Deep groove ball bearings cannot bear heavy axial loads, so angular contact ball bearings (also known as thrust bearings) are mainly used as locating bearings in vertical motors. Whether single-row or double-row design, angular contact ball bearings have high axial load carrying capacity and speed performance. Ms. San will talk to you about vertical motor bearings today.
Angular contact ball bearing classification and use
Angular contact ball bearings are available in 7000C (∝=15°), 7000AC (∝=25°) and 7000B (∝=40°). This type of bearing generally has an inner and outer ring that cannot be separated and can withstand combined radial and axial loads as well as axial loads in one direction. The ability to withstand axial loads is determined by the contact angle. The larger the contact angle, the higher the ability to withstand axial loads. This type of bearing can limit the axial displacement of the shaft or housing in one direction.
Single-row angular contact ball bearings are mainly used in machine tool spindles, high-frequency motors, gas turbines, centrifugal separators, small car front wheels, differential pinion shafts, booster pumps, drilling platforms, food machinery, dividing heads, repair welding machines, low-noise cooling towers, electromechanical equipment, coating equipment, machine tool slot plates, arc welding machines, etc. The commonly used bearings for vertical motors are single-row angular contact ball bearings.
Single-row angular contact ball bearings for vertical motors
The bearings installed in vertical motors are related to the power and center height of the motor itself. Vertical motors H280 and below generally use deep groove ball bearings, while motors H315 and above use angular contact bearings. High-precision and high-speed bearings usually have a contact angle of 15 degrees. Under the action of axial force, the contact angle will increase.
When using angular contact ball bearings for vertical motors, they are generally installed at the non-extension end to ensure that the shaft extension end bearing can withstand radial force. However, there are strict directional requirements for the installation of angular contact ball bearings, which must ensure that the bearing can withstand downward axial force, that is, consistent with the gravity direction of the rotor.
Simply put, if the angular contact ball bearing is on the top, it is necessary to ensure that the bearing "hangs" the rotor; if the angular contact ball bearing is on the bottom, it is necessary to ensure that the bearing can "support" the rotor. However, under the premise of meeting the above functional requirements, the assembly process of the end cover must also be considered, that is, the external force during the assembly of the end cover must be consistent with the axial force that the bearing can withstand (the axial forces that the inner ring and outer ring of the angular contact ball bearing can withstand are in opposite directions), otherwise the bearing will be pushed apart.
According to the above rules, when the shaft of the vertical motor is facing upward, the angular contact bearing is installed at the non-shaft extension end, which not only meets the axial force but also ensures the assembly processability of the end cover; when the shaft of the vertical motor is facing downward, the angular contact bearing is also installed at the non-shaft extension end, but corresponding measures must be taken when assembling the end cover to ensure that the bearing is not damaged.
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