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<p>During the operation of gearboxes and hydraulic assemblies, it is unavoidable that the lubricants (oils) used are subjected to a&#xa0;variety of different loads. The loads during operation are caused by mechanical and chemical damage mechanisms that accelerate the damage behavior to varying degrees. The oils are adapted to different damage mechanisms to varying degrees and can be evaluated and selected by experts. When used in gearboxes, the oils must meet high requirements in terms of mechanical and chemical resistance and, above all, oxidation stability.</p><p>Oxidation of the oils is primarily caused by the reaction between oxygen and the oil catalyzed by temperature and particles. A&#xa0;new measuring method has been developed which has demonstrated that the extent of oxidative damage to oils depends on the extent of the contact surface between oil and air. During the operation of gearboxes, it is unavoidable that air is mixed in with the oils due to splash effects and mechanical stress. The size and size distribution of the air bubbles in the oil demonstrably depends on the geometry as well as the current speed-torque ratio during operation of the gearbox.</p><p>In the work presented, a&#xa0;measurement is shown in which a&#xa0;relationship between the temperature and the resulting dispersion spectrum during an application is clearly illustrated.</p>

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Effect of temperature on bubble characteristics and oil-air contact surface area in machine oils

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月21日

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  • Lukas Hafner,
  • David Placzek,
  • Timm Hieronymus,
  • Tobias Pramstaller,
  • Fadi Dohnal

摘要

During the operation of gearboxes and hydraulic assemblies, it is unavoidable that the lubricants (oils) used are subjected to a variety of different loads. The loads during operation are caused by mechanical and chemical damage mechanisms that accelerate the damage behavior to varying degrees. The oils are adapted to different damage mechanisms to varying degrees and can be evaluated and selected by experts. When used in gearboxes, the oils must meet high requirements in terms of mechanical and chemical resistance and, above all, oxidation stability.

Oxidation of the oils is primarily caused by the reaction between oxygen and the oil catalyzed by temperature and particles. A new measuring method has been developed which has demonstrated that the extent of oxidative damage to oils depends on the extent of the contact surface between oil and air. During the operation of gearboxes, it is unavoidable that air is mixed in with the oils due to splash effects and mechanical stress. The size and size distribution of the air bubbles in the oil demonstrably depends on the geometry as well as the current speed-torque ratio during operation of the gearbox.

In the work presented, a measurement is shown in which a relationship between the temperature and the resulting dispersion spectrum during an application is clearly illustrated.