SDD21 Diesel Engine

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The axle load of SDD21 diesel engine is 22.5t. It equipped with 12V280ZJ diesel engine with electronic fuel injection control system, AC auxiliary electric transmission system, CDJF204E main alternator with brushless excitation, ZD109E traction motor, U tube bogie with three axels. It has performance of double heading in consist. It is a AC-DC transmission mainline freight diesel locomotive, which adopts complete microcomputer logic control technology and resistance braking system with the performance of self-load test at full power.

This locomotive is of small clearance. It is applicable to railway built as per UIC505-1 standard clearance. On consideration of the maintenance area, the locomotive adopts modularized design, manufacture and assembly, which is convenient to components maintenance and locomotive assembly. It adopts complete microcomputer logic control technology, complete constant traction power control, anti-slip and anti-slide protection. The auxiliary system is AC transmission, added a JQJF480 AC auxiliary alternator, supplying power to cooling fan motor and ventilator motor. The lubrication oil system is equipped with self-cleaning filter, compared with paper filter, it reduces the time of filter daily maintenance and improves the grade and efficiency of filter.

Main technology parameters

Locomotive type:SDD21 Type

Purpose:Mainline freight locomotive

Running area:Iran national railway

Running conditions:

1) Maximum temperature in the hottest month:50℃

2) Minimum temperature in the coldest month:-25℃

3) Relative humidity:95%-100%

4) The worst case condition:45℃、1400m

Gauge:1435 mm

Locomotive clearance limit:UIC 505-1

Transmission mode:Main transmission　AC-DC transmission　Auxiliary transmission　AC transmission

Axle arrangement:Co-Co

Wheel diameter:1050 mm

Axle load:22.5 t

Locomotive weight with full service:135 t

Maximum running power of diesel engine:2760 kW

Locomotive nominal power :2940 kW

Locomotive speed(the diameter of driving wheel is calculated as 1013mm)

a) Maximum running speed:100 km/h

b) Continuous speed :19.7 km/h

Locomotive tractive effort at the wheel rim:

a) Maximum starting tractive effort:556 kN (Traction motor limit)　420 kN(adhesion limit)

b) Continuous tractive effort:369 kN(Traction motor limit)　351 kN (Adhesion limit)

Minimum curvature radius negotiated:80 m(The running speed of light locomotive is less than 5km/h)

Wheelbase

a) Wheelbase:1850 mm

b) Total wheelbase of bogie:3700 mm

c) Total wheelbase of locomotive:16080 mm

Locomotive configuration

a) Length:21860 mm

b) Width:3000 mm

c)Height:4212 mm

Fuel tank capacity:8000 L

Total lubrication oil volume:1000 L

Total water volume:1580 kg

Total sand volume:800 kg

Center line of coupler above rail top:(1040~1045) mm

Center line of buffer disc above rail top:(1060~1065) mm

Model	SDD21
Running area	Iran national railway
Purpose	Mainline freight locomotive
Maximum temperature in the hottest month	50℃
Minimum temperature in the coldest month	-25℃
Relative humidity during running conditions	95%-100%
he worst case condition	45℃、1400m
Locomotive clearance limit	UIC 505-1
Transmission mode	AC-DC transmission
Axle load	22.5 t
Gauge	1435mm
Axle arrangement	Co-Co
Wheel diameter	1050mm
Calculating locomotive weight with full service	135 t
Nominal power:	2940 kW
Maximum running power of diesel engine	2760kW
Maximum running speed(half worn driving wheel)	100km/h
Continuous speed	19.7km/h
Maximum starting tractive effort	556 kN (Traction motor limit)　420 kN(adhesion limit)
Continuous tractive effort	369 kN(Traction motor limit)　351 kN (Adhesion limit)
Minimum curvature radius negotiated	80 m(The running speed of light locomotive is less than 5km/h)
Center line of coupler above rail top	(1040~1045) mm
Center line of buffer disc above rail top	(1060~1065) mm
Wheelbase	1000 L
Total wheelbase of bogie	3700 mm
Locomotive configuration size (L×W×H)	21860x3000x4212mm
Fuel tank capacity	8000L
Total lubrication volume	1200L
Total Water volume	1580kg
Total Sand volume	800 kg