Three-circle double-raceway slewing bearing

Abstract

The invention relates to a three-circle double-raceway slewing bearing and belongs to the technical field of slewing bearings. The three-circle double-raceway slewing bearing comprises an outer ring and an inner ring, wherein the inner wall of the outer ring and the outer wall of the inner ring are respectively provided with a first annular groove and a second annular groove; the three-circle double-raceway slewing bearing also comprises a central circle which is arranged between the outer ring and the inner ring; the inner and outer walls of the central circle are respectively provided with a third annular groove and a fourth annular groove which are symmetrically shaped and are corresponding to the second annular groove and the first annular groove; an external circular raceway is formed by the first annular groove and the fourth annular groove; an internal circular raceway is formed by the second annular groove and the third annular groove; the external circular raceway and the internal circular raceway are respectively provided with a plurality of rolling units; a spacing block is arranged between two adjacent rolling units; sealing rings are respectively arranged at the up and down joint of the outer ring and the central circle and the up and down joint of the central circle and the inner ring. The three-circle double-raceway slewing bearing provided by the invention is suitable for special main engine equipment for performing double rotation.

Description

technical field [0001] The invention relates to the technical field of slewing bearings, in particular to a three-turn double-raceway slewing bearing. Background technique [0002] The slewing ring is a large or super large combined bearing with ring gear, multi-functional holes, oil passage and sealing ring, which can bear axial force, radial force and overturning moment at the same time. [0003] Most of the slewing bearings currently used are single raceway slewing bearings, such as figure 1 As shown, it includes an inner ring 1', an outer ring 2' and several steel balls 3', the upper and lower ends between the inner ring 1' and the outer ring 2' are respectively provided with a sealing ring 4', and the inner ring 1' The outer surface is provided with a semicircular annular groove 11', the inner surface of the outer ring 2' is provided with a semicircular annular groove 21', and the annular groove 21' of the outer ring 2' and the inner ring The annular groove 11' of 1' ...

AI Technical Summary

Problems solved by technology

[0003] Most of the slewing bearings currently used are single raceway slewing bearings, such as figure 1 As shown, it includes an inner ring 1', an outer ring 2' and several steel balls 3', the upper and lower ends between the inner ring 1' and the outer ring 2' are respectively provided with a sealing ring 4', and the inner ring 1' The outer surface is provided with a semicircular annular groove 11', the inner surface of the outer ring 2' is provided with a semicircular annular groove 21', and the annular groove 21' of the outer ring 2' and the inner ring The annular groove 11' of 1' forms an annular raceway with a circular cross section, and steel balls 3' are installed in the annular raceway. The spherical surface of each steel ball 3' has four points contacting the wall of the annular raceway, which is called "Single-row four-point contact ball type", the slewing bearing can have a ring with a gear, an inner ring with an internal gear or an outer ring with an outer gear. During installation, the gearless gear is generally fixed on the main part of the host equipment , to allow the ring gear to transmit force, rotate and rotate. The slewing bearing of this traditional single raceway can only be "single-turning". The structure is bloated, and the existing slewing bearing has few contact points, uneven force, poor stability, low precision and short service life

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