Resource-efficient piston ring / cylinder liner-pairing

活塞环/缸套对内燃机的摩擦损失和油耗影响很大。根据目前的技术水平，可以通过优化的磨合来调节活塞环/缸套配对，从而在正常运行期间设置非常小的磨损率和低摩擦。这一事实在实践中没有得到执行。因此，磨合时间太长，成本太高，客户无法完成磨合。此外，磨合过程中可能会出现自发故障。此外，磨合过程中在气缸套表面和边界层中发生的过程尚未完全了解。如果有可能在气缸套精加工过程中产生与优化磨合后基本一致的表面形貌和边界层，则无需磨合即可实现低磨损和低摩擦。计划研究项目的目的是根据精加工过程中优化的磨合，调整气缸套的表面和边界层，涉及表面形貌，微观结构，化学成分和强度。与经过优化磨合的表面相比，这种优化的表面具有同样低的磨损率和相对较低的摩擦。这一目标将通过摩擦学和制造技术领域的研究活动的紧密结合来实现。

The piston ring / cylinder liner pairing significantly influences the friction losses and therefore the fuel consumption of combustion engines. According to the current state of the art, it would be possible to condition the piston ring / cylinder liner pairing by an optimized running-in, so that a very small wear rate and low friction during normal operation is setted. This fact is not been implemented in practice. Reasons therefore are, that the running-in is too long, too expensive and can not be done by the customer. In addition, there may be spontaneous failures during running-in. Further, the processes occurring during running-in on the surface of the cylinder liner and in the boundary layers have not yet been fully understood. If it is possible to produce such surface topographies and boundary layers already during finishing of the cylinder liners which correspond largely to those after the optimized running-in, low wear and low friction could be achieved without running-in.The aim of the planned research project is to adjust the surfaces and boundary layers of the cylinder liner, relating to surface topography, microstructure, chemical composition and strength according to the optimized running-in already during finishing. Such optimized surfaces feature equally low wear rate and comparatively low friction compared to surface with an optimized running-in. This goal will be realized through a close integration of research activities in the fields of tribology and manufacturing technology .