Julius sons

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Julius Söhnlein (born September 28, 1856 in Schierstein ; † June 6, 1942 in Eberswalde ) was a German engineer and inventor who significantly improved the two-stroke engine .

Life and effect

The son of the sparkling wine manufacturer Johann Jacob Söhnlein has been involved with vehicles since he was a child. In 1891 Söhnlein received DRP patent no. 83210 for a two-stroke engine in which the intake, overflow and exhaust processes were controlled by the working piston ; the crankcase served as a flushing pump.

“The machine to be described has no actual control mechanism, there is a power stroke for every revolution. Instead of transferring the functions of the control to a special mechanism, the control processes in the present machine are effected in the simplest way by the working piston overflowing certain openings in the cylinder wall and thereby periodically covering or leaving them open. "

- Extract from the Swiss patent specification, patent no.4395.

In contrast to the two-stroke engine from Dugald Clerk , with a separate flushing pump and automatic check valves on the inlet and overflow channels, Söhnlein's two-stroke engine was controlled by the piston and the flushing gas flow was directed through a channel in the piston crown (the so-called "fountain flushing"). Julius Söhnlein himself did not use his invention commercially, but his brother Heinrich Söhnlein (1858–1942) founded the manufacturer “Solos” (also “Solos-Motorenfabrik Schierstein”) in Wiesbaden after the turn of the century and produced two-stroke engines based on his brother's patents. He built slow and fast running two-stroke engines with an output of 1.5 to 12  hp (1.1 to 9 kW), among other things for the capstan drive on ships used for navigation on the Rhine . In 1917 the company was dissolved and the name was forgotten. To date, almost all small two-stroke engines are slot-controlled using the Söhnlein system, but the name Söhnlein is almost exclusively associated with the Söhnlein sparkling wine cellar .

Web links

Individual evidence

  1. ↑ a b c d e Siegfried Rauch: The two-stroke engine in motorcycle construction. In: Christian Bartsch (Ed.): A century of motorcycle technology. VDI Verlag, 1987, ISBN 3-18-400757-X , pp. 124-127
  2. ↑ a b Richard von Basshuysen: gasoline engines with direct injection. Process, systems, development, potential. Vieweg + Teubner Verlag 2007, ISBN 978-3-8348-0202-6 . P. 406
  3. ↑ New petroleum engines. In: Polytechnisches Journal . 303, 1897, pp. 246-251.
  4. ↑ kulturkurier.de (accessed on September 18, 2013)
personal data
SURNAME Little son, Julius
BRIEF DESCRIPTION German engineer and inventor
DATE OF BIRTH September 28, 1856
PLACE OF BIRTH Schierstein
DATE OF DEATH June 6, 1942
Place of death Eberswalde