Abstract: An automatic one-shot adjusting apparatus which is applicable both for mechanically and for hydraulically actuatable duo-servo drum, brakes and which includes two ratchets (6, 14) interacting through springs (11, 15) and is capable of adjusting only upon the release of the brake.

Abstract: A brake power booster for automotive vehicles has a booster housing sealingly subdivided by one or more axially movable walls into one or more vacuum chambers and one or more working chambers, wherein a push rod is protected against dropping out of its assembled position, by integral retention features formed in a bowl-shaped insert member that receives the reaction plate. The insert member is received in a recess of the control valve housing and is held therein by a resetting spring which reacts against radially outwardly extending tabs on the insert member. Indentations, sheared-in depressions or radially inwardly extending tabs serve as alternate forms of the retention features.

Abstract: A spot-type disc brake in which a brake carrier elastically mounts a brake frame on a pair of guide rods so as to allow limited axial tilting. The brake carrier has a pair of axial arms receiving the brake pads therebetween and each attached to a radial member facing an inner connecting member connecting brake frame arms, and the guide rods extending axially therebetween. The brake frame arms straddle the carrier arms, and a spring element acts to press a contact area on one connecting portion of the carrier arms into engagement with central area on an outer connecting member fixed between the brake frame arms. A space between a pair of radially extending limbs of the brake carrier receives the actuating device mounted on another connecting member extending between the brake frame arms. Guide pins fixed to the brake carrier extend through oblong openings in the brake pads.

Abstract: A process is described for positioning the brake pedal during the automatic control mode in an automotive antilocking brake system, in which the pressure in the master cylinder is sensed at a point located where the master cylinder piston sweeps past so that either high or low pressure is sensed depending on the brake pedal position. The pressure sensing is used to generate an electrical signal which is processed in the system controller to it turn generate a control signal transmitted to a pump motor to cause delivery of a volume of fluid to the master cylinder so as to position the brake pedal in the desired position.

Abstract: A valve block assembly for an anti-lock assembly for anti-lock system for automotive vehicles. The assembly comprises a valve-receiving member (1) and a cover 92). The cover is made of plastics into which conducting paths are injection-molded. The conducting paths are part of a stamping (13). When the cover (2) is mounted on the valve-receiving member (1), all contacts are established between the pins (18) of the coils of the solenoid valves (19), on the one hand, and the erected ends (15) of the stamping (13), on the other hand. The instant invention accomplishes considerable simplification of the assembly.

Abstract: A brake system is provided which includes a restoring unit by which a restoring force can be applied to the pedal. Since the pedal, at the same time, actuates a control valve 9 determining the booster force, during a restoring operation, the booster force also is reduced. The wall 40 accepting the restoring forces advantageously can be located in the booster housing 5 between the master cylinder 1 and the booster wall 6. Since the wall 40 covers relatively small distances only relative to the booster wall 6, the overall length of the booster housing 5 is not significantly increased.

Abstract: A seal arrangement is disclosed for an actuating device of a drum brake furnished with an actuating lever which projects through the brake carrier. This arrangement includes an oval pleated bellows (1) fastened by a clamping ring (14) having teeth (15) arranged on its external edge (30) pressed into the wall of a matching, generally elliptical recess. Preferably, the pleated bellows is of asymmetrical configuration and is in a largely unloaded condition in the actuating position of the actuating lever.

Abstract: To warn the driver of an automotive vehicle in the event of failure of a component of the actuating apparatus in a brake pressure control device with two control valves which are acted upon by an actuating varied by an actuating variable which is common for both control valves, a separate actuating apparatus is provided for each control valve. The differential pressure between the pressure fluid outlets is permanently monitored.

Abstract: An ALC-system of the closed type is provided, with a throttle (27) switched in response to the filling level of the intermediate reservoir (9) inserted into the intake conduit between the intermediate reservoir (9) and a pump (10). This ensures damping of the pressure pulsation of the pedal and further ensures operation of the brake system for traction slip control operation.

Abstract: An anti-locking, hydraulic brake system is described comprising a master cylinder (4), a pressure fluid collector, at least one wheel brake (5) which, through a master pressure conduit (7), is in communication with the master cylinder (4) and, through a return conduit (12), is in communication with an auxiliary pressure pump (8), an electromagnetically actuated outlet valve (13) in the return conduit (12), and a hydraulically controlled inlet valve (6) in the master pressure conduit (7). The pump is connected to the wheel brake by an auxiliary pressure conduit having a throttle restriction therein. A control conduit branching from the auxiliary pressure conduit upstream from the throttle restriction operates the inlet valve.

Abstract: A piston-type pressure accumulator for traction slip controlled brake systems, and a switching arrangement provided therewith. An accumulator piston (2) is hydraulically pressurized through a compression spring (1) and slidingly guided within a housing (4). At least one sealing element (27) is provided at the accumulator piston (2) which separates an accumulator chamber (21) from a spring chamber (24). The compression spring (1) is clamped between a first cap (3) directly contacting and surrounding the accumulator piston (2) and a second cap (5) straddling the housing (4) and the first cap (3), the first cap (3) performing a relative movement within the second cap (5) which is sensed by a control switch (7), charging of the accumulator chamber 21 is controlled by energization of a loading valve (8) and pump (9), in turn controlled by the control switch (7).

Abstract: A hydraulic power steering system for automotive vehicles wherein the hydraulic power assistance takes place only above a predetermined steering power. A power cylinder (6) is coupled to a mechanical steering assembly, a pump (19, 36), and a control valve (12). In order to achieve safety in operation and a simple arrangement of the power steering system, a slide of a component (2) of the mechanical steering assembly is slidable with respect to the vehicle body. The slide is effected by the steering power overcoming a prestressing power, serves for the mechanical actuation of the control valve (12).

Abstract: A process for producing non-corrosive double-wall tubing in which an unbrazed, unsealed continuous double-wall tube of a given circumference is formed from a metal sheet composed of a first non-ferritic metal having a first defined region of exposed non-ferritic metal and a second region of a second metal in overlying relationship thereto, said exposed region having a width essentially equal to the circumference of the finished tube.

Abstract: A controllable hydraulic vibration damper for automotive vehicles comprising a working cylinder which contains damping fluid and which is subdivided into two working chambers by a damping piston with a piston rod, the damper comprising at least one channel disposed outside of the working chambers, a valve assembly having at least one controllable valve, and a compensating chamber, which vibration damper is a simple structure and has an optimal control for the rebound and compression travel, and a first working chamber in permanent communication with the channel and the compensating chamber, while the second working chamber is connected with the channel and the compensating chamber by a valve assembly including an electronically and a series of one way acting valves.

Abstract: In an anti-lock brake control system having a vacuum brake power booster and a tandem master cylinder, in which the brake pedal is controlled to be positioned forwardly of the initial return position during the anti-lock control mode. This is achieved by variation of the rate of delivery of an auxiliary pump as by switching the pump motor on and off by a switch actuated by the diaphragm of the power booster to provide a signal of the pedal position at the start of an anti-lock control phase. Various switching arrangements described include a Bowden-cable pulled by the diaphragm, a mechanical or an optical switch actuated by the rolling lip of the diaphragm, or an approach switch detecting the approach of the diaphragm and cam-assembly. The core (53) of the Bowden cable (54) is connected with the diaphragm plate (52) of the vacuum brake power booster. The core (53) moves the trigger cam (64). The switch (18) is actuated by the movement of the trigger cam (64).

Abstract: A hydraulic unit for a hydraulic controlling or regulating device, in particular for a braking pressure regulating device in anti-lock control systems or traction slip control systems for automotive vehicles. The hydraulic unit comprises a valve-accommodating member (13) accommodating electromagnetically switchable valves. Hydraulic channels (23) are contained in the valve-accommodating member. Incorporated in the side wall of the valve-accommodating member (13) is a non-return valve which is composed of a resilient element (28) that is clamped into the side wall (33) of a depression of the outside wall of the valve-accommodating member (13). The resilient element (28) is made of spring steel and is furnished with sealing material (34).

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: A piston sealing arrangement for pressure-fluid-operated systems is disposed in an annular recess of a piston (5) or an associated housing (4) and is composed of a sealing ring element (1A, 1B) as well as an elastic element (2, 3) acting on one side in opposition to the direction of the pressure force (A). Herein the elastic element is dimensioned such that the sealing ring element (1) moves against its elastic element (2, 3) at a pressure smaller than the force against which the piston (6) is moving and by which it is kept on its stop, a pressure-fluid film being formed as a result which safeguards a uniform initial movement of the piston to a largest possible degree.

Abstract: This invention relates to a device for the generation of auxiliary pressure, and has control valves (2) arranged in a control housing (1) of a control unit. The control valves (2), depending on their position, actuate several control channels (4) leading into severan control pressure chambers (3) so that, depending on the position of the control valves (2), communication can be established between an energy source (5) and s spring-loaded servo piston (6) which, via an adjoining working cylinder (7) sealed by the servo piston (6), delivers a medium of low pressure level to an energy level of high pressure by means of a pressure piston (8), with the servo piston (6) having elastic means (11) which influences a change-over point of the control valves (2) and which, for the purpose of switching the control valves (2), can be clamped in position between a servo element (9) connected on the servo piston (6) and control rod (10) engaging the control unit.

Abstract: An actuating unit for anti-lock brake systems for automotive vehicles comprised of a vacuum brake power booster and a tandem master brake cylinder, wherein on failure of the primary pressure chamber a force is simulated which is opposed to the actuating force. For this purpose, a compression spring (28) is arranged in the booster housing (10) which is brought into force-transmitting engagement with the input member only after a predetermined distance of travel of the input member has occurred (3, 23).