Analysis of the Causes of Bearing Clamping in Sliding Bearings

Rolling bearing manufacturer says analysis of the reason for sliding bearing holding the shaft

(1) There are impurities, dirt, and poor oil cleanliness in the lubricating oil and sliding bearing oil pool. When the oil ring rotates with the spindle, the oil supply system begins to operate. Impurities and dirt enter the space between the main shaft and the sliding bearing along with the lubricating oil, and the clearance between the main shaft and the sliding bearing is generally 0.03-0.04mm. When impurities and dirt stir the spindle or sliding bearing, it is likely that non liquid friction will occur, leading to shaft sticking.

(2) The lubrication system of the grinding head is faulty. Plain grinding sliding bearings are lubricated with oil rings. This lubrication method has the advantages of simplicity, automation, and low fuel consumption. There are 16 5mm holes evenly distributed on the circumference of the oil ring. When the oil ring rotates with the main shaft, the small hole on the oil ring splashes lubricating oil into the oil pool, which splashes onto the main shaft. The spiral oil groove on the main shaft transports lubricating oil between the two shafts. Spindle and sliding bearings. When the lubrication system of the grinding head does not supply oil or the oil supply is unstable, the phenomenon of shaft holding may occur.

The distribution of small holes on the surface of bearing ring forgings after turning. The metallographic structure has been oxidized and overburned, as shown in Figure 6. The main reason for this defect is that if the heating temperature of the bearing ring exceeds the upper limit specified by the process during forging, and the insulation time at this temperature is long, the material will end

Overall, due to the large total pressure bearing area of rolling bearings, their bearing capacity is generally higher than that of overturned bearings, and the function of overturned bearings to bear impact loads is not high. However, thoroughly liquid lubricated bearings can bear large impact loads due to the buffering and vibration absorption effects of lubricating floating oil. When the rotating speed is relatively high, the Centripetal force of the rolling element in the overturning bearing will expand, and its bearing capacity should be reduced (noise is easy to occur when the speed is fast). For gas pressure rolling bearings, their bearing capacity increases with the increase of the rotational speed ratio.