Bearingaxial load

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.

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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):

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:

Bearingload calculation pdf

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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.

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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:

Static load capacity ofbearingformula

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:

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.

SKFbearingload calculation

Specialized oils and greases which exhibit favorable performance characteristics over an extended period, are available.

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Bearingload capacity chart

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.

Radial load calculation 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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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.

Bearing loadsexplained

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:

It’s important to consider moment loads when choosing bearings for your application. Find out which thin section bearings are best suited for moment loads.

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.

Whether you need to review your bearings after failure or want to determine the lifecycle of bearings in your system, Slim Section Bearings can help.

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

Slim Section Bearings offers analysis before and after the sale of your parts. Our experts can use a variety of methods to determine the root cause failure of your bearing – all you need to do is complete an Application Data Sheet and email it back to us for review. Typical causes of bearing failure include:

How to calculate radial load onbearing

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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:

Slim Section Bearings, Inc. is the manufacturing division of Ritbearing Corp. With experience in manufacturing that began in 1987, we are able to give our customers the ability to obtain American-made thin section bearing products.

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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.

If you are looking for assistance during the design phase, we can also help determine life calculations and load distribution across the bearing. Once you provide your design parameters through the Application Data Sheet, our experts can simulate new parts in your system and evaluate an expected life calculation for your bearings.