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AssigneesNissan Motor Co., Ltd., Hitachi Powdered Metals Co., Ltd.
InventorsAkira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
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A sintered sprocket for a silent chain is obtained from a material with few addition elements by a simple densifying method. The sintered sprocket is made of an ferrous material having an ovarall composition containing Cu at 1 to 2%, C at 0.5 to 0.8%, Mn as an inevitable impurity at 0.10% or less, and balance of Fe and other inevitable impurities by mass and has a density of 7.1 Mg/m3 or higher, 65 HRA or higher as a hardness in the gear teeth, and a martensite, sorbite, bainite, or their mixed structure as a cross-sectional microscopic structure in at least the gear teeth and the peripheral area of the gear teeth.
A sintered sprocket for a silent chain, comprising Cu at 1 to 2%, C at 0.5 to 0.8%, Mn as an inevitable impurity at 0.10% or less, and the balance of Fe and other inevitable impurities by mass, having a density of at least 7.1 Mg/m3, a surface hardness in gear teeth of 65 HRA or higher, and a structure of a martensite, sorbite, bainite, or their mixed structure as a cross-sectional microscopic structure in at least the gear teeth and the peripheral area of the gear teeth.
A production method for a sintered sprocket for a silent chain, comprising steps of
Dependencies are inferred from the claim text.