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INA import bearings are widely used in mechanical support. Its function is to ensure that there is enough in the bearing life conditions, to support the shaft and shaft parts, and the relative rotation, swing movement and rotation of the base, between the friction pairs to reduce as much as possible, in order to obtain the high transmission efficiency. INA import bearings often have set the national standard, it is the use of the principle of design of rolling friction and standard parts, by professional chemical factory mass production. In the mechanical design only according to the working conditions of selecting the appropriate INA bearing imports types and models of composite structure design.
Compared with sliding bearing, INA bearing imports has the following advantages: (1) the application of simple design, the product has been standardized, and by professional manufacturers for mass production, has the interchangeability and versatility of excellent. (2) starting low friction torque, small power loss, INA bearing imports efficiency (0.98-0.99) than the mixed lubrication bearing. (3) load, speed and the working temperature range wide, small change of operating condition has little effect on bearing performance. (4) the majority of type bearing can bear radial and axial load, small axial dimension. (5) easy lubrication, maintenance and maintenance.
INA bearing imports also has the following disadvantages: (1) most of the INA import bearings radial size large. (2) work in the high speed, heavy load conditions, life is short. (3) the vibration and large noise.
1, INA imports bearing structure: INA bearings are generally from the inner ring, outer ring, rolling body and a holding rack. The inner ring is arranged in the shaft neck (in the thrust bearing is called shaft ring), with a tight; the outer ring is installed in a bearing hole frame or parts, usually with a loose. Outer ring raceway, when the inner and outer rings of relative rotation, rolling body along the raceways. Rolling body is the realization of rolling element rolling friction, in addition to the "rotation", but also around the axis of revolution. Shape of spherical, cylindrical, conical cylindrical, needle roller, drum etc.. The holder is the role of the rolling body evenly spaced. In order to meet the requirements of some use, can structure without inner ring or outer ring, or with a dust, sealing ring and some bearing. 2, commonly used materials: the rolling body and the inner and outer rings of material requirements have wear resistance and impact toughness of high hardness and contact fatigue strength, good. The general use of chromium alloy steel, commonly used materials are GCr15, GCr15SiMn, GCr6, GCr9 and so on, after heat treatment the hardness up to HRC61-65. The holder with the general stamping of low carbon steel and high-speed bearing, multi use non-ferrous metal (such as brass or plastic holder).