What is needle roller bearing
Needle roller bearings are roller bearings with cylindrical rollers, which are thin and long relative to its diameter. Although there are small parts, bearings still have a higher load capacity, needle roller bearings are equipped with thin and long rollers, so the radial structure is compact, the size of the inner diameter and load capacity is the same as other types of bearings, the outer diameter is the smallest, especially suitable for radial installation size is limited support structure.
The characteristics of needle roller bearing
Needle roller bearings are equipped with slender rollers, so the radial structure is compact, the inner diameter and carrying capacity are the same as other types of bearings, the outer diameter is the smallest, especially suitable for the radial mounting size of limited supporting results.
According to different occasions, you can use without the inner ring of the bearing or needle roller and cage components, at this time should be suitable for the surface of the shaft and shell holes on the surface of the bearing as the inner and outer rolling bearing surface directly, in order to ensure that the bearing capacity and operating performance is the same as the ring, the axis or shell hole in the raceway surface hardness, the machining accuracy and surface quality should be same as the ring bearing raceway.
Analysis of common fault causes of Needle Roller Bearings
1. Careless inspection before assembly: the bearing should be cleaned before assembly and carefully check the inner and outer seat ring, rolling body and cage of the bearing to see if there is rust, burr, bump and crack; Check whether the bearing clearance is proper. Whether the rotation is brisk and free, whether there is a phenomenon of sudden jam; At the same time, check the size, roundness and cylindricity of the shaft diameter and bearing seat hole and whether there is burr or four convex inequality on its surface.
2. Improper assembly method: when the interference of bearing and shaft diameter or bearing seat hole is small, the pressing method is used for assembly. The simplest method is to use a copper rod and a hand hammer to beat the seat ring of the bearing with interference fit symmetrically in a certain order, so that the bearing is pressed into smoothly. In addition, can also be made of soft metal sleeve by hand hammer or press into. If the operation is improper, it will make the seat ring deformation and cracking, or the hand hammer hit the seat ring with non-interference, it will make the raceway and the rolling body indentation or the bearing is destroyed indirectly.
3. Improper temperature control during assembly: when needle roller bearing is assembled, if its interference with the shaft diameter is large, thermal assembly method is generally adopted. The bearing is put into an oil barrel containing oil, and the oil barrel is heated externally with hot water or flame. The oil temperature required by the process is controlled at 80℃~90℃, generally not more than 100℃, or at most not more than 120℃. After the bearing is heated, it is quickly removed from the sleeve on the journal. If the temperature is not properly controlled and the heating temperature is too high, the bearing will be tempered and the hardness will be reduced, and the bearing will be easy to wear, peel and even crack in operation.
The price of needle roller bearings
The price of needle roller bearings is affected by many factors, such as market, material and quotation. If you want to know the specific price of needle roller bearings, please contact us for inquiry.
Needle roller bearing supplier :BMB Bearing
BMB Bearings is the complete one-stop supplier of OEMs and wholesalers to purchase high precision, miniature ball bearings, industrial ball bearings related products, as well as related professional services, including world class engineering and design. If you have any need, please feel free to contact us.