First, size constraints. Usually, the space where bearings can be installed is limited. In most cases, the shaft diameter (or bearing inner diameter) is limited by mechanical design or other design. Therefore, the selection of bearing type and size is determined according to the inner diameter of the bearing. Therefore, the main dimension tables of standard bearings are prepared according to the international standard inner diameter dimensions.
, Standard bearings are used in the design of mechanical devices This is designed to make bearings easy to purchase. Here’s a digression. Some imported bearing catalog models do have some, but some non-standard bearings are not available in Chinese mainland, and sometimes futures will be very long time.
we should consider the cost of time and late replacement, the load of bearings, the load exerted on bearings, and their properties. , size and direction are changeable. In general, the rated base load is shown on the dimension table.
However, axial load and radial load are also important factors in selecting suitable bearings. When the ball and needle roller bearings have the same size, needle roller bearings usually have high load capacity and bear large vibration and impact loads.
are determined according to the type, size, accuracy, cage type, load, lubrication mode, cooling mode and other factors of the bearing. The bearing table lists the allowable speed of standard precision bearings under oil lubrication and grease lubrication. Generally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation.
bearing dimensional accuracy and rotation accuracy are based on ISO and JIS standards. For machines requiring high precision and high-speed operation, it is recommended to use bearings with precision of grade 5 or above. Deep groove ball bearings, centripetal thrust ball bearings or cylindrical roller bearings are suitable for machines with high operation precision.
of the rolling element and raceway of the bearing is compressed, it will produce elastic deformation. Some machines need to minimize elastic deformation. Roller bearings produce less elastic deformation than ball bearings. In addition, in some cases, preloading is applied to the bearing to increase rigidity.
This procedure is usually used for deep groove ball bearings, centripetal thrust ball bearings and tapered roller bearings. Inner and outer ring offset, shaft bending, shaft or bearing housing tolerance change and matching error will lead to inner and outer ring eccentricity.
In order to prevent excessive eccentric angle, self-aligning ball bearing, self-aligning roller bearing, or self-aligning bearing seat are better choices. Voice frequency and torque, rolling bearings are manufactured according to high-precision standards, so voice and torque are small.
and cylindrical roller bearings are suitable for occasions with special requirements for low noise and low torque. Installation and disassembly. Some applications require frequent disassembly and installation to ensure regular inspection and maintenance.
Bearings with separate inner and outer rings, such as cylindrical bearing, needle roller bearing and conical bearing, are very suitable for this occasion. With the help of the shaft sleeve, the installation procedure of the taper hole self-aligning ball bearing and self-aligning roller bearing is also simplified.
The production characteristics of rolling bearing determine that its process has the following three characteristics:
In the processing of bearing parts, a large number of special bearing equipment are used. For example, ball grinding machine, grinder and other equipment are used for steel ball processing.
The characteristics of specialization are also reflected in the production of bearing parts, such as steel ball companies specializing in the production of steel balls, micro bearing factories specializing in the production of micro bearings, etc.