| 摘要 |
<p>PURPOSE:To enable accurate detection of a pre-pressure value by transmitting vibration between outer and inner rings through a rolling body of a bearing to measure a change in amplitude. CONSTITUTION:An oscillator 1b of a vibration generating section 1 is fixed on an outer ring 5a of a bearing 5 and a vibration receiver 3a of a vibration measuring section 3 is fixed on a hub shaft 7 fitted into an inner ring 5b. Then, when a power source of a pulse generator 1a is turned ON, the vibrator 1b outputs an ultrasonic vibration and the vibration is transmitted to the hub shaft 7 through an outer ring 5a, a steel ball 5c and an inner ring 5b and vibration of the shaft 7 is caught with the vibration receiver 3a to display a waveform on an oscilloscope 3f. Here, this transmission course has both contact parts between the steel ball 5c and the outer and inner rings 5a and 5b and a pre-pressure value indicating an intensity of contact varies with a screw input of a hub nut 11, the larger the pre-pressure value, the smaller the attenuation of vibration. By measuring a change in an amplitude before and after the transmission, the pre-pressure value is made clear. Moreover, it can be made clear sufficiently only by the use of vibration with specified one cycle high in S/N ratio.</p> |
