Pneumatic tire and method of producing the same

• US 20040123930A1
• Filed: 12/17/2003
• Published: 07/01/2004
• Est. Priority Date: 08/23/2000
• Status: Active Grant

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Nakamura, Tsutomu
• Granted Patent: US 7,165,589 B2
• Time in Patent Office: Days
• US Class Current: 152/531
• CPC Class Codes: B29D 30/1628 by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the core axis, to form an annular element winding and joining, helically in general B29C53/58
• CPC Class Codes: B29D 30/70 Annular breakers
• CPC Class Codes: B60C 2009/2029 with different cords in the same layer, i.e. cords with different materials or dimensions
• CPC Class Codes: B60C 2009/2209 characterised by tension of the cord during winding
• CPC Class Codes: B60C 2200/10 for motorcycles, scooters or the like
• CPC Class Codes: B60C 9/2204 obtained by circumferentially narrow strip winding
• CPC Class Codes: Y10T 152/10783 Reinforcing plies made up from wound narrow ribbons

Abstract

A pneumatic tire comprises a spiral belt formed by spirally winding a cord(s) along a circumferential direction of a torus tread, wherein the spiral belt is comprised of at least one layer constructed with a combination of two different cords each having an initial tension of not less than 50 cN/cord.

Claims

1. In a pneumatic tire comprising a spiral belt formed by spirally winding a cord(s) along a circumferential direction of a torus tread, the improvement wherein the spiral belt is comprised of at least one layer constructed with a combination of two different cords consisting of a steel cord and a fiber reinforcing cord each having an initial tension of not less than 50 cN/cord, and

wherein one cord among the two different cords is arranged on both side portions of the spiral belt in the widthwise direction.

2. A pneumatic tire according to claim 1, wherein one cord among the two different cords is arranged on a central portion of the spiral belt in the widthwise direction.

3. A method of producing a pneumatic tire comprising a spiral belt formed by spirally winding a cord(s) along a circumferential direction of a torus tread, which comprises arranging a double-start type head in a cord winding machine, and simultaneously winding one to five steel cords and one to five fiber reinforcing cords from one end of the tread toward the other end thereof in a widthwise direction through the cord winding machine.