Latch timing mechanism for a two-step roller finger cam...

Details Latch timing mechanism for a two-step roller finger cam... Latch timing mechanism for a two-step roller finger cam...

2005-11-22

2005-11-22

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090160, C123S090440

Reexamination Certificate

active

06966291

ABSTRACT:
In a two-step roller finger cam follower, a slider arm for engaging a high-lift cam lobe is pivotally mounted to the body and can variably engage a latch pin slidably disposed in a latch pin channel. A second channel in the body opens onto the slider arm and contains a timing pin that rides on an eccentric surface of the slider arm to extend or retract the timing pin. A bore between the latch pin channel and the timing pin channel contains a ball controlled by the timing pin to lock the latch pin into an engaged or disengaged position. The cam lobe has an undercut region such that the latch pin is allowed to move between engaged and disengaged position only when the slider arm is in the undercut region of the cam lobe. The latch pin can move only when the timing pin permits.

REFERENCES:
patent: 6591798 (2003-07-01), Hendriksma et al.
patent: 6668775 (2003-12-01), Harris
patent: 6691657 (2004-02-01), Hendriksma et al.
patent: 6755167 (2004-06-01), Krieg et al.

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