Patent ID: 8641565

Claim:
A sprocket adapted to mesh with an associated inverted tooth chain, said sprocket comprising: a plurality of teeth circumferentially spaced about an axis of rotation, each tooth comprising an engaging flank and a disengaging flank, wherein some of said teeth are defined with a first tooth form in which said engaging flank thereof is defined with a first pressure angle and others of said teeth are defined with a second tooth form in which said engaging flank thereof is defined with a second pressure angle that is larger than said first pressure angle; wherein said engaging flank of each tooth defined with said first tooth form is steeper than said engaging flank of each tooth defined with said second tooth form, wherein said steepness of said engaging flank of each tooth is measured relative to a radial tooth center reference line that extends through the axis of rotation and a tooth center of said tooth; and, wherein circumferentially successive teeth of said plurality of teeth are separated by tooth spaces defined by said engaging flank of a first tooth and said disengaging flank of a second tooth, wherein said engaging flank and disengaging flank comprise mirror images of each other such that each of said tooth spaces is symmetrically defined relative to a tooth space center, for all tooth spaces of said sprocket.