Elastohydrodynamic Lubrication of Oil Film seals under High Speed Reciprocating Motion

高速往复运动下油膜密封件的弹流润滑

• 批准号: 17560121
• 负责人: SAKI Kunio
• 金额: $ 1.92万
• 依托单位: KYUSHU UNIVERCITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560121/
• 关键词: Oil film seal; EHL; Floating bush seal; Hydraulic cylinder; Vibrator; FEM; 浮動リング; 逆くさび形状

This study deals with oil film seals (floating bush seals) under high-speed reciprocating motion in hydraulic equipments.A numerical method of Elastohydrodynamic lubrication for seal performance is presented. In this method, compliance matrix of floating ring and hydrodynamic analysis based on the finite element method are used. Effects of hydraulic pressure, size of ring, materials of ring and initial clearance on seal performance (minimum oil film thickness and oil leakage rate) are presented. It is shown that the oil leakage rate decrease under high hydraulic pressure owing to contractile displacement of ring. And it is found that seal gap become null in high-speed condition, caused by negative hydrodynamic pressure generated in seal clearance.In order to examine the validity of this numerical analysis, experimental tests have been performed, using seal rings made of polyamide resin.Measured results of oil leakage rate are confirmed to be in good agreement with predicted ones considering thermal expansion and elastic displacement of rings. Also, it is confirmed that rings with step on inner face are useful to hold clearance under high-speed condition.

研究了液压设备高速往复运动下的油膜密封（浮套密封）。提出了弹性流体动力润滑对密封性能影响的数值计算方法。该方法采用浮环柔度矩阵和基于有限元法的水动力分析。分析了液压压力、密封圈尺寸、密封圈材料和初始间隙对密封性能（最小油膜厚度和漏油率）的影响。结果表明，在高液压压力下，由于环的收缩位移，油泄漏率降低。在高速工况下，由于密封间隙产生负动水压力，密封间隙变为零。为了检验这一数值分析的有效性，用聚酰胺树脂制成的密封圈进行了实验测试。考虑环的热膨胀和弹性位移，泄漏率的实测结果与预测结果吻合较好。此外，还证实了在高速条件下，内表面有台阶的环有助于保持间隙。