Panasonic Corporation

Shouichi Irie

Suguru Nakao

Makoto Iyoda

An injection moldincludes a first portion, a second portion, a third portion, and a fourth portion. The first portionhas three high-density regions H in which there is the highest proportion of the axial direction dimension accounted for by the portion corresponding to cam grooves with respect to the axial direction dimension of a cavity. First gatesare disposed at locations corresponding to the high-density regions H, or closer to the high-density regions H than second gates. The average channel sectional area of first runnersis larger than the average channel sectional area of second runners

Cylindrical molded article, injection mold and manufacturing method of cylindrical molded article

A drive frameas a cylindrical molded article has a drive frame main body, three first cam grooves, three second cam grooves, three high-density regions H, and three cam pins. The cam pinsare disposed in the circumferential direction between first center lines Xwhich are positioned in the center in the circumferential direction between adjacent high-density regions H, and the high-density regions H.

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Osaka, Japan

Shouichi Irie