Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate
2005-05-02
2008-09-09
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Tappet
C123S090500, C123S090520, C123S090550, C137S539000
Reexamination Certificate
active
07421994
ABSTRACT:
An improved hydraulic lash adjuster including a cup-shaped adjuster body, and a plunger assembly disposed within the adjuster body. The plunger assembly includes a stepped axial bore extending from a body inner end to a central oil passage opening onto a hemispherical pivot head. A check valve cartridge sub-assembly is disposed against the step, defining a low-pressure oil chamber in the axial bore. A lash adjustment spring is disposed against the cartridge sub-assembly in a high-pressure chamber formed between the sub-assembly and the adjuster body. The cartridge sub-assembly may be used in other hydraulic lash adjusters such as are incorporated in hydraulic valve lifters.
REFERENCES:
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patent: 5509385 (1996-04-01), LaVieri
patent: 5622147 (1997-04-01), Edelmayer
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patent: 03130506 (1991-06-01), None
Harris Wayne S.
Roe Richard B.
Delphi Technologies Inc.
Denion Thomas
Riddle Kyle M
Smith Michael D.
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