Abstract: A valve, is disclosed having a valve seat (2) receiving a valve tappet (1), the valve tappet (1) being axially movably guided in a valve housing (10), as well as comprising a flow in (3) controllable between the valve tappet (1) and the valve seat (2) and being in communication with the pressure-fluid channels (11) in the valve housing (10). In order to minimize the valve's operation noise, the present invention arranges to radially load the valve tappet (1) relative to the valve seat (2) under the action of a transverse force F, an asymmetric flow space prevailing in the flow path (3).

Abstract: A circuit configuration for an anti-lock brake system, including a master cylinder (1) with a travel switch (27, 27') and an electromotively (31, 31') driven hydraulic pump (32, 32'), disposes of a "pump control" (45) which switches on the drive motor (31, 31') of the hydraulic pump (32, 32') in dependence on the vehicle deceleration and on the pressure fluid requirement during an anti-lock controlled braking operation, or on corresponding criteria and test results.

Abstract: The present inventive relates to a master cylinder (1 ) with elastomeric central valves (20) which can be opened in opposition to a relatively high pressure in the pressure chambers (8 and 9) without damage. The sealing face (29) of the valve member (26) is in the form of a hollow cylinder protruding slightly from the broad head portion (24) of the valve pin (21). The valve member sealing face does not, as has been conventional practice, extend radially inwardly past the head portion (24) in the direction of the central bore (13) to avoid being drawn into the bore (13).

Abstract: There is suggested a circuit configuration for an electronically controlled anti-lock brake system, wherein upon the commencement of braking pressure control pressure fluid is pumped out of a supply reservoir (13) into the pressure chambers 7, 8) of the tandem master cylinder (1) which closes the inlet valves (14 to 17) of all wheels at the onset of the control action. It regulates the braking pressure on the imminently locking wheels by opening and closing the inlet valves and outlet valves (14 to 17 and 22 to 25) in a known fashion, while on the non-locking wheels it slowly adapts the braking pressure to the pressure prevailing in the tandem master cylinder (1) by way of pulsewise actuation at a predefinable pulse-pause ratio, that means opening and closing of the inlet valves (14 to 17).

Abstract: An anti-slip brake, traction slip control (TSC) brake system is described for normally isolating the master cylinder from the output of a pump activated during anti slip brake control. The brake line is furnished with a non-return valve prevents pump pressure from being communicated to the master cylinder except when a high-pressure accumulator is fully charged by the pump, causing the non-return valve to be opened. A self priming pump is utilized having a pump chamber initially defining a flow path from the master cylinder to the brake line. The wheel brakes communicate via an outlet valve and a return line with the pump chamber, while an interposed second suction valve is provided in the return line, having an opening pressure in excess of 1 bar. Brake shunt lines connect each of the wheel brakes with the master brake cylinder, via a TSC-valve, closed during traction slip control.

Abstract: A rear brake pressure proportioning control device is disclosed, with a regulating piston (7) and with a valve closing member (9) being supported within a slidable control piston (8), the movement of the control piston interrupted at a predetermined rate of vehicle deceleration. A restriction (32) between the inlet and inlet chamber within which the control piston is disposed prevents a high rate of brake pressure increase from causing too high a rear brake pressure. A multiple-stage restrictor (26) is positioned in the inlet in order to prevent a very high rate of pressure increase of the brake pressure resulting in too low a rear brake pressure.

Abstract: There is presented a method for assembling a tandem master cylinder and a vacuum brake power booster of a hydraulic brake system for automotive vehicles. Air is injected via the pressure connections (19, 36) of the pressure chambers (11, 18) associated with the pistons (2, 3). Simultaneously, the pistons (2, 3) are moved in the direction away from the brake pedal. The pressure increase in the pressure chamber (18) is measured during the movement of the pistons (2, 3) and thus during the movement of the central valve (14) accommodated in the floating piston (3). The air pressure in chamber (18) will rise as soon as the closing member (15) of the central valve (14) has moved to sit on the valve seat (16) and the central valve is closed thereby. A trigger point which determines a measured distance on the abscissa of the diagram is fixed in the curve of the diagram "Pressures as a function of the travel of the central valve", the said curve indicating the pressure increase.

Abstract: An anti-lock hydraulic brake system is described having a bypass line to a pump used to evacuate and pressurize the wheel brakes during antilock control. A pressure control valve in the bypass line regulates the pressure in the pressure line to the master cylinder pressure level. A low pressure accumulator absorbs recirculated fluid flow from the bypass line. A pressure operated valve opens only when a difference in pressure between the master cylinder pressure and the pump outlet pressure line pressure develops. The consequence is that a non-return valve a and pressure operated valve in combination bring about isolation of the master cylinder during antilock control to prevent brake pedal reaction to pump pressure developed during a braking pressure control operation. When the accumulator is fully charged, the bypass line is closed by means of a shut-off valve operated by an accumulator piston so that the pump delivers fluid via the pressure valve (18) back into the master cylinder (1).

Abstract: A disc brake for automotive vehicles in which the brake disc is straddled radially from the inside by a fist-shaped brake housing. The supporting and guide elements of the housing consist of a supporting bearing (34) and a movable bearing (7). The supporting bearing (34) connects the housing (8) with the holder (6). The housing 8 is swivelable about the supporting bearing (34). The housing (8) takes support on the movable bearing (7) which comprises a pin (3) rigidly coupled directly to the wheel suspension (38). By coupling the movable bearing (7) directly to the wheel suspension and supporting the lining in a tangential direction directly on the entering side, maximum utilization of the radial space, an increase of the effective radius, and a reduction of the thermal load of the brake are achieved.

Abstract: This is a circuit configuration provided for an anti-lock-controlled brake system and serving for processing sensor signals obtained by wheel sensors (5) and for generating braking pressure control signals. This circuit configuration contains two microcontrollers (1, 2) interconnected by data exchange lines (7). The handled signals are concurrently processed by the microcontrollers independently of one another and the exchanged signals are checked for consistency. A deviation of the exchanged signals which is due to malfunctions is signalized to a safety circuit (8) which, thereupon, interrupts the power supply to the solenoid valves (Ll . . . Ln). The monitoring signal (WD1, WD2) fed to the safety circuit (8) is a predetermined alternating signal in case of consistency of the exchanged signals and in case of proper operation of the circuit configuration.

Abstract: In order to reduce the number of component parts required for a master cylinder incorporated in a hydraulic brake system and steering brake system which is composed of two master cylinders interconnected through a compensating line, it is suggested by the present invention that the compensating line (60) be connected to a compensating chamber (22) adjacent to the pressure chamber (21), and that a valve assembly isolating the pressure chamber (21) from the compensating chamber (22) be formed by a sealing cup (7) arranged on an operating piston (3) that is actuatable by the master cylinder piston (2).

Abstract: A brake pressure control system with an anti-locking control is presented which is operated with hydraulic fluid including a master cylinder and a plurality of valves for the modulation of the hydraulic pressure in the wheel cylinders of the wheel brakes during a brake pressure control mode, and at least one motor-driven pump (48). An axially movable rotor (66) of the motor (14) is furnished with a thrust member (49) which shifts upon motor start up to actuate a control valve. The fluid connection between the master cylinder (37) and the wheel cylinder (43) is thereby interrupted almost instantaneously. Also, by actuating the valve, fluid flows through a flow limiting valve (59), delivered by the pump (48), into the wheel cylinder (43). A rapid pressure reduction is achieved in the wheel cylinder.

Abstract: A brake pressure control for use with an automotive anti-locking control system (ABS) and/or a traction slip control system (ARS) is provided. The control comprises a pressure modulator for varying the hydraulic pressure in the wheel cylinder (13) during the brake pressure control mode, with the pressure modulator exhibiting at least one inlet valve and at least one outlet valve (21) associated with the wheel cylinder (13), at least one motor-driven pump (6) for generating a hydraulic pressure, and an electronic controller. The inlet valve is pressure actuated and comprises a piston-cylinder assembly including a piston (7) forcing, upon application of the brake pressure, a filling volume (14) into the wheel cylinder (13), followed by a throttled rise in pressure caused by a throttling flow restriction (16) defined through the piston.

Abstract: In an anti-lock brake system, a differential pressure limiter (8) is connected in front of the inlet valve (6). This causes a defined pressure gradient to always prevail at the inlet valve (6), what appreciably reduces the noise emission of the valve during an anti-lock braking operation. Since the inlet valve (6) has a slight throttling effect in its opened position, it may occur that on brake operation with cold brake fluid a pressure gradient is generated at the inlet valve (6) which results in the differential pressure limiter closing. It is therefore suggested to arrange a bimetal spring (20) in parallel to the control spring (15) of the differential pressure limiter (8), which bimetal spring expands at low temperatures and cases a force in addition to the spring force of the control spring (15) to act on the control piston.

Abstract: The proposed brake system eliminates breather bores and central valves in the working pistons of the master brake cylinder and establishes short-term pressure fluid connections between the supply reservoir and the working chambers when the brake is not applied by controlling replenishment valves and outlet valves. Therefore, connection of the supply reservoir to the working chambers of the working cylinder is constituted solely via electromagnetically controllable connections.

Abstract: A setting method for minimizing the closure travel of a central valve in a master cylinder is proposed, wherein, after the assembly of all internal parts except the stop (10), the internal parts having a position which corresponds to the inoperative position, the distance (y) between that end of the axial extension (12) which is on the actuating side and a fixed point is measured and wherein then, in dependence upon the measured distance (y) a stop (10) is chosen such that the desired closure travel (x) between the closing body (13) and the valve seat (14) of the central valve is established. By means of said method the closure travel of the central valve (x) is exactly adjustable irrespective of the tolerances of other component parts or a preceding power booster.

Abstract: In a hydraulic brake system for automotive vehicles with an electronically controlled brake force distribution and with anti-lock control, the rear-wheel brakes are connected via inlet valves (5, 7) closed in their inactive position. Placed in parallel to these valves is an arrangement (13, 14; 13', 14') which is substantially composed of the series connection of a brake force regulator (17, 18, 17', 18') with a throttle (15, 16) or a multiple-way valve (21, 22) which is open in its inactive position.

Abstract: A brake pressure control apparatus for automotive vehicles with an anti-locking control system (ABS) and/or with a traction slip control system (TSS) is presented. In the inlet line to the wheel cylinder an inlet valve is provided which affords a change-over from an orifice function into a flow limiting valve function at a predetermined wheel cylinder pressure. Flow is initially through an orifice (6) in a control slide valve piston (20), held in its initial position by a prestressing spring (23) acting through an auxiliary piston in engagement with control slide valve piston (20). An increase in pressure in the wheel cylinder (13), also exerted in the wheel cylinder pressure chamber (9), to a predetermined level, causes the auxiliary piston (27) to disengage from the control slide valve piston (20), preventing the force of the prestressing spring (23) from acting on the control slide valve piston (20).

Abstract: A brake pressure control for use with automotive vehicles having an anti-locking control system (ABS) and/or a traction slip control system (ASR) is described. Provided in the wheel cylinder (16) is a pressure fluid circuit for pressure modulation, which contains, in addition to the wheel cylinder and the pressure fluid pump, an inlet valve disposed upstream of the wheel cylinder, an outlet valve disposed downstream of the wheel cylinder and a pressure fluid accumulator disposed between the outlet valve and the intake side of the pump, with the accumulator, during the anti-locking control mode (ABS-mode) acting as a pressure relief and, also, isolating the rest of the fluid circuit from the master cylinder and the pressure fluid accumulator. A closed circuit is attained in all phases of the anti-locking control mode and, during the phase of pressure decrease in the anti-locking mode, a very rapid pressure decrease in the wheel cylinder is achieved.

Abstract: An anti-locking brake system for automotive vehicles, comprising a tandem master cylinder (1), a device (3, 4) for modulating the pressure supplied to the wheel brakes, an anti-locking control device (2) including a pressure reducing valve (10) located in the rear-axle brake circuit (7). The pressure reducing valve can be activated only in the event of failure of the anti-locking device. To attain a particularly simple and compact design of the re-switchable brakes force distributor (10, 110), an electromagnetic drive (21, 25, 121, 125) is provided and includes an actuating element (20, 120) through which pressure is directly applicable to the valve closing member (16, 116) of the pressure reducing valve (14, 15, 16, 114, 115, 116). To ensure the pressure reducing function even in the event of a failure of the anti-locking device during a brake actuation, an additional arrangement (134, 135, 136) for the volume expansion is provided.