Patent ID: 6286374
Filing Date: 2001-09-11
Classification: F16C,G01M

Abstract:
A preload measuring apparatus for measuring a preload of a rolling bearing which includes an inner race member, an outer race member, and a plurality of rolling elements rotatably interposed between said inner race member and said outer race member, said preload measuring apparatus comprising:a bearing support member supporting both ends of said inner race member in the axial direction of said rolling bearing;a pressurization member loading a predetermined load to one of said both ends of said inner race member in the axial direction through said bearing support member;an excitation member applying a vibration to said inner race member in the axial direction while said predetermined load is loaded on said inner race member by said pressurization member;a vibration sensor detecting a vibration which is generated on said outer race member and is caused by the vibration of said inner race member; anda controller capable of calculating a resonance frequency of said rolling bearing through an output signal of said vibration sensor and also calculating a true preload of said rolling bearing in accordance with the thus calculated resonance frequency, said true preload defining a preload of said rolling bearing before the predetermined load is loaded on said inner race member.