A fluid pressure failure detector for detecting pressure failure in a system such as a vehicle braking system having two independent fluid circuits. The detector comprises a housing in which are formed a bore and one pressure chamber at each end of the bore, a piston assembly slidably received in the bore, ports adapted to connect each pressure chamber with a respective fluid circuit, and switching means actuated in response to movement in either direction of the piston assembly as a result of a...

A hydraulic pressure generator having a body (1) with a first bore (11) therein for receiving a cylinder (21) of a piston assembly (2) to define a pressure chamber (12). The cylinder (21) has a second bore (211) for receiving an auxiliary piston (22) which defines a variable volume compensation chamber (23). The compensation chamber encloses a deformable member (5) which is adapted to exert an elastic force between the auxiliary piston (22) and a closed end (210) of cylinder (21). The compensati...

A master cylinder for a vehicle braking system. The master cylinder including a housing defining a bore therewithin with a piston slidably mounted in said bore. The piston head and the housing bore define a pressure chamber in communication with at least one brake actuator. A conventional annular ring cooperates with the wall of the housing bore and with a radial surface of the piston head for controlling fluid communication between a supply chamber of the master cylinder which communicates with...

A vacuum brake booster and hydraulic master cylinder arrangement with lost-motion-eliminating abutment between the vacuum booster push rod and the master cylinder piston. The vacuum booster has an input rod, a valve, a power piston, and an adjustable length output push rod. A first spring biases the power piston to the rest position but exerts a force less than the counter-force exerted by atmospheric pressure on the input side portion of the power piston extending from the booster housing. A se...

A fluidic machine has a fixed body, an external orbital member rotatable around a first rotational axis and internal gear teeth including a first teeth number, a transmission member rotatable around a second rotational axis, an internal orbital member supported by the transmission member, having external gear teeth including a second teeth number different from the first teeth number and meshing with the internal gear teeth of the external orbital member, thus determining among the gear teeth of...

A safety valve for isolating a portion of a service conduit from a vacuum generator should a leak occur in that portion of the service circuit. The safety valve has a housing with a chamber therein. The chamber has an inlet port connected to the service circuit and an outlet port connected to the vacuum generator. A wall member located in the chamber is biased by a spring toward a first position whereby the vacuum generator is connected to the service circuit. Should a leak occur in the service ...

The invention relates to a failure detector for a dual hydraulic circuit such as a dual brake circuit in a motor vehicle. The detector comprises a movable piston assembly so as to define in a bore on opposite sides thereof two pressure chambers. Switch means are provided to make electrical contact when the movable assembly moves in certain direction from a central idle position due to pressure imbalance between the chambers. The movable assembly comprises a sleeve acting with the switch means an...

A rotary pump having a stator (1) pierced with a housing (11) delimited by a cylindrical sidewall (110). A cylindrical rotor (2) located tangentially inside of the housing (11) off-center to an axis (X). The cylindrical rotor (2) is driven in rotation about the axis (X). A vane which diametrally passes through the rotor (2) has first and second opposite edges (31,32). The first and second opposite edges (31,32) bear against the sidewall (110) and are separated from one another by a distance subj...

The hydraulic master-cylinder of the invention is of the kind having a valve ring made of elastomeric material mounted on the head of a piston adjacent to the pressure chamber. The master-cylinder further includes a safety valve in the pressure chamber. The safety valve is guided on the piston head and is adapted to sealingly cooperate with both one face of the valve ring and a shoulder provided on the piston head. The safety valve is biased toward the valve ring by a spring abutting on a stop f...

A fluid reservoir is made of non magnetic material and comprises two chambers communicating with a common well. A float is disposed in the well and bears a permanent magnet, and a switch is disposed outside the reservoir. The switch is actuated by the magnetic field of the magnet when the float is at a predetermined level in the reservoir.