Inflatable car radial tire with low-rolling resistance tread contour

Abstract

The invention provides an inflatable car radial tire with a low-rolling resistance tread contour. Under the condition that other properties of the tire are not reduced, the purposes of improving the grounding condition, improving the deformation when the tire is in contact with the ground as well as reducing the tire rolling resistance are achieved by improving and controlling the tire tread contour shape. The tire comprises a tread, and the contour of the tread is sequentially divided into a first-section crown arc and a second-section crown arc on a tire radial section from the intersection of a tire equatorial plane and a tire tread contour to a tire crown at the starting part of a tire shoulder; the outer diameter R1 of the first-section crown arc, the outer diameter R2 of the second-section crown arc and the outer diameter R3 of the tire tread contour at the tire shoulder have the following relationship: 0.43<=R1 / R2<=1 and 0.43<=R2 / R3<=1; and the arc length alpha of the first-section crown arc, the arc length beta of the second-section crown arc and the tread width TDW have the following relationship: 0.33<=alpha / beta<=3 and 0.11<=beta / TDW<=0.431. According to the invention, by controlling smooth transition from the tire crown to the tire shoulder, the uniform distribution of stress in the tire grounding process is ensured, the horizontal and longitudinal deformation of the tire in a running process is reduced, and the tire rolling resistance is reduced.

Description

technical field [0001] The invention relates to the technical field of pneumatic tires, in particular to a pneumatic car radial tire capable of reducing rolling resistance and having an improved tread profile. Background technique [0002] Passenger car tire cavities are generally designed with a profile to give the finished tire a three-radius crown area, starting from the centerline with the first radius having the highest value to form the flattest radial tread area in the finished tire, No. Two radii make it possible to achieve the required mold profile drop at the start of the cavity shoulder radius, the second radius has a value between the first radius and a third radius, the third radius being the shoulder radius and allowing a The edge of the progressive ground contact footprint joins a crown area that connects to the sidewall of the tire. [0003] The rolling resistance of a tire, or rolling resistance, is the loss of efficiency due to the elasticity of the tire. ...

AI Technical Summary

Problems solved by technology

Simply reducing rolling resistance is not difficult, but reducing rolling resistance will always sacrifice some performance of the tire. Among the three major performances of tires: wear resistance, rolling resistance, and wet skid resistance, one or two of them are often improved. It will cause the loss of the third performance, so it is technically difficult to solve the problem if you want to achieve all three

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