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The ultimate speed of a bearing depends on the type of bearing
发布时间:2021-09-11浏览次数:0

The speed of the bearing is mainly limited by the temperature rise caused by the friction heating inside the bearing. When the speed exceeds a certain limit, the bearing will not continue to rotate because of burns and so on. The limit speed of bearings refers to the limit value that does not produce friction heating that causes burns and can be continuously rotated.




Therefore, the ultimate speed of the bearing depends on the type, size and accuracy of the bearing, as well as the lubrication mode, the quality and quantity of lubricant, the material and type of the cage, load conditions and other factors. The ultimate speed of each type of bearing with grease lubrication and oil lubrication (oil bath lubrication) is shown in the bearing size table respectively, and its value represents the limit value of the speed of the standard design bearing under the general load condition (C/P>=13,Fa/Fr<=0.25 or so). In addition, lubricants depending on their type and brand may be superior to other properties but not suitable for high speed rotation.


When the modified load condition C/P of the ultimate speed is <13 (that is, the equivalent dynamic load P exceeds about 8% of the basic rated dynamic load C), or the axial load in the combined load exceeds 25% of the radial load, the formula below shall be used to correct the ultimate speed. Where na: modified ultimate speed, RPM f1: modified coefficient related to load conditions F2: modified coefficient related to composite load N: ultimate speed under general load, RPM (refer to bearing size table) C: basic rated dynamic load, n {KGF} P: Equivalent dynamic load, N{KGF} Fr: radial load, N{KGF} Fa: axial load, N{KGF} ultimate speed of ball bearings with sealing rings Contact ring (RS type) the ultimate speed of ball bearings is limited by the linear speed of the contact surface of the sealing ring, the allowable linear speed depends on the rubber material of the sealing ring.


Bearing in high speed rotation, especially when the speed is close to or above the limit speed recorded in the size table, the following matters should be paid attention to:


(1) Use precision bearings


(2) Analysis of bearing internal clearance (considering the reduction of bearing internal clearance caused by temperature rise)


(3) Analysis of the type of cage material (for high-speed rotation, suitable for the use of copper alloy or phenolic resin cutting cage. There are also synthetic resin shaped retainers for high speed rotation.)


(4) Analyze the friction coefficient of the bearing (reference) by means of lubrication methods (such as cyclic lubrication, jet lubrication, oil mist lubrication and oil-gas lubrication suitable for high-speed rotation). In order to facilitate comparison with the sliding bearing, the friction torque of the rolling bearing can be calculated according to the bearing inner diameter by the following formula: M=uPd/2 here M: M {KGF. Mm} u: friction coefficient, bearing load, N{KGF} D: bearing nominal inner diameter, mm friction coefficient u is greatly affected by bearing type, bearing load, speed, lubrication mode and so on.


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