Mazda Motor Corporation

Ken Okazaki

Yasuo Uosaki

Kazuo Satou

Junichi Yamamoto

Katsunori Hanakawa

Hiroshi Asai

Ichiro Kitayama

Kouji Mineshita

Akira Ohtsuka

Yuichi Nishiyama

A cast-iron product has a composition of 4.3-4.9 wt. % Carbon Equivalent (CE), 0.25-0.5 wt. % Chromium (Cr), 0.05-0.12 wt. % Tin (Sn), 0.4-1.2 wt. % Manganese (Mn), 0-0.1 wt. % Phosphorus (P), and 0-0.15 wt. % Sulfur (S), with the balance being Iron (Fe). A brake assembly comprises a sliding element made of such a cast iron, and the sliding element is adapted to slideably contact with a friction element or elements made of non-asbestos material and constitute the assembly. Further, a method of producing a cast iron product comprises the steps of casting a cast iron having a composition of 4.3-4.9 wt. % Carbon Equivalent (CE), 0.25-0.5 wt. % Chromium (Cr), 0.05-0.12 wt. % Tin (Sn), 0.4-1.2 wt. % Manganese (Mn), 0-0.1 wt. % Phosphorus (P), and 0-0.15 wt. % Sulfur (S), with the balance being Iron (Fe), releasing a mold at a temperature not less than A.sub.1 allotropic transformation temperature, and cooling the cast iron at a relatively high cooling rate.

Method of producing cast-iron product

An apex seal consisting of 3.0 to 4.0 wt % of C, 1.5 to 2.5 wt % of Si, 0.3 to 1.0 wt % Mn, 0.05 to 0.3 wt % of P, less than 0.1 wt % of S, 0.005 to 0.025 wt % of Mg or Ce, 0.5 to 2.0 wt % of Cu and/or 0.5 to 3.0 wt % of Ni, 0.4 to 1.0 wt % of Cr, 1.0 to 2.0 wt % of Mo and/or 0.1 to 0.5 wt % of V with the balance of Fe, being formed in the sliding surface portion with a sorbite matrix structure in which carbides are dispersed in a matrix of sorbite and in the matrix portion of the material other than the sliding surface portion with a sorbite structure. The apex seal has an excellent bending strength and wear resistance.

Apex seal for rotary piston engine and method for manufacturing the same

A valve driving mechanism of which a rocker arm is provided at one end portion with a roller brought into a rotative contact with a cam surface of a cam for driving engine valves. The cam consists of 2.0-4.0 wt % of C, 1.5-3.5 wt % of Si, 0.1-1.0 wt % of Mn, 0.005-0.08 wt % of Mg, less than 0.15 wt % of P, less than 0.15 wt % of S, 0.3-1.0 wt % of Cu, 0.03-0.09 wt % of Mo with the balance of Fe, with a matrix of the cam being a granular graphite cast iron having a mixed structure of 30-50 vol % of residual austenite structure and a bainite structure.

Mechanical parts of valve driving mechanism for internal combustion

Spheroidal graphite cast iron whose matrix is composed of a mixture of bainite and retained austenite, containing 250 to 800 graphite grains/mm.sup.2, and its production method comprising the steps of forming the casting, annealing the casting so as to change the matrix to ferrite, machining the casting and subjecting the casting to austempering so as to subject the casting to austenitizing and isothermal transformation.

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Higashihiroshima, Japan

Ken Okazaki