Patent ID: 8326514

Claim:
A drive for an internal combustion engine having a predetermined take-up rate (TU) and comprising a drive pulley having a first pitch radius (Rp 1 ), a driven pulley having a second pitch radius (Rp 2 ), a shoe hinged about an axis (A) and a toothed belt which is oil wet and cooperating in contact with a guiding surface of said shoe, being a winding angle (α) of said guiding surface comprised between a maximum value (α′max) and a minimum value (α′min) so that: α max ′ - α m ′ α rif ′ = 4 ⁢ % α n ′ - α min ′ α rif ′ = 1 ⁢ % where: α′ m is the winding angle of a shoe having a guiding surface consisting of a circumference arc having diameter D′ m so that D′ α′max −D′ m =10mm, the take-up rate TU being unchanged; α′ m is the winding angle of a shoe having a guiding surface consisting of a circumference arc of diameter D′ n so that D′ n −D′ α′min =10mm, the take-up rate TU being unchanged; α′rif is the winding angle of a shoe having a guiding surface consisting of an arc of circumference having diameter D′rif equal to the difference between a centre distance (I) of said drive pulley and said driven pulley and the sum of said first and second pitch radius (Rp 1 , Rp 2 ).