What is bearing the load? Its purpose is?

About bearing all of us are not unfamiliar, but many people will ask: what pre load bearing? Have what is the purpose of bearing pre-load? The Chinese bearing network based on the summary to answer these questions. Bearing pre-load is applying 'use' in load ( The external load) Before, after the related to another bearing axial adjustment and effect on the bearing force, or by the size of the bearing inner race and rolling elements constitute a 'negative clearance' ( Internal pre-load) And the force generation. Bearing pre-load purpose mainly include the following: 1, the progress of bearing guide precision. Machine shaft guide precision with preloading of the bearing axis has higher guidance precision, due to the load axis under the action of bending can be restricted by preloading. Preloading differential bearing has higher guidance precision and high rigidity, and can insist on accurate and constant mesh, and additional dynamic force is small, therefore, running low noise, meshing gear has a short-lived life. 2, the progress rigidity. Bearing stiffness defined on the bearing force and the ratio of the elastic deformation of the bearing. Within a certain range of load, elastic deformation in the process of the load bearing is smaller than without the load bearing of the deformation. 3, low noise operation. The smaller the bearing running clearance, with no load roller guide is better, the less noise in the operation of the bearing. 4, compensate for wear and sink. Operation process, bearing wear and sink make clearance increases, but able to pre-load compensate. Compensation of wear and sink, operation and prolong the working life. 5, prolong the working life. In some places, the bearing pairs with configuration of pre-load progress running stable and prolong the working life. Because the right amount of preloading can improve bearing load distribution, so can increase its working life.