Design method for tapered roller bearing with roller ball basal surface in contact with middle part of inner ring flange spherical surface

Abstract

The invention relates to a design method for a tapered roller bearing with a roller ball basal surface in contact with a middle part of an inner ring flange spherical surface. The design method comprises the following steps of: determining a value of a ratio K of a curvature radius rho of the inner ring flange spherical surface to the curvature radius SR of the roller ball basal surface; determining a value defining method of an included angle theta between a connecting line from a contact point F of the roller ball basal surface and the inner ring flange spherical surface to a conical point O of a roller outer conical surface and a generating line of the inner ring roller; and establishing a calculation formula. The roller ball basal surface is in contact with the middle part of the inner ring flange spherical surface; the contact form of the roller ball basal surface and the inner ring flange spherical surface is point contact between a convex spherical surface with small radius and a concave spherical surface with large radius; the lubrication condition is good; a lubricating oil film is easily formed; the stress distribution is uniform; and during bearing work of the bearing, the temperature rise of the roller ball basal surface and the inner ring flange spherical surface is low, the wear is small, and the service life of the bearing is long. Actual use shows that the service life of the bearing is prolonged by over 20 percent in comparison with the service life of the bearing in the prior art.

Description

technical field [0001] The invention relates to the technical field of bearings, in particular to a design method of a tapered roller bearing in which the base surface of a roller ball contacts the middle part of the spherical surface of the rib of an inner ring. Background technique [0002] Tapered roller bearings consist of inner rings, outer rings, rollers and cages, such as figure 1 shown. The inner ring is provided with ribs, and the large end surface of the roller is spherical, which is called the spherical base surface. When the bearing is running, there is pure rolling between the rollers and the raceways of the inner and outer rings, and sliding between the base surface of the roller balls and the rib surface of the inner ring. The shape of the rib surface of the inner ring was originally a spherical shape, but was later changed to a conical shape. Due to technical equipment reasons, some tapered roller bearings still use spherical ribs. When the National Beari...

AI Technical Summary

Problems solved by technology

When the bearing is loaded, there will be severe friction between the base surface of the roller ball and the spherical surface of the rib of the inner ring, which will cause wear and heat, and reduce the service life of the bearing

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