Nichias Corporation

Shota Uchida

Kenichi Nakamura

Yoshifumi Fujita

A resin material is injection-molded using an injection mold in which a resin flow channel is designed so that a plurality of gates are provided along a longitudinal direction at a position corresponding to an inner circumferential surface of a spacer, to obtain a molded product, the spacer having a shape that a plurality of arc-shaped circumferential surfaces are linked through a constricted part. The molded product is cooled in a state in which a runner that is connected to the gates is allowed to remain, and the runner is cut off thereafter. A water jacket spacer is produced by injection molding while achieving excellent moldability, the water jacket spacer being disposed in a water jacket, and controlling the flow of a coolant, the water jacket spacer including a plurality of segments, or having a shape that the water jacket spacer can be partially inserted into the water jacket.

Water jacket spacer production method

A spacer () is injection molded by using an injection molding die having resin flow channels that are designed such that a plurality of gates () are arranged along the longitudinal direction at a position corresponding to the outer peripheral surface of a side wall part () in which a plurality of arc-like peripheral surface parts () are connected through a waist part (). After opening the mold and ejecting the spacer, the spacer is cooled with a runner () being connected to the gate (), and thereafter, the runner () is cut off. As a result, when producing a water jacket spacer that is assembled to the inside of the water jacket and controls the flow of cooling water by injection molding, while producing with a high productivity without being affected by design constraints caused by draft angle, deformation in the post-molding cooling step is prevented.

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Tokyo, Japan

Shota Uchida