Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Tension adjuster or shifter driven by electrical or fluid motor
Patent
1994-06-10
1995-01-24
Buiz, Michael Powell
Endless belt power transmission systems or components
Means for adjusting belt tension or for shifting belt,...
Tension adjuster or shifter driven by electrical or fluid motor
474138, F16H 708
Patent
active
053838130
ABSTRACT:
An oil-operated tensioner is constructed with an internal cylinder which receives a rod in such a way that the rod itself serves as a piston, and the diameter of the high pressure chamber formed by the rod and the cylinder is the same as that of the rod. This configuration eliminates changes in the volume of the low pressure oil chamber of the tensioner, maintains substantially constant oil pressure in the low pressure chamber, and substantially reduces the tendency of air to be drawn into the low pressure chamber as a result of flow of oil out of the low pressure chamber when the rod moves in the protruding direction. A piston on the rod in the low pressure chamber, but spaced from the wall of the chamber by a gap, exerts a positive pressure on the oil as the rod moves in the protruding direction to provide further assurance against the entry of air. A valve incorporated into the piston closes as the rod advances and opens when the rod retracts, thereby preventing the piston from causing a negative oil pressure and drawing air past the seal into the low pressure oil chamber.
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Buiz Michael Powell
Tsubakimoto Chain Co.
LandOfFree
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