Bearing life calculationpdf

Craft Split Roller Bearings, in all shaft sizes and series, are manufactured in two types—held and float (non-expansion and expansion).  They are manufactured as separate bearings to solve the problem of some applications needing to allow for shaft axial movement (parallel to the shaft) and others needing to be able to hold the shaft in a fixed axial position.Â

SKFbearing lifeCalculator

Disclaimer: The accuracy of this technical review is dependent upon the validity and the completeness of information supplied to Timken. Actual product performance is affected by many factors beyond the control of Timken. Therefore, the suitability and feasibility of all designs and product selection should be validated by you. For the above reasons, this review is submitted solely to provide you, a customer of Timken or its parent or affiliates, with data to assist you in your design. No warranty, expressed or implied, including any warranty of fitness for a particular purpose, is made by Timken by the submission of this review. Timken products are sold subject to Limited Warranty which is set forth in Timken’s terms and conditions of sale.

Held Bearing (HD)              The held bearing accepts both radial (perpendicular to the shaft) and axial (parallel to the shaft) loads. The main purpose of the held bearing is to “anchor” a shaft in position, to prevent shaft drift during operation, and absorb thrust or “side” load imposed by the equipment in operation. The held bearing is normally mounted on the drive side, or drive end of a piece of equipment, directing shaft expansion away from the drive. In applications where a high thrust load is expected or realized, please contact our technical department for advice on proper bearing selection.

Ballbearing lifein hours

The float or “expansion” bearing is designed to take radial (perpendicular) load only. It is designed to allow for thermal growth of a shaft during operation.  The floating bearing is normally mounted opposite the drive end of a shaft and used in conjunction with a held or fixed bearing when both bearings are mounted on a common shaft section.

Calculate a catalog bearing life using the loads applied to the bearing and limited description of the local environment.

In most applications, one of each type bearing is mounted to each solid shaft section. In the instance of long line shafting, one held bearing is normally used with the rest being floating type. Exact placement of the bearings can vary.  When using both floating and held type Craft bearings in an application, be sure to maintain individual bearing components of each type separately as they are shipped.  Bearing parts are not interchangeable, and individual bearing components are manufactured—and matched—at our plant for proper internal clearance and fit.  Mixing components during installation may cause less than desirable performance or premature failure.

Learn more about bearing fatigue life by referencing our Help Guide. Don’t know your part number? Try our Bearing Search tool.