Ring type hydraulic tensioner

Details Ring type hydraulic tensioner Ring type hydraulic tensioner

2005-03-18

2008-09-23

Ridley, Richard W L (Department: 3682)

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

C474S109000

Reexamination Certificate

active

07427250

ABSTRACT:
In a hydraulic tensioner a cylindrical plunger slidably protrudes from a plunger-accommodating hole in a tensioner housing. A check valve unit allows oil to flow under pressure into a high pressure chamber formed by the plunger and the housing, but blocks reverse flow. The plunger is biased in the protruding direction by a spring located in the high pressure chamber. The plunger has an annular groove in its outer circumferential surface, and a C-shaped ring disposed in the groove is resiliently biased radially outwardly against the inner circumferential wall of the plunger-accommodating hole. A radial clearances is provided between the ring and the bottom of the groove, and the ring also fits into the groove with an axial clearance.

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patent: 2003329091 (2003-11-01), None
patent: 2003329091 (2003-11-01), None

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