The structure of the drawn cup needle roller bearings is diverse, and the applicable scope is also different. The details are as follows:
(1) Needle roller bearings with drawn outer ring. This kind of bearing has two types of perforated type and sealed type. The drawn outer ring needle roller bearing has no inner ring, and the needle directly contacts the surface of the shaft, so the machining accuracy and heat treatment hardness of the shaft should be the same as the bearing inner ring. Scope of application: Drawn cup needle roller bearings with cage are suitable for high speed and heavy load, and are mostly used in gearboxes or textile machinery of machine tools, automobiles and motorcycles. Drawn cup needle roller bearings without cages are suitable for oscillating working conditions under heavy loads because they are filled with needle rollers. Such as the frame of the aircraft, the shaft end of the main wing of the missile, etc.
(2) Solid ring needle roller bearings Solid ring needle roller bearings, commonly used solid ring needle roller bearings are NA type and RNA type. Scope of application: Solid ring needle roller bearings are mostly used in machine tools and automobile gearboxes. Its advantages are small radial cross-sectional size and large radial load. Standard solid ring needle roller bearings have cages, so the speed is higher, which can meet the requirements of machine tools and automobile gearboxes.
(3) Scope of application of roller and needle bearings: printing machinery, pasture machinery, agricultural machinery, rollers for NC equipment guide rails, conveyor lines, etc.
(4) Needle roller and cage assembly. The needle roller and cage components are actually needle roller bearings without ferrules. The scope of application: This kind of bearing is mostly used for the large and small ends of the connecting rods of gearboxes, motorcycles and automobiles. As the internal temperature of the cylinder increases, the bearings must be resistant to high temperatures.