With three good points of the rolling bearing
Replacement 1. Rolling
1. Replacement Principles
Rolling there is such a feature: the same type of bearing diameter are the same, along with the series of increasing diameter, outer diameter and width also increase, bearing dynamic load rating and static load rating also rise; the outer diameter of the same size With the increasing diameter of the series, but with the smaller inner diameter, width corresponding increase, bearing dynamic load rating and overdetermined static load will also increase accordingly. Of the same diameter, outside diameter and width can find a variety of different bearing; and for the same diameter, but also find a variety of inner diameter and width of the bearing. For the same inner and outer diameters of the bearing can also be found in different widths, which for Replacement Rolling foundation, provided for convenience.
According to the characteristics of this size and use practices of rolling bearings, bearing when selecting alternative, should follow the following principles:
1. Isolated original use of bearings bearing data based on dynamic load rating C values ??and static load rating C0 value, and the original use of the bearing according to the aforementioned bearing life calculation formula and prepare alternative computing life and carrying capacity of bearing comparison. It must be noted, bearing life and bearing dynamic load rating 3 (ball bearings) C values ??or 10/3 (roller bearings) increasing power of a relationship, but the dynamic load rating C value is not measured by the size of the bearing life The only criterion, as found by the alternative bearing dynamic load rating C value than the original use bearing hour, you should consider a host of other technical features and increased number of bearing maintenance and economic cost, or take appropriate and effective measures from the lubrication point of view to extend the actual life of bearings to meet the alternative of rationality.
2. Replacement of the bearings allow the speed limit should be equal to or higher than the first wife bearing the actual speed when working in machinery and equipment per minute. Because higher bearing speed, the centrifugal force of the rolling body the greater, so that not only increases the bearing load, and the unit increased frequency axis endurance, easy to make material fatigue, reduced bearing life, so alternative bearing speed limit should be selected get higher.
3. Replacement bearing size to be with wife bearing the same size, can not be changed and the bearing outer rings with the housing aperture size, or the size of the bearing inner ring with the journal for future buy original bearing, you can re-install the original equipment bearings .
4. Replacement of the bearing clearance to be consistent with the original bearing clearance.
5. Replacement bearing tolerance level should be equal to or higher than the first wife bearing, avoid the installation of mechanical equipment precision affected.
6. When using casement bearing alternative method, to ensure that the inner and outer cylinder and the coaxial sleeve, and should set the right choice when machining tolerances.
When substituted for domestic bearings imported bearings, first of all from the actual site of the original equipment materials or devices to understand the code, manufacturers and technical characteristics of the bearing bearings used abroad, followed by further alternative work, and to pay attention to:
? Depending on the size of the foreign bearing the original equipment used in the specifications, type, and manufacturer's basic code, find the corresponding bearing can substitute the basic series and code from abroad bearing model control manual, and check the installation size bearings in particular double row, four-row tapered roller bearings and (single) tapered roller bearings, angular contact ball bearings in pairs after assembly assembly width (or height) and bearing the actual use are the same.
? understand the technical characteristics of the bearing. Technical characteristics of the bearing are generally bearing designator code represent the front or rear, front-code representation and the corresponding technical meaning of each bearing factories are not the same, but no matter which one bearing factory, as a bearing Only one code, and bearing a basic code before and after the match-code can only express a technical characteristics, thus making a regular basis at home and abroad bearing Replacement figure bearing factory or company name, and then find the relevant information in Pre and post code bearing code of technical meaning, to understand the structure or technical characteristics of the original bearings.
