Abstract: A vehicle brake system which permits both anti-lock control and different controls of independent force braking operations. In an independent force braking operation, a starting brake pressure is built up in the return circuit in the wheel brakes by way of a precharging pressure generator and the pump and is modulated in the following control phase according to the control algorithms of the selected control. Interposed between the precharging pressure generator and the return pump is a change-over valve which has three switching positions, i.e., one closed, one open, and one throttled. The change-over valve adopts its open position in the filling phase and its throttled position in the control phase. It is so configured that the switching position is achieved as a function of the initial pressure in the inlet chamber but independently of the actuating force which actuates the valve.

Abstract: The present invention relates to a hydraulic automotive vehicle brake system with wheel slip control, in particular for driving dynamics control, including at least one pump and pressure modulation valves in the brake lines to control the wheel braking pressure, wherein the suction side of the pump is directly, or indirectly via the pressure modulation valves, connected hydraulically to a braking pressure generator. A diaphragm is interposed into the hydraulic connection between the braking pressure generator and the suction side of the pump and contributes to reducing the load on the sealing ring at the pump piston.

Abstract: The present invention relates to a piston pump for a hydraulic system including a cylindrical bore, a pump piston adapted to reciprocate in the cylindrical bore and bounding, as a movable wall, a working chamber, and an inlet valve which closes in the way of a non-return valve and has a closure member and a valve seat, the closure member being preloaded by a valve spring which is arranged in a spring housing that cooperates with the pump piston, on the one hand, and with a compression spring preloading the pump piston, on the other hand, wherein the spring housing is attached to the pump piston and the compression spring is attached to the spring housing, and at least one of the attachments is by way of a frictional and/or operative engagement.

Abstract: The present invention relates to a hydraulic brake system with slip control, including a braking pressure generator which is connected hydraulically to at least one wheel brake by way of a main pressure line, a return line connected to the wheel brake and in communication with a pressure fluid collecting device, an auxiliary-pressure pump having an auxiliary-pressure line which is connected to the braking pressure generator, and at least one pressure modulation valve acting in the main pressure line and in the return line to close or keep open the pressure fluid passage in the main pressure line and the return line. An orifice is arranged in the main pressure line between the pressure modulation valve and the wheel brake, and an unimpeded hydraulic passage between the main pressure line and the wheel brake is provided in a first switch position, and the orifice limits the pressure fluid passage in the main pressure line leading to the wheel brake in another switch position.

Abstract: The present invention relates to an electromagnetic valve which includes a retaining member (2) that is pressure-tightly connected to a valve sleeve (3), a magnetic armature (8) which is axially movable in the valve sleeve, a valve closure member (9) corresponding with a valve seat member (16) being mounted on the magnetic armature, and a magnetic core (12) fixed in the retaining member (2) to transmit the magnetic flux of an electric valve coil (10) from the magnetic armature (8) to the retaining member (2) and to a yoke ring (11) which abuts on the valve sleeve (3) and the retaining member (2). The valve seat member (16) is attached directly to the end surface of the magnetic core (12) which is remote from the magnetic armature (8).

Abstract: The present invention relates to a hydraulic brake system which operates by the feedback principle during brake slip control operations and includes a self-priming pump that aspirates pressure fluid from a pressure fluid reservoir for traction slip control operations. In order to improve the delivery rate of the pump, having a parallel arrangement of the two suction valves, a special construction of the pump-assembly is proposed, wherein the two suction valves are integrated in the pump housing. Advantageously, the suction valves are in axially opposed relationship, and the first suction valve is arranged on the movable piston, and the second suction valve is connected with a screw cap. Further, a pump for a slip-controlled hydraulic brake system according to the present invention is suggested having at least one suction valve with a valve seat, a closure member and a valve spring, the preload of the valve spring being variable in response to the position of a delivery piston.

Abstract: The present invention relates to a hydraulic automotive vehicle brake system with brake slip control and automatic brake management for traction control and driving dynamics control including a braking pressure generator which is hydraulically connectable with at least one wheel brake and a pressure fluid accumulator by way of pressure modulation valves, a pump which is connected with its suction side to the pressure fluid accumulator and with its pressure side to a pressure fluid conduit which extends from the braking pressure generator to the wheel brake and accommodates the pressure modulation valves. The pressure fluid accumulator is partially charged, to which end a pressure fluid connection between the pressure fluid accumulator and the suction side of the pump can be closed. Upon attainment of the maximum partial charge, excessive pressure fluid volume can be withdrawn from the pressure fluid accumulator, and the capacity of the pressure fluid accumulator is not exhausted.

Abstract: The present invention relates to a hydraulic brake system which operates by the feedback principle during brake slip control operations and includes a self-priming pump that aspirates pressure fluid from a pressure fluid reservoir for traction slip control operations. In order to improve the delivery rate of the pump, having a parallel arrangement of the two suction valves, a special construction of the pump assembly is proposed, wherein the two suction valves are integrated in the pump housing. Advantageously, the suction valves are in axially opposed relationship, and the first suction valve is arranged on the movable piston, and the second suction valve is connected with a screw cap. Further, a pump for a slip-controlled hydraulic brake system according to the present invention is suggested having at least one suction valve with a valve seat, a closure member and a valve spring, the preload of the valve spring being variable in response to the position of a delivery piston.

Abstract: A brake pressure regulator comprising a hydraulically actuable slide valve integrated in a receiving bore within the valve accommodating body. The slide valve, in response to the switching position of the electromagnetic valves, controls the pressure fluid volume between a pressure fluid source and a pressure fluid consumer. The pressure regulator includes pressure fluid channels terminating on both front faces of the slide valve which are hydraulically connected through an inlet valve to the pressure fluid consumer. Preferably the slide valve includes a circular groove provided with a control edge and interconnecting the pressure fluid source and the inlet valve through a feed-in channel. The invention employs the principle of preventing leakage flows from occurring by suitably arranging pressure fluid channels and sealing elements and by pointedly guiding the pressure fluid flow.

Abstract: A valve for high-pressure radial piston pumps suitable for controlled brake systems. Prior art pumps consist of at least 5 elements. The valve includes less components and thus is less expensive to manufacture and easier to assemble. The valve's simplicity derives from the use of cold extruded connections between the valve and the housing, so that separate rubber sealings are superfluous, and which provide for a strong and non-detachable connection. Favorable embodiments of the present invention integrate some of the known valve elements thus reducing the number of the necessary cold extruded connections.

Abstract: A brake pressure controller for a hydraulic vehicle brake system includes a master brake cylinder (1), a wheel brake cylinder (10, 11) connected thereto through a brake conduit (5), and a branch conduit (8, 9) which is provided in the brake conduit (5) between the master brake cylinder (1) and the wheel brake cylinder (10, 11). The brake system includes control valves (12, 14) and a pump (16) returning pressure fluid from a return conduit (15) into the brake conduit (5). At least one valve (6) is provided between the master brake cylinder (1) and the branch conduit (8, 9), which valve, in a first mode of operation, connects the outlet (17) of the pump (16) to the master brake cylinder (1) and, in a second mode of operation, discontinues the connection from the outlet (17) of the pump (16) to the master brake cylinder (1) and connects the inlet (24) of the pump (16) to the master brake cylinder (1) or a reservoir (4).

Abstract: Following a general trend, the present invention provides an anti-locking hydraulic brake system to which a brake force controller has been added. However, as opposed to the prior state of art, the brake force controller (21) according to the invention is blocked only once the pump (18) builds up pressure. This means that in any uncritical deceleration, the brake force controller (21) performs its pressure reducing function as soon as the switch-over pressure thereof is attained. This will involve the advantage over other brake force controls actuated only upon failure of the anti-locking function that jamming or seizing of operative elements of the controller is prevented from occurring and that, in addition, a slip control will be required less frequently.

Abstract: A noise-minimized pressure reducing valve valve closure member an axial guiding tappet which is formed at its end as a spherical segment, and the diameter of which is adapted to the diameter of an inner bore in the control piston. Along with another valve tappet and a generous dimensioning of the cross-sections of flow passages, axial and radial vibrations of the valve closure member are effectively reduced or attenuated.To increase the tightness of the pressure reducing valve, for example, the closure member may comprise two closure elements, one of them is made of rubber, while the other one is made of metal. The metal closure element ensures exact pressure control, while the rubber closure element ensures increased tightness.

Abstract: An electromagnetic valve that is easily manufactured and has a coaxially adjustable valve seat thereby allowing customized selection of valve components. A precise adjustment of the aial air gap is permitted on the hold-on magnet. An individual selection of a diaphragm member situated within a valve seat member is provided for with the diaphragm member being detachably connected to the valve seat member and with the diaphragm member having an outwardly flared open end.

Abstract: A pressure control valve with a valve-closing member which is axially movably guided within a valve housing and which is capable of adjusting a passage between a first pressure agent connection and at least one second pressure agent connection depending on its position being variable in respect of a valve seat, pressure agent transition ducts to be shut off or opened up directly one after the other by the valve-closing member being positioned between the first and the second pressure agent connections for the reduction of the noise of the valve, which said pressure agent transition ducts form a variable cross-sectional area of the valve opening.

Abstract: A brake pressure controller for a hydraulic vehicle brake system includes a master brake cylinder (1), a wheel brake cylinder (10, 11) connected thereto through a brake conduit (5), and a branch conduit (8, 9) which is provided in the brake conduit (5) between the master brake cylinder (1) and the wheel brake cylinder (10, 11). The brake system includes control valves (12, 14) and a pump ( 16) returning pressure fluid from a return conduit (15) into the brake conduit (5). At least one valve (6) is provided between the master brake cylinder (1) and the branch conduit (8, 9), which valve, in a first mode of operation, connects the outlet (17) of the pump (16) to the master brake cylinder (1) and, in a second mode of operation, discontinues the connection from the outlet (17) of the pump (16) to the master brake cylinder (1) and connects the inlet (24) of the pump (16 ) to the master brake cylinder (1) or a reservoir (4).

Abstract: A brake pressure control unit for use in an anti-lock brake control system and that includes the capability of providing traction slip control. An accumulator is connected through a switch valve to a pressure line on the discharge side of a pump. The switch valve is opened when a braking operation is initiated during a traction slip control action. The accumulator, which accommodates a corresponding volume of hydraulic fluid, is provided in order to ensure the hydraulic fluid supplied to the brake circuit during traction slip control cannot return to the reservoir and damage the master cylinder sleeve.

Abstract: A slip-controlled brake system for effectively attenuating switching noises at the inlet valves of slip control brake systems. This system is effective and simplifies current approaches. This is achieved in that for several wheel brakes the system uses one differential pressure limiter which is common to several wheel brakes which is mounted between an auxiliary pressure source and brake cylinder inlet valves. A reference pressure, which corresponds to one of the wheel brake pressures, is supplied to the differential pressure limiter by way of a pressure selector. The pressure selector can be designed such that it conveys either the highest or the lowest of the wheel brake pressures to the differential pressure limiter.

Abstract: A solenoid valve which has a valve-dome-enclosed armature which, in dependence on a current energized magnet coil arranged on the valve dome, performs a stroke motion, so that a valve tappet movable with the armature and partially surrounded by a magnet core acts on a valve seat in a valve housing. For the purpose of damping valve operating noises that possibly might form, at least one recess of defined length, width and depth is arranged on a circumferential surface of the valve tappet which is remote from the armature, with the recess partially extending in the longitudinal direction.

Abstract: A hydraulic change-over valve is adapted for a vehicle brake system with anti-lock control and traction slip control which operates according to the return delivery principle during an anti-lock control operation and the self-priming pump of which takes in pressure fluid through the master brake cylinder during a traction slip control operation. The change-over valve is arranged in the suction line between a pump and a master brake cylinder and shuts off the connection during each pedal-operated braking operation and opens it during each traction slip control operation. To avoid negative effects on the brake pedal feeling, restrictors are provided which prolong the closing time of the switch-over valve so that the fluid volume for switching is received gradually and continuously. The switching position is determined by a diaphragm, whose effective surface depends on its flexure to afford a non-stick-slip operation.