Java bogie

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Java bogie
Series 3000 of the Electric State Spoorwegen (ESS) on Java .

The Java bogie in which Swiss literature often only Java frame , is one of the Swiss Locomotive and Machine Works constructed (SLM), combined driving-axle - Laufachs - bogie , which in the context locomotives was applied. The bogie got its name because it was first delivered to the class 3000 express train locomotives built in 1925 for the Electrische Staats Spoorwegen (ESS) in Java .

technology

The construction of electric locomotives for top speeds of over 100 km / h prompted Jakob Buchli to research the cornering of rail vehicles. The Krauss-Helmholtz steering frame with its relatively light superstructure was not enough on the winding Swiss routes .

The Java frame was created as a result of this research. The pivot is located just in front of or behind the drive axis so that the drive axis can adjust radially in the curves and its approach angle is reduced. With the Buchli drive, the movement of the drive axis was limited within a narrow framework and had to be compensated by the drive; the SLM universal drive, which was also used , was able to compensate for larger movements. In order to be able to drive through even tighter bends, the running axle in the bogie was designed as an Adam's axle .

Running gear of a (1A) B (A1) locomotive with movable central axles and Java bogies driving straight ahead and in a curve

vehicles

In a very similar design and the same gauge as the Java locomotives, SLM and BBC delivered two locomotives 7000–7001 to the Japanese State Railways.

The greater part of the SBB Ae 4/7 was also equipped with Java frames, which gave them very good running properties. Because the maintenance of the Java bogies was more complex, they were replaced by Bissel axles from 1966 .

The Java bogie was used again in the SBB Ae 8/14 double locomotives (1931/32, 1939), with the last one for the first time with pivot pins between the axles. The two outer drive axles and the adjacent running axle of the SBB Ae 4/6 10801-10806 (1941/42) were combined into a Java frame. In the case of the SBB Ae 4/6 10807-10812 (1944/45), a further development of the Java frame was used, in which centering springs and a reset device were intended to ensure stable running on straight stretches and smooth cornering. The mechanical part of the Ae 4/6 was largely modeled on the NS series 1000 delivered to Holland in 1948 . The gas turbine locomotive SBB Am 4/6 1101, which was put into operation in 1941 and was converted from 1958–61 into the Ae 4/6 III 10851, was similar in its axle arrangement .

Thanks to the research already mentioned, the two-axle motor bogies have also been further developed, which u. a. 1944 led to the construction of the BLS Ae 4/4 . The successors to this bogie locomotive without running axles replaced the frame locomotives after the Second World War, which meant that the Java bogie was overtaken by technical developments.

Individual evidence

  1. ↑ Schweizerischer Lokomotivbau 1871-1971 page 70 Figure 71
  2. ↑ Schweizerischer Lokomotivbau 1871-1971, page 65 Figure 64
  3. ^ Hans-Peter Bärtschi: Electric locomotives from Swiss factories. In: Verkehrshaus der Schweiz (Ed.): Coal, electricity and rails: The railroad conquers Switzerland. Verlag NZZ, Zurich 1998, ISBN 3-85823-715-9 , page 278

literature