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Sliding bearings developed on the basis of the rolling bearing, its working principle is based on rolling friction instead of sliding friction, generally consists of two rings, a set of rolling elements and a cage consisting of highly versatile, standardization, serialization degree of very high mechanical basic parts. Have different due to various mechanical working conditions, the load bearing capacity of the structure and performance etc. have put forward a variety of different requirements. To this end, the need for a wide range of structural bearings. However, the basic structure is composed of the inner ring, outer ring, rolling elements and cage formed.
For radial bearings, the inner ring is usually a tight fit with the shaft, together with the shaft running, usually bearing outer ring or mechanical shell holes into the transition fit, play supporting role. However, in some cases, there are outer functioning, role or act as bearing inner ring fixed to the inner ring, outer ring are running simultaneously. For thrust bearings, and shaft tight fit and movement axis of said ring together with the bearing or mechanical shell holes into the match and play the supporting role in the transition of said seat. Rolling elements (balls, rollers or needle) in the bearing retainer means generally arranged evenly between the two rings for the rolling motion, its shape, size and number of direct influence on the bearing load capacity and performance. In addition to rolling element cage can evenly spaced outside, but also from the guide roller rotation and improving internal bearing lubrication and so on.
Size constraints. Usually bearing can be installed where space is restricted. In most cases, the shaft (or bearing diameter) are according to the mechanical design or other design constraints. So bearing type and size is selected according to the bearing bore of the decision. Thus, the main dimension table bearing scales are based on international standard bore size prepared.
Scale size of the bearing form of numerous mechanical devices designed in the best use scales bearing (this bearing is designed to easily purchase, where you aside, some bearing the catalog model does have, but some non-standard bearings Mainland China is not the spot, sometimes futures will be very long time, so the bearing to be considered when selecting the time of the capital cost and late replacement) bearing load, the load applied to the bearing, the nature, size, orientation is changeable The. Typically, the basic load ratings are displayed on the size of the table. However, the axial load and radial load, etc., is also an important factor bearing choose. When the ball and needle bearing commensurate with the size, the needle roller bearings usually have a higher load capacity and withstand greater vibration and shock loading.
Speed, promised speed is calculated based bearing type, size, precision, cage type, load, lubrication, and cooling method and other factors. Bearing table lists the scale precision bearings lubricated in an oil and grease lubrication promised speed. Typically, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are used for high-speed operation of the occasion together.
Bearing tolerances, dimensional accuracy and precision rotation bearings according to ISO and JIS scale. For applications requiring high precision and high-speed operation of machinery, it is recommended to use five or more precision bearings, deep groove ball bearings, angular contact ball bearings or cylindrical roller bearings are fit for high precision mechanical operation. Rigid body and move when the bearing raceway contact surface pressure, will produce elastic deformation. Some machines require the elastic deformation to a minimum. Roller bearings than ball bearings produced by small elastic deformation.
In some cases, the bearing preload to be applied in order to increase rigidity. This procedure is commonly used deep groove ball bearings, angular contact ball bearings and tapered roller bearing inner ring bias, shaft bending, shaft or bearing housing tolerance variations, with errors cause eccentric inner and outer rings. To prevent the eccentric angle through large self-aligning ball bearing, self-aligning roller bearings, spherical bearing, or a better choice. Voice frequency and torque, move-scale production of high-precision bearings are manufactured in accordance with, so little voice and torque. Deep groove ball bearings, cylindrical roller bearings, and combined for a low voice, low-torque applications with special requirements.
Installation and removal, some applications often require the removal and installation to ensure that you can carry out their inspection and maintenance. Inner and outer rings of the bearing can be installed separately, such as: cylindrical bearings, needle roller bearings, and tapered bearings is combined in this occasion. Taper hole of self-aligning ball bearings and self-aligning roller bearings in helping the sleeve, the same simplifying the installation process.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7203B NSK | 17 | 40 | 12 |
| 7203A NSK | 17 | 40 | 12 |