Landing gear electro-hydraulic brake system

B - Operations – Transporting – 64 – C

Patent

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Details

B64C 25/42 (2006.01)

Patent

CA 2116839

he invention involves an electro-hydraulic braking mechanism for aircraft landing gear. The device consists of two hydraulic pressure sources that each feed a hydraulic circuit, via brake command plates, connected to the brakes of both sets of wheels. A circuit incorporating two shuttle valves links one electrovalve controlled electrically by the steering unit and one progressive dual dispenser controlled mechanically by the brake pedals, to a plate input. A second circuit links the electrovalve directly to a second input for each of the plates. Each plate includes two symmetrical internal circuits with a servovalve for each brake concerned, which are interconnected respectively by a control valve. Should the circuit malfunction, the servovalves associated with the other circuit will then provide control over braking and antiskid using a paired tandem mode, with automatic reconfiguration.

L'invention concerne un dispositif de freinage électro-hydraulique d'un train de roues d'aéronef. Le dispositif comporte deux sources de pression hydraulique alimentant chacune un circuit hydraulique menant, par l'intermédiaire de platines de commande de freinage, aux freins des deux groupes de roues. Un circuit relie, par deux clapets navettes, soit une électrovanne commandée électriquement par l'unité de pilotage, soit un double distributeur progressif commandé mécaniquement par les pédales de frein, à une entrée des platines. Un deuxième circuit relie directement une électrovanne à une deuxième entrée de chacune desdites platines. Chaque platine inclut deux circuits internes symétriques ayant une servo-valve par frein concerné, qui sont interconnectés au niveau d'un clapet commandé respectif. En cas de panne sur un circuit, les servo-valves associées à l'autre circuit permettent alors un contrôle du freinage et de l'anti-patinage selon un mode tandem appairé, avec une reconfiguration automatique.

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