Internal-combustion engines – Poppet valve operating mechanism – Rod
Reexamination Certificate
2007-07-24
2007-07-24
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Rod
C123S090480, C123S090350, C123S090550, C074S569000, C074S587000
Reexamination Certificate
active
11304460
ABSTRACT:
The invention proposes a valve train of an internal combustion engine comprising a tappet (7) and a tappet pushrod (1) that is actuated by said tappet (7), said tappet pushrod (1) being at least partly hollow and comprising on one end (3), a first support (4) for an at least indirectly contacting pressure piston (5) of a hydraulic lash adjuster (6) of said tappet (7) that follows a periodic driving element, typically a cam. A second support (9) for a follower member (2), typically a rocker arm, is arranged on a further end (8) of the tappet pushrod (1). The first support (4) comprises a passage (10) for hydraulic medium that can be routed out of the pressure piston (5) during operation of the internal combustion engine into an interior (11) of the tappet pushrod (1), wherein a pipette means (12) is installed in the tappet pushrod (1) for retaining a hydraulic medium column during a standstill of the internal combustion engine. Through the pipette means (12) of the invention, an additional volume of hydraulic medium is available for a rapid filling of the reservoir enclosed by the pressure piston (5) with pressure medium after a re-starting of the internal combustion engine, so that a proper lash adjusting operation is guaranteed from the very beginning.
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Carter William
Karbstein Henning
Kehr David
Denion Thomas
Muserlian Charles A.
Riddle Kyle M.
Schaeffler KG
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