Abstract
Increasing environmental legislation and demands for improved fuel economy performance have resulted in the introduction of various measures to optimize the internal combustion engine. Many of these actions significantly change the operating conditions of the engines and bring with them new challenges that original engine manufacturers (OEMs) have to solve. One example is stop start technology, which changes the operation of many core parts of engines such as journal bearings. Hence, the current paper deals with this topic. In particular, different polymer coated bearings have been studied regarding their friction and wear performance under stop start sliding. Detailed material characterization of the materials was carried out using light microscopy and scanning electron microscopy. Furthermore, tribometric tests were conducted under controlled and similar conditions on a TE92 tribometer using a bearing segment test set up. The results show that the various polymer coated bearings tested provide enhanced friction and wear performance in comparison to other bearing types (e.g., lead-based electroplated) and that friction and wear performance differs also among them. In this regard, a higher amount of solid lubricant fillers and a dense filler structure appears to be beneficial under the given test conditions.
Highlights
Introduction and Research BackgroundJournal bearings are used in engineering to support moving components and to transfer loads.The most prominent representatives are hydrodynamic bearings in internal combustion engines.These engine bearings are placed within the heart of the engine, the crankcase, and support crucial parts such as the crankshaft or connecting rod
The functionality of such bearings relies on two fundamental aspects, viz. sufficient lubrication and design aspects resulting in hydrodynamic film formation as well as suitable bearing materials [1,2]
The latter is addressed with unique solutions for specific applications and material selection has been found to be a compromise between contradicting demands such as fatigue strength and tribological properties, as well as chemical compliance, to name only a few of many [3]
Summary
Introduction and Research BackgroundJournal bearings are used in engineering to support moving components and to transfer loads.The most prominent representatives are hydrodynamic bearings in internal combustion engines.These engine bearings are placed within the heart of the engine, the crankcase, and support crucial parts such as the crankshaft or connecting rod. Sufficient lubrication and design aspects resulting in hydrodynamic film formation as well as suitable bearing materials [1,2] The latter is addressed with unique solutions for specific applications and material selection has been found to be a compromise between contradicting demands such as fatigue strength and tribological properties (i.e., a material needs to be hard and soft at the same time), as well as chemical compliance, to name only a few of many [3]. To meet these requirements, journal bearings are usually designed with a layered structure and heterogeneous materials [4,5,6]. The main layers are defined as steel back for mechanical support, a bearing lining and optional overlay systems
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