1 bearing with the selection
(A) cylindrical bore bearings
Select bearing with several major factors that should be considered as follows:
① the type of load
Role in the load on the bearings, rings rotating rings are to bear the load can be divided into a fixed load, slewing load and oscillating load.
a fixed load
Synthetic radial load borne by the ring raceway local area, and accordingly passed to the axis or the surface of the shell with the appropriate local area wind. This load is called a fixed load.
The fixed-load characteristics of the synthetic radial load is relatively static and ferrule. Under a fixed load ring generally can choose a more loose fit.
b rotary load
Acting on the vector of the synthesis of radial load on the bearing rings rotating along the circumferential direction of the raceway, followed by exposure to all parts of the raceway, and passed to all parts of the surface of the shaft shell hole. This load is called a rotary load, also known as cyclic loading.
Rotary load is characterized by the synthesis of radial load vector and the ferrule relative rotation. Under rotating load ring and shaft or housing holes should be used to filter or interference fit. If the gap with the installation, the slip phenomenon occurs between each other, which will lead to wear of the contact surface, friction heat, the temperature increased sharply, bearing damage quickly. Together the size of the amount of interference based on the functioning of the bearing load of work, without causing the rings in the mating surface on the shaft or shell hole "crawling" phenomenon of the principle.
C. swing load
Role in the synthesis of radial load on the bearing ring vector of oscillation in a certain region of the ring raceway is exposed to a certain area of ??the raceway, and the phase to pass to the shaft or shell holes on the surface of a certain region, or acting on the bearing The load on the shock loads, vibration loads, load direction or values ??change frequently, the load is called the swing load, also known as not the direction of load.
Bearing swing load, especially in heavy duty, inside and outside the circle shall be used for the interference fit. The inner swing rotation, it is usually the inner ring with the rotary load. Sometimes, however, the outer bearing shell outside to swim or load lighter, can be used with rotary load is slightly loose.
To ② load size
Bearing ring in the radial component under load, the radial will be compressed easily cause with relaxation, especially in the case of return to turn the load, prone to skidding. Therefore, for heavy-duty situations should normally be co-ordination than the light load and normal load situations a much tighter. In short, the load is heavier, cooperated with the surplus amount shall be the greater.
③ operating temperature
Bearing when in operation, because the rings of operating temperature is usually higher than the temperature of the adjacent parts, the bearing inner ring may be due to thermal expansion and the bearing loosening the outer ring may be due to thermal expansion affect the bearing axial clearance, so in the choice of must ⒁ Ning palpitate Alice hereby ? Lai Chennai exposed the alkyne huge banner push Cong co-ordination, but ? crowded than the Jie? BR> (4) rotation accuracy
When the rotation of the bearing accuracy and operation of stationary higher, in order to eliminate the influence of elastic deformation and vibration of the bearing components, the bounden can avoid using clearance fit.
The ⑤ axis and the shell structure and material
If the shaft and housing (box) surface hole open shape irregular, will result in the bearing, the outer ring is not normal deformation and discontinuity. Outside the enclosure (box) body should not be used with the bearing outer ring with the interference fit, they should not make the outer shell (box) hole rotation. When the bearing is installed in a hole or hollow shaft of thin-walled, light alloy casing (box), in order to ensure that the bearings have sufficient bearing surface should be used to install the body or solid body of the thick-walled enclosure (box), cast iron housing (box) selected with the shaft must bear some.
The ⑥ installation and dismantling
In many complex structural applications, in order to facilitate the installation and removal requires the use of clearance fit. Bearing operation, such as interference fit may be separation of bearings (outer ring can be mounted on the cylindrical roller bearings, needle roller bearings, tapered roller bearings and thrust bearings) or conical bore bearings, allows easy loading and unloading.
The ⑦ non-fixed end bearings of the axial displacement
This displacement is required to install a ring of non-fixed side of the bearing in the axial direction of the swimming gap. Usually under fixed load ring (outer ring) to the gap with the installation. If the edge of the inner or outer ring no file cylindrical roller bearings (2000 and 3200) or needle bearings installed in the non-fixed end, the inner and outer rings are made of the interference fit.
(2) conical bore bearings
Conical bore of the bearing, the more convenient installation and removal can be installed directly on the cone of the journal or external to the middle of the tapered cylinder sleeve (adapter sleeve, withdrawal sleeve), and then the edge set The tube is installed along the cylindrical axis.
The bearing outer ring and housing (box) hole with a cylindrical bore bearing the same rules.
With adapter sleeve or bush retreat unloading non-separable type bearings can be used for tolerances larger bearing axis geometric tolerance must be in strict control.
(2) the bearing and shaft and housing fits
The bearings and shaft with the hole basis, bearing shell with the axis system. Bearings and shaft with the machine manufacturing tolerances with the system of bearings tolerance negative tolerance, therefore, in the same line with the conditions, the bearing bore and shaft with more than usual with more closely. Bearing OD tolerance negative tolerance, the tolerance values ??and the general tolerance system is not the same.



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