Inextensible high temperature resistant tire

• US 6,026,878 A
• Filed: 05/29/1997
• Issued: 02/22/2000
• Est. Priority Date: 05/29/1997
• Status: Expired due to Term

• Current Assignee: Goodyear Tire & Rubber Company
• Original Assignee: Goodyear Tire & Rubber Company
• Inventors: Zhang, Zhibin, Prakash, Amit, Oare, Thomas Reed
• Primary Examiner(s): Johnstone, Adrienne C.
• Application Number:
  US08/865,448
• Time in Patent Office: 999 Days
• Field of Search: 152/517, 152/555, 152/554, 152/556, 152/454, 152/525, 152/540, 152/541
• US Class Current: 152/454
• CPC Class Codes: B60C 11/00 Tyre tread bands; Tread patterns; Anti-skid inserts
• CPC Class Codes: B60C 11/0332 by the footprint-ground contacting area of the tyre tread
• CPC Class Codes: B60C 15/0018 not folded around the bead core, e.g. floating or down ply
• CPC Class Codes: B60C 15/0045 with ply turn-up up to the belt edges, i.e. folded around the bead core and extending to the belt edges
• CPC Class Codes: B60C 15/0072 with ply reverse folding, i.e. carcass layer folded around the bead core from the outside to the inside
• CPC Class Codes: B60C 15/06 Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
• CPC Class Codes: B60C 15/0607 comprising several parts, e.g. made of different rubbers
• CPC Class Codes: B60C 17/0009 comprising sidewall rubber inserts, e.g. crescent shaped inserts
• CPC Class Codes: B60C 2017/0081 comprising special reinforcing means in the crown area
• CPC Class Codes: B60C 9/04 the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
• CPC Class Codes: B60C 9/08 the cords extend transversely from bead to bead, i.e. radial ply B60C9/07 takes precedence
• CPC Class Codes: B60C 9/18 Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
• CPC Class Codes: B60C 9/20 built-up from rubberised plies each having all cords arranged substantially parallel
• CPC Class Codes: B60C 9/2009 comprising plies of different materials
• CPC Class Codes: B60C 9/22 the plies being arranged with all cords disposed along the circumference of the tyre
• CPC Class Codes: Y10T 152/10864 Sidewall stiffening or reinforcing means other than main carcass plies or foldups thereof about beads

Abstract

A runflat radial ply passenger or light truck pneumatic tire 10 has a carcass 30 reinforced with at least one sidewall insert or filler 42 and one substantially inextensible cord reinforced ply 38, the ply being wrapped about two bead cores 26 and located radially inward of a belt reinforcing structure 36. The sidewall insert or filler 42 is located radially inward of the ply 38. The cord 43 has a minimum modulus E of 10 Gpa and is generally inextensible and less heat sensitive than conventional synthetic cords used in passenger and light truck tires. In one embodiment the ply cords 43 are aramid in another embodiment the cords 43 are steel

Claims

1. A tire having a tread, a belt structure and a carcass radially inward of the tread and the belt structure, the carcass comprising:

one ply reinforced with substantially inextensible cords having a minimum modulus E of 10 GPa, the ply having a pair of turnup ends wrapped around a pair of inextensible bead cores, the carcass having a pair of sidewall structures and in each sidewall structure the carcass has a runflat insert radially inward of the ply and an elastomeric bead filler runflat insert radially above each bead core and located between the one ply and the turnup ends, the filler extending from each bead core radially outward in proximity to the belt structure, wherein the turnup ends extend radially outward to a terminal end lying under the belt structure.

2. The tire of claim 1 wherein the cords maintain greater than the minimum modulus and inextensibility at temperatures of about 100°

C.

3. The tire of claim 2 wherein the cords of the one ply are steel.

4. The tire of claim 3 wherein each of the cords of the one ply has one or more filaments, each filament has a diameter in the range of 0.10 to 0.30 mm.

5. The tire of claim 4 wherein each filament has a tensile strength of greater than 3,000 MPa.

6. The tire of claim 1 wherein the cords of the one ply are metallic.

7. The tire of claim 1 wherein the cords of the one ply are aramid.

8. The tire of claim 1 wherein the sidewalls have a substantially constant cross-sectional thickness.

9. The tire of claim 1 wherein the bead filler runflat insert is made of a dual blend rubber material.

10. The tire of claim 1 further comprising:

a single bias cord reinforced member which is wrapped about the bead core and extends raidally outwardly on each side of the bead filler.