Characteristics of Needle Roller Bearings

Sep 07, 2021

Needle bearing is a roller bearing with cylindrical rollers, relative to its diameter, rollers are both thin and long. This roller is called a needle roller. Although has a small cross-section, bearing still has high load capacity, needle bearing with fine and long roller (roller diameter D 5 mm or less, acuity 2.5 L/D, L) for the roller length, so the radial structure is compact, its diameter and load capacity at the same time, with other types of bearing outside diameter to a minimum, especially suitable for the limited size of the radial installation supporting structure.

According to the use of different occasions, can be used without inner ring of the bearing or needle roller and cage components, at this time to suit the bearing surface of the surface of the shaft and the shell hole directly as inner and outer rolling bearing surface, in order to ensure the load capacity and operation performance and you have the same ring bearing, axis or shell hole hardness on the surface of the raceway, machining accuracy and surface quality should be as a bearing ring raceway. This kind of bearing can bear radial load only.

Needle roller bearings have large bearing capacity and are suitable for mounting support structures with limited dimensions. The surface of the journal is hardened as the rolling surface, and the bearing is pressed into the seat hole without axial positioning. Bearings should be injected with appropriate amount of grease before installation. In general, after assembly, BK bearings are used for bearing without extension end of the journal. The end face sealing plays a sealing role, and can withstand small axial swimming.

Needle roller bearings are equipped with thin and long rollers (roller length is 3 to 10 times of diameter, diameter is generally not more than 5mm), so the radial structure is compact, its inner diameter size and load capacity and other types of bearing at the same time, the smallest outer diameter, especially suitable for radial installation size limited support structure. Needle roller bearings according to the use of different occasions, processing accuracy and surface quality should be combined with bearing rings, uses. Needle roller bearing is a bearing unit composed of needle roller bearing and thrust bearing components.