SŽD series Э эл 8
| SŽD series Э эл 8 (E el 8) | |
|---|---|
| Number: | 1 |
| Manufacturer: |
Krupp Sulzer Sécheron Murom plant |
| Year of construction (s): | 1932 |
| Retirement: | 1953 |
| Axis formula : | 2'Eo1 ' |
| Gauge : | 1520 mm |
| Length over buffers: | 17,850 mm |
| Service mass: | 149 t |
| Friction mass: | 106.6 t |
| Wheel set mass : | 21.3 t |
| Top speed: | 55 km / h |
| Installed capacity: | 2 × 825 hp |
| Starting tractive effort: | 21,000 kp |
| Driving wheel diameter: | 1,320 mm |
| Impeller diameter: | 1,050 mm |
| Motor type: | 8-cylinder four-stroke diesel engine |
| Motor type: | Sulzer 8V-31/37 |
| Rated speed: | 640 / min |
| Drive: | diesel-electric |
| Coupling type: | Screw coupling |
The locomotive of the class Э эл 8 (German transcription E el 8) of the Soviet Railways (SŽD) was a broad-gauge diesel locomotive of the first generation, which had two motor-generator units as a special feature. The locomotive had some defects and therefore it did not go into series production.
history
Project planning for this locomotive began in the late 1920s. A diesel locomotive of the type 1'Eo 1 'with a service weight of 136 t, two diesel generator units, and therefore with diesel-electric drive was planned. The diesel locomotive was intended for heavy train service, and its parameters were similar to the FD and IS steam locomotives of the time . The use of two diesel engines made it possible to switch off one of them depending on the required power and at the same time to increase the reliability of the locomotive, since at that time the reliability of the engines could not be guaranteed 100%.
The detailing of the project was worked out in Germany at Friedrich Krupp AG . It was found that the specified weight could not be adhered to, so that the axle sequence was changed to 2'Eo1 ' . At the same time, a resistance brake should be used. The locomotive was built by Krupp in the years 1931–1932. In March 1933 it was transferred to the Soviet Union and fully assembled in the Murom factory .
technology
The car part was analogous to the Э эл 2 built and consisted of a frame, a two-axle bogie and a frame of the type Bissel . To improve the entry into the curved track, the bogie had a deflection of ± 110 mm. The second and fourth drive axles did not have a flange . The minimum curve radius to be driven through was 150 m.
Each of the two diesel generator units consisted of the 8-cylinder four-stroke diesel engine 8V-31/37 from Sulzer with an output of 605 kW (825 hp) at a nominal speed of 640 / min. Its crankshaft was directly connected to the traction generator's shaft. The current in its windings was regulated according to the Ward-Leonard system , and it was also equipped with reversing poles to start the diesel engine. The auxiliary generator was used to feed the windings of the generator and to charge the battery.
The five double traction drive motors from the Sécheron company were mounted in the frame and had forced ventilation. The torque for transmission to the drive wheels was transmitted by the Sécheron spring drive . The transfer ratio was 1 / 6.8. The driver's switch was 15 speed steps.
commitment
The diesel locomotive was first used for the test operation on the Moscow - Leningrad line of the October Railway , after completion it was given to the Ashgabat depot . It was determined in the experiment that the continuous output was 1050 hp at a speed of 24 km / h to 50 km / h, the continuous traction was 21000 kp at 12.5 km / h. At speeds over 24 km / h, only 12,000 kp could be determined.
The locomotive was used in train service and was a useful addition to the diesel locomotives of the Э эл series . However, it could not implement its full capabilities because the main weak point in its design was the Sécheron spring drive . This often resulted in individual spring breaks, which meant that the machine had to be parked for repairs. Obviously, it was not possible to make a decision to redesign the spring pots in the same way as the Kleinow spring pod drive , and a possible series production of the locomotive would have been problematic due to production abroad. So it stayed with this one copy. During the Great Patriotic War , the locomotives were taken out of active service and retired in 1953.