The importance of thrust ball bearing installation to work



FANADEBearing

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Jan 6, 2014
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Bearing grease is usually make a similar viscosity or apparent viscosity, said when, on the viscosity of grease must specify the temperature and shear rate. Similar viscosity index can be used to control the low temperature fluidity and pumping.
Measure thrust ball bearing grease performance at low temperature is one of the important index of low temperature torque, namely at low temperature (20 ° c below) - grease block bearing rotational degree of low speed flows, the low temperature torque of the grease by the starting torque and rotation torque after 60 mm average said.Bearing use affect the life of the common problems in the assembly
The evaporative (c) bearing grease said in long-term use under condition of high temperature grease, grease oil volatilization, evaporative as small as possible. The evaporative mainly depends on the nature of the lubricating oil and fat fractions.
Oxidation stability is refers to the grease when used in long-term storage or long-term high temperature resistance to heat and oxygen, permanent changes in their ability to maintain its nature will not occur. Due to oxidation, are often free alkali content reduced or free organic acid content increases, drop point drop, dark appearance, appear different smell, consistency, ultimate strength, similar viscosity decreased, generated corrosive product and destroy the material of grease, soap oil separation. In long-term storage of grease, therefore, should be stored in dry and ventilated environment, prevent sun, and shall regularly check free base or free change of the project such as organic acid, corrosion resistance, to ensure its quality and performance.
A, installed on the surface and workplace requirements
If INA bearings with iron filings, burr, dust and other foreign matter to enter, will make the thrust ball bearing noise and vibration during operation, and even damage raceway and rolling body. So, before the installation of bearings, you must ensure that the installation surface and the environment clean.
Second, the bearings must be cleaned before installed
Bearing surface coated with anti-rust oil, you must use clean petrol or kerosene cleaning carefully, then coated with clean, high quality or high speed high temperature lubricating grease before installation. Cleanliness of bearing life and the influence of vibration noise is very big. But we especially want to remind you is: fully enclosed bearing not clean fuel.
Third, the choice of the grease
Lubrication of INA bearings work and life have very important influence, this to you a brief introduction to the general principles of the grease choice. Grease made out of base oil, thickener and additive, different types and different type of same kind grease properties vary widely, allowing the rotation of the limit, when the choice is important to note. The performance of the grease is mainly composed of base oil, the basis of generally low viscosity oil is suitable for low temperature, high speed, high viscosity is suitable for high temperature, high load. Thickener and relationship with lubrication performance, thickening agent, water resistance to the water resistance of the grease. In principle, different brand of grease can't mix, and even the same thickening agent of grease, will also bring bad influence each other on the basis of different additives.
Fourth, add oil
Lubricated bearing, oil paint, the more the better, this is a common mistake. Bearing and bearing indoor excessive grease will cause excessive oil mixing, resulting in a high temperature. Thrust ball bearing lubricant filling quantity to full of bearing internal space 1/2 ~ 1/3 advisable, high speed should be reduced to one-third.
According to the area of use and conditions of use and environmental conditions choose size, precision, with appropriate INA bearings self-aligning ball bearing life and reliability is the premise.
Area of use: apply to carry to mainly consisting of radial load and axial union load, usually with two sets of bearing pair is used, should be mainly in car wheel hub, before and after active transmission parts, such as bevel gear, differential, reducer.
Bearing running clearance in slightly negative, INA bearing life is the largest. But actually should keep bearing the best condition is very difficult, once some using conditions change, the negative clearance increases, resulting in a significant reduction in the thrust ball bearing life or fever. Therefore, often requires choosing initial clearance, running clearance off for only a slightly greater than zero.