Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Tension adjuster has surface in sliding contact with belt
Patent
1999-04-28
2000-11-14
Bucci, David A.
Endless belt power transmission systems or components
Means for adjusting belt tension or for shifting belt,...
Tension adjuster has surface in sliding contact with belt
474110, 474109, 474138, F16H 700
Patent
active
061463000
ABSTRACT:
A tensioner device for adjusting a tension in a chain wound around two sprockets includes a tensioner lever held in sliding contact with a slack run of the chain, an oil-filled tensioner provided on a stationary member, and a ratchet tensioner provided on the tensioner lever. The oil-filled tensioner includes a piston movable back and forth relatively to a housing attached to the stationary member, and a spring urging the piston in the forward direction. The ratchet tensioner includes a plunger movable in the forward direction relative to a housing formed integrally with the tensioner lever, and a spring urging the plunger in the forward direction. The piston and the plunger are held in face-to-face abutment with each other. The spring of the oil-filled tensioner has a larger spring coefficient than the spring of the ratchet tensioner. With this construction, when a sag of the chain is in excess of the forward stroke of the piston of the oil-filled tensioner, the plunger of the ratchet tensioner moves forward to cover a shortage of forward stroke of the piston. The tensioner device can continue proper tension-adjusting operation over a long period of use of a chain drive mechanism in which it is incorporated.
REFERENCES:
patent: 3252347 (1966-05-01), Seaman
patent: 4863417 (1989-09-01), Kimata
patent: 4874352 (1989-10-01), Suzuki
patent: 5366418 (1994-11-01), Fukushima et al.
patent: 5713809 (1998-02-01), Yamamoto et al.
patent: 5720684 (1998-02-01), Mott
patent: 5931754 (1999-08-01), Stief et al.
Fukuda Shigekazu
Nakakubo Katsuya
Suzuki Tadasu
Bucci David A.
Charles Marcus
Skillman Henry H.
Tsubakimoto Chain Co.
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