Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate
2007-06-20
2009-11-03
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Tappet
C123S090450, C123S090520, C074S569000
Reexamination Certificate
active
07610887
ABSTRACT:
A valve-deactivation hydraulic valve lifter including a recessed face on the pin housing for making contact with the a crowned surface region of a roller follower. The lifter includes a pin housing that is slidably disposed within an axial bore in a lifter body. Pins for variably locking the pin housing to the lifter body may be disengaged to place the lifter in lost-motion mode by application of engine oil to the outer ends of the pins. A surface of the pin housing, preferably configured as a dished surface, is formed on the bottom end face of the pin housing that approaches the cam-following lifter roller for making contact with the roller follower so as to avoid contacting the roller follower's crowned surface region.
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patent: 6802288 (2004-10-01), Spath
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patent: 6976463 (2005-12-01), Spath et al.
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Chang Ching
Delphi Technologies Inc.
Twomey Thomas N.
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