Abstract: A valve drive for controlling gas exchange valves of an internal combustion engine having a cylinder head, a valve stem and a longitudinal tappet axis including a camshaft having a first cam with a first cam profile and a second cam with a second cam profile greater than the first cam profile. The second cam has two cam members which abut both sides of the first cam. A cup-shaped tappet is slidably disposed within the cylinder head for engaging the two cam members. A central tappet is disposed within the cup-shaped tappet for engaging the first cam. A lash adjuster is disposed within the central tappet and supported against the valve stem. A hydraulic switching arrangement is disposed between the cup-shaped tappet and the central tappet for selectively moving the valve stem according to the first and second cam profiles.

Abstract: An air intake system for a multi-cylinder internal combustion engine, especially an internal combustion engine with fuel injection, the intake system including a multi-partite distributor housing to which are connected first and second individual intake pipes with openings thereof lying in mutual opposition within the distributor housing. The distributor housing is divided in an area of the openings of the intake pipes at least in sections in the longitudinal direction of the individual intake pipes. Auxiliary pipes emanate from the openings of the intake pipes and are arranged in a mutually overlapping relationship in the distributor housing so that a simple and compact construction is realized with the possibility of having auxiliary pipes with great lengths within the distributor housing.

Abstract: An actuating installation for working medium valves in reciprocating engines with at least one cam shaft and one cam each for each valve and with at least an indirect actuation of the valves by the corresponding cam, and with hydraulic play-compensating elements, each of which is provided with one working space filled with lubricating oil that is connected to the oil circulatory system of the reciprocating piston engine; the place of the hydraulic connection of the play-compensating elements with the oil lubricating system is located at such a place in this circulatory system, at which the oil circulatory system has a pressure, conditioned on the system, which at all operating conditions lies below the feed pressure of the circulation but above the atmospheric air pressure of the reciprocating engine.