Adjustable hydraulic valve lifter

Internal-combustion engines – Poppet valve operating mechanism – Tappet

Reexamination Certificate

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Details

C123S090550, C123S090480

Reexamination Certificate

active

07137374

ABSTRACT:
An adjustable hydraulic valve lifter has a lifter body and an internal cylindrical body. The lifter body has a first longitudinally cylindrical internal bore and a first substantially closed lower end, and the internal cylindrical body is axially slideable and rotatable within the first longitudinally internal bore, forming a first oil chamber. A first spring is positioned to bias the internal cylindrical body away from the lifter body. A first oil flow path permits the flow of oil into the first oil chamber through a first check valve. An oil outlet in the lifter body adjacent the first substantially closed lower end allows oil to escape from the first oil chamber as controlled by an oil control recess in an outer surface of the internal cylindrical body.

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patent: 2003/0051689 (2003-03-01), Schnell

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