Tire-reinforcing steel cord and radial tire using the same
AssigneeHankook Tire Co., Ltd.
InventorsKwan Woo Jung, Il Yong Park, Kum Kang Hwang, Ill Soon Jang, Ji Wan Lee, Mi Jung Lee
Life of this patent
Estimating the term…
Abstract
Disclosed is a tire-reinforcing steel cord for a radial tire. The tire-reinforcing steel cord has a double layer structure including a first-layer core and a second-layer core provided on the surface of the first-layer core. The first-layer core has an elliptical or rectangular cross section. The tire-reinforcing steel cord can improve processability, fatigue characteristics, and rolling resistance performance of a tire, resulting in improved fuel efficiency. A radial tire using the tire-reinforcing steel cord is also disclosed.
Claims10
A tire-reinforcing steel cord, comprising:
- a first-layer core including two filaments;
- and
- a second-layer core including a plurality of filaments which are twisted around the surface of the first-layer core, wherein the filament of the first-layer core has a substantially elliptical or rectangular cross section, and the filament of the second-layer core has a substantially circular cross section,
- wherein the two filaments of the first-layer core are aligned side-by-side with one another, so that respective major axes of the elliptical cross section of the two filaments are collinearly positioned, or respective longer sides of the rectangular cross section of the two filaments are collinearly positioned, and
- a ratio of a short-axis size to a long-axis size of the two filaments of the first-layer core is in a range of 0.3 to 0.9.
Dependencies are inferred from the claim text.