Solid ring needle roller bearings are composed of one or two rings and a needle roller set with a cage. This type of bearing is characterized by small space occupation and high power transmission, and is particularly suitable for support structures with limited radial installation dimensions. Solid ring needle roller bearings are widely used in various occasions that require high load capacity and compact structure, such as machine tools, automobile gearboxes, etc. Due to its compact structure, small radial size and large load capacity, it is particularly suitable for support structures with strictly limited radial installation dimensions.