Abstract: A new analysis and design method for rotational linkage which is made up of two rolling bearings is proposed. This method is specific for rotational linkage used in complicated environment with big temperature difference. Firstly, by using parameters such as the bearing’s radial clearance, axial displacement, maximal contact stress between balls and groove, the bearing safety map is drawn. By using information of the structure, material and fit form of the bearing system, the bearing clearance map is drawn. Secondly, the bearing clearance map is integrated into the bearing safety map and the relative position of the two maps is adjusted to make them have a maximal overlap. Lastly, the needed parameters of the bearing system are worked out according to the relative position between the bearing clearance map and the bearing safety map. The validity of this method is demonstrated by the development of the bearing system of a space joint.

Key words: Bearing, Bearing system design, Rotational joint, Temperature, Temperature difference