PNEUMATIC TIRE

• US 20130160914A1
• Filed: 10/03/2011
• Published: 06/27/2013
• Est. Priority Date: 10/15/2010
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Oba, Ryo
• Granted Patent: US 9,180,741 B2
• Time in Patent Office: Days
• US Class Current: 152/526
• CPC Class Codes: B60C 19/002 Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
• CPC Class Codes: B60C 2009/2219 with a partial zero degree ply at the belt edges - edge band
• CPC Class Codes: B60C 9/18 Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
• CPC Class Codes: B60C 9/22 the plies being arranged with all cords disposed along the circumference of the tyre
• CPC Class Codes: B60C 9/2204 obtained by circumferentially narrow strip winding
• CPC Class Codes: B60C 9/28 characterised by the belt or breaker dimensions or curvature relative to carcass B60C9/30 takes precedence
• CPC Class Codes: Y10T 152/10765 Characterized by belt or breaker structure

Abstract

A pneumatic tire comprises a belt layer 7, a band layer 9, and a noise damper 10 made of a sponge material and attached to a radially inner surface TS of a tread 2. The width WA of the noise damper 10 is of from 40%-70% of a ground contacting width TW of the tread. The band layer 9 has an overlapping portion 12 in which two band plies 9A, 9B are radially overlapped; and the overlapping portion 12 covers an axially outer region of the belt layer 7 with a cover width WB of from 10%-25% the ground contacting width TW. An axially inner end 12i of the overlapping portion 12 is spaced a distance LC of from 5%-20% the ground contacting width TW from an axially outer end E of the noise damper 10.

Claims

1. A pneumatic tire comprising

a carcass extending from a tread portion through a sidewall portion to a bead core of a bead portion,

a belt layer disposed radially outside of the carcass in the tread portion,

a band layer disposed radially outside of the belt layer, and

a belt-like noise damper attached to a radially inner surface of the tread portion and made of a sponge material extending in the tire circumferential direction;

wherein

an axial width WA of said noise damper is in a range of from 40% to 70% of a ground contacting width TW of the tread portion;

said band layer comprises two band plies made of organic fiber band cord spirally wound at an angle of not more than 10 degrees with respect to the tire circumferential direction, wherein the band layer includes an overlapping portion in which said two band plies are radially overlapped each other;

said overlapping portion covers an axially outer region of the belt layer with a cover width WB in a range of from 10% to 25% of said ground contacting width TW of the tread portion;

said overlapping portion has an axially outer end disposed in the same position or axially outwardly of an axially outer end F of the belt layer; and

said overlapping portion has an axially inner end spaced an axial distance LC apart from an axially outer end E of said noise damper, wherein the distance LC is set in a range of from 5% to 20% of said ground contacting width TW of the tread portion.

2. The pneumatic tire as set forth in claim 1, wherein said belt layer comprises

two belt plies each of which comprises steel cords inclined at an angle of from 20 to 30 degrees with respect to the circumferential direction of the tire, and

the belt plies are overlapped each other so that the respective belt cords incline in different directions.