Tensioner

Details Tensioner Tensioner

2005-11-22

2005-11-22

Charles, Marcus (Department: 3682)

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Load responsive tension adjuster or shifter

C474S110000, C474S111000, C474S117000

Reexamination Certificate

active

06966858

ABSTRACT:
A chain tensioner comprising a housing, a plunger having racks formed on its opposite sides, a protrusion biasing spring, cams arranged in oblique guide grooves in the housing and engageable with the racks of the plunger, and a spacer supporting a cam biasing spring. The minimum backlash distance X is equal to h/tan θ, where h is the height of the rack teeth, and θ is the angle of the cam guide surfaces relative to the protruding direction of the plunger. The angle θ is between 15° and 70°. The tensioner prevents wobbling noises produced by a timing chain on starting an engine, prevents whistling sounds due to excess tensioning of the chain, and allows backlash to be readily set to accommodate the requirements of a wide variety of engines.

REFERENCES:
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patent: 1 319 868 (2003-06-01), None
patent: 1319868 (2003-06-01), None
patent: 1323950 (2003-07-01), None
patent: 2 389 404 (2003-12-01), None
patent: 01-229152 (1989-09-01), None
patent: 2000-136861 (2000-05-01), None
patent: 2003-194165 (2003-07-01), None

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