New CRRC bogies create value

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 defl ection 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 fl ange 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-profi ling 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-profi ling, 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 defl ection 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 fl exible; it coordinates the radial bogie technology and the appropriate horizontal stiffness of the large defl ection 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 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 fi tted 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 effi ciency and ensures the safety operation of wagons while reducing their tare weight to improve the economy of application.

Type of bogie 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 K7 type 1435 353132A 27 915 1860 375

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

Specifi cations for the bogies.