Abstract
It is generally agreed that radial lip seals are used in systems with a rotating shaft and a stationary lip. However, according to previous work, it was demonstrated that relative motion between the shaft and the lip has substantial effects on the hydrodynamic lifting load and sealing performances. Nowadays, new generations of textured shafts have emerged in order to reduce friction torque and improve reverse pumping, but no study has confirmed the effect of the relative motion between the rough lip and the shaft grooves on the rotary lip seal performances. In this work, an isothermal hydrodynamic lubrication was performed in transient conditions to investigate the effect of the relative velocity between an oblique grooved shaft and a rough lip. After confirming the validity of the current model with respect to previous works, simulations have underlined the effect of the grooved shaft with relative lip motion on the rotary lip seal performance. Indeed, by keeping the same relative velocity between surfaces, it is shown that moving the shaft with a rate higher than that of the lip surface could produce an important reverse pumping and reduce the friction torque significantly, in comparison with cases where the shaft velocity is weaker.
Highlights
It is known that rotary lip seal is the type of seal widely used in industry for rotating shaft applications, since they represent an efficient and reliable device to retain lubricants and provide a safe sealing mechanism against the entry of external impurities
We assume that the rotary lip seal operates under hydrodynamic regime, In this study, we assume that the rotary lip seal operates under hydrodynamic regime, which which means that the load applied in the contact zone is fully supported by the lubricating film
The obtained results allow the conclusion that shaft motion is substantial in providing a good lip seal functioning, since it assures a good reverse pumping rate and an important support load and a low friction torque
Summary
It is known that rotary lip seal is the type of seal widely used in industry for rotating shaft applications, since they represent an efficient and reliable device to retain lubricants and provide a safe sealing mechanism against the entry of external impurities. In previous studies it was shown that good operating conditions of lip seal are reached when a thin lubricating liquid film (a fraction of a micrometer) separates the two surfaces [1]. This film is generated throughout the asperities in both antagonist surfaces providing a high wear resistance [2,3,4]. In order order to tocarry carryout outan ananalysis analysisthat thatdescribes describes the the complex complex behavior behavior of of aa successful successful lip lip seal seal functioning, a hydrodynamic model is required to describe the lubricating film attitude. In our previous work [9]
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