After smooth fat reasonable use to reduce vibration and temperature effects on NTN needle bearing

Ideal of life a lot of factors affecting the bearing, for example, temperature, vibration, etc. , these are all affect the elements of needle bearing, how ability to prevent the effects of these elements to the NTN bearing, mainly for everybody below introduce you the influence of vibration and temperature of bearing: one, bearing vibration NTN bearing vibration damage sensitive, such as peeling, indentation, rust, crack, wear and so on will be performance on bearing vibration measurement, therefore, a special needle roller bearing vibration is applied ( Frequency profiler, etc. ) The size of the measurement of vibration, frequency point cannot be inferred through unusual conditions. Measurement value due to the sensor bearing or used? 吗? Device location condition is different, and thus demand analysis and measurement of each machine in advance value must be the specification of the stop. Two, bearing temperature NTN bearing temperature, ordinary bearing on the surface of the outdoor temperature can infer that if can directly measure the temperature of the bearing outer ring, the analogy is appropriate. Usually conditions, the temperature of the needle roller bearing 1 - slow start up operations 2 hours to reach a steady state. About the heat capacity of the machine room temperature bearing, refrigerating capacity, speed and load changes. If the smooth, device corresponding department, NTN bearing is the temperature rise suddenly, there will be unusually high temperature, when stop, take the necessary preventive measures. Temperature sensor can monitor the working temperature of the use of NTN bearing, and completes the temperature value beyond the rules, to avoid the automatic alarm or stop burning shaft accident. The first is the smooth smooth bearing grease viscosity NTN bearing grease is usually make a similar viscosity or apparent viscosity, said in a clear smooth fat viscosity, must indicate the temperature and shear rate. Similar viscosity index can be used to control its activity at low temperature and pumping. Second is smooth bearing grease low temperature activity smooth weigh the NTN bearing grease performance at low temperature is one of the important index of low temperature torque, namely at low temperature ( - 20 ° c below) Smooth grease block needle bearing rotation of low-speed activity level, low temperature torque smooth fat by starting torque and rotation torque of the uniform value after 60 mm. The third is the bearing of the evaporative NTN bearing smooth smooth fat fat evaporation ( C) Said smooth fat during long-term use under condition of high temperature, smooth the fat level of volatile, evaporative as small as possible. The evaporative mainly depends on the nature of the smooth oil grease and fraction. Fourth is bearing smooth oxidation stability of lipid oxidation stability refers to the smooth fat in long-term storage or long-term high temperature using the function of resist heat and oxygen, sticking to its nature can not attack for change. Often due to oxidation, seizure free alkali content reduced or free organic acid content increases, drop point landing, dark appearance, present different smell, consistency, ultimate strength, viscosity similar to land, and destroy smooth lipid structure generated corrosive substances, form black oil separation. In smooth fat storage for a long time, therefore, should be sent there are dry and ventilated environment, avoid sun exposure, and shall regularly check free base or free change of the project such as organic acid, corrosion resistance, to ensure its quality and performance. Fifth, smooth bearing grease the thixotropy of smooth NTN bearing grease is the most fundamental characteristics of thixotropy. When applying an external force, in gradually become soft, smooth and fat activity apparent viscosity decreased, but when at rest, after a period of time ( A very short) Again, the consistency ( Restore) This feature is called thixotropy. Smooth fat this characteristic, the resolution can be at the site of the oil is not suitable for smooth smooth smooth, and show its good performance.