Contact ball slewing bearing

Abstract

The invention discloses a contact ball slewing bearing, which comprises an outer ring raceway, an inner ring raceway, and a steel ball (3) positioned between the two; two first main contact points (A1) exist between the steel ball (3) and the outer ring raceway; two second main contact points (B1) exist between the steel ball (3) and the inner ring raceway; a first auxiliary contact point (A2) also exists between the steel ball (3) and the outer ring raceway; and a second contact point (B2) also exists between the steel ball (3) and the inner ring raceway. The slewing bearing has the advantages of high bearing capacity, long service life and low cost.

Description

technical field [0001] The invention relates to the technical field of slewing bearings, in particular to a contact ball slewing bearing. Background technique [0002] Slewing bearings are widely used in modern industry and are called "mechanical joints". They are widely used in various engineering machinery fields such as lifting machinery and wind power generation machinery. [0003] Please refer to figure 1 and figure 2 , figure 1 It is a structural schematic diagram of the outer ring raceway of a typical contact ball slewing bearing in the prior art; figure 2 It is a structural schematic diagram of the inner ring raceway of a typical contact ball type slewing bearing in the prior art. [0004] The contact ball type slewing bearing in the prior art includes an outer ring 1' and an inner ring 2', the outer ring 1' has an outer ring raceway, the inner ring 2' has an inner ring raceway, and steel balls are located between the outer ring raceway and the inner ring racew...

AI Technical Summary

Problems solved by technology

In this structure, there are theoretically four contact points between the steel ball and the raceway. This four-point contact slewing bearing has a weak bearing capacity due to the small contact area between the raceway and the steel ball, thus reducing the bearing capacity of the raceway. the life of the raceway

[0006] For the slewing bearings used in wind turbines, the design life is required to be 20 years, so strict requirements are put forward for the slewing bearings. However, the contact ball slewing bearings introduced above are difficult to meet the requirements, or they can meet the requirements but the volume is large

In addition, large and extra-large crawler cranes also pose a challenge to the bearing capacity of the slewing bearing. Although the current three-row roller slewing bearing can meet the requirements, the cost is very high

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