Patent ID: 7901311

Claim:
A belt drive assembly comprising: a belt comprising a body of elastomeric material, a plurality of longitudinal filiform inserts embedded in the body, a plurality of longitudinal ribs extending from an internal surface of said body and alternating with a plurality of longitudinal V-shaped grooves delimited by respective sides, and a plurality of cavities longitudinally spaced at equal distances from each other and extending transversely through said longitudinal ribs, wherein said longitudinal ribs define a height from the bottom of said longitudinal V-shaped grooves to the top of said longitudinal ribs, and said cavities of said belt have a depth equal to or less than the height of said longitudinal ribs; a pulley with multiple grooves comprising a plurality of V-shaped circumferential ribs adapted to receive the longitudinal V-shaped grooves of the belt, and a plurality of teeth located at equal distances from each other along the circumference of said pulley and extending transversely with respect to said V-shaped circumferential ribs; wherein the V-shaped circumferential ribs define a radial height from the bottom of said grooves to the top of said V-shaped circumferential ribs, and the radial height of said V-shaped circumferential ribs is greater than the radial height of said teeth, wherein said V-shaped circumferential ribs in said pulley are delimited by respective sides that engage the sides of the longitudinal V-shaped grooves in said belt to transmit torque by friction coupling between said sides of said V-shaped circumferential ribs and said sides of said longitudinal V-shaped grooves, wherein said teeth of said pulley have a circumferential length smaller than a longitudinal length of said cavities of said belt to engage the cavities with play; and at least one second poly-V pulley without teeth, the at least one second poly-V pulley cooperating with the V-shaped grooves of said belt.