Needle Roller Structure Type

Needle roller bearings are composed of ferrules, needle rollers, and cages. For the same load-bearing capacity, needle roller bearings have the smallest cross-sectional dimensions.They are suitable for situations with high speed, large load, and small bearing space. Needle roller bearings are also called needle rollers, and are slender in shape. The shapes of the two ends of the needle rollers are round heads, pointed cones, and concave arc heads.
Common needle roller bearings have the following structural types:
1. Needle roller bearings with stamped outer rings:
This type of bearing has two types: perforated type and sealed type. Stamped outer ring needle roller bearings have no inner ring, and the needle rollers are in direct contact with the surface of the shaft, so the machining accuracy and heat treatment hardness of the shaft should be the same as those of the inner ring of the bearing. Stamped outer ring needle roller bearings with cages are suitable for high speed and heavy load, and are mostly used in machine tools, automobiles, motorcycle gearboxes, or textile machinery. Stamped ferrule roller bearings without cages are filled with needle rollers and are suitable for swinging working conditions under heavy loads. Such as aircraft frames, shaft ends of missile main wings, etc.
2. Solid ring needle roller bearings:
The solid ring needle roller bearings, commonly used solid ring needle roller bearings are NA type and RNA type. Solid ring needle roller bearings are mostly used in machine tools and automobile gearboxes. Its advantages are small radial cross-section size and large radial load. Standard solid ring needle roller bearings have cages, so the speed is higher and can meet the requirements of machine tools and automobile gearboxes.
3. Combined needle roller bearings:
Combined needle roller bearings are a combination of solid ring needle roller bearings, ball bearings and roller bearings.
4. Needle roller and cage assembly:
The needle roller and cage assembly is actually a needle roller bearing without a ring. This type of bearing is mostly used for the large and small ends of the connecting rod of gearboxes, motorcycles, and automobiles. Due to the increase in the temperature inside the cylinder, the bearing must be resistant to high temperatures.