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Hoshina, Takeshi
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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 of Lead-Free Aluminum Alloy Bearing for Automotive Engines

DAIDO METAL Corp.-Yukihiko Kagohara, Takeshi Hoshina, Tomoyuki Nirasawa, Osamu Ishigo, Hideo Nakamura, Akira Ono
  • Technical Paper
  • 2007-08-0284
Published 2007-05-23 by Society of Automotive Engineers of Japan in Japan
Currently, such bearing performances have been especially required on aluminum alloy bearing used in automotive engines, as good conformability and characteristic with less damage on bearing when foreign particles exist in lubricants. To satisfy these technical requirements, new lead-free aluminum alloy bearing was developed and evaluated in rig tests under conditions simulating operations in actual engines. The tests verified that new bearing had superior conformability and exhibited less damage for foreign particles compared to conventional aluminum alloy bearing.
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Development of Lead-Free Aluminum Alloy Bearing With Higher Amount of Silicon

Daido metal Co., Ltd.-Yukihiko Kagohara, Takeshi Hoshina, Mikio Suzuki, Kouji Kuroda
  • Technical Paper
  • 2006-05-0259
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
Al-Sn-Si alloy bearings, widely used as main bearing and con-rod bearing in gasoline and compact diesel engines for passenger car, have such better characteristics as possibility with no overlay due to its conformability of tin, excellent corrosion resistance, reasonable prices and lower contents of lead as one of the hazardous substances for the environment, than conventional copper lead alloy bearings with lead-based alloy overlay.Engine bearings have to exhibit excellent performance of anti-seizure and anti-wear property under further severe condition of higher specific load onto bearings and of thinner oil film formation between bearing and crankshaft in operation caused by satisfying such recent engine requirements as lower fuel consumption and clean exhaust gas for global environment. Especially, recent issue makes clear that wear of the bearing alloy may extraordinarily increase in an engine operated under frequent start-stop condition, adopted from the viewpoint of global environment that causes insufficient oil film formation.Based upon these backgrounds, a new lead-free Al-Sn-Si alloy bearing was developed, which had superior both anti-wear and anti-seizure property to conventional Al-Sn-Si alloy bearing. The…
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Development of Lead-Free Aluminum Alloy Bearing With Higher Amount of Silicon

Daido Metal-Takeshi Hoshina, Yukihiko Kagohara, Osamu Ishigo, Koji Kuroda
  • Technical Paper
  • 2006-08-0039
Published 2006-05-01 by Society of Automotive Engineers of Japan in Japan
Bushes used in component parts for gearbox representatively, have been operated under severe condition in order to provide higher performance and to promote an applying of lead-free material for the bearing alloy from the viewpoint of global environment. A new lead-free Al-Sn-Si alloy bearing was developed with higher amount of silicon, and was concluded to have both superior wear resistance and anti-seizure property compared with conventional alloy.
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Development of Multilayer Aluminum-Tin-Silicon Alloy Bearing for Recent Automotive Engines

Yukihiko Kagohara, Takeshi Hoshina, Osamu Ishigo, Masahito Fujita
  • Technical Paper
  • 2004-08-0442
Published 2004-10-27 by Society of Automotive Engineers of Japan in Japan
Aluminum alloy bearings are widely adopted as main bearings and con-rod bearings in automotive engines. There are following requirements for the bearings in order to satisfy recent engine trend. One is enhancement of their fatigue strength under severe condition, another is to make their wear resistance higher in an engine operated under frequent start-stop conditions. Two types of aluminum bearings have been developed with the respective characteristics and were verified to have the superior performances in actual engines respectively.

Development of Multi-Layer Aluminum-Tin-Silicon Alloy Bearing for Recent Automotive Engines

Daido Metal Co., Ltd.-Yukihiko Kagohara, Takeshi Hoshina, Osamu Ishigo, Masahito Fujita
  • Technical Paper
  • 2004-05-0416
Published 2004-05-23 by Society of Automotive Engineers of Korea in South Korea
Engine bearings have been kept on developing to satisfy such recent engine requirements as longer life, lower fuel consumption by direct injection and higher cylinder pressure, and protection of global environment by adoption of frequent start-stop operation.Al-Sn-Si alloy bearings are widely adopted as main bearing and con- rod bearing in gasoline and compact diesel engines. They have such better characteristics as possibility with no overlay due to its conformability of tin, excellent corrosion resistance, reasonable prices and lower contents of lead as one of the hazardous substances for the environment, than conventional copper-lead alloy bearings with lead- based alloy overlay.However, there are two issues for Al-Sn-Si alloy bearing in the engine, which offer two types of bearings with respective characteristics.Firstly, fatigue may occur on the bearing alloy under severe conditions such as in diesel engines. A new bearing with no lead has been developed by applying solid solution treatment of bimetal, consequently concluded to have the higher fatigue strength, with usual property on Al-Sn-Si alloy bearings.Secondarily, wear of the bearing alloy may extraordinarily increase in…
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Development of Multi-layer Aluminum-Tin-Silicon Alloy Bearing for Automotive Diesel Engine

Daido Metal Co., Ltd.-Yukihiko Kagohara, Takeshi Hoshina, Masayuki Niwa, Masahito Fujita
Published 2003-03-03 by SAE International in United States
Recent engine bearings are operating under severe conditions to support such engine requirements as lower fuel consumption, longer life and protection of global environment. On Al-Sn-Si alloy bearings, it has some issue that fatigue may occur on the bearing alloy under severe condition such as in automotive diesel engines. Higher strength of alloy, which allows the fatigue resistance, can be obtained by solid solution treatment at higher temperature in general. But at the same time it makes intermetallic compounds with less bonding strength between intermediate layer and steel backing. A new bearing without lead has been developed by applying the heat treatment of bimetal and adequate intermediate layer for the process, consequently concluded to have the higher fatigue strength, with usual property on Al-Sn-Si alloy bearings.
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