Hydraulic 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

Reexamination Certificate

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Reexamination Certificate

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07427249

ABSTRACT:
In the check valve unit of a hydraulic tensioner a check ball guide has an inner wall surrounding a check ball. This wall is provided with a plurality of oil communicating grooves, formed by cutting away parts of the inner wall of the guide. These grooves carry oil past the ball from the oil supply toward a high pressure oil chamber of the tensioner, when the ball moves away from its seat.

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