Abstract: An electrically controlled valve, in particular for the variable adjustment of the damper characteristic curve of a vibration damper, comprising a magnetic drive for actuating a valve slide that is guided in a housing in one moving direction, as well as a passage arranged in the housing between a valve inlet and a valve outlet for the variable volume flow control, the passage cooperating with a control edge of the valve slide. The moving direction of the valve slide is electrically reversible, thereby resulting in a comparatively simple mechanical layout for the valve for variably controlling the characteristic curve of the valve.

Abstract: An electrohydraulic aggregate for converting electric energy into mechanical energy, comprising an electric motor with a stator and with a rotor, comprising magnets or electric windings that produce electromagnetic fields, at least one connecting component for connecting the windings to at least one energy supply, with the connecting component extending through at least one through-hole, the through-hole is provided in an accommodating member accommodating electrohydraulic valves as well as at least one piston pump for the energy supply of a slip-controlled brake system, the piston pump being connected to the electric motor by a gear, and a rotor mounting support comprising at least two spaced rotor bearings, of which at least one so-called A-bearing supports a shaft in the accommodating member, and a so-called B-bearing that is supported in a pot-shaped motor housing.

Abstract: A controllable valve includes an axial working air gap arranged on a side of the magnet armature that cooperates with a valve closure member, the side facing away from the valve closure member, so that upon electric actuation of the actuating drive, the valve closure member is movable by the actuating drive in the direction of the first valve seat surface.

Abstract: Disclosed is an electrohydraulic brake system for motor vehicles, which has a brake pressure sensor or main brake cylinder, a pressurizing medium reservoir, an electrohydraulic pressure source, separation valves, which are inserted in the connection between the main brake cylinder and the wheel brakes, inlet valves, which are connected before the wheel brakes, and outlet valves which are connected after the wheel brakes, as well as a valve block, which receives the pump, the separation valves as well as the inlet valves and the outlet valves, where the pressure source, the wheel brakes as well as the brake pressure sensor can be connected with the pressurizing medium reservoir. To produce a compact electrohydraulic equipment assembly, the brake pressure sensor (2) is integrated in such a manner in the valve block (16) that all the hydraulic connections between the brake pressure sensor (2) and the separation valves (27-30) as well as the inlet valves (47-50) are formed by bores in the valve block (16).

Abstract: The present invention relates to a tandem master cylinder including two plunger pistons and its object is to design the cylinder as simple as possible and to render its assembly as economical as possible. This object is achieved by inserting circumferential annular grooves directly into the housing of the master cylinder in order to accommodate sealing sleeves, namely both the primary seal and, in an improvement of the invention, the primary seal of the piston at the end of the push rod as well as the secondary seals of both pistons. Collecting annular grooves at the level of the connecting outlets for the compensating reservoir are further favorable aspects of the invention.

Abstract: The invention relates to a master cylinder with a pressure chamber formed in a housing of the master cylinder and a reservoir bore for accommodating a pressure fluid reservoir, a valve with a closing element being provided which due to a pressure difference prevailing between the pressure chamber and the pressure fluid reservoir can be moved into an opening position or a closing position, the valve in its opening position allowing a pressure fluid flow from the pressure fluid reservoir into the pressure chamber and throttling or preventing, in its closing position, a pressure fluid flow from the pressure chamber into the pressure fluid reservoir. Means are provided which maintain the closing body in its opening position when it is acted upon by a closing pressure difference during vacuum filling of the brake system.

Abstract: Disclosed is a method for operating a vehicle brake system having a vacuum brake booster for generating an auxiliary force. An approach to a point where the auxiliary-force to actuating-force ratio falls below a predetermined ratio is detected, and a nominal pressure is generated before the above ratio falls below the predetermined ratio.

Abstract: Vacuum brake booster for motor vehicles comprising a booster housing whose interior is subdivided by a movable wall into a vacuum chamber and a working chamber, a control valve that controls a pressure difference acting upon the movable wall and is accommodated in a control housing that carries the movable wall, said control valve being composed of two concentrically arranged sealing seats and an elastically deformable valve member, wherein the control housing includes a cavity through which a cross member extends and delimits the axial movability of a valve piston relative to the control housing, and the cross member includes at least one projection made of an elastic material in the area where the cross member rests against the booster housing. At least one projection made of an elastic material is provided in the area of points of abutment between the control housing and the cross member.

Abstract: The invention relates to a master cylinder, in particular for a hydraulic brake system, with at least one pressure chamber formed in a housing of the master cylinder and at least one reservoir bore for accommodating a pressure fluid reservoir, a valve with a closing element being provided which due to a pressure difference prevailing between the pressure chamber and the pressure fluid reservoir can be moved into an opening position or a closing position, the valve in its opening position allowing a pressure fluid flow from the pressure fluid reservoir into the pressure chamber and throttling or preventing, in its closing position, a pressure fluid flow in the opposite direction to the pressure fluid flow from the pressure chamber into the pressure fluid reservoir.

Abstract: A hydraulic brake system for vehicles with a brake pressure generator unit which is operable by introducing an actuating force by way of an actuating device that includes a first hydraulic chamber having a volume which decreases when the brake pressure generator unit is actuated, out of which pressure fluid volume is displaced due to the volume decrease and to which wheel brakes are connected by way of a first hydraulic connection, wherein a pump is arranged which is capable of delivering the pressure fluid volume displaced out of the first hydraulic chamber due to the volume decrease into the wheel brakes. The first hydraulic chamber includes an elastic device by which a force/travel characteristic curve is determined in the actuating device when an actuating force is introduced.

Abstract: The present invention relates to an actuation device for a motor vehicle, including a pedal stand that can be mounted on the vehicle and has articulated to it a base member that is swivelling about a first axis and fixable by means of an adjustment device, comprising a housing for a hydraulic or electromechanic generator that points into a vehicle interior in opposition to a direction of actuation, and a pedal lever which is pivoted at the base member and includes two legs, wherein foot pressure is applicable to the first leg, and the second leg acts on the generator. The device permits a simple adjustment of the actuation device to adapt to the comfort requirements of different drivers with different body lengths (leg lengths) and further has an optimized collision performance. Finally, it is favorable that hydraulic generators may also be arranged in the interior of the vehicle.

Abstract: A compensation reservoir is provided that includes a connecting socket and a cover having a bottom and a circumferential collar for attachment to the connecting socket, preferably by thread means. The attachment is configured for air interchange between the air of the ambient atmosphere and an inner space of the reservoir which inner space is limited by the bottom. Air interchange is provided by an integrated duct that interconnects a radical outward section of the inner space and an opening within the cover, wherein lateral walls of the duct are casted in one piece from the material of the cover.

Abstract: The present invention relates to a position indicator for displaying the position of a piston within a cylinder as part of a piston-and-cylinder assembly in a brake system. The provision of a Hall element for a hydraulic generating cylinder is known in the art, with the Hall sensor mounted on the cylinder and a ring magnet mounted on the piston. An object of the invention is to describe a position indicator for a brake system, which has a simple construction and is able to provide signals relating to the position of the brake pedal relatively rapidly. This object is achieved because a Hall element of a Hall sensor is placed in the cylinder wall of the master cylinder, and because a magnetic zone is arranged in the piston-and-cylinder assembly so that the Hall element responds to the piston movement within the cylinder.

Abstract: The present invention relates to a brake force transmission device for a brake force booster with an elastic reaction element, and input member with an associated effective surface, an output member with an associated effective surface, and a first transmission ratio that is defined by a ratio of the effective surfaces being in operative engagement with the reaction element. An object of the present invention is to provide means of a simple design, if possible arranged in the form of an assembly, giving the operator of an automotive vehicle increased support when high braking forces are required. The essence of the invention is the provision of means which starting from a determined pressure prevailing in the reaction element will reduce the reaction force introduced into the input member by a defined amount. The driver is thus given additional support, requiring a proportionately reduced increase in input force for a further increase in output force.

Abstract: Vacuum brake booster for motor vehicles comprising a booster housing 7 whose interior is subdivided by a movable wall 4 into a vacuum chamber 30 and a working chamber 20, a control valve 1 that controls a pressure difference acting upon the movable wall 4 and is accommodated in a control housing 2 that carries the movable wall 4, said control valve being composed of two concentrically arranged sealing seats 9, 10 and an elastically deformable valve member 11, wherein the control housing 2 includes a cavity 40 through which a cross member 60 extends and delimits the axial movability of a valve piston 16 relative to the control housing 2, and the cross member 60 includes at least one projection 62, 80 made of an elastic material in the area where the cross member 60 rests against the booster housing 7. The core of the invention is that at least one projection 66, 84, 85, 88, 90 made of an elastic material is provided in the area of points of abutment between the control housing 2 and the cross member 60.

Abstract: A hydraulic brake system for vehicles with a brake pressure generator unit which is operable by introducing an actuating force by way of an actuating device that includes a first hydraulic chamber having a volume which decreases when the brake pressure generator unit is actuated, out of which pressure fluid volume is displaced due to the volume decrease and to which wheel brakes are connected by way of a first hydraulic connection, wherein a pump is arranged which is capable of delivering the pressure fluid volume displaced out of the first hydraulic chamber due to the volume decrease into the wheel brakes. The first hydraulic chamber includes an elastic device by which a force/travel characteristic curve is determined in the actuating device when an actuating force is introduced.

Abstract: In order to impart to the vehicle operator the usual feeling at the brake pedal in an electrohydraulic brake system of the ‘brake-by-wire’ type or ensure a pre-selected flexibility of the brake pedal by means of an electrically controllable valve assembly, the invention discloses that the electrically controllable valve assembly is formed of the separating valve, a pressure regulating or control valve connected to the outlet side of the separating valve and having its outlet port connected to the pressure fluid reservoir, as well as further valves that allow applying the pressure introduced into at least one wheel brake and/or the pressure generated by the pressure source to the pressure chamber of the master brake cylinder.

Abstract: In a vacuum brake booster of a vehicle braking system, comprising a vacuum housing that is subdivided by at least one movable partition into at least one vacuum chamber and at least one working chamber, comprising a sensor unit adapted to sense the pressure in the vacuum chamber and the pressure in the working chamber or the difference in pressure between the working chamber and the vacuum chamber, an electronic control unit is associated with the vacuum brake booster and includes an evaluation unit for the purpose of evaluating the sensed pressures in the vacuum chamber and the working chamber or the difference in pressure between the working chamber and the vacuum chamber. The electronic control unit includes an actuation unit for the purpose of actuating an active hydraulic brake force boosting unit on the basis of the evaluation by the evaluation unit.

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 invention relates to a brake force transmission device for a brake force amplifier with an elastic reaction element (7), an input body (22), with an associated working surface (d4), an output body (24), with an associated working surface (d4), with a first transfer ratio, defined by a working surface ratio, actively dependent on the reaction element (7). The aim of the invention is to provide a means, of simple construction, where possible arranged in the form of an assembly, which gives the driver of a motor vehicle increased support when high braking force is required. According to the invention, means (2,4, 6,11) are provided, which reduce the reaction force supplied to the input body (22) by a certain proportion, after a certain pressure in the reaction element (7). The driver is thus given additional support and a relatively reduced increase in input force is required for a further increase in output force.