When you query the bearing model, we often see the two options of CR and COR. What do these two sets of letters represent? CR refers to the bearing rated load, and COR refers to the bearing rated static load. So what is the bearing rated static load and rated dynamic load? What are the differences and differences between the two? Share as follows:
The three basic parameters often used in rolling bearing in the design are: the basic fixed -rate load CR (radial) or CA (axial direction) that meets the requirements of a certain fatigue life; Orientation of) or COA (axial direction) and the limit speed NO of the bearing wear.
What is the bearing rated static load?
Basic rated static load (radial COR, axial COA) of the basic rated static load of rolling bearing refers to a comparison with the diameter load or central axis static load when the maximum load roller and roller contact center causes contact stress at the center of the roller.
The rated static load is determined under the hypothetical load conditions. For the directional bearing, the rated static load refers to the radial load. The radial component, the thrust bearing refers to the central axial load.
That is to say, the radial rated load and axial basis of the axial basis of the bearing of the bearing of the bearing of the bearing.
The bearing capacity of deep groove ball bearings when static or slow rotation (speed N ≤ 10R/min) is the rated static load.
What is a bearing rated dynamic load?
The bearing rated load refers to the theoretical constant radial load (constant axial load) that the rolling bearings can theoretically bear. The basic rated life of the load is 100W. Ability. Basic fixed -rate loads of the PC and thrust bearing are referred to as radioprotic radical dynamic load and axial basic fixed -rate load, which is represented by CR and CA.
The bearing capacity of the ditch bearing when rotating (speed n> 10r/mim) is the basic fixed -rate load.
Why is the bearing rated load greater than the rated static load?
The rated dynamic load refers to the load that the bearings bear when the rated life is 1 million. The rated static load refers to the sum of the rolling band with the largest load and the rolling road in the rolling lane under this load. Essence
The service life of the bearing has a certain relationship with the bearing rated load. How can we choose the bearing through the bearing rated load by the bearing rated load? There are mainly the following points:
Note: In some cases, the size of the bearings should be selected by the rated static load (for convenient description, defining codes of CO), rather than calculating the bearings of the bearings.
1. Under the action of continuous or intermittent impact load, bearings are still.
2. Under the action of load, the bearings are only slowly swinging or regulating exercises.
3. Under the action of load, the speed of the bearing is very low (less than 10 rpm per minute) and only a short life. In particular, in this case, for a given equivalent load P, the basic rated fixed -rate load C, which is very low according to the life formula, is obtained, so the selected bearing may be severely overloaded in actual work.
4. In addition to the normal working load, we must also bear a heavy impact load. Bearing is rotated.
In various cases above, the load that the bearing can withstand does not depend on the fatigue of the material, but depends on the degree of permanent deformation caused by the load on the load.