Patent ID: 7766775
Filing Date: 2010-08-03
Classification: F16H

Abstract:
1. A chain tensioner comprising: a housing having a closed bottom at one end thereof; a rod axially movably inserted in said housing for pressing a chain; a wear ring mounted to an outer periphery of said rod; a return spring mounted in said housing and biasing said wear ring in a direction away from said closed bottom of said housing; a nut member mounted in said housing between said wear ring and said closed bottom of said housing so as to be coaxial with said housing and axially movable relative to said housing; a ring-shaped spring member provided between said nut member and said closed bottom of said housing and structured to receive any axial load applied to said nut member in a direction toward the closed bottom of the housing; a screw rod provided between said rod and said closed bottom of said housing and in threaded engagement with said nut member; and a spring provided between said screw rod and said closed bottom of said housing and biasing said screw rod in a direction away from said closed bottom of said housing; said screw rod having an end surface that is in abutment with said rod.