The rotational speed of a full complement of roller bearings without an outer ring plays a key role in the bearing heating factor. Each model of a full complement of roller bearings without an outer ring has its own limit speed, which is determined by physical characteristics such as size, type and layout. , The limit speed refers to the very high working speed (usually r/min) of the full-roller bearing without an outer ring. Exceeding this limit will cause the temperature of the full-roller bearing without an outer ring to rise, the lubricant will dry up, and even make no outer ring The ring full roller bearing is stuck. The speed limitations required by the application help to determine what type of full complement of roller bearings without an outer ring to use. Most of the outer ring full roller bearing manufacturers' product catalogs provide the limit speed value of their products. It has been proved that it is relatively good to work under the condition of 90% lower than the limit speed. In terms of the speed requirements for full-roller bearings without outer ring, the following points are exaggerated: 1. Ball full-roller bearings without outer ring have higher limit speed and torsional accuracy than roller bearings with full-roller without outer ring. At high speed, ball full roller bearings without outer ring should be preferred. 2. Under the premise that the inner diameter is similar, the smaller the outer diameter, the smaller the rotating body will be, and the smaller the centrifugal inertia force added by the rotating body to the fan-shaped raceway during operation will be, so it is suitable for working at a higher speed. . Therefore, at high speed, it is advisable to use a full-roller bearing without an outer ring with a smaller outer diameter in the same diameter series. If a full-roller bearing without an outer ring with a smaller outer diameter is used and the load capacity cannot meet the requirements, a similar full-roller bearing without an outer-ring can be installed in parallel, or a wide-series full-roller bearing without an outer ring can be considered. bearing. 3. The material and layout of the cage have a great influence on the rotational speed of the full-roller bearing without an outer ring. The solid cage allows a slightly higher speed than the stamping cage, and the bronze solid cage allows a higher speed. In ordinary high-speed workplaces, deep groove ball full-roller bearings without outer ring, angular contact full-roller bearings without outer ring, and cylindrical roller full-roller bearings without outer ring should be used; in low-speed workplaces , Tapered roller full roller bearings without outer ring can be selected. The limit speed of tapered roller full roller bearing without outer ring is generally about 65% of that of deep groove ball full roller bearing without outer ring, 70% of cylindrical roller full roller bearing without outer ring, and angular contact ball without outer ring. 60% full circle of roller bearings. Thrust ball full roller bearing without outer ring has a low limit speed and can only be used in places with low speed.
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