Abstract: The present invention relates to a tandem master cylinder (20) including two plunger pistons (2, 4) and its object is to design the cylinder as simple as possible and to render its assembly as economical as possible. This object is achieved by inserting circumferential annular grooves (16 to 19) directly into the housing (15) of the master cylinder (20) in order to accommodate sealing sleeves, namely both the primary seal (6) and, in an improvement of the invention, the primary seal (7) of the piston at the end of the push rod as well as the secondary seals (12, 14) of both pistons (1, 3). Collecting annular grooves (45, 46) at the level of the connecting outlets for the compensating reservoir (5, 10) are further favorable aspects of the invention.

Abstract: The present invention relates to a compensation reservoir (6) with a cover (1) for a hydraulic brake system. An object of the present invention is directed to simplifying the prior art cover (1) that typically comprises several parts in such a manner that it can be made from one piece, without reducing the demands being placed on the cover. According to the present invention, this object is achieved in that a cylinder opening (11) extending in a radial direction is shaped into the material of the cover, said opening providing an air duct (11) that starts from the center axle of the reservoir (16) and extends to the radial, external inner space of the cover (1).

Abstract: The present invention relates to a brake force booster for automotive vehicles which includes a booster housing whose interior space is subdivided by a movable wall into a working chamber and a vacuum chamber, and a control housing which carries the movable wall and in which a control valve is arranged for controlling a pressure differential that acts upon the movable wall, the said control valve being operable by an operating rod by way of a valve piston and by an electromagnet. According to the present invention, the brake force booster is characterized in that the electromagnet is actuatable in dependence on the relative displacement between the valve piston and the control housing detected by a sensor. This arrangement makes possible a very simple control of a brake assist function because the signal of the sensor can be used both for the activation and the deactivation of the electromagnet.

Abstract: The present invention relates to a device for brake pressure control in hydraulic brake systems of vehicles, wherein at least one measuring data emitter for the relative movement between the actuating device and the abutment or for the pedal force introduced into the simulator spring, one measuring data emitter for the position of a brake piston, and one measuring data emitter for the pressure in the brake circuit or between the control valve and the housing, wherein the hydraulic pressure fluid which flows from the pressure supply device by way of the control valve is exclusively fed into a chamber of the housing where it urges the abutment to bear against the stop, on the one hand, and applies pressure to at least one brake piston.

Abstract: The present invention relates to a brake force booster with a panic braking function for automotive vehicles. The present invention includes that the first sealing seat arranged movably in relation to the control housing wherein the sealing seat is fixed to a lever such that when a predetermined relative displacement between valve piston and control housing is exceeded so that the lever prevents at least a movement of the sealing seat in the actuating direction. The brake force booster with a brake assist function is easy to manufacture and, in addition, ensures a controllability of the brake force in the emergency braking position.

Abstract: The present invention relates to a brake-power transmission device, especially for motor vehicles, including an actuated input member, an output member to exert a boosting force, especially on a main brake cylinder, and a control valve arranged in a control housing to regulate the boosting force. An axially movable pressure piece is provided in the area of a reaction member. The pressure piece is supported on the input member or the control housing, thereby permitting changes to be made in the power transmission ratio. There is a general need to provide a brake-power transmission device that enables increased boosting only when required and that allows for mechanical sensing of the brake actuation speed so that immediate maximum boost force can be exerted when required without any time delay.

Abstract: The brake force booster 1 with panic brake function includes a control valve, which is arranged in a control housing and operable by way of an input member, for controlling the boosting pressure in a working chamber, the said control valve including an atmosphere sealing seat on a valve piston and a vacuum sealing seat which is arranged on a sliding sleeve that is axially slidably mounted in the control housing. In the event of a panic braking, a quick depression of the brake pedal causes advance movement of the valve piston connected to the input member in relation to the control housing and the sliding sleeve, whereby opening of the atmosphere sealing seat is initiated and a clutch device is actuated which leads to supporting the sliding sleeve in the brake actuation direction on the elastically deformable reaction member, to which latter both the mechanically generated brake force and the pneumatic boosting force is applied. The clutch device is released by withdrawal of the input member.

Abstract: The present invention relates to an arrangement for actuating an automotive vehicle brake system of the type ‘brake-by-wire’, which comprises an actuating pedal and a travel simulator which cooperates with the brake pedal and whose simulator piston is in a force-transmitting connection with the actuating pedal and is preloaded by a spring, and which includes means of attenuating the movement of the simulator piston as a function of the actuating pedal travel. To achieve an effective attenuation, according to the present invention, the simulator piston (11) delimits a hydraulic chamber (12) which is connected to a second hydraulic chamber (4 or 14, respectively) by way of at least one variable flow resistance (16,17,18,19,20).

Abstract: A braking pressure boosting device is suggested, in particular for automotive vehicles, which includes a boost sensor for sensing or identifying the point of maximum boosting of the braking pressure boosting device. By using the boost sensor, ad signal is generated reporting the point of maximum boosting. This invention permits the manufacture of high-performance braking force boosting devices requiring minimal space and opens up new potential for economizing.

Abstract: An electronically controllable brake actuation system for automotive vehicles includes a simulator interacting with the master brake cylinder, a pressure source drivable by an electronic control unit and by which wheel brakes of the vehicle are pressurizable, the wheel brakes being connectable to the master brake cylinder by at least one hydraulic connection that is closable by separating valves, a device for the identification of the driver's wish for deceleration, each one inlet and outlet valve connected upstream of the wheel brakes, and wheel sensors sensing the rotational behavior of the vehicle wheels. To improve the meterability of braking pressure of a system of the above type, especially in the range of low pressure values, the pressure source is configured as at least one continuously adjustable piston-and-cylinder assembly having a pressure chamber which is connectable to the master brake cylinder and the wheel brakes.

Abstract: The present invention relates to a combined service and parking brake system, especially for automotive vehicles, which includes a hydraulically clampable combined service and parking brake with a mechanical locking device. The mechanical locking device is electrically operable and thus satisfies in a simple fashion the parking function of the hydraulically clamped combined service and parking brake.

Abstract: A multi-way pressure control valve for an electromagnetically actuatable multi-way control valve for slip-controlled hydraulic automotive vehicle brake systems, for providing a flow connection between at least one wheel brake and a high-pressure source or a low-pressure accumulator.

Abstract: The present invention discloses a magnetic valve for liquid and gaseous working media, in particular for hydraulic brake systems in automotive vehicles, which includes a first cylindrical housing part that is encompassed on its outside by a magnetic coil and has a cylindrical recess inside which extends in an axial direction to accommodate and guide an axmature, a tappet which is displaceable by the armature in an axial direction in opposition to a resetting spring, a second cylindrical housing part which is arranged coaxially to the first housing part and includes a cylindrical recess extending in an axial direction, the said recess being in connection to outside valve ports and in which a valve seat cooperating with the tappet is arranged.

Abstract: The present invention relates to a hydraulic brake system for automotive vehicles operable by independent force which includes a master brake cylinder preceded by a hydraulic brake force booster that has a booster piston and a working chamber to which an auxiliary pressure source is connectable, wherein a valve device operable by way of an electromagnetic drive is provided which establishes a hydraulic connection between the working chamber and an unpressurized pressure fluid supply reservoir in a first switching position and a connection between the working chamber and the auxiliary pressure source in a second switching position. To ensure low-noise operation of the brake system and a sensitively controlled volume delivery of the pressure fluid, the valve device is provided with a slide valve (20) of analog operation.

Abstract: The present invention relates to an electronically controlled brake force distributor for automotive vehicles, which includes a pedal-operated braking pressure generator (1) to which wheel brakes (HL, VR, HR, HL) are connected by way of pressure fluid lines. At least one valve (10) is inserted into the pressure fluid lines and positioned in the pressure fluid conduit to the rear-wheel brakes. An actuator (5) is provided to actuate the valve (10) and, as a function of the vehicle deceleration, switches the valve (10) from a first into a second position in which the valve (10) is switched from its open initial position to a position separating the rear-wheel brake (HR; HL) hydraulically from the braking pressure generator (1). In this separating position, the rear-wheel brake (HR; HL) is hydraulically connected exclusively to an accumulator chamber (6) associated with the actuator (5).

Abstract: This invention relates to a multidirectional valve, in particular for wheel-slip-controlled and/or automatic-brake-intervention-equipped hydraulic brake systems of automotive vehicles, which includes a seat valve member disposed axially movably within a valve housing as well as a valve slide movable relative to the seat valve member within the valve housing, with the valve slide connecting one or a plurality of pressure medium consumers (wheel brakes) alternatively to a pressure medium source (braking pressure generator) or to a pressure medium collector (low pressure reservoir) The valve slide is mechanically coupled with the seat valve member.

Abstract: A hydraulic brake system with electronic anti-lock control contains, as essential components, a pedal actuated brake pressure transducer (1), electrically actuated inlet and outlet valves (EV1 to EV4, AV1 to AV4), wheel sensors (S1 to S4) and an electronic control circuit (6). The brake pressure transducer (1) is equipped with one or more path sensors (5), for the direct or indirect determination of the pedal path (S). Interdependent with the current driving conditions, the brake situation and the pedal path (S), the anti-lock control is switched from a standard control mode into a safety control mode, which essentially permits only a brake pressure increase in the front wheels and a brake pressure decrease in the rear wheels during an anti-lock control procedure. A limit value (SpGrenz) of the pedal advancement is determined interdependent with the driving conditions and the brake situation, and upon exceeding such a switch over takes place into the safety control mode.

Abstract: An electronically controllable brake actuation system for motor vehicles is proposed, with a master cylinder actuated by means of an actuating pedal, said cylinder with brake pressure transducers driven by an electronic control unit, to which wheel brakes of the motor vehicle are directly connected and which are connectable with the master cylinder by means of hydraulic linkages that can be locked by valve devices, with at least one sensor device to recognize the drivers desired deceleration and also with at least one simulator chamber cooperating with the master cylinder. In order to improve the function of a system of this kind, in particular for ASR control processes, it is proposed through this invention that the valve devices be designed as electromagnetic valves driven by the electronic control unit and that the pressure-volume characteristic of the simulator chamber is independent of that of the wheel brakes.

Abstract: The setpoint generator according to the invention utilizes the information "pedal travel s" in combination with the information "pedal force p" by weighting them in input circuits 4,5 and summing up the corresponding partial setpoints p'.sub.s and p'.sub.p to form a setpoint p'.sub.Hz. Here, a countercurrent weighting takes place: If a small force acts on the pedal, the pedal travel is dominant; as the pedal force is growing, the latter is weighted more heavily. In this way, a smooth brake behavior is attained, whereby the comfort is enhanced and the wear of the employed components is reduced.

Abstract: A method of operation of an electronically controllable brake actuation system for anti-lock automotive vehicle brake systems employs a brake system which includes a master brake cylinder operable by an actuating pedal, braking pressure generators which are electromechanically operable by an electronic control unit. The braking pressure generators are directly connected to wheel brakes of a vehicle and are connectable to the master brake cylinder by way of hydraulic connections closable by valves that are electromagnetically operable by the electronic control unit. The system also includes at least one sensor device for identification of the driver wish for deceleration, and at least one simulator chamber interacting with the master brake cylinder. On commencement of a braking operation, a signal representative of the position of the master brake cylinder piston and a signal representative of the actuating speed occurring on the actuating pedal are produced.