Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate
2006-11-21
2006-11-21
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Tappet
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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Denion Thomas
Eshete Zelalem
Karich Eric
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