Ratchet-type hydraulic tensioner

Details Ratchet-type hydraulic tensioner Ratchet-type hydraulic tensioner

2005-04-05

2005-04-05

Bucci, David A. (Department: 3682)

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Load responsive tension adjuster or shifter

C474S101000

Reexamination Certificate

active

06875141

ABSTRACT:
In a ratchet-type hydraulic tensioner for use with a timing chain of an internal combustion engine, two or more oil reservoirs gradually receive oil fed under pressure from an external source, and supply the oil through a hydraulic valve mechanism to a high pressure oil chamber formed by a plunger and a housing in which the plunger is slidable. Throttle holes, formed in partition walls separating the reservoirs, control the flow of oil from one reservoir to another. An excess oil discharge hole is optionally provided in one of the reservoirs. The invention prevents abnormal protrusion of the plunger, reduces chain noise and component damage due to wear, and rapidly re-establishes proper tension on engine start-up.

REFERENCES:
patent: 4822320 (1989-04-01), Suzuki
patent: 5090946 (1992-02-01), Futami et al.
patent: 5277664 (1994-01-01), Mott
patent: 5441457 (1995-08-01), Tsutsumi et al.
patent: 5954159 (1999-09-01), Nakamura
patent: 6213073 (2001-04-01), Iwata
patent: 2001-208150 (2001-08-01), None

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