Tensioner for endless transmission belt

Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Load responsive tension adjuster or shifter

Reexamination Certificate

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Details

C474S110000, C474S111000

Reexamination Certificate

active

08002656

ABSTRACT:
A tensioner for an endless transmission belt includes a plunger body and a plunger. The plunger is movably provided in the plunger body to press the endless transmission belt. A pressure chamber provided between the plunger and the plunger body is configured to store hydraulic oil supplied from an oil pump. A check valve is provided in the plunger body, configured to be opened to supply the hydraulic oil to the pressure chamber when a pressure in the pressure chamber is lower than an oil pressure from the oil pump, and configured to be closed when the pressure is higher than the oil pressure. A relief valve is provided in the plunger body within a width of the plunger in a direction orthogonal to a longitudinal direction of the plunger and configured to discharge the hydraulic oil in the pressure chamber when the pressure exceeds a predetermined value.

REFERENCES:
patent: 7070528 (2006-07-01), Emizu et al.
patent: 7108621 (2006-09-01), Ullein et al.
patent: 7699730 (2010-04-01), Emizu et al.
patent: 7775924 (2010-08-01), Koch
patent: 2003/0216202 (2003-11-01), Emizu et al.
patent: 2006/0063625 (2006-03-01), Emizu et al.
patent: 2009/0197722 (2009-08-01), Emizu et al.
patent: 2000-170855 (2000-06-01), None

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