樹脂射出成形品、この樹脂射出成形品を用いた電動工具用のケーシング

Japanese Patent JP6851232

B2

PROBLEM TO BE SOLVED: To provide a technology capable of manufacturing a resin injection molded product in which a cylindrical boss is formed integrally at a low cost without deteriorating appearance quality.SOLUTION: A resin injection molded product 10 has an outer plate portion 11 having an outer surface whose surface side is flat and a cylindrical boss 12 having a bottomed cylindrical shape erected on a rear surface side of the outer plate portion 11 and the outer plate portion 11 and the cylindrical boss 12 are integrally formed by injection molding of resin. The outer plate portion 11 is formed by a thick portion 11a which is a root portion of the cylindrical boss 12 where the cylindrical boss 12 stands up or a thick portion 11a which is a thickened portion in the vicinity of a region of the root portion and a reference thick portion 11b which is a region other than the thick portion 11a and whose wall thickness is thinner than the thick portion 11a. When a thickness dimension of the reference thick portion 11b is A, a thickness dimension of the thick portion 11a is B, and a thickness dimension from a bottom surface of a boss hole 12a of the cylindrical boss 12 to a surface of the outer plate portion 11 is C, then A