Abstract
The lubrication modes of line contact between the vane and the camring in an oil hydraulic vane pump have been investigated. First, variations of the radial acting force of a vane were calculated from previously measured results of the dynamic internal pressure in four chambers surrounding a vane. Next, distinctions of the lubrication modes were made using Hooke’s chart, which represents an improvement over Johnson’s chart. Finally, the influence of boundary conditions in the lubrication region on fluid film lubrication was examined by calculating film pressure distributions. The results show that the lubrication modes of the vane tip are a rigidvariable viscosity region. This region discharges pressure higher than 7 MPa, and exerts a great influence on oil film pressure in the large arc section due to the Piezo-viscous effect.
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Abbreviations
- G :
-
Dimensionless material parameter =αE'
- g e=g3 :
-
Dimensionless elastic parameter
- g v=g1 :
-
Dimensionless viscosity parameter
- H :
-
Dimensionless oil film thickness =ho/R'
- h :
-
Oil film thickness
- h min :
-
Minimum oil film thickness
- P 1 :
-
Intra vane chamber pressure
- P 2 :
-
Pre-chamber Pressure
- P 3 :
-
Post-chamber pressure
- P 4 :
-
Bottom chamber pressure
- p :
-
Oil film pressure
- R' :
-
\(Equivalent radius = \tfrac{{RcRv}}{{Rc - Rv}}\)
- Rc :
-
Curvature radius of the camring
- Rυ :
-
Curvature radius of the vane tip
- u :
-
Mean velocity =Uv/2
- U :
-
Dimensionless velocity parameter
- Ugu :
-
Velocity of the vane
- ω :
-
Load per unit length
- W :
-
Dimensionless load parameter
- α :
-
Pressure viscosity index
- η :
-
Viscosity
- ηо :
-
Viscosity at the atmospheric pressure
References
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Cho, IS., Oh, SH. & Jung, JY. The lubrication characteristics of the vane tip under inlet pressure boundary conditions for an oil hydraulic vane pump. J Mech Sci Technol 19, 2179–2186 (2005). https://doi.org/10.1007/BF02916457
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DOI: https://doi.org/10.1007/BF02916457