| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of estimating a bearing preload. SOLUTION: In this bearing preload estimation device, a preload acting on a bearing 2 is estimated by generating ultrasonic wave from an ultrasonic probe 3 mounted on a bearing housing 1 for supporting the bearing 2 toward the bearing outer ring 20 of the bearing 2, and measuring the reflected wave from the boundary between the bearing housing 1 and the bearing outer ring 20. This device comprises an echo height ratio calculation means for determining an echo height ratio from the reflected waves received by the ultrasonic probe 3, a relational expression calculation means for determining the relational expression between the echo height ratio and a bearing load from first echo height and second echo height obtained by working at least two different bearing loads of a first bearing load and a second bearing load, and a preload calculation means for determining the bearing load where the echo height ratio is zero from the relational expression and determining this bearing load as the bearing preload.
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