Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate
2007-12-04
2009-12-29
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Tappet
C123S090160, C123S090440, C123S090520, C074S569000
Reexamination Certificate
active
07637237
ABSTRACT:
A switchable double tappet (1) is provided, especially for a tappet-push rod valve train of an internal combustion engine, with a cylindrical housing (2), which is arranged so that it oscillates via its outer casing (3) in a guide (4) in the internal combustion engine side and which has a bore (5) on the camshaft side, in which an inner element (6) moves axially relative to this borehole, wherein, on one side, a cam contact surface (10) is intrinsic to this inner element on its end projecting past an edge (7) of the borehole (5) or lower head (9) running in the region of the edge (7) and also, on the other side, at least one coupling slide (11) is intrinsic in its interior in the decoupled case, and this coupling slide can be displaced partially for a coupled case in or under a respective catch surface (12) of the housing (2), wherein between an upper head (13) of the inner element (6) facing away from the lower head (9) and a lower side (14) of a crossbar (15) of the housing (2), at least one lost-motion spring (16) is tensioned and, in a borehole (17) of the housing (2) away from the camshaft, above the crossbar (15), there are two supports (18) lying next to one another, on each of which an end of a tappet push rod can be supported.
REFERENCES:
patent: 7363894 (2008-04-01), Evans et al.
Bugescu Florin
Evans Matthew
Chang Ching
Schaeffler KG
Volpe and Koenig P.C.
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