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Analysis of the correct way of bearing device
Source: Bearing network time: 2014-09-06
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â—, remove the bearings and associated parts; (for grease-smooth bearings and double-sided oil seals or dust caps; seal ring bearing device does not need to be removed.)
â—, to view the dimensions and finishing conditions of the associated parts â—, device means bearing device should be based on the bearing layout; scale size and the cooperative nature of the bearing components; the pressure should be directly added to the tight end face of the ferrule; Body transfer pressure; bearing devices usually use the following methods:
a. Pressing the inner ring of the cooperative bearing and the shaft to make a tight cooperation; when the outer ring and the bearing housing hole are loosely engaged; the bearing can be first pressed on the shaft by the press; then the shaft is loaded into the bearing housing hole together with the bearing; Mounted on the end face of the inner ring of the bearing; padded with a device made of soft metal material (copper or mild steel).
The outer ring of the bearing is tightly cooperated with the hole of the bearing seat; when the inner ring and the shaft are loosely engaged; the bearing can be first pressed into the hole of the bearing seat; at this time, the outer diameter of the casing of the device should be slightly smaller than the diameter of the seat hole.
If the bearing ring and the shaft and the seat hole are tightly cooperated; the inner ring and the outer ring of the device should be pressed together into the shaft and the seat hole; the layout of the device bushing should be able to tightly close the end faces of the inner ring and the outer ring of the bearing.
b. Heating cooperation through heated bearings or housings; using thermal expansion to transform tight cooperation into a loosely cooperating device approach. It is a common and labor-saving device approach. This method is suitable for devices with large interference bearings; The bearing or the ferrule of the separate bearing is placed in the fuel tank and heated evenly at 80-100 ° C; then it is taken out from the oil and quickly loaded onto the shaft; in order to avoid the cooling, the end face of the inner ring and the shoulder are not tight; after the bearing is cooled, Then the axial fastening is carried out. When the outer ring of the bearing is tightly cooperated with the bearing seat made of light metal; the hot-filling method of the heated bearing seat is adopted; the cooperating surface can be prevented from being scratched.
When heating the bearing with the oil tank; there should be a grid at a certain distance from the bottom of the tank; as shown in Figure 2-7; perhaps the bearing is hung with a hook; the bearing cannot be placed on the bottom of the tank; to prevent sinking impurities from entering 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 avoid the tempering effect; the hardness of the ferrule is reduced.
c. Thrust bearing device The complete cooperation of the thrust bearing with the shaft is usually a transitional cooperation; the cooperation between the race and the bearing housing hole is usually the cooperation of the gap; therefore, the bearing is easier to install; the shaft spring of the double-way thrust bearing should be fixed on the shaft. ; to avoid relative to the axis transition.
The device method of the bearing; under normal conditions, the shaft rotation is mostly; therefore, the cooperation between the inner ring and the shaft is a win-win cooperation; the cooperation between the outer ring of the bearing and the bearing chamber is cooperation with the gap.
â—, bearing work to see the bearing device is completed; should be checked immediately; it has been determined whether the device is normal.
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