Patent ID: 7789783
Filing Date: 2010-09-07
Classification: F16G,F16H

Abstract:
1. A chain and sprocket drive system comprising: a sprocket with a plurality of teeth, wherein each tooth comprises an engaging flank and a disengaging flank; an inverted tooth chain meshed with the sprocket, said sprocket and chain defining a maximum chordal rise distance CR, and said inverted tooth chain comprising a plurality of rows of inside links that each articulate relative to a preceding row and a succeeding row about pivot axes spaced at a chain pitch P, each of said rows comprising leading inside toe flanks and trailing outside toe flanks, wherein the leading inside toe flanks of each row project outwardly relative to trailing outside toe flanks of the preceding row by a maximum projection amount λ the engaging flank of each sprocket tooth makes initial meshing contact with a meshing link row of said inverted tooth chain only on the leading inside flanks of the meshing link row of said chain; the leading inside flanks of the meshing link row and the trailing outside flanks of a preceding link row move into simultaneous meshing contact with the engaging flank after said initial contact such that said preceding link row is fully meshed with said sprocket when its trailing outside flanks make contact with said engaging flank; said simultaneous meshing contact occurs before a next meshing link row of said chain contacts said sprocket; said leading inside flanks of said meshing link row separate from the engaging flank after said simultaneous meshing contact; and, a strand of said chain located upstream from said sprocket exhibits chordal motion that is no more than 40% of said maximum chordal rise distance CR.