Endless belt power transmission systems or components – Positive drive pulley or guide roll – And additional coaxial surface for engaging same belt in...
Patent
1997-06-19
1999-07-13
Jeffery, John A.
Endless belt power transmission systems or components
Positive drive pulley or guide roll
And additional coaxial surface for engaging same belt in...
474156, F16H 5512
Patent
active
059218789
ABSTRACT:
A unidirectional roller chain sprocket for use primarily in automotive engine chain drive applications which incorporates an asymmetrical tooth for improved noise reduction. The asymmetrical tooth profile incorporates a flank flat which is tangent to an engaging flank radius and a first root radius. The asymmetrical tooth profile also incorporates one or more inclined root surfaces which provide tooth space clearance for maintaining the chain rollers in hard contact with the root surface in the sprocket wrap. The asymmetrical tooth profile further incorporates pitch mismatch wherein the sprocket chordal pitch is less than the chain chordal pitch to facilitate a "staged" roller-tooth contact as a roller moves into full mesh from an initial tangential impact at the flank flat.
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International Standard ISO 606:1994(E), entitled "Short-pitch transmission precision roller chains and chain wheels." (19 pgs.).
DE-vol. 46, Mechanical Design and Synthesis ASME 1992, entitled "On The Dynamic Analysis Of Roller Chain Drives: Part 1--Theory." (pp. 431-439).
Charles Marcus
Cloyes Gear and Products, Inc.
Jeffery John A.
LandOfFree
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