Patent ID: 8375910
Filing Date: 2013-02-19
Classification: F01L

Abstract:
1. An anti-rotation device for a coupling piston in a switchable component of a valve train of an internal combustion engine, said component comprising two parts that are movable relative to each other, said coupling piston being displaced by a first servo into a bore of one of the two parts for achieving uncoupling via a low or zero valve lift, said coupling piston comprising, at least on one side, a flattened portion starting from a front end of the coupling piston facing another one of the two parts, and via the flattened portion, during a relative movement of the two parts, the coupling piston is displaced by a second servo onto an entraining surface arranged on the other one of the two parts for achieving coupling for a high valve lift, and a cam resetting spring is clamped between the two parts, the anti-rotation device is configured as a partial region of an opening of the bore on a bridge component formed as a continuous ring that extends around the one part, and the coupling piston is guided through its flattened portion on a bowstring-like transverse surface of the bridge component.