Directed to bear the load of the ring can be used looser fit.

Load character selection with load should first consider the case of rotation vector relative to the ferrule. In accordance with the synthetic radial load vector relative to the rotating ring case, the load on the ferrule can be divided into: a fixed load, rotational load and swing load, shown in Figure 2-2.
a. fixed load is applied to the synthesis of radial load on the ring by ring raceway of the local area is exposed, and transmitted to the shaft or bearing the appropriate local area, this load is called a fixed load. Its characteristics are synthetic radial load vector with ferrule relatively static. Directed to bear the load of the ring can be used looser fit.
b. rotational load acting on the radial load on the composite ring raceway along the circumferential direction of rotation, sequentially from the various parts of the exposure, this load is called rotational load, which is characterized by the synthesis vector with respect to the radial load rotating ferrule . Withstand the rotational load of the ring tight fit to be elected, in exceptional circumstances, such as the load is very light, or under heavy load low speed only occasionally rings, bearings use hard materials and surface roughness is higher, rotating load to bear Rings can also be used looser fit.
c. swing load acting on the ring a synthetic variable radial load direction, this load is called Precision bearing load or non-directional load, which is characterized by the synthesis of the role of the ferrule of the ferrule radial load vectors must raceways swing area for a certain region is exposed raceway, or acting on skf bearings the load is on the impact load, vibration loads, the direction, the load values ​​change frequently. Have to bear the load bearing swing, jackets circle and weeks, bearing, the hole should be adopted with a tight fit.
2.3 load size between the ring and the shaft or housing over the load depends on the size of the win, the heavier the load using a larger amount over win, the lighter the load using a smaller amount over win. Usually equivalent radial load p into "light", "normal", "heavy" load three cases, the dynamic load rating of the bearing off series of c in Table 2-1, alternative shaft and housing bore tolerance zone reference.
2.4 shaft and housing bore tolerance band selected according to the size and nature of the load, on the axis and with a defined tolerance Commission controllable in Table 2-2 - Table 2-4 inside.
2.5 mating surface roughness and tolerance with surface roughness and tolerance, direct impact on product performance, such as wear resistance, corrosion resistance and with nature. Therefore, a reasonable requirement shaft and housing bore with geometric tolerance and surface roughness raised demands for a stable complex nature and improve fit over the connection strength is essential to win.