Needle bearing is a rotating bearing in which the rolling element is an elongated needle roller bearing. Compared with the ball bearing, it has a small cross-sectional area and volume, but has a higher load capacity, so Needle bearings in constrained components are unique and therefore particularly suitable for applications where radial space is limited.
Needle roller bearings have high-precision roller bearings with low section height. Compared with other types of bearings, needle roller bearings have wider thickness, smaller outer diameter and smaller volume, and can withstand high loads. Therefore, it is very advantageous for mechanical small size, light weight and precision. Under the same frictional force, the rotary torque is lower due to the small radius of gyration, thus improving the mechanical efficiency.
Due to the wide application range of needle roller bearings, there are many different types and models in the design. Generally, needle roller bearings are mainly divided into drawn cup needle roller bearings, one-way drawn cup needle clutch bearings, entity bushed needle roller bearings, thrust needle roller bearings, retainer assembly bearings, rollerscrews bearings, linear bearings, etc. Because of the variety of types, needle bearings can be widely used in automobiles, motorcycles, printing machinery, industrial robots and construction equipment, etc. industry sector.
Drawn cup needle roller bearing(HK Series) is one of the needle roller bearings. It composed of thin walled punched outer ring, retainer and a group of needle rollers. It is usually formed with thin steel plate through precision punching with very sectional height and big load capacity, so it is suitable for the needed of the low cost and mass produced.
Drawn cup needle roller bearing is used between the needle bearings and the bearing cage, and no axial fixture device is required. Even under the condition of high speed and heavy load, the original function of the bearing can be fully maintained, and not to be easily damaged. Due to the high storage volume of grease, the drawn cup needle roller bearing possibly without lubricating for a long time.
The sealed drawn cup needle roller bearings with sealing lips can normally protect the dirt from entering into the bearing and the lubricant leakage.