Duplex bogie
The duplex bogie is a bogie developed by Jakob Buchli at SLM with idler wheel sets for express train carriages, in which the rolling motion of the bogie caused by the sinusoidal run should be prevented. The bogie did not get beyond the experimental stage.
technology
The right and left side members of the bogie contain two or two pairs of idler gear sets . Each side member has its own pivot which connects it to the cradle attached to the car body . The secondary suspension consisted of a series of coil springs. The primary springs were attached between the side members and the common bearing housing of a loose wheel pair. The two side members of the bogie were connected with tie rods. The track dimension of the bogie was reduced in the curves because the two side members together with the tie rods behaved like an oblique parallelogram. In addition, the running surfaces of the wheels were designed to be conical, while the stub axle was arranged with an incline of 1:20.
With the duplex bogie one tried to avoid rolling movements that occur with wheel axles with conical wheel tires.
literature
- R. Liechty: Newer Swiss bogie designs . Schweizerische Bauzeitung, Volume 106 (1935), Issue 15 (E-Periodica.ch, PDF 0.5 MB)