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Regardless of whether the working life, static load coefficient and economy meet the requirements, the size calculation must be carried out before the final selection of other sizes and structural forms of Koyo bearings. The calculation includes comparing the actual load of Koyo bearing with its load capacity. The static load of Koyo bearing refers to that the Koyo bearing is static after loading (there is no relative movement between the inner and outer rings) or the rotation speed is very low. In this case, calculate the coefficient of excessive plastic deformation of raceway and rolling element.
and the inner and outer rings move relative to each other. The early fatigue damage coefficient of raceway and rolling element is checked by dimensional calculation.Only in special cases can the nominal service life be calculated according to DIN ISO 281. For the design that pays attention to economic performance, we should make full use of the bearing capacity of Koyo bearing as much as possible. The more we want to make full use of Koyo bearings, the more important it is to calculate the accuracy of Koyo bearing size selection.
we should select whether SKF bearings meet our mechanical application range according to the size, specification and speed of SKF bearings. Here is a simple analysis:
First, size constraints. Generally, the space where SKF bearings can be installed is limited. In most cases, the shaft diameter (or SKF Bearing inner diameter) is limited by mechanical design or other design. Therefore, the selection of SKF Bearing type and size is determined according to the inner diameter of SKF Bearing. Therefore, the main dimension tables of standard SKF bearings are prepared according to the international standard inner diameter dimensions.
Standard SKF bearings are used in the design of mechanical devices (this is designed to make SKF bearings easy to purchase. Here’s a digression. Some SKF bearing catalog models do have some, but some non-standard SKF bearings are not available in Chinese mainland, and sometimes futures will be very long time. So when SKF bearing is selected, the cost of SKF and the load of SKF replacement should be considered. The load applied to SKF bearings will be very high. , its nature, 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 SKF bearings.
needle roller SKF bearings usually have high load capacity and bear large vibration and impact loads.Second, speed. The allowable speed is determined according to the type, size, accuracy, cage type, load, lubrication mode, cooling mode and other factors of SKF Bearing. The SKF Bearing table lists the allowable speed of standard precision SKF Bearing 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.
The dimensional accuracy and rotation accuracy of SKF Bearing are based on ISO and JIS standards. For machines requiring high precision and high-speed operation, it is recommended to use SKF 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. Rigid, when the contact surface of the rolling element and raceway of SKF Bearing is compressed, it will produce elastic deformation. Some machines need to minimize elastic deformation. Roller bearings produce less elastic deformation than ball bearings.
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, tolerance change of shaft or SKF Bearing housing, 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 SF 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. Deep groove ball bearings and cylindrical roller bearings are suitable for occasions with special requirements for low noise and low torque.