Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Tension adjuster has surface in sliding contact with belt
Patent
1998-11-09
2000-05-16
Hannon, Thomas R.
Endless belt power transmission systems or components
Means for adjusting belt tension or for shifting belt,...
Tension adjuster has surface in sliding contact with belt
474136, F16H 708
Patent
active
060629991
ABSTRACT:
A backlashless ratchet-type tensioner includes a tensioner housing, a plunger slidably fitted into a plunger accommodation bore formed in the tensioner housing and urged by a spring such that a tip portion of the plunger is projected to the exterior of the plunger accommodation bore, and a ratchet pivotally supported on a ratchet pin provided on the tensioner housing. At least one ratchet pawl formed on the ratchet is meshed with rack teeth formed on an outer surface of the plunger so as to prevent the plunger from receding into the plunger accommodation bore. A 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. The angle between a plane perpendicular to the axis of the plunger and the front face of the ratchet pawl meshed with a rack tooth is slightly smaller than the angle between the plane perpendicular to the axis of the plunger and a rear face of the rack tooth. When the ratchet pawl comes into engagement with a rack tooth, the tip end of the ratchet pawl pushes the rear face of the rack tooth to slightly advance the plunger and hold it in a backlash-eliminated state.
REFERENCES:
patent: 4822320 (1989-04-01), Suzuki
patent: 5006095 (1991-04-01), Suzuki
patent: 5184982 (1993-02-01), Shimaya et al.
Kurohata Junya
Suzuki Tadasu
Hannon Thomas R.
Skillman Henry H.
Tsubakimoto Chain Co.
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