In the choice of co-ordination, we must first consider the type of load bearing rings. The loads are usually the type of ring has the following three conditions:
A fixed load
Role in the synthesis of radial load on the ring, the ring raceway of the local area is exposed, and reached the shaft or bearing of the relative area of the load as a fixed load. Synthetic fixed radial load is characterized by a relatively static load vector and the ring. Ring and synthetic radial load not rotate or spin the same speed are of a fixed load. Under a fixed load ring can be used with relatively loose.
2 Rotate the load
Role in the synthesis of radial load on the ring, along the circumferential direction of the rotating raceway, in turn borne by the various parts of this load is called a spinning load.
Load is characterized by rotating radial load vector relative to the synthesis of ring rotation. Rotating load has the following three conditions:
(1) load direction is fixed, rotating ring;
(2) load vector rotating, stationary ring;
(3) The load vector and the ring to rotate at different speeds.
3 swing loads and variable loads
Sometimes the direction and size of the load can not exactly determine, for example, high-speed rotating machinery, in addition to the direction of a fixed weight of the rotor to withstand the load out, there is an imbalance caused by the rotation of the quality of the load, if the rotation loads than the fixed load much greater, then the synthetic load is still rotating load; and if the rotating load is much smaller than the fixed load, the load to swing synthetic load. Rotating load regardless of load or swing, the size and direction are constantly changing. Work in the state variable, and some rings but suffered a spinning load when the load may be, but when a fixed load, but when they swing loads. This load is called variable load.
Swinging loads and variable loads in line with the load should be treated equally with the rotation, too loose with the cooperation will lead to surface damage.
Direction of rotation relative to the load ring and shaft or housing bore, the transition should be selected with or interference fit. Size of interference in the load bearing work, the ring on the shaft or hole with the surface of the seat does not have a "creep" phenomenon as a principle. In very light load, heavy load or low speed rotation under the ring occasionally, with the choice of transition, when shaft surface should have a higher hardness and smaller surface roughness.
For heavy load situations, should normally be lighter than normal load in the load and with a compact. Load more weight, the greater should be its interference with.