The major diameter axis part is continued is formed in the resin piston of on vehicle

摘要

PROBLEM TO BE SOLVED: To provide the good resin piston of an actuator for a vehicle capable of preventing the occurrence of jetting at the time of molding, enhanced in dimensional precision and having no void or sink, and its manufacturing method.;SOLUTION: The resin piston 1 having shaft parts 1a and 1b, flange parts 2, 3 and 4 and a recessed part 7 and movably provided in the cylinder hole 5 formed to a cylinder body 21 is molded by injecting a molten resin in the cavity 16 formed by a plurality of molds 10 having molding surfaces corresponding to the outer peripheral shape of the piston 1. A gate 18 for injecting the molten resin is provided to the parts for molding one end surfaces 4b of the flange parts of the cavity 16. The molten resin is injected in the cavity 16 from the gate 18 to fill the cavity 16 while allowed to collide with the surfaces 12a for forming the other end surfaces 4e of the flange parts of the cavity 16 to mold the resin piston 1.;COPYRIGHT: (C)2005,JPO&NCIPI