Internal-combustion engines – Poppet valve operating mechanism – Lubrication
Reexamination Certificate
2006-10-10
2008-11-25
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Lubrication
C123S090120, C123S090130, C123S090550
Reexamination Certificate
active
07455040
ABSTRACT:
An oil distribution system for an internal combustion engine comprising a longitudinal bore in the engine head or block connected to an engine oil pump. A longitudinal insert is disposed in the engine bore, the insert being formed and disposed to define segmented galleries within the bore, a first oil gallery being in communication with the engine camshaft bearings and a second oil gallery being in communication with switchable cam followers in the engine. The two galleries are separated but connected by one or more oil control valves. Thus, the camshaft bearings are exposed to high engine oil pressure at all times independent of the switchable cam followers; likewise, the switchable cam followers may be latched and unlatched at any time or condition deemed beneficial for engine operation without jeopardizing lubrication sufficiency to the camshaft bearings.
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European Search Report dated Jun. 9, 2008.
Dinkel Michael J.
Hendriksma Nick J.
Spath Mark J.
Chang Ching
Delphi Technologies Inc.
Smith Michael D.
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