Structure-optimized long-life tapered roller bearings

Abstract

The invention relates to a structure-optimized long-life tapered roller bearing which comprises an outer ring, an inner ring, a roller and a cage. The structure-optimized long-life tapered roller bearing is characterized in that an inner ring roller path bus, an outer ring roller path bus and a roller bus are in the shape of mutually matched logarithmic curve convexity. According to the invention, the stress distribution between the roller and the contact surface formed by the inner ring roller path and the outer ring roller path can be improved, so that edge stress can be eliminated and fatigue life of the bearing can be improved. Besides, the large flange root width of the inner ring and the bearing contact angle can be increased, thus the axial bearing capacity can be improved and the problem that the bearing can be damaged in the high torque and high axial load working conditions can be solved, furthermore, the bearing provided by the invention can be applied to meet the requirement of the main teeth of a main reducing gear of an eight-ton truck drive axle.

Description

technical field [0001] The invention relates to the technical field of rolling bearings, in particular to a structurally optimized long-life tapered roller bearing used on the main cone of an automobile drive axle. Background technique [0002] In an eight-ton truck drive axle newly introduced by a domestic axle factory, the tapered roller bearings on the main cone (general product 72212C / 72487) were originally foreign carburized steel bearings. In the localization process of the introduction and redevelopment of the axle, in order to reduce the cost significantly, it is required to use GCr15 bearing steel material. At the same time, in order to adapt to the common overload and poor road conditions of domestic trucks, it is required to use an output test torque exceeding 20% ​​of the rated torque when doing the axle bench test: 15000N.m; the bearing life requirement is 500,000 change. [0003] However, in the bench test of general-purpose bearings made of GCr15 steel, so...

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Problems solved by technology

[0003] However, in the bench test of general-purpose bearings made of GCr15 steel, some bearings break due to large ribs when they run less than 300,000 turns, causing the bearings to fail early; some bearings fail due to fatigue when they run less than 500,000 turns

After analysis: Under the action of high test torque, the main taper tapered roller bearing bears a considerable axial load, while the toughness of the bearing made of GCr15 steel is lower than that of the carburized steel bearing, resulting in the rupture of the large rib and the premature failure of the bearing

Similarly, under the action of high test torque, the fatigue damage of the bearing is accelerated and the service life is reduced

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