Patent ID: 6655430
Filing Date: 2003-12-02
Classification: B60C

Abstract:
A high aspect ratio low pressure pneumatic farm tire for off-road use on the drive axle of a tractor having a nominal rim diameter greater than 20 inches and a carcass, the carcass having a radially outer crown portion and being reinforced with one or more cord reinforced plies, the tire comprising:a circumferentially extending tread reinforcement composite structure including a tread having a plurality of widely spaced elongated lugs, each lug having a radial height (h) and a width (w), (w) being less than (h), where the elongated lugs are inclined relative to the circumferential direction at an angle equal to or greater than 30Â°, a belt or breaker reinforcement having two or more cord reinforced layers with cords oriented at an angle of 18Â° or greater relative to the circumferential direction, and one or more low angle cord reinforced layers interposed between the belt or breaker reinforcement and the tread, each low angle cord reinforced layer having cords oriented in the 0Â° to 5Â° range relative to the circumferential direction, the cords of the low angle cord reinforced layer or layers extending at least 360Â° around the tire circumference over the belt or breaker reinforcement; and wherein the tread has a net-to-gross ratio as measured around the circumference of the tread of less than 30%, and the tire has an aspect ratio of 95% or greater wherein the one or more low angle cord reinforced layers have cords made of steel.