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Abstract
The authors have studied fundamentally and experimentally the explanation of the sealing mechanism of oil seals. It will be generally noticed that the suction of air occurs to the rubbing portion of the lip of an oil seal which is operating under sealing condition. For the purpose of studying sealing characteristics of an oil seal in the authors' investigations, the volume, [Qbar], of transferred lubricating oil instead of air is used as a means of estimating the sealing status.
The authors have clarified that there exists the relation, [Qbar]/uD2∞G1/2, wherein G, u and Dare nondimensional parameter of oil seals, sliding velocity of between shaft and seal and shaft outer diameter, respectively, and that suction coefficient of oil, K (=[Qbar]/uD2G1/2), is dependent on the sealing characteristic constant, Φ, the surface roughness and the lip material of seals.
In this paper, it becomes clear that there exists the relation, K = Ko + α(Φnor - Φcon), wherein Φcon are the values estimated by f/G1/3 in the case of normal installation of oil seal and in the case of converse installation, and f is the coefficient of friction, and that the Ko- and α-value are dependent on the surface roughness of the rotary shaft. It is then clarified that the deformation of the rubbing surface of seal lip depends on the frictional force between the seal lip and the shaft surface, and is closely related to the sealing mechanism of oil seals.
Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in Minneapolis, Minnesota, October 24–26, 1978
Notes
Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in Minneapolis, Minnesota, October 24–26, 1978
