Patent ID: 7900592

Claim:
A switchable component for a valve train of an internal combustion engine, said component comprising: a housing in whose bore an axially displaceable inner element is received, at least one coupling means being arranged in the inner element, said coupling means, for effecting coupling axially distant relative position of the inner element to the housing, being able to be brought partially into engagement with an entraining surface of the housing, the inner element being biased in outward direction from the housing by at least one lost motion spring, an axially fully extended position of the inner element being defined by a stop means overlapping an annular groove between the inner element and the housing, and an anti-rotation device being arranged between the inner element and the housing, wherein the anti-rotation device is a thin-walled ring comprising a slit, a central rectangular extension situated diametrically opposite the slit projects inwards from the inner peripheral surface of said ring which extends parallel to a transversal plane of the component on an outer peripheral surface of the housing, the housing comprises an aperture that is complementary in shape to the extension of the ring and said extension extends through said aperture, a counter surface for the extension extends in the form of a longitudinal flattened portion or a longitudinal groove in the outer peripheral surface of the inner element and, for effecting anti-rotation, the extension extends with a complementary inner surface directly on or into said counter surface, and wherein the ring has a substantially C-shaped profile or a substantially U-shaped profile, is seated securely in an annular groove in the outer peripheral surface of the housing and does not project with an outer peripheral surface beyond the outer peripheral surface of the housing.