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Machine translation
1. (WO1980001783) ANTI-SKID BRAKE CONTROL SYSTEMS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001783    International Application No.:    PCT/GB1980/000030
Publication Date: 04.09.1980 International Filing Date: 22.02.1980
IPC:
B60T 13/14 (2006.01), B60T 8/36 (2006.01), B60T 8/50 (2006.01)
Applicants:
Inventors:
Priority Data:
7906551 23.02.1979 GB
Title (EN) ANTI-SKID BRAKE CONTROL SYSTEMS
(FR) SYSTEMES DE COMMANDE DE FREINS A ANTIDERAPAGE
Abstract: front page image
(EN)Anti-skid brake control systems which sense the presence of skid conditions at a hydraulically braked wheel and then relieve the break pressure at that wheel by displacing from the brake. A regulator (80) is connected in a high pressure fluid supply line so as to control the rate at which the brakes are re-applied on cessation of the skid conditions. The regulator preferably comprises a cup-shaped piston (83) reciprocable within a cylinder bore (82). A first restriction (90) of predetermined size is defined by the end wall of the piston and a second restriction of variable size is formed between a number of radial ports (98) in the bore wall and an annular recess (95) in the outside of the piston, this recess being permanently connected to the inner space (88) of the piston. Fluid flows from the variable restriction to the predetermined restriction and a pressure difference is produced across the predetermined restriction. Any increase in this pressure difference causes the piston to move against the action of a compression spring (92) to restrict the size of the variable restriction, thereby regulating the flow of fluid to a predetermined value. The regulator is suitable for use with systems of the kind which include a brake pressure modulator and with those which include a control valve to dump fluid from the brakes on occurrence of skid conditions.
(FR)Des systemes de commande de freins a antiderapage detectent la presence de conditions de derapage d'une roue freinee hydrauliquement et relachent la pression du frein de cette roue en deplacant le fluide du frein. Un regulateur (80) est connecte a une ligne d'alimentation de fluide a haute pression de maniere a commander la vitesse a laquelle les freins sont actionnes de nouveau des que les conditions de derapage disparaissent. Le regulateur comprend de preference un piston en forme de godet (83) ayant un mouvement alternatif dans un alesage cylindrique (82). Une premiere restriction (90) de dimension predeterminee est definie par la paroi extreme du piston et une seconde restriction de dimension variable est formee entre plusieurs orifices radiaux (98) amenages dans la paroi de l'alesage et un evidement annulaire (95) dans la partie exterieure du piston, cette evidement etant relie en permanence a l'espace interieur (88) du piston. Le fluide s'ecoule de la restriction variable a la restriction predeterminee et une difference de pression se produit au niveau de la restriction predeterminee, Toute augmentation de cette difference de pression provoque le deplacement du piston contre l'action d'un ressort de compression (92) pour restreindre la dimension de la restriction variable, reglant ainsi le debit de fluide a une valeur predeterminee. Le regulateur convient a des systemes du genre comprenant un modulateur de pression de freins et a ceux comprenant une soupape de commande pour vider le fluide des freins lors de l'apparition de conditions de derapage.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)