Bearingaxialloadcalculation

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For most cases, the L10 life obtained from the basic rating life formula described earlier will provide a satisfactory criteria for bearing performance. For particular applications, however, it may be desirable to consider life calculations for different reliabilities and special bearing properties and operating conditions.

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Bearing loadcalculation

More often than not, bearings whose loads are primarily radial are also subjected to some axial forces. When the magnitude of this axial component of the load is greater than a negligible value, it is convenient to interpret this combined radial and thrust load in terms of a simple radial load so that the basic life equation may be used. This simple radial load is referred to as the equivalent load. It is defined as the constant stationary radial load that, if applied to a rotating inner ring, would lead to the same life calculation as the actual conditions of load and rotation. For conventional bearing types other than those with filling notches, the equivalent radial load is given by the maximum of the two values where:

What is radialloadon abearing

In calculations for miniature and instrument bearings whose outside diameter is .625 inches and below, the following values are sufficiently accurate: X=0.56, Y=2.10 and e=0.16. With the larger bearing series, consult the following table (see below) for determining values X, Y and e. In all series the rotational factor V is 1.0 for inner ring rotation and 1.2 for outer ring rotation with respect to load.

Loads are seldom applied ideally. Often, the conventional rating life has to be modified due to application abnormalities, intentional or unknown. The following conditions have the practical effect of modifying the ideal, theoretical rating life (L10):

Thrustload bearing

A bearing's effective life is often governed by the lubricant's life. This is usually the case for applications involving very light loads and/or very slow speeds. In such instances, the conventional fatigue life calculated will be unrealistically high. The lubricant's ability to provide sufficient film strength is affected by:

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Bearing loadcapacity

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For 440C, NHBB recommends reducing the load rating published for 52100 by 20%. This is a conservative approach to ensure that the bearing capacity is not exceeded under the most adverse conditions. This is incorporated in the reliability modifier (a2) as shown:

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In the following chart, the factor e represents the ratio of Fa /V Fr for which the two equations are equal. If the ratio of loads is such that Fa /V Fr < e, then formula (a) is used; if Fa /V Fr > e, then formula (b) is used.

For a more conservative estimate of life than L10, multiply the above formula by a reliability modifier (a2). Values for a2 can be found in the Reliability Material Life Modifier table shown below. The table provides selected modifiers for calculating failure rates down to 1% (L1) for both 440C and 52100 alloys.

SKFbearing loadcalculation

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The static load rating (Co) given in the product listings is the radial load that a non-rotating bearing will support without damage. In evaluating static load conditions, any forces exerted during assembly and test must be considered along with vibration and impact loads sustained during handling, test, shipment and assembly.

C = dynamic radial load rating (lb) The dynamic radial load (C) can be found on the product listing pages.Pr = dynamic equivalent radial load (lb) See calculating dynamic equivalent radial load below.

Utilize the following load calculations, in conjunction with the life modifiers listed below, to estimate a bearing's operational life. Please contact the Precision Division if you need assistance.

Equivalentbearing loadformula

Bearing loadcapacity chart

New Hampshire Ball Bearings, Inc. (NHBB) is a leading manufacturer of precision bearings and complex bearing assemblies for the global aerospace, defense, medical, and high technology markets. The company is a subsidiary of MinebeaMitsumi Inc. and an integral part of the global brand, MinebeaMitsumi Aerospace.

While it is difficult to provide the exact effect upon life under any of these conditions, NHBB can provide bearing life estimates based on empirical data to help you forecast bearing life for your application.

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In many applications, bearings operate at different loads and speeds for extended periods of time. If the data for loads, speeds and their time periods are available, the following formula can be used to calculate life:

The presence of a thin film of oil at the mutually contacting ball-to-raceway interface enhances the load capacity of a ball bearing.

The rating life L10 of a group of apparently identical ball bearings is the life in millions of revolutions that 90% of the group will complete or exceed. For a single bearing, L10 also refers to the life associated with 90% reliability. The rated life (L10) can be computed from the formula:

Dynamic loading (C) includes built-in preload, weight supported members, and the effect of any acceleration due to vibration or motion changes. The dynamic load rating (C) for a radial or angular contact ball bearing is a calculated, constant radial load that a group of apparently identical bearings will theoretically endure for a rating life of one million revolutions. The dynamic load rating is a reference value only. A base value rating life of one million revolutions has been chosen for ease of calculation. The dynamic load rating values (C) given in the product engineering tables, found on this website and in our catalogs, include the effects of race-to-ball conformity and are in accordance with ABMA standards #9 and #12.

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