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Summary of bearing device method and bearing disassembly method
Source: China Bearing Network Time: 2013-03-12
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Bearing device method The bearing device is good or bad; it will affect the bearing accuracy, life and function. Therefore; please fully study the bearing device; that is, please follow the operating specifications including the following items to carry out the bearing device.
1. Clear the bearing and related parts to the grease-smooth bearing and the double-sided oil seal or dust cover; the seal ring bearing device does not need to be removed.
Second, to view the dimensions and finishing conditions of the associated parts. III. Device The bearing device should be based on the bearing layout; the size of the scale and the cooperative nature of the bearing components; the pressure should be added directly to the 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; Installed on the end face of the inner ring of the bearing; pad a device casing made of soft metal material (copper or mild steel); the inner diameter of the casing of the device should be slightly larger than the diameter of the journal; the diameter of the outer diameter should be slightly smaller than the inner ring of the bearing庋乖诒 庋乖诒 3 苌. The outer ring of the bearing and the bearing housing hole tightly cooperate; when the inner ring and the shaft are loosely cooperative; the bearing can be pressed into the bearing housing hole first; Less than the diameter of the seat hole. If the bearing ring is tightly engaged with the shaft and the seat hole; 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 hold the inner ring of the bearing together and The end face of the outer ring.
b. Heating cooperation through heating bearings or bearing blocks; using thermal expansion to transform tight cooperation into loose cooperation device method. It is a common and labor-saving device method. This method is suitable for devices with large interference bearing; before hot loading Put the bearing or the ferrule of the separate bearing into the fuel tank and heat it evenly at 80-100 °C; then remove it from the oil and load it on the shaft; to avoid the inner ring end face and the shoulder joint are not tight after cooling; after the bearing is cooled It can be used for axial fastening. When the outer ring of the bearing is tightly combined 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 the bearing is heated by the oil tank; There should be a grid at the place; perhaps the bearing should be hung with a hook; the bearing should not be placed on the bottom of the box; to prevent sinking impurities from entering the bearing or uneven heating; there must be a thermometer in the tank; strictly control the oil temperature should not exceed 100 °C; The tempering effect of the attack; the hardness of the ferrule is reduced.
c. The tapered bore bearing of the tapered bore bearing can be mounted directly on the tapered journal; or the tapered surface of the adapter sleeve and the withdrawal sleeve; the degree of tightness of the cooperation can be measured by the reduction of the radial clearance of the bearing; Therefore, the radial clearance of the bearing should be measured before the device; during the installation process, the clearance should be measured to reach the required clearance reduction; the lock nut device is usually used in the device; the heating device can also be used.
d. 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 shaft transformation. Bearing device method; usually under the condition that the shaft rotation is mostly; thus the cooperation between the inner ring and the shaft is a win-win cooperation; the cooperation between the bearing outer ring and the bearing chamber is the cooperation of the gap.
4. After the bearing device is viewed, the bearing is disassembled. The disassembly of the bearing should be carried out with the same care as the device. Pay attention not to damage the bearing and each part; especially the dismantling of the interference cooperation bearing; the operation is difficult. Therefore; The stage should be considered for easy disassembly beforehand; it is also very important to design and disassemble according to the requirements. When dismantling, the method and sequence of disassembly according to the drawings are discussed; the cooperation conditions of the bearings are inquired; .
1. Unpacking the outer ring and disassembling the outer ring of the interference cooperation; beforehand, place several outer ring kneading screw screws on the circumference of the outer casing; tighten the screws equally on one side; while disassembling them, these screw holes are blindly closed. Plug; tapered roller bearing and other separate bearings; set a few cuts on the outer shoulder of the shell; use the block; use a press to open; or slam the open.
2. The inner ring of the cylindrical hole bearing is disassembled; it can be pulled out by the pressure machine. At this moment; pay attention to let the inner ring accept its pulling force.
The inner ring of the large bearing is disassembled and selected by the oil pressure method. The oil pressure is set on the shaft to make it easy to pull. The bearing with large width is used in combination with the drawing and clamping device;
The inner ring of NU type and NJ type cylindrical roller bearings can be disassembled by induction heating method. The part is heated in a short time; the inner ring is expanded and then pulled.
3. The taper hole bearing is disassembled and disassembled to be smaller than the compact sleeve bearing; the inner ring is supported by the block fastened on the shaft; the nut is turned back several times; the block is hit with a hammer to open and disassemble.
Large bearing; it is more and more simple to use oil pressure to disassemble; pressurize oil in the oil hole on the cone shaft; make the inner ring swell; remove the bearing. In operation; there is a bearing that can be pulled out; The nut is used as a block as well.
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