Microstructured Surfaces in Highly Loaded Contacts - Differences Due to Sliding Effects
In the scope of this presentation, the impact of microstructures in highly loaded contacts where elastohydrodynamic lubrication theory applies on improving lubricant film formation and effects of friction reduction will be analyzed. The cam follower contact was chosen as a demonstrator for microstructured components in highly loaded revolving sliding contacts. This contact is compared to a microstructured elliptical contact under pure rolling conditions. Due to high pressures in the contact region, elastic deformation of contacting bodies plays an important role. Microstructures influence this deformation, resulting in a local change of the lubricating film geometry. It is shown that for elliptical contacts in condition of pure rolling, no positive effects can be expected. In contrast, the cam-tappet contact shows friction reduction effects on a test rig. Additionally, simulation results show an impact of slide-to-roll-ratio on fluid film formation.