2nd GENERATION LEAD MEASUREMENT

Jörg Seewig, Tobias Hercke

Abstract

Typically, a car has over 80 dynamically stressed seals. Since many years, the radial seal in combination with the shaft is a critical component for the automotive industry. A helix-like structure due to the manufacturing process (as a fingerprint of said process) can lead to an unacceptable oil consumption. In collaboration with Daimler, an objective method for characterising such function-relevant helix-structures better known as lead was developed. The lead parameters, which are relevant to leak-tightness, are derived from a least square fit of complex exponential functions in both directions radial and circumferential. The basic measurement setup consists of a stylus instrument in combination with a rotation unit.

Keywords

lead, leak-tightness, approximation

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IMEKO-WC-2009-TC14-573.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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