Patent ID: 6062999
Filing Date: 2000-05-16
Classification: F16H

Abstract:
A backlashless ratchet-type tensioner, comprising:a tensioner housing;a plunger slidably fitted into a plunger accommodation bore formed in said tensioner housing and urged by a spring such that a tip portion of said plunger is projected to the exterior of said plunger accommodation bore; anda ratchet pivotally supported on a ratchet pin provided on said tensioner housing;said tensioner being configured such that a ratchet pawl formed on said ratchet is meshed with rack teeth formed on an outer surface of said plunger so as to prevent said plunger from receding into the plunger accommodation bore;whereina front face of the ratchet pawl is formed substantially perpendicular to a straight line which passes through a tip of the ratchet pawl and the center of the ratchet pin; anda first angle between a plane perpendicular to an axis of said plunger and the front face of the ratchet pawl meshed with a rack tooth is slightly smaller than a second angle between the plane perpendicular to the axis of the plunger and a rear face of the rack tooth.