Approach to the Description of Macro Lead Formation by Means of a Kinematics Simulation Model

Haffner, Georg; Baumann, Matthias; Schmuker, Stefan; Bauer, Frank

doi:10.1080/10402004.2022.2087574

Cited by 2 publications

(2 citation statements)

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“…The experimental basis of this study is 26 different shaft surfaces. They are taken from a study on the simulation of the manufacturing process of various macro lead characteristics [15]. These shafts are characterized by a wide range of structural properties.…”

Section: Methodsmentioning

confidence: 99%

“…While scratches are caused by improper handling, micro lead, macro lead and micro waviness are created during the manufacturing process of the shaft. The formation processes of lead are also part of previous and current research [11,[14][15][16]. This study considers manufacturing-related macroscopic lead structures of the categories "micro waviness" and "macro lead".…”

Section: Introductionmentioning

confidence: 99%

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Modeling the Pumping Behavior of Macroscopic Lead Structures on Shaft Counterfaces of Rotary Shaft Seals

Engelfried,

Haffner,

Baumann

et al. 2023

Lubricants

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The leak tightness of the sealing system rotary shaft seal is based on the formation of an active back-pumping effect of the sealing ring. Here, the sealing ring pumps the fluid in the sealing gap back into the housing. However, this active sealing mechanism is disturbed by so-called “lead structures”. Lead structures include all types of directional structures on the sealing counterface which create rotation-dependent axial fluid pumping. Lead-affected sealing counterfaces can thus cause leakage or insufficient lubrication of the sealing contact. To ensure leak tightness, lead must be avoided or tolerated. This article investigates how different structural characteristics of lead affect the amount of fluid pumped by the shaft surface. For this purpose, 26 shafts are subjected to surface analyzing methods and an experimental pumping rate test. The interaction of various geometric features of the lead structures and their combined effect on the pumping capacity is modeled based on the measured data. Appropriated correlation models are discussed and relationships between shaft lead and its pumping effect are shown. The aim is to estimate shaft pumping rates based on surface measurements in future. The results contribute to the derivation of measurable tolerance values for lead and to the prevention of leakage.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%