Patent ID: 8695666
Filing Date: 2014-04-15
Classification: B60C,Y10T

Abstract:
1. A pneumatic radial tire, the tire comprising: a pair of opposing bead portions, each bead portion has a bead core and a bead apex at least one carcass reinforcing ply having radially oriented steel cords, the at least one carcass reinforcing ply has a main portion and two turnups, one turnup extending from each end of the main portion and having a terminal end, the carcass reinforcing ply main portion extends between the opposing bead cores and the turnups are spaced axially outward from the main portion located axially outward of the bead core and a portion of the bead apex; and two pairs of steel cord reinforced chippers, one pair adjacent each turnup, each pair having one inner chipper being adjacent and on an axially inner side of the turnup, the inner chipper extending from a radial end located above and in close proximity to the bead core and being unanchored to the bead core and one outer chipper being adjacent on an axially outer side of the turnup and extending from an axially inner end axially inward of the bead core to axially outward of the bead core, being turned up around the bead core and the carcass ply and anchored to the bead core, the combination of the inner and outer chipper are spaced from the main portion of the carcass reinforcing ply and sandwiching the turnup between the inner and outer chipper, the inner and outer chippers adjacent the turnup extend above the turnup where the inner and outer chippers are joined, each chipper has a terminal end extending radially outward of the terminal end of the turnup causing shear forces to be absorbed in both inner and outer chippers where joined directly above the turnup, and the terminal end of the inner chipper extending beyond the terminal end of the outer chipper and wherein the inner chipper being unanchored to the bead core and joined to the outer chipper above the turnup transfers shear stresses to the anchored outer chipper where joined to the inner chipper above the turnup end of the ply, and wherein the axially inner chipper and axially outer chipper are reinforced by cords of equal, but oppositely oriented cord angles, the cords being inextensible and stiff to insure initial shear stress due to deflection are first taken in the longer end of the axially inner chipper transferred to both inner and outer chippers where joined above the ply turnup end progressing to the outer chipper without unduly loading the turnup due to the chipper cords stiffness and inextensible non-stretching characteristics.