Abstract: In order to reduce the number of component parts required for the simultaneous ventilation of two power chambers of a tandem brake power booster and to avoid sealing problems. A booster, according to the invention, provides for the transmission of the boosting power of the master cylinder-side movable wall of the booster to be directly to the control housing.

Abstract: An internal shoe brake, which is being used as a parking brake in a disc hub, is designed so that it can be preassembled in a ready-to-be-installed fashion. For that purpose, the anchor plate, serving as a cover plate, is mounted to a support by at least two fixing members. The fixing members are provided with heads which mesh free from play with bores provided in the axle support. Fixing of the support and the anchor plate to the axle support is effected through the intermediary of a screw. The screw and the fixing members jointly transmit the circumferential forces onto the axle support.

Abstract: A position encoder for a sliding door power drive system, such as those employed on van type vehicles, enables a positive drive powered operation of the door by a control switch remote from the door while accommodating manual operation of the door without mechanical interference or resistance from the drive or altering of the drive control program. A push/pull cable connected to the door is in positive meshed engagement at all times with a rotary drive gear whose rotative displacement from a rest position is continuously read by the position encoder and transmitted to a control unit as a door position input signal. During powered operation of the door, the control unit controls a bidirectional drive motor which is coupled to the drive gear via a normally disengaged clutch to drive the door to selected positions along its path of movement.

Abstract: A circuit configuration for automotive vehicles with traction slip control, by which traction slip control signals are derived from sensor signals of the driven and the non-driven wheels. Circuits for detecting roadway obstructions and for suppressing control actions in consequence of these roadway obstructions, disable the traction slip control or reduce the sensitivity of the traction slip control or reduce the sensitivity of the traction slip control for a predetermined period of time (T) upon the occurrence of positive slip on a non-driven wheel and/or in the event of acceleration of a non-driven wheel. When a control in which a vehicle reference speed (V.sub.Ref) is formed, the vehicle reference speed is increased for a predetermined period of time for the purpose of suppressing undesirable control actions.

Abstract: A process for the precise adjustment of the lost travel of a piston in a master cylinder. Master cylinders typically include a number of components in spatial series arrangement, with all components having individual tolerances. The individual tolerances regarding the lost travel of the piston or pistons, can combine additively in the master cylinder. The resulting lost travel, hence, is relatively large and varies with individual master cylinders. The process provides that the lost travel of the piston or pistons in the master cylinder can be precisely adjusted and, hence, can be kept very low. The position of the piston or pistons is measured in the condition in which they just seal the associated equilibrium ports. Subsequently, the position of the pistons is calculated in consideration of the desired lost travels and, by adjustment of the force planes acting on the desired point, the resting position of the piston and pistons, respectively, is fixed to the desired distance.

Abstract: A valve block for a slip-controlled hydraulic brake system, comprising valve domes (10) incorporating magnet coils (7), having insulating casings (6) cast around the magnet coils (7). A conducting-path housing (1) containing several conducting paths (2) are provided wherein the magnet coils (7) are electrically connected to the conducting paths (2) by means of spring contacts (9). To avoid soldering of coil and conducting paths as well as the catch-type securement of the housing cover, an elastic spring contact is fastened between magnet coil and coil jacket which, instead of a soldered joint, provides the electrical connection to the conducting path. The arrangement obviates the need for the complicated mounting of a separate housing cover, since due to the construction and jointing method component parts of the valve block are encapsulated by the external housings.

Abstract: A boot (19) protecting the pedal-sided end (18) of the control valve housing (5) of a vacuum brake force booster is fixed by a spacer. The spacer is preferably configured as a dual-walled annular sleeve (20). It is axially secured in the same position as a ring sealing the control valve housing (5) against the booster housing (1). An axial extension (26) of sleeve (20) insures that the boot (19) is kept remote from the booster housing (1) and from the control valve housing (5), respectively, so that air can be taken in between boot (19) and control valve housing (5) for ventilating the working chamber (3). This design allows the air required for ventilation to travel very closely to the baffle wall, thereby minimizing noise in the passenger cabin of the automobile.

Abstract: A device for the generation of auxiliary pressure for slip-controlled brake systems with a pedal-force-operated brake booster connected to a tandem master cylinder (19). A pressure is transmittable in the brake booster housing (7) of the brake booster to the wheel brakes connected downstream. This pressure is controlled by an electromagnetically operated control valve (5) in that the pressure as a hydraulic pressure is influenced by the pneumatic actuation of a servo piston (2). The servo piston (2) is fastened on an auxiliary pressure control piston (1) within the brake booster housing (7) and the influence is a function of thermodynamic state variables of different energy sources (11). Thus, a device is provided for the generation of auxiliary pressure which, while using simple constructional configuration, provides an operationally reliable and economical use of available thermodynamic state variables such as the atmospheric pressure and of the gas throttling of an internal combustion engine.

Abstract: As an improvement on conventional brake systems of the type having a multiple-chamber vacuum brake force booster, a modification is disclosed to the effect that, in the brake releasing position, there is a pressure medium communication between a booster chamber and a simulator chamber. A modulator chamber requires only one external connection, thereby substantially simplifying the construction of the brake force booster and readily permitting an extension of the system's use to include traction slip control.

Abstract: A piston pump, having at least one delivery plunger to deliver pressure fluid from a suction chamber via a working chamber into a pressure port, is provided with elastic damping elements arranged in the suction chamber to compensate for the occurring pressure pulsations.

Abstract: To control the pressure at the outlet of a pump and to position the pedal during a brake slip control action, an additional arrangement is provided to an existing master brake cylinder which arrangement comprises a transmission piston (5) as well as a shut-off valve (30). The closure member of the shut-off valve is loaded by way of a valve piston (28) and by the pressure in the brake line (18') in opposition to the pressure at the outlet of the pump. The valve closure member is thus pressure-balanced so that no forces are transmitted onto the tappet (37). Therefore, the ramp (40) at the transition piston (5) need not be separately hardened during the manufacturing process.

Abstract: A circuit configuration for a brake system including an anti-locking control system, wherein a balanced pressure course is attained in the rear wheel brakes through control according to the "select-low" principle. The circuit configuration is furnished with a supplemental circuit (8) comparing the rotating pattern of the rear wheels during the control and, upon detection of a brake moment difference (.DELTA.M) causes a brake moment correction. This correction can be achieved, for example, by prolongating (T.sub.p, T'.sub.p) of the pressure build-up pulses controlling the rise in pressure in the wheel exhibiting a lower brake moment.

Abstract: An acceleration sensor essentially consists of a cantilevered laterally bending beam arranged in a housing. Because of its mass inertia the bending beam is deflectable relative to the sensor housing in the plane of the acceleration to be measured. The bending beam has the design of a thin resilient strip which is wide relative to its thickness and is made of amorphous metal. The bending beam may have a one-layer or a multi-layer structure. In case of a multi-layer structure, the friction between the individual strips, causes the vibration to be damped. A small air gap between the walls of a closed housing and the bending beam additionally brings about an air damping of the bending beam's vibrations.

Abstract: To substantially eliminate the noise arising upon actuation of a vacuum brake force booster caused by incoming air, the housing section confining the ventable working chamber and/or the intervals in the control valve housing are lined with an insulating composition for attenuating noise.

Abstract: A spare wiper element for a wiper blade and a method for the assembly of the spare wiper element. The spring bars are held in lateral grooves of a wiper rubber basic body and are secured by holding clamps lapping over the basic body of the wiper rubber during the assembly with the supporting yoke system.

Abstract: A drive mechanism for windshield wiper systems on motor vehicles comprises a d.c. motor to be driven in at least two different speeds of operation. The motor includes a collector, a first and a second carbon brush substantially resting against the collector diametrically opposite each other, and a third carbon brush which rests against the collector between the first and the second carbon brush. The third carbon brush is set off at a particular angle relative to the second carbon brush. When the d.c. motor is operated in the first speed of operation the first and the second carbon brush is connected to the voltage source and when the d.c. motor is operated in the second speed of operation the first and the third carbon brush is connected to a voltage source.

Abstract: A pressure control device for brake systems of automotive vehicles. The device includes a stepped control piston (5) which is guided axially displaceably within a housing (1, 2) and which, cooperating with a valve element (14), controls the pressure medium passage between an inlet chamber (8) and an outlet chamber (9). The smaller diameter portion (6) of the control piston (5) is associated with the inlet chamber (8) containing the valve element (14). In order to optimally adapt the control characteristic to the specific requirements of the vehicles it is provided that the valve element (14) is applied by a displaceable stop (17).

Abstract: A method is suggested for assembling a tandem master cylinder and a vacuum brake booster of a hydraulic brake system for automotive vehicles. Air is injected via the pressure connection (19) of the pressure chamber (18) associated with the push-rod piston (2). Simultaneously, the push-rod piston (2) is moved in the direction pointing away from the brake pedal. The pressure increase in pressure chamber (18) is measured during the movement of the push-rod piston and, thus, during the movement of the central valve (6) accommodated in the push-rod piston. As soon as the closure member (5) of the central valve is seated on the valve seat (4), thus the central valve being closed, the air pressure will increase in the chamber (18). In the curve of the "pressure-against-central-valve-travel" diagram, which curve indicates the pressure increase, a trigger point is established which determines a measured distance on the abscissa of the diagram.

Abstract: A metal cup accommodating a reaction disc and the end of a push rod is fixed with respect to a control valve housing of a vacuum brake power booster. The manner of fixation is of simple design, allowing the parts to be manufactured at low cost and offering ease of mounting. According to the invention a metal cup is supported in axial direction at the front side of the control valve housing and is retained by a retaining clip in a positive locking fit with the control valve housing.

Abstract: A braking pressure regulating device, in particular an anti-lock control device for hydraulic brake systems of automotive vehicles, comprising a master cylinder and a pressure modulator for the variation of the hydraulic pressure in the wheel cylinders during the braking pressure control mode. The device is equipped with a motor-driven pump (8) for generating a hydraulic pressure and with an electronic control unit (5) for controlling the valves of the pressure modulator (2). During the braking pressure control mode, the working chambers (10, 15) of the master cylinder (16) are exposed to pump pressure. Caused by the pump pressure in the working chamber (10), the push rod piston (11) and thus the brake pedal (1) disadvantageously are returned into their basic position in prior-art devices. The present arrangement provides that the switching positions of the regulating valve incorporated in the push rod piston are shifted into the cylinder during the braking pressure control mode.