Oil leakage and power loss from radial shaft seals used in automotive power transmission systems

在动力传动系统中，径向轴密封经常用于防止漏油。这些组件对运行可靠性的重要性给行业带来了巨大的挑战。关键表面参数的相关设计和标准化，如表面纹理和机器导角或轴导角是至关重要的。前者是任何表面的固有属性，通常也称为表面粗糙度，而后者是在制造轴期间形成的。效率、有效密封和可靠性这三个经常相互矛盾的目标需要数值和实验相结合的方法。将建立一个计算混合润滑条件下表面相互作用和流体动力流动的数值模型。数值模型将用于理解潜在的物理特性并为设计提供信息。同时，将创建一个组件级测试平台，以实验验证数值模型并对新组件设计进行基准测试。此外，将创建新的标准来描述使用光学干涉仪测量的接触面的波浪形和粗糙度。

Radial shaft seals are frequently used in power transmission systems to prevent oil leakage. The importance of these components for operational reliability provides a great challenge for the industry. Pertinent design and standardisation of key surface parameters such as surface texture and machine lead angle or shaft lead are paramount. The former is an inherent property of any surface, which is also commonly referred to as surface roughness whilst the latter is formed during manufacture of the shafts.The often contradictory objectives of efficiency, effective sealing and reliability require a combined numerical and experimental approach. A numerical model accounting for surface interactions and hydrodynamic flow in the mixed regime of lubrication will be created. The numerical model will be used to understand the underlying physics and inform design. In parallel, a component level test rig will be created to experimentally validate the numerical model and to benchmark new components designs. Additionally, new standards will be created to characterise the waviness and roughness of the contact surfaces measured using optical interferometers.