Pneumatic tires for passenger cars

Abstract

The present invention provides a pneumatic tire for passenger vehicles that can significantly reduce tire weight and rolling resistance without affecting desired tire performance. At least one carcass ply is spanned between a pair of bead parts, a bead core is embedded in each bead part, at least one reinforcing layer is arranged on the outer peripheral side of the carcass ply, and a tread rubber layer is laminated on the outer peripheral side of the reinforcing layer In the pneumatic tire, a pair of first boundary lines orthogonal to the inner surface of the tire are defined by the intersection of the extension line of the side arc and the extension line of the shoulder arc that constitute the tread profile, and a pair of first boundary lines orthogonal to the inner surface of the tire is defined by the rim detection line. For the second boundary line, divide the first area between a pair of first boundary lines, divide the second area between the first boundary line and the second boundary line, divide the third area on the toe side of the second boundary line, divide the first The cross-sectional area (mm2) from the region to the third region is respectively set as SA, SB, and SC, and the edge lengths (mm) along the inner surface of the tire from the first region to the third region are respectively set as a, b, and c, the ratio SA / a, SB / b satisfy the relationship of 7.5≤SA / a≤11.5, 2.0≤SB / b≤6.0.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for a standard mounting tire of a passenger car, and more particularly, to a pneumatic tire for a passenger car that can significantly reduce tire weight and rolling resistance without affecting desired tire performance. Background technique [0002] Pneumatic tires for passenger vehicles generally include: a tread portion extending in the tire circumferential direction and having an annular shape; a pair of sidewall portions arranged on both sides of the tread portion; and a pair of The bead portion is disposed on the inner side in the tire radial direction of these sidewall portions, and has a structure in which a carcass is bridged between the pair of bead portions, a bead core is buried in each bead portion, and a bead core is embedded in each bead portion. A belt layer is arranged on the outer peripheral side of the layer, and a tread rubber layer is laminated on the outer peripheral side ...

AI Technical Summary

Problems solved by technology

[0004] However, the current situation is that the traditional method focuses on individual parts of the pneumatic tire to achieve weight reduction, so the tire weight and rolling resistance cannot be greatly reduced, and the problems that arise when the pneumatic tire is greatly reduced in each area are not fully considered.

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