Self-aligning roller bearing for main shaft of wind turbine generator and design method thereof

Abstract

The invention relates to a self-aligning roller bearing for a main shaft of a wind turbine generator and a design method thereof. The self-aligning roller bearing comprises a bearing outer ring, a bearing inner ring and two rows of rollers; and the self-aligning roller bearing is characterized in that the length of one row of rollers close to a wind wheel side on the self-aligning roller bearing is smaller than that of the other row. The design method of the bearing comprises the steps of: a, establishing a coordinate system; b. calculating stress of the main shaft by utilizing a formula F1=1/2C<F>RhoV<2>; c, calculating stress of the self-aligning roller bearing; d-1, calculating contact stress; d-2, fetching a lower limit value; d-3, fetching an upper limit value; d-4, implementing the calculation by utilizing a difference method, and d-5, calculating a proportionality factor satisfying an absolute value of (U - V) is smaller than 3U/100 or an absolute value of (U - V) is smaller than 3V/100, and designing a bearing meeting the requirement. According to the bearing and a bearing calculation method, the contact stress between each roller and a raceway can be effectively reduced; and a finite element method and the difference method are adopted, so that the difference value between the contact stresses of the two rows of rollers can be controlled within 3 percent, thereby solving the unbalance stress problem of the roller, reducing the failure rate and improving the service life of the bearing.

Description

technical field [0001] The present invention relates to a self-aligning roller bearing for a main shaft of a wind power generator and a design method thereof, more specifically, to a self-aligning roller bearing for a main shaft of a wind power generator with two unequal rollers applied to a megawatt wind power unit Bearings and their design methods. Background technique [0002] Wind energy resources, as a clean renewable energy, widely exist all over the world. The resources are abundant, inexhaustible, and environmentally friendly. Therefore, wind power generation is safe and clean, and can provide long-term and stable energy supply for human beings. At present, major developed countries and developing countries have taken the development of wind power generation technology as a national policy and an important means to deal with energy challenges in the new century. [0003] The transmission chain is the core part of the wind turbine, and the main shaft bearing is the ...

AI Technical Summary

Problems solved by technology

Due to the design characteristics of the double-row spherical roller bearing itself, when the thrust is received in the upwind direction, the load on the rollers on the downwind side is much greater than that on the upwind side. According to field tests, the force difference between the two rows of rollers is at least 3 times, the force on the front and rear rollers is unbalanced, and the wear of the rear rollers and their raceways is serious, which seriously affects the service life of the unit

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