B30 斜板式アキシアルピストンポンプ・モータのスリッパの運動に関する数値解析 : オンバランス設計のスリッパのトライボロジー特性(OS12 フルードパワーの基礎と応用)

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This report presents a time-dependent mathematical model and numerical analysis of a hybrid (hydrostatic/hydrodynamic) thrust pad bearing as an over-clamped slipper with a restrictor of the low fluid film stiffness used in swash-plate type axial piston pumps and motors. The bearing's motion is simulated three-dimensionally, including roughness interaction, asperity contact and the time-lag between the changes in supply pressures and loads. Solutions are obtained regarding the friction, flow rate and contact pressure under mixed and fluid film lubrication conditions. Calculations indicate that the over-clamped slipper runs in fluid film lubrication in the low pressure period, but in mixed lubrication in the high pressure period. The time-lag affects markedly the motion and tribological characteristics of the slipper especially at the transition of the high and low pressure periods.
2009-09-01