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What is the "protrusion" of an angular contact ball beari

Writer: admin Time:2022-08-31 11:13 Browse:

Angular contact ball bearings are widely used in precision machine tools, high-speed motors, precision instruments and other high-precision mechanical equipment.
In angular contact ball bearings, there is often a slight difference in width between the inner rings. If the bearing is placed flat, it will be seen that the inner and outer rings cannot be completely level, and there will be a slight gap. When pressure is applied, the gap will disappear. , Is this a "problem" with the bearing, or is it "poor workmanship", or is it "buying a fake"?
This involves the "protrusion" in the angular contact ball bearing. Then, what is the "protrusion" and what is the function of the "protrusion"?


The protrusion of an angular contact ball bearing refers to the distance that the end face of the inner ring protrudes from the end face of the outer ring at the same end face of the bearing after preloading a single bearing.
 
The protrusion of angular contact ball bearings is an important parameter that affects the performance of the bearing. The measurement of the protrusion value is a necessary procedure in the assembly process, and special instruments are required for measurement.
 
So, do you know what is the role of the protrusion of angular contact ball bearings? How is it measured? The Kirin editor will summarize for you today, let’s take a look at it together.

As shown in the figure above, the protruding amount is also called the grinding amount, which is calculated according to a scientific method. When back-to-back, face-to-face or universal assembly is used, through installation and extrusion, the maximum value calculated at the time of product design is generated. Therefore, the bearing can maximize the design limit, which is convenient for users to use.
 
In machine tool spindle bearings, 0 and 2 series, and ball screw bearings, this "protrusion" design is the standard angular contact ball bearing design. Other types of bearings also have "protrusion" treatment, product suffix It is G/G(x)P(x), where G(x) can be GL (light, ie light preload), GN (normal, ie standard preload), GM (medium, ie medium preload), GH (high, that is, heavy preload), P(x) can be from P2-P6, representing the clearance value.

Since angular contact ball bearings are often used in high-speed and high-precision applications, bearing installation is very important.
 
Through the design of "protrusion" during bearing production, the trouble of installation can be minimized, so that even if customers do not know much about bearing installation, they can play the maximum function of angular contact ball bearings and ensure that they can play their due role. operation level.

Measuring method of protrusion of angular contact ball bearing
 
 
1. Pneumatic pressure measurement
​​
Most of the manufacturers who mass-produce assembled angular contact ball bearings use the pneumatic pressure measurement method. The measurement of the protrusion must go through the following basic steps:
​​
Turn on the air source, close the power supply, adjust each air circuit element according to the required working state, put the reference piece into the mandrel and enter the measuring position, apply the required load, and after adjusting the reference value of the measuring table, remove the reference piece.
 
Install the bearing under test into the mandrel, locate the reference end face of the outer ring, and apply the specified axial force (ie, the measurement load) to the lower end face of the inner ring. Measure the relative height difference between the non-reference end face of the inner ring and the reference end face of the outer ring, and measure the protruding value and the minimum value by rotating the main shaft.
 
2. Lever pressure measurement
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Manufacturers of small production or small assembled angular contact ball bearings mostly use the lever pressure measurement method, and the measurement of the protrusion must go through the following basic steps:
​​
Adjust the position of the counterweight according to the measurement load, put the reference piece into the mandrel and enter the measurement position, activate the lever to apply the required load, and after adjusting the reference value of the measuring table, remove the reference piece. Install the bearing to be tested into the mandrel, locate the reference end face of the outer ring, and apply the axial force of the vertical end face (that is, the measurement load) by the lever on the lower end face of the inner ring.
 
Measure the relative height difference between the non-reference end face of the inner ring and the reference end face of the outer ring, and measure the protruding value and the minimum value by rotating the mandrel. The measured bearing protrusion value shall be recorded according to the number for the bearing assembly.
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3. Substitute instrument measurement
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Occasionally, manufacturers of assembled angular contact ball bearings do not have measuring instruments. Substitute instruments are often used for measurement. When processing a larger tandem angular contact ball bearing, the instrument is used to measure the protrusion. The method is as follows:
 
Install the reference piece into the positioning mandrel of the instrument into the measurement position, adjust the measuring table so that the reference value pointer is 0, and remove the reference piece. Install the bearing to be tested into the positioning mandrel, locate the lower end face of the inner ring, apply the axial force of the vertical end face on the reference end face of the outer ring (that is, measure the load sleeve), and use the non-reference end face of the outer ring as the measuring point, and measure the convexity through the rotating mandrel Output value and small value. Measure the relative height difference f between the non-reference end of the inner ring and the reference end of the outer ring. The relative protrusion of the reference end of the inner ring to the non-reference end of the outer ring is δ=C+f-B. When using a substitute instrument to measure the bearing protrusion, the substitute instrument can be an improved end pendulum instrument or a height measuring instrument.

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