Abstract: A method is disclosed for monitoring a pressure fluid reservoir that is equipped with an elastically-shaped media-separating element and a terminal position seal in which fluid reservoir is connected in a pressure fluid loop having a pressure generator driven by a drive unit and having at least one measuring instrument, which detects a parameter representing the operating pressure in the pressure fluid loop. The parameter is delivered to an electronic control unit, where it is further processed into a trigger signal, among others for the drive unit of the pressure generator. After the operating pressure in the pressure fluid loop has dropped below a prestressing pressure the drive unit of the pressure generator is triggered by the control unit, and via a predeterminable time interval beginning with this triggering, the signal course of the measuring instrument is plotted by the control unit and compared with a suitably memorized set-point value course.

Abstract: A combination electric motor-pump unit which is installed on a body of a vehicle. The pump unit includes motor fastening screws with which the electric motor is fastened to the pump housing and which connect the pump unit to the vehicle body. This significantly reduces the number of required parts. The pump unit is provided for a brake system of a vehicle.

Abstract: A gear pump has a gear wheel with teeth on an outer circumference and a second gear ring with teeth on the inside surface. The gear ring is guided in a circular-cylindrical recess of a housing and together with the gear wheel, each rotates about their own axis which are offset from one another. The gear pump is equipped with an intake opening and a crescent-shaped pressure opening in a first side wall of the housing that defines the recess. A countersunk feature is also provided, embodied as a hollow cone, in a second wall of the housing opposite the pressure opening. The hollow cone, which is in fluid communication with the pressure opening, promotes the buildup of a fluid film between the gear ring and the housing, which improves the wear resistance of the gear pump.

Abstract: The brake system has at least one brake circuit (I), in which a high-pressure pump is disposed. A self-aspirating charge pump is also provided, which is connected at least indirectly to the intake side of the high-pressure pump by an intake line of a supply container for brake fluid and by a pressure line. In the event of an inadequate supply of brake fluid by the charge pump, the pumping of air into the brake circuit (I) is intended to be precluded. To that end, a siphon is disposed in the intake line of the charge pump. Air aspirated by the siphon suddenly prevents pumping by the charge pump. The brake system is intended for use in motor vehicles with slip control or for automatic brakes.

Abstract: A vehicle hydraulic brake system having brake pressure modulation valve assemblies, between a dual-circuit master cylinder and wheel brakes of vehicle wheels. The pump device is embodied as a low-pressure pump with the brake pressure modulation valve assemblies be assigned a first and second return pump and that in the automatic braking mode the first pressure chamber is made to communicate with a first return pump and the second pressure chamber is made to communicate with the second return pump, on the inlet side in both cases. The low-pressure pump, in the automatic braking mode, generates charge pressure for the return pumps that is substantially below a maximum brake pressure, and the return pumps generate the maximum projected brake pressure and serve, in the additionally possible anti-lock mode, to return pressure fluid from the wheel brakes to the master cylinder.

Abstract: A ball joint that cannot be disassembled intended for use in a brake booster. The ball joint comprises a first, substantially rod-like component, which has a ball head; a second component, which has an insertion opening, which narrows in funnel-like fashion in the area of its beginning and is provided with an annular groove spaced apart from the beginning, a radially elastic securing ring, which is insertable into the insertion opening and lockable into place in the annular groove, as well as a sleeve, which has an annular groove for receiving the securing ring during the insertion into the insertion opening until it locks into place in the detent provided by the annular groove of the outer component. The sleeve surrounds the ball head in an articulated and undetachable manner.

Abstract: To permit mechanical override of an electrical command system to control deflection of the swash plate or eccentricity of an axial or radial piston pump, for example upon failure of the electrical control system, a group of valves 5-8 are connected to an electrical control unit 23 and an additional control valve 4, 4' with a manual control lever 18', 30' is provided, the deflection of the swash plate 1 or eccenter ring 28 of the pump being sensed by a position transducer 22 moved by a linkage which includes the manual control lever. In normal operation, the manual control lever is maintained by spring pressure to deactivate the control valve but, under emergency conditions, the manual control lever will operate the first control valve 4, 4' to admit hydraulic control fluid to position the swash plate, or eccenter ring, respectively, the consequent movement of which is fed back through the linkage to the manual control lever.

Abstract: An arrangement for controlling the operation of a fluid-displacement machine, such as a hydraulic pump or motor, which is equipped with an adjuster that adjusts the machine toward higher and lower throughputs in dependence upon the pressure of a control fluid acting thereon, includes a control valve which communicates the adjuster either with a high-pressure zone or with a low-pressure zone of a control circuit in different ones of its terminal positions. In addition thereto, the arrangement includes a pressure-limiting valve interposed between the low-pressure and the high-pressure zones of the control circuit. Both the control and pressure limiting valves are acted upon by the control fluid, the pressure of which is controlled by a common regulating valve.