Abstract: A brake booster is easily fastened and free from play on the splash wall of an automotive vehicle. The guiding portion (10) of the booster housing (1) is provided with an annular groove (11) receiving a clamping ring (3) held on the splash wall (2) of the vehicle.

Abstract: A tandem master cylinder for hydraulic brake systems of automotive vehicles comprising a housing in whose bore a first and a second piston are sealingly and slidably disposed. The piston in the inactive position abut on stops in the housing under the action of a first and a second resetting spring and which, within the bore, confine a first and a second pressure chamber which are in communication with a first and a second unpressurized supply chamber via central valves that are open when in the inactive position. The first piston-resetting spring is anchored on the second piston, and its spring rate is greater than the spring rate of the second piston-resetting spring.

Abstract: A disc brake, especially for use with automotive vehicles is disclosed including brake housing staddling the rim of a brake disc, brake pads disposed on either side of the brake disc and a spring supported on the brake housing and on the brake pads to load the same with respect to one another. To attain an adequate preloading force and to insure the required stroke, it is provided that the spring includes two circumferentially extending U-shaped spring arms that are capable of being placed into abutment with a supporting face on the brake pad. Another section of the spring abuts on a supporting face formed on the brake housing. The spring arms form an obtuse angle relative to a central section of the spring.

Abstract: An electrohydraulic device is suggested for continuously monitoring the pressure in a hydraulic brake system for automotive vehicles, in particular for outputting electric control signals in dependence upon applied pressure signals, the said device being composed of a housing containing two coaxial bores, a receiver arranged in the housing and applicable by the inlet pressure, as well as a converter for converting the hydraulic pressure into an electric output signal.To devise a structurally simple, reliable device of cost-efficient manufacture, the instant invention provides that the receiver is formed of a membrane made of amorphous metal with changing permeability which coacts with a coil system used as a converter, the output signals of which can be supplied to an evaluating electronic system.

Abstract: An anti-locking control system is provided which is intended for use with a vehicle brake system comprising two actuating circuits disposed in diagonal relationship. While in state-of-the-art brake pressure control systems of the type under consideration, per wheel cylinder, one electromagnetic valve open in de-energized condition and one electromagnetic valve closed in de-energized condition are needed, it is suggested according to the present invention that the open when energized valve of the wheel cylinder of the front axle, in the control mode, performs the brake actuation functions of the matching cylinder, i.e. wheel cylinder, of the same actuation circuit on the rear axle.

Abstract: In an anti-lock automotive vehicle brake system comprising a vacuum brake power booster, a considerable reduction of manufacturing and assembling costs is obtained while the system's reliability in operation is simultaneously augmented by the incorporation into this brake system of a second movable wall arranged within the vacuum brake power booster to which a controllable pressure differential may be applied. The wall isolates two pneumatic working chambers and, in the case of slip control, is movable in a direction opposite to the actuating direction of the master brake cylinder by two compensating cylinders which are connected with the master brake cylinder pressure chambers. A hydraulic chamber which is normally in communication with an unpressurized pressure-fluid supply reservoir is sealed from the reservoir by a retention valve during slip control to hydraulically prevent brake petal induced pressure from being applied to the master cylinder.

Abstract: An arrangement for mounting a brake power booster to the mud guard of an automotive vehicle. The booster is actuated by means of a push rod. An adapter which partly surrounds the booster housing is arranged between the brake power booster and the mud guard. To eliminate the engine and suction noises of the brake power booster which have a disturbing effect in the passenger compartment of the automotive vehicle and to simultaneously seal the passenger compartment, the adapter presents a ventilation port and a seal is provided between the adapter and the mud guard which is simultaneously brought in abutment against the push rod as a radial seal.

Abstract: An electric motor driven radial piston pump for a motor vehicle brake system with slip control is disclosed wherein the radial piston pump includes two parallel working circuits drivable by the drive motor. The working pressure of the first working circuit is limited to a preset value. Above the preset value only the second working circuit is effective.

Abstract: A control system and method for a brake system with anti-locking and/or traction slip control and sequential brake pressure modulation. A modulator pressure pattern is formed in a circuit (33) by measuring and evaluating variables determining the pressure in the control chamber of chambers (21) of a brake pressure modulator (4). The modulator pressure pattern represents, by approximation, the course of pressure in the modulator (4). This modulator pressure pattern is considered in the brake pressure control, that is in determining the excitation periods of the multi-way valves (13-16, 22, 23, 25) determining the pressure in a modulator chamber (21) of the brake pressure modulator (4) and in the wheel brakes (9-12). The pressure pattern is formed by integration of the valve excitation periods of the pressure increase and pressure decrease characteristics of the modulator (4) under consideration or of the entire system.

Abstract: The invention relates to a hydraulic unit for a hydraulic control device, in particular to a braking pressure control device as used in anti-skid control systems. Such hydraulic units include standardized valve blocks with electromagnetically operable valves. The standardization of the valve blocks implies that the pressure medium connections of the valve blocks have predetermined positions. The invention employs a distributing plate which has a system of channels, in particular in the form of punchings, and which, in a freely selectable manner, connects the valve blocks' connections, the positions of which cannot be changed, with connections of the other components of the control device. The invention provides good preconditions for manufacturing a large number of variants of hydraulic connections, thereby allowing series production of various configurations of braking pressure control devices for anti-skid control systems which are less expensive.

Abstract: A brake system is provided so that the direction of delivery of a pump is reversible. This is advantageous in that, without any additional valves, the brake system can be used both for controlling a brake slip and for controlling a traction slip. The reversion of the direction of delivery of the pump can be achieved by changing the direction of rotation of the drive.

Abstract: A resettable booster is disclosed including a booster chamber in communication with a resetting chamber through a closable connection. For pressure relief of the master brake cylinder, valves are switched so that the booster piston is pressure-balanced and the master brake cylinder force shifts the booster piston back into the brake release position. The pressure fluid is supplied from the booster chamber into the resetting chamber. Advantageously, the volume intake of the booster is small, hence allowing the use of an extremely simple pressure source construction. The pressure source is a cylinder with an accumulator chamber that is confined by a piston, wherein the piston is moved by the difference in pressure between the atmosphere and the vacuum in the intake side internal-combustion engine of the vehicle.

Abstract: An inwardly straddling disc brake in particular for automotive vehicles is disclosed including a brake disc carried at its outer rim, a stationary brake support having two substantially radially extending arms which are interconnected by a connecting portion extending substantially in a circumferential direction and a brake housing which is axially slidably supported at the brake support member and actuable by means of an actuating means and which embraces the inner rim of the brake disc. Two radially extending legs and a substantially axially extending bridge portion connect the two legs. A first brake pad is disposed and supported on one side of the brake disc, in particular in the brake support member and to which pressure can be applied directly by the actuating means. A second brake pad is disposed and supported on the other side of the brake disc, in particular on the brake housing and which can be applied by the respective leg of the housing.

Abstract: A slip-controlled hydraulic brake system with improved operational reliability during the slip control phase of operation has a master cylinder having shortened overall axial length. The master cylinder includes a valve-opening mechanism of one central control valve supported on the bottom of the longitudinal bore of the master cylinder, and the valve-opening mechanism of another central control valve supported on the secondary piston wherein during a slip control action, in the presence of a predetermined travel of the pistons of the master cylinder, a force component is generated that increases the reliability of the opening of the central control valves.

Abstract: A lift-up sun roof, in particular for automotive vehicles, featuring a simple design and a low overall height is proposed, with a rigid cover (2) which in its closed position closes a roof opening in a roof area (1) and which is guided at lateral guide rails (5, 6) by means of siding elements (4) and is raisable with one end above the stationary roof area (1) or, at option, slidable below the said roof area (1) upon lowering of one end. In this configuration, the connection between said cover (2) and said sliding element (4) is envisaged to be effected through a lever (7, 15, 16) which is pivotable about the longitudinal axis of said guide rail (5, 6), the angle of pivoting being determined by a control ramp (9).

Abstract: A process and apparatus for monitoring and controlling an anti-locking automotive brake system comprising a tandem master cylinder and an auxiliary pressure source, from which, in the event of anti-lock regulation, pressure fluid is supplied to the working chambers of the master cylinder. Auxiliary pressure regulation is performed with the aid of central valves and the auxiliary pressure source is turned on and off in response to the advance of the primary piston, a maximum distance being preset between the primary and the secondary piston. Once this space is exceeded, the central valve disposed in the primary piston, opens resulting in another advance of the primary piston and a switch-on of the auxiliary pressure source. If the primary piston after the auxiliary pressure source having been turned on, is not restored within the predetermined time interval, an error signal will be generated.

Abstract: A valve arrangement is disclosed including a housing in which an electromagnetically actuatable preliminary control valve for controlling a differential pressure and a main valve which is actuatable by the differential pressure are arranged and whose closing element provides for a selective connection between an outlet connection and at least one inlet connection. The valve arrangement is adapted for use in automotive vehicles without additional pressure fluid sources, by providing for the main valve to be changed over by means of a movable wall experiencing a balanced pressure in the rest position and which is pressurizable by the differential pressure.

Abstract: An anti-skid-controlled hydraulic brake system is described where the pressure medium, bled off from the wheel brakes for the purpose of pressure control, is replaced from a storage reservoir. The pressure medium will be delivered by a pump to the wheel brakes, and also into the master brake cylinder. As a result, during brake slip control, the volume requirements of the wheel brakes partially are met from the master brake cylinder. Directly involved is a pedal pulsation. So as to attenuate the pulsation, a throttling unit is inserted into the line between the pump and the master brake cylinder. A simple embodiment includes an orifice inserted between the pump and master brake cylinder.

Abstract: A brake actuating device for automotive vehicles comprises a hydraulic brake force booster and a hydraulic tandem master cylinder to which pressure is applied by the brake force booster and which is in communication with the hydraulic wheel brake circuits. The hydraulic piston of the brake force booster applies pressure to the primary master piston of the said hydraulic tandem master cylinder. Pressure is applied to the hydraulic piston of the hydraulic brake force booster from a hydraulic pressure source through a normally closed opening valve which, through a function electronic unit receiving by way of a control input in the form of a guide quantity, an input signal representative of the pedal travel is alternately opened and closed. Accordingly the hydraulic brake pressure build-up is effected in accordance with a predetermined function stored in the function electronic unit between pedal travel and brake pressure with no lost motion of the brake pedal.

Abstract: A braking pressure control unit is disclosed, including a transmission lever acting on actuating tappets of a control valve, the lever is articulated through the intermediary of a first spring arrangement attached to a vehicle part which changes its position relative to the braking pressure control unit in a load-sensitive manner. Between the transmission lever and the control valve actuating tappets, a second spring arrangement is provided, which urges the transmission lever against a stop affixed to the housing. The transmission lever is adjusted to provide a clearance between the lever and the actuating tappets. When the setting of the load-sensitive transmission arrangement is clearance-free, incorrect adjustments of the control valve will not cause appreciable variations of the valve change-over pressure.