Two-step roller finger follower

Internal-combustion engines – Poppet valve operating mechanism – Rocker

Reexamination Certificate

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Details

C123S090430, C123S090440, C123S090200, C123S090670, C074S559000, C074S569000

Reexamination Certificate

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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.

REFERENCES:
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patent: 5515819 (1996-05-01), Groh et al.
patent: 5524580 (1996-06-01), Muir
patent: 5544626 (1996-08-01), Diggs et al.
patent: 5615647 (1997-04-01), Nielsen
patent: 6220213 (2001-04-01), Haas et al.
patent: 6382153 (2002-05-01), Rohe et al.
patent: 6769387 (2004-08-01), Hayman et al.
patent: 2004/0226523 (2004-11-01), Kreuter et al.
patent: 41 18 287 (1992-12-01), None
patent: 103 11 358 (2004-09-01), None
patent: 0 442 460 (1991-08-01), None
EP Search Report dated Oct. 12, 2006.

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