REGULATEUR DE TAUX D'AMPLIFICATION POUR SURPRESSEUR DE LIQUIDE

REGULATEUR DE TAUX D'AMPLIFICATION POUR SURPRESSEUR DE LIQUIDE.UN GRADIN 50 FORME SUR L'ARBRE 6 D'ENTREE DELIMITE AVEC LE BOUCHON 4 DU CORPS 1 DE L'AMPLIFICATEUR UNE CHAMBRE DE PRESSION 51 PRESENTANT UNE SURFACE B1 REPONDANT A LA PRESSION DU FLUIDE; UN DISTRIBUTEUR 55 ETABLIT SELECTIVEMENT UNE COMMUNICATION ENTRE LA CHAMBRE 51 ET UNE CHAMBRE 8 DE TRAVAIL OU UN RESERVOIR 40 DE POMPE D'ALIMENTATION EN HUILE SOUS PRESSION.APPLICATION : PRODUIRE, POUR UN FREIN OU ENGRENAGE, UNE PRESSION D'HUILE A UN NIVEAU CORRESPONDANT A L'AMPLIFICATION D'UNE ENTREE LIEE A LA MANOEUVRE D'UNE PEDALE DE FREIN OU D'EMBRAYAGE D'AUTOMOBILE. A liquid pressure booster as may be used in a brake booster or clutch booster produces an oil pressure of a level which corresponds to the magnitude of an input applied to an input shaft. The oil pressure acts upon a power piston, which then produces an amplified output in response to a small input. The oil pressure is also returned to act upon the input shaft so as to provide a reaction to the input. The invention provides a step in at least one of the input shaft and the power piston so that the combination of the step and the housing defines a pressure chamber having a pressure responsive surface at the step. A flow path switching valve selectively establishes a communication of the pressure chamber with either the power chamber or a reservoir. When the switching valve is operated, the pressure responsive area of the input shaft which is acted upon by the oil pressure can be changed, thereby changing the magnitude of the reaction transmitted to a driver. The pressure responsive area of the power piston which is acted upon by the oil pressure may be changed, thereby changing the magnitude of an output. The booster ratio of liquid pressure booster may be changed according to the preference of a driver or the conditions under which the braking action is applied.