HYDRAULIC TENSIONER
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United States of America Patent
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Issued Date -
Dec 27, 2012
app pub date -
Jun 19, 2012
filing date -
Jun 23, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a hydraulic tensioner, the seating surface of a ball-type check valve, used to allow oil to enter the oil chamber of the tensioner while blocking reverse flow of oil, is formed with one or more grooves that allow leakage of oil from the oil chamber to an oil supply passage even when the ball is seated. The groove or grooves can have a decreasing depth or decreasing width, proceeding from the opening of the oil passage of the ball seat toward the oil chamber. Plural grooves can be provided at equal circumferential intervals, and the grooves can be circumferentially inclined. In each case, the groove or grooves improve separation of the ball from the seat, and thereby improve responsiveness of the tensioner to variations in chain tension.
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