ISO 21250-4:2020 PDF
Rolling bearings — Noise testing of rolling bearing greases — Part 4: Test and evaluation method NQ
Rolling bearings — Noise testing of rolling bearing greases — Part 4: Test and evaluation method NQ
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 10
- Дата публикации:
- 13 июля 2020 г.
- Издание:
- ISO IS 21250 edition 1 version 1
- ICS:
- 21.100.20
This document specifies the testing and evaluation method of rolling bearing grease noise in accordance with the method NQ.
Abstract
Overview
ISO 21250-4:2020 - "Rolling bearings - Noise testing of rolling bearing greases - Part 4: Test and evaluation method NQ" specifies the NQ measurement and evaluation procedure for assessing noise generated by greased rolling bearings. The standard defines how to prepare test bearings, record vibration pulses from grease-related shock events, count noise pulses across fixed intervals, and classify grease noise performance. It is intended to support grease developers, bearing manufacturers and test laboratories in quantifying grease-related bearing noise and improving low‑noise lubrication.
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