THE BEARING SOLUTION

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CONSIDERATIONS FOR THE ENGINEER

Torsional Spring Rate/Load Capacity The torsional spring rate and load capacity of C-Flex bearings is dependent upon length, width, and thickness of the internal flat spring beams. High angles of rotation require thin springs to reduce bending stress and thereby result in low torsional spring rates and correspondingly small load capacities. Bearings with thin spring beams, such as the C-Flex Series 10 bearings, typically allow for rotation angles of up to +/- 15 degrees for indefinite life with light loads. In comparison, series 20 bearings which have a heavier spring and can accommodate heavier loads, are rated for rotation angles of +/- 7.5 degrees at zero load for indefinite life while the series 30, which are heavier still, are rated for +/- 3.7 degrees.

Geometric Centershift
The rotation of the bearing sleeve segments is facilitated by bending of the flat spring beams which support them. This causes a slight radial shift of the sleeve segments relative to each other. For small angles of rotation, such as 2 degrees, the shift of geometric center of the rotated member will be minimal on the order of .02% of the bearing diameter, however increases to approximately 1% of the bearing diameter at a rotation of 15 degrees.

Cycle Life
The cycle life of C-Flex bearings is based upon the fatigue limit of the materials utilized for the spring beams. Bending and load stresses are considered in determining performance ratings which will statistically result in an infinite cycle life.

The flexure design is suitable for a variety of materials such as stainless steels of the martinistic or precipitation hardening variety: inconel, hastelloy, and beryllium copper among others.

Linearity and Hysteresis
The linearity of the C-Flex bearing, measured as the rotational deflection of the pivot vs. the torque required to induce this deflection, is relatively constant for angles of rotation up to 15 degrees. Hysteresis in the C-Flex bearing is defined as the difference of null positions when the flexure is deflected to a plus angle and then relieved, and then deflected to a negative angle and then relieved. The null position after the plus direction compared with the null position after the minus deflection is the angle of hysteresis.

Pivot Bearing
The C-Flex bearing or pivot is a cylindrical, limited rotational bearing, with a high relative radial and axial stiffness which is available in low, medium, or high torsional spring rates. It is typically available for maximum deflection angles of +/-30, but various configurations are supplied upon request. Torsional stiffness ranges from .0003 Lb-In/degree to 7.8023 Lb-In/degree. It can be used simply as an oscillating unit or an extremely sensitive critical element.

Custom Products
C-Flex Bearing Company can provide a vast array of custom alterations to our standard pivot bearings. If you have an application where a standard pivot bearing will not suffice then see if one of the alterations we offer below will suit your needs. If you have a requirement that can’t be met with the options listed here feel free to contact us and we can work with you to create a custom product just for your application.

PIVOT BEARING DESIGN GUIDE 

C-Flex Brochure 

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C-Flex Bearing Co., Inc. is a privately owned small business located in upstate New York. We have been incorporated since 1993. Under the current administration, we have been in business since 1988 however under different names. We began manufacturing turbine components for the gas turbine industry. In 1992, we generalized into basic machine shop work. In 1997, the three companies were merged into C-Flex Bearing Co., Inc. with the focus on our one product line, the frictionless bearing or pivot.

Information on pivot sizes and performance properties can be found HERE:

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