Abstract: The invention relates to a sealing collar for a cylinder-and-piston unit, wherein the sealing collar is essentially received in a groove that is inserted into the cylinder or the piston, respectively, and the sealing collar comprises two sealing lips, the first sealing lip thereof being acted upon dynamically and making catch at the piston or the cylinder, respectively, while the second sealing lip thereof is acted upon statically and rests on a bottom of the groove. It is the core of the invention that the sealing collar includes a circumferential extension that extends in parallel to the sealing lips, is arranged radially between the first sealing lip and the second sealing lip and projects from the sealing lips in an axial direction.

Abstract: An electrohydraulic brake system with driving dynamics control comprising a master cylinder that is operable by a brake pedal and includes at least one piston, which is displaceably arranged in a housing of the master cylinder and delimits a hydraulic pressure chamber together with the housing, the pressure chamber being connectable to an unpressurized pressure fluid reservoir by way of a pressure fluid reservoir connection and a pressure fluid channel and to wheel brakes to by way of an outlet, with a pressure fluid supply device supplying pressure fluid from the pressure fluid reservoir in the direction of the wheel brakes in the case of driving dynamics control.

Abstract: A device for the brake application of a motor vehicle comprising a master cylinder and a pneumatic brake booster, with one of the pistons of the master cylinder having a stepped design with two differently sized hydraulically active effective surfaces, and change-over of the effective surfaces takes place by means of a valve assembly upon failure of the brake booster. An annular chamber, delimited by the stepped piston and the housing, is connectable by means of the valve assembly either to the pressure chamber associated with the stepped piston or to a pressure fluid reservoir. The valve assembly comprises a first and a second valve, which are switchable depending on the pressure of the working chamber of the brake booster. The first valve in its activated position connects the pressure chamber to the annular chamber, and the second valve in its activated position closes the connection between the annular chamber and the pressure fluid reservoir.

Abstract: A master cylinder 1, especially for a controlled brake system, includes at least one piston 3, 4; 53, 54 displaceable in a housing 2, which is sealed in relation to a pressure chamber 7, 8 by means of a sealing element 5, 6 arranged in an annular groove 23, 24 of the housing 2, said pressure chamber being connectable to an unpressurized supply chamber 11, 12 by means of transverse bores 9, 10; 50, 51 provided in the piston 3, 4; 53, 54. Several recesses 15, 16, 17 are arranged on an inside surface 13, 14; 59, 60 of the piston 3, 4; 53, 54 into which the transverse bores 9, 10; 50, 51 open.

Abstract: An actuator unit for an electro-hydraulic brake system of the ‘brake-by-wire’ type, the first and second pistons thereof being preloaded by a resetting spring each in opposition to the actuating direction. The first pressure chamber of the tandem master cylinder is connected to a hydraulic chamber limited by a simulator element. On the other hand, the simulator element defines a simulator chamber that accommodates a simulator spring and is connected to a pressure fluid reservoir. A valve device is provided to open or close the hydraulic connection between simulator chamber and pressure fluid reservoir. To increase the reliability in operation of a hydraulic fallback mode, at least one channel portion through the pressure chamber, closed at the edge at least in areas, is provided for the purposeful removal of pressure fluid contaminants by means of a compulsory pressure fluid scavenging operation.

Abstract: A cylinder, in particular for motor vehicle hydraulic brake systems, i includes at least one plunger piston (3) displaceable in a housing (2), at least one circular sealing collar (5) provided in an annular groove (4) of the housing (2) and having a dynamically applied inside sealing lip (6) which abuts with a first sealing surface (8) on the plunger piston (3), and a statically applied outside sealing lip (7) which abuts with a second sealing surface (9) on a bottom (10 of the annular groove (4), as well as a collar back (17). The collar back (17) has an uneven design and includes at least one circumferential sealing surface (18; 24).

Abstract: The invention relates to a sealing collar for a cylinder-and-piston unit, wherein the sealing collar is essentially received in a groove that is inserted into the cylinder or the piston, respectively, and the sealing collar comprises two sealing lips, the first sealing lip thereof being acted upon dynamically and making catch at the piston or the cylinder, respectively, while the second sealing lip thereof is acted upon statically and rests on a bottom of the groove. It is the core of the invention that the sealing collar includes a circumferential extension that extends in parallel to the sealing lips, is arranged radially between the first sealing lip and the second sealing lip and projects from the sealing lips in an axial direction.

Abstract: An actuator unit for an electro-hydraulic brake system of the ‘brake-by-wire’ type, the first and second pistons thereof being preloaded by a resetting spring each in opposition to the actuating direction. The first pressure chamber of the tandem master cylinder is connected to a hydraulic chamber limited by a simulator element. On the other hand, the simulator element defines a simulator chamber that accommodates a simulator spring and is connected to a pressure fluid reservoir. A valve device is provided to open or close the hydraulic connection between simulator chamber and pressure fluid reservoir. To increase the reliability in operation of a hydraulic fallback mode, at least one channel portion through the pressure chamber, closed at the edge at least in areas, is provided for the purposeful removal of pressure fluid contaminants by means of a compulsory pressure fluid scavenging operation.

Abstract: The present invention relates to an actuator for an electro-hydraulic braking system of the ‘brake-by-wire’ type comprised of a hydraulic pressure generator or master brake cylinder and a travel simulator, with said master brake cylinder including at least one piston that is operable by an actuating pedal, and wherein a device for detecting a driver's deceleration wish is provided, said device cooperating with said piston and being at least partly arranged in a master brake cylinder housing. To optimize the assembly in terms of packaging, production costs, weight, and function, the present invention discloses that the device for detecting a driver's deceleration wish comprises an annular housing embracing the piston in a radial direction and accommodating signal receiving elements which cooperate with signal transmitting elements mounted on the piston surface.

Abstract: The present invention relates to an operating unit for an electrohydraulic braking system of the ‘brake-by-wire’ type, which is designed as a tandem master cylinder having a first and a second piston biased by each one resetting spring in opposition to the actuating direction. The first pressure chamber of the tandem master cylinder is connected to a hydraulic chamber defined by a simulator element. The simulator element also defines a simulator chamber accommodating a simulator spring and connected to a pressure fluid supply reservoir. A valve device is provided which closes or opens the hydraulic connection between the simulator chamber and the pressure fluid supply reservoir.

Abstract: The present invention relates to an actuation device for an electrohydraulic brake system of the ‘brake-by-wire’ type which is configured as a tandem master cylinder with a first and a second piston that are respectively biased by a resetting spring in opposition to the actuating direction. The resetting spring associated with the first piston is additionally used as a travel simulator spring which determines the pedal characteristics, and a valve device is provided which closes or opens a hydraulic connection between a pressure chamber accommodating the travel simulator spring and a pressure fluid supply reservoir.

Abstract: The present invention relates to a vehicle brake system with a pneumatic brake booster which includes an input member being actuated by a vehicle operator and an output member as well as a control housing that carries a movable wall and accommodates a reaction plate at least in part, wherein there is further provision of means for detecting the point of maximum boosting of the pneumatic brake booster that can be used for the actuation of another brake force boosting device. The core of the present invention lies in that a switching or sensor means is provided with senses the maximum boosting force on the basis of a maximum deformation of a reaction element that is indirectly arranged between an output element and a movable wall in that the maximum approach between the output member representative of the output force and the movable wall representative of the booster force is sensed. Further, appropriate means sense the hold time during which the mentioned signal is applied.

Abstract: The present invention relates to an actuator for an electro-hydraulic braking system of the ‘brake-by-wire’ type comprised of a hydraulic pressure generator or master brake cylinder and a travel simulator, with said master brake cylinder including at least one piston that is operable by an actuating pedal, and wherein a device for detecting a driver's deceleration wish is provided, said device cooperating with said piston and being at least partly arranged in a master brake cylinder housing.

Abstract: The present invention relates to an electrohydraulic brake system for motor vehicles which is controllable in a ‘brake-by-wire’ mode of operation by the vehicle operator as well as irrespective of the vehicle operator, is operated preferably in the brake-by-wire mode of operation, and can be operated in a fallback mode of operation in which only operation by the vehicle operator is possible.

Abstract: The present invention relates to an operating unit for an electrohydraulic braking system of the ‘brake-by-wire’ type, which is designed as a tandem master cylinder having a first and a second piston biased by each one resetting spring in opposition to the actuating direction. The first pressure chamber of the tandem master cylinder is connected to a hydraulic chamber defined by a simulator element. The simulator element also defines a simulator chamber accommodating a simulator spring and connected to a pressure fluid supply reservoir. A valve device is provided which closes or opens the hydraulic connection between the simulator chamber and the pressure fluid supply reservoir.

Abstract: The present invention relates to a vehicle brake system with a pneumatic brake booster (1) which includes an input member (7) being actuated by a vehicle operator and an output member (push rod) (14) as well as a control housing that carries a movable wall (2) and accommodates a reaction plate (6) at least in part, wherein there is further provision of means for detecting the point of maximum boosting of the pneumatic brake booster that can be used for the actuation of another brake force boosting device.

Abstract: The present invention relates to a brake force booster for automotive vehicles which includes a booster housing whose interior space is subdivided by a movable wall into a working chamber and a vacuum chamber, and a control housing which carries the movable wall and in which a control valve is arranged for controlling a pressure differential that acts upon the movable wall, the said control valve being operable by an operating rod by way of a valve piston and by an electromagnet. According to the present invention, the brake force booster is characterized in that the electromagnet is actuatable in dependence on the relative displacement between the valve piston and the control housing detected by a sensor. This arrangement makes possible a very simple control of a brake assist function because the signal of the sensor can be used both for the activation and the deactivation of the electromagnet.

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: A brake power booster for automotive vehicles includes a control valve that is operable by an electromagnet irrespective of an actuating rod displacing a valve piston, the electromagnet actuating a third sealing seat which permits ventilation of the working chamber. The valve member of the control valve has passages which allow a pneumatic pressure compensation. To eliminate a pneumatic force component which counteracts the force generated by the electromagnet, the passages are provided radially outside the area delimited by the electromagnetically operable sealing seat on the sealing surface of the valve member.

Abstract: A brake actuating device for a parking brake of automotive vehicles includes a hand brake lever which acts upon two wheel brakes by way of two brake cables. To assist the manual operation, an electric motor is additionally provided which generates at least part of the actuating force.