Bearing type selection factors ,Bearings that mainly bear radial loads are radial bearings. These bearings have a nominal contact angle of a0<=45 0. The roller bearings of the same size can bear greater radial loads than the ball bearings. n and NU type cylindrical roller bearings can only bear radial loads, other types of radial bearings can bear both radial loads and axial loads.
The main axial load bearing is generally thrust bearing, its nominal contact corner a0>450. thrust bearing and thrust angular contact ball bearing according to the structure of different can simultaneously withstand a or two direction of the axial force. When bearing to the force is particularly high, preferably with thrust cylindrical roller bearings and thrust spherical roller bearings.
Thrust spherical roller bearings and one-way thrust angular contact ball bearings can simultaneously withstand axial load and radial load, other thrust bearings can only withstand axial load.
Support a shaft and bearing usually use fixed bearing and swimming bearing combination of structure. NU type and N type cylindrical roller bearings are the ideal bearings, which can compensate for the length.
The inner and outer rings of the bearing can be used with a tight fit. Sliding-fit length-compensated non-separable bearings (such as deep groove ball bearings and spherical roller bearings) are also available as swivel bearings. One of the two rings of this type of bearing uses a fit without an axial fixing surface. Therefore, the bearing of a collar can be in its support surface activities.
This is a kind of collar can be installed separately bearing, when two collars are used tight fit its advantages are very prominent. Separable bearings include four point contact ball bearings, double half inner circle of double row angular contact ball bearings, cylindrical roller bearings, tapered roller bearings, thrust ball bearings, thrust cylindrical roller bearings and thrust spherical roller bearings.
Misalignment occurs when machining journal mating surfaces or bearing housing mating surfaces, especially when the mating surfaces are not machined in a single mount. Misalignment can also occur when using bearing housings (e.g. flange bearing housings or vertical bearing housings). Misalignment can also occur when the shaft is bent and deformed due to the working load, resulting in the inner and outer rings of the bearing being tilted.
Spherical bearings can compensate for misalignment and tilt, e.g. spherical ball bearings, pennant-shaped roller bearings, radial and thrust spherical roller bearings. These bearings all have a concave spherical outer raceway in which the rolling element and inner ring can be rotated. The ability of these bearings to compensate for shaft centre deflection angles depends on their own type, size and load conditions.
With tapered hole bearing can be directly mounted to the tapered journal (for example: high-precision structure of the single row and double row cylindrical roller bearings). This type of bearing can be installed to adjust the given radial clearance. Most spherical ball bearings with tapered bores, drum roller bearings and spherical roller bearings can be mounted on cylindrical journals via a clamping sleeve. These bearings are particularly easy to mount and dismount.
The stiffness of a bearing usually refers to the force required to produce a certain elastic deformation of the bearing. Bearings on machine tool spindles and pinion shafts require a high degree of stiffness. Due to the different contact conditions between the rolling element and the raceway, the stiffness of roller bearings is higher than that of ball bearings.
In addition to being heated and heat dissipation, internal friction on the working temperature of the bearing also plays a big role in determining. Low friction bearings are: bearing radial load deep groove ball bearings, single row angular contact ball bearings and cylindrical roller bearings with cage. Bearings with contact seals, full complement cylindrical roller bearings and thrust roller bearings all generate high friction.
