Volkswagen Ag

Dieter Voigt

Hermann Oetting

Horst-Gunter Hilderts

Andreas Kunne

A gear drive, including a first shaft, a first gear wheel on the first shaft, a second shaft a certain distance away from the first shaft, and a second gear on the second shaft. The second gear wheel engaged with the first gear wheel by way of helical gearing. A third gear wheel is mounted on the second shaft a certain axial distance away from the second gear wheel to compensate for backlash. The third gear wheel also engages with the first gear wheel by way of helical gearing and being axially shiftable with respect to the second gear wheel. An expansion element is arranged so as to change a distance between the second gear wheel and the third gear wheel as a function of temperature. The expansion element has a thermal expansion selected so that, when the expansion element undergoes thermal expansion, the expansion element shifts the third gear wheel in an axial direction along the second shaft and thus, due to a helical gearing effect, compensates for play caused by a thermally induced change in the distance between the first shaft and the second shaft.

Gear drive

A compact, stress-orientated valve control arrangement for an internal combustion engine which is favorable from the production point of view and uses as many identical parts as possible includes a plurality of lift valves for each cylinder and pivoted valve activating levers with hydraulic supporting elements allocated to the latter, in which the geometric arrangement of the pivoted levers for the cylinder is such that the longitudinal axes of the supporting elements extend on the same side relative to the longitudinal axes of the camshafts and extend past the corresponding camshaft axis.

Valve control arrangement for an internal combustion engine having lift

An arrangement for controlling a deactivatable valve in an internal combustion engine includes a locking member which is displaceable between valve-locking and valve-release positions in a coupling element consisting of a rocker arm connecting the camshaft with the valve. In the deactivated state, the rocker arm is movable with respect to the valve and the valve return spring acts as a restoring spring acting through a spring plate which is displaceable relative to the valve.

Valve control arrangement for an internal combustion engine

An intake pipe arrangement for an internal combustion engine having a cylinder head includes individual arc-shaped cylinder intake pipes which surround corresponding fuel-injection valves. A fuel-distributor line for the injection valves is integrated as a bore in a wall region of the intake tubes and the wall region has recesses in which the injection valves are received. The end regions of the injection valves which have spray bores project into recesses in an intermediate flange which is designed so that the flange, after insertion of the opposite ends of the injection valves into the recesses in the wall regions of the intake pipes, can be connected with the cylinder head ends of the intake pipes to provide a subassembly unit.

Intake pipe arrangement for an internal combustion engine having

A space-saving camshaft with at least one cam which can be deactivated includes a coupling bolt which slides back and forth transversely in the camshaft to connect and disconnect the cam and the camshaft. A compression spring in the camshaft urges the bolt toward a coupling bore in the cam in the absence of a countervailing force and the bolt can be forced out of the coupling bore by increasing the pressure of hydraulic fluid in an adjacent compartment in the cam to disconnect the cam from the camshaft.

Camshaft with a deactivatable cam

A cylinder block for an internal combustion engine consists of an upper section containing cylinders and cooling chambers and a lower section having an upwardly facing opening to receive the upper section so as to form an annular oil compartment surrounding the cylinders and below the cooling chambers.

Cylinder block for an internal combustion engine

The specification describes a camshaft arrangement which opens a load-change valve of an internal combustion engine includes a camshaft having a projection which extends beyond what is otherwise a circular cross-section. The camshaft projection limits the relative angular motion between the camshaft and the cam element and includes a buffer which may comprise elastic material or a piston which interacts with a hydraulic medium. The buffer acts to cushion the approach motion of the camshaft projection and the inner wall, or stop, of the cam element, to prevent undesirable noise produced by, or wear of, the camshaft arrangement.

Camshaft arrangement

Undesired knocking in a spark-ignited internal combustion engine is avoided by selectively retarding ignition for individual combustion chambers the first time knocking occurs to identify the knocking combustion chamber and storing the identified combustion chamber in a memory so that, upon later knocking, shifts in the ignition timing of individual combustion chambers can be made utilizing the known ignition sequence.

Method for preventing knocking in a spark-ignited internal combustion

In the embodiments disclosed in the specification, an oil supply system for an internal combustion engine having an oil pan includes an oil reservoir located above the oil pan and an ascending line between the oil pan and the reservoir for delivering excess oil from the oil pan into the oil reservoir using blow-by gases produced in the engine and a flow path for resupplying used oil from the oil reservoir into the oil pan. The oil to be delivered to the individual parts of the engine for cooling and lubricating is supplied from the oil pan by a pumped delivery line and the amount of oil maintained in the oil pan is as small as possible.

Oil supply system for machines such as internal combustion engines

In the embodiments disclosed in the specification, a valve mechanism, preferably for an internal combustion engine, includes a valve spring guide sleeve which receives a cup plunger and has a supply passage for a hydraulic pressure medium in one wall. The guide sleeve at least partially encloses the valve spring and the supply passage is disposed unilaterally in the guide sleeve which has a smaller wall thickness on the side away from the supply passage.

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Wolfsburg, Germany

Dieter Voigt