Maybach GO 56

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The first railcars with a GO 56 engine were the Ruhr- type railcars in two parts
The three-part railcars of the Ruhr type three-part had GO 56 engines

The Maybach GO 56 engine was a high-speed diesel engine from Maybach-Motorenbau GmbH for installation in high-speed railcars of the Deutsche Reichsbahn Gesellschaft . It is the further development of the Maybach GO 5 diesel engine . Numerous changes and improvements that have been collected over the years with the GO 5 diesel engine have been incorporated into it. The engine should have a reduced thermal load compared to the original variant. After the engine appeared, many railcars that were manufactured before the Second World War received this engine as an exchange engine for the GO type . The engines of the GO 56 series can therefore be described as the last railcar engines of the Deutsche Reichsbahn to be manufactured with the engine housing split in the center of the crankshaft. There was also a half version of this design with the designation GO 56h , which was equipped as a six-cylinder in-line engine with 225 hp. This version of the engine was installed in the DR 137 347 ... 396 railcars . After the World War, the engines of the GO 56 series were replaced by the tunnel engines from Maybach-Motorenbau . Railcars that remained with the DB were equipped with this type of engine, the vehicles that remained with the DR received the engines of type 12 V 170 DR from ČKD Prague as replacement engines, which were also designed as tunnel engines.

Structure and components

The engine is based on the GO 5, so that the most important design details can be found there. Like this type, the motor has an output of 302 kW at 1,400 revolutions per minute. The most important difference to the original version is the cylinder diameter increased to 160 mm with the following changed parameters stroke volume , compression ratio and mean working pressure. As with the GO 6 engine , the cylinder head had two intake and two exhaust valves, which also changed the shape of the cylinder base. In addition, a number of changes that were made from experience with the GO 5 were also introduced into the engine construction; So it was equipped with a so-called thin, flexible crankshaft, in which the material was chosen as ST 30 from the start. These were carried out with counterweights from the start. The changes showed that the engine's mileage could be increased to 56,000 km, although the engine mass also rose to 2,200 kg.

Technical specifications

Parameter unit value comment
rated capacity kW 302
Torque at nominal power Nm 2060
Rated speed min −1 1,400
Idle speed min −1 600
Cylinder diameter mm 160
Piston stroke mm 200
Stroke volume cm³ 48,255
Compression ratio 15.5: 1
mean piston speed m / s 9.33
medium work pressure bar 5.47
Ignition pressure bar 55
Engine ground kg 2,200
Motor length mm 1,992
Engine width mm 1,532
Engine height mm 1,394
Injector Seven-hole nozzle with 0.3 mm bore
Procurement price RM 34,750

Vehicles equipped with the engine for delivery

The motor coaches of the types DR 137 288 to 295 (Ruhr two-part) and DR 137 283 to 287 (Ruhr three-part) were equipped with the engine at the time of delivery .

Operating experience

The diesel engine had the highest value of the expansion-free mileage in the pre-war engines of the DR railcars at 56,000 km. From the literature there is no information about failure to perform or construction defects. From 1939 onwards, a version increased to 650 hp was to be procured for all diesel multiple units, which essentially corresponded to the GO 5 and GO 6 engine types . 30 upgraded Ruhr railcars had already been ordered for this, the first of which was to be shown at the international transport exhibition in Cologne in 1940. However, the outbreak of war prevented this project.

literature

  • Heinz R. Kurz: The railcars of the Reichsbahn types . EK-Verlag, Freiburg 1988, ISBN 3-88255-803-2

Individual evidence

  1. ^ Heinz R. Kurz: Flying trains . EK-Verlag, Freiburg 1994, ISBN 3-88255-237-9 , p. 92
  2. ↑ Heinz R. Kurz: The railcars of the Reichsbahn types . EK-Verlag, Freiburg 1988, ISBN 3-88255-803-2 , p. 343