Patent ID: 9610806
Date: 2017-04-04
CPC Classifications: B60C,D02G,D07B

Claim:
1. 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.