Needle roller bearings are roller bearings with cylindrical rollers that are both thin and long relative to their diameter. This type of roller is called a needle roller. Despite its small cross-section, the bearing still has a high load bearing capacity. This bearing is equipped with thin and long rollers, resulting in a compact radial structure.
In recent years, with the development of miniaturization and lightweight of mechanical equipment in various fields such as automobiles, household appliances, industrial robots, household robots, and weapons, bearings installed in more limited spaces must be small in size and light in weight, but also meet the requirements of high load, high rotational accuracy, and high operating stability. This trend will give the bearing more and greater application scenarios and market opportunities in the future.
Needle roller bearings have various structural types and different application ranges, as follows:
1.Stamped outer ring bearings. There are two types of bearings: piercing type and sealing type. Stamped outer ring roller bearings have no inner ring, and the roller needle directly contacts the surface of the shaft. Therefore, the machining accuracy and heat treatment hardness of the shaft should be the same as that of the bearing inner ring.
Scope of application: Stamped outer ring bearings with cages are suitable for high-speed and heavy loads, and are mostly used in gearboxes of machine tools, automobiles, motorcycles, or textile machinery. Stamped ring bearings without cages are suitable for oscillating working conditions under heavy loads due to their full complement of needle rollers. Such as the frame of an aircraft, the shaft end of the main wing, etc.
2.Needle roller and holder assembly. The needle roller and cage assembly are actually bearings without collars.
Scope of application: This type of bearing is mostly used for large and small ends of connecting rods in gearboxes, motorcycles, and automobiles. Due to the temperature rise in the cylinder, the bearings must be resistant to high temperatures.
3.Roller needle bearing
Scope of application: printing machinery, forage machinery, agricultural machinery, CNC equipment guide rollers, conveyor lines, etc.
4.Solid ring bearings Solid ring bearings, commonly used solid ring bearings are NA type and RNA type.
Scope of application: Solid ring bearings are mostly used in machine tools and automotive gearboxes. Their advantages are small radial cross-sectional dimensions and large radial loads. Standard solid ring bearings all have cages, so their rotational speeds are high and can meet the requirements of machine tools and automotive gearboxes.
The above is some introduction to the use range of needle roller bearings. Zhihua is a of needle roller bearings manufacturer from China. We have rich experience in producing needle roller bearings.
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