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What is needle roller bearing
Needle roller bearings are equipped with thin and long rollers (roller length is 3~10 times the diameter, the diameter is generally not greater than 5mm), so the radial structure is compact, its inner diameter size and load capacity and other types of bearings at the same time, the outer diameter is the smallest, especially suitable for radial installation size limited support structure. Needle roller bearings without inner rings or needle roller and cage components can be selected according to different use occasions. At this time, the journal surface and shell hole surface matching with the bearing are directly used as the inner and outer rolling surface of the bearing. In order to ensure that the load capacity and running performance are the same as those of bearing with rings, the hardness, machining accuracy and surface quality of the shaft or shell hole raceway surface should be the same as that of the bearing ring. Composite needle roller bearing is a bearing unit composed of radial needle roller bearing and thrust bearing components. Its compact structure, small volume, high rotation accuracy, can bear a high radial load at the same time to bear a certain axial load. And the product structure of various forms, wide adaptability, easy to install. Composite needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery, printing machinery and other mechanical equipment, and can make the design of mechanical system is very compact and dexterous.
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