【作者】

Rainer Aufischer，Oliver Feng

【摘要】

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。Engine development is being driven by environmental considerations, tightening emission regulations, fuel economy and availability in combination with economical boundary conditions. It is within this framework that new approaches in bearing material, design and production are needed. New engine families with increased firing pressures are designed to fulfil these boundary conditions. The change in bearing loading and rough running conditions can be met by tailor-made bearings with special performance characteristics. The high firing pressure in combination with a much wider pressure range for gaseous fuels in combination with misfiring will on one hand change bearing hydrodynamic loading and on the other hand increase cyclic deformation of the bearing structure. Additional features like robustness of bearing types against disturbances as dirt contamination, oil starvation and corrosion are required in combination with extended oil drain intervals and bearing life. Within 2-stroke applications dimensional growth leads to exceptional high dry turn loads in assembly and to cross production limits of bearing production with standardized and robust production processes. In smaller bearings a concept to combine different bearing layers is used. The whole multi-layer composite with the bearing back for improvement of the assembly situation, the lining material to gain higher fatigue strength without losing all the tribological properties and overlays for short term emergency conditions and to compensate for the loss of tribological performance in other layers was rdesigned. This approach of combining difference performance criteria in different layers or areas is also applied in the Patch-Work bearing for 2-stroke engines. Not only to fulfil the demand for large bearings with standard material production processes, but also to combine different performance characteristics in different bearing areas segments can be combined to larger and more robust bearings. For the beforehand mentioned bearing concepts the working principles are described, internal validation and base production principles are shown.According to the internal test results and the first engine results the development targets have been met.Based on engineering and simulation, the bearings can be adapted to the special conditions in specific engine applications. Development and internal test results as well as engine experience are given together with possible bearing configuration in the publication.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

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