Stelzer engine

When Stelzer engine, named after its inventor Frank Stelzer, it is a two-stroke free piston engine in cylindrically elongated, bilaterally symmetrical construction.

The Stelzer engine only the continuous piston is moved back and forth. Its different diameter ( differential piston ) control during the various work cycles at the same time the gas exchange between the individual rooms. In the housing a central precompression chamber with a large diameter and central inlet opening, then to the outside each overflow opening and closer to it are then again more combustion chambers with the spark plug and at the outlet farthest from the center point. To each of the three regions include an appropriate diameter of the piston.

Workflow for a page

The piston is a so called differential piston. He has centered on a wheel that constantly changes sides in the precompression chamber. Characterized the inlet opening is alternately assigned to the left and right part of the expanding chamber. After passing over the inlet opening, the enclosed volume will be reduced, and the mixture pre-compacted thereby.

In the course of the further movement of the piston further outward plug-like portion of the piston which closes the overflow opening is disengaged, the gas passes into the combustion chamber and the combustion chamber on the outer end there rinsed residues of burnt gas on the outlet of opened.

In the backswing the piston closes both the spill and at the other end of the combustion chamber with his work part of the exhaust port. The working part moves into the combustion chamber on the middle and compressed here the mixture to ignition and reverse motion. Now performs work during the re- Away - movement of the piston. In the inner region the next precompression is already taking place. Shortly before the outer dead center opens first outlet, shortly after the spill.

This workflow is constantly held alternately on both sides.

Applications

Air pump

If the bulb ends extended beyond the housing, the application is possible as a compressor. This then works as both sides acting dual-chamber piston air pump.

Hydraulic pump

With a longitudinally pierced piston can accelerate Stelzer engine fluids and build hydraulic pressure in a circuit. He then acts as a hydraulic pump. A practical examination of the application by Stelzer is not known.

Power Generator

If the bulb ends extended beyond the housing, the application is possible as a power generator - the Stelzermotor then operates as a linear generator. The piston or its protruding ends are provided for this purpose with magnets, which are immersed in windings and induce it by their motion, an electrical voltage. Several prototypes of this linear generator were tested.

Criticism

The basic principle is that of free-piston engine. It has been known for about 100 years. Today's applications are limited to special. There are Stelzermotor up to the quoted below assessments, no independent sources or opinions for the alleged benefits of the engine. Nor was tested a prototype of an independent body. Although the patent rights have expired since 2004 ( Patent of 1964), there is still no known independent researchers or even manufacturers.

The combustion chamber of the Stelzermotors is highly fissured by the differential piston, which has an adverse effect on combustion. The engine thus has the same problems as double-acting two-and four -stroke engines, which are practically not used since the 1950s.