Features and uses of needle roller bearings

Needle roller bearings are equipped with thin and long rollers (the length of the rollers is 3 to 10 times the diameter, and the diameter is generally not more than 5mm), so the radial structure is compact, and its inner diameter and load capacity are the same as other types of bearings. Small diameter, especially suitable for bearing results with limited radial installation size. According to different applications, bearings without inner rings or needle roller and cage assemblies can be selected. As the inner and outer rolling surfaces of the bearing, in order to ensure the same load capacity and running performance as the bearing with rings, the hardness, machining accuracy and surface quality of the raceway surface of the shaft or housing hole should be similar to the raceway of the bearing ring. The bearing can only bear radial load. The release bearing is composed of a raceway ring, a needle roller and a cage assembly. It can be combined with a thin raceway ring (W) or a thick raceway ring that is cut and processed. Non-separable bearings It is an integral bearing composed of a precision stamped raceway ring, a needle roller and a cage assembly. It can withstand unidirectional axial loads. This type of bearing occupies a small space and is beneficial to the compact design of machinery. Most of them only use needle rollers and cages. Components, and use the shaft and the mounting surface of the housing as the raceway surface. Mainly applicable cages: steel plate stamping and holding, synthetic resin forming cages. , Radial needle roller and cage assembly (K type) 2. Needle roller bearing with double lock ring on the outer ring (NA type, NK type)</a>type) 3. Single-row needle roller bearings with double ribs on the outer ring (type NA, RNA</a>Type, NK type) 4. Double row needle roller bearings with double ribs on the outer ring (NA type,>RNA</a>type) Note: NA type bearing bears radial load and has a small outer diameter, which is especially suitable for the structure with limited radial installation size and high limit speed. 5. Drawn cup needle roller bearings (HK type, BK type) type) Note: This kind of bearing has low cost and large bearing capacity, and is suitable for the support structure with limited installation size. The surface of the journal is hardened as the rolling surface, and the bearing is fitted into the seat hole by press fit, and it is not necessary to carry out any further work on it. Axial positioning. The bearing should be injected with an appropriate amount of grease before installation. Usually, no need to lubricate after assembly. BK type bearings are used in the support of the journal without projecting end. The end face is closed for sealing and can withstand small axial swimming forces.

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