Abstract: A mounted piston ring for a piston/cylinder unit. The piston ring covers a circumferential surface of the piston and seals it off from the cylinder. The piston ring has a width which is greater than the height of the circumferential surface, so that there is an axially projecting length of the piston ring relative to the piston. This axially projecting length is shaped into a spring end which is axially supported on a top side of the piston. One spring end having a circular-arc-shaped transition which is designed to be between 90° and 180°, and which spring end comes to bear on the first top side of the piston. The other spring end having an annular bearing surface, comes to bear in the region of the opposite second top side of the piston. In this region the other spring end, with respect to the shaping angle, is adapted to the angle between the circumferential surface and the second top side.

Abstract: A pressure-dependent valve, for use with an adjustable vibration damper comprising a piston rod arranged in an axially movable fashion in a cylindrical tube filled with damping fluid, is controlled by a pressure transducer pressurized via a pressure connection opening. The pressure-dependent valve includes a valve body axially movable relative to a valve surface. The valve body and valve surface together determine a valve passage cross-section. The pressure transducer is float-mounted in a pressure space and supported by at least one spring. One of the valve parts determining the valve passage cross-section is movable relative to the current position of the pressure transducer by an adjustment device.

Abstract: Adjusting device for the automatic operation of a gear-change device with a shifting shaft associated with linear drives to introduce a rotational and a translatory movement. To convert an introduced translatory movement into a rotational movement, the linear drive provided to introduce rotational movement is actively connected to the shifting shaft by an articulated connection having two support elements that are urged toward each other by a prestress force and an articulated element actively connected in a force locking position between the two support elements by the prestress force.

Abstract: A release mechanism for a motor vehicle friction clutch for cooperation with a motor vehicle transmission having subdivided switching steps. The mechanism includes a release member displaceable by a compressed air for carrying out a clutch release process, a valve arrangement for selectively supplying the compressed air, and a measurement arrangement for detecting an actual release position of the release member. The valve arrangement carries out the application of pressure fluid to the release member in accordance with (1) a reference variable provided by an actuation arrangement and which represents a reference release position of the release member, and (2) the detected actual release position. The measurement arrangement is so constructed that when the detected actual release position exceeds a predetermined switching threshold release position, a shifting signal is provided for shifting the transmission in subdivided switching steps.

Abstract: A torsional vibration damper includes a main damper arrangement with side disks which are fixedly connected to one another by welding to a flange ring and connected to an input part of the vibration damper. The side disks are coupled in a torsionally elastic manner with a central disk by first spring elements. The central disk is connected to the output part. A predamper arrangement is arranged axially to the side of the main damper arrangement and includes first and second predamper components which are coupled with one another in a torsionally elastic manner by second spring elements. The output part has a radially projecting projection which runs circumferentially at least partially and is arranged between the second predamper component and the main damper arrangement and fixes the main damper arrangement axially.

Abstract: A lockup clutch in a hydrodynamic torque converter has an axially movable piston which can be pressed against a contact face of a flange of the converter housing in a switching position via at least one friction facing. At least one of the structural component parts of the flange of the converter housing or the piston serves as a carrier for a deformation element axially arranged between it and the other structural component part. The deformation element is connected with the carrier on at least one radial side and is in a working connection with the carrier at least at the other radial side via an elastic supporting device. The deformation element extends at least within the area of extension of the friction facing.

Abstract: A positioning device for an output component for automatically shifting gears of a motor vehicle transmission that undergoes two types of movements comprises a plurality of drives. The movement of each drive can be transmitted via a transmission mechanism to the output component. A first drive causes the output component to undergo movement of a first type, and a second drive causes the output component to undergo movement of a second type. The first drive is connected to a sliding element. The sliding element is axially fixed, but movable in the circumferential direction relative to the output component. The second drive is rotatably fixed, but axially movable output component.

Abstract: A hydrodynamic clutch device is constructed with a clutch housing which is in a working connection with at least one drive. The hydrodynamic, clutch device has a hydrodynamic circuit formed at least by an impeller wheel and turbine wheel. The speed of the impeller wheel is adjustable corresponding to the speed of the housing, and the drive is connected with the impeller wheel via a transmission for carrying out a change in the speed.

Abstract: A hydrodynamic clutch device is formed with a hydrodynamic circuit comprising at least an impeller and turbine wheel and with a residual circuit in which is provided at least a lockup clutch for fixing the turbine wheel relative to a drive. The residual circuit is supplied, via a hydraulic supply system, with switchable pressure medium lines for controlling the lockup clutch. The hydrodynamic circuit is at least substantially isolated from the residual circuit by a dividing wall and is at least partially filled with a medium whose density exceeds that of the medium used for supplying the residual circuit.

Abstract: A torsional vibration damping device for rotating clutch disks which interact with internal combustion engines includes two coaxial cover disks which are held together and are rotatable about an axis of rotation within a fixed angular range relative to an internally located part. A number of torsion springs are circumferentially arranged between the cover disks and the internally located part which may comprise one of an intermediate disk, side disk, spring, drive disk. The cover disks are axially loaded by a spring force in opposing directions and a distance between the cover plate is fixed by axial distance pieces which are connected between the cover plates. The cover disks and the internally located part are arranged on a hub furnished with splines. At least one stop surface is configured on the external splines of the hub so that the internally located part is supported in the axial direction against the stop surface for axially securing the hub.

Abstract: An indentation in a surface of a plastically deformable material, in particular metal, having a curved section at the base of the indentation. The curved section is adjoined in the direction of the surface by a further section which has the shape of a parabola in cross section.

Abstract: An actuator for an electromagnetically adjustable valve having a drive unit which moves an adjustment element in at least one direction. The adjustment element is divided into at least two assemblies and includes a stroke setting that can be adjusted with respect to a defined operating position, within an adjustment process. The actuator has a reference plane on which a stop can be attached as a setting device. One assembly of the adjustment element enters into operative connection with the stop during the assembly process, and the other assembly of the adjustment element is held in a defined operating position by a positioning device. The two assemblies of the adjustment element can be connected using a securing device which is effective in at least one direction.

Abstract: Device for controlling a starting process, which comprises an engine equipped with a power regulating element. The position of the power regulating element, which is equipped with an actuator, can be controlled by a control device, to which signals are sent indicating the activation position of an accelerator pedal as well as the speed of a crankshaft of the engine. The crankshaft can be connected via a clutch to a gear input shaft. When a predetermined speed limit value of the crankshaft is reached, the actuator of the power regulating element can be activated by the control device for the purpose of limiting the crankshaft speed. A clutch pedal is provided, by means of whose activation the starting process can be controlled.

Abstract: Friction facings of a clutch disk, especially for friction clutches in motor vehicles, wherein the friction coefficient varies along the radial extension of the friction facings such that the friction coefficient in the radial outer region has a lower value than the friction coefficient in the radial inner region.

Abstract: Disclosed is a hydropneumatic vibration damper of variable damping force, with a cylinder which is arranged between a piston rod guide and a bottom valve and in which a piston provided with at least one valve and connected to a piston rod subdivides the cylinder interior filled with damping fluid into a working space located on the piston rod side and a lower working space. A container surrounds the cylinder at a radial distance, thereby forming a compensating space which is filled with damping fluid and gas, while the lower working space can be connected hydraulically to the compensating space via a bottom valve and an electromagnetically actuable valve device is provided between the interior of the cylinder and the compensating space. The entire electromagnetically actuable valve device, taking effect between the interior of the cylinder, preferably the working space located on the piston rod side, and the compensating space, is arranged on that side of the bottom valve which is opposite the cylinder.

Abstract: A process for connecting a flywheel with a clutch housing, including the following steps:a) providing the flywheel with a connection portion,b) providing the housing with a substantially cylindrical counter-connection portion, andc) sliding the housing on the connection portion by its counter-connection portion in a sliding direction substantially parallel to an axis of rotation for producing a press connection between the flywheel and housing. Step a) includes making the flywheel available with an insertion area which widens radially in the slide-on direction with respect to the axis of rotation and with a taper area following the insertion area that narrows in diameter in the slide-on direction. Step b) includes making the housing available with an inner dimension in the counter-connection portion, which inner dimension is smaller than an outer dimension of the flywheel in the area of a transition from the insertion area to the taper area.

Abstract: A piston for a piston-cylinder unit comprises a piston body having passages which connect two spaces in a cylinder on opposing sides of the piston. The passages are covered by at least one valve disk which is centered relative to a center of the piston by a centering sleeve. A spring element is arranged between the piston body and the centering sleeve. This spring element, when mounted, spaces the centering element from the piston body and accordingly displaces the useful range of the centering element until the piston is assembled in its entirety and every structural component part of the piston occupies its intended position.

Abstract: A spring strut with a steering knuckle, the spring strut having a tubular body to which the steering knuckle is fastened by a screw connection. The steering knuckle has a continuous slot which, together with the fastener, forms a clamping connection between the tubular body and the steering knuckle. A positioning connection, including a recess and an engagement part, exactly aligns the tubular body and steering knuckle with one another in the circumferential direction.

Abstract: A torsional vibration damper at a bridge clutch of a hydrodynamic torque converter is constructed with a drive-side transmission element which can be brought into a working connection with the converter housing and is connected with a driven-side transmission element by a coupling mechanism provided with an energy accumulator acting in the circumferential direction. The driven-side transmission element is fixed with respect to rotation relative to a driven-side structural component part of the torque converter. The transmission elements, together with the coupling device, form a gear unit with gear unit elements via which the secondary diagonal of the mass matrix is occupied for forming a decoupling frequency.

Abstract: A torque converter according to the present invention includes a converter housing, a turbine wheel arranged in the converter housing so as to be rotatable relative thereto around a converter rotational axis (A), and a bridge coupling for the substantially rotation-proof selective connection of the turbine wheel to the converter housing. The bridge coupling has a coupling mechanism connected in substantially rotation-proof fashion to the turbine wheel and includes a friction surface which may be selectively brought to rest on a counter friction surface on the converter housing or selectively connected in rotation-proof fashion thereto. The friction surface is provided on a friction surface carrier connected in rotation-proof fashion to a coupling component that is rotatable with the turbine wheel. The coupling component is pivotable relative to the friction surface carrier around a circumferential line or a circumferential line region naming around the converter rotational axis (A).