Metallic reinforcing cord for tyres for vehicle wheels
AssigneePirelli Tyre S.p.A.
InventorsSimone Agresti, Guido Luigi Daghini, Alessandro Ascanelli
Life of this patent
Estimating the term…
Abstract
The invention relates to a metallic reinforcing cord for tyres for vehicle wheels, comprising at least two metallic wires twisted together with a predetermined twisting pitch, wherein the metallic reinforcing cord has a part load elongation greater than 3%, preferably greater than 3.5%.
Claims13
A metallic reinforcing cord for tyres for vehicle wheels,
- comprising at least two metallic wires twisted together with a first twisting pitch (P) greater than, or equal to, 3 mm, wherein the metallic reinforcing cord has a part load elongation greater than 3%,
- wherein the part load elongation is the difference between a percentage elongation obtained by subjecting the reinforcing cord to a traction of 50 N and a percentage elongation obtained by subjecting the reinforcing cord to a traction of 2.5 N and is evaluated with a BISFA E7 method,
- wherein:
- i) the at least two metallic wires are in a number between 2 and 7 and the metallic reinforcing cord has a construction of the n×D type, wherein n is the number of metallic wires twisted together and D is the diameter of the metallic wires, wherein all the metallic wires have the same diameter or different diameters, or
- ii) the metallic reinforcing cord has a construction of the m×n×D type, wherein the at least two metallic wires twisted together form at least one strand of metallic wires, wherein m is the number of strands of metallic wires, n is the number of the metallic wires in each strand of metallic wires, and D is the diameter of the metallic wires, wherein all the metallic wires of the at least one strand of metallic wires have the same diameter or different diameters and the metallic wires of a strand of metallic wires have a diameter equal to or different from that of the metallic wires of another strand of metallic wires.
A metallic reinforcing cord for tyres for vehicle wheels, comprising at least two metallic wires twisted together with a first twisting pitch (P), wherein the metallic reinforcing cord has a part load elongation greater than 3%, wherein the at least two metallic wires comprise at least one first metallic wire which is substantially straight and at least one second metallic wire which is wound on the at least one first metallic wire with a winding pitch equal to the predetermined first twisting pitch.
A metallic reinforcing cord for tyres for vehicle wheels, comprising at least two metallic wires twisted together with a first twisting pitch (P), wherein the metallic reinforcing cord has a part load elongation greater than 3%, wherein the at least two metallic wires define at least one first strand of metallic wires, wherein the at least one first strand of metallic wires is twisted together with at least one second metallic wire with a second twisting pitch (PI) which is equal to or different from the first twisting pitch (P).
Dependencies are inferred from the claim text.