Patent ID: 7585239
Filing Date: 2009-09-08
Classification: F16G

Abstract:
1. In combination with a pair of spaced-apart sprockets having projecting teeth with a given thickness, and at least one arc-shaped chain guide between said sprockets, said chain guide having a sliding curved surface, a transmission chain comprising bushings press-fitted in a pair of inner link plates and connecting pins press-fitted in a pair of outer link plates, the pins being fitted into the bushings with a selected measurable clearance C greater than zero to permit rotation of said bushings on said pins, said pins having a chain pitch of P 1 , said chain adapted to travel between said pair of spaced-apart sprockets and along said arc-shaped chain guide sliding curved surface, said bushings being spaced apart and dimensioned to engage between the teeth of the sprockets to drive the chain, said inner and outer link plates being spaced apart a distance greater than said given thickness to straddle the teeth of the sprockets, and having guide-opposing-side peripheral edge portions adapted to travel along the sliding curved surface of the chain guide, wherein each of said guide-opposing-side peripheral edge portions being a curved surface, said curved surface of one of said outer and inner link plates having a first curve width X in the longitudinal direction of said chain, said width satisfying Equation 1, and the curved surface of the other of said outer and inner link plates, having a second curve width Y, said width satisfying Equation 2,