Patent ID: 6736744
Filing Date: 2004-05-18
Classification: F16H

Abstract:
A sprocket for use with a roller chain having roller members of a pre-selected radius and located with centers at a chain pitch distance apart, the sprocket having a sprocket pitch circle corresponding to the pre-selected roller chain pitch and comprising:a plurality of teeth spaced about an outer periphery of said sprocket; roots defined by the sprocket between adjacent teeth, each of said roots defining an arc joining adjacent teeth and having a tooth root radius equal to the distance from said root to a point on the sprocket pitch circle substantially centered between teeth adjacent to the root, said tooth root radius being larger than said pre-selected radius of said roller members by at least approximately chordal rise and fall of the chain on the sprocket whereby radial impact between said roller members and said sprocket is substantially prevented and the roller members do not contact the root when seated on the sprocket in driving contact.