Analysis of the bearing capacity of a single-row four-point contact ball slewing bearing
A single-row four-point contact ball slewing bearing is a large bearing with a compact structure, smooth movement and strong bearing capacity. It is widely used in engineering machinery, and entertainment facilities. The analysis of its bearing capacity mainly starts from the contact problem, because the slewing bearing transmits load and motion through point contact between the inner and outer rings and the rolling elements.
Based on the Hertz contact theory, the contact ellipse major and minor semi-axes, contact area and maximum contact stress between the inner and outer rings and the rolling elements can be calculated in detail. At the same time, the elastic finite element contact model and the elastic-plastic finite element contact model of the slewing bearing are established and solved to obtain the stress-strain cloud diagram of each part, and the cause of raceway failure is analyzed in combination with actual working conditions.
Studies have shown that the bearing capacity of a single-row four-point contact ball slewing bearing is affected by the contact angle between the ball and the raceway. At room temperature, when the contact angle is in the range of 45°~60°, the outer ring contact stress is relatively small, so a contact angle of 45° is often used. However, under high temperature conditions, increasing the contact angle can effectively reduce the contact stress and improve the bearing's bearing capacity.
