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Spherical Bearings – Accommodating Misalignment
Spherical bearings come in many different types to accommodate a wide variety of applications. What all of them have in common is the
ability to accommodate misalignment from mounting or shaft deflection.
How Spherical Bearings Work
Regardless of the type of spherical bearing, they all have the same working principal. They all have outer rings that with concave (spherical)
inner raceways. The inner rings similarly have convex outter raceways (or rolling elements that create a matching convex sliding surface).
What separates the various types of spherical bearings is the design of their sliding surface. Some are ring-to-ring (such as spherical plain bearings and rod ends), others use rolling elements such as balls or rollers between the inner and outter rings.
The animation to the right shows how a spherical ball bearing can reposition the balls and associated inner ring within the outer raceway to
accomodate a mis-alignment with the shaft.
Spherical Ball Bearings
More commonly known as Self-Aligning Double Row Ball Bearings,
spherical ball bearings are designed to work in applications where severe misalignment exists whether
from mounting or shaft deflection. The concave raceway of the outer ring in combination with two rows of balls operates over a wide range
of contact angles. Furthermore it aligns itself correctly with the shaft and assembly without causing undue stress on the rest of the bearing
assembly. Noteworthy is that the self-aligning ball bearing has the lowest friction of all rolling bearings, which enables it to run cooler even at high speeds. Furthermore, the
design allows for easy mounting and dismounting.
Spherical Roller Bearings
Spherical Roller Bearings are designed to work in applications where severe misalignment exists whether from mounting or shaft deflection
and with relatively heavy radial loads and some axial loads in either direction. They are also extremely resistant to shock loads and their
self-aligning feature allows full capacity loading despite shaft deflection. They are very similar in purpose to Self-Aligning Double Row Ball Bearings, except the Spherical Roller Bearings are designed to be more robust by carry heavier loads but at lower
maximum speeds.
***6bearing