Injection apparatus for molding combined member of constant-velocity joint boot, injection method of combined member of constant-velocity joint boot, and constant-velocity joint boot manufactured by injection method of combined member

An injection apparatus of a combined member of a constant-velocity joint boot, comprising:

• a base mold comprising at least one elevation cylinder and a purging block mounted on a rod of the elevation cylinder to be elevated by an operation of the elevation cylinder;
• a core mold comprising a flat upper surface and a molding part upwardly protruding through an inner area of the purging block of the base mold, a sprue mounted at a central point of the flat upper surface to allow a melt resin material to be supplied, a plurality of runners radially mounted around the sprue to extend to the molding part, and injection gates mounted at end portions of the plurality of runners to form an injection structure for the melt resin material, wherein the plurality of runners are downwardly inclined in a direction of the injection gates and the injection gates are located at an upper area of the molding part of the core mold adjacent to a parting line interposed between an outer peripheral surface of the molding part of the core mold and an inner peripheral surface of a first tube body of the constant-velocity joint boot;
• a support mold comprising a pair of slide molds moveable forward and backward in a horizontal direction by a hydraulic cylinder to engage with each other or be separated from each other, and support grooves respectively formed inside the slide molds to grasp an outer peripheral surface of a lower end portion of a bellows connection tube of the constant-velocity joint boot and the outer peripheral surface of the first tube body of the constant-velocity joint boot;
• an injection mold mounted above the support mold, vertically ascendable and descendible by the hydraulic cylinder to come into contact with the support mold or to be separated from the support mold;
• a sealing cover mounted at the central portion of the injection mold and comprises a cover hole upwardly dented to accommodate a second tube body and the bellows connection tube which are disposed at an upper part of the constant-velocity joint boot, the first tube body having a larger diameter than the second tube body;
• and
• wherein the injection mold comprises an injection bushing which vertically crosses a central portion of the cover hole of the sealing cover to supply the melt resin material to the sprue through an injection hole of the injection bushing.