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In addition to shaft rotation there are other dynamic motions that need to be taken into account. Perpendicularity of the axis of the rotary and stationary components and axial shaft motion, whether caused by tolerance build-up, static or dynamic deflection, all need to be addressed. The most important thing is that seal faces need to remain flat and together to minimize leakage. A review was presented of practical design solutions to handle ancillary movements, and to maintain flexibility over extended periods of time in challenging environments. These problems include clogging with solids, solids buildup, and vibration. Seal designs are made to allow for shaft angular misalignment and face runout and shaft axial motion. Other design features are used for avoiding eccentric operation. Bellows and elastomer encapsulated diaphragm springs help to reduce hang up due to clogging and debris.
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area on the peaks typically measures 0.2-0.6 mm. The metal profile also appears to be hollow with some form of flexible core, referred to as a 'spring insertion', but this is not discussed.
forced axially into assembly with the seal component to permit the end of the flange to pass by. The retention lip then returns to shape to capture the flange and thereby support the components against disassembly in the reverse direction.
This patent describes a piston ring that is claimed to provide reduced friction and wear. The design allows independent adjustment of the parameters controlling friction and wear to eliminate the trade off between low friction and low wear typical of prior art rings. The contact interface area betwe