Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1998-05-29
2000-05-30
Knable, Geoffrey L.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
152554, 152562, 1561307, 156133, B29D 3020
Patent
active
060687215
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a pneumatic tire more specifically to a geodesic tubeless type tire and a method of manufacturing such a tire.
BACKGROUND ART
Geodesic Tires are those tires whose ply cord paths are geodesic lines on the tire surface. John F Purdy, the author of Mathematics Underlying the Design of Pneumatic Tires, copyrighted in 1963, was the Chief Mathematician of the Development Department of The Goodyear Tire & Rubber Company and for 45 years he devoted his life to the mathematics underlying tire design. In Chapter IV of Mr Purdy's book, the entire subject matter discloses the principles of Geodesic tires. The author notes his interest in the geodesic cord path first occurred in 1917 as a student of mathematics. Experiments with geodesic tires first began about 1924.
Purdy discloses that a geodesic tire has many desirable features. Quoting Purdy at page 85 of the book "Its durability is excellent due to the absence of shear forces that in conventional tires result in a separation of rubber from fabric and that contribute to fabric fatigue through the torsion of the cords about their own axis during the shear cycle as the tire flexes. The absence of these same shear forces lower the operating temperature of a geodesic tire from the temperature of conventional tires. Improved durability in the vicinity of the tire bead results from the relatively small angle .alpha. at which the cords approach the bead. In many types of tire subject to large driving torque or to severe brake action, damaging torque buckles appear in the tire sidewalls. These are virtually absent in geodesic tires.
Due principally to the large cord angle over the crown, the geodesic tires provide a very soft ride at inflation pressures common to conventional tires of the same size. The same large cord angle over the crown reduces the lateral stability of the tire somewhat, and its ability to develop lateral thrust against the road when rounding a curve. This in itself might be a serious score against the geodesic tire if it were not for the fact that if inflation pressure is raised to the point where softness of ride approaches that of a conventional tire, lateral stability and cornering ability are as good or better than those of a conventional tire.
The geodesic path represents a long step forward in providing desirable properties in a tire that are possible for design alone to provide.
Geodesic tires have not become commonly known to users of tires largely because they require different procedures in the building of the tire than are required for the easily built conventional tires, and because of the fact that for normal purposes conventional tires are highly satisfactory products. The increasing range of conditions under which tires now operate demands new thinking in the art of design and tires of nonconventional cord path is one of the most important forward steps in meeting unusual requirements. Unfortunately the term geodesic has been flaunted in public in recent time with reference to tires that have no semblance whatever to geodesics. For the term geodesic is a mathematically precise term and a path or a curved surface departing only a little from a geodesic path easily loses the merits of geodesics. The failure to obtain a geodesic path in a tire is often the failure to understand some of the simple mechanics of tire construction.
Therefore, to obtain a given geodesic path in a tire, conventional building practice could be followed if the cord path in the flat ply were that path which pantographic action together with the effect of a prescribed tension would transform to a geodesic path on shaping from building form to mold.
The results of this reasoning have invariably been tires with perfect geodesic paths, conforming perfectly to the requirements that .rho.. cos .alpha.=a constant, .rho.o cos .alpha.o, that cord tension be uniform over the entire cord path, and that shear stresses due to inflation pressure be zero".
Purdy then goes on to describe numerous attempts to build experimental geodesic
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Brayer Randall Raymond
Dyer Dale Kenneth
Prakash Amit
King David L
Knable Geoffrey L.
The Goodyear Tire & Rubber Company
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