Pneumatic tire
AssigneeBridgestone Corporation
InventorShinsaku Katayama
Life of this patent
Estimating the term…
Abstract
Provided is a pneumatic tire having at least one carcass layer as a skeleton extending in toroidal shape over a pair of bead portions, at least one belt layer and a tread disposed on an outer side in the radial direction of a crown portion of the carcass. In a tire section in the widthwise direction in state where the tire is assembled to an application rim, ratio BD/BW of radius difference BD between radius at a center portion and radius at an end portion in the widthwise direction of an innermost layer of the belt layer, to width BW of the innermost layer, ranges from 0.01 to 0.04, and ratio TD/TW of radius difference TD between radius at a center portion and radius at an end portion of the tread in the widthwise direction of a tread ground surface, to tread ground-contact width TW, satisfies BD/BW<TD/TW.
Claims8
A pneumatic tire having at least one carcass layer as a skeleton extending in a toroidal shape over a pair of bead portions, a belt including two or more slant belt layers and a tread that are disposed on an outer side in a tire radial direction of a crown portion of the at least one carcass layer, wherein
- in a section of the tire in a tire widthwise direction in a state where the tire is assembled to an application rim,
- a ratio BD/BW of radius difference BD between radius at a center portion and radius at an end portion in the tire widthwise direction of an innermost slant belt layer, to a width BW of the innermost slant belt layer, is in a range of 0.01 to 0.04,
- a ratio TD/TW of radius difference TD between radius at a center portion and radius at an end portion of the tread in the tire widthwise direction of a tread ground surface, to a tread ground-contact width TW, satisfies the relation BD/BW<TD/TW,
- a relation BW>TW is satisfied, the innermost slant belt layer is a layer positioned radially innermost among belt layers having a width greater than or equal to 90% of the tread ground-contact width TW, and
- the ratio TD/TW≥0.05,
- a ratio TGe/TGc of a tread gauge TGe measured in the end portion in the tire widthwise direction of the innermost slant belt layer to a tread gauge TGc measured in a tread center portion is in the range of 0.2 to 0.6.
Dependencies are inferred from the claim text.