Rolling with the good points of the four
1. Type Selection
Various types of rolling bearings have different characteristics, for a variety of different machinery usage. Select the bearing type,
Normally should consider the following factors. Under normal circumstances: when to choose when subjected to thrust load thrust bearings, angular contact bearings, for high-speed applications typically use ball bearings withstand heavy radial loads, the selection of roller bearings. In short, the choice of who should be different manufacturers, many bearing products, the selection of the appropriate type.
? bearing space and position occupied by machinery
In mechanical design, general first determine the size of the shaft, and then, depending on the size of the selected axis bearing. Usually small selection of ball bearing shaft, shaft selection of roller bearings. However, when the bearing is limited in the diameter direction of the machine, the selection of needle roller bearings, special light and ultra-light series of ball or roller bearings; when the bearing is limited in the axial position of the machine, the choice of a narrow or special Narrow series ball or roller bearings.
? Bearing suffered load size, direction and nature
Load bearing most important factor is the choice. Roller bearings for heavy loads, ball bearings for light or medium loads, bainite hardening or carburizing steel bearings, can withstand shock and vibration loads.
In terms of the load acting direction, when under pure radial load, can use deep groove ball bearings, cylindrical roller bearings or needle bearings. When subjected to a smaller pure axial load, thrust ball bearings can be used; bear large pure axial load, thrust roller bearings can be used. When the bearing radial and axial joint load, generally used in angular contact ball bearings or tapered roller bearings.
? The self-aligning bearing performance
When different center line and the center line of the shaft bearing, angular error, or because of a large pitch two bearing shaft and the shaft rigidity to small, easy to bend when stressed or tilt, the choice of aligning with good performance tune aligning ball or spherical roller bearings, and an outer ball bearings. Such bearings slightly tilted or at bending the shaft, to maintain normal operation.
Bearing aligning performance is good or bad, instead of permit relating to different axes, different axis higher the value, the better aligning performance. Various types of bearings allowable misalignment in Table 11
? Bearing rigidity
Rigidity of the bearing means bearing deformation-generating unit of the required amount of force. Rolling elastic deformation is small, in most machines do not have to consider, but in some machines, such as machine tool spindles, bearing rigidity is an important factor, the general should be chosen cylindrical and tapered roller bearings. Because these two types of bearings when subjected to load, the rolling element and raceway belong point contact, poor rigidity.
In addition, various types of bearings can also preload, to increase bearing rigidity purposes. Such as angular contact ball bearings and tapered roller bearings, to prevent the shaft vibration, increase the supporting rigidity, often previously applied certain axial force at the time of installation, they pressed against each other. Here, inter alia: the amount of preload is not too large. Is too large, it will increase bearing friction, temperature increase, affecting bearing life.
