Manufacture of bobbin with flange

Abstract

Abstract PURPOSE:To obtain the titled bobbin which has large strength in its axial direction and is superior in balancing performance, by making fusion adherence of a cylindrical reinforcement through friction to a flange and a cylindrical bearing body molded by injecting a resin material radially from a sprue. CONSTITUTION:A metallic bobbin 3 is inserted into a split metallic molding die 13 double-cut, a synthetic resin material is put in the die 13 through pressure from a sprue 17 under a molten state, and a flange 5 is molded by making the synthetic resin material fill within a cavity 15 by injecting the same radially toward an external circumferential direction through a runner 25, a gate 27 and a through hole 11. A flange 7 is molded similarly, and a cylindrical bearing body 57 made of thermoplastic synthetic resin into which a bearing bushing 51 is inserted is inserted into the inside of the bobbin 3 under a press-fit state. A cylindrical reinforcement 67 having tapered joinning surfaces 63, 65 adhering closely to joinning surfaces 59, 61 of the bearing body 57 is inserted into the flange 5 and the bearing body 57 and they are made to unify by making fusion adherence through friction.

Inventors

• 👤 Manji Minoshima
• 👤 蓑島　万治

Bibliographic Details