Life estimation device and life estimation method for rolling bearing

摘要

A lifetime estimation device to estimate a lifetime of a rolling bearing assembly comprising inner and outer rings includes a buildup height estimation unit to estimate in accordance with a predetermined rule a buildup height of the indentation based on the inputted depth of the indentation or the inputted indentation size; and a lifetime estimation unit to estimate the lifetime of the rolling bearing assembly, the lifetime estimation unit being configured to determine a preliminary estimate of the lifetime of the rolling bearing assembly based on a dynamic equivalent load, determine a rate of reduction in a rolling fatigue life based on the buildup height of the indentation, and apply the determined rate of reduction in a rolling fatigue life to the preliminary estimate of the lifetime of the rolling bearing assembly to determine an estimate of the lifetime of the rolling bearing assembly.

主权项

1. A lifetime estimation device to estimate a lifetime of a rolling bearing assembly comprising inner and outer rings, each ring having a rolling surface defined therein, and a plurality of rolling elements rollingly interposed between the respective rolling surfaces of the inner and outer rings, the lifetime estimation device comprising:
a buildup height estimation unit to receive at least one of an input indicating a depth of an indentation formed in one of the rolling surfaces of the inner and outer rings, and an input indicating an indentation size that represents a planar size of the indentation to estimate in accordance with a predetermined rule a buildup height of the indentation based on the inputted depth of the indentation or the inputted indentation size; and a lifetime estimation unit to estimate the lifetime of the rolling bearing assembly based on a relationship between a buildup height of the indentation and a ratio of reduction in a rolling fatigue life determined by tests conducted in advance, the estimated buildup height of the indentation and a dynamic equivalent load.