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A fully hydraulic brake booster/master cylinder unit (10) for a vehicle brake system has a housing (12) and a bore (14) which is formed therein and in which is arranged sealingly and displaceably a primary piston (16) which is coupled to an input member (40) for transmitting an actuating force to th

A fully hydraulic brake booster/master cylinder unit (10) for a vehicle brake system has a housing (12) and a bore (14) which is formed therein and in which is arranged sealingly and displaceably a primary piston (16) which is coupled to an input member (40) for transmitting an actuating force to the primary piston (16). Located in the bore (14) are a first pressure chamber (22), one boundary wall of which is formed by one end wall (20) of the primary piston (16), and a first booster chamber (46), one boundary wall of which is formed by the other end wall (50), located opposite the end wall (20), of the primary piston (16). The first booster chamber (46) has an inlet for hydraulic fluid under pressure which is used for boosting the actuating force. In order to bring about additional brake boosting comfortably and as required, there is arranged in the bore (14) a second booster chamber (48), to which hydraulic fluid under pressure can be supplied independently of the first booster chamber (46). In a preferred embodiment, an auxiliary piston (54) which is arranged sealingly and floatingly in the bore (14) forms with one end wall (52) a further boundary wall of the first booster chamber (46) and with its opposite other end wall (56) a boundary wall of the second booster chamber (48).

대표청구항 ▼

[ What is claimed is:] [1.]1. A fully hydraulic brake booster/master cylinder unit for a vehicle brake system, witha housing and a bore which is formed therein and in which is arranged sealingly and displaceably a primary piston which is coupled to an input member for transmitting an actuating force

[ What is claimed is:] [1.]1. A fully hydraulic brake booster/master cylinder unit for a vehicle brake system, witha housing and a bore which is formed therein and in which is arranged sealingly and displaceably a primary piston which is coupled to an input member for transmitting an actuating force to the primary piston,a first pressure chamber which is arranged in the bore and one boundary wall of which is formed by one end wall of the primary piston, anda first booster chamber which is arranged in the bore and one boundary wall of which is formed by the other end wall, located opposite the end wall, of the primary piston, with an inlet for hydraulic fluid under pressure in order to boost the actuating force,a second booster chamber arranged in the bore, wherein the brake booster/master cylinder unit is adapted to supply hydraulic fluid under pressure to either one of the first and second booster chambers independently of each other.