Nissan Motor Company Limited

Hitachi Powdered Metals Co., Ltd.

Other

Yukihiro Maekawa

Takashi Suzuki

Akira Fujiki

Yutaka Mabuchi

Kaoru Eguchi

Takashi Murata

Kei Ishii

Masahiro Omata

Tadayuki Tsutsui

Yoshiki Muto

Takayuki Hirao

Hiroshi Saitou

Masanori Iwamoto

Masahiko Katsu

Takeharu Kuramochi

Haruhiko Suzuki

Takeshi Shimizu

Jyun-ichi Yamada

Sadao Miki

Masato Yamaguchi

Makoto Iwakiri

Yoshimi Sugaya

Katsuhiko Ueda

Masakazu Wada

Jyun-Ichi Yamada

Separators (A,B,) and membrane-electrode assemblies () of a fuel cell stack () are alternately stacked in a guide box (). The separators (A,B,) each have groove-like gas paths (A,B). Powder of an adhesive agent () is adhered in advance to the surfaces of the separators (A,B,), except the gas paths (A,B), through photosensitive drums (A,B) to which the powder is adsorbed in a given pattern. The separators (A,B,) and the membrane-electrode assemblies (), stacked in the guide box (), are heated and compressed by a press () and heaters (C) to obtain a unitized fuel cell stack ().

Fuel cell and production of fuel cell stack

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/mor 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.

Sintered sprocket for silent chain and production method therefor

A sintered sprocket has a high overall density and excellent contact pressure resistance. The sprocket is produced from a sintered alloy selected from the following alloys ((1) to (3)), is densified to have a relative density of 95% or higher in the surface layer of the gear teeth by forming by rolling, having a surface hardness of 700 HV or higher, and is useful for a crankshaft, a cam shaft, a balancer shaft, or a water pump shaft of an internal combustion engine:

A sintered metal sprocket for a silent chain is produced by the following steps. A base mixture is prepared, which contains a powder metallurgical iron powder, a lubricant and a graphite powder. Then, the base mixture is subjected to a compression molding while being heated at above approximately 100&deg; C. thereby to produce a green compact. Then, the green compact is subjected to a sintering at a temperature above approximately 1180&deg; C. For much improving the mechanical performance of the sprocket thus sintered, the same may be subjected to a carbonizing hardening or an induction hardening.

Method of producing sintered metal sprocket and sprocket produced by the method

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Yokohama, Japan

Yukihiro Maekawa