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First, how to choose the grease?
Lubrication INA bearing operation and life are extremely important to you an overview of the general principles of selection grease. Grease base oil, thickener and additives made of different types and different brands of the same type of grease performance varied widely, the rotation limit allowed, important to note that in the choice. The performance of the grease is mainly determined by base oil, typically a low-viscosity base oil suitable for the application of low temperature, high speed, high viscosity at high temperature, high load. Thickener also relates to the lubricating properties, the water resistance of the the water resistance decision grease thickeners. In principle, the different brands of grease can not be mixed, Moreover, even if the same kind of grease thickener, also with each other because of different additives adversely affect.
Bearing installation must be cleaned before it?
The bearing surface is coated with anti-rust oil, you must be carefully cleaned with clean gasoline or kerosene, and then coated with a clean, high-quality or high-speed high-temperature grease before installation. The cleanliness of the rolling bearing life and vibration noise is very large. In particular, we want to remind you: fully enclosed bearings should be cleaned refueling.
Third, how to install and disassemble?
Do not install the a direct hammering INA bearing end face and the non-stress surface, briquetting, sleeve or other installation tools (tooling) bearing even by force, not to body pass through the rolling power installation. If the mounting surface is greased, will install more smoothly. Fit interference larger bearing into the mineral oil heated to 80 ~ 90 ℃ installed as soon as possible after the strict control of the oil temperature does not exceed 100 ° C, to prevent tempering effect reduce the hardness and impact dimensions recovery. Demolition difficulties, it is recommended that you use the removal tool to pull out the carefully poured the hot oil on the inner ring, the heat causes the rolling bearing inner ring expansion, making it easier to fall off.
Mounting surface and installation site requirements?
Yes. If iron filings, burrs, dust and other foreign matter into the INA Bearing, will make bearings produce noise and vibration during operation and even damage the raceways and rolling elements. So, before installing the bearing, you must make sure that the mounting surface and installation environment clean.
Lubricated bearings, grease the better it?
Lubrication INA bearings, grease as possible, this is a common misconception. The bearings and bearing indoor excess grease will cause excessive oil stirring, resulting in extremely high temperatures. The number of rolling bearings filled with lubricant to fill the inside of the bearing space is preferably 1/2 to 1/3, the speed should be reduced to 1/3.
Bearing radial clearance smaller the better?
Not all of INA bearings require minimum working clearance according to the conditions, you must choose the appropriate clearance. GB 4604-93, the rolling bearing radial clearance is divided into five groups of Group 2, Group 0, Group 3, Group 4, Group 5, the clearance values followed by small to large, including 0 standard clearance. The basic radial clearance group applies to normal operating conditions, normal temperature and used interference fit; work under the special conditions of the high-temperature, high-speed, low-noise, low-friction rolling bearings are advised to use the large radial clearance; on precision spindle, the machine tool spindle bearings should be chosen smaller radial clearance; roller bearings can keep a small amount of clearance work. Separation-bearing clearance does not matter; Finally, the bearings installed after the clearance smaller than the original clearance before installation, because the bearings to bear the load rotation INA bearing fit and load The amount of elastic deformation.
Bearings after the end of the installation, in order to check whether the installation is correct, operated check. Small machinery can be rotated by hand to confirm whether or not to rotate smoothly. Nick, indentation inspection items dysfunctional due to poor installation, poor mount processing the torque generated by instability, the clearance is too small, the installation error, excessive seal friction torque and so on. If no abnormal power operation can begin.
Power operation, from the no-load low speed, slowly increased to the rated operation of the conditions set forth. Commissioning check matters, whether there are abnormal Sound, INA bearing temperature changes, the leakage of the lubricant, or discoloration, etc.. If abnormal, should immediately suspend the operation, inspection machinery necessary to remove the bearing checking.
Bearing temperature is generally speculated that according to the external temperature of the bearing. However, the use of the hole direct measurement of the bearing outer ring temperature is more accurate. Rolling temperature is gradually increased from the start of the operation, usually 1 to 2 hours after the temperature stabilized. If the bearing is installed adverse temperature will soar, and abnormally high temperatures. The reason for such lubricants too much, the INA bearing clearance is too small, poor installation, the sealing device too much friction, and so on.
INA bearings rotating sound check with a stethoscope, etc., there is a strong metal noise, abnormal sound, irregular sound described exception. The reason for poor lubrication, shaft or bad bearing accuracy, bearing damage, foreign invasion.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-386A/382A NTN | 47.625 | 96.838 | 21.946 |
| 4T-HM804846/HM804810 NTN | 47.625 | 95.25 | 29.37 |