Abstract: The present invention discloses a hydraulic fluid accumulator comprising a housing (1) having an interior subdivided into three chambers (2, 3, 4), with the first chamber (2) being filled with a gas and separated from the second chamber (3) by a first media separation element (6), the second chamber being filled with a fluid and separated by a second media separation element (7) from the third chamber (4) that is also filled with a fluid and connected to a hydraulic port (5).

Abstract: The present invention relates to a piston pump, in particular for controllable brake systems such as ABS or ESP, wherein a working chamber (40) of the pump in front of a piston (3, 52) is delimited by a pressure valve, and a resetting spring (4, 51) with its one end is supported on a valve seat carrier (9, 54) of the pressure valve and with its other end resets said piston (3, 52) into its bottom dead center position. An object is to render the assembly of the mass-produced pumps as inexpensive and simple as possible. To achieve this object, the present invention discloses that the resetting spring (4, 51) be adapted to be attached directly or indirectly to the valve seat carrier (9, 54) in addition.

Abstract: The present invention relates to a space-saving and weight-saving motor-and-pump assembly which comprises a drive motor and a pump unit driven by the shaft of the said motor. In order to supply in parallel as many media as possible with an assembly of this type, the present invention suggests the additional integration of at least one second pump unit, driven by the motor shaft of the drive motor, into the motor-and-pump assembly.

Abstract: In a piston pump, in particular, for the pressure fluid conveyance in hydraulic, slip-controlled brake systems, comprising at least one piston, a suction valve and a pressure valve, it will be possible for the suction and pressure valves to be externally checked in that the suction valve and the pressure valve are formed on a structural unit adapted to be separately handled. Preferably, the structural unit comprises a sleeve-type section in which the piston is guided.

Abstract: The present invention relates to a pressure control device for hydraulic automotive vehicle brake systems with wheel slip control which is especially suited for an operation in the automatic brake intervention, with a first housing for accommodating pressure fluid channels into which valve elements such as pressure control valves and/or pump elements are inserted, with a second housing arranged on the first housing for the accommodation of electric and/or electronic structural elements connected to the pressure control valves, as well as with an electric motor for driving the pump elements. At least one heating element is provided in the first housing and is connected to the electric and/or electronic structural elements in the second housing, and the heating element is disposed in an area of the first housing which includes hydraulic channels for fluid supply to the pump elements which represent a hydraulic flow resistance.

Abstract: A hydraulic unit for brake systems includes a housing (4), which is provided with an accumulator-receiving bore (1) that is oriented parallel to the axis of the valve-receiving bores (2, 2′) of the two valve rows (X, Y) and the motor-receiving bore (3), wherein the accumulator-receiving bore (1) and the valve-receiving bores (2, 2′) of the first and second valve rows (X, Y) open next to one another into a first end face of the housing (4).

Abstract: A hydraulic brake system with anti-lock control comprises a main cylinder connected to a reservoir, wheel brakes connected to the main cylinder by way of brake lines, and a recirculating pump, a suction side of which is connected to the wheel brakes by way of a first suction line. By way of a second suction line, the pump is connected to a pressure source. To control the pressure medium supply from a precharging device or other pressure source to the suction side of the recirculating pump as a function of the pressure in the second suction line, a hydraulically actuated valve is used. The inlet of the valve is connected to the precharging device via the pressure source, the outlet of the valve is connected to the suction side of the recirculating pump. The output pressure of the valve acts in a valve closing direction such that the valve closes once a pressure on the suction side of the recirculating pump exceeds a certain value.

Abstract: The recirculating pumps of brake systems that are equipped with a precharging device or other pressure sources, the pressure of which at least temporarily reaches the suction side of the recirculating pump, are highly stressed and consequently subjected to premature wear by this pressure. Over time, this results in large leaks which may cause damage to the pump motors. Consequently, the invention proposes to control the pressure medium supply from the precharging device or other pressure source to the suction side of the recirculating pump as a function of the pressure in this connecting line.

Abstract: A pump, electromagnetically operable valves and at least one low-pressure accumulator are arranged in a valve block. The valve actuators are disposed in front of a base of the valve block opposite to an electric motor which drives the pump. The housing of the low-pressure accumulator is formed of an add-on piece which is deepdrawn from sheet metal in a bowl-type configuration. The edge of the add-on piece is attached in the mouth of a blind-end bore in the valve block. The add-on piece projects beyond the and has roughly the same height as the actuators of the valves. The actuators and the add-on pieces are covered by a housing cap on the valve block which protects them against environmental influences. The arrangement is extremely compact and permits achieving a relatively small and, thus, light-weight valve block.

Abstract: The present invention discloses an electric-motor-and-pump assembly including an electric motor, and the pump-sided end of the motor shaft (3) extends through a housing lid (10), is supported with at least one roller bearing (13) on a pump housing (2), and its purpose is to drive pump pistons (17, 18). The housing lid (10) includes a bore in the area of a shaft passage (9) which leaves open a gap (11) to the motor shaft (3). The gap (11) connects a pump-sided crank chamber (14) to an inside space (19) of the motor. The assembly includes a sealing element (20) which shuts off the gap (11).

Abstract: A hydraulic brake system includes a solenoid valve with a pressure-limiting function to such effect that a stroke movement of a valve tappet, which can be fulfilled in response to the electromagnetic control force, is variable by the action of a hydraulic control force. A first pressure fluid channel is connected to the hydraulic pressure generator and opens into the valve housing proximate the valve tappet, and a second pressure fluid channel opens into the valve housing remote from the valve seat and the valve tappet. The second pressure fluid channel is connected to a pump and at least one wheel brake and is connectable to the first pressure fluid channel depending on the position of the tappet. The hydraulic pressure of the braking pressure generator acts upon an actuating member which counteracts the closing movement of the valve tappet.

Abstract: In a pump with a pump housing which includes at least one working chamber and a valve bore connected to the working chamber and wherein an inlet valve and an outlet valve are arranged one behind the other, and with a displacement element that is adapted to reciprocate and, by its movement, varies the volume of the working chamber, the valve sea, the closing element and a valve spring of the inlet valve or the outlet valve which presses the closing element against the valve seat, are interconnected to provide a cartridge which can be installed into the valve bore so as to seal, and the cartridges of both valves are installed from the same side into the valve bore and are supported in the installation direction on the pump housing by a step in the valve bore.

Abstract: The present invention relates to a hydraulic assembly for a hydraulic controlling and/or regulating device, including a plurality of hydraulic, mechanical and/or electrically operable functional elements, such as accumulator elements, valve elements, pressure-generating and drive elements which are arranged on an accommodating member, a plurality of pressure fluid channels which interconnect the functional elements and are adapted to provide a hydraulically operable connection between at least one pressure fluid source and a pressure fluid consumer, and a connection to a controlling device for the actuation of the functional elements. A plurality of hollow chambers associated with the functional elements are connected to a joint ventilation system which permits ventilation and bleeding of the hollow chambers for pressure balance with the atmosphere exclusively by way of a point of ventilation which is connected to at least one pressure compensation channel of the ventilation system.

Abstract: Electronic control of the supply pressure of the pump is suggested with respect to a hydraulic brake system which is used for brake slip control, traction slip control and further driving stability control operations. Means of action include, for example, the control or reduction of the motor current of the pump, electromagnetic closure of the suction valve of the pump or a brief change-over of the separating valve in the brake line.

Abstract: The present invention discloses a combination of an electric motor and a pump with a compact design. It is important that the pump housing 9 is made of plastic material and slid into the housing periphery 2 of the electric motor so that it embraces the pump housing from the outside and thereby imparts stability to it.The pump bores 15, 16 extend radially outwardly and are closed by plugs 22, 23 which bear against the inside of the electric motor housing 2.Because the pump housing is made of plastic material, it can additionally be used as a brush support plate for the brushes 24, 25 of the electric motor.

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 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 motor-and-pump assembly includes armature shaft of the electric motor which is retained in the pump housing by way of a main bearing and an auxiliary bearing.The objective is to align the motor housing centrically to the axis of the armature and, in addition, to achieve a reliable attachment of the motor housing to the pump housing.Therefore, the housing of the electric motor has a bowl-shaped design, and the rim of the motor housing is inserted into a concentrically circumferential groove in a flange surface on the pump housing. The diameter of the inner wall of the groove corresponds to the inside diameter of the motor housing. Thus, the inside wall of the motor housing abuts on the inner rim of the groove. The motor housing is thereby aligned centrically.The motor housing can simply be fastened to the pump housing by a clamping ring which is also inserted into the groove.

Abstract: An assembly, consisting of a motor and a pump, the motor being arranged in a motor housing and the pump in a pump housing. Both housings can be coupled to each other. The motor housing is provided with a second main bearing. The pump housing is equipped with a pump bearing. During normal operation, the forces acting on the pump eccentric are essentially supported by the main bearing and the pump bearing. The bearing forces are introduced into the pump housing. If the motor housing is not fastened to the pump housing, the rotor shaft is supported by the main bearing and, if necessary, an accessory bearing. Thus the motor can be tested without being connected to the pump housing.

Abstract: The application describes an electric motor with a pressure compensation device. This device consists of a BTFE membrane that is arranged in a connecting channel between the interior of the electric motor and the external air.The membrane is arranged in the shield of the electric motor. Since the shield consists of plastic, the membrane can be sprayed on during the manufacture of the shield such that the membrane is inseparably connected to the shield. However, other fastening methods can be considered. One particularly suitable location for arranging the membrane is a circumferential collar that serves for centering the housing relative to the motor shaft. The connecting channel is realized in the form of a slot on the outer side of the collar. The application also describes additional methods for attaching the membrane.