Pneumatic tire and method of producing the same

• US 20020050314A1
• Filed: 08/23/2001
• Published: 05/02/2002
• Est. Priority Date: 08/23/2000
• Status: Abandoned Application

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Nakamura, Tsutomu
• Application Number:
  US09/934,580
• Publication Number:
  US 20020050314A1
• Time in Patent Office: Days
• US Class Current: 152/529
• 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.

2. A pneumatic tire according to claim 1, wherein the fiber reinforcing cord is made from a resin material or an inorganic material.

3. A pneumatic tire according to claim 2, wherein the resin material is selected from aromatic polyamide, polyethylene naphthalate, polyethylene terephthalate, rayon and aliphatic polyamide, and the inorganic material is selected from glass and carbon.

4. A pneumatic tire according to claim 1, wherein the two different cords are continuously arranged from an end of the tread to the other end thereof in a widthwise direction.

5. A pneumatic tire according to claim 1, wherein one cord among the two different cords is arranged on both side portions of the spiral belt in the widthwise direction.

6. 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.

7. 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.