Deairing type hydraulic tensioner

Details Deairing type hydraulic tensioner Deairing type hydraulic tensioner

2005-10-07

2009-10-27

King, Bradley T (Department: 3657)

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

C474S138000

Reexamination Certificate

active

07608004

ABSTRACT:
In a hydraulic tensioner, a deairing valve unit, for releasing air mixed with oil in the high pressure oil chamber of the tensioner, comprises a check ball, a retainer, which envelops the check ball, but allows the check ball to move freely between an inflow end and an outflow end of a retainer passage, and a cylindrical ball seat press-fit into to a recess formed in a front end of the retainer. The deairing valve unit communicates with an exhaust vent formed in the front end of the plunger. A ball biasing spring is optionally provided to bias the check ball toward the ball seat.

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