Common problems associated with the design and utilisation of disc brakes often relate to the effects of pad loading. Non-uniform pad loading can result in taper wear of the linings, which can result in greatly reduced pad life and potential rotor damage in extreme cases. A multibody dynamics model has been utilised to perfom an investigation into caliper geometry changes that could be employed to effectively improve pad loading uniformity. This investigation explored modifications to caliper finger position fore and aft (relative to the housing centreline), and piston offsets from the caliper centreline. Pressure distributions were measured during the constant torque region of the brake applies. Multibody simulations have been utilised in many automotive applications and analyses of this type have been applied to resolve a number of interesting braking problems. A goal of this investigation was to look at minor changes to caliper housing geometry to improve pad loading characteristics. This study involved a complete system model of a twin piston medium truck disc brake. This particular brake design utilises two 73 mm pistons with a 380 mm diameter rotor, and is designed for applications up to a gross vehicle weight of 146.8 kN. The model is composed of twelve separate components, representing the anchor, tie bar, pistons, pads, guide pins, guide pin locating bolts, caliper housing, and rotor. The geometry, mass, and inertia of each component are taken from the solid models of production hardware. The geometric information is complete, including dimensional tolerances on all components and features. Joints, contact definitions, bushings, and motions are applied to the dynamics model, representing the physical characteristics of the actual hardware. The individual components of the assembly are attached using 163 contact and joint entities.
Evaluation of disc brakepad pressure distribution by multibody dynamic analysis
Abschätzung der Scheibenbremsen-Druckverteilung durch dynamische Mehrkörpersystemanalyse
2002
9 Seiten, 11 Bilder, 9 Quellen
Conference paper
English
Evaluation of disc brake pad pressure distribution by multibody dynamic analysis
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