| 摘要 |
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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