<p>Aiming at the adhesive wear and fracture problems of the TC bearing in the drive shaft of the positive displacement motor, this study reveals the failure mechanism and optimization strategy of the TC bearing through experiments and numerical simulations. Failure analysis indicates that the moving sleeve and static sleeve of the TC bearing generate local high temperatures due to intermittent collisions and mutual friction, which leads to adhesive wear. The high temperature induces secondary quenching of the steel, forming a brittle martensitic structure, which is the main cause of the brittle fracture of the TC bearing. To analyze the anti-friction and cooling effects of the lubricating film of drilling fluid on the bearing, the viscosity-temperature effect of the drilling fluid is introduced, and a numerical coupling model of the Reynolds equation and the energy equation is established. On this basis, two types of textured surface parameterized models, namely elliptical textures and rectangular grooves, are constructed to systematically investigate the effects of the skew angle and depth on the bearing capacity, friction force, and lubricating film temperature. The numerical results show that the elliptical texture can enhance the lubricating film bearing capacity and significantly reduce the friction force when the skew angle is 60° and the depth is 30&#xa0;μm. The rectangular groove achieves the best lubricating film bearing capacity and anti-friction effect when the skew angle is 75° and the depth is 20&#xa0;μm. Compared with the smooth surface, the lubricating film temperature of the elliptical texture and the rectangular groove is reduced by approximately 11.4% and 7.3%, respectively, under their optimal parameter configurations. This study provides a theoretical solution for the surface texture optimization design of the TC bearing to resist adhesive wear failure.</p>