Needle roller bearings can be divided into many different types, such as solid ring needle roller bearings, roller needle roller bearings, stamped outer ring needle roller bearings, etc. These needle roller bearings are different in structure and form, and their use range is targeted, can not be confused.
For example, the commonly used solid ring needle roller bearings are NA type and RNA type. They are basically used in machine tools and automotive gearboxes. Because of their small radial cross-section size and large radial load, the bearings meet the application requirements of these occasions. Especially the standard solid ring needle roller bearings, because of the increase of cage, so high speed, can meet the requirements of machine tools, automotive gearboxes.
Secondly, roller needle roller bearings are actually ring-less needle roller bearings, which are mostly used in gearboxes, motorcycles, automobiles connecting rods large and small end. Because the temperature in the cylinder rises, bearings should be high temperature resistant, and roller needle roller bearings just meet this requirement.
Stamping outer ring needle roller bearings can be simply divided into perforated and sealed type, but no matter which type is without inner ring, so the needle is directly in contact with the surface of the shaft, so the processing accuracy and heat treatment hardness of the shaft should be the same as that of the inner ring of the bearing.
By virtue of this characteristic, the needle-roller bearing with the outer ring of stamping with cage is suitable for high-speed and heavy-duty occasions, mostly used in the transmission of machine tools, automobiles, motorcycles or textile machinery; the needle-roller bearing without cage is filled with needle-roller inside, and the swinging working conditions under heavy load match it, such as the frame of aircraft, the axle end of missile main wing, etc.
