Cylinder head assembly of an internal combustion engine

Abstract

A tappet (,) for a valve drive of an internal combustion engine is so designed as to be switchable for different valve lifts and includes an outer circular ring shaped section (,) which encloses a circular section (,). Both sections (,) are acted upon by cams of different lifts, and selectively interconnectable together by coupling elements (,). According to the invention, a juncture (,) for hydraulic fluid is positioned in the skirt (,) and extending from a feed bore (,) in the cylinder head (,) at a lowest point of the tappet (,), when viewed in direction of gravity, in order to install the tappet (,) in an extreme slanted disposition. In opposition thereto, a port (,) of the channel (,), following the juncture (,), is arranged at a highest section of the tappet (,), when viewed in the direction of gravity. Thus, after shut-down of the internal combustion engine, a reservoir (,) can empty only to the level of the port (,), so that the tappet (,) is sufficiently filled with hydraulic fluid when restarting the internal combustion engine.