With the purpose of lubrication way - bearing knowledge

For bearing lubrication is one of the important important problems about its performance. Lubricant or lubrication method appropriate or not will greatly affect the service life of bearing. The role of lubrication is as follows: 1) Lubricated bearing parts, reduce the channel and the steel ball of the rotary friction, sliding friction of ball and retainer, retainer and sliding friction within the channel guide surface (2) Take internal friction bearing internal heat and other heat coming from the outside, to prevent the bearing of fever and lubricant degradation of 3) Make the bearing rolling contact surface often form appropriate oil film, ease the impact load stress concentration and prolong bearing fatigue life of 4) Prevent corrosion of steel ball, the channel, keep and garbage, the invasion of the foreign body, moisture, rust and dust bearing lubrication of the bearing way consists of grease lubrication and oil lubrication, its general is as follows: project fat oil seal device simple complicated, need to pay attention to maintain good lubrication performance is very good speed - medium speed can also be used for high torque at low speed is larger smaller lubricant is more trouble on the replacement of the simple life of lubricant shorter length has no good cooling effect ( Need to loop) Impurities filter difficult easy leakage of lubricant oil spill pollution does not apply to forbid to less grease lubrication grease lubrication oil leakage places can do a grease filling after long time do not need to supplement, and the structure of the sealing device is also relatively simple, so widely used. Grease lubrication of filling grease in the seal type bearing in advance sealing way, and in the shell internal filling amount of grease, every once in a while to supplement or replace the packing way for fat. Moreover, there are many bearings need lubricating machinery, also USES the pipe connection to the lubrication for lipid concentrate way. 1) Grease filling of the shell grease filling amount along with the structure and the volume of the shell is different, the general should be 1/3-1/2 of the filling to volume. Filling quantity too much, because of mixing heating grease occur metamorphism, aging and softening, should pay attention. But when used in low-speed bearing, to prevent foreign invasion, sometimes pack to two-thirds of volume 1. 2) The complement of the grease with replacing the supplement and replacement of the grease lubrication way has a close relationship, no matter adopt what kind of way, must use clean and grease, and pay attention to the invasion of the external foreign body. Add grease should be the day for the same brand grease. When adding grease, is particularly important should guarantee the new grease into the bearing internal indeed. Lubrication oil lubrication is suitable for high speed bearings and to a certain degree of high temperature resistant, but also to reduce the vibration and reduce noise effectively, mostly used for grease lubrication is not applicable to occasions. Lubrication can be divided into: ( 1) Oil bath lubrication ( 2) Oil drip lubrication ( 3) Splash lubrication ( 4) Circulation lubrication ( 5) Spray lubrication ( 6) Oil mist lubrication ( 7) Oil and gas standard lubricant grease lubrication is composed of base oil, tackifier, additives of semi solid lubricant, must according to its combination of choosing appropriate to use the grease. ( 1) Base oil grease base oil is most commonly used mineral oil, but in order to improve the heat resistance, low temperature fluidity, so also the use of silicone oil and synthetic oil. ( 2) Tackifier tackifier has all kinds of compound, etc. , is to control the mechanical stability, water resistance, use temperature scope and features of things. ( 3) Additive according to use purpose, combined with various additives. Extreme pressure additive, make up impact load and heavy load characteristics. · oxide additives to prevent long time no oxidation degradation of supplement. Antirust additive to prevent rusting and around the bearings. ( 4) Oil viscosity said the degree of hardness, 5 seconds is pouring oil depth (weight of metal cone With 0. 1 mm) Quantities, the greater the value the more soft. ( 5) After dropping point oil heating into a flow state, starting from the specified hole under the temperature of the call drops, its value, the higher the temperature. ( 6) Heterogeneous viscosifier and additive mix of grease, oil change, the nature of reason, in principle, different kinds of oil had better avoid to mix. ( 7) Oil seal in quantity ( 8) The life of the oil ( 9) Oil added clearance even if use high quality oil, but because of the long-term use of and the surrounding environment, the performance of the oil degradation, lubrication poor performance, so need to have a fat supplement and timely replacement. The operating temperature of 1 year in about 50 ℃, more than 100 ℃ even with good heat resistance the best 1 2 ~ 3 times of exchange. There is no specified standard lubricant is as follows: oil brand lubricating oil use basic types of work temperature range of Chevron (CVX SRI - Fat - 2 minerals 30 ~ 180 high temperature resistance, resistance to water Shell, Shell Alvania fat - 2 minerals 35 ~ 120 long life, wide application Shell Shell Doliun oil fat - R 40 ~ 150 corrosion resistance, resistance to water synergy Kyodo Yoshi SRL synthetic fat - 40 ~ 150 low noise, low torque Mobil Mobil HP lithium chromium synthetic fat - 30 ~ 110 vibration resistance, corrosion resistance of Dupont Dupont Krytox240AC fat - fluoride 35-290 high temperature resistant, good features esso Exxon Beacon synthetic fat - 325 55 ~ 120 general grease