AUTOMOTIVE DESIGN
TESTING THE LIMITS OF HOSES Markus Linzmaier introduces some tough lines for active chassis control
sporty driving style. In the future, lowering the body for motorway driving is intended to reduce air resistance and, with it, fuel consumption and pollutant emissions. In a recent application of this sort, the stresses
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to which the material was subjected by the extremely tight bending radii required posed particular major challenges for the hose developers. Technology expert Continental was called upon to work in close consultation with the end customer to make this development possible. A dedicated test rig was developed to identify where the hoses’ limits lie. The rig approximately simulates both the real chassis
utomakers are currently working on active chassis control systems. Such systems guarantee the end customer a high level of comfort, increase safety and, at the same time, enable a
motions and the temperature curve. The first step towards this was to create a virtual test rig model. In this, the installed position of the lines in the vehicle was transmitted directly from the 3D CAD program to the test rig.
SHIFTING THE LIMITS The polyamide inner lining of the hoses was also modified again to ensure that the requirements relating to the high resistance to temperature and pressure (160 bar continuous pressure, and up to 180 bar briefly, in the range from -40°C to 130°C) are also met. In conjunction with the results from the motion test rig, this enabled the limits for the bending radii of hydraulic hoses to be considerably shifted. That is because the tests showed that, even under continuous loading, the hoses can be bent substantially more than the previous calculations had predicted.
To identify where the hoses’ limits lie, a test rig that simulates chassis motions and temperature curve was developed
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