Patent ID: 7159552

Claim:
A cup tappet for an internal combustion engine, having a skirt ( 4 ) which has a radial recess ( 5 ), into which an anti-rotation element ( 6 ) is inserted which protrudes from the skirt ( 4 ) in the radial direction, characterized in that the anti-rotation element ( 6 ) a) has an outer contour in longitudinal section with a head ( 20 ) and a stem ( 21 ), where the stem ( 21 ) has a reduced dimension compared with the head ( 20 ), at least in longitudinal section, and has a thickened portion ( 32 ), and b) can be clipped into the recess ( 5 ) under elastic deformation of the thickened portion ( 32 ), wherein a) the stem ( 21 ) has a first part region ( 28 ) which forms the thickened portion ( 32 ) and a second part region ( 30 ) which is arranged between the first part region ( 28 ) and the head ( 20 ), and the outer dimension of the second part region ( 30 ) is smaller than that of the thickened portion ( 32 ), b) the anti-rotation element ( 6 ) can be clipped into the recess ( 5 ) in the radial direction under elastic reduction of the outer dimension of the first part region ( 28 ), and c) in the installed state, the anti-rotation element ( 6 ) is secured with respect to the skirt ( 4 ) radially inwardly with a first contact face ( 23 ) which is formed by the head ( 20 ), and radially outwardly by a second contact face.( 31 ) which is formed in a transition region ( 29 ) from the first part region ( 28 ) to the second part region ( 30 ).