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The contact state of the base surface of the bearing ball and the rib and the existing problems

wallpapers News 2021-02-22
When designing tapered roller bearings, the contact state between the bottom surface of the bearing roller ball and the ribs and the existing problems will affect the service life of the bearing. Next, we analyze the problem and contact state between the bottom surface of the bearing ball and the large rib.
 
1. There is a problem with the contact between the bottom surface of the tapered roller ball and the large rib
In a tapered roller bearing with a large taper angle, the three surfaces of the inner ring raceway, the outer ring raceway and the outer diameter of the rollers mainly bear radial loads and are theoretically in a pure rolling state. The bearing capacity of this kind of bearing is higher than that of ordinary tapered roller bearings. It is mainly used to bear combined radial and axial loads, and axial load is the main direction.
 
The design and processing methods of the traditional tapered roller ball base surface cannot meet the service life requirements of tapered roller bearings. The main problems and current situation are:
 
(1) The large rib surface of the inner ring and the bottom surface of the ball wear unevenly, and the SR value of the bottom surface of the ball has a large dispersion;
(2) Abnormal temperature rise often occurs during bearing use;
(3) The contact position between the bottom surface of the large cone angle tapered roller ball and the large rib of the inner ring is abnormal, and sometimes there is a contact position between the outer surface of the large rib of the inner ring and the large rib of the inner ring. The edge of the bearing. The hole diameter of the bottom surface of the ball sometimes appears between the inner side of the annular rib and the radially chamfered edge of the bottom surface of the ball, that is, the contact position between the bottom surface of the ball. The large ribs in the inner ring often appear unstable;
(4) The large rib of the inner ring of the bearing sometimes cracks. Therefore, in order to effectively improve the service life of such a large cone angle tapered roller bearing, the problem of the influence of the shape of the bottom surface of the ball on the performance of the bearing must be solved first.
2. Analysis of the contact state between the bottom surface of the tapered roller ball and the large rib of the inner ring
The bottom surface of the ball and the large rib of the inner ring are both working surfaces. When the lubrication is poor or the contact position is unreasonable, the sliding friction generated during the working process will cause serious friction and wear, burns or stress concentration, which will lead to the early fatigue of the bearing raceway, the bottom surface of the ball and the bearing. The outer diameter peeled off and failed. The shape of the bottom surface of the tapered roller ball, the size of the bottom cavity diameter and the shape of the large inner ring rib are the main factors that affect the abnormal temperature rise of the inner ring large ring, and the load capacity. The contact position between the large bottom surface of the tapered roller and the inner ring rib is also a very important link.
 
The abnormal contact position and wear condition between the large rib of the inner ring and the bottom surface of the ball will also affect the service life of the bearing. The phenomenon of uneven wear, especially the phenomenon caused by the small hole diameter of the tapered roller ball base surface, can lead to poor contact between the ball base surface and the large rib of the inner ring. If the angle difference of the inner ring ribs is too large and the surface roughness is too large, the uneven wear will cause spiral wear on the surface of the inner ring ribs.
 

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