Patent ID: 6688357
Filing Date: 2004-02-10
Classification: B60C,Y10T

Abstract:
A pneumatic vehicle tire comprising a multi-ply carcass, which extends between two bead cores having associated bead apexes, an arrangement of belt plies provided between the carcass plies and a tread strip and also rubber reinforcing plies arranged in the side wall regions, which take on a supporting function with a deflated tire, wherein a first rubber reinforcing ply is arranged radially inside a first carcass ply, a second rubber reinforcing ply is arranged between the first carcass ply and a second carcass ply, a third rubber reinforcing ply is arranged between the second carcass ply and a third carcass ply, and the three rubber plies have a different height in the radial direction and different thicknesses over the height of the side wall; and wherein the radially inner end regions of all three rubber plies are disposed on the axially inner side of the bead apex, and the ends of the radially innermost, first, carcass ply are led around the respective bead core and are overlappingly connected to the respective end of the outer, third, carcass ply, and the middle carcass ply terminates axially inside the bead apex adjacent to the respective bead core, the tire characterized in that the three rubber reinforcing plies extend, starting from the bead apex region with mutually displaced ends up to and beneath the edge region of the belt arrangement; and the tire further characterized in that all rubber reinforcing plies and also the bead apex consist of the same rubber mixture whose complex modulus of elasticity (E*) of the rubber reinforcing plies and also of the bead apex is the same as or greater than 9 MPa and the tan &dgr; is the same as or smaller than 0.03, measured at 70Â° C., 10 Hz, 10% prestress and 1% double strain amplitude (DSA).