Runflat pneumatic vehicle tyre
DRIVE
December 3, 2014
The invention relates to a pneumatic vehicle tire with emergency run-flat properties, comprising a profiled tread (1), a multi-layer belt assembly (2), an inner liner (4), a carcass (3) which is guided in the bead regions (5, 5') from axially inward to axially outward around tensile-strength cores (6, 6') and core profiles (7, 7') seated on the cores as a carcass upturn (3a, 3a'), and sidewalls (8, 8'), within which at least one reinforcement profile (9, 9') that is crescent-shaped in cross-section and annularly closed over the circumference of the sidewall is arranged. It is the object of the present invention to provide a pneumatic vehicle tire with emergency run-flat properties that exhibits good driving characteristics and adequate air-tightness both in emergency run-flat mode and in normal driving operation, but which, compared with generic run-flat tires, is cost-effective to manufacture. The invention consists in that the inner liner (4), viewed in cross-section, consists of at least two inner liner sections (4a, 4b) touching one another in at least one overlapping region (13) and made of different rubber compounds, wherein the first inner liner section (4a) is arranged radially inward below the tread region and contains a rubber compound A containing halobutyl rubber, and wherein a second inner liner section (4b) lies at least within the cross-sectional height (12) of a reinforcement profile (9) and consists of at least one rubber compound B that is free of halobutyl rubber.
Discussion in the ATmosphere