Selection of the bearing and the matters needing attention when using
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Type, type and size 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 analysis of many for research, evaluation, selection of bearing program from every point of view, there is no special specifications, but generally the order is as follows:
(1) mastering mechanical device and bearing conditions of use
(2) a clear requirement of the bearing
(3) the type for the selected bearing
(4) the selected configuration bearing
(5) select the size of bearing
(6) the selected bearing specifications
(7) selected bearing installation method
The bearing conditions of use and environmental conditions
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 get the following data and information:
(1) the structure and function of 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, Wen Sheng)
(7) the surrounding atmosphere (corrosion, cleaning, lubrication)
Distribution bearing selection
Usually, the 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 bear radial and axial load two, relative axial displacement between the fixed shaft and bearing box function. The other side is called the free side, only bear radial load, axial can move relatively, in order to solve the interval error caused by temperature change shaft extension problem and the installation of bearings.
For the fixed side bearing, select use the scroll surface in the axial direction (such as cylindrical roller bearing) or by the assembly surface (such as radial ball bearing) 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
When selecting the type of bearing, a comprehensive grasp of bearing conditions of use is crucial. The following table lists the main analysis project:
Analysis method of project selection
1) the installation space can accommodate to bearing bearing bearing type space due to the design of shafting on axial rigidity and strength, so the general first determine the shaft diameter, the diameter of 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 character [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, vibration or impact degree etc.. 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 bearing "angular contact ball bearings cylindrical roller bearing < < < self-aligning roller bearing tapered roller bearing
3) speed can meet the limit bearing type [bearing speed mechanical speed value reference speed, speed limit values contained in table bearing size] bearing not only on the bearing types is limited to the size of bearing, cage type, precision grade, He Run sliding mode load conditions, therefore, must be considered when choosing these factors. The 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] spindle, gas turbines and control machines respectively high rotation accuracy, high speed and low friction, then should use more than 5 grade precision bearings. Generally use the following bearing: deep groove ball bearings, ball bearings, cylindrical roller bearings
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 in the machine tool spindle and motor end, to improve the rigidity of shaft at the same time, must also increase the rigidity of the bearing. Roller bearing ball bearing small deformation than the load. Imposed on the bearing preload (clearance) can improve rigidity. The method is suitable for angular contact ball bearings and tapered roller bearings.
6) of the inner ring and outer ring of bearing tilted relative to the outer ring and the inner ring relative to the inclination of the production factors (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. 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 spherical) increment in the following order: cylindrical roller bearings, tapered roller bearings, deep groove ball bearings (angular contact ball bearing), spherical roller bearings (ball)
7) for installation and removal of regular inspection, assembly and disassembly method frequency frequent disassembly, cylindrical roller bearing inner ring and the outer ring can be separated, needle roller bearing, tapered roller bearing is more convenient. The conical hole self-aligning ball bearings and spherical roller bearings with tapered bore through the use of fasteners or withdrawal sleeve can be convenient for assembly and disassembly.
The selected bearing structure
Mechanical type are not the same, bearing the use conditions are different, the requirements are not the same, but generally speaking, bearing a shaft of not less than two.
Moreover, in order to facilitate the axial positioning, using mostly a bearing used as fixed end bearing, the rest is used as a self
234407BM 234706BM 234406BM 517/2860V/YA 5610/2500 517/1720X1V 527/1181M 510/1180M 517/930 510/670 590/560 510/500 52780 59080 517/368M 51760U 517/238 6207-2ZN 6206-2ZN 6205-2ZN 6204-2ZN 6203-RZ 6203-2ZN 6202N 6202-2ZN 6201-2ZN 6200ZZ 6200-2ZN 62/32-ZN 62/32-Z 62/32N 62/32-2Z 62/32-2RZ 62/32-2RS 62/28-2RZ 62/22-2RZ 61996 61992 61988 61984
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Bearing selection summaryType, type and size 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 analysis of many for research, evaluation, selection of bearing program from every point of view, there is no special specifications, but generally the order is as follows:
(1) mastering mechanical device and bearing conditions of use
(2) a clear requirement of the bearing
(3) the type for the selected bearing
(4) the selected configuration bearing
(5) select the size of bearing
(6) the selected bearing specifications
(7) selected bearing installation method
The bearing conditions of use and environmental conditions
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 get the following data and information:
(1) the structure and function of 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, Wen Sheng)
(7) the surrounding atmosphere (corrosion, cleaning, lubrication)
Distribution bearing selection
Usually, the 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 bear radial and axial load two, relative axial displacement between the fixed shaft and bearing box function. The other side is called the free side, only bear radial load, axial can move relatively, in order to solve the interval error caused by temperature change shaft extension problem and the installation of bearings.
For the fixed side bearing, select use the scroll surface in the axial direction (such as cylindrical roller bearing) or by the assembly surface (such as radial ball bearing) 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
When selecting the type of bearing, a comprehensive grasp of bearing conditions of use is crucial. The following table lists the main analysis project:
Analysis method of project selection
1) the installation space can accommodate to bearing bearing bearing type space due to the design of shafting on axial rigidity and strength, so the general first determine the shaft diameter, the diameter of 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 character [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, vibration or impact degree etc.. 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 bearing "angular contact ball bearings cylindrical roller bearing < < < self-aligning roller bearing tapered roller bearing
3) speed can meet the limit bearing type [bearing speed mechanical speed value reference speed, speed limit values contained in table bearing size] bearing not only on the bearing types is limited to the size of bearing, cage type, precision grade, He Run sliding mode load conditions, therefore, must be considered when choosing these factors. The 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] spindle, gas turbines and control machines respectively high rotation accuracy, high speed and low friction, then should use more than 5 grade precision bearings. Generally use the following bearing: deep groove ball bearings, ball bearings, cylindrical roller bearings
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 in the machine tool spindle and motor end, to improve the rigidity of shaft at the same time, must also increase the rigidity of the bearing. Roller bearing ball bearing small deformation than the load. Imposed on the bearing preload (clearance) can improve rigidity. The method is suitable for angular contact ball bearings and tapered roller bearings.
6) of the inner ring and outer ring of bearing tilted relative to the outer ring and the inner ring relative to the inclination of the production factors (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. 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 spherical) increment in the following order: cylindrical roller bearings, tapered roller bearings, deep groove ball bearings (angular contact ball bearing), spherical roller bearings (ball)
7) for installation and removal of regular inspection, assembly and disassembly method frequency frequent disassembly, cylindrical roller bearing inner ring and the outer ring can be separated, needle roller bearing, tapered roller bearing is more convenient. The conical hole self-aligning ball bearings and spherical roller bearings with tapered bore through the use of fasteners or withdrawal sleeve can be convenient for assembly and disassembly.
The selected bearing structure
Mechanical type are not the same, bearing the use conditions are different, the requirements are not the same, but generally speaking, bearing a shaft of not less than two.
Moreover, in order to facilitate the axial positioning, using mostly a bearing used as fixed end bearing, the rest is used as a self
