High strength cord
AssigneeThe Goodyear Tire & Rubber Company
InventorsFarrel Bruce Helfer, Dong Kwang Kim, Robert Martin Shemenski, Italo Marziale Sinopoli, Guy Jeanpierre, Gia Van Nguyen
Life of this patent
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Abstract
Steel reinforcing cords (36) having four or more filaments (38, 40, 42 and 44) in two groups, one twisted and the other untwisted with a filament tensile strength TS equal to K.sub.1 -K.sub.2 D where K.sub.1 =4080N/mm.sup.2, and D is a filament diameter in mm to form cords with a break load equal to N(720.40D.sup.2 -352.6D.sup.3 ; CE is the cord efficiency, D is the filament diameter in millimeters and N is the number of filaments.
Claims5
A cord of the U+T type for reinforcing elastomeric structures with two groups of filaments in the cord, group T being twisted and group U untwisted with the two groups twisted about each other comprising:
- at least two filaments in each group, all filaments having the same pitch and twist direction, said cord made of steel having a cord breaking load (CBL) in pounds defined by the expression:
- CBL=N(720.4D.sup.2 -325.6D.sup.3)CE where CE is cord efficiency in a range of 0.95 to 0.99, D is the filament diameter in millimeters in a range of 0.30 to 0.39 and N is the number of filaments in the cord, said steel for the cord having a composition by weight of between 0.78% and 0.86% to carbon, 0.3% and 1.0% Si and between 0.1% and 0.5% of an alloying element selected from the group consisting of:
- Cr, Ni, Co, W, Mo, V, N6, and any combination thereof with, the balance of the cord position being iron and residuals.
Dependencies are inferred from the claim text.