Abstract: A valve intended to disconnect, in specific circumstances, the braking of the front wheels, and/or of a trailer whose braking system is connected through a trailer braking valve, for the braking system of a farm tractor or similar vehicle which comprises two master cylinders, operated by two separate braking pedals, directly controlling the braking of the rear wheels, and controlling the braking of the front wheels and/or the braking device of the trailer through the disconnection valve. The disconnection valve includes a body, a first and second inlet connections connected to the two master cylinders, and a delivery connection connected to a braking circuit of the front wheels and/or to the trailer brake valve. The valve body has a bore wherein is installed one movable piston subjected to the action of pressure applied to the first inlet connection.

Abstract: A suction system comprising a suction pump (1) having at least one suction connection (2,2?,2?) and a delivery connection (3), a receiving reservoir (4) connected to the delivery connection (3), connecting pipings from a suction connection (2,2?) to a first space (7) from which a first fluid (8) should be sucked, and connecting pipings from the delivery connection (3) to the receiving reservoir (4), characterized in that the system further comprises a connecting piping (14,15,16) extending from a second space (10), from which a second fluid (11) should be sucked, to a suction connection (2,2?) of the pump (1), and comprises a device (12) disposed for causing an intermittent operation of the second fluid suction by the pump (1), responsive to the level reached by the second fluid (11) in the second space (10).

Abstract: A device for controlling the activation of an apparatus by a motor, intended to be inserted between, the operation output of the motor and the operation input of the apparatus whose activation is to be controlled. The device includes: —a blade pump having a rotor, at least one blade carried by this rotor and a rotary body forming a pumping chamber missing an outlet, and one of the component parts, among the rotor and the rotary body, being connected to the operation output of the motor, whilst the other of these component parts is connected to the operation input of the apparatus to be controlled; —and a supply intended to supply liquid to the pumping chamber.

Abstract: A braking system for a vehicle having two pairs of wheels, has two master cylinders operating as pumps, wherein each master cylinder is operated by its own brake pedal and controls the braking on one rear wheel, as well as on the front wheels through a valve for the disconnection of the front vehicle braking. Each master cylinder is of the tandem type including two sections, the first section controlling the braking of the front wheels through the valve, whereas the second section controls the braking of that rear wheel, being a part of the pair of rear wheels, which is associated with the master cylinder. The first sections of both master cylinders are supplied by a first oil reservoir and the second sections of both master cylinders are supplied by a second oil reservoir at least partially independent from the first oil reservoir.

Abstract: 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 the two orbital members spaces whose volume is variable during rotation. One of the orbital members is mounted axially displaceable and is pushed by an elastic push member in the direction producing a more extended engagement with the other orbital member, and a piston, mounted displaceable within the non-axially displaceable orbital member and resting against the axially displaceable orbital member, is subjected, to the pressure of the high pressure connection.

Abstract: 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 the two orbital members spaces whose volume is variable during rotation. One of the orbital members is mounted axially displaceable and is pushed by an elastic push member in the direction producing a more extended engagement with the other orbital member, and a piston, mounted displaceable within the non-axially displaceable orbital member and resting against the axially displaceable orbital member, is subjected, to the pressure of the high pressure connection.

Abstract: A hydraulic braking device for a self-propelled vehicle, particularly for agricultural vehicles, for example tractors comprising a master cylinder and a hydraulic brake booster. An actuating rod is mounted to sealingly, slide within a hydraulic boost piston that separates a hydraulic boost chamber into a front chamber and a rear chamrber. At rest the first and second chambers are in communication and filled with a same hydraulic fluid at high pressure. During a brake application, communication between the front and rear chambers is interrupted and the high pressure fluid in the front chamber communicatecd to a pressure chamber in the master cylinder to initiate a brake application and to allow the high pressure fluid in the rear chamber to act on the boost piston and develop a force that acts on an operating piston to further develop pressurized fluid in the pressure chamber during the brake application.

Abstract: A vane cell vacuum pump has a rotor, in which a plastic vane, which with at least terminal part engages the inner wall of the jacket of a pump housing, is guided longitudinally. The body of the vane comprises a duroplastic and is united with the terminal part, of thermoplastic by an injection-molding operation. With the material comprising the body, high mechanical strength is attained, while with the material of the terminal part, high wear resistance and a low coefficient of friction are attained.

Abstract: A vane cell vacuum pump (10) has a rotor (13), in which a plastic vane, which with at least terminal part (22, 23) engages the inner wall (16) of the jacket of a pump housing (11), is guided longitudinally. The body (21) of the vane (15) comprises a duroplastic and is united with the terminal part (22, 23), of thermoplastic, by an injection-molding operation. With the material comprising the body (21), high mechanical strength is attained, while with the material of the terminal part (22, 23), high wear resistance and a low coefficient of friction are attained.

Abstract: 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 compensation chamber (23) communicates with the pressure chamber (12) through a restriction (221) formed in a longitudinal duct (222) of the auxiliary piston (22). A sealing member (4) borne by a portion (222) of the auxiliary piston (22) closes the pressure chamber (12) such that the elastomeric member (5) dampens pressure differences between the pressure chamber (12) and compensation chamber (23).

Abstract: 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 subjected to variations during rotation of the rotor (2). The vane (3) is made of a thin sheet of material which offers elastic resistance to bending. The thin sheet has an undulation part (33,34) which absorbs such variations in distance experienced by the first and second opposite edges (31,32) of the vane (3).

Abstract: The distributor is used for supplying a fluid coming from a source of fluid under pressure and under a pressure which is a function of the pressure of a control fluid. The distributor comprises, in a bore (3) made in a body (1), a double valve consisting, on the one hand, of a first piston (21), one end of which defines with a first plug (5) a control chamber (23) receiving the control fluid, while the other end (27) is pierced with a conduit (29) connected to a reservoir of fluid under low pressure (11), an annular chamber (31) surrounding the first piston (21) and being connected to the consumer circuit of the distributed fluid, and, on the other hand, of a disk (33) forming a shutter and resting on a circular seat (35) stationary relative to the body (1) by way of a return spring (43).

Abstract: The present invention relates to a pneumatic brake booster assembly for a vehicle comprising a brake booster (10) formed from two shells (18; 37), a master-cylinder (14) mounted on the booster (10), a brake pedal (20) operatively linked to the booster (10) and mounted on a support bracket (22). According to the invention, one of the shells (18; 37) of the brake booster (10) is formed by a plate (26) upon which is mounted the support bracket (22), the plate (26) being destined to form a part of a firewall (12) of the vehicle.

Abstract: A hydraulic actuator (1) with automatic wear take-up, is formed with a first piston (17) sliding in a blind bore (13), a second piston (33) in a bore made in the first piston, and an output rod (3) bearing on the second piston. A first chamber (27) is formed between the blind bore and the first piston and a second chamber (37) is formed between the bore and the second piston. A piece (19) having a shoulder (23) is fixed, on its side of smaller diameter, to an end (21) of the first piston confronting the first chamber, forming an annular space. The annular space contains an annular gasket (39) and stop (41), so as to divide the first chamber into two volumes (43, 45), one (45) connected to a pressure generator (7) and the other (43) communicating with the second chamber through a duct (47) made in the end of the first piston. The two volumes communicate with one another, at rest, via a passage provided between the gasket, the stop and the piece.

Abstract: A socket (21) for retaining a pivot-forming spherical head (3) of a rod (1) in a cavity (5) is of substantially cylindrical shape having an annular groove (9). It consists of a first part (23) of hemispherical shape matched to the spherical head (3) a second part (25) of cylindrical shape matched to the shape of the cavity (5) and a third part (27) of substantially frustoconical shape, the free end (29) of which has a diameter larger than that of the cavity (5), longitudinal slots (31) being made in the second and third parts (25, 27), and the socket (21) being produced from an elastic material, such as a hard thermoplastic.

Abstract: A bifluidically controlled distributor of a fluid coming from a first source (11) of fluid under high presure, comprises, in a blind bore (1) made in a body, a sliding piston (3) defining, with a plug of the bore, a first control chamber (5) connected to a first source of control fluid, a slide (9) ensuring communication between the first source (11) of fluid under high pressure or a reservoir (13) of fluid under low pressure, and an outlet conduit (15) for the distributed fluid. The bore (1) and the piston (3) are stepped correspondingly so as to determine between them a reaction chamber (25) connected permanently to the outlet conduit (15) and a second control chamber (21) is formed between the slide (9) and the piston (3) and is connected to a second source of control fluid.

Abstract: The brake booster comprises a housing (10) in which is displaced a driving piston (12) having a hub (14) and separates a front chamber (16) from a rear chamber (18), the front chamber (16) is connected to a source of fluid under a first pressure, the rear chamber (18) is capable of being connected to a source of fluid under a second pressure, and the driving piston (14) is capable of being displaced from a rest position in response to the establishment of a difference between the first and second pressures between the two chambers (16, 18) and the pressure difference is controlled by a valve mechanism (20) associated with input control members (34, 62, 60). The connection (62) between the rear chamber (18) and the source of fluid under the second pressure is made by the input control members (34, 62, 60).

Abstract: The hydraulic proportioning valve comprises a body (10) having a stepped bore (12) which receives a cylindrical piston (22) biased toward a rest position by a spring (40), and an inlet (16) and an outlet (14) communicating with the bore (12). The piston (22) includes a part (30) with an adjacent valve member (42). The valve member (42) includes a central opening into which the part (30) may be received slideably and sealingly. The sealing engagement between the part (30) and valve member (42) is maintained even though a pressure differential across the valve member (42) may cause the valve member (42) to be displaced in the bore (12).

Abstract: 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 second spring urges the cylinder piston into contact with the push rod. This second spring is stronger than the first spring so that when vacuum is applied in the rest position the action of the two springs exerts a net force sufficient to balance the force exerted on the power piston exterior by atmospheric pressure and also maintains the push rod in constant contact with the master cylinder piston to minimize the overall actuation lost stroke of the assembly.

Abstract: The master cylinder (10) comprises a seal cup (24) made from an elastomeric material assembled with axial and radial play around the head (18) of the piston (16). A stop ring (40) slidably received in the bore (14) permits to unseat the seal cup (24) from the shoulder (30) of the piston in order to connect the supply chamber (28) and the pressure chamber (26). When the piston (18) is displaced towards the latter, it displaces the stop ring (40) by the cooperation of two conical surfaces (54 and 56), the seal cup (24) being supported on a flat surface, composed of the radial shoulder (30) of the piston and the radial face 42 of the stop ring (40) substantially continuous.