The high temperature adaptability of bearings and the cause of bearing overheating

The so-called high temperature bearings refer to the working temperature to be higher than the ordinary bearings to withstand the temperature, the general working temperature in 150 ° or more use of bearings called high temperature bearings. High-temperature bearings use features: 1, lifelong lubrication, in the use of the process without adding any grease. 2, cost-effective, quality than ordinary bearing quality tens of times. 3, with a long life cycle to win the trust of our customers. 4, high-temperature bearings are widely used in metallurgy, furnaces, glass, blast furnaces, spray painting equipment and other machinery under high-temperature operations. High-temperature bearings are mainly used in aviation jet engines, gas turbines, nuclear reactor systems, X-ray tube tungsten discs and high-speed aircraft, rockets, spacecraft.

High-temperature bearing installation bearing installation, must be in the sleeve end face of the circle around the equal pressure, for the sleeve into, strictly forbidden to use hammer and other (metal) heavy tool directly hit the bearing end face, in order to avoid damage to the bearing, in addition, if the sleeve of a party (such as the outer ring) pressure, and through the rolling body will be the other side of the sleeve (such as the inner ring) pressed into, which is often in the rolling face to cause indentation or This often causes indentations or abrasions on the rolling surface and should not be used, especially if the non-separated bearing is mounted on both the shaft and the bearing box. Bearings in the heater plus the installation process, must be aware of the temperature range of different high temperature bearings under the high temperature bearings.

High-temperature bearings with 1, the amount of interference will be rolling body of the inner ring and outer ring fixed in the shaft or bearing box, when it is subjected to load, so that the collar and shaft or bearing box with surface does not occur radial, axial and rotational direction of the relative movement, this relative movement will make with the surface of the friction, friction corrosion or friction cracks, etc., so as to cause bearing, shaft and bearing box damage, and then the friction powder mixed into the bearing internal, become a cause of poor operation, abnormal heating. This can lead to poor operation, abnormal heat generation and vibration. The best way to fix the bearing is to leave the interference between the collar and the shaft or the mating surface of the bearing box for a static fit, which can make the load of the thin-walled collar equally distributed on the circumference and does not affect the load capacity of the bearing. However, the use of static fit, in addition to the installation and removal of the bearing is not convenient, if the bearing is used to separate the bearing, can not move axially, so, and can not be used for all occasions.

2, with the choice with the selection of the general principle of the following, (1) according to the direction of the load acting on the bearing, the nature and which side of the inner and outer ring rotation, the load borne by the collar can be divided into rotating load, static load, or undirected load, bearing rotating load and undirected load collar should take static with (interference with), bearing static load collar, can take the transition with or dynamic with ( Clearance fit), bearing load or bearing vibration, shock load, the interference shall be increased, the use of hollow shaft, thin-walled bearing box or light alloy, plastic bearing box, must also increase the amount of interference. (2) requirements to maintain high rotational accuracy, shall use high precision bearings, and improve the size of the shaft and bearing box accuracy, to avoid excessive interference, if excessive interference, can make the bearing or shaft box geometry accuracy of the bearing collar geometry, thus damaging the bearing rotational accuracy, if non-separation type bearings (such as deep groove ball bearings) inside and outside the ring are used static fit, the bearing installation, disassembly is extremely inconvenient. It is best to use a dynamic fit on one side of the outer ring.

3, recommended with the installation of bearing shaft and bearing box shaft diameter, aperture size tolerance, in the metric system series, ISO283 (size tolerance and with) has the corresponding standard, therefore, with the tolerance has been selected with the shaft diameter, aperture size tolerance.