RUN-FLAT TIRE

• US 20200130428A1
• Filed: 06/01/2018
• Published: 04/30/2020
• Est. Priority Date: 06/19/2017
• Status: Abandoned Application

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: HASEGAWA, Keiichi, ARIMA, Masayuki
• Application Number:
  US16/623,765
• Publication Number:
  US 20200130428A1
• Time in Patent Office: Days
• CPC Class Codes: B29D 2030/0683 Additional internal supports to be positioned inside the tyre, as emergency supports for run-flat tyres
• CPC Class Codes: B29D 2030/724 Stiffening the sidewalls, e.g. by using additional inserts, e.g. made of rubber, plastics or other materials
• CPC Class Codes: B29D 30/3028 by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the drum 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 15/0036 with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width
• CPC Class Codes: B60C 15/05 multiple, i.e. with two or more cores in each bead
• CPC Class Codes: B60C 17/0009 comprising sidewall rubber inserts, e.g. crescent shaped inserts
• CPC Class Codes: B60C 2001/0058 Compositions of the bead apexes
• CPC Class Codes: B60C 2001/0083 Compositions of the cap ply layers
• CPC Class Codes: B60C 2015/042 characterised by the material of the core, e.g. alloy
• CPC Class Codes: B60C 9/2204 obtained by circumferentially narrow strip winding

Abstract

A run-flat tire has: a pair of bead cores, each bead core formed by covering a wire with resin; a carcass that straddles the pair of bead cores, and having end portions that are anchored on the bead cores; side reinforcing rubbers that are provided at tire side portions, and that extend in a tire radial direction along an inner surface of the carcass; and a tread that is provided at an outer side, in a tire radial direction, of the carcass.

Claims

1. A run-flat tire, comprising:

a pair of bead cores, each bead core formed by covering a wire with resin;

a carcass that straddles the pair of bead cores, and having end portions that are anchored on the bead cores;

side reinforcing rubbers that are provided at tire side portions, and that extend in a tire radial direction along an inner surface of the carcass; and

a tread that is provided at an outer side, in a tire radial direction, of the carcass.

2. The run-flat tire of claim 1, comprising, at the outer side, in the tire radial direction, of the carcass and at an inner side, in a tire radial direction, of the tread, a belt layer that is formed by covering a cord with resin.

3. The run-flat tire of claim 2, wherein the belt layer is formed by winding the cord in a spiral form along a tire circumferential direction.

4. The run-flat tire of claim 1, comprising:

at the outer side, in the tire radial direction, of the carcass and at an inner side, in a tire radial direction, of the tread, a belt layer that is formed by covering a cord with resin; and

bead fillers that are made of resin and that extend from the bead cores along an outer surface of the carcass toward a tire radial direction outer side.

5. The run-flat tire of claim 1, comprising:

at the outer side, in the tire radial direction, of the carcass and at an inner side, in a tire radial direction, of the tread, a belt layer that is formed by covering a cord with resin; and

bead fillers that are made of resin and that extend from the bead cores along an outer surface of the carcass toward a tire radial direction outer side,

wherein the belt layer is formed by winding the cord in a spiral form along a tire circumferential direction.