Whether the bearing is installed or not will affect the accuracy, life and performance of the bearing. Therefore, please fully study the installation of the bearing, that is, install the bearing in accordance with the operating standards including the following items.
●, cleaning bearings and related parts, (for grease-lubricated bearings and double-sided oil seals or dust caps, seal bearings need not be cleaned before installation.)
●, check the size and finishing of related parts
●, installation method
The bearing should be installed according to the bearing structure, size and the matching nature of the bearing components. The pressure should be directly applied to the end face of the ferrule. The pressure should not be transmitted through the rolling element. The following methods are generally used for bearing installation:
The inner ring of the bearing is tightly matched with the shaft. When the outer ring and the bearing housing hole are loosely fitted, the bearing can be press-fitted on the shaft first, and then the shaft is fitted into the bearing housing hole together with the bearing. On the end face of the bearing inner ring, a mounting sleeve (copper or mild steel) made of soft metal material is used.
The bearing outer ring is tightly matched with the bearing housing hole. When the inner ring and the shaft are loosely fitted, the bearing can be first pressed into the bearing housing hole. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the housing hole.
If the bearing ring and the shaft and the seat hole are tightly fitted, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time, and the structure of the assembly sleeve should be able to simultaneously tighten the end faces of the inner ring and the outer ring of the bearing.
b. Heating coordination
By heating the bearing or housing, the thermal fit is used to transform the tight fit into a loose fit installation method. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before the hot assembly, put the bearing or the ferrule of the separable bearing into the fuel tank and heat it evenly at 80-100 °C, then take it out of the oil and load it on the shaft as soon as possible. After the cooling is prevented, the inner ring end face and the shoulder are not tightly attached, and the bearing can be axially fastened after cooling. When the outer ring of the bearing is tightly fitted with the bearing seat made of light metal, the hot-filling method of the heated bearing seat can avoid the abrasion of the mating surface.
When heating the bearing with the fuel tank, there should be a grid at a certain distance from the bottom of the box, as shown in Figure 2-7, or the bearing is hung with a hook. The bearing cannot be placed on the bottom of the box to prevent the sinking of impurities into the bearing or uneven. Heating, there must be a thermometer in the fuel tank, strictly control the oil temperature should not exceed 100 °C, to prevent tempering effect, so that the hardness of the ferrule is reduced.
c. Installation of thrust bearings
The full complement of the thrust bearing and the shaft is generally a transition fit. The fit between the race and the bearing bore is generally a clearance fit. Therefore, the bearing is easier to install. The shaft spring of the two-way thrust bearing should be fixed on the shaft to prevent relative Rotate on the shaft.
The mounting method of the bearing is generally the case where the shaft rotates. Therefore, the cooperation between the inner ring and the shaft is a win-win cooperation, and the cooperation between the outer ring of the bearing and the bearing chamber is a clearance fit.
●, bearing operation check
After the bearing is installed, check the operation immediately and confirm that the installation is normal.
Influence of bearing structure on vibration and noise