Method for establishing statics model of extra-large double-row four-point contact ball bearing

Abstract

The invention discloses a method for establishing a static model of an extra-large double-row four-point contact ball bearing, and the method comprises the following steps of: under a precondition of setting a structure parameter, a material parameter and a load parameter, establishing a geometric model; taking an influence of an bearing running clearance into consideration of the geometric model; depending on a phenomenon that an inner ring is under a balance state under an action of an external load and loads of all rolling bodies, determining a mechanics equilibrium equation of the inner ring; introducing the structure parameter, the material parameter and a load situation of the known bearing into the mechanics equilibrium equation, and calculating displacements sigma a, sigma r and theta of a bearing inner ring, thereby obtaining total elastic contact deformation of a steel ball and a raceway as well as a normal contact load of a contact pair i on a position angle, to obtain contact load distribution of the bearing on various position angles; changing a bearing running clearance value, and drawing a contact load distribution chart of the bearing in various running clearances. Through a scheme design, the double-row four-point contact ball bearing is more precise; moreover, design accuracy of a service life of the bearing is greatly improved.

Description

technical field The invention belongs to the technical field of wind power bearing design, and in particular relates to a method for establishing a static model of an extra-large double-row four-point contact ball bearing considering clearance Background technique Extra-large double-row four-point contact ball bearings are mainly used in the pitch system of wind power generation equipment. The pitch bearings are generally installed at a height of 40-60m, and the installation and replacement are extremely inconvenient and costly. Therefore, the pitch bearing is required to have a service life of 20 years and high reliability. The pitch bearing bears a large impact load, so it is generally required to have zero clearance or negative clearance to reduce the fretting wear of the rolling working surface. The size of the negative clearance of the pitch bearing not only affects the assembly, the starting torque of the bearing, the rotation accuracy and the support stiffness, but a...

AI Technical Summary

Problems solved by technology

None of the above formulas consider the influence of the original clearance of the bearing, and are only suitable for bearings with zero clearance. For bearings with positive clearance and negative clearance, the above formula is wrong