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
1991-04-11
1992-05-26
Bui, Thuy M.
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
474135, 474138, F16H 708
Patent
active
051162849
ABSTRACT:
A tensioner for a power transmission belt or the like includes a housing providing an elongated interior cavity opening out of one end of the housing and a piston positioned within the cavity for movement therealong for dividing at least a part of the interior cavity into first and second variable-volume chambers for holding hydraulic fluid wherein the second variable-volume chamber is closer to the one housing end than is the first variable-volume chamber. The tensioner utilizes a distensible bellows section connected between the piston and the housing for separating the second variable-volume chamber from the cavity opening at one end of the housing. A plunger is connected to the piston and extends out of the one end of the housing, and a spring is interposed between the piston and the housing for biasing the piston toward the one end of the interior cavity so that the plunger is urged out of the one housing end. Flow control passages associated with the first and second variable-volume chambers permit a substantially unrestricted flow of hydraulic fluid from the second variable-volume chamber to the first variable-volume chamber and permit a controlled flow of hydraulic fluid from the first variable-volume chamber to the second variable-volume chamber. Consequently, when the housing is fixed in a stationary condition adjacent a belt to be tensioned and the plunger is positioned for interacting with the belt, oscillatory forces which would tend to flutter or vibrate the belt are dampened and any oscillatory motions experienced by the belt are limited.
REFERENCES:
patent: 4411638 (1983-10-01), Wilson
patent: 4472161 (1984-09-01), Ojima
patent: 4539001 (1985-09-01), Okabe
patent: 4708696 (1987-11-01), Kimura et al.
patent: 4798563 (1989-01-01), Okabe et al.
patent: 4911679 (1990-03-01), Inoue et al.
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