Roller bearing and z-stop for a two-step roller finger follower

Details Roller bearing and z-stop for a two-step roller finger follower Roller bearing and z-stop for a two-step roller finger follower

2007-09-25

2009-11-10

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090160, C123S090440

Reexamination Certificate

active

07614375

ABSTRACT:
A two-step roller finger follower having a high-lift follower portion that pivots on a pivot shaft disposed on a low-lift follower portion, and having a lost-motion spring disposed between the high-lift follower and the low-lift follower to bias the high-lift follower toward the high lift cam lobe. Various bearing cups and roller shaft sleeve embodiments are shown, all of which allow for improved shaft and needle bearing arrangements. A z-stop formed by the bearing cups and/or the shaft sleeve limits the range of travel of the high-lift follower with respect to the low-lift follower. Various z-stop embodiments are provided including a non-contacting roller shaft sleeve that grounds the high-lift follower to the low-lift follower independent of the roller shaft.

REFERENCES:
patent: 5709180 (1998-01-01), Spath
patent: 6615782 (2003-09-01), Hendriksma et al.
patent: 6997152 (2006-02-01), Harris
PCT Search Report dated May 12, 2008.

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