Abstract: A pneumatic servo for assisting with braking having a casing (10) with a cylinder (38) and a cover (40) with an axis of symmetry (X-X'). A wall structure (12) divides the interior of the casing into a front chamber (14) and a rear chamber (16). The movable wall structure (12) has a rear tubular part (22) which slides in a leaktight fashion in the cover (40) and retains a three-way valve (26) which is actuated by a control rod (30). The front chamber (14) is permanently connected to a source of vacuum while the rear chamber (16) is connected selectively to the front chamber (14) and a source of pressure through the three-way valve (26). The cylinder (38) and cover (40) being made from two identical half-shells (38,40).

Abstract: A boosted braking system for a motor vehicle having a master cylinder (200) and a pneumatic booster (100). The master cylinder (200) causes an increase in pressure of brake fluid supplied to at least one wheel brake (300). The pneumatic booster (100) is controlled by the application of an input force (F2) to a control rod (26) to actuate the master cylinder (200). A main hydraulic piston (30) of the master cylinder (200) has a hollow cylinder (32) in which a reaction piston (34) slides in a leaktight and axial direction. The reaction piston (34) receives at least the input force (F2). An elastic member (46) located between the reaction piston (34) and hollow cylinder (32) exerts an elastic force for urging the reaction piston (34) toward the master cylinder (200). The reaction piston (34) delimits within the cylinder a reaction chamber (36) which is isolated from the interior volume (V) of the master cylinder (200).

Abstract: A boosted braking device for a motor vehicle having a master cylinder (200) and a pneumatic booster (100) operated by applying an input force to an operating rod (26). The booster (100) has a rigid casing (10) which is divided by a partition (16) into at least first (12) and second (14) leaktight chambers. The partition (16) is acted upon via a difference in pressure between the first (12) and second (14) chambers on the opening of a three-way valve (24) to allow pressurized fluid to be communicated to the second chamber (14). A main hydraulic piston (30) which is located in the master cylinder (200) has a hollow cylinder (32) which is in communication with an interior volume (V) of the master cylinder (200). A secondary hydraulic piston (34) slides in a leaktight fashion inside of the hollow cylinder (32).

Abstract: The present invention relates to a system for coupling at least two control columns (2A, 2B) of a control device (DC) of a machine, especially an aircraft. The coupling system includes for each of the columns (2A, 2B), at least one operating member (13A, 13B, 14A, 14B) capable of making the column (2A, 2B) tilt about an axis, and a calculation unit (CAL) receiving information relating to the position of tilt of the columns (2A, 2B) and generating, when at least one of the columns (2A, 2B) is operated, tilt commands which are transmitted to the operating member (13A, 13B, 14A, 14B) of the other column (2A, 2B).

Abstract: The invention relates to a pneumatic brake booster using two sources of air pressure and comprising a rigid casing (3) divided by a leaktight moving partition (4) into at least two chambers (3a, 3b), it being possible for the moving partition to be urged by a difference, brought about by an actuation of the valve, between the pressures supplied to the chambers in order to drive along a pneumatic piston (5) bearing an operating valve (7), the inside (50) of this piston being separated from the second source by a purification filter (14).

Abstract: A pneumatic brake booster using first and second sources of air pressure and having a rigid casing (3) divided into at least first (3a) and second (3b) chambers by a leaktight moving partition (4). The moving partition (4) being capable of being urged by a pressure difference brought about by the actuation of a valve (7). Valve (7) having a tubular shut-off member (70) which together with an internal face (510) of a piston (5) delimits a compensation volume (74) that is permanently connected to the second chamber (3b). The shut-off member (70) of valve (7) facing first (71) and second (72) seats. The shut-off member (70) having a continuous and leaktight surface while the compensation volume (74) is connected to the second chamber (3b) by an axial piercing of a portion (8) of a greater thickness of a cylindrical wall (51) on the pneumatic piston (5).

Abstract: A device for controlling a rudder of an aircraft has at least two servo-systems each including at least one electric control input. At least one of the servo-systems is a mixed servo-system that also has a mechanical control input. When an engine fault occurs, an electric control system causes at least two of the servo-systems to simultaneously operate the rudder. When the electric control system is not operational due to an electric fault, the mixed servo-system operates the rudder based on control signals from the mechanical control input.

Abstract: A pneumatic brake booster (1) having a piston (5) which is responsive to first and second sources of air pressure. The booster (1) has a rigid casing (3) which is divided by a leaktight movable partition (4) into first (3a) and second (3b) chambers. The partition (4) including a pneumatic piston (5) which carries a control valve (7). A difference in pressure established between the first (3a) and second (3b) chambers causes the piston (5) to move within the casing (3). The inside (50) of the piston (5) is separated from the second source of air pressure by an impurities filter (14). A closing-off means (15,17) is located between an opening to the inside (50) of the piston (5) and the second source of air pressure to control an air inlet path which bypasses the impurities filter (14).

Abstract: A pneumatic booster (1) having casing (3) divided by a movable partition (3) into first (3a) and a second (3b) working chambers. The movable partition (4) being urged by a pressure differential derived from a first fluid pressure in the first working chamber (3a) and a second fluid pressure in the second working chamber (3b). The second fluid pressure is communicated to the second working chamber (3b) through the actuation of a shutter (70) by means of a plunger (8). The shutter (70) has freedom of movement with respect to the plunger (8) while being elastically urges against the plunger (8). The shutter (70) is connected to a mass (15) which is set in motion by a movement of the plunger (8). The mass (15) thereafter acts on and moves the shutter (70) away from the plunger (8) to increase the flow of the second fluid pressure to the second chamber (3b).

Abstract: A pneumatic brake booster for a motor vehicle having a rigid casing (1) with a first shell (10) which points toward the front of the vehicle and a second shell (11) which points toward the rear of the vehicle. At least one through bolt (5) fastened to the front shell (10) and rear shell (11) by respective cohesive forces which joins the front shell (10) to the rear shell (11) in an axial direction by a compressive force which tends to pull the front shell (10) toward the rear shell (11). The cohesive force between the through bolt (5) and the front shell (10) wholly consists of an elastic force exerted by the rigid casing (1) on the through bolt (5) in reaction to the compressive force exerted on the front shell (10) and rear shell (11) by the through bolt (5). The through bolt (5) has a threaded end (50) which passes through the front shell (10).

Abstract: A pneumatic-controlled device for a vacuum brake booster having a hollow piston which retains a tubular shut-off member. The tubular shut-off member interacts with a stationary seat and a movable seat to define a chamber within the hollow piston when the movable seat is in an actuation position. An orifice formed in the tubular shut-off member places the chamber in communication with a passage defined between the stationary and movable seats to reduce hysteresis experienced by movement of the movable seat.

Abstract: A master cylinder comprising a body (4) pierced with a bore (5) closed on a first side by an end (6) and on a second side by a piston (7). The piston (7) slides in the bore (5) to delimit a pressure chamber (8). The pressure chamber (8) is connected by a pressure pipe (12) to at least one brake motor through an outlet (11) therein. The chamber (8) and the pressure pipe (12) together delimiting a working volume filled with a hydraulic fluid. The working volume is partially delimited by a leak-off device (19) which is responsive to an impact to selectively allow hydraulic fluid to leak off toward the outside of the working volume.

Abstract: This boosted braking device comprises a pneumatic brake booster (1) associated with a master cylinder (2) and provided with an automatic control solenoid valve (26), this booster operating according to a mixed reaction principle and comprising a movable pneumatic piston (5) carrying a control valve (7) actuated by a rod (8), as well as a partition (4) which can be moved under the effect of a pressure difference, this movable wall (4) being mounted slidingly with respect to the pneumatic piston (5). The device of the invention makes it possible, with very few elements, to provide automatic braking without disturbing the normal operation of the booster.

Abstract: A pneumatic brake booster having a casing (10) with an axis of symmetry (X-X') divided in a leaktight fashion by a movable wall structure (12) into a front chamber (14) permanently connected to a source of low pressure, and a rear chamber (16). The rear chamber (16) is connected selectively to the front chamber (14) or a source of high pressure by a three-way valve means (36). The three-way valve means (36) is actuated by a control rod (30) capable of pressing, via a front face of a plunger (28), on a rear face of a push rod (56) secured to a reaction disc (58) when a plunger (28) slides in a bore (26) of the movable wall (12). The three-way valve (36) includes a valve element (36) located in a tubular rear part (22) of the movable wall (12) and interacts via of an annular front face (40) with a first annular valve seat (28a) formed on the plunger (28) and with a second annular valve seat (20a) formed on the movable wall (12).

Abstract: A pneumatic servo for assisting braking. The servo has a casing with an axis of symmetry which is divided in leaktight fashion by a movable wall structure into a front chamber and a rear chamber. The front chamber is permanently connected to a source of partial vacuum while the rear chamber is connected selectively to the front chamber and to air in the surrounding environment by a three-way valve. A sleeve divided an annular bore located in a projection that extends through the movable wall through the casing into a static volume and a concentric annular volume. The sleeve engages the projection to position the three-way valve in the bore. A return spring located in the static volume engages the control rod while an end plug engages the sleeve to seal the static volume from the surrounding environment. The annular volume being is respectively connected by first and second openings to the surrounding environment and bore.

Abstract: A pneumatic brake booster having a casing (10) with an axis of symmetry (X-X') divided in a leaktight fashion by a moving wall structure (12) into a front chamber (14) and a rear chamber (12). The front chamber (14) is permanently connected to a source of low pressure and the rear chamber (12) is connected selectively to the front chamber (14) or to a source of high pressure by a three-way valve (36). The three-way valve (36) is actuated by a control rod (30) capable of bearing via a front face of a plunger (28) on a rear face of a push rod (48) secured to a reaction disk (49). The plunger (28) slides in a bore (26) of the moving wall structure (12) in response to an input force applied by an operator.

Abstract: An assembly of a pneumatic brake booster (100) and a master cylinder (200) for a motor vehicle. The pneumatic brake booster (100) has a casing (20) fixed to the bulkhead (10) of the vehicle. The casing is divided in leaktight fashion by a movable wall structure (22) into a front chamber (24) permanently connected to a source of partial vacuum and a rear chamber (26) connected selectively to the front chamber (24) or to the atmosphere by a valve means (16). The valve means (16) is actuated by a control rod (14) for actuating a push rod (28). The master cylinder (200) has a body (21) formed with at least first and second flanges (38, 38'; 40, 40'). The first and second flanges (38, 38'; 40, 40') interact with corresponding screws and nuts to fix the body (21) with the casing (20) of the booster (100). The body (21) has a bore (34) for slidingly receiving at least one piston (32) which is actuated by the push rod (28) of the brake booster (200).

Abstract: A pneumatic brake booster having a casing (10) with a piston located therein. The piston has a hub (22,22') with a tubular part (24,24'), a portion of which extends in a sealed fashion through the casing (10). The hub (22,22') has an annular groove (29) which receives an internal peripherial bead (19) of a rolling seal (18) which holds a skirt (16) against a shoulder. The rolling seal (18) engages the casing (10) to define a front chamber (12) which is permanently connected to a source of depression and a back chamber (14) selectively connected to the front chamber (12) and to atmosphere via valve apparatus (22a,32a,36). The valve apparatus (22a,32a,36) is actuated by a control rod (34) capable of pressing, by way of a front face on a plunger (32), on a first face of reaction disk (40) secured to a second face on a push rod (42). The tubular part (24') of the piston is connected to the hub (22) by clipping.

Abstract: A pneumatic servo for brake boosting intended for motor vehicles. The servo having a rigid casing divided into at least two chambers by a flexible membrane. The casing being composed of at least first and second elements and having at least two tie rods for joining the first and second elements together in an inward axial direction. The tie rods respond to any force which tends to move the first and second elements apart. At least one of the tie rods is compressible should an external force be applied to move the first element toward the second element to prevent communication of the external force through the second element into an operator compartment.

Abstract: A pneumatic brake-booster having a casing with a piston located therein consisting of a hub and a skirt to define a front chamber and a rear chamber. The front chamber is connected permanently to a vacuum source and the rear chamber is connected selectively through a bore in the hub to one of the front chamber and atmosphere by a control valve. The control valve is actuated by a control rod capable of pressing through a front face of a plunger on a back face of a reaction disk fastened securely to a thrust rod. A return spring for the control rod is located between the piston and the plunger. The control valve includes a shutter valve which interacts with a first circular valve seat formed on the plunger and a second circular valve seat formed on the piston. The shutter valve is characterized by a flexible membrane having a first bead fixed in a leaktight manner to a peripheral edge of the hub and a second bead connected in a leaktight manner to an internal peripheral edge of a rigid tubular component.