Generally, the space where Koyo 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 Koyo bearings are prepared according to the internal diameter dimensions of international standards. Scale Koyo bearings have various sizes and forms. Scale Koyo bearings are used in mechanical device design (this is designed to make KOYO bearings easy to purchase.
Here’s a digression. Some of the bearings catalog models do have some, but some non-standard bearings are not available in Chinese mainland, and sometimes futures will be very long time, so when bearing selection, we should consider the cost of time and the cost of later replacement). The nature, size and direction of the load of the bearing and the load applied to the bearing are variable. Generally, the rated basic load is shown in the size table. However, axial load and radial load are also important factors for selecting suitable Koyo bearings. When the size of ball and needle roller bearings is commensurate, needle roller bearings usually have high load capacity and bear large vibration and impact Load.
2. The speed and allowable speed are determined according to the type, size, accuracy, cage type, load, lubrication mode, cooling mode and other factors of the bearing. The scale accuracy is listed in the Koyo bearing table. The allowable speed of Koyo bearing under oil lubrication and grease lubrication. Generally, deep groove ball bearing, self-aligning ball bearing and cylindrical roller bearing are suitable for high-speed operation.
3. Koyo bearing tolerance, dimensional accuracy and rotation accuracy of Koyo bearing are based on ISO and JIS standards. For machinery requiring high accuracy and high-speed operation, it is recommended to use bearings with accuracy of grade 5 or above. Deep groove ball bearings, centripetal thrust ball bearings or cylindrical roller bearings are suitable for machinery with high operation accuracy. Rigidity will produce elasticity when the contact surface of the moving elastic body and raceway of the bearing is pressed 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, 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, dynamic bearings are manufactured according to high-precision standards, so voice and torque are small. Deep groove ball bearings and cylindrical roller bearings are used for occasions with special requirements for low noise and low torque.
5. Installation and disassembly. Some applications require frequent disassembly and installation to ensure that inspection and maintenance can be carried out according to their requirements. Koyo bearings with separate inner and outer rings, such as cylindrical bearings, needle roller bearings and conical bearings, are very suitable for this occasion. With the help of the shaft sleeve, the installation procedure of the taper hole type self-aligning ball bearing and self-aligning roller bearing is also simplified.
After the installation of Koyo bearing, in order to check whether the installation is correct, operation inspection shall be carried out. Small machinery can rotate by hand to confirm whether it rotates smoothly. The inspection items include poor operation caused by foreign matters, scars and indentation, uneven rotating torque caused by poor installation and poor processing of mounting base, large torque caused by too small clearance, installation error and sealing friction, etc. If there is no abnormality, power operation can be started. Since large machinery cannot rotate manually, turn off the power immediately after no-load start, conduct inertial operation, check whether there is vibration, sound, contact of rotating parts, etc., and enter the power operation after confirming that there is no abnormality.
Power operation starts from no-load low speed and slowly increases to the rated operation under the specified conditions. During the test run, the inspection items are whether there is abnormal sound, Koyo bearing temperature transfer, lubricant leakage and discoloration, etc. If any abnormality is found during the test run, stop the operation immediately, check the machinery, and remove the bearing for inspection if necessary. The temperature inspection of Koyo inlet bearing is generally inferred from the appearance of the shell.
However, it is more accurate to directly measure the temperature of the bearing outer ring by using the oil hole. The bearing temperature starts to rise gradually during operation. If there is no abnormality, it is usually stable after 1 ~ 2 hours. If the bearing temperature rises sharply due to poor bearing or installation, abnormal high temperature will occur. The reasons are too much lubricant, too small bearing clearance, poor installation, excessive friction of sealing device, etc. In the case of high-speed rotation, the wrong selection of bearing lubrication method is also the reason.