| 摘要 |
PURPOSE:To control a pre-load amount precisely on the basis of the relational value between the pre-load amount and a resonance frequency by measuring the resonance frequency while oscillating a boll-and-roller bearing to be measured or a member which engages said ball-and-roller bearing directly or indirectly. CONSTITUTION:A pre-load amount detector is provided with an exciter 1 which oscillates the bearing 11 to be measured, a bearing box 12, or shaft 13, etc. Then, a clamping nut 14 is rotated and displaced in order to increase the pre- load amount of the ball-and-roller bearing 11 to be measured, and the shaft 13 to which the ball-and-roller bearing 11 to be measured is fitted is excited by the exciter; and a signal generated by the detection of a speed or acceleration sensor 4 is amplified by an amplifier 5, and analyzed by a frequency analyzer 6 to detect the resonance frequency of the ball-and-roller bearing to be measured. Then, the pre-load amount is controlled precisely on the basis of the relational value between the pre-load amount and resonance frequency. |
