Baden VIII e

from Wikipedia, the free encyclopedia
Baden VIII e
DR series 56 7
No. 780 around 1908
Numbering: VIIIe 1
No. 771-780
DR 56 701-709		 VIIIe 2–5
No. 9… 827
DR 56 711–738		 VIIIe 6–8
No. 3… 866
DR 56 751–785
Number: 10 29 31
Manufacturer : Maffei , MBG Karlsruhe MBG Karlsruhe MBG Karlsruhe
Year of construction (s): 1908 1910-1912 1913-1915
Retirement: until 1931
Type : 1'D h4 v (1'D n4v)
Genre : G 45.16
Gauge : 1435 mm
Length over buffers: 19,124 mm 18,784 mm 18,804 mm
Height: 4650 mm
Width: 3000 mm
Fixed wheelbase: 3300 mm
Total wheelbase: 7450 mm
Wheelbase with tender: 15,860 mm
Smallest drivable radius: 164.5 m
Empty mass: 70.4 t 69.4 t
Service mass: 77.1 t 75.3 t 76.0 t
Friction mass: 65.5 t 63.2 t 64.0 t
Wheel set mass : 16.4 t 15.8 t 16.0 t
Top speed: 65 km / h
Coupling wheel diameter: 1350 mm
Impeller diameter: 850 mm
Control type : Heusinger
Number of cylinders: 4th
LP cylinder diameter: 635 mm 610 mm 610 mm
HD cylinder diameter: 395 mm 380 mm 395 mm
Piston stroke: 640 mm
Boiler overpressure: 16 bar
Number of heating pipes: 332 312 169
Number of smoke tubes: 28
Heating pipe length: 3650 mm 4200 mm
Grate area: 3.75 m² 3.55 m²
Radiant heating surface: 13.0 m² 11.88 m² 11.85 m²
Tubular heating surface: 182.0 m² 175.21 m² 152.52 m²
Superheater area : 50.1 m²
Evaporation heating surface: 195.0 m² 187.09 m² 164.35 m²
Tender: bath. 2'2 'T 20
Water supply: 20 m³
Fuel supply: 7 tons of coal
Brake: Westinghouse brake

The steam locomotives of type VIII e of the Grand Ducal Baden State Railroad were the first freight locomotives with a bar frame and the first with the 1'D wheel arrangement in Germany . They were also the last type of freight train locomotive developed in Baden . After the takeover by the Deutsche Reichsbahn , the locomotives were classified in the class 56 7 .

history

At the beginning of the 20th century, the D-couplers of types VIII a and VIII b as well as the mallet locomotives of type VIII c had reached the limit of their performance due to the increasing train loads. In addition, the running behavior of the latter was not entirely convincing. The Baden State Railroad therefore decided to design type 1'D locomotives with a four-cylinder compound drive. The first delivery was made in 1909 by Maffei based on designs by senior building officer Alexander Courtin . During the development of the locomotives he was in contact with Karl Gölsdorf . The machine has similar solutions as the 170 series of the Austrian State Railways. On Gölsdorf's advice, a clench type steam dryer was also used to improve performance. From the 6th delivery series onwards, this was replaced by a Schmidt flue pipe superheater. The clench steam dryer was later expanded so that the locomotives could continue to be used in wet steam operation.

A total of 70 locomotives were purchased in eight delivery series. Five locomotives of the first series were supplied by Maffei and five by the mechanical engineering company Karlsruhe. All other delivery series were carried out in the Baden locomotive factory. With the locomotives one tried to cover the demand for freight locomotives for the next few years as much as possible. Only the heavy transport volume during the First World War made the use of class G 12 locomotives necessary. 68 VIII e were taken over by the Reichsbahn. The last locomotives were retired in 1931 because the locomotives produced under the direction of the Reichsbahn were much more powerful.

The class VIII e was able to pull a 1,840 ton train on the plain at 45 km / h. At 700 tons the speed was 65 km / h and with a gradient of 20 ‰ at 340 tons it was 25 km / h.

Constructive features

Drawing of an VIII e first delivery series

The locomotives had a one-piece forged bar frame with a thickness of 100 mm. The long bowl consisted of two sections and was very high with a height of the middle of the bowl of 2790 mm above the upper edge of the rail. The standing kettle protruded beyond the frame, which enabled a relatively large grate surface. The clench steam dryer protruded through the smoke chamber tube wall . The copper firebox had a smooth semicircular ceiling on the outside. The fire door was in three parts. The boiler was connected to the frame via pendulum plates and the smoke chamber via the cylinder saddle. The safety valves were of the Coale Muffler type. In the first delivery series, the steam dome was at a height between the 2nd and 3rd coupling axle. In the later series he was pushed further forward. The locomotives of the delivery series with steam dryer were equipped with a separate control dome between the steam dome and the chimney.

Two jet pumps were used as feeding devices. Later, a Knorr-type preheating system with a feed pump was used. The 8th delivery series was already equipped with it upon delivery.

The landing gear was supported at four points. The wheelset was designed as an Adam's axle with 65 mm lateral displacement. The second and fourth set of coupled wheels had a side play of 25 mm. The driving and coupling axles were suspended by leaf springs below and the wheelset by leaf springs above. The wheelset, the first and the second coupling axle were connected with a balance lever.

VIII e first delivery series No. 773

The four-cylinder engines worked on the third coupled axle. In the locomotives of the first to fifth delivery series, after the clench steam dryer was removed, it was a wet steam engine, in the other locomotives a superheated steam engine. The outer low-pressure cylinder was arranged horizontally, while the inner high-pressure cylinder was inclined 8 °. The high-pressure and low-pressure cylinders on one side were combined in a common cast block. The coupling wheels had counterweights. The to-and-fro masses were not balanced.

A Heusinger control with hanging iron served as control. Up until the fifth delivery series, high-pressure and low-pressure valves had a common valve body with a common valve rod. After that, the locomotives had separate valves. To improve the start-up behavior, the low-pressure slide valves had a double inflow with filling-dependent valves.

The Westinghouse brake acted on all coupling wheels from the front. The second and third sets of coupling axles could be sent. The speedometer was of the Hausshistor type.

The vehicles were a Schlepptender the type bad 2'2 'T 20 equipped. Baume & Merpent delivered 40 pieces from Haine-Saint-Pierre, Belgium. 19 tenders were made by the Rastatt wagon factory and eleven by the Fuchs wagon factory in Heidelberg.

literature