With the development of society, Tapered Roller Bearings are widely used in automotive, rolling mills, mining, metallurgy, plastic machinery, and other industries. In the design of Tapered Roller Bearings, the bearing roller ball base surface and retaining edge contact state and the existence of problems will affect the bearing life. In the following, we will analyze the bearing roller ball base surface, large retaining edge contact problems, and the state of contact.

1. Tapered Roller Bearings ball base surface and large retaining edge contact in the problem.

In the large tapered angle Tapered Roller Bearings, the inner ring raceway, outer ring raceway, and roller outer diameter three surfaces mainly bear radial load, theoretically in a pure rolling state. In this paper, the angle between the outer ring raceway bus and shaft center line is about α = 25° ~ 29°, called large taper angle Tapered Roller Bearings. The bearing's ability to bear axial load is higher than general Tapered Roller Bearings, mainly used to bear radial and axial combined load mainly in one direction of axial load.

The design and processing method of conventional Tapered Roller Bearings' ball base surface does not meet the service life requirement of Tapered Roller Bearings. The main problems and the current situation are:

(1) the inner ring's large retaining edge surface and roller ball base surface wear is not uniform, roller ball base surface SR value scattered difference;

(2) abnormal temperature rise often occurs during the use of bearings;

(3) large taper angle Tapered Roller Bearings ball base surface and inner circle large edge contact position is abnormal, contact position sometimes appears in the inner circle large edge and roller ball base surface cavity diameter edge between, sometimes appear in the inner circle large edge and roller ball base surface radial chamfer edge between, that is, roller ball base surface and inner circle large edge between contact position often appear drift phenomenon;

(4) bearing inner circle big edge sometimes appears broken phenomenon.

Therefore, to effectively improve the service life of such large tapered Tapered Roller Bearings, first of all, we must solve the problem of the impact of roller bearing ball base surface shape on bearing performance. Based on the structural characteristics of these large tapered Tapered Roller Bearings and the basic law of the stress state and deformation of the roller, inner ring raceway, and large retaining edge after wear, the ball base surface shape of the bearing Tapered Roller Bearings is optimized and improved.

2. Tapered Roller Bearings ball base surface and inner ring large retaining edge contact state analysis.

Tapered Roller Bearings' ball base surface and inner ring big stop edge are working surfaces, producing sliding friction in work. Poor lubrication or contact position is not reasonable, will produce serious friction wear, burn or stress concentration, and then lead to bearing raceway, roller ball base surface, and outer diameter of early fatigue spalling and failure. Tapered Roller Bearings ball base surface shape, ball base surface of the cavity diameter size, and inner circle large edge shape is the main factor affecting the inner circle large edge abnormal temperature rise and bearing capacity, Tapered Roller Bearings ball base surface and inner circle large edge of the contact position is also a very important link. The abnormal contact position and wear condition between the inner circle's large retaining edge and roller ball base surface also affects the service life of the bearing. Uneven wear phenomenon, especially because the Tapered Roller Bearings ball base surface cavity diameter size is small and caused by the cavity diameter edge bulge, can cause the roller ball base surface and inner circle large retaining edge contact poor. If accompanied by the inner ring large retaining edge angle difference super poor, surface roughness super poor, and other problems, the uneven wear will cause the inner ring large retaining edge surface to spiral form wear. Therefore, according to the bearing inner ring large bezel condition appropriately increase the tapered roller ball base surface cavity diameter size, on the one hand, is conducive to the tapered roller two-end face equal area grinding, effectively ensuring the tapered roller two-end chamfer coordinate size; on the other hand, also conducive to improve the bearing work axial load and roller ball base surface SR value scattered difference and other factors lead to the uneven inner ring large bezel surface, roller ball base wear degree phenomenon.

In addition, at the contact point, the sliding friction's size and the contact point's location: when the diameter of the circumference of the contact point is small, sliding friction is small; vice versa, sliding friction is large. Therefore, the roller ball base surface and the large retaining edge contact position in the middle can effectively avoid or reduce large retaining edge fragmentation.

The above is about Tapered Roller Bearings, ball base surface, large edge contact, and bearing life relationship. If you need a more detailed understanding, welcome to contact us!