The needle bearing is roller bearing with a cylindrical roller, which is both thin and long with respect to its diameter. In spite of the smaller cross section, the bearing still has a high load bearing capacity. The needle bearing is equipped with thin and long rollers, therefore its radial structure is compact. When the inner diameter size and load capacity are the same as those of other types, the outer diameter is the smallest, which is particularly suitable for a support structure in which the radial installation size is limited.
Application of needle roller bearing
It is widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other machinery and equipment, and mechanical design can be more compact and smart.
Type of needle roller bearing
◆ Drawn cup needle roller bearings
Drawn cup needle roller bearings typically consist of a thin-section drawn cup, needle rollers, and a cage assembly. Drawn cup needle roller bearings are a special bearing design, primarily used where installation space is limited and the housing bore is not suitable for use as a raceway. The outer ring is precision stamped from thin steel plates. It has a small structural space but a large load capacity, making it suitable for applications with limited installation space.
◆ Solid needle roller bearings
Solid needle roller bearings are composed of one or two rings and a needle roller set with a cage. Due to its compact structure, small radial size and large load capacity, it is particularly suitable for supporting structures with strictly restricted radial installation dimensions. Solid needle roller bearings are widely used in various occasions that require high load capacity and compact structure, such as machine tools, automobile gearboxes, etc.
◆ Cage & roller assemblies
The needle roller and cage assembly is an independent rolling element, mainly composed of a cage and needle rollers, without the bearing inner and outer rings. This design makes it particularly suitable for situations where the shaft and bearing housing can serve as raceways, and can provide high load and high rigidity capabilities in a narrow radial structural space. In addition, they offer high rotational accuracy, easy installation conditions, and low production costs, making them very popular in applications that require high-precision and low-cost solutions.
◆ Needle roller thrust bearings
Needle roller thrust bearings consist of cage and needle roller assemblies, featuring a surface-hardened cage made of two precision-pressed steel plates. The rollers are securely held within the cage, ensuring stable and smooth rotation even under significant axial loads. Due to their compact size, these bearings can readily replace conventional thrust washers within the same mounting space.
They are available in a variety of configurations, including standalone assemblies, integrated raceway units, and units with varying race thicknesses to suit different mounting requirements around the bearing.
Needle roller thrust bearings are commonly used in applications such as planetary gears in automobiles, constant mesh gearboxes, torque converters, as well as in axial piston pumps and compressors.
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