Development of Warm Compacted and High Temperature Sintered P/M Sprockets for Silent Chain System of DIG(Direct Injection Gasoline) Automotive Engines.

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  • 温間成形と高温焼結を組み合わせたＤＩＧ（直噴ガソリン）エンジン用サイレントチェーンスプロケットの開発
  • オン カン セイケイ ト コウオン ショウケツ オ クミアワセタ DIG チョクフンガソリン エンジンヨウ サイレントチェーンスプロケット ノ カイハツ

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Abstract

The authors have previously reported on the warm compacted and normal temperature (1140°C) sintered P/M sprockets of the roller chain system of non-DIG (normal MPI gasoline) engines. In this new development, the mechanical properties of several warm-compacted and high-temperature sintered P/M steels were investigated. A wear test was also conducted to examine the anti-wear characteristics of these material using dummy engines. Finally, sprockets of silent chain system of DIG engines were developed that can endure sever wear conditions. The base powder used was a hybrid material (Distaloy DC1). It was 2mass% Ni (nickel) and was diffusion bonded to pre-alloy Fe-1.5mass%Mo (molybdenum) powder. The warm compaction was conducted with the powder, die and tools at 130°C. The sintering temperature was 1190°C and heat treatment was also applied to the sprockets.

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