Roller type turntable bearing for super-tonnage crawler-type crane

Abstract

The invention belongs to the technology of slewing pedestal bearings and discloses a roller type turntable bearing for a super-tonnage crawler-type crane. The bearing is provided with six rows of cylindrical rollers and five of the six rows of axial cylindrical rollers are set as two rows above and three rows below, and the other row is a radial roller (14); six rows of rollers are arranged in a rollaway nest which consists of an inner ring (16) and an outer ring in a turntable bearing, wherein the outer ring is formed by connecting a seat ring, an outer gear ring (2) and a second outer ring (10); the outer ring and a crane chassis (29) are fixed into a whole; and the inner ring and a crane upper structure (30) are fixedly connected into a whole. The invention enables the axial force and the overturning moment borne by the turntable bearing to be borne by the upper two rows of rollers and the lower three rows of rollers so as to greatly improve the bearing capacity of the bearing under the condition of the same outer diameter and height; meanwhile, the height of the bearing is reduced, enhancing the operating reliability and safety of the crawler-type crane and reducing the manufacture cost.

Description

technical field [0001] The invention belongs to the technology of slewing ring bearings, and mainly proposes a roller slewing bearing for super-large tonnage crawler cranes, which is used for key parts of the slewing rings of super-large tonnage crawler cranes or cranes with similar working conditions. Background technique [0002] The structural form of the existing large-tonnage crawler crane slewing bearing is a three-row roller slewing bearing. For super-large tonnage crawler cranes, the small-diameter slewing ring is one of its selling points, which is easy to transport, so it has roughly the same external dimensions as the slewing bearings of large-tonnage crawler cranes; and it is required to have Very high load carrying capacity. However, according to the design and calculation method of the slewing bearing, under the same size limitation, there is an upper limit to the design load capacity of the slewing bearing. Therefore, this problem can only be solved from the...

AI Technical Summary

Problems solved by technology

However, according to the design and calculation method of the slewing bearing, under the same size limitation, there is an upper limit to the design load capacity of the slewing bearing. , we can only solve this problem from the aspects of the parts materials of the slewing bearing and some key parts structures, processing technology, etc.

Such as the use of high-strength materials (often imported from abroad, and require high matrix hardness), rollers with convexity, but the problem that follows is that high hardness makes processing difficult, resulting in increased processing costs; improve processing equipment and Its technology, etc., is difficult to achieve at the current domestic technology level.

At the same time, with the increase of tonnage, the structural strength of the bearing must be improved, which must increase the thickness of the bearing, which not only increases the production cost of the bearing, but also affects the structure of the main engine of the crawler crane, increases the weight of the main engine and increases the manufacturing cost

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