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 valve arrangement, particularly to a solenoid valve arrangement for slip-controlled automotive vehicle brake systems, with a first valve closure member, in particular a hydraulically actuatable non-return valve, and a second valve closure member, preferably electromagnetically controllable by means of an armature and a magnet coil and arranged in a valve accommodating bore of the valve housing accommodating the valve arrangement, with both valve closure members being operable independently of each other in terms of action and being jointly arranged in the valve accommodating bore of the further valve closure member. This ensures a compact and easy manufacture of the valve arrangement.

Abstract: An electrohydraulic pressure control device consisting of one or several electromagnetically operable hydraulic valves arranged in a block-shaped manner on a valve accommodating body. In order to provide both a compact and operationally optimized pressure control device which makes manufacture, checking and assembly as easy as possible and where different thermal expansions of the components are to be received possibly without any tensions, this invention provides that the coils (1), flexibly held frictionally and/or positively by an elastic or plastic holding device (4) arranged on the carrier element (2) of the cover (3), are flexibly alignable with respect to the valve accommodating body (5).

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 solenoid valve for hydraulic brake units with slip control is described which has a magnetic armature (2) surrounded by a valve dome (14), the magnetic armature (2) positioned by energization of a magnet coil (16), so that a valve needle (1) which is carried by the magnetic armature (2) is moved onto a valve seat (3). A hydraulic actuating force is generated by an arrangement causing the valve needle (1) to open even through the solenoid valve is energized causing the valve to act as a pressure relief or limiter valve.

Abstract: An anti-lock hydraulic brake system is disclosed with a flow control valve in the brake line. To prevent the flow control valve from performing its control function during a normal braking operation, a retaining piston works in conjunction with a spring such that the retaining spring bears against a piston of the flow control valve and retains the flow control valve piston in its initial position during normal braking operation. The retaining piston also serves as a valve closure member for a valve in the return line.

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 master brake cylinder for an anti-locking hydraulic brake system is provided, comprising a central valve provided in each piston. The central valve comprises a first valve and a second valve. The opening distance A of the first valve is smaller than the opening distance B of the second valve. The first valve is made of a metallic material while the closure member of the second valve is made of a soft-elastic material, such as a rubber ring 40. Being made of a hard material, the first valve can perform a pressure regulating function, involving, however, the risk that dirt particles contained in the pressure fluid, are forced into the valve ball and the valve seat, respectively, thereby preventing the valve from closing completely. In such an event, at least the closing function of the central valve is performed by the second valve. To a limited extent, the second valve also can take over a pressure control function.

Abstract: The present invention relates to a hydraulic assembly for motor vehicle brake systems with slip control which includes at least a valve arrangement (4), a pressure accumulator system (2, 3) and an auxiliary pressure pump. In order to provide a hydraulic assembly which is as operatively safe as possible and has the greatest possible compactness, a central housing (1) shaped as an assembly carrier is provided which accommodates at least the pump pistons of the auxiliary pressure pump with the drive motor as well as the accumulator pistons of the accumulator system and the valve arrangement.

Abstract: A brake pressure control apparatus having a brake pressure master unit, a brake connected to the brake pressure master unit through a pressure line, a pressure-controlled inlet valve which is positioned in the pressure line and through which the brake pressure master unit is connected, in a first switching position, through a restrictor orifice to the brake and which is furnished with a control piston which in one direction is subject to the pressure in the pressure line and in the opposite direction is subject to the action of a spring and of the pressure in a return line which contains an outlet valve which is controllable by a control device, which blocks the return line in its position of rest and which releases the return line in its switching position.

Abstract: A hydraulic brake system with anti-lock control and traction slip control having a multiple-circuit master cylinder, inlet valves and outlet valves, a pressure fluid supply reservoir, an auxiliary-pressure supply system, an electronic control unit, and pedal-travel sensors and/or switches. The outlet valves which connect the wheel brakes of the non-driven wheels with the pressure fluid supply reservoir are driven temporarily or pulsewise in the traction slip control mode in order to safeguard that even in the event of a so-called braking intervention during the traction slip control mode, the travel of the brake pedal can be recognized by the travel switches and travel sensors which permits detection of the transition from the traction slip control mode to the braking mode.

Abstract: This invention relates to a solenoid valve where a volume governor which governs the hydraulic flow is inserted coaxially to the valve closure member into the valve accommodating body of the valve. The volume governor is integrated by way of series connection between the first pressure medium connection, emanating from a pressure medium source, and the valve closure member. A reduction of the valve operating noises is ensured with a smallest-requirement-answering structural size, thus the control noises being prevented from propagating over the entire connected system.

Abstract: The invention is concerned with a slip-controlled brake system, adapted for use in automotive vehicles, provided with a master cylinder connected to wheel brakes through main pressure conduits. The brake system is made up of hydraulic auxiliary pressure pumps, wheel sensors and electronic circuits for determining the wheel rotation pattern and for generating electrical brake pressure control signals which control electromagnetically actuable pressure fluid inlet and outlet valves provided in the pressure fluid conduits for slip control purposes. At least one volume-displacing pressure pulsation snubber cooperating with the pressure column of the two main pressure conduits is being disposed between the wheel brakes and the appertaining inlet valves of two main pressure conduits.

Abstract: A brake system which can be employed both for brake slip control and for traction slip control, wherein the brake slip control is performed according to the return delivery principle, while an open-loop system is set up during traction slip control. In order to manage with the same pump (10) in both cases, a valve system composed of a first non-return valve (16) and a second non-return valve (17) is provided at the suction side of the pump. The opening pressure of the first non-return valve (16) is greater than that of the second non-return valve (17). Further, the initial pressure of a low-pressure accumulator (9) is in excess of the opening pressure of the first non-return valve (16). The first non-return valve (16) is operative during brake slip control, while the second non-return valve (17) is operative during traction slip control. Switch-over can be effected for instance by the master cylinder pressure via a control line (18).

Abstract: An electrohydraulic pressure control device consisting of one or several electromagnetically operable hydraulic valves arranged in a block-shaped manner on a valve accommodating body. In order to provide both a compact and operationally optimized pressure control device which makes manufacture, checking and assembly as easy as possible and where different thermal expansions of the components are to be received possibly without any tensions, this invention provides that the coils (1), flexibly held frictionally and/or positively by an elastic or plastic holding device (4) arranged on the carrier element (2) of the cover (3), are flexibly alignable with respect to the valve accommodating body (5).

Abstract: A brake pressure control apparatus for automotive vehicles with an anti-locking control system is presented. It is comprised of a master cylinder, of one or of a plurality of wheel cylinders for wheel brakes, of a pressure modulator for the modulation of the hydraulic pressure in the wheel cylinders of the wheel brakes during a brake pressure control modus, of at least one motor-driven pump for the generation of a hydraulic pressure, of an electronic controller. The outlet valve associated with a wheel cylinder is furnished with a closing element (5) which is connected to the closing element (6) of the inlet valve through a captivating apparatus which is configurated and positioned in such a manner that in its closing position the said closing element (5) of said outlet valve opens the said closing element (6) of said inlet valve and in its open position it closes said closing element of the inlet valve.

Abstract: An anti-lock hydraulic brake system is described wherein a throttle valve has a restrictive flow condition which becomes effective in the brake line in the event of brake slip control. Pumps for reapply pressure deliver fluid to the wheel brake via this restriction and regulating the pressure in the wheel brake is performed by control of an outlet valve. The throttle valve is operated hydraulically by various arrangements including the application of pump pressure, or by wheel brake pressure applied upon opening of the outlet valve at the start of an anti-lock control cycle.

Abstract: The present invention relates to a brake system with anti-lock control and traction slip control having a master cylinder to which braking pressure can be applied by a brake pedal, which is furnished with pressure fluid by a pressure fluid reservoir, and which is connected to at least one brake cylinder of a driven wheel via at least one brake line; a low-pressure accumulator and a return-delivery pump for the anti-lock operation, as well as a supply pressure generating source with a limited fuel delivery for traction slip control which is arranged in the pressure fluid reservoir. The supply pressure generating source can be used for the rapid preliminary fill-up of the brake cylinder when the pump starts to operate, as well as for generating a supply pressure on the suction side of the pump.

Abstract: A brake pressure control system for automotive vehicles with an anti-locking control system is disclosed, in which an outlet valve (10) associated with a wheel cylinder has a closing element (5) which is coupled to the closing element (6) of the inlet valve (11) through a coupling housing (14) so that the closing element (5) of said outlet valve opens the closing element (6) of the inlet valve (11) and in its open position it allows closing of the closing element of the inlet valve. A plurality of valve chambers and the action of a self regulating a control bushing (48) which also acts as the coupling, a flow limiting valving action to the wheel cylinder (2) is attained. In another embodiment, inlet and outlet solenoid valves are operated by a single common electrical line, the inlet valve held closed despite deenergization by inlet fluid pressure from the master cylinder or pump as long as the pressure therefrom is greater than the pressure in the wheel cylinder.

Abstract: A solenoid valve for hydraulic brake units with slip control is described which has a magnetic armature (2) surrounded by a valve dome (14), the magnetic armature (2) positioned by energization of a magnet coil (16) , so that a valve needle (1) which is carried by the magnetic armature (2) is moved onto a valve seat (3). A hydraulic actuating force is generated by an arrangement causing the valve needle (1) to open even through the solenoid valve is energized causing the valve to act as a pressure relief or limiter valve.