Tire vulcanization mold and pneumatic tire

Patent metadata

Field	Value
Publication number	US-2018169984-A1
Application number	US-201715730122-A
Country	US
Kind code	A1
Filing date	Oct 11, 2017
Priority date	Dec 16, 2016
Publication date	Jun 21, 2018
Grant date	—

Abstract

A tire vulcanization mold including a sector mold divided into a plurality of pieces along a circumferential direction of a green tire, the sector mold configured to vulcanization mold a tread portion of the green tire into a predetermined shape, and an upper mold and a lower mold disposed on both sides of the green tire so as to sandwich the green tire therebetween in an axial direction of the green tire, the upper mold and the lower mold configured to vulcanization mold a side portion of the green tire into a predetermined shape. The sector mold has a relief groove in a vicinity of a fitting portion between the sector mold, and the upper mold and the lower mold.

First claim

What is claimed is:

1 . A tire vulcanization mold comprising:
a sector mold divided into a plurality of pieces along a circumferential direction of a green tire, the sector mold configured to vulcanization mold a tread portion of the green tire into a predetermined shape; and a pair of side molds disposed on respective sides of the green tire so as to sandwich the green tire therebetween in an axial direction of the green tire, the side molds configured to vulcanization mold a side portion of the green tire into a predetermined shape; wherein the sector mold has a recess in a vicinity of a fitting portion between the sector mold and the side molds.

2 . The tire vulcanization mold according to claim 1 , wherein the recess has a depth of 0.3 mm or more and 0.5 mm or less.

3 . The tire vulcanization mold according to claim 1 , wherein the recess is provided away from the fitting portion by a distance of 0.5 mm or more and 0.8 mm or less.

4 . The tire vulcanization mold according to claim 2 , wherein the recess is provided away from the fitting portion by a distance of 0.5 mm or more and 0.8 mm or less.

5 . The tire vulcanization mold according to claim 1 ,
wherein the sector mold is provided with a projection for forming a lug groove on an outer circumferential surface of the green tire, wherein the recess is provided away from the projection by a distance of 0.5 mm or more and 0.8 mm or less.

6 . The tire vulcanization mold according to claim 2 ,
wherein the sector mold is provided with a projection for forming a lug groove on the outer circumferential surface of the green tire, wherein the recess is provided away from the projection by a distance of 0.5 mm or more and 0.8 mm or less.

7 . The tire vulcanization mold according to claim 3 ,
wherein the sector mold is provided with a projection for forming a lug groove on the outer circumferential surface of the green tire, wherein the recess is provided away from the projection by a distance of 0.5 mm or more and 0.8 mm or less.

8 . The tire vulcanization mold according to claim 4 ,
wherein the sector mold is provided with a projection for forming a lug groove on the outer circumferential surface of the green tire, wherein the recess is provided away from the projection by a distance of 0.5 mm or more and 0.8 mm or less.

9 . The tire vulcanization mold according to claim 1 , wherein the recess is a plurality of grooves in a mesh shape extending in a direction intersecting with both a circumferential direction and a radial direction of the green tire.

10 . The tire vulcanization mold according to claim 2 , wherein the recess is a plurality of grooves in a mesh shape extending in a direction intersecting with both a circumferential direction and a radial direction of the green tire.

11 . The tire vulcanization mold according to claim 3 , wherein the recess is a plurality of grooves in a mesh shape extending in a direction intersecting with both a circumferential direction and a radial direction of the green tire.

12 . The tire vulcanization mold according to claim 4 , wherein the recess is a plurality of grooves in a mesh shape extending in a direction intersecting with both a circumferential direction and a radial direction of the green tire.

13 . The tire vulcanization mold according to claim 1 , wherein the recess is a groove extending annularly in a circumferential direction of the green tire.

14 . The tire vulcanization mold according to claim 2 , wherein the recess is a groove extending annularly in a circumferential direction of the green tire.

15 . The tire vulcanization mold according to claim 3 , wherein the recess is a groove extending annularly in a circumferential direction of the green tire.

16 . The tire vulcanization mold according to claim 4 , wherein the recess is a groove extending annularly in a circumferential direction of the green tire.

17 . A pneumatic tire comprising:
a protrusion-shaped mold fitting mark located between a tread portion and a side portion, and a protrusion-shaped molding mark provided in a vicinity of and outside of the mold fitting mark.

Assignees

• Toyo Tire & Rubber Co

Inventors

• Ueno Tomonori

Classifications

• B29D2030/0612

  Means for forming recesses or protrusions in the tyres, e.g. grooves or ribs, to create the tread or sidewalls patterns · CPC title

• B29D30/0629 Primary

  with radially movable sectors · CPC title

• B29D2030/063

  the moulds being split in upper and lower halves · CPC title

• B29D30/0662

  Accessories, details or auxiliary operations · CPC title

• B29D2030/0667

  Circulating the fluids, e.g. introducing and removing them into and from the moulds; devices therefor · CPC title