Soden gear

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The Soden gearbox was a semi-automatic mechanical manual gearbox, which was used from 1921 in automobile manufacture and in internal combustion engines . It was named after Alfred Graf von Soden-Fraunhofen , the first technical director, co-founder and longstanding board member of ZF Friedrichshafen .

history

The gearbox was created as a further development of the planetary gearbox , which was previously used in automotive engineering as a semi-automatic gearbox and was offered since 1906. In this case, all the gears of the transmission were in constant mesh, the gear changing was practiced by braking the unneeded planetary gears using a band brake . This tried and tested technology was too heavy, which provoked the development of the Soden gearbox.

A weight comparison of the two transmissions provides information. The planetary gear, which was installed on a trial basis in a railcar of the VT 135 series , weighed 450 kg, the Soden gears of the DR 757 to 762 series only weighed 320 kg.

The gearbox was made for passenger cars, trucks and railcars. In the automotive industry, conventional manual transmissions proved to be cheaper and simpler, in rail vehicle construction the few examples used were soon replaced by Mylius transmissions , which were easier to operate and synchronize.

Mode of action

Schematic sketch of the Soden gearbox, K = main clutch, SZ = shift cylinder, SG = shift fork, R = locking roller

In the Soden gearbox , all gear pairs are constantly in mesh. The circuit is carried out via the relevant dog clutch. The transmission consists of a drive and output shaft as well as a shift cylinder and a release unit. The auxiliary shafts and the shift forks correspond to the number of gears to be shifted.

In the sketch, the gear in question is shown in the disengaged state. This can be seen from the fact that the nose of the shift fork is outside of the rotating bolt roller. If the operator preselects the gear to be shifted, this position is first saved. The actual switching process only takes place by pressing the clutch on the drive switch. This releases the main clutch of the engine in one gear. The release unit now ensures that all shift forks have released the connections between the claw clutches. The locking roller can then be rotated into this position so that the bolt of the shift fork of the relevant gear can occupy a hole located in the locking roller.

The release unit is released again and all shift forks are pressed against the lock roller by strong springs. A connection between the dog clutches can only be established in the preselected gear. The connection of the claws cannot be synchronized, the operator has to help out by accelerating accordingly. That was the main reason why rail vehicles were soon to be replaced by the Mylius gearbox .

literature

  • Heinz R. Kurz: The railcars of the Reichsbahn types . EK-Verlag, Freiburg 1988, ISBN 3-88255-803-2 .
  • Wolfgang Meighörner-Schardt: Alfred Graf von Soden-Fraunhofen - Pictures of a Life . Zeppelin Museum Friedrichshafen, Friedrichshafen 1994, ISBN 3-926162-94-5 .
  • Werner Beisel: The sod gear . 2018, ISBN 978-3-00-058503-6 .

Web links

Individual evidence

  1. ↑ Heinz R. Kurz: The railcars of the Reichsbahn types. EK-Verlag, 1988, ISBN 3-88255-803-2 , p. 143.
  2. ↑ Heinz R. Kurz: The railcars of the Reichsbahn types. EK-Verlag, 1988, ISBN 3-88255-803-2 , p. 66.