Needle Roller Bearings and scope of knowledge classification

Needle Roller Bearings and scope of knowledge classification
    Needle roller bearings consist of rings, needle roller cage. For the same carrying capacity, the smallest cross section of needle roller bearings. Suitable for high speed, large load, bearing small space applications. Needle roller bearings, also known as needle-shaped, elongated shape. Both ends of the needle shape of a round, tapered tip, and the head concave arc.
       Commonly used needle bearings have the following structure type:
     (1) Drawn cup needle roller backing bearings
     This bearing type of perforation and sealing type two, drawn cup needle roller bearings without inner ring, needle direct surface contact with the shaft, so the shaft machining accuracy and heat treatment hardness should be the same with the bearing inner ring. There are cages Needle roller bearings for high-speed, heavy duty, used machine tools, automobiles, motorcycles gearbox or textile machinery. No stamping cage ring needle roller bearings, needle roller filled due for heavy load swing working conditions. Rack such as aircraft, missiles shaft end of the main wing
2) physical ring needle roller bearings
     Entity ferrule needle roller bearings, needle roller bearings commonly used physical ring of NA-and RNA-based. Physical ring needle roller bearings are used for machine tools, auto gearbox, it has the advantage of small size radial section, carrying a large radial load. Standard type of physical ring needle roller bearings have cages, so high speed, can adapt to the machine, automotive transmission requirements.
  (3) Combined needle roller bearings
   Combined needle roller bearings, needle roller bearings is the physical ring and ball bearings, roller bearings together.
(4) Needle roller and cage assemblies
       Needle roller, cage assemblies, in fact, no ferrule needle roller bearings, these bearings are used for transmission, motorcycle, automobile connecting rod big and small clients. As the cylinder temperature rises, so the bearing to high temperatures.