Fluidic tensioner

Details Fluidic tensioner Fluidic tensioner

1988-03-23

1989-10-17

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

474111, 474138, F16H 708

Patent

active

048743526

ABSTRACT:
A hydraulic ball-type check valve tensioner includes a plunger internally provided with an oil chamber and slidably fitted in a housing in association with a spring biasing the plunger in a protruding direction, and a ball-type check valve between the housing and oil chamber to permit oil flows into the oil chamber while blocking oil flow in the reverse direction. A relief valve includes a sleeve slidably fitted in an auxiliary oil chamber in communication with the oil chamber, a spring biasing the sleeve into a depressed position, and a discharge port to be opened when the sleeve is slided against the biasing spring action. A no-return mechanism includes a rack formed on the outer surface of the plunger, and a ratchet rotatably supported in the housing in meshing engagement with the rack and biased by a spring in a direction opposite to the protruding direction.

REFERENCES:
patent: 3812733 (1974-05-01), Yoshida
patent: 4708696 (1987-11-01), Kimura et al.

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