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
1993-06-10
1994-05-24
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
F16H 708
Patent
active
053143884
ABSTRACT:
In an oil-operated tensioner for applying tension to a power-transmitting chain, a ball check valve is positioned above the oil chamber, either in the tensioner housing, or in the plunger. The ball of the check valve can oscillate when air is present in the oil chamber, since air is compressible. Oscillation of the ball, which occurs when the plunger oscillates during operation of the tensioner, allows the residual air to be discharged from the oil chamber. However, after the air is discharged, oscillation of the plunger is restrained by the incompressibility of the oil, and oscillation of the ball is restrained by the viscosity of the oil which then surrounds the ball. The valve seat of the check valve preferably opens upwardly so that oil splash is accumulated in the valve seat to prevent entry of air through the check valve upon sudden projecting movement of the plunger.
REFERENCES:
patent: 4504251 (1985-03-01), Mittermeier
patent: 4507103 (1985-03-01), Mittermeier
patent: 4881927 (1989-11-01), Suzuki
patent: 5087225 (1992-02-01), Futami et al.
patent: 5234383 (1993-08-01), Harada et al.
Sakamoto Kiyotaka
Suzuki Tadasu
Bui Thuy M.
Tsubakimoto Chain Co.
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