Tire comprising working layers having an improved architecture

A tire, comprising:

• a tread which is adapted to come into contact with the ground via a tread surface comprising grooves;
• each groove forming a space opening onto the tread surface and being delimited by two main lateral faces connected by a bottom face;
• each groove having a width W defined by the mean distance between the two lateral faces and a depth D defined by the maximum radial distance between the tread surface and the bottom face;
• at least one said groove, referred to as a major groove, having a width W at least equal to 1 mm and a depth D between 4 mm and 7 mm;
• the tire further comprising a crown reinforcement radially on the inside of the tread, and comprising a working reinforcement and a hoop reinforcement;
• the working reinforcement comprising at least one working layer;
• the at least one working layer extending radially from a radially inner surface to a radially outer surface;
• and
• the at least one working layer comprising reinforcing elements which are continuous from one axially outer edge of the working layer to the opposite axially outer edge, at least partially made of metal coated in an elastomer material, mutually parallel and which with the circumferential direction of the tire form an oriented angle the absolute value of which is at least equal to 15° and at most equal to 50°;
• the hoop reinforcement comprising at least one hooping layer, the at least one hooping layer comprising reinforcing elements which are continuous from one axially outer edge of the radially outermost working layer to the opposite axially outer edge of the radially outermost working layer,
• wherein the radially outermost working layer comprises at least one undulation,
• wherein the at least one undulation in the radially outermost working layer is arranged such that the working layer portion of the undulation is radially on the outside of the points of the working layer that are in line with the centre of the bottom face of a major groove closest to said undulation,
• wherein the at least one undulation in the radially outermost working layer is such that, over at least 10% of the radially outer surface of said working layer, the radial distance, between the radially outer surface of the radially outermost working layer and the tread surface, is at least 1 mm less than the radial distance between the radially outer surface of the radially outermost working layer and the tread surface, which is the distance in line with the centre of the bottom face of the major groove closest to said undulation,
• wherein the at least one undulation is arranged axially between the major groove closest to said undulation and a centerline of the tread,
• wherein the at least one undulation comprises a first portion that extends radially towards the tread surface and a second portion that extends radially away from the tread surface, and
• wherein the minimum radial distance between the radially outer surface of the radially outermost layer of the crown reinforcement and the tread surface is at most equal to the depth D of the closest major groove, increased by 2 mm.