Internal-combustion engines – Poppet valve operating mechanism – Rocker
Reexamination Certificate
2007-12-11
2007-12-11
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Rocker
C123S090430, C123S090440, C123S090200, C123S090670, C074S559000, C074S569000
Reexamination Certificate
active
11125360
ABSTRACT:
A two-step roller finger follower having a high-lift follower portion that rotates relative to a low-lift follower portion about a pivot shaft, including a lost-motion compression spring disposed in a linear bore formed in the high-lift portion to exert force against an curved pad on the back side of the valve pallet of the low-lift portion. The spring is retained and guided in its bore by a spring retainer having a planar bottom for engaging the curved pad. Preferably the retainer is a cup positioned in the spring bore such that the stroke of the cup is limited, to prevent leak-down of the associated hydraulic lash adjuster. Driving the spring by a linear-acting retainer in a linear bore causes the spring to be compressed linearly, resulting in a highly stable and predictable spring rate.
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EP Search Report dated Oct. 12, 2006.
Fernandez Hermes A.
Fischer Thomas H.
Hendriksma Nick J.
Kunz Timothy W.
Lipinski Andrew J.
Delphi Technologies Inc.
Denion Thomas
Marshall Paul L.
Riddle Kyle M.
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