Basic knowledge of bearing speed
wallpapers Products 2020-05-27
The bearing speed plays a crucial role in bearing heating factors. Each bearing model has its own limit speed, which is determined by physical characteristics such as size, type, and structure. The limit speed refers to the maximum working speed of the bearing ( Usually r / min). Exceeding this limit will cause the bearing temperature to rise, the lubricant will dry up, and even the bearing will be stuck.
The speed range required in the application occasion helps to determine what type of bearing to use. Most bearing manufacturers' product catalogs provide the limit speed value of their products. The practice has proved that it is better to work under the condition of a 90% lower limit speed.
See the requirements of the speed on the bearing, emphasizing the following points:
A. Ball bearings have a higher limit speed and rotation accuracy than roller bearings, so ball bearings should be preferred at high rates.
B. Under the condition of the same inner diameter, the smaller the outer diameter, the lower the rolling element, and the smaller the centrifugal inertial force applied by the rolling element to the international raceway during operation, so it is suitable for working at a higher speed. Therefore, at high rates, bearings with smaller outer diameters in the same diameter series should be used. If a bearing with a smaller outer diameter is used and the load-carrying capacity does not meet the requirements, the same bearing can be installed in parallel, or a full series of bearings can be considered.
C. The material and structure of the cage have a significant influence on the bearing speed. The robust enclosure allows a higher rotation speed than the stamping cage, and the solid bronze cage allows a more top rotation speed.
In general, higher speed working occasions, deep groove ball bearings, angular contact bearings, cylindrical roller bearings should be used;
Tapered roller bearings can be used in lower speed working situations.
The limit speed of tapered roller bearings is generally about 65% of deep groove ball bearings, 70% of cylindrical roller bearings, and 60% of angular contact ball bearings. Thrust ball bearings have a low limit speed and can only be used in smaller speed applications.