Pneumatic tire and manufacturing method of the same
AssigneeToyo Tire & Rubber Co., Ltd.
InventorYuji Inoue
Life of this patent
Estimating the term…
Abstract
A tread rubber of a pneumatic tire is formed by a ribbon rubber which is spirally wound around a tire rotating axis. The ribbon rubber is wound toward one side in a tire width direction from a start point which is positioned closer to a center side than tread ends in a tire meridian cross section, is next folded back to the other side in the tire width direction at the tread end on the one side, is wound toward the tread end on the other side beyond the start point, is next folded back to the one side in the tire width direction at the tread end on the other side, and is wound toward an end point. The ribbon rubber has the winding start end and the winding terminal end at tread end vicinity portions avoiding the tread ends and a tread center portion.
Claims8
A pneumatic tire comprising:
- a tread rubber, the tread rubber being formed by a ribbon rubber which is spirally wound around a tire rotating axis,
- wherein the ribbon rubber is wound from a start point which is positioned closer to a center side than tread ends toward one side in a tire width direction in a tire meridian cross section, is next folded back to the other side in the tire width direction at the tread end on the one side, is wound toward the tread end on the other side beyond the start point, is next folded back to the one side in the tire width direction at the tread end on the other side, and is wound toward a terminal end which is positioned closer to the center side than the tread ends, and
- wherein the ribbon rubber has a winding start end and a winding terminal end in the vicinity of the tread ends avoiding the tread ends and the tread center portion.
A manufacturing method of a pneumatic tire, comprising:
- a tread rubber forming step of forming a tread rubber by spirally winding a ribbon rubber around a tire rotating axis,
- wherein the tread rubber forming step comprises a stage of winding the ribbon rubber from a start point which is positioned closer to a center side than tread ends in a tire meridian cross section toward one side in a tire width direction, next folding back the ribbon rubber to the other side in the tire width direction at the tread end on the one side, winding the ribbon rubber toward the tread end on the other side beyond the start point, next folding back the ribbon rubber to the one side in the tire width direction at the tread end on the other side, and winding the ribbon rubber toward a terminal end which is positioned closer to the center side than the tread ends, and
- wherein the ribbon rubber has a winding start end and a winding terminal end in the vicinity portion of the tread end avoiding the tread end and the tread center portion.
Dependencies are inferred from the claim text.