Oil Film Formation of Reciprocating Seals Observed by Interferometry

Yoshimura, Kenichi; Suzuki, Nozomu; Mizuta, Hirotaka

doi:10.2474/trol.9.106

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…Rana and Sayles [35] improved the experimental device, improved the measurement accuracy of performance parameters, and reported that particle impurities would adhere to the seal surface or embed in the matrix material, which would aggravate the wear of the seal ring, and once the seal was distorted, the leakage would increase. Yoshimura et al [36] designed an experimental device for observing oil film thickness with a high-speed CCD camera, which confirmed the feasibility of solving friction by using average oil film thickness. Heipl and Murrenhoff [37] built a high-speed hydraulic reciprocating test bench with a maximum test speed of 10 m/s, a temperature range of 20∼100°C and a maximum pressure of 10 MPa, and studied the effects of acceleration, medium pressure and temperature on the friction of hydraulic seals.…”

Section: Overview Of Hydraulic Sealsmentioning

confidence: 96%

Research status and prospect of wear and aging on hydraulic rubber sealing materials

Zhang

Yang

Wang

et al. 2023

Plastics, Rubber and Composites

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The aging and wear of rubber seals cause frequent maintenance of the hydraulic system. Based on the literature, the failure mechanism of aging and wear of rubber materials in hydraulic system was studied in this paper. Fretting wear, abrasive wear, fatigue wear and adhesive wear were the main wear mechanisms. The swelling aging of rubber accelerates the wear. At the same time, the factors affecting the wear resistance of rubber such as temperature, displacement amplitude, liquid medium and surface roughness were discussed. The research status of improving the wear resistance of rubber in recent years was introduced from three aspects: reinforcing filler, surface treatment, heat generation and heat conductivity of rubber, and the development trend of hydraulic sealing technology in the future was prospected.

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Section: Overview Of Hydraulic Sealsmentioning

confidence: 96%

Research status and prospect of wear and aging on hydraulic rubber sealing materials

Zhang

Yang

Wang

et al. 2023

Plastics, Rubber and Composites

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show abstract

“…For the film thickness measurements, we used ellipsometry to guarantee a high accuracy in the nanometer range; see [26,29,30] for examples. Alternative methods for film thickness measurements require hollow and transparent glass rods [39][40][41][42], modified sealing rings [43,44], or modified lubricants [45]. One main advantage is that we can use almost any hydraulic rod made of different materials, e.g., hard-chromed rods as it is state of the art for hydraulic and pneumatic rods.…”

Section: New Measurement Proceduresmentioning

confidence: 99%

An Empirical Study on the Friction of Reciprocating Rod Seals at Predefined Lubrication Conditions and Shear Rates

2022

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A key factor influencing the friction of rod seals is a thin oil film, which is dragged into the sealing gap at outstroke and instroke. Accurate determination of oil film thickness in the sealing gap of rod seals is a challenging task since it is only in the range of a few nanometers. A novel measurement procedure to analyze the friction of common reciprocating sealing systems in direct relation to the shear rate and film thickness is introduced in this paper. Results from a first empirical study with film thicknesses in the range of a few nanometers and shear rates up to γ˙=107 s−1 were used to compare the friction of practically relevant polyurethane U-cups. The U-cups differ in their geometry and surface roughness. It is seen that even at such thin films, the measured friction of those seals can be approximated by Newtonian fluid friction (speed, film thickness, viscosity, contact area). In general, the novel measurement procedure is useful in a scientific and technical context, since it offers a new perspective on tribological mechanisms at thin film lubrication conditions.

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“…The oil film generation depends on operating conditions [4,5] and seal geometry [6], as well as seal material properties [7]. Using a method based on ellipsometry, it was found that the oil film thickness in the sealing gap of typical polyurethane U-cups is only in the sub-micrometer to nanometer scale [5,7].…”

Section: Introductionmentioning

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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Oil Film Formation of Reciprocating Seals Observed by Interferometry

Cited by 7 publications

References 13 publications

Research status and prospect of wear and aging on hydraulic rubber sealing materials

Research status and prospect of wear and aging on hydraulic rubber sealing materials

An Empirical Study on the Friction of Reciprocating Rod Seals at Predefined Lubrication Conditions and Shear Rates

Remarks on Modeling the Oil Film Generation of Rod Seals

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