Daido Metal Company Ltd.

Yuichi Kumagai

Akiyoshi Imamura

Atsushi Koga

Yohei Takada

A roller including: a main body portion configured to include an outer ring and a rotatable inner ring on an inner circumferential side of the outer ring; and a covering portion disposed on an outer circumferential surface of the outer ring, the covering portion being made of a synthetic resin in which reinforced fibers are dispersed, wherein the covering portion includes a region in which arrangement directions of the reinforced fibers are aligned.

Roller

Disclosed is a sliding bearing having a cylindrical shape, including: a Fe alloy back metal layer on an outside diameter side of the cylindrical shape and a sliding layer on an inside diameter side; and a first and second circumferential direction end surfaces, the first and the second circumferential direction end surfaces facing each other, a plurality of hardened convex portions projecting toward the second circumferential direction end surface being formed on the first circumferential direction end surface, a plurality of hardened concave portions corresponding to the plurality of hardened convex portions being formed on the second circumferential direction end surface, a first hardened area being formed on each of the hardened convex portions of the first circumferential direction end surface and its vicinity, and a second hardened area being formed on each of the hardened concave portions of the second circumferential direction end surface and its vicinity.

Sliding bearing

Disclosed is a bearing device including: a bearing housing made of an Al alloy and having a bearing holding hole; a sliding bearing having a cylindrical shape and forced into the bearing holding hole; and a shaft supported with an inner circumferential surface of the sliding bearing, wherein in the sliding bearing to be forced into, a plurality of hardened convex portions projecting toward the second circumferential direction end surface being formed on the first circumferential direction end surface, a plurality of hardened concave portions corresponding to the plurality of hardened convex portions being formed on the second circumferential direction end surface, a first hardened area being formed on each of the hardened convex portions of the first circumferential direction end surface and its vicinity, and a second hardened area being formed on each of the hardened concave portions of the second circumferential direction end surface and its vicinity.

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Inuyama, Japan

Yuichi Kumagai