Bogie Presses

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The Bogie Press (or Bogie Testing Stand) is designed to simulate the vehicle load on the bogie to allow the ride height to be correctly adjusted before fitting the bogie to the vehicle and to check that the load distribution across the 4 wheels is even.  Setting the bogie up correctly in the workshop means that once it is fitted to the vehicle the ride height will be correct and there will be no further delay in returning the vehicle to traffic.

The complexity of the equipment depends on the functional requirements in terms of applying the loads and measuring the results and the accuracy required from the Press.

The structure of the press comprises a portal frame and a section of rails to support the bogie on its wheels.  The bogie press is often surface mounted to avoid the need for civil engineering works, but can also be mounted so that the feed in / out rails are flush to the workshop floor.

In its simplest form, the bogie press uses a single hydraulic cylinder to apply the simulated load, with balance beams to distribute the load across the bogie suspension points.

To refine the system, two cylinders can be used which can be positioned independently over the bogie suspension points and can then also apply different loads to each of these points to simulate variations in actual vehicle weight distribution.

The loads applied by the cylinder(s) can be measured using hydraulic pressure, but for the purposes of improved accuracy, electronic load cells are normally used.

Wheel load measurement by means of load cells mounted in the track sections allows the tester to ensure that the applied loads are correctly distributed by the bogie suspension.

Height measurement is an important function of the Bogie Press.  The heights of the suspension points with the test load applied can be measured manually but are usually measured by linear transducers mounted on the hydraulic cylinders.  An independent measuring system separate from the hydraulic cylinders can be fitted for even greater accuracy.

As well as the built in load and height measurements, the Bogie Press has an integrated control and monitoring system that produces a report for each of the bogies to be tested.  The test results are stored on a database using the bogie’s unique reference number and this information can also be linked through to the operator’s own IT / database system to allow remote access to the test data.

You can visit the BBM web site here.

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