The starting torque of self-lubricating spherical plain bearings (SSPBs) is a key parameter for evaluating the performance of bearings. Therefore, the starting torque of SSPBs should be controlled to within an allowable range. In this paper, the starting torque generation mechanism is analyzed, and the critical load for the separation of the liner from the outer spherical surface of the inner ring is determined. A mathematical model of the starting torque is established; the experimental and theoretical results of the starting torque are compared and analyzed, and then the accuracy of the mathematical model is evaluated by the deterministic coefficient R². The research reveals that a critical load exists for the starting torque. Below the critical load, the starting torque is dependent on the outer spherical radius of the inner ring, bearing wrap angle, and liner parameters such as the compressive elastic modulus, friction coefficient, and precompression of the liner; however, the starting torque is independent of the radial load. Above the critical load, the starting torque is also dependent on the radial load. The research results provide a theoretical basis for the design and application of bearings.

自润滑关节轴承 (SSPB) 的启动扭矩是评估轴承性能的关键参数。因此，SSPB的启动转矩应控制在允许范围内。本文分析了启动扭矩的产生机理，确定了衬套与内圈外球面分离的临界载荷。建立了启动转矩的数学模型；对起动转矩的实验和理论结果进行对比分析，然后通过确定性系数R ²评价数学模型的准确性. 研究表明，启动转矩存在临界负载。在临界载荷以下，启动扭矩取决于内圈的外球半径、轴承包角和衬套参数，如衬套的压缩弹性模量、摩擦系数和预压缩；然而，启动扭矩与径向载荷无关。在临界负载之上，启动扭矩还取决于径向负载。研究结果为轴承的设计和应用提供了理论依据。