The full complement bearing.com/cylindrical-roller-bearings.html' target='_blank'>cylindrical roller bearings without outer ring manufactured by Changzhou Bearing, such as RSL series, CPM series, F-series, are mostly used in planetary reducer bearing gearboxes. Let's take a look at the installation and common problems of the reducer bearing: the reducer is a kind of rotating equipment, and the bearing plays a very important role when the equipment rotates. Therefore, when the reducer is in use, the installation and detection of the bearing are very important. . In the process of use, some common problems of reducer bearings are also related to everyone. Based on the knowledge of bearings, Zhongyu Bearing Network shares the standard installation of reducer bearings and some common problems below, hoping to help everyone. 1. Standard installation of reducer bearings (new bearing installation standards): 1. The new bearing should be calibrated for model, surface inspection, and radial clearance measurement should meet the requirements. After cleaning with kerosene, use mechanical oil to heat to 80~100 ℃, Hold at this temperature for 30 minutes. 2. When installing the bearing (the model should be facing the outside), tap the inner ring with a copper rod, close to the shaft shoulder, without clearance, and must not loosen. After the bearing is cooled, the bearing should be rotated flexibly by hand, and the cage works normally and rotates smoothly without impact sound. When assembling, pay close attention to the assembly sequence of each component to avoid wrong assembly or forgetting. 3. The limit value of the rotating bearing temperature: the rotating bearing rolling bearing is 80℃, and the sliding bearing is 65℃. Motor rolling bearings are 100°C. The sliding bearing is 80°C. 2. Maintenance steps of the reducer and bearing: (1) Prepare the required lifting tools, disassemble the relevant oil and water pipes, and seal them in time. (2) Remove the joint surface screws and end cover screws of the reducer, take out the stabilizer pins, and place them properly after cleaning. (3) Measure the pre-repair clearance of each part and record it. (4) Lift off the upper cover, lift out the gear, and place it at the designated place. (5) Clean and check bearings and gears with kerosene, measure bearing clearance, and check the wear of gears and bearing cages. (6) Release the oil in the box and clean it up. (7) When replacing the bearing, use a special scraper. When it is difficult to scrape and unload, the inner ring of the bearing can be heated by pouring hot oil at 120°C. It is strictly forbidden to heat it with acetylene flame. (8) Measure the dimensions of the journal and the inner ring of the new bearing, measure the clearance and record it. (9) Heat the bearing with oil and install it on the journal, and install the elastic retaining ring at the same time. (10) Re-measure the bearing clearance and record it. (11) Perform a hydraulic test on the cooling water drain inside the reducer and check for wear. (12) The hoisting gear is in place, and the large gear is rotated so that the large and small gears mesh normally and the center is aligned. (13) Hoist the upper cover of the reducer, measure the clearance at the top of the bearing, measure the axial clearance of each part, and adjust it appropriately. (14) Coat the joint surface with sealant, put on the positioning pin, and tighten the flange screws of the joint surface. (15) Assemble the end cap and adjust the cushion. (16) Connect oil, water pipes and valves. (17) Gearbox alignment. 3. Some common problems and faults of reducer bearings 1. Why do bearings have thrust clearance and expansion clearance? a Metal material has the property of thermal expansion and contraction, when the shaft works under different temperature conditions, the length and diameter of the shaft will also change. Therefore, in order to ensure that the thrust bearing forms a pressure oil film, a thrust clearance must be left. b In order to ensure that the shaft is not hindered or restricted to generate great stress during the expansion process, and damage the bearing, an expansion gap must be left. 2. How to measure the top clearance between the split bearing cap and the bearing by the lead wire method? a Place the lead wire on the joint surface of the bearing seat and the bearing cap close to the bolt hole and along the arc length of the top of the bearing. b Install the upper cover and tighten the bolts evenly diagonally. Remove the bearing cover and measure the thickness of each lead wire with an outer micrometer. c Subtract the average thickness of the lead wire at the outer ring of the bearing from the average thickness of the bearing seat joint plane, the difference is the positive value is the clearance, and the negative value is the tightening force. 3. What are the hazards of bearing oil level that is too low or too high? If the oil level is too high, it will increase the movement resistance of the oil ring and cause the oil ring to slip or stop. b If the oil level is too low, the balls or oil ring of the bearing will not be able to carry oil, resulting in the bearing not being lubricated, the temperature will rise, and the bearing will burn out. 4. What is the reason for the high temperature of the rotating machinery bearing? aLow oil level, lack of oil or no oil. b oil level is too high, too much oil. c The oil quality is unqualified or deteriorated (there are impurities in the oil). d Cooling water is insufficient or interrupted. e The oil ring does not carry oil or does not rotate. fThe bearing is defective or damaged. gThe device vibrates. 5. Look at the picture to analyze the failure factors of the reducer bearing? Figure 1 Figure 2 Figure 1 and 2 show the wear caused by improper adjustment of the radial clearance between the bearing chamber of the reducer casing and the outer ring of the bearing. The fit between the bearing and the bearing chamber. There is a clearance fit between the outer ring of the bearing and the bearing cover. If it is too tight, the radial clearance of the bearing will be too small due to the thermal expansion of the bearing during rotation. If it is too loose, the rotation accuracy will be reduced, and the rotation will be easy to jump. Therefore, there is generally a radial clearance of 0.05-0.10mm between the outer ring of the bearing and the bearing cover. At the same time, in order to ensure the free expansion and elongation of the rotating shaft after being heated, on the thrust and bearing sides of the bearing,There should be sufficient expansion clearance between the bearing and the end cover of the bearing chamber. The gap and value are related to the shaft length. Figure 3 Figure 4 Figure 3, 4 The cooperation of the bearing and the shaft. The inner ring of the bearing is tightly fitted with the shaft tail. If the interference value is too small, the inner ring will rotate, the friction with the shaft will cause vibration, and the bearing will be damaged due to temperature rise, and the shaft will be scrapped due to the wear of the bearing position. If the interference value is too large, the radial clearance of the bearing will be too small, causing the bearing to be stuck or damaged.
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