Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate
2007-05-01
2007-05-01
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Tappet
C123S090480, C123S090510, C074S569000
Reexamination Certificate
active
11183022
ABSTRACT:
The invention proposes a periodically actuable tappet (1) for a valve train, said tappet (1) comprising a hollow cylindrical skirt (2) that can be arranged through an outer peripheral surface (3) in a guide bore (4) of a surrounding structure (5), said skirt (2) comprising a window-type aperture (6) in which a separate anti-rotation device (8) is arranged through a radially inner portion (7), a radially outer portion (9) of the anti-rotation device (8) extending beyond the skirt (2) for guidance in a longitudinal groove (10) that intersects the guide bore (4), wherein the anti-rotation device (8), as viewed in cross-section, is substantially mushroom-shaped, the inner portion (7) has a rectangular cross-section corresponding to a geometry of the aperture (6) of the skirt (2), into which cross-section, the outer portion (9) merges in the manner of a roof through a fractional cylindrical outer peripheral surface (11), inner legs (12) of the outer portion (9) extend beyond the aperture (6) in peripheral direction and bear against the outer peripheral surface (3) of the skirt (2). Through the measures of the invention, a radially inward directed excursion of the anti-rotation device (8) during operation of the tappet (1) is prevented.
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Denion Thomas
INA-Schaeffler KG
Riddle Kyle M.
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