Pitch bearing used on wind driven generator

Abstract

The invention discloses a pitch bearing used on a wind driven generator, comprising an inner ring, an outer ring and a plurality of steel balls and a cage, wherein, a plurality of steel balls are arranged in a steel ball raceway formed by the combination of an arc channel on the outer surface of the inner ring and an arc channel on the inner surface of the outer ring; the cage is arranged betweenthe inner ring and the outer ring and is a steel ball shaped circular ring sheath, and the circumferential surface of the cage is provided with steel ball pockets with the same quantity as that of the steel balls in a uniformly distributed manner at intervals, each steel ball pocket is in a shape of a straight hole; a plurality of steel balls are respectively arranged in each steel ball pocket ofthe cage. The pitch bearing used on the wind driven generator of the invention adopts a cage with simple structure and convenient installation to replace the traditional separation block, thus solving the phenomena that due to the effect of own gravity, steel balls and separation blocks of traditional slewing bearing concentrate towards the lower part during vertical installation, and the contactforce of the steel balls and the separation blocks at the lower part is augmented, thus bringing about overlarge damping of bearing operation, enlarged bearing rotating force and even stuck event so as to ensure the bearing to operate flexibly.

Description

technical field [0001] The invention relates to a pitch bearing for a wind generator. Background technique [0002] my country is entering into the new "green industry" of wind power generation. In order to improve the power generation efficiency and increase the power generation capacity of wind power generators, the length of the blades, the size of the main shaft, the speed increaser, the generator and other parts are also expanding, but At the same time, the load borne by the bearings is also gradually increasing, which has very high technical requirements for wind power bearings. The pitch bearings and yaw bearings on wind turbines are four-point contact ball bearings and double-row angular contact ball bearings, which require high channel size and position accuracy, and have high static load capacity. The pitch bearing is mainly used to adjust the angle of the blade to ensure the constant speed of the blade. There are two structures with internal teeth and no teeth, an...

AI Technical Summary

Problems solved by technology

Because the pitch bearing is installed and used in a vertical state, it is also different from the horizontal installation state of ordinary slewing ring bearings, and the slewing ring bearings in the horizontal installation state generally use spacers to separate the steel balls in the steel ball raceway, and the arrangement is as follows: Steel ball—isolating block—steel ball... The material of the isolating block can be nylon, aluminum and copper. There will be some problems when the bearing of this structure is installed vertically: the steel ball and the isolating block will move toward each other due to their own gravity. The lower part is concentrated, forming an increase in the contact force between the lower steel ball and the spacer block, resulting in excessive damping of the bearing operation, and the bearing rotational force becomes larger or even stuck. This situation is quite obvious in the case of positive clearance, and in the case of negative clearance. also have some influence

Images