Schaeffler Technologies Ag & Co .kg

Roland Krapp

Hermann Keller

Peter Sailer

A rail used as a torsional stop for the valve train of an internal combustion engine is disclosed. The rail includes spaces () which are arranged in a row spaced apart at a distance from one another within the rail () and accommodate inserted valve lifters provided as roller tappets (). Two parallel torsional stop areas () are configured on the outer surface of each roller tappet () in the form of planar flattened zones in order to secure the roller tappet () against rotation about the central longitudinal axis thereof. The torsional stop areas () rest against guide areas of the rail (), which are located inside the associated accommodating space (). An insertion opening, indicated as a keyhole (), into which the respective roller tappet () is inserted in a direction of the longitudinal axis thereof before being displaced parallel to the axis towards the guide areas of the rail () used as the torsional stop and then once again being moved in the axial direction, is assigned to the accommodating space () of the rail (). A protruding catch is disposed in the area of the recess () of the rail while a radial groove (), which engages around the catch of the rail () when the roller tappet () is displaced parallel to the axis thereof, is incorporated into the roller tappet () in a region of the torsional stop area.

Rail used as a torsional stop for the valve train of an internal combustion engine, and roller tappet arrangement

The invention provides a valve train for an internal combustion engine, comprising an elongate anti-rotation bridge () acting as a retention device and a mounting aid and comprising receptions () for valve lash adjusters arranged spaced behind one another. A valve adjuster configured as a roller tappet () is arranged in each reception () while being directed through a tappet roller () toward a cam of a camshaft. The roller tappet () is retained for longitudinal displacement in the reception () and is secured against rotation through flat key surfaces arranged on its outer peripheral surface that bear against corresponding inner surfaces of the anti-rotation bridge (). An opening () of the anti-rotation bridge () for allowing a passage of a tappet pushrod that is supported on an end of the roller tappet () is associated to each reception (), and a support surface () limiting each reception () is configured in the anti-rotation bridge () for supporting that end of each roller tappet () that faces away from the tappet roller.

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Wattendorf, Germany

Roland Krapp