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
1990-05-23
1991-01-15
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
474138, F16H 708
Patent
active
049850091
ABSTRACT:
A tensioning device for chain or belt drives comprising a damping piston guided in a cylindrical housing and loaded in the chain tensioning direction by a compression spring located in the housing, wherein a high pressure chamber for hydraulic fluid is situated between the housing bottom and the damping piston and is open via a leakage gap formed by the guide bore of the housing and the damping piston and closed with respect to an oil reservoir by a non-return valve, the hydraulic pressure in the high pressure chamber during the operation of the tensioning device being higher in the cold state than in the heated state due to differences in viscosity, characterized in that the high pressure chamber is delimited by an additional piston acting as an overpressure piston on which a second compression spring acts in the direction of the high pressure chamber, the overpressure piston being able to bear against a fixed stop and the spring force of the second compression spring and the effective surface of the overpressure piston are so dimensioned that in the cold state, the overpressure piston is displaceable by the force applied to it by the hydraulic pressure and in the heated state, it is retained at the fixed stop by the second compression spring.
REFERENCES:
patent: 4772251 (1988-09-01), Goppelt et al.
patent: 4792322 (1988-12-01), Goppelt et al.
patent: 4911680 (1990-03-01), Kodama et al.
patent: 4940447 (1990-07-01), Kawashima et al.
Schmidt Dieter
Schuseil Bolko
Bui Thuy M.
INA Walzlager Schaeffler KG
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