Method of manufacturing pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorMasahiro Oku
Life of this patent
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Abstract
A method of manufacturing a pneumatic tire comprises making a rubber-coated cord-member by coating one or more cords with rubber, and making the tread reinforcement by putting together a plurality of the cord-members around a drum into a cylindrical network of the cords, so that the cords make a first array of cords inclining in one direction with respect to the tire equator and a second array of cords inclining in one direction which is opposite to the cords of the first array with respect to the tire equator. It is possible that the cord-members are woven. It is also possible that the cord-members are not woven and, in the crossings of the cords, one of the two cross cords is curved along the other cord.
Claims12
In a method of manufacturing a pneumatic tire provided in the tread portion with a tread reinforcement, the improvement comprising
- making a rubber-coated cord-member by coating one or more cords with rubber,
- making the tread reinforcement by putting together a plurality of the cord-members around a drum into a cylindrical network of the cords, which cords make a first array of cords inclining in one direction with respect to the tire equator and a second array of cords inclining in one direction which is opposite to the cords of the first array with respect to the tire equator, and
- pressing the cylindrical network of the cords against the drum with an elastic material so that:
- in each of the crossings of the cords, one of the two cross cords curves along the other;
- and
- in the portion other than the crossings, the cords of the first array and the cords of the second array are on the same plane.
A pneumatic tire manufactured by the method according to any of the preceding claims.
A pneumatic tire comprising
- a carcass extending between bead portions through a tread portion and sidewall portions, and
- a tread reinforcement disposed radially outside the carcass in the tread portion,
- said tread reinforcement comprising a cylindrical endless cord-network,
- the cord-network composed of a first array of cords inclined to one direction with respect to the tire equator, and a second array of cords inclined to one direction with respect to the tire equator which is opposed to that of the first array,
- in each of crossings of the cords of the first array and the cords of the second array, one of the two cross cords curves along the other, and in the other portion than the crossings, and cords of the first array and the cords of the second array are on the same plane.
Dependencies are inferred from the claim text.