Tuesday 8 July 2014

The contribution of Spherical Roller Bearings in Fixing the Misalignments - Shaft Deflection

Misalignment is a condition where the centre lines of coupled shafts are non-coaxial. Normally, misaligning occur when aligning the shafts. If centre lines of coupled shafts are parallel, but it is not coincident, which is called parallel misalignment. If centre lines of coupled shafts meet at an angle which is called angular misaligning.

Commonly bearings used to rotate the shaft, reduce the friction. As bearings manufactured with very internal clearances, provide very accurate positioning of the shaft. As Bearings have small clearance does not perform well if they are misaligned. Self aligning bearings are preferable to fix the misalignment. Misalignment also occurred when mounting the bearings on the shaft. Shaft deflection and bearing mounting both causes the misalignment.

Misalignment causes the machine fault as early. As misalignment between two parts make an improper design of a machine which causes more stress on shafts and also increase the vibration on the machine. And machines can't bear the heavy burden due to its unconventional design. It causes the resulting fault. It leads to premature damage in the machine. It also affects the production. So misalignment should be detected and rectified. Fix the misalignment assists to reduce machine down-time, enhancing machine life, cost reduction and increasing process efficiency.

Spherical roller bearings are greatly fixing the misalignment. Normally, Spherical roller bearings are designed for heavy load applications. Especially spherical roller bearings are used in a severe misalignment existing application. Spherical roller bearing has two rows of rollers, which are located within the two inner ring raceways. It's covered by one common spherical outer race way. The center point of the curvature of outer ring raceway is coinciding with the axis of the bearing. As its central point of outer ring raceway is coinciding with bearing axis it cans self aligning. Due to its self aligning feature spherical roller bearings are effectively tolerating the loads in spite of the misalignment by shaft deflection. In spherical roller bearing, self aligning is attained by allowing the plane of the rollers to incline in order to the outer spherical raceway.

Features of Spherical Roller Bearings - Reduced friction torque, Insensitive to misalignment, Resist the frictional temperature, Increase operating speed, High temperature capacity

Spherical roller bearings are utilized in diverse applications such as printing presses, paper mills or coaters in high precision execution, railway vehicles, etc. Equally it is greatly reducing the frictional heat, widely utilized in high temperature applications. As well as it also applied in very arduous operating condition operations like continuous casters.

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