Vehicle Tire Comprising a Layer of Circumferential Reinforcing Elements

Abstract

A tire with a radial carcass reinforcement comprising a crown reinforcement comprising at least one layer of circumferential reinforcing elements distributed axially at a variable pitch. The layer of circumferential reinforcing elements comprises five parts, namely a central part, two intermediate parts and two axially outer parts, the value of the pitch in an intermediate part being less than the value of the pitch in the axially outer part axially separated from the central part by the said intermediate part, and the value of the pitch in an intermediate part being less than the value of the pitch in the central part.

1 . A tire with a radial carcass reinforcement comprising a crown reinforcement comprising at least one layer of circumferential reinforcing elements distributed axially at a variable pitch itself radially crowned by a tread strip, the said tread strip being connected to two beads by two sidewalls, wherein the layer of circumferential reinforcing elements comprises five parts, namely a central part, two intermediate parts and two axially outer parts, wherein the value of the pitch in an intermediate part is less than the value of the pitch in the axially outer part axially separated from the central part by said intermediate part, and wherein the value of the pitch in an intermediate part is less than the value of the pitch in the central part. 
     
     
         2 . The tire according to  claim 1 , wherein the value of the pitch in an axially outer part is greater than the value of the pitch in the central part. 
     
     
         3 . The tire according to  claim 2 , wherein the ratio of the value of the pitch in the axially outer parts to the value of the pitch in the central part is comprised between 1.05 and 4. 
     
     
         4 . The tire according to  claim 2 , wherein the ratio of the value of the pitch in the intermediate parts to the value of the pitch in the central part is comprised between 0.5 and 0.95. 
     
     
         5 . The tire according to  claim 1 , wherein the value of the pitch in an axially outer part is less than the value of the pitch in the central part. 
     
     
         6 . The tire according to  claim 5 , wherein the ratio of the value of the pitch in the axially outer parts to the value of the pitch in the central part is comprised between 0.5 and 0.95. 
     
     
         7 . The tire according to  claim 5 , wherein, the ratio of the value of the pitch in the intermediate parts to the value of the pitch in the central part is comprised between 0.4 and 0.7. 
     
     
         8 . The tire according to  claim 1 , wherein the axial width of the central part of the layer of circumferential reinforcing elements is comprised between 10 and 50% of the axial width of the layer of circumferential reinforcing elements. 
     
     
         9 . The tire according to  claim 1 , wherein the axial width of each of the axially outer parts of the layer of circumferential reinforcing elements is comprised between 7 and 15% of the axial width of the layer of circumferential reinforcing elements. 
     
     
         10 . The tire according to  claim 1 , wherein the axial width of each of the intermediate parts of the layer of circumferential reinforcing elements is comprised between 10 and 38% of the axial width of the layer of circumferential reinforcing elements. 
     
     
         11 . The tire according to  claim 1 , wherein the distribution of the values of the pitch of the layer of circumferential reinforcing elements is symmetric with respect to the equatorial plane of the tire. 
     
     
         12 . The tire according to  claim 1 , wherein the crown reinforcement comprises at least two working crown layers of inextensible reinforcing elements, crossed from one layer to the other making angles comprised between 10° and 45° with the circumferential direction. 
     
     
         13 . The tire according to  claim 1 , wherein the reinforcing elements of the carcass-type reinforcing structure make an angle comprised between 65° and 90° with the circumferential direction. 
     
     
         14 . The tire according to  claim 1 , wherein the crown reinforcing structure comprises at least two layers of reinforcing elements, and in that from one layer to the next, the portions make angles comprised between 20 and 160° with one another. 
     
     
         15 . (canceled)