Endless belt power transmission systems or components – Positive drive belt
Reexamination Certificate
2004-04-01
2008-08-26
Charles, Marcus (Department: 3682)
Endless belt power transmission systems or components
Positive drive belt
C474S152000
Reexamination Certificate
active
07416500
ABSTRACT:
A sprocket and a roller chain drive system including same are disclosed. The sprocket 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. The A-profile teeth each define a first pressure angle and the B-profile teeth each define a second pressure angle that is at least 5 degrees greater than said first pressure angle so that a minimum separation Δ is defined. The sprocket is defined with added chordal pitch reduction of 0.2% up to 1% relative to the link pitch of the associated roller chain. The sprocket can be defined with root relief and/or can comprise resilient cushion rings. Initial roller contacts made with the A-profile and B-profile teeth are modulated owing to the pressure angle separation and added chordal pitch reduction.
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Young et al., Camshaft Roller Chain Drive with Reduced Meshing Impact Noise Levels, SAE Technical Paper Series Jan. 2003-1666.
Marshek Kurt M.
Young James D.
Charles Marcus
Cloyes Gear and Products, Inc.
Fay Sharpe LLP
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