Patent ID: 8863716

Claim:
A tappet, comprising a housing comprising on a drive side, a cam contacting surface, a driven side of said housing serving for an at least indirect contact of a pump piston or of a gas exchange valve being situated on an underside of a bridge member extending across an inner peripheral surface of said housing, an anti-rotation device extending from a window of said housing to project beyond an outer peripheral surface of said housing and said anti-rotation device serving for a non-forced engagement in an axial guide of a guide bore of a surrounding structure, said axial guide comprising a partially cylindrical cross-section and said guide bore receiving said housing, in a region protruding beyond the housing, the anti-rotation device is configured substantially as an upright, semi-cylinder type body, having a peripheral surface that possesses a cross-section of an ogival arch formed out of two circular arcs connected by a straight line in a radially outer region.