Rolling Stock and Manufacturing More matched contact surface between the wheel and rail results in less wear of wheel and rail.
New bogies create value for customers CRRC has researched and developed a new generation of high-performance series-radial bogies with auxiliary frames. China-based CRRC’s new bogies set out to solve the problems faced by traditional railway wagons, such as serious wear of wheel to rail, low environmental protection performance, and poor hunting stability, and improving the economy of railway transportation as a result. Up to now, about 1000 wagons have been equipped with the radial bogies in Australia, and they are creating more economic value to customers. TECHNICAL FEATURES • More matched contact surface between the wheel and rail lead to less wear of wheel and rail. The bogies use large deflection rubber cushions with “appropriate parameters”, while coordinating the radial bogie technology to further reduce the dynamic action force of wheel to rail, slowing down the wear rates of wheel and rail, extending the service lives of wheel and rail and improving the wagon’s economy of application. After several years of tracing research, CRRC found that the average wheel flange wear of radial bogies with auxiliary frame was about 33 per cent that of the bogie (with cross connecting rods) after the wheels run about 200,000km; and about 50 per cent of bogies with cross connecting rods after the wheels run about 400,000km. The metal loss after re-profiling the wheel tread is reduced on average by about 14.5 per cent of bogies with cross connecting rods after the wheels run about 450,000km, which can reduce the machining amount and machining times for re-profiling, extending the service life of wheels by 1.6 times that of bogies with cross connecting rods.
• There is less unsprung weight, lower and more reasonable distribution of wheel to rail action force. The auxiliary frame and adapter are designed individually, greatly reducing the unsprung weight, and achieve lower action force of wheel to rail. They coordinate radial bogie technology and large deflection rubber cushion technology to enable more balanced distribution of lateral action force of wheel to rail, achieving low dynamic action force performance. • The wagon has low operating resistance and better environmental protection performance. The connection between the U-shaped auxiliary frames is flexible; it coordinates the radial bogie technology and the appropriate horizontal stiffness of the large deflection rubber cushion to ensure the impact angle of wheel to rail is only 20 to 40 per cent that of the traditional three-piece cast steel bogie. This greatly reduces the operating resistance of the bogie (only 33 to 50 per cent that of the traditional bogie), and saves the energy used for dragging the wagons (5 per Type of bogie
cent that of traditional bogies), improving the environmental friendliness of the wagon. • There is more reliable connection and more safety with the riveting technology used between the adapter and the U-shaped auxiliary frame to improve the connection reliability of the two parts. The pinning limit-position technology between the cross connecting rods and the auxiliary frames eliminates escape of the traditional round pin connection completely, and improves the anti-escaping performance to ensure the safety and reliability of the wagon operating, while boosting the turnover rate and the transportation economy. • The integrated brake device fitted has wide adaptability and stronger competition than others. The product can be equipped with BAB series, DAB series, PAB series, PAB series and internationally well-known TMX, TMB-60, BFCB and other integrated brake devices. It effectively improves the braking efficiency and ensures the safety operation of wagons while reducing their tare weight to improve the economy of application.
Track gauge (mm)
Journal/ Bearing
Axle load (t)
Diameter of wheel tread (mm)
Fixed wheelbase mm
Diameter of center plate (mm)
DZ6 type
1435
6 1/2"×9"
30
915
1860
419
DZ3 type
1435
353132A
27
915
1860
375
K7 type
1435
353130B
25
840
1800
375
HZ25E-AUS type
1435
6"×11"
25
840
1800
356
HZ25-1520 type
1520
313530B
25
957
1870
354
HZF23-AUS type
1600
6"×11"
23
840
1800
356
HZ14-TWN type
1067
5"×9"
14
860
1750
394
HZ20A-THA type
1000
6"×11"
20
851
1800
305
Specifications for the bogies.
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