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Amano, Seiji
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Development of High Strength Aluminum-Zinc-Silicon Alloy Bearing with Polymer Overlay

Daido Metal Co., Ltd.-Takeshi Hoshina, Seiji Amano, Motohiko Koushima, Kei Ishikura
Published 2019-04-02 by SAE International in United States
Recent automotive engine developments have made great progress in protecting the global environment and in meeting exhaust gas regulations and fuel economy regulations. As a result, engine bearings tend to be used under severe conditions such as higher specific load onto the bearings and with low viscosity of lubricating oil. Aluminum alloy bearings are widely adopted as main bearings and connecting rod bearings in gasoline and diesel engines for passenger cars, and generally Al-Sn-Si alloy bearings without an additional overlay are used. Although these Al-Sn-Si alloy bearings have good anti-seizure properties and excellent running-in-properties, their material strength under high temperature conditions is not sufficient because of the low melting point of Sn phase contained in the alloy, and they could potentially result in damage to the bearing as seizure and fatigue under these conditions.In such cases, Cu-Pb-Sn alloy bearings with lead-based overlay are usually applied. On the other hand Al-Zn-Si alloy bearings with bismuth overlay are also becoming to be applied from the view point of superior corrosion resistance and lower cost. This means that…
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Development for Polymer Overlay Bearing Material for Recent Automotive Engine

Daido Metal Co. Ltd.-Kenji Nimura, Hiroki Kobayakawa, Motohiko Koushima, Seiji Amano
Published 2018-04-03 by SAE International in United States
The number of vehicles with engines using idling stop systems and hybrid systems to improve fuel consumption has recently been increasing. With idling stop systems the engine is switched off when waiting at city traffic lights or stopping on the road, suppressing the fuel usage which leads to improved fuel consumption. However, with such systems the frequent starts and stops of the engine, where the oil film between the bearings and shaft is squeezed out and direct contact between the components is more likely to occur, can result in increased wear of the engine bearings. As a countermeasure, recent engine bearings can have thin coatings based on polymeric resin material (polymer overlays) applied to the bearing surface, which are known to have good bearing properties such as wear resistance and low friction characteristics. In addition to the use of idling stop systems, certain automotive engines are also designed with increasingly high power output, which of course increases the applied load on the engine bearings, and therefore bearing materials that can withstand such high loads are…
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Development of Resin Overlay Bearing Material for Recent Automotive Engine

Daido Metal Co., Ltd.-Erina Yasuda, Hiroki Kobayakawa, Seiji Amano, Yuto Otsuki, Tomohiro Ukai
Published 2017-03-28 by SAE International in United States
The number of vehicles with engines using idling stop systems and hybrid systems to improve fuel consumption has recently been increasing. However, with such systems the frequent starts and stops of the engine, where the oil film between the bearings and shaft is squeezed out and direct contact between the components is more likely, can result in increased wear of the engine bearings, particularly in the main bearing. Bearings with resin overlays have been shown to display superior resistance to wear from such start-stop cycles.Moreover, cast iron shafts without quenching treatment have also been used in engines for cost reduction. Because the cast shaft has low hardness and unstable surface graphite after abrasive finishing, increase in the wear amount cannot be suppressed by conventional resin overlay in comparison with steel shaft. Therefore, the resin overlay with improved wear resistance achieved by adding hard particles was developed. However, the seizure resistance is reduced compared with the previous resin overly because resin overlays with hard particles don’t reform the oil film so readily due to their increased…
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