Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Thyssenkrupp Automotive Ag

Thyssenkrupp Presta Teccenter Ag

Helmut Schön

Peter Kuhn

Frank Obrist

Kai-Uwe Keller

Gordon Köhne

Christian Busch

The invention relates to a device for the variable actuation of the gas exchange valves of internal combustion engines, whereby a continuously revolving cam drives an intermediate member which carries out an oscillating, pure rotational movement and moves a drive member in accordance with the respective valve lift curve via a control cam. In order to modify the valve lift curve, the position of the rotational axis of the intermediate member can be modified along an advance curve. The rotational axis of the intermediate member is represented by a pin which is freely rotatable at its guide end and which carries cam plates that are linked therewith in a rotationally fixed manner. Said cam plates define either directly or indirectly the respective required position on the advance curve. The pin is rotated via a suitable joining element.

Device for variable actuation of the gas exchange valves of internal combustion engines

The invention is characterized in that the gas exchange valves of a cylinder are displaced in a displacement unit () jointly and independently of the displacement of the displacement devices of the other cylinders. Every displacement unit () is associated with separate actuators for actuating the same. Angle of rotation sensors () are provided to detect the angle or rotation signals of the crankshaft and the camshaft or any other shaft rotating at half the crankshaft speed. These angle of rotation signals are used to derive the common idle phase of all valves of a cylinder to be jointly adjusted, a control unit () effecting the displacement of every displacement unit () during said common idle phase.

Device for the variable actuation of gas exchange valves of internal combustion engines and method for operating said device

The invention relates to a device for the variable actuation of gas exchange valves for internal combustion engines, wherein at least one cam () pertaining to a camshaft () mounted in a housing rotates according to the engine speed. The cam () first drives an intermediate member () which performs a clear oscillating, rotary movement and has a rotational axis () that can be displaced in the housing parallel to itself along a curve of displacement (), said intermediate member comprising a control cam () having a lifting region () and actuating an output member () that, in turn, actuates at least one valve (). The aim of the invention is to enable one such device to be reliably controlled. To this end, the control cam () has a catch region (), and the intermediate member () is mounted on a bearing having an axis which corresponds to the rotational axis (), said bearing being arranged in such a way that it is guided in a forced manner and can be displaced parallel to the curve of displacement (), by means of an articulation () connected to the cylinder head or the housing or by a slide () that is guided in the housing in a positively locking manner. The invention also relates to a method for operating an internal combustion engine comprising a plurality of cylinders using at least one of the inventive devices.

Device for the variable actuation of the gas exchange valves of internal combustion engines, and method for operating one such device

The invention relates to a revolving gear consisting of a housing (G), a shaft (W), an intermediate member (Z) and an output member (A). The shaft is revolvably guided in the housing in a rotating joint (wb) and actuates the intermediate member by means of a curved joint (zw). The intermediate member is supported by a curved joint (zg) in the housing and is actively connected to the output member by another curved joint (za). The curved joint between the intermediate member and the housing has a controlling section enabling movement to be transmitted to the output member and a locking section preventing movement from being transmitted to the output member. The output member is unequivocally guided in the housing and transmits movement to at least one valve (V).

Device for variable actuation of the gas exchange valves in internal combustion piston engines

The aim of the invention is to fulfill, in a way that is superior to that of the previous state of the art, the demands placed by the engine on a variable valve control with regard to the shaping and accuracy of the valve lifting curves, to the simplicity of the structural design of the valve drive and of the associated adjusting mechanism, and to mechanical losses due to friction. These demands are met without any additional structural complexity, and, more particularly, without any changes to the overall height. This feat is achieved by means of the provision of a rotatable drive consisting of a housing (G), a shaft (W), an intermediate element (Z), and of an output element (A).

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Frastanz, Austria

Helmut Schön