Abstract: A control device for a hydraulic control motor includes at least one valve controlled actively by an actuating force and at least one passive valve which is operatively connected to the actively controlled valve and which is co-controlled via a line.

Abstract: An actuation device, e.g., with actuation by an electromagnet, includes an adjustable part, e.g., a return plate, which is secured to a housing by a return spring, and a fixed part, e.g., a magnet core. The return spring is secured to a pin, and the adjustable part, e.g., return plate, is connected to the pin. The pin has a collar. The return spring is clamped in between the collar and a spring which bears against the adjustable part. In the non-actuated state there is a precisely determined basic air gap between the adjustable part and the fixed part. The collar may be adjusted on the pin. This is achieved in that the adjustable collar is formed by a nut which may be adjusted by a thread which is arranged on the pin. The nut may also be replaced by an adjustment element which may be secured, for example, a pressed-on ring.

Abstract: A hydropneumatic suspension system for motor vehicles, having at least one hydropneumatic support aggregate and one automatic level control system cooperating with the aggregate, the automatic level control system, as a function of the lift position of the wheels, sending hydraulic fluid from the hydropneumatic pressure reservoir into the hydropneumatic suspension cylinders, or drawing hydraulic fluid from the hydropneumatic suspension cylinders into the pressure reservoirs, and the functions of suspension, roll stabilization, and automatic level control being able to be performed using the hydropneumatic suspension cylinders.

Abstract: A radial piston machine, e.g., a radial piston pump, in which an eccentric, rotatable on a stationary axle, drives multiple radially arranged pistons via an external sliding ring. Since a pump of this type operates with intake regulation, the delivery chambers are only partially filled above a middle speed range. Therefore, pressure surges, which cause noises, arise upon the impact of the piston on the oil volumes to be pushed out. These pressure surges may be reduced if a flexible circlip is positioned between the external sliding ring and the eccentric. Such a circlip allows the piston to deflect slightly together with the external sliding ring at the beginning of the pressure stroke, so that pressure peaks are suppressed and the noises are reduced. The flexibility of the circlip is increased using openings, which are positioned along the central axis, i.e., in the plane of the piston axle.

Abstract: An electrically assisted power steering system for motor vehicles includes an input shaft (2) that is in working engagement with a steering wheel (4). The input shaft (2) is used to transfer a torque necessary for steering wheels that are to be steered. An output member is in working engagement with the wheels to be steered. An electric motor (7), by way of which a power assist may be exerted on the input shaft (2) or the output member, is arranged on the power steering system. A detection unit (10) is provided to ascertain the parameters for the equipment variant of the vehicle present in each case. The ascertained parameters are conveyed to the electronics unit (9) for adapted control of the electric motor (7). The parameters for the equipment variant of the vehicle present in each case include values for the specific front axle load of the vehicle and/or for the tire characteristic of the vehicle.

Abstract: A cut-off valve for power steering systems, especially for automobiles, includes a source of a pressure and a container, and is used for limiting a pressure in at least one pressure chamber. The cut-off valve also includes a closing body, which may be adjusted against the force of a spring and a fixed throttling point, which is located in a connecting line between the pressure chamber that is subjected to a first pressure and a pressure chamber that is subjected to a second pressure. The cross-section of the throttling point may be regulated without being disassembled from the outside. By altering the cross-section of the throttle point, it is possible to reduce the width of the tolerance zone or the width of the hysteresis of the valve characteristics to approximately half of the original size.

Abstract: In a damping valve for pressure medium-actuated operating circuits, a spring element is installed between housing, cover and counter-contour. In the opening direction, the spring element is pressed against the counter-contour by the pressure medium flowing through, so that a flow passage cross-section allowing almost unimpeded passage of the pressure medium is obtained. In the opposite direction, the throttling direction, the spring element rests on the cover and blocks the flow of the pressure medium until a well-defined pressure builds up, which lifts the inner side of the spring element from the counter-contour and thus opens a reduced flow passage cross-section.

Abstract: A steering column support includes a bearing block with guide rail and a guide part for the steering column, the guide part having a slide section. A sliding block, sliding in the guide rail, is arranged between the slide section and guide rail. A high efficiency factor, inexpensive production and freedom from play may be ensured by the following features without reworking/adjustment: the sliding block is made of flexible material and is dimensioned such that it compensates for the play between the slide section and the guide rail; the slide section and the guide rail are made of sheet-steel molded parts; the sliding block is surrounded by one of the parts in such a way that an additional securing and retention in the longitudinal direction of the guide rail is dispensable; the slide section and the guide rail intermesh in such a way that a mutual emergency guidance without derailment remains, even if the sliding block is destroyed; and the sliding block is swing-mounted in the slide section.

Abstract: A rotary disk valve for motor vehicle power steering systems includes rotary disk which is connected non-rotatably to a valve inlet element. A control bushing is connected non-rotatably to a valve outlet element. These two valve elements are disposed so that they are coaxially movable into one another and are rotatable by at most the amount of torsion of a dead travel coupling. The two valve elements have longitudinal control grooves, which interact with one another for controlling a pressure medium to and from two working areas of a servo motor and to a return connection for a pressure medium container. The rotary disk is connected via a torsion bar spring to the valve outlet element. The longitudinal control grooves of the radially internal valve element connected to the return connection are connected to an internal space of the radially internal valve element. The torsion bar spring is supported in this internal space via a roller bearing.

Abstract: A device for the suspension and for roll stabilization of motor vehicles achieves the required roll stiffness as well as the required lift stiffness without any additional springs by coordinating the ratio of the piston areas to the piston ring areas of the spring cylinders with simultaneous active engagement by an actuator integrated between the cross-wired lines.

Abstract: A method for producing a blank for a gear rack for rack-and-pinion steering of motor vehicles includes the following steps: In a first step, a starting material having an essentially circular cross-section is placed into a stamping apparatus containing at least three form tools movable relatively to one another. In a second step, at least one force in at least one direction is exerted upon at least one of the form tools, the form tools moving relative to one another by this force, so that the starting material is reformed into a blank for the gear rack. At least in the axial region of the tooth system of the gear rack to be formed, the blank is provided with a shape differing from a circular cylinder. Using this method, part of the material of the starting material is displaced on one side from the middle into the region of the tooth system to be formed, without having much strain-hardening occur in this region. This makes subsequent production processes easier.

Abstract: A gear pump for the power steering of a motor vehicle is integrated into the housing of the drive unit and is surrounded by both the discharge space and the intake space, which extend over the entire length of the housing Ribs are provided in the discharge space for pulsation damping and for stabilization of the pressure field. A filter space is provided between the cover and a filter cap.

Abstract: In a power steering system having hydraulic power support for motor vehicles, a steering gear shaft having a steering wheel is connected to an input element of a steering gear. An output element of the steering gear is connected to wheels of the vehicle to be steered. Two working chambers of a servo motor of a power boosting system can be supplied with a hydraulic medium from a servo pump through a steering valve in accordance with a torque applied in the area of the steering gear shaft input element. Two sensors for detecting an angle of rotation and a torque are provided on the steering gear shaft and on the output element of the steering gear accordingly. After the steering wheel has been released after a steering operation, the wheels to be steered and the steering gear can be returned with hydraulic support. Both the intensity and direction of the hydraulic power support as well as the returning of the wheels to be steered are controlled by a common, electronically controlled electromagnetic valve.

Abstract: A multiway rotary valve includes two valve elements for directing a pressurized medium to and from two working chambers of a servomotor and to a return connection for a pressurized-media vessel. The two valve elements can rotate relatively to each other. One valve element has a cavity, in which two planar control surfaces facing each other are disposed. The other valve element is a planar disk, which has two planar control surfaces facing away from each other. The planar control surfaces of the two valve elements have control openings that interact with each other. The inner valve element can be rotated by a limited angle by an actuator. The actuator, in the form of, for example, an impacting rod acts upon the valve element in a tangential direction. The valve element is designed as a semicircular disk, upon the radial contact surfaces of which the two impacting rods act, the two impacting rods being controllable by electromagnets.

Abstract: Actuator having at least three coupling elements connected with stabilizers (3, 5) and coupling splines (4, 16, 17), wherein one axially movable coupling element (10) is prestressed by a spring (11) while the other coupling elements are firmly connected with said stabilizers, and a pressure chamber (12) whose internal pressure regulates the disengagement operation.

Abstract: An electrically supported power steering system for motor vehicles includes an input shaft, which is mechanically linked to a steering wheel for transmitting a steering torque required for steering of wheels to be steered. An output element is mechanically linked to the wheels to be steered. An electric motor, through which a servo force can be applied directly or indirectly to the output element, is arranged on the power steering system. The input shaft and the output element are connected to one another via a torsion bar. A detection unit for detection of a torque acting on the input shaft and of other steering-specific parameters includes a single pulse generator designed as a magnet ring and at least one magnetoresistive sensor.

Abstract: A method for assembling a rotary valve for hydraulic power assisted steering systems may be used for a rotary valve having the following features: both valve elements of the rotary valve have longitudinal control grooves, interacting control edges of the longitudinal control grooves of the control bushing and of the rotary slide being formed parallel to each other and converging in an oblique manner at the same angle in relation to the longitudinal axis of the rotary valve. The method includes the following steps: the rotary slide is pushed into the control bushing up to a point just ahead of a stop in the region of the valve output member. The two valve elements of the rotary valve are aligned in their central position and are clamped there in a manner secure against rotation in relation to a torsion bar spring. In order to determine the profile of a basic characteristic curve, the rotary valve is deflected fully in both directions and the pressure/angle or the pressure/torque ratio is recorded.

Abstract: A rotary slide valve (1) for power steering in motor vehicles contains a rotary slide (2), which is non-rotatably connected to a valve inlet member (4). The control bushing (3) is non-rotatably connected to a valve outlet member (5). The two valve elements are disposed so that they can move coaxially inside each other and can be maximally rotated in relation to each other over the rotational path of a lost motion coupling. The outside of the rotary slide (2) and the inside of the control bushing have control longitudinal grooves (6, 7), which cooperate with one another in order to direct a pressure fluid to and from two working areas of a servomotor The rotary slide (2) is connected to the valve outlet member (5) by means of a torsion bar spring (9). Manufacture conditional tolerances that can lead to undesirable effects in the driving behavior are compensated for by means of a play-free suspension connection (10).