Nhk Spring Co., Ltd.

Toru Shiraishi

Akihiro Katsuya

A portion of a reinforcing member has a stacked structurein which plural iron plates having openingsare stacked. A hollow portionis formed inside the stacked structure, so that the reinforcing member is reduced in weight. Porous bodiescomposed of non-woven fabric of metal fibers are disposed on surfaces contacting matrixes, so that adhesion between the reinforcing member and the matrix is improved, and peeling therebetween is prevented. A cast product which is composed of light metal and has the above reinforcing member has a small thermal expansion. For example, the cast product is desirable for use for a journal portion of an engine block.

Reinforcing member, production method therefor, and engine block

A composite material member is made of a light metal, and strength and durability in a joined part between constituent materials of the composite material member are improved, and production cost is decreased. The composite material member of the present invention contains a main material composed of a light metal or a light metal alloy which can be molded by casting; and a secondary material composed of a metallic material different from the main material or an inorganic material, the secondary material being joined to the main material by integrally casting with the main material, wherein a porous material is arranged on a part of a boundary area or entire boundary area between the main material and the secondary material.

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Yokohama, Japan

Toru Shiraishi