Chain tensioning apparatus with temperature-based leakdown

Details Chain tensioning apparatus with temperature-based leakdown Chain tensioning apparatus with temperature-based leakdown

2008-10-09

2011-11-29

Dondero, William E (Department: 3654)

Endless belt power transmission systems or components

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

With sensor for controlling operation of shifter to correct...

C474S109000, C474S110000, C474S111000

Reexamination Certificate

active

08066598

ABSTRACT:
An apparatus for tensioning a chain is provided that compensates for the affect of temperature on oil viscosity by providing, in addition to a continuously open oil leakage path, an additional leakage path open only at lower temperatures when oil is more viscous and leaks at a slower rate. Thus, overall oil leakage at lower temperatures is similar to that at higher temperatures, when the additional leakage path is closed, and the less viscous higher temperature oil leaks at a faster rate from the continuously open oil leakage path. Accordingly, the affect of temperature on hydraulic stiffness of the tensioner assembly is minimized.

REFERENCES:
patent: 5234383 (1993-08-01), Harada et al.

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