Tire vulcanizing bladder and pneumatic tire

Patent metadata

Field	Value
Publication number	US-11993041-B2
Application number	US-201816772805-A
Country	US
Kind code	B2
Filing date	Jun 14, 2018
Priority date	Dec 20, 2017
Publication date	May 28, 2024
Grant date	May 28, 2024

Abstract

Provided is a tire vulcanizing bladder comprising fluororubber, wherein a plurality of grooves extending in a width direction are formed on a circumference of an outer surface of the tire vulcanizing bladder, and a plurality of recesses connecting the grooves to each other are formed between the grooves. Also provided is a pneumatic tire comprising one or more fluorine-containing particles having a maximum diameter of 1.0 μm or more per area of 100 μm2 of a tire inner surface, wherein a plurality of bladder ridges extending in a tire width direction are formed on a circumference of the tire inner surface, and a plurality of protrusions connecting the bladder ridges to each other are formed between the bladder ridges.

First claim

The invention claimed is:

1. A pneumatic tire comprising one or more fluorine-containing particles having a maximum diameter of 1.0 μm or more per area of 100 μm 2 of a tire inner surface, wherein
a plurality of bladder ridges extending in a tire width direction are formed on a circumference of the tire inner surface,
a plurality of protrusions connecting the bladder ridges to each other are formed between the bladder ridges,
each of the bladder ridges has a height B′ of from 0.3 to 0.5 mm,
each of the bladder ridges does not intersect with any other bladder ridges,
the height B′ of each of the bladder ridges is higher than the height of each of the protrusions,
a ratio B′/D′ satisfies:
0.001≤B′/D′≤0.003 or 0.005≤B′/D′≤0.006, in which D′ (ridges) is a number of the bladder ridges on the whole circumference,
a ratio B′/E′ satisfies:
1.0≤B′/E′≤5.0, in which E′ (mm) is a radius of curvature of a corner of an apex of each of the bladder ridges in a cross section of the bladder ridge in an extending direction,
eight or more and fifteen or less of the bladder ridges are formed per inch along the tire circumferential direction at any position of the tire inner surface in the tire width direction,
the pneumatic tire further comprises a tire inner surface member on the inner surface in a center portion, the center portion being a portion between hump portions in the tire width direction,
the tire inner surface member is disposed in a center region of 80% of a peripheral length in the tire width direction of the tire inner surface of the center portion,
the tire inner surface of the center portion is free of protrusions, and
a number density of small recesses which are defined by the protrusions at a position and in a vicinity of the position of at least a joining portion on a circumference of a carcass ply is greater than that of another position on the circumference of the tire inner surface.

Assignees

• Bridgestone Corp

Inventors

• Oride Junichi
• Oda Yasuhiro
• Matsumura Isao
• Morita Yuya

Classifications

• B29D30/0654 Primary

  Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms (elastic cores or mandrels for shaping of plastics B29C33/505; bags for isostatic pressing in compression moulding B29C43/12, B29C43/3642) · CPC title

• B60C19/002

  Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior · CPC title

• B60C19/12

  Puncture preventing arrangements · CPC title

• B29D2030/0655

  Constructional or chemical features of the flexible cores · CPC title

• B29D2030/0659

  Details or accessories for the flexible cores not otherwise provided for · CPC title