Needle roller bearings for FAG are roller bearings with cylindrical rollers that are thin and long relative to their diameter. This type of roller is called a needle roller. Despite its smaller cross-section, the bearing still has a high load-bearing capacity. Needle roller bearings for FAG are 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 the inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest. It is especially suitable for support structures with limited radial installation dimensions. Depending on the application, a bearing without an inner ring or a needle roller and cage assembly can be selected. At this time, the journal surface and shell hole surface matching the bearing are directly used as the inner and outer rolling surfaces of the bearing to ensure the load capacity and operating performance. As with ring bearings, the hardness, machining accuracy and surface quality of the shaft or housing hole raceway surface should be similar to the raceway of the bearing ring. This kind of bearing can only bear radial load.
Type: open drawn outer ring needle roller bearing (1), closed drawn outer ring needle roller bearing (2), needle roller bearing with inner ring (3) and needle roller bearing without inner ring/no inner ring and no cage roller Needle bearing (4), filled needle bearing (5) with and without cage.
Stamped outer ring type: Stamped outer ring needle roller bearings are needle roller bearings with a thin stamped outer ring. Its main feature is that the cross-section height is very low and the load-bearing capacity is high. It is mainly used for bearing configurations that are compact in structure, cheap in price, and the inner hole of the bearing box cannot be used as the raceway of the needle roller cage assembly. Bearings and bearing housings must be installed with an interference fit. If the axial positioning functions such as box shoulders and stop rings can be omitted, the inner hole of the bearing box can be made extremely simple and economical. Drawn outer ring needle roller bearings installed on the shaft end are available in double-sided open type and single-sided closed type. The base end face of the closed stamped outer ring can withstand a small axial guidance force. Stamped outer ring needle roller bearings generally do not come with an inner ring. In situations where the journal cannot be hardened and ground, the inner rings listed in the table can be used. The hardened steel plate outer ring of drawn cup needle roller bearings is inseparable from the needle roller cage assembly. Free space for lubricant storage allows extended relubrication intervals. Bearings generally adopt a single row design. Except for the wider bearing series 1522, 1622, 2030, 2538 and 3038, which are equipped with two needle roller cage assemblies. The outer ring of the bearing has lubricating oil holes. According to user needs, all single-row stamped outer ring needle roller bearings with shaft diameter greater than or equal to 7mm can be equipped with outer rings with lubricating oil holes (code suffix AS1). Drawn outer ring needle roller bearings with oil seals In situations where oil seals cannot be installed due to space constraints, drawn outer ring needle roller bearings with open or closed ends (3 to 5) with oil seals are available. This type of bearing is equipped with a friction-type oil seal of polyurethane or synthetic rubber, which is filled with lithium-based grease with good anti-rust properties, and is suitable for operating temperatures from -20 to +100°C. The inner ring of the bearing with oil seal is 1mm wider than the outer ring. This ensures that the oil seal works well and avoids contamination of the bearing when the shaft has a slight displacement relative to the bearing box. The inner ring of the bearing also has a lubrication hole, which can be re-lubricated by the outer ring or the inner ring according to the needs of the bearing configuration.
Solid ring needle roller bearings are composed of one or two rings and a needle roller group with a cage. Depending on the application, it can be divided into bearings with or without inner rings. Therefore, solid ring needle roller bearings can meet the requirements of light weight, small space occupation, and high power transmission. Solid ring needle roller bearings have smaller volume and higher load-bearing capacity. Structural type: double ribs on the outer ring (or double locking ring) with cage. Needle roller bearings NA, NAV, and NKI can be installed with the inner ring and outer ring (with locking ring, a complete set of needle rollers and cages) respectively. They have high authority and high speed. There are two types: single row and double row. This type of needle roller bearing with an inner ring can be used if the shaft cannot be used as a raceway, that is, if hardening and grinding the shaft is not possible or economical. Features NA and NKI type bearings without inner rings are RNA and NK type needle roller bearings. This kind of bearing has no inner ring and is suitable for support structures with limited radial installation size. The journal matching the bearing directly serves as the rolling surface. As the raceway surface, the shaft must be hardened and ground, and only when it is processed to appropriate size and shape accuracy can the entire set of needle roller bearings have a higher service life and operating accuracy. At the same time, since there is no inner ring, the diameter of the shaft can be appropriately increased, thus increasing the rigidity.
Combined type: Combined needle roller bearing is a bearing unit composed of radial needle roller bearings and thrust bearing components. It has a compact structure, small size, and high rotation accuracy. It can withstand high radial loads and a certain axial load at the same time. Moreover, the product structure is diverse, adaptable and easy to install. Combined needle roller bearings are widely used in various mechanical equipment such as machine tools, metallurgical machinery, textile machinery, and printing machinery, and can make the mechanical system design very compact and smart.
Thrust type: Thrust bearings consist of a thrust cage assembly with needle rollers or cylindrical rollers or balls and a thrust washer. The needle rollers and cylindrical rollers are held and guided by thrust cages. When used with different series of DF thrust bearing washers, many different combinations of bearing configurations are available. Due to the use of high-precision cylindrical rollers (needle rollers) to increase the contact length, this bearing can achieve high load capacity and high stiffness in a small space. Another advantage is that if the surface of the adjacent parts is suitable for the raceway surface, the washer can be omitted, making the design compact. The cylindrical surfaces of the needle rollers and cylindrical rollers used in DF thrust needle roller bearings and thrust cylindrical roller bearings are: Modified surface can reduce edge stress and improve service life.
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