How should occasional impact loads be recorded when most operation is lightly loaded?

LILY Bearing | 2026-10-28

Best answer

A short event can raise a different design concern

A shock can matter because of its peak contact loading even when it occupies little operating time.

Static-contact deformation and accumulated rolling fatigue are different concerns, so hiding a transient in a long-duration average can lose the information needed for either assessment. JTEKT includes vibration and impact in load estimation and separately discusses static loading. The first task is therefore to describe the event credibly: what caused it, where the force entered the machine, whether the shaft was rotating, and how often it occurred. A guessed multiplier with no connection to the actual event is weaker evidence than an honestly identified measurement gap.

Use an event log that can support the next calculation

Create one entry for each relevant event class, such as a start-up jam, an emergency stop or a product impact.

Record the date or duty phase, shaft speed, estimated peak force, duration, repetition and source of the estimate. For an illustrative 0.1-second event occurring every ten minutes, the small time fraction does not by itself show acceptable peak stress. Keep the event available for the specific static and fatigue review rather than reducing it to one average number. If the peak is unknown, identify how it will be measured or bounded. The log supports engineering evaluation without inventing a safe shock limit for the bearing.