Abstract: A vacuum brake booster (10) is described, having a vacuum chamber (16) and a working chamber (18) separated from one another by a movable wall (14), and a control valve (20), which comprises a housing (12) coupled workingly to the movable wall (14) and which to achieve a pressure difference at the movable wall (14) is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18) in dependence upon the displacement of an actuating piston (28). The vacuum brake booster (10) has an emergency braking aid comprising a permanent magnet (38) and an armature (36), which cooperates with the permanent magnet (38) and is resiliently biased counter to actuating direction and during an emergency braking operation is drawn into abutment with the permanent magnet (38), with the result that the control valve (20) is held open for the supply of atmospheric pressure to the working chamber (18).

Abstract: A vacuum brake booster (10) is described, having a vacuum chamber (16) and a working chamber (18) separated from one another by a movable wall (14), and a control valve (20), which comprises a housing (12) coupled workingly to the movable wall (14) and which to achieve a pressure difference at the movable wall (14) is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18) in dependence upon the displacement of an actuating piston (28). The vacuum brake booster (10) has an emergency braking aid comprising a permanent magnet (38) and an armature (36), which cooperates with the permanent magnet (38) and is resiliently biased counter to actuating direction and during an emergency braking operation is drawn into abutment with the permanent magnet (38), with the result that the control valve (20) is held open for the supply of atmospheric pressure to the working chamber (18).

Abstract: A pneumatic brake booster (10) has a booster housing (12), the interior of which is subdivided by at least one movable wall (14) into a vacuum chamber (16) and a working chamber (18). Along an axis (A) a control valve (20) for controlling a pneumatic pressure difference acting upon the movable wall (14) projects into the booster housing (12). The movable wall (14) is workingly connected to the outside of a substantially cylindrical control valve housing (22), in that a collar (34) of a plate (30) associated with the movable wall (14) is deformed along its periphery at least in sections radially into the control valve housing (22). In order to simplify manufacture of the brake booster (10), in the portion (36) of the control valve housing (22) overlapped by the collar (34) of the plate (30) a plurality of recesses (40) are provided, which are spaced apart from one another in peripheral direction and into which the collar (34) of the plate (30) is radially deformed.

Abstract: A vacuum brake booster comprising a vacuum chamber (16) and a working chamber (18), separated by a movable wall (14) coupled to a housing (22). A control valve (20) includes a first valve seat (40) formed on a displacement valve member (38) and cooperating with a first valve seat member (42), to control a supply of atmospheric pressure to the working chamber. A rear side of the valve member is constantly subjected to pressure in the working chamber. When the valve member is displaced more than a predetermined distance in the actuating direction relative to the housing, a front side of the valve member is subjected to pressure in the vacuum chamber, such that a differential pressure acts on the valve member, to hold the valve member in a displaced position until pressure equalization between the first and rear sides of the valve member is effected.

Abstract: A vacuum brake booster (10) is described, comprising a vacuum chamber (16) and a working chamber (18) separated from each other by a movable wall (14), as well as a control valve (20) which comprises a housing (22) coupled workingly to the movable wall and which is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18) in dependence upon the displacement of an input element (26) of the brake booster (10) to achieve a pressure difference at the movable wall (14). The vacuum brake booster (10) has a sensing disk (30), which is disposed in an axially displaceable manner inside the control valve housing (22), as well as a coupling device (66), which introduces forces acting counter to the actuating direction upon the sensing disk (30) in a coupled position into the control valve housing (22) and in an uncoupled position via an actuating piston (28) into the input element (26).

Abstract: Vacuum brake booster with mechanical emergency braking aid A vacuum brake booster (10) is described, comprising a vacuum chamber (16) and a working chamber (18) separated from each other by a movable wall (14). The vacuum brake booster (10) includes an emergency braking aid comprising a permanent magnet (38), which is disposed in the control valve housing (22), and an armature (36A) which cooperates with the permanent magnet (38) and in the event of emergency braking is drawn into abutment with the permanent magnet (38), with the result that a control valve (20) is held open for the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18). The permanent magnet (38) and the armature (36A) form a two-component magnetic module (36A, 38), of which a first component is rigidly coupled to an actuating piston (28) of the brake booster (10).

Abstract: A vacuum brake booster (10) has a vacuum chamber (18) and a working chamber (20), which are separated in a pressure-proof manner from one another by a movable wall (16). A control valve (22) having a housing (24), which is workingly coupled to the movable wall (16) and in which a first valve seat (64) is disposed, in order to achieve a pressure difference at the movable wall (16) controls the supply of at least atmospheric pressure to the working chamber (20) in dependence upon the displacement of an input element (26), which is coupled to the first valve seat (64), of the brake booster (10). Disposed in the control valve housing (24) is an armature (38), which cooperates with a permanent magnet (40) and which is coupled on the one hand to the input element (26) in actuating direction and on the other hand to the first valve seat (64).

Abstract: A vacuum brake booster (10) comprises a vacuum chamber (16) and a working chamber (18) which is separated in a pressure-tight manner from the latter by a mobile wall (14). In order to obtain a pressure difference at the mobile wall (14), a control valve (20) is provided which comprises a housing (22) coupled in a force-transmitting manner to the mobile wall (14) and a first valve seat (40), which is disposed in the housing and which, in co-operation with a first valve sealing member (42), controls the supply of atmospheric pressure or overpressure to the working chamber (18) in response to the displacement of an input member (24), which is coupled to the first valve seat (40), of the brake booster (10) in order to obtain a pressure difference at the mobile wall (14). The first valve seat (40) is formed at a displaceable valve member (38) which is coupled to the input member (24) in the actuating direction of the brake booster (10).

Abstract: A vacuum brake booster (10) has a vacuum chamber (18) and a working chamber (20) separated from one another in a pressure-proof manner by a movable wall (16). A control valve (22), which comprises a housing (24) workingly coupled to the movable wall (16), has a first valve seat (50), which is disposed in the housing (24) and to achieve a pressure difference at the movable wall (16) is capable of controlling the supply of at least atmospheric pressure to the working chamber (20) in dependence upon the displacement of an input element (26) coupled to the first valve seat (50). For improved boosting of the brake force during emergency braking operations, an armature (38), which cooperates with a permanent magnet (40), is provided in the control valve housing (24) and is rigidly coupled on the one hand to the actuating element (26) in actuating direction and on the other hand to the first valve seat (50).

Abstract: A vacuum brake booster (1) having a control valve (6) with a housing (7) workingly coupled to a movable wall (5) is described. For improved braking force assistance during emergency braking operations an armature (18) cooperating with a permanent magnet (19) is provided in the control valve housing (7) and coupled in actuating direction to an actuating element (8). The armature (18) is spring-biased counter to actuating direction. For adjusting the distance between the armature (18) and the permanent magnet (19) in the non-actuated state of the vacuum brake booster (1), the axial position of the permanent magnet (19) relative to the control valve housing (7) and/or the distance between the armature (18) and a valve seat (10) is adjustable.

Abstract: Vacuum brake booster with mechanical emergency braking assistance and improved noise damping A vacuum brake booster (10) has a vacuum chamber (18) and a working chamber (20), which are separated in a pressure-proof manner from one another by a movable wall (16). A control valve (22) having a housing (24), which is workingly coupled to the movable wall (16) and in which a first valve seat (64) is disposed, in order to achieve a pressure difference at the movable wall (16) controls the supply of at least atmospheric pressure to the working chamber (20) in dependence upon the displacement of an input element (26), which is coupled to the first valve seat (64), of the brake booster (10). Disposed in the control valve housing (24) is an armature (38), which cooperates with a permanent magnet (40) and which is rigidly coupled on the one hand to the input element (26) in actuating direction and on the other hand to the first valve seat (64).

Abstract: A pneumatic brake booster (10) has a booster housing (12), the interior of which is subdivided by at least one movable wall (14) into a vacuum chamber (16) and a working chamber (18). Along an axis (A) a control valve (20) for controlling a pneumatic pressure difference acting upon the movable wall (14) projects into the booster housing (12). The movable wall (14) is workingly connected to the outside of a substantially cylindrical control valve housing (22), in that a collar (34) of a plate (30) associated with the movable wall (14) is deformed along its periphery at least in sections radially into the control valve housing (22). In order to simplify manufacture of the brake booster (10), in the portion (36) of the control valve housing (22) overlapped by the collar (34) of the plate (30) a plurality of recesses (40) are provided, which are spaced apart from one another in peripheral direction and into which the collar (34) of the plate (30) is radially deformed.

Abstract: A vacuum brake booster (10) has a vacuum chamber (16) and a working chamber (18), which is separated in a pressure-tight manner from the latter by a moveable wall (14). In order to obtain a pressure difference at the moveable wall (14), a control valve (20) is provided, which valve comprises a housing (22) coupled in a working manner to the moveable wall (14) and a first valve seat (40), which is disposed in the housing and which, in co-operation with a first valve sealing member (42), can control the supply of atmospheric pressure or above atmospheric pressure to the working chamber (18) in accordance with the displacement of an input member (24), which is coupled to the first valve seat (40), of the brake booster (10).

Abstract: A master cylinder (10) for a hydraulic vehicle brake system has a housing (34) and a bore (36) which is disposed therein and in which a hollow cylindrical primary piston (38), which acts on a pressure chamber (40), is guided in a sealing and axially displaceable manner. An axially displaceable, hollow cylindrical auxiliary piston (42) is accommodated in the primary piston (38), into which piston (42) an actuating piston (46) projects, which piston (46) is adapted to be actuated by means of an input member (24), is is guided in a sealing and displaceable manner in the auxiliary piston (42) and is resiliently preloaded away from the latter at least during braking. The actuating piston (46) has a first hydraulically active diameter (D1) and the auxiliary piston (42) has a second hydraulically active diameter (D2). The auxiliary piston (42) is rigidly coupled to the actuating piston (46) after covering a determined distance against its resilient preload.

Abstract: A vacuum brake booster (10) has a vacuum chamber (18) and a working chamber (20) separated from one another in a pressure-proof manner by a movable wall (16). A control valve (22), which comprises a housing (24) workingly coupled to the movable wall (16), has a first valve seat (50), which is disposed in the housing (24) and to achieve a pressure difference at the movable wall (16) is capable of controlling the supply of at least atmospheric pressure to the working chamber (20) in dependence upon the displacement of an input element (26) coupled to the first valve seat (50). For improved boosting of the brake force during emergency braking operations, an armature (38), which cooperates with a permanent magnet (40), is provided in the control valve housing (24) and is rigidly coupled on the one hand to the actuating element (26) in actuating direction and on the other hand to the first valve seat (50).

Abstract: A vehicle brake system with an electronically controllable brake booster, comprising an actuation member (70, 80) transferring the actuation travel of a brake pedal to a master cylinder, which is allocated a travel limiting element (82) accepted between two abutment faces which limits the actuation travel of the actuation member (70), and a switching element (85) which upon an actuation movement of the actuation member (70) can be activated by one of the abutments (91, 91a) in order to issue a signal to the controller of the brake booster, with the travel limiting element being arranged on the actuation member (80) between two collars (83, 84), and a carrier (86) accepting the switching element (85) being arranged between the travel limiting element and one of the collars.

Abstract: A pneumatic brake booster (10) and a hydraulic master cylinder (60) are arranged in a series along a common axis (A) to form an assembly which includes a booster housing (12), a power input member (30) and a power output member (40). A mechanical power transmitter (32) is arranged between the power input member (30) and the power output member (40). A sleeve (50) is rigidly attached at a valve housing (22) to enclose a portion of the power output member (40). At the booster housing (12) a master cylinder housing (62) is attached which has a guide (68) facing the power transmitter (32). A primary piston (70) is guided in the master cylinder housing (62) and includes a support (72) for the power output member (40) as well as an extension (74) which extends towards the power transmitter (32) and is guided in the guide (68). The sleeve (50) extends to near this support (72) and is provided with a head portion (52) which bears against the master cylinder (60) via the guide (68) in a radial direction.

Abstract: A vehicle braking system with an electronically controllable brake servo unit which comprises a first pneumatic working chamber (13) and a second pneumatic working chamber (14) which are separated from each other by a movable wall (11), wherein a travel sensor (20) is provided for the detection of displacements of the movable wall (11) relative to a stationary wall (5b) of at least one of the two working chambers (13, 14) is improved to simplify assembly and adjustment of the travel sensor in such a manner that a wall (11) is provided with an opening (19) through which a measuring element (10) being connected with another wall (5b) is projecting, and that the travel sensor (20) converts a relative movement between the measuring element (10) and the travel sensor (20) in the direction of the movement of the movable wall (11) into a signal used for controlling the brake servo unit.

Abstract: For the purpose of routing an electric cable through the movable wall of the two pneumatic working chambers of an electronically controllable bake booster, comprising a first pneumatic working chamber and a second pneumatic working chamber which are separated by a movable wall, where a simple assembly and a high functional reliability are to be ensured, a cable feed-through for at least one electric cable penetrating the movable wall is provided, with a portion of the cable-feed through penetrating the movable wall, and a holder which limits the movability of the cable feed-through at least in its longitudinal direction, and a seal surrounding the cable feed-through in the area of the movable wall.

Abstract: A vehicle brake system with an electronically controllable brake booster, comprising an actuation member (70, 80) transferring the actuation travel of a brake pedal to a master cylinder, which is allocated a travel limiting element (82) accepted between two abutment faces which limits the actuation travel of the actuation member (70), and a switching element (85) which upon an actuation movement of the actuation member (70) can be activated by one of the abutments (91, 91a) in order to issue a signal to the controller of the brake booster, with the traveling limiting element being arranged on the actuation member (80) between two collars (83, 84), and a carrier (86) accepting the switching element (85) being arranged between the travel limiting element and one of the collars.