Fluidic tensioner

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

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Details

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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