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Type, type and size selection and use matters needing attention of rolling bearing when the selected summary of rolling bearing is varied. In order to make mechanical device to play the expected performance, bearing the most appropriate choice is essential. For the selected bearing, need to analyze many for research, evaluation, concerning the selection of bearing program from every point of view, there is no special specifications, but in general the following order:
(1) mastering mechanical device and bearing conditions of use.
(2) clear bearing on the request
(3) the type selected bearing
(4) the selected bearing configuration
(5) selection of bearing size
(6) the selected bearing specifications
(7) selected bearing installation method
Bearing conditions of use and environmental conditions to correctly grasp the bearing is precondition to select suitable bearing in the use position mechanism and conditions of use and environmental conditions. For, need to obtain the following several aspects of the data and information:
(1) the function and structure of the mechanical device
(2) the use of parts of the bearing
(3) bearing load (size, direction)
(4) rotating speed
(5) the vibration, impact
(6) bearing temperature (ambient temperature, temperature rise)
(7) the surrounding atmosphere (corrosion, cleaning, lubrication) bearing configuration option usually, shaft is supported in the radial and axial taking two bearing, at this time, the side of the bearing is called fixed side bearing, it can bear radial and axial load two, the relative axial displacement between the fixed shaft the role and the bearing box. The other side is called the free side, only bear radial load, axial and can move relatively, so as to solve interval error caused by the temperature change of the shaft extension part and the installation of bearings. For the fixed side bearing, need to choose available on the rolling surface axial movement (such as cylindrical roller bearing) or by fitting surface mobile (such as radial ball bearings) bearing. In the short axis of the fixed side and free side, no other cases, using bearings only one-way fixed axial movement (such as radial thrust ball bearing). Selection of bearing type selection of bearing type, fully grasp the bearing conditions of use is crucial. Listed in the following table analysis of the project mainly: selection method of analysis of the project
1) the installation space bearings can accommodate to bearing installation bearing type space due to the design of shafting by focusing on the axial rigidity and strength, so the general first determine the shaft diameter, the inner diameter of the bearing. But in a variety of sizes and types of rolling bearings, should choose the most appropriate type of bearing.
2) load capacity load bearing load magnitude, direction and nature [bearing with basic load ratings, its value is contained in table bearing size bearing load variations, such as whether the size of the load, only the radial load, axial load is a one-way or two-way, the degree of vibration or shock. After considering these factors, and then to select the most appropriate type of bearing. In general, the radial load bearing capacity of the same diameter increment in the following order: deep groove ball bearings, angular contact ball bearings < < cylindrical roller bearings, self-aligning roller bearing tapered roller bearing < <
3) speed can meet the bearing type bearing speed mechanical speed limit standard limit speed, speed limit values contained in table bearing size] bearing not only depends on the type of bearing is limited to the size of bearing, cage type, precision grade, loading conditions and lubricating mode, therefore, when the choice must be consider these factors. The following bearings are mostly used in high speed rotation: deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings
4) size and rotation precision rotary precision bearing type bearing rotation accuracy is required by GB on a bearing type standardized] machine tool spindle, gas turbines and control machines respectively high rotation accuracy, high speed and low friction, then should use bearing precision grade 5 above. The general use of the following: deep groove ball bearings, bearing contact ball bearing, cylindrical roller bearing
5) rigidity needed to satisfy the mechanical shaft rigid bearing type bearing load, roller and raceway contact part can generate elastic deformation. "High rigidity" refers to the elastic deformation smaller] reduction device and other parts of the machine tool spindle and motor stage, to improve the rigidity of shaft at the same time, must also increase the rigidity of the bearing. Roller bearing ball bearing small deformation load than the. The bearing applied preload (negative clearance) can improve rigidity. This method is suitable for ball bearings and tapered roller bearings in angular contact.
6) the inner and outer rings tilted relative to the inner ring and outer ring of bearing factors relative to the inclination (such as deflection, load caused by the shaft and housing poor accuracy or installation error), and the selection of bearing types can adapt to the conditions of use of the. If the inner and outer rings relative tilt is too large, bearing damage due to an internal load. So we should choose bearings can withstand this tilt type. In general, allow the tilt angle (or angle) increment in the following order: cylindrical roller bearings, tapered roller bearings, deep groove ball bearings (angular contact ball bearing), spherical roller bearings (ball)
7) installation and dismantling of regular inspection, assembly and disassembly method of assembly and disassembly frequently, cylindrical roller bearing inner ring and the outer ring can be separated using the tapered roller bearings, needle roller bearings and more convenient. Self-aligning ball bearings with tapered bore and a conical hole self-aligning roller bearing by using fasteners or withdrawal sleeve can be easy to dismantle.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7903CDB NSK | 17 | 30 | 7 |
| 7903A5DB NSK | 17 | 30 | 7 |