TIRE WITH NO BEAD TURNUP

Abstract

A tire having no ply turnup is described. The tire includes a tread, a single layer of ply, and a first triangular shaped bead, wherein the radially inner end of the single layer of ply is secured between the first bead and a second bead, wherein the second bead is formed by spirally winding a strip of reinforcements onto the radially inner end of the ply, wherein the strip is formed of two or more parallel reinforcements.

Claims

1. A tire having no ply turnup, the tire comprising a tread, a single layer of ply, and a first triangular shaped bead, wherein the radially inner end of the single layer of ply is secured between the first bead and a second bead, wherein the second bead is formed by spirally winding a strip of reinforcements onto the radially inner end of the ply, wherein the strip is formed of two or more parallel reinforcements.

2. The tire of claim 1 wherein the second bead is formed from at least two strip windings of the strip of reinforcements.

3. The tire of claim 1 wherein the triangular shaped bead has at least two layers of reinforcement wires.

4. The tire of claim 1 wherein the triangular shaped bead has at least three layers of reinforcement wires.

5. The tire of claim 1 wherein the triangular shaped bead has a fourth layer of reinforcement wires.

6. The tire of claim 1 wherein the triangular shaped bead is formed of reinforcement wires having a diameter in the range of 0.8 to 1.5 mm.

7. The tire of claim 1 wherein the triangular shaped bead is formed from bead wires with a minimum elongation to break of 6%, as measured by ASTM D4975-14.

8. The tire of claim 1 wherein the reinforcement cords of the strip have a diameter in the range of 1.0 to 1.8 mm.

9. The tire of claim 1 wherein the reinforcement cords of the strip is formed from multifilament steel cord reinforcement, with a minimum elongation to break of 4%, as measured by ASTM D2969-04.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The invention will be described by way of example and with reference to the accompanying drawings in which:

[0021] FIG. 1 is a cross-sectional view of a tire with no bead turnup; and

[0022] FIG. 2 is a close-up view of the bead area of the tire of FIG. 1.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0023] FIG. 1 illustrates a tire 10 of the present invention that has no bead turnup. The tire 10 may further include a tread 50, and belts 60,62. The belts 60,62 may comprise conventional belt configurations known to those skilled in the art.

[0024] The tire 10 has a single layer or monolayer of ply 20, that has a radially inner portion 22 that is clamped between a first bead 30 and a second bead 40. The ply layer 20 is comprised of radial cords that may preferably be formed of high modulus 2200/3 denier cords or 3340/2 denier cords. The cord material may be nylon, aramid, or a hybrid construction of nylon/aramid. The lower ply end 22 is clamped between the first bead 30 and the second bead 40. The first bead 30 is a triangular shaped bead. The triangular shaped bead preferably has at least three rows of reinforcement wires, and more preferably four rows of reinforcement wires. The radially innermost row 42 typically has at least four reinforcement wires, while the adjacent third row 44 has three reinforcement wires. The second row 46 has two reinforcement wires, and the first row 48 or radially outermost row has a single reinforcement wire. The reinforcement wire of rows one through four 42,44,46,48 are preferably the same size. The reinforcement wire of the first bead 30 is preferably a 1.3 mm metal wire or with a diameter ranging from 0.8 to 1.5 mm. Preferably, the metal wires of the first bead 30 have a minimum elongation to break of 6% as measured by ASTM D4975-14. The first bead 30 may be pre-formed and then applied onto the tire building drum. An optional first apex 32 may be positioned radially outward of the first bead column 30.

[0025] The tire further includes a second or axially outer bead 40 that functions to clamp the ply ending 22 between the first and second beads 30,40. The axially outer bead 40 is a flexible bead formed of multifilament wire. The axially outer bead 40 is formed by winding a strip of parallel reinforcements of two or more wires. The strip is spirally wound directly onto the ply ending 22 during the tire building process, forming multiple layers that are stacked onto each other. Preferably, the reinforcement cables of the strip may be wire with a diameter ranging from 1.0 to 1.8 mm. It is more preferable that the reinforcement cords of the strip are formed from multifilament steel cord reinforcements with a minimum elongation to break of 4% as measured by ASTM D2964-04.

[0026] Variations in the present invention are possible in light of the description of it provided herein. While certain representative embodiments and details have been shown for the purpose of illustrating the subject invention, it will be apparent to those skilled in this art that various changes and modifications can be made therein without departing from the scope of the subject invention. It is, therefore, to be understood that changes can be made in the particular embodiments described which will be within the full intended scope of the invention as defined by the following appended claims.