Pneumatic timer for delaying the application of an emergency...

B - Operations – Transporting – 60 – T

Patent

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Details

B60T 13/66 (2006.01) B60T 8/18 (2006.01) B60T 8/32 (2006.01) B60T 17/20 (2006.01) B60T 17/22 (2006.01)

Patent

CA 2624113

A pneumatic emergency brake release timer comprises a high capacity transfer valve, a timing reservoir in communication with the pilot port of the high capacity transfer valve (50), the check valve (64) and choke circuit (62) providing parallel connections between the main source of pressure and the reservoir through a check valve and opposite flow through a dissipating choke. A pneumatic relay valve controls the pressure to the brake cylinders. The high capacity transfer valve (50) can select a pilot pressure (48) to the pneumatic relay valve from two different pressure sources : a controlled pressure and an emergency pressure. Normally a controlled pressure is selected, e.g. a modulated pressure for wheel slip control. In the case of emergency braking, the timing reservoir (54) maintains the high capacity transfer valve (50) during a present time in a position wherein the controlled pressure is still selected. Thereafter, the emergency pressure is selected, thereby bypassing the pressure controller (44). The advantage is that wheel slip control is still possible during emergency braking for a present time, using pneumatic elements only.

Un circuit de temporisation pneumatique de relâchement des freins de secours comprend un robinet de transfert à haute capacité, un réservoir de retardement en communication avec l'orifice pilote du robinet de transfert à haute capacité (50), un clapet de non-retour (64) et un circuit du volet de départ (62) assurant des connexions parallèles entre la source de pression principale et le réservoir à travers un clapet de non-retour, et un contre-courant à travers un volet de départ de dissipation. Une valve-relais pneumatique commande la pression des cylindres de freinage. Le robinet de transfert à haute capacité (50) permet de sélectionner une pression pilote (48) à destination de la valve-relais pneumatique entre deux sources de pression différentes : une pression commandée et une pression de secours. A l'état normal, la pression commandée est sélectionnée, à savoir une pression modulée pour contrôler le dérapage des roues. En cas de freinage de secours, le réservoir de temporisation (54) maintient le robinet de transfert à haute capacité (50) pendant un temps présent dans une position dans laquelle la pression commandée est toujours sélectionnée. La pression de secours est ensuite choisie en contournant le régulateur de pression (44). L'avantage consiste en ce qu'il est toujours possible de contrôler le dérapage des roues pendant le freinage de secours pendant un temps présent en utilisant les éléments pneumatiques seulement.

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