调心球轴承有圆柱孔和圆锥孔两种结构，保持架的材质有钢板、合成树脂等。其特点是外圈滚道呈球面形，具有自动调心性，可以补偿不同心度和轴挠度造成的误差，但其内、外圈相对倾斜度不得超过3° With two structure of bore cylindrical or tapered and retainers made of steel sheet or synthetic resins,the bearings are characteristic of their spherc-cally formed outer ring raceways allowing for misalignment within3 de-flection between inner ring and outer ring,so as to compensate concentricity and deflection errors.