Volkswagenwerk Aktiengesellschaft

Volkswagen Ag

Helmut Leptien

Peter Hofbauer

Hermann Danckert

In the displacement machine for compressible media described in the specification, a stationary housing has two spiral displacement chambers and a spiral displacement body is engaged in each displacement chamber. The displacement body extends essentially perpendicularly to a disc-shaped rotor which can be driven eccentrically relative to the housing. In order to avoid butting of the displacement bodies against the walls of the displacement chambers resulting from different heat expansions of the rotor and the housing while maintaining a relatively small clearance between the peripheral contours of the displacement bodies and the peripheral walls of the displacement chambers, the radially outer peripheral walls of the displacement chambers have recesses in their upper edges which extend in the peripheral direction. The height of the recesses is approximately one quarter of the chamber height and the maximum depth of the recesses is approximately 0.15 mm.

Spiral compressor with setback portion on radially outer peripheral wall

An internal combustion engine surrounded, at least in part, by a sound insulating casing. The casing is closed to the atmosphere with the exception of an inlet opening for receiving air for combustion in the engine. An air filter is coupled to the inlet opening for filtering the air passing through this opening into the interior of the casing.

Internal combustion engine with a sound insulating casing

An internal-combustion engine and a compressor driven by the engine are combined into an integrated structural unit by providing that some of the cylinders of a cylinder block are engine cylinders while some of the cylinders of the same cylinder block are compressor cylinders. Between the engine cylinder group and the compressor cylinder group there is provided a space for receiving a slide ring seal which is mounted on a common crankshaft and which extends between and sealingly engages a collar face rotating with the crankshaft as a unit and a bearing block supporting the crankshaft.

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Wolfsburg, Germany

Helmut Leptien