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US 2018/0133941 A1Published application
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
OwnerYong-Hoon Hur, Young-Chun Kiminventors
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Abstract
An injection apparatus to mold a combined member with excellent performance to a constant-velocity joint boot to seal constant-velocity universal joints. The constant-velocity universal joints are used for smooth operation of a drive shaft which transfers driving power from a differential gear of a vehicle to a hub on which a tire is mounted. An injection method of the combined member of the constant-velocity joint boot. A constant-velocity joint boot manufactured by the injection method of the combined member.
Claims7
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 runners to form an injection structure for the melt resin material, wherein the 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 large-diameter 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 and the outer peripheral surface of the large-diameter tube body;
- 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 small-diameter tube body and the bellows connection tube which are disposed at an upper part of the constant-velocity joint boot;
- 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 through an injection hole of the injection bushing.
4 more elements
A method for injecting a combined member of a constant-velocity joint boot comprising the steps of:
- seating a large-diameter tube body of a constant-velocity joint boot on a purging block, which is mounted in a base mold, to face down so that the large-diameter tube body and a small-diameter tube body of the constant-velocity joint boot are connected with each other through a bellows connection tube;
- moving slide molds of a support mold forward so that an outer peripheral surface of a lower end portion of the bellows connection tube and an outer peripheral surface of the large-diameter tube body are grasped by the slide molds;
- arranging a core mold at the inner central portion of the large-diameter tube body supported by the support mold;
- consecutively forming a first molding space to mold a hemispherical thick protrusion and a second molding space to mold a thin protrusion at an area between an inner surface of the large-diameter tube body and the core mold in a circular form;
- positioning injection gates connected with a sprue of the core mold via runners to be closest to a parting line formed between the inner surface of the large-diameter tube body and a top of a combined member;
- sealing the small-diameter tube body and the bellows connection tube and pressing the constant-velocity joint boot downwardly with a sealing cover diposed at an injection mold so that a bottom surface of the large-diameter tube body comes into a contact with an upper surface of a purging block and a bottom of an injection bushing of the injection mold comes into a contact with an upper surface of the sprue of the core mold;
- positioning an injection apparatus above the injection mold so as to inject a melt resin material supplied through an injection cylinder of the injection apparatus into the first molding space, disposed between the inner surface of the large-diameter tube body and the core mold, and through an injection hole of the injection bushing, the sprue, the runners and the injection gates so that the melt resin material is gradually charged from a bottom of the first molding space and the second molding space, the first and second molding spaces communicating with each other;
- cooling the combined member injection-molded in the first and second molding spaces between the inner surface of the large-diameter tube body and the core mold with a cooler mounted inside the core mold;
- separating the injection apparatus and the injection mold from the support mold to release a sealed state of the small-diameter tube body and the bellows connection tube;
- moving the slide blocks backward to release a support state of the slide blocks relative to the lower end portion of the bellow connection tube and the outer peripheral surface of the large-diameter tube body;
- and
- vertically purging the constant-velocity joint boot, which finishes double injection relative to the combined member, from the core mold by the purging block ascending by an operation of an elevation cylinder mounted on the base mold;
- and
- discharging the constant-velocity joint boot using a discharge loader.
11 more elements
Dependencies are inferred from the claim text.