Abstract: A brake pressure generator for a hydraulic brake system for motor vehicles, comprising a booster piston (26) displaceable by a hydraulic auxiliary pressure in the actuating direction, comprising a master cylinder (2) including a stepped piston (36) to which piston pressure can be applied by a booster piston (26). The piston (36) confines a work chamber (48) and a chamber (56) decreasing in size upon movement of the piston in the actuating direction, which chamber (56), by way of a non-return valve, is on communication with the work chamber (48) and from which a conduit leads to a non-pressurized container (168), with the conduit being provided with a control valve (86). To permit employment of the brake pressure generator in slip-controlled systems a slip control is provided comprising a valve (182), by way of which, during slip control, controlled hydraulic auxiliary pressure can be supplied to the chamber (56) decreasing in size upon movement of the piston (36) in the actuating direction.

Abstract: A hydraulic brake system comprises a pedal-actuated tandem generator cylinder (3), an auxiliary-pressure supply system with electromotively driven pump (8) and pressure fluid supply reservoir (31) and an auxiliary-pressure control valve (7, 67). The tandem generator cylinder (3) is provided with a bore (24) extending wherethrough is an actuating rod (25, 72) which acts upon a primary piston (4, 68) and whose end remote from the primary piston (4, 68) cooperates with an initial-pressure piston (16) or a vacuum brake power booster (84) slidably supported in the bore (24) and being in turn coupled with the brake pedal (19) by way of a piston rod (17, 86). An annular piston (26) is displaceably arranged in the bore (24) between the primary piston (4, 68) and the initial-pressure piston (16) or, respectively, the force-output member (74) of the booster (84).

Abstract: A hydraulic brake system (FIG. 2) composed of a master cylinder (30) coupled to the brake pedal (46), wherein there is provided a hydraulic booster (31) with a booster piston (91) and a booster chamber (35), and an auxiliary pressure proportional to the pedal force (F) develops in the booster chamber (35) during braking by way of a brake valve (6) actuated by the brake pedal (46). With the booster (31) intact, the auxiliary pressure prevailing in the booster chamber (35) acts by way of a pressure line (85, 87) on the two-stage piston (20) of a fast-fill cylinder (18), whose small stage (95) is immersed into a filling chamber (22) and, during the brake action, presses the pressure fluid available in the filling chamber (22) by way of pressure line (33) into the one brake line (37) connected to the working chamber (34) of the master cylinder (30).

Abstract: A brake system with slip control comprises a conventional braking pressure generator (1), for example a master cylinder (2) with a vacuum-type booster (3) connected before it. An auxiliary pressure control valve (23) is provided whose control inlet port (21) is connected with a pressure chamber (9) of the master cylinder. As the slip control action starts, a hydraulic pump (26) is put into operation which causes an auxiliary pressure proportional to the pedal force to be built up by means of the control valve (23). The auxiliary pressure causes hydraulically actuatable valve arrangements (27, 28, 45, 46) to be switched over and thus the auxiliary pressure supply system (23, 26) instead of the master cylinder (2) to be connected with the wheel brakes (31 to 34). Simultaneously, the brake circuits (I, II) of the master cylinder are cut off and thus a further displacement of the master cylinder pistons (6, 7) is prevented.

Abstract: A hydraulic brake system for automotive vehicles provided with a hydraulic power booster (1) and with a master cylinder (10) operable by the power booster (1). The booster piston (2) is designed as stepped piston with a pedal-close portion (5) of smaller diameter and with a pedal-remote portion (6) of larger diameter. Together with a housing (11), the annular surface (12) of the booster piston (2) at the piston step encloses an annular space (13) of variable volume. The annular space (13) communicates with an unpressurized supply reservoir (22), which communication may be locked, and wherein in a pedal-remote pocket bore (7) of the booster piston (2) a master cylinder piston (8) confining a working chamber (17) is guided in a sealed manner. An annular chamber (14) confined by the pedal-remote annular surface of the booster piston (2) is pressurizable by the pressure of an auxiliary pressure source.

Abstract: A hydraulic vehicle brake system with anti-locking, wherein a braking pressure generator (25) comprising a hydraulic power booster (26) and a master cylinder (27) connected downstream thereof is employed for the pressure supply of the brake circuits. Wheel brakes (37, 34) are connected to the pressurizable working chambers (31, 32) of the braking pressure generator (25) by way of first valves (33, 36), while the working chambers (31, 32) are connectible with an auxiliary pressure source (1) by way of second valves (46, 146). A third valve (60) is interposed between the auxiliary pressure source (1) and the second valves (46, 146), which can be switched to assume an open position in response to a pedal contact (6) and sufficient pressure of the auxiliary pressure source (1).

Abstract: A hydraulic power booster, for the actuation of a master cylinder in an automotive vehicle brake system, in which a booster piston and a brake valve are essentially arranged in parallel with the booster piston. In dependence on the actuation force applied to the brake system, a hydraulic pressure may be developed in a booster chamber which is essentially defined by a pedal-operable piston rod and by the booster piston. In order to supply at least the required absorption volume to the brake actuating devices without considerable reaction force at the brake pedal, the piston rod may be supported at the booster housing, against an actuating force. The booster piston is positively connected with the piston rod so as to enable a limited relative displacement between the booster piston and the piston rod.

Abstract: A device for monitoring the circumferential speed of a toothed disc (1) capable of being rotated, with a sensor (4) arranged at a defined distance (s) from the toothed rim (2) of the toothed disc (1) and with a sensor casing (7) supported at and securable to a stationay guide member. In order to avoid the need of any additional adjustment of the distance (s) in the event of remounting the sensor (4), a bushing (9) is provided as a guide member which is adapted to be fastened to a carrier element (14) by screw means and which projects into a bore (8) of the casing (7). To arrange a threaded bore (15) in the casing (7), the bore (15) is adapted to accommodate a screw (16) into contact with the bushing (9).

Abstract: A hydraulic motor vehicle servo brake comprises a pedal-actuated master cylinder (11) with at least one master piston (24). In addition, a brake valve (17) is provided for boosting of the brake force, which brake valve upon actuation by the brake pedal (16) feeds pressure medium supplied by a hydraulic pump (18) connected to a supply reservoir (27) in a controlled way to the master piston (24). Furthermore, a pressure accumulator (45) is provided which is maintained in loaded condition by the pump (18) and is of such capacity as to ensure that it supplies sufficient pressure during the running-up phase of the pump (18) after the motor (147) is started. A control valve (46) connected to the pressure side of the pump (18) comprises a closing member 47 which normally closes a passage to a return conduit (48) leading to the supply reservoir and is pressurized by the pressure of the pump (18) against the force of a closing member spring (49).

Abstract: A hydraulic brake system for automotive vehicles with a master brake cylinder (51) and with a hydraulic power booster (49) connected upstream of the master brake cylinder, in which a pressure medium pump (18) which may be driven by an electric motor (17) is used for providing an auxiliary hydraulic energy, the drive of which may be switched on by a pressure accumulator (1), on the one hand, and by a brake pedal contact (58), on the other hand, in the unbraked operation of the automotive vehicle the pressure accumulator (1) permanently being kept on a pressure level sufficient for an initial actuation of the brake and the charge of the pressure accumulator (1) being monitored by a pressure control valve (19).

Abstract: A brake pressure generator for an automotive hydraulic brake system, wherein a booster piston (13) which is displaceable by an auxiliary hydraulic pressure in the direction of actuation is adapted to mechanically strike an annular piston (18) and is displaceable in the actuating direction. Sealingly guided within the annular piston (18) is a master cylinder piston (25) confining at least one working chamber (23) separable from an unpressurized supply reservoir (32), by a valve (31) controllable in way-responsive manner. Annular piston (18) is of a stepped-piston configuration and is provided with a section (19) facing pedal actuation (6) and being of a smaller diameter. According to the invention it is suggested that the pedal-sided section (19) of annular piston (18) is of a smaller diameter than that of the booster piston (13) to confine an annular chamber (22) which via a check valve (33) adapted to be switched open toward working chamber (23), is in communication with working chamber (23).

Abstract: A hydraulic servo vehicle brake is provided with a pedal-actuated master cylinder (11) and a first brake circuit I is connected to the pressure chamber (76) subjected to the pressure exerted by the master piston (24). Between the brake pedal (16) and the master piston (24), a brake application valve (17) is arranged which, on actuation by the brake pedal (16), applies pressure medium supplied by a hydraulic pump (18) connected with a fluid reservoir (27) in a controlled manner to the master piston. A wheel slip-brake control unit is provided which, in the event of incipient slip of a vehicle wheel, automatically reduces the brake power at the relevant vehicle wheel to a value just enabling the wheel to rotate and which comprises a switching valve (21) which is also subjected to the controlled pressure and is normally closed and opens at incipient slip of the associated vehicle wheel in order to apply the controlled pressure to the pressure chamber on which the master piston acts.

Abstract: A brake system with slip control for vehicles with front-wheel drive or all-wheel drive comprises two hydraulically isolated pressure-medium circuits (2, 3), to which one front wheel and one rear wheel each (VL, HR; VR, HL) are connected. Through a pair of valves (17, 19; 18, 20) consisting of inlet valve and outlet valve, the braking pressure in the two hydraulic pressure-medium circuits is varied upon recognition of an imminent locked condition. The braking pressure in the front-wheel brake is maintained constant by one additional valve (21, 22) connected upstream of the front-wheel brakes (4, 6) in the event of decrease or in the event of further increase of the pressure in the rear-wheel brake (5, 7) that is connected to the same hydraulic pressure-medium circuit (2 or 3, respectively).

Abstract: A slip-controlled brake system for automotive vehicles with driven front and rear axles is equipped with a pedal-actuated braking pressure generator (1) comprising a power brake booster (2) connected to an auxiliary pressure source (4). The booster communicates directly with one or several wheel brakes (HR, HL) and which acts upon a master cylinder (3), to the working chambers (6, 7) of which the other wheel brakes (VR, VL) are connected. Electromagnetically actuatable multi-directional control valves (EV, AV, 16) contained in the pressure fluid conduits leading to the wheel brakes and in the pressure fluid return lines to a supply reservoir as well as in a pressure fluid conduit (14) leading from the power brake booster (2) to the master cylinder (3) serve on control action to reduce the braking pressure at the individual vehicle wheels and to deliver pressure into the master cylinder (3).

Abstract: The present invention relates to a hydraulic power booster, in particular for the actuation of a master cylinder in an automotive vehicle brake system, wherein there is a booster piston and a brake valve arranged essentially in parallel to the booster piston. In response to an actuating force applied to on a brake pedal, pressure fluid is adapted to be metered into a booster chamber of the hydraulic power booster, the booster chamber being confined by a pedal-operable rod and by the booster piston. In the presence of relatively small actuating forces at the brake pedal, the wheel brakes connected to the working chamber of the master cylinder are supplied with at least the absorption volume required. The booster piston has a projection at the end remote from the pedal extending into a blind-end bore of a master cylinder piston. A hydraulic connection between the blind-end bore and the booster chamber is adapted to be closed by a pedal-operable valve assembly.

Abstract: A hydraulic servo vehicle brake with a tandem master cylinder wherein the first master piston (24) is provided with a cylindrical axial bore toward the piston pressure chamber (76). A second master piston (80) extending to the master cylinder bottom (79) is tightly slidably arranged in the axial bore. A non-return valve (23) provided as a sealing cup is provided between the second master piston (80) and the annular portion (24"') of the first master piston (24). Between that portion of the second master piston (80) which projects from the axial bore (78) and the master cylinder (11), an annular chamber (22) is provided which is linked with a three-position two-way valve (33) controlled by the controlled pressure. With no application of controlled pressure, the three-position two-way valve (33) links the annular chamber (22) to the fluid reservoir (27). In the presence of a slight controlled pressure, the valve (33) interrupts the link.

Abstract: A brake system with brake slip control and traction slip control provided for road vehicles comprises a braking pressure generator (1) comprising a single-type or tandem-type master cylinder (2, 9, 9'), a power brake booster (10, 10', 10") connected upstream in the pedal line and a positioning device (11) between the master cylinder and the power brake booster. Multiple-way valves (4, 5, 5', 5", 5"', 34-36, 49-51, 66-68) are provided which, in the event of brake slip control, cause dynamic fluid delivery out of a dynamic circuit, (e.g., a power brake booster (7, 10, 10', 10")) and which, for traction slip control, will interrupt the connection to the dynamic circuit and bring about direct communication with the auxiliary energy source (8, 8').

Abstract: A brake system comprises a tandem master cylinder (24) with working pistons (19, 27), each of which confining a working chamber (25, 29). Upstream of the tandem master cylinder (24) a power booster (1) is connected which is connected to an auxiliary energy source (8) for the pressure supply. Connected to the booster chamber (3) are valves (22, 23) which are controllable by the pressure of the booster chamber (3) and by which a pressure medium communication may be established from the auxiliary energy source (8) to the working chambers (25, 29) of the tandem master cylinder (24) and a dynamic inflow of pressure medium takes place.

Abstract: A slip-controlled brake system for automotive vehicles comprising a braking pressure generator (3) with a power brake booster (2) supplied by an auxiliary pressure source (7), with the booster communicating with the wheel brakes of one axle by way of multi-directional control valves (EV) and acting upon a master cylinder (3) which communicates with the wheel brakes of the other axle. For traction slip control, the working chamber (11) of the master cylinder (3) is connectable to the auxiliary pressure source (7) by way of multi-directional control valves (9, 13).

Abstract: A slip-controlled brake system for automotive vehicles with a driven axle and a non-driven one has a braking pressure generator (10) connected to an auxiliary pressure source (9), to the braking pressure generator (10) the wheel brakes of a front wheel (VR, VL) and of a rear wheel (HR, HL) are connected by way of two separate pressure medium circuits. The braking pressure in the two circuits (I, II) at first is jointly controlled by means of an inlet valve and an outlet valve each (5, 13 and 7, 14 respectively). However, a far-reaching decoupling of the pressure variation in the two wheel brakes connected to one circuit (I or II, respectively) is achieved by means of additional 2/2-way valves (6, 15) in the pressure medium line towards the wheel brakes of the non-driven wheels (HR, HL).