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[NACHI bearing]Angular contact ball bearings
  • [NACHI bearing]Angular contact ball bearings

[NACHI bearing]Angular contact ball bearings

[NACHI bearing]Angular contact ball bearings,This bearing ball with the inner and outer ring track contact with the relative diameter of a certain angle. Bearing can not be separated type. Because it is from the outer side of the countersink force into th
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[NACHI bearing]Angular contact ball bearings
● Balls and the inner ring and outer ring raceways are designed for contact in a specifi c contact angle, which means this type of bearing is suitable for composite loads (axial load and radial load).
● The contact angle means that axial force components are generated when a radial
load is applied, so these bearings are normally used in pairs at either end of a shaft.
● A contact angle of 15° is best for high speed, while a contact angle of 25° is better for axial loads.
Contact angle
The following table lists the standard angular contact ball bearings and characteristics.
Contact angle code Model example Contact angle
(α)
high speed Load capacity Remarks
Radial load
(X)
Axial load
(Y)
A
(无记号)
7205 30° ●● ●● ●● General application
B 7205B 40° ●●● Used when the axial load is high, such as ball screw support
C 7205C 15° ●●● ●●● Mostly P5 grade, used in high-speed spindle
● The more representative the better performance
Retainer

General grade angular contact ball cage retainer is the use of SPCC steel, the stamping of the way to create. However, when the bearing size is relatively large, not easy to stamping time, it will use copper alloy, the way to the production of turning.
Precision grade angular contact ball bearing retainer is made of phenolic resin or polyamide resin material.

Bearing accuracy

When not marked for the general accuracy, or as 0 level.
0 above are referred to as precision level, accuracy from low to high order of 0, 6, 5, 4, 2, when marked with P and P after the type and series. For example: 7206C P5
Angular contact ball bearings of the precision specifications, please refer to the technical information here.

Bearing life

Frequently asked question is: "How much power can this bearing withstand?"
Strictly speaking, the maximum force that a bearing can withstand without damage is equal to the "basic static load rating" in the specification table. But does not mean that can run for a long time!
Should be asked is, in the use of load and speed, the bearing can achieve the required life?
Bearing life can be calculated, but before calculating life expectancy, you need to know the speed and equivalent load. The so-called equivalent load is calculated when the bearing bear both radial load (Fr) and axial load (Fa), which is equivalent to pure radial load calculation load, usually expressed in Pr and Por. Please refer to the table at the top right of catalog for the calculation method of Pr and Por.
After you get the equivalent load (Pr) and the static equivalent load (Por), you can calculate the bearing life and safety factor. Calculation method, please refer to the technical information here.

Recommended tolerances

In order to play the performance of the bearing itself, the tolerance of the mandrel and the bearing seat hole is very important. Slipping may occur if there is insufficient interference with the mating surface.
Once skidding occurs, the mating surface will gradually wear and damage the mandrel and housing. In addition, abrasion powder may also penetrate inside the bearing leading to the occurrence of early damage.
Slipping can not be prevented by axial grasping only, and the wheel bearing the load must provide enough interference.
Deep Groove Ball Bearings with the general recommendations for tolerances, please refer to the technical information here.
 
Mandrel and chock suggested accuracy

Under normal conditions of use, the recommended accuracy of the spindle and bearing, please refer to the technical information here.
 
lubricating

General angular contact ball bearings for the open bearings, only the anti-rust oil, it must be used in its own time to provide lubricants.
Lubrication related recommendations, please refer to the technical information here.
 
Extreme speed

The speed limits listed in the catalog apply to the car holder, and in the case of the press holder, the speed limit is 80% of the catalog value. In addition, when the heavy load or axial load is relatively high, the limit speed must be multiplied by a correction factor.
For the method of correcting the speed limit, please refer to the technical data here.

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