Patent ID: 7416500

Claim:
A roller chain drive system comprising: a first sprocket; a second sprocket; a roller chain comprising a plurality of rollers drivingly engaged with said first and second sprockets, said roller chain defining a link pitch P c , wherein: at least one of said first and second sprockets is a random engagement sprocket comprising a first plurality of A-profile teeth formed with a first asymmetric profile and a second plurality of B-profile teeth formed with a second asymmetric profile that is different from said first asymmetric profile; said A-profile teeth each define a first pressure angle that is at least negative three (−3) degrees but not more than ten (10) degrees; said B-profile teeth each define a second pressure angle that is at least six (6) degrees but not more than twenty-three (23) degrees, wherein said second pressure angle is also at least 5 degrees greater than said first pressure angle.