The following table lists the main analysis items:
Analysis Project Selection Method
1) The installation space can be accommodated in the bearing stiffness and strength of the bearing type shaft bearings installation space due to the focus on the design of the shaft axis, it is generally first determine the shaft, ie bearing diameter. But Rolling a variety of sizes and types of series, should choose the most suitable bearing type.
2) Load bearing load size, direction and nature of the [load bearing capacity with a basic load rating, said its value is contained in the bearing size table] bearing loads varied, such as the size of the load, if only radial load, axial load one-way or two-way, and so the degree of vibration or shock.
3) Speed can adapt the mechanical speed of the bearing type [bearing speed limit speed limit value represented by the benchmark, its value is contained in the bearing size table] bearing speed limit not only take on the bearing type has limited bearing size, cage type, accuracy class load condition and lubrication methods, therefore, must consider these factors while selecting. Most of these bearings for high-speed rotation: deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings.
4) having a truck mounted crane bearing type rotary precision desired rotational accuracy [dimensional accuracy and precision of the bearing rotation by bearing type has been standardized GB] spindle, gas turbines, and control of the machine requires high rotational accuracy, respectively, high speed and low friction, which should be used when more than five precision bearings. Generally use the following bearings: deep groove ball bearings, contact ball bearings, cylindrical roller bearings.
5) Just performance required to meet the mechanical rigidity of the bearing shaft type [when the bearing load, the contact portion of the rolling element and raceway will produce elastic deformation. "High rigidity" refers to the smaller amount of deformation of this elastic deformation] at the site of the machine spindle and the final stage of the deceleration devices, automobiles, to improve the rigidity of the shaft, it is also necessary to increase the rigidity of the bearing. Roller bearings under load deformation born smaller than ball bearings. Bearing preload (negative clearance) can improve rigidity.
This method is suitable for angular contact ball bearings and tapered roller bearings.
6) is inclined relative to the inner ring and outer ring of the bearing inner ring and the outer ring analysis produce relatively tilted factors (such as poor accuracy or the mounting error of the deflection, caused by the load of the shaft and the housing axis) and can adapt to this selection Conditions of bearing types. If the inner and outer rings relative inclination is too large, the bearing load due to internal damage produced.
Therefore, the bearings should be selected to withstand this type of tilt. In general, allows the tilt angle (or aligning angle) increments in the following order: plane bearing cylindrical roller bearings, needle roller bearings, deep groove ball bearings (angular contact ball bearings), self-aligning roller (ball) bearings.
7) The installation and removal of detachable regular inspection frequency and frequent assembly and disassembly disassembly methods using separable inner and outer rings of cylindrical roller bearings, needle roller bearings and tapered roller bearings is more convenient. Tapered bore spherical ball bearings and tapered bore spherical roller bearings through the use of fasteners or withdrawal sleeves can be easy assembly and disassembly.
After considering these factors, again select the most suitable bearing type. In general, the radial load crossed roller bearings capacity of the same inner diameter increments in the following order: deep groove ball bearings <angular contact ball bearings <cylindrical roller
没有评论:
发表评论