Rigidity Reinforcement Ring and Tire Vulcanizing Method Using Same
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsHajime Satoh, Kenta Yamamura
Life of this patent
Estimating the term…
Abstract
Provided is a pneumatic tire vulcanizing method which includes the steps of setting a green tire in a mold, inserting a bladder inside the green tire, and expanding the bladder to press the bladder to an outer side in the tire radial direction and perform vulcanization molding. The bladder is expanded with a rigidity reinforcement ring interposed between an inner circumferential surface of a region of the green tire corresponding to a tread portion and an outer circumferential surface of a region of the bladder corresponding to the tread portion.
Claims23
A rigidity reinforcement ring serving as a cylindrical ring that, when a green tire is set in a mold and a bladder is pressed from an inner side of the green tire to an outer side in a tire radial direction to perform vulcanization molding, is interposed between an inner circumferential surface of a region of the green tire corresponding to a tread portion and an outer circumferential surface of a region of a bladder corresponding to the tread portion;
- a stress required to cause a predetermined amount of tensile deformation in a circumferential direction of the ring being greater than a stress required to cause a predetermined amount of compressive deformation in the circumferential direction.
A rigidity reinforcement ring serving as a ring that, when a green tire is set in a mold and a heating medium is injected inside the green tire and then pressed to an outer side in the tire radial direction to perform bladder-less vulcanization, is disposed so as to come into contact with an entire inner side surface of a region corresponding to that from a tread portion to a bead portion of the green tire;
- a stress required to cause a predetermined amount of tensile deformation in the tread portion and the bead portion of the ring being greater than a stress required to cause a predetermined amount of compressive deformation in the circumferential direction.
Dependencies are inferred from the claim text.