Honda Giken Kogyo Kabushiki Kaisha

Mitsunori Arimura

Tadashi Kimura

Yoshiaki Koyama

Mamoru Yoshikawa

Ryuji Shiga

Kouji Yamada

Toshiyuki Shibasaki

Katsunori Tajima

Yoshiaki Itou

Kaoru Mitsuuchi

A metal member to be cast-wrapped by a metal cast article, a manufacturing method thereof and a metal cast article including the metal member cast-wrapped are provided. A hollow cylindrical metal member having an outer surface with projections to be cast-wrapped by a metal cast article is manufactured in such a manner that a hollow cylindrical metal raw materialis inserted in a diehaving a inner peripheral surface with longitudinal grooves of a depth H and a width W, and the hollow cylindrical metal raw materialis subjected to hot-extrusion.

Metal member to be cast-wrapped

A rotor assembly for a screw pump has a light alloy rotor main body having an axially extending central bore. A steel shaft is press-fitted into the central bore. A diametrically extending fixing pin is press-fitted through the rotor main body and the shaft. Friction forces between the rotor main body and the shaft are arranged to be larger on a discharge side of the rotor assembly than on a suction side thereof. The fixing pin is disposed at substantially a central position of entire friction forces in terms of their directions and magnitudes.

Rotor assembly for screw pump

Growing community of inventors

Wako, Japan

Mitsunori Arimura