Patent ID: 8425357

Claim:
A V-belt having a number of upper cogs and upper roots with upper pitch and upper curvilinear profile, a number of lower cogs and lower roots with lower pitch and lower curvilinear profile, and a reinforcing tensile layer substantially midway between the upper roots and the lower roots; with the upper profile symmetric and comprising lines (“L”) and arcs (“A”) connected according to the sequence L 1 -A 1 -L 2 -A 2 -L 3 from the center of any of said upper roots to the center of an adjacent cog of said upper cogs; with the lower profile symmetric and comprising lines and arcs connected according to the sequence L 4 -A 3 -L 5 -A 4 -L 6 from the center of any of said lower roots to the center of an adjacent cog of said lower cogs; and with the sum of the length of L 1 plus the radius of A 1 equal to or within 20% of the sum of the length of L 4 plus the radius of A 3 ; and with at least one of said upper roots being substantially aligned with at least one of said lower roots; and wherein the number of said upper cogs is greater than the number of said lower cogs.