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
1990-03-14
1991-03-05
Oberleitner, Robert J.
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
049974106
ABSTRACT:
A hydraulic actuating element particularly for a belt tightener having a pressure chamber arranged behind a piston guided in a cylinder, a reservoir separated from the pressure chamber by a check valve, the cylinder and the reservoir being completely oil filled, the outside of the reservoir being defined by a bellows, a leakage gap between the piston and the cylinder being open towards the reservoir and at its one side towards the pressure chamber, whereby a compression spring acts to urge apart the piston and cylinder, characterized in that the reservoir (13) surrounds the cylinder (2) and being limited by the bellows (12) at its outside, the bellows (12) being sealingly secured at one end to a base element (10) secured to the cylinder (2) and at its other end to a base element (11) secured to the piston (1), and that the leakage gap (3) at its other side (17) is externally shielded by the bellows (12) and open to the reservoir (13).
REFERENCES:
patent: 2703019 (1955-03-01), Burawoy et al.
patent: 3626776 (1971-12-01), Staudinger et al.
patent: 3710634 (1973-01-01), Tamaru et al.
patent: 4539001 (1985-09-01), Okabe
patent: 4543079 (1985-09-01), Matsuda et al.
patent: 4674996 (1987-06-01), Anno et al.
patent: 4790801 (1988-12-01), Schmidt et al.
Polster Rudolf
Schmidt Werner
INA Walzlager Schaeffler KG
Oberleitner Robert J.
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