Standard Test Method for Determination of the Breakaway Friction Characteristics of Rolling Element Bearings

Importancia y uso:

5.1 This test is a simple, effective way of determining the ability of bearings to roll freely. Most bearing manufacturers do not supply information on the breakaway friction coefficient of their products and if this is a design factor, users often buy candidate bearings and try them until they find one that appears to operate more freely than the others. This test allows quantification of the breakaway friction characteristics of bearings. This test assesses the friction of a bearing as a tribosystem which includes its construction and lubrication. It has shown to correlate with use. If a bearing has a low breakaway angle in this test, its breakaway friction will be lower in service than the same size bearings that displayed a higher breakaway angle in this test.

5.2 Breakaway friction of bearings is important in instruments where forces are light and the bearings are used as pivots rather than for continued rotation. Low friction is often imperative for proper device operation.

5.3 Bearings with low breakaway friction are often sought for web handling rollers. Many rollers are driven only by tangential web contact and slippage can often damage the web. Low friction bearings are required.

5.4 This test is useful for screening bearings for any applications where breakaway friction is a design concern.

Subcomité:

G02.50

Referida por:

G0115-24

Volúmen:

03.02

Número ICS:

21.100.20 (Rolling bearings)

Palabras clave:

bearing friction testing; breakaway friction; coefficient of rolling friction; inclined plane; rolling; rolling friction;