Audi Ag

Rainer Wurms

Alfred Ottowitz

Ralf Budack

Thomas Rieger

Murat Serifsoy

Thomas Schladt

Stefan Dengler

Dietmar Wermuth

Georg Faltermeier

The invention relates to a variable valve train for reciprocating engines, in particular internal combustion engines comprising at least one cam of a camshaft that is rotatably mounted in the cylinder head. Said cam actuates a lift valve using a pulley assembly which can be displaceably guided in a sliding-block part along an adjusting inclined plane, together with a valve actuating element which is connected in series. The valve stroke can be adjusted in a variable manner in relation to the cam by the displacement of the sliding-block part and the pulley assembly is elastically pre-tensioned in relation to the cam. To achieve a sturdy valve train which exhibits uniform valve accelerations, a free travel (s) that allows an excitation movement of the pulley assembly is provided between the cam heel and the valve actuating element. The valve actuating element is configured as a two-part cam follower with a rocker action and the sliding-block part has a sliding-block guide comprising an additional excitation inclined plane for the pulley assembly.

Variable valve control comprising a sliding-block part and a free travel

In a direct injection internal combustion engine having per cylinder at least two intake valves mounted side by side, at least one exhaust valve , a more or less coaxial ignition device , an injection valve , and a piston with combustion chamber trough , the injection valve being mounted on the intake side, improved mixture preparation and combustion characterized by low fuel consumption and low exhaust emissions are achieved by mounting,the center of the combustion chamber trough in the piston noticeably displaced relative to the axis of the cylinder in the direction of at least one exhaust valve , and are achieved in that the boundary wall of the combustion chamber trough extends in projection along the axis of the cylinder between the ignition device and injection valve

Direct injection internal combustion engine

The invention relates to an internal combustion engine with direct fuel injection comprising at least two adjacent inlet valves ( ) per cylinder, a number of outlet valves ( ), an essentially coaxial spark plug ( ), an injection valve ( ) and a piston ( &prime;). The aim of the inventive engine is to provide an improved mixture preparation which is characterized by low fuel consumption and low exhaust emissions. To this end, the injection valve ( ) is arranged between two of the adjacent inlet valves ( ) and the section of the cylinder wall adjacent to said inlet valves ( ). in addition, the piston ( &prime;) has a longitudinally extended combustion chamber cavity ( ), whereby the combustion chamber cavity ( ) essentially extends along the front surface of the piston ( &prime;) in the direction of the vertical projection of an injection stream (E) exiting from the injection valve ( ). Said cavity also comprises a step ( ) which essentially runs in a transversal direction.

Growing community of inventors

Lenting, Germany

Rainer Wurms