在研制的实验台上对含间隙转动副的空间机构进行了研究。使用ＴＤ８００测试系统，能够实时地测出转动副轴心的运动轨迹、振动波形以及轴在空间的运动姿态。通过大量的实验，得出了轴与套的分离主要发生在摇杆摆动的极限位置处，而其它位置大部分是接触的。同时也发现轴存在轴向窜动，大部分时间在两端面接触。在速度较高时，在两端伴有跳动 Space mechanism with gap rotation pair was researched on the experimental platform developed. Using the TD800 test system, real-time measurement of the kinematic trajectory of the revolving countershaft, the vibration waveform, and the attitude of the shaft in space. Through a large number of experiments, it is concluded that the separation of the shaft and the sleeve mainly occurs at the limit position where the rocker swings, while most of the other positions are in contact. Axis also found that there is axial movement, most of the time in contact with both ends. At higher speeds, there is beating on both ends