle roller bearing installed on the shaft end has two sides open type and one side closed type. The base end face of the closed stamping outer ring can bear little axial guiding force.
The outer ring of the roller bearing is not normally stamped. When the journal cannot be hardened and ground, the inner ring listed in the table can be used.
The hardened steel plate outer ring of the punched needle roller bearing cannot be separated from the needle roller cage assembly. The free space for storing lubricant can extend the interval of supplementary lubrication. Bearings are generally designed in a single row. Except for the wider bearing series 152216222032538 and 3038, which are equipped with two needle roller cage components. There are lubricating oil holes in the outer ring of the bearing. According to the needs of users, all single row stamped outer ring needle roller bearings with shaft diameter greater than or equal to 7mm can be equipped with outer ring with lubricating oil hole (code suffix AS1).
Needle roller bearing with pressed outer ring with oil seal
When the oil seal cannot be installed due to space constraints, needle roller bearings (3 to 5) with oil seal stamped outer ring at open end or closed end can be provided. This kind of bearing is equipped with polyurethane or synthetic rubber friction oil seal, which is filled with lithium grease with good anti rust performance, and the applicable operating temperature is - 20 to + 100 ℃.
The inner ring of the bearing with oil seal is 1mm wider than the outer ring, which enables the bearing to work well without causing pollution to the shaft when there is a slight displacement between the shaft and the bearing box. The bearing inner ring also has lubrication holes, which can be supplemented by the outer ring or inner ring according to the needs of bearing configuration.
classification
1. Centripetal needle roller and cage assembly
2. Na, NKI needle roller bearing
3. RNA, NK type needle roller bearing without inner ring
4. HK type stamped outer ring needle roller bearing
5. BK type pressed outer ring needle roller bearing
English model
Metric series: HK, BK, F, FH, FY, MF, MFH, mfy; TA.. Z、TLA.. Z
、TAM、TLAM、YT、YTL。British series: SCE, BCE, sch, BCH, Sn, B, BH, m, MH, etc; BA... Z
RS ----- one sealing ring is equipped with metric system
2RS -- two sealing rings, with metric system
P ------- it is a sealing ring, equipped with British system
PP ------ two sealing rings, equipped with British system
ASI / Oh --- refers to oil holes HK, Ba, Ta Z -- perforated punched outer ring needle roller bearing BK, Tam, tlam -- sealed punched outer ring needle roller bearing
F -- full mounted needle roller bearing with punched outer ring
FY, YT -- full loaded needle roller bearing with punched outer ring (grease limit)
FH, YTL -- full loaded needle roller bearing with punched outer ring (heavy series)
MF -- sealed stamped outer ring full loaded needle roller bearing
MFH -- sealed stamped outer ring full loaded needle roller bearing
SCE -- punched outer ring needle roller bearing
BCE -- sealed stamped outer ring needle roller bearing
Sch -- punched outer ring needle roller bearing
BCH -- sealing type punching outer ring needle roller bearing
Sn -- full loaded needle roller bearing with punched outer ring
B -- full mounted needle roller bearing with punched outer ring
BH -- full loaded needle roller bearing with punched outer ring (heavy series)
M -- sealed stamped outer ring full loaded needle roller bearing
MH -- sealed stamped outer ring full loaded needle roller bearing (heavy series)
Solid ferrule
Solid ring needle roller bearing is composed of one or two rings and needle roller group with cage. According to different applications, it can be divided into bearings with inner ring or without inner ring. Therefore, the solid ring needle roller bearing can meet the requirements of light weight, small occupied space and large power transmission. Solid ring needle roller bearing has smaller volume and higher bearing capacity.
structural style
Outer ring double retaining edge (or double locking ring) needle roller bearing with cage Na, NKI type
The inner ring and outer ring (with lock ring, full set of needle roller and cage) can be installed respectively. The rotation speed is high and can be divided into single row and double row.
If the shaft cannot be used as a raceway, that is, if it is impossible or uneconomical to harden the shaft by grinding, this kind of needle roller bearing with inner ring can be used.
characteristic
Na and NKI type bearings are RNA and NK type needle roller bearings without inner ring.
The bearing has no inner ring and is suitable for the supporting structure with limited radial installation size. The journal matched with the bearing is directly used as the rolling surface. As the shaft of the raceway surface, the hardware must be quenched and ground, and only when it is processed to the appropriate size and shape accuracy, the whole set of needle roller bearing can have higher service life and operation accuracy. At the same time, because there is no inner ring, the diameter of the shaft can also be appropriately increased, which also increases the rigidity.
Combined type
Combined needle roller bearing is a bearing unit composed of centripetal needle roller bearing and thrust bearing components. It has compact structure, small volume and high rotation accuracy. It can bear a certain axial load while bearing a high radial load. Moreover, the product has various forms of structure, wide adaptability and easy installation.
Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery, printing machinery and other mechanical equipment, and can make the mechanical system design very compact and dexterous
Thrust type
The thrust bearing is composed of thrust cage assembly with needle roller or cylindrical roller or ball and thrust washer. The needle roller and cylindrical roller are held and guided by the thrust cage. When used with different series of DF thrust bearing washers, many different combinations can be provided for bearing configuration. Because the selection of high-precision cylindrical roller (needle roller) increases the contact length, the bearing can obtain high load capacity and high stiffness in a small space. Another advantage is that if the surface of adjacent parts is suitable for raceway surface, the washer can be omitted, which can make the design compact. The cylindrical surface of needle roller and cylindrical roller used in DF thrust needle roller bearing and thrust cylindrical roller bearing is a modified surface, which can reduce the edge stress and improve the service life.
