The axle guide bearing connects the wheel set to the bogie longitudinally and transversely. Conventional axle guide bearings show high longitudinal rigidity to guarantee safety at fast straight-ahead speeds. This comes at the expense of driving behavior on curves. In a single part, the passive HALL hydraulic axle guide bearing combines the optimal low rigidity for curves with high longitudinal rigidity for high speeds on straightaways.
The new generation of the hydraulic axle guide bearing, HALL 2.0, is an actively controllable axle guide bearing.
As with the passively acting axle guide bearing with a hydraulic damping channel, a hydraulic axle guide bearing comes into use as well. With passive HALL, the rail car‘s weight forces, in concert with the rail’s forces on the wheel set, have an impact on turning for curves. But with active HALL, the bearing is changed by external pressure.
On the basis of internal information (pressure and position) and by means of hydraulic pressure in its chambers, the axle guide bearing can be adjusted so that it is force-free outwardly.
Alternatively, HALL's control specifications can also be generated outside the system.
For example, from knowledge about the course of the route. GPS, programmed maps or cameras at the front of the train evaluate the route’s course, including its curves, in advance. This is ideal for the fixed routes that are common in rail transportation. The information is passed on to a control unit that, with the help of a hydraulic system, adjusts the bearing for the next radius to be driven. As a result, the wheel is already at the correct angle for the next curve and grinds even less against the rail. The system also ensures better wheel adjustments on the very narrow curves that streetcars and subways negotiate.
The high rigidity necessary for stable operation in case of higher-frequency excitation continues to be produced passively.
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