Patent ID: 7018312
Filing Date: 2006-03-28
Classification: F16H

Abstract:
1. A chain tensioner provided with a tensioner arm relatively slidably engaged with an outside on a loose side of a transmission chain with an end rockably supported by a fixed structure and coupling a driving sprocket and a driven sprocket and a tensioner lifter supported by a fixed structure for pressing an end of the tensioner arm on the loose side of the transmission chain, wherein the tensioner arm comprises: an elastic band tensioner arm body curved toward the transmission chain, the tensioner arm body being made of a spring steel plate; and a flexible tensioner shoe for covering a front of the tensioner arm body and having a chain guide groove to the front wherein the transmission chain is slidably fitted; and a width of a middle in the longitudinal direction of the tensioner arm body is set to a smaller value relative to a width of each end of the tensioner arm body so that a natural oscillation frequency in the middle of the tensioner arm body is different from the natural oscillation frequency at each of the ends of the tensioner arm body, thereby preventing resonance of the tensioner arm body.