Patent ID: 9156316
Filing Date: 2015-10-13
Classification: B60C,Y10T

Abstract:
1. A tire comprising: a carcass-type reinforcing structure formed of reinforcing elements and anchored to beads on both sides of the tire, each of said beads having a base configured to be mounted on a rim seat, said beads being extended radially outwards by sidewalls, said sidewalls being joined radially towards the outside to a tread strip; and a crown reinforcing structure formed under said tread strip and comprising at least two layers of reinforcing elements, wherein said carcass-type reinforcing structure comprises at least two half-layers extending at least from shoulders of the tire to said beads, each of said at least two half-layers having one end under said tread strip, wherein said crown reinforcing structure comprises at least one layer of circumferential reinforcing elements that are distributed in a transverse direction with a variable pitch, wherein said variable pitch between said circumferential reinforcing elements is at a minimum in a region of said at least one layer of circumferential reinforcing elements that radially faces said one end of each of said at least two half-layers of the carcass-type reinforcing structure under said tread strip, and wherein at least one of the following conditions apply: (i) said variable pitch of said circumferential reinforcing elements decreases beginning from one end of said at least one layer of circumferential reinforcing elements and extending to said region radially facing said one end of each of said at least two half-layers under said tread strip, and a value of said variable pitch obeys an arithmetic series of a type U(n)=Uo+nr, where Uo is in a range of 0.4 mm and 2.5 mm, and r is a common difference of said arithmetic series that is in a range of 0.001 and 0.1, and (i) the pitch increases from said region to a crown of the tire, and a value of said variable pitch obeys an arithmetic series of a type U(n)=Uo+nr, where Uo is in a range of 0.4 mm and 2.5 mm, and r is a common difference of said arithmetic series that is in a range of 0.001 and 0.1.