Nippon Piston Ring Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Honda Piston Ring Co., Ltd.

Kiyoshi Yamamoto

Shigeru Urano

Takeshi Hiraoka

Takeshi Sugawara

Yoshiaki Takagi

A sintered alloy for a valve seat comprising, in weight percent, 0.5 to 1.7% C, 0.5 to 2.5% Ni, 3.0 to 8.0% Cr, 0.1 to 0.9% Mo, 1.0 to 3.8% W and 4.5 to 8.5% Co, the balance being substantially Fe provided by a base atomized powder; said alloy containing 8 to 14% by volume of 250 mesh or less C-Cr-W-Co-Fe and Fe-Mo hard grains and 6 to 13% by volume of cells, with the continuous cells being infiltrated by a copper alloy.

Sintered alloy for valve seat

A cylinder liner is provided with a white cast iron layer formed in its inner peripheral surface in an area surrounding the top dead center position of the piston, and a thermally created layer is formed underlying the white cast iron layer. The layers may be simultaneously formed by reheating portions of the substantially finished liner with a high density heat radiation source.

Cylinder liner

A cylinder liner for an internal combustion engine has a white case iron layer formed by remelting and cooling a part or whole of areas of an outer peripheral surface of the cylinder liner. A thermally affected layer is also formed between the white cast iron layer and the parent material. This cylinder liner has improved anti-cavitation properties.

Growing community of inventors

Chiba, Japan

Kiyoshi Yamamoto