SS4 electric locomotive is made up of two cars that are independent respectively but also interconnected, each car being a complete system. The main circuit uses the economic four-section semi-controlled bridge and phase-controlled voltage regulating. It is of constant voltage or constant current controlled traction characteristic, as well as the constant speed or constant excitation controlled resistance braking characteristics. The pneumatic brake adopts DKI type electro-pneumatic brake.
Each car has two bogies with two axles per bogie. The traction motor is installed by means of hugging-axis suspended method. The transfer system of vertical force consists of two suspension devices, among which the secondary suspension adopts the metal rubber laminated springs, with good fluctuation performance.
The transfer system of tractive effort adopts the inclined low draw bar, with wonderful adhesion performance. High strength low alloy structural steels are widely used for carbody.
The traction and braking power of the locomotive is big. It can start up stably, accelerate fast and work reliably. The working condition in the cab is good. It is environment-friendly and easy for maintenance.
Main technical performance
Usage: for freight transportation on main line
Axle arrangement: 2(Bo-Bo)
Catenary voltage: 25kV,50Hz
Rated power: 6400 kW
Continuous tractive effort: 436.5kN
Maximum tractive effort: 627.8kN
Continuous speed: 51.5km/h
Maximum speed: 100km/h
Suspension: half-suspension type
Braking: resistance braking, pneumatic braking
Electric braking power: 5570kW
Gross weight of locomotive: 184t
Axle load: 23t
Distance between coupler centers: 32,832mm