Manufacturing apparatus of resin boot for constant-velocity universal joint and method of manufacturing resin boot for constant-velocity universal joint, and resin boot for constant-velocity universal joint

摘要

There is disclosed a manufacturing apparatus and method which are capable of smoothly removing a tripod boot integrated by secondary molding from a core without deforming the boot and which are superior in manufacturing efficiency and which are inexpensive, and a resin boot for a constant-velocity universal joint. The apparatus includes: divided molds 14a, 14b which hold a primarily molded resin boot main body Pm from the outside; a core 18 which holds the boot main body Pm from the inside; a runner mechanism 26, 28, 30 which injects/charges a molten resin material into a secondary molding space 52 formed between the core 18 and an other-end annular fastening portion P3; and an ejection mechanism 36, 38, 40, 42 for removing the tripod boot Pm in which portions having different thicknesses are integrally and secondarily molded on an inner periphery of the other-end annular fastening portion P3 from the core. The ejection mechanism is provided with a plurality of ejectors 36 in positions avoiding gates 30 of the runner mechanism, and ejecting forces are applied onto lower end surface of the other-end annular fastening portion of the tripod boot from the ejectors to stably and smoothly remove the tripod boot from the core 18.