Wear on radial lip seals: a numerical study of the influence on the sealing mechanism

Grün, Jeremias; Feldmeth, Simon; Bauer, Frank

doi:10.1016/j.wear.2021.203674

Cited by 24 publications

(22 citation statements)

References 15 publications

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“…Different circumferential positions on the sealing edge have significantly different amount of wear. The common characteristic value for wear at the sealing edge of a radial lip seal is the wear (band) width [3,8,14]. It can be measured directly and determines the contact band width and thus the sealing function [15].…”

Section: Wear Evaluation Of the Sealing Edgementioning

confidence: 99%

Influence of Alternating Temperature Levels on the Wear Behavior of Radial Lip Seals: Test Rig Design and Wear Analysis

Merkle¹,

Baumann²,

Bauer³

2021

Applied Engineering Letters

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Radial lip seals are a common seal type for various industrial applications. In retarder breaking systems for commercial vehicles, radial lip seals are exposed to very fast changing oil sump temperatures. Due to increasing demands, the elastomer seals are increasingly failing premature in such applications. It is assumed that this is caused in particular by the very high temperature gradients, that result from the fact that a lot of braking power is dissipated within a short time. This is the case, for example, when braking while driving downhill with heavy loads. Since the temperature gradient is of minor importance in many applications, there are no publications regarding the specific influence of high temperature gradients on the function of radial shaft seals. Therefore, a test rig with advanced heating and cooling capacities is developed. A comprehensive test series is carried out, with the main focus on the influence of high temperature gradients on the wear behavior of the seals. Test results show, that different temperature levels lead to a significant change of the wear behavior. Additionally, fast changing temperatures are adding additional tribological stress to the sealing system.

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Section: Wear Evaluation Of the Sealing Edgementioning

confidence: 99%

Influence of Alternating Temperature Levels on the Wear Behavior of Radial Lip Seals: Test Rig Design and Wear Analysis

Merkle¹,

Baumann²,

Bauer³

2021

Applied Engineering Letters

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“…The mesh construction is based on [9]. An algorithm automatically meshes arbitrary sealing edge geometries (subdomain 1).…”

Section: Fe Meshingmentioning

confidence: 99%

“…The preprocessing and solving are done with MSC Marc/Mentat [27]. Figure 5 shows the FE [9] with permission from Elsevier model with the previously meshed radial lip seal segment. The element type used is an eightnode, isoparametric hexahedral element with trilinear interpolation functions.…”

Section: Materials Properties and Boundary Conditionsmentioning

confidence: 99%

The sealing mechanism of radial lip seals: A numerical study of the tangential distortion of the sealing edge

Grün¹,

Feldmeth²,

Bauer³

2022

tribomat

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The sealing behaviour of elastomeric radial lip seals is essentially affected by the sealing mechanism in the contact area between the sealing edge and the shaft surface. The relative motion between radial lip seal and shaft deforms the sealing edge tangentially in the circumferential direction. This mechanical deformation is considered essential for the sealing mechanism. In this study, a numerical approach is employed to simulate this deformation. A three-dimensional multiscale model serves this purpose. The radial lip seal geometry is described on the macro-scale. On the micro-scale, an artificial rough surface with a stochastic roughness distribution is applied to an ideal sealing edge surface. A new meshing algorithm is used to discretise different sealing edge surfaces and automatically generates structured hexahedral meshes of the sealing edges. Mesh transitions connect the resulting finely meshed sealing edge to the coarsely meshed global macro-scale mesh of the radial lip seal. The paper introduces the modelling method used to simulate the deformation of radial lip seals. Results are presented and discussed with reference to the sealing behaviour. This contributes to a better understanding of the sealing mechanism of radial lip seals. Keywords: radial lip seal, finite element analysis, surface roughness, elastic deformation, elastomers.

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“…It is conceivable that those imperfections cause discrepancies between simulations and experiments. An advanced approach including the surface roughness was already proposed in [38] and applied to radial shaft seals. Huang [9] performed simulations with textured rods.…”

Section: Current Limitationsmentioning

confidence: 99%

Remarks on Modeling the Oil Film Generation of Rod Seals

et al. 2021

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The oil film generation of a U-cup rod seal and the oil film thickness on the rod after outstroke were analyzed analytically, numerically, and experimentally. The analyzed sealing system consists of an unmodified, commercially available U-cup, a polished rod, and mineral oil. The inverse theory of hydrodynamic lubrication (IHL) and an elastohydrodynamic lubrication (EHL) model—both based on the Reynolds equation for thin lubricating films—were utilized to simulate the oil film generation. In the EHL analysis, physical parameters and numerical EHL parameters were varied. Both the analytical and numerical results for the varied parameters show that the film thickness follows a square-root function (i.e., with a function exponent of 0.5) with respect to the product of dynamic viscosity and rod speed, also referred to as the duty parameter. In comparison to the analytical and numerical results, the film thickness obtained via ellipsometry measurements is a function of the duty parameter with an exponent of approximately 0.85. Possible causes for the discrepancy between theory and experiments are discussed. A potential remedy for the modeling gap is proposed.

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Wear on radial lip seals: a numerical study of the influence on the sealing mechanism

Cited by 24 publications

References 15 publications

Influence of Alternating Temperature Levels on the Wear Behavior of Radial Lip Seals: Test Rig Design and Wear Analysis

Influence of Alternating Temperature Levels on the Wear Behavior of Radial Lip Seals: Test Rig Design and Wear Analysis

The sealing mechanism of radial lip seals: A numerical study of the tangential distortion of the sealing edge

Remarks on Modeling the Oil Film Generation of Rod Seals

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