Abstract: A switch over valve, in particular for controlling a hydraulic fluid flow, comprising: a contact element; and a sleeve shaped connecting section including a first bore hole for connecting with a first hydraulic fluid conduit, a second bore hole for connecting with a second hydraulic fluid conduit, and a relief bore hole for connecting with a relief channel, wherein the contact element is arranged in the sleeve shaped connecting section and optionally displaceable into a first switching position or a second switching position, wherein the first hydraulic fluid conduit is connected with the relief channel in the first switching position and the second hydraulic fluid conduit is connected with the relief channel in the second switching position, characterized in that the cut off valves are provided which are integrated into the switch over valve.

Abstract: A cam phaser including a rotor; and a stator, wherein the rotor is rotatable relative to the stator, wherein a lobe of the rotor is arrangeable between two bars of the stator, wherein the lobe divides an intermediary space formed between the two bars into a first pressure cavity and a second pressure cavity, wherein a locking device including a spring loaded locking bolt and a locking disc is configured to lock the stator relative to the rotor in an end position, wherein the locking provides a locking clearance for moving the rotor relative to the stator, wherein the locking disc includes a contact element for adjusting the end position.

Abstract: A hydraulic valve for a cam phaser, the hydraulic valve including a bushing element, including a longitudinal channel, a first transversal channel originating from the longitudinal channel, a second transversal channel originating from the longitudinal channel, a pressure balanced hollow piston arranged within the longitudinal channel axially moveable between a first end position and a second end position, wherein the longitudinal channel includes a first channel section with a larger inner diameter and a second channel section with a smaller inner diameter, wherein the first transversal channel originates from the first channel section and the second transversal channel originates from the second channel section, wherein the hollow piston includes a longitudinal channel with an axial opening, at least one transversal channel, a first piston section with a greater outer diameter and a second piston section with a smaller outer diameter.

Abstract: A hydraulic valve, in particular a cartridge valve including a valve piston that is supported axially movable in a valve bushing and by which at least one operating connection, advantageously two operating connections are alternatively connectable with a supply connection and a tank drain, wherein the connections are configured with respect to a longitudinal axis of the valve bushing as slotted holes that extend over a limited distance in a circumferential direction and which are respectively protected by a screen element configured as a metal band which covers the slotted hole with a filter portion, wherein the screen element is arranged in a first groove enveloping the slotted hole and envelops the valve bushing in a second groove originating from the first groove on two sides, characterized in that the screen element includes a filter mask which includes a welding portion at a first end.

Abstract: A hydraulic valve including a valve bushing; a valve piston that is axially moveable in the valve bushing along a longitudinal axis of the valve bushing; a supply connection configured to feed a hydraulic fluid; at least one operating connection; and at least one tank drain configured to drain the hydraulic fluid, wherein the valve piston is movable by an electromagnetic actuator of the hydraulic valve and the valve bushing forms a hydraulic portion and the actuator forms a magnetic portion of the hydraulic valve, characterized in that a seal element is arranged in the valve bushing which seal element provides a spatial separation of the magnet portion and the hydraulic portion, and wherein the seal element is penetrated by an end of the valve piston configured as a piston plunger.

Abstract: A hydraulic valve, in particular a hydraulic transmission valve including a magnetizable housing which envelops a magnet coil at an outer circumference and at least at one face of the magnet coil; a pole cap arranged in an interior of the housing, wherein the pole cap includes a pole core and a pole tube arranged in an axial sequence towards a face of the magnet coil, wherein the pole core and the pole tube are integrally connected in one piece by a connection bar, wherein the pole core is connected with the connection bar by a pole core cone and/or the pole tube is connected with the connection bar by a pole tube cone, and wherein the pole tube includes an end that is closed with a termination plate at a face of the pole tube that is oriented away from the connection bar.

Abstract: The invention relates to a screen for a hydraulic valve including a band plate with screen openings wherein the screen openings form etched functional contours. The invention also relates to a hydraulic valve with the screen.

Abstract: A cartridge valve including a hydraulic bushing including at least one connection which is configured as a slotted hole extending over a defined portion of a circumference of the hydraulic bushing with respect to a longitudinal axis of the hydraulic bushing and which is protected by a screen insert inserted into the slotted hole. According to the invention the slotted hole includes a receiving groove that is configured at least over a portion of a circumference of the slotted hole, and the screen insert is arrangeable so that its outer edge is at least partially supported between a shoulder configured in the receiving groove and a cover tongue of the receiving groove wherein the cover tongue is arranged opposite to the shoulder.

Abstract: A hydraulic valve for a cam phaser, the hydraulic valve including a bushing element, including a longitudinal channel, a pressure medium connection that is arranged at an end of the longitudinal channel, three hydraulic connections that originate from the longitudinal channel, and a pressure balanced hollow piston that is arranged axially moveable within the longitudinal channel, characterized in that the hydraulic valve includes a check valve at the pressure medium connection and a cam phaser including a stator and a rotor that is rotatable relative to the stator between a first end position and a second end position for adjusting a cam shaft of an internal combustion engine and a hydraulic valve for controlling a rotation of the rotor.

Abstract: A valve timing control device, in effect a cam phaser, for an internal combustion engine. The valve timing control device includes a rotor connected to a camshaft and having a plurality of vanes. A stator is engaged with the rotor, and includes a plurality of webs. Pressure chambers are provided between each of the webs and vanes. The cam phaser is configured to automatically locate to its mid-lock position, without having to rely on electronic control. At least one embodiment of the present invention is configured to use cam torque to recirculate oil from one side of the vanes of the rotor to the other.

Abstract: A hydraulic valve for a cam phaser including a pressure balanced hollow piston that is arranged axially movable, wherein the hollow piston at its end oriented towards the pressure medium connection includes a first piston section with a first small outer diameter, and adjacent to the first piston section a second piston section with a second large outer diameter, and a third piston section with a third medium outer diameter, wherein the hollow piston includes a respective pressure surface for pressure compensation at the first piston section and at the third piston section which are respectively loadable with an axial force that is oriented away from the pressure medium connection when the hollow piston is loaded with pressure, wherein a resultant force of the axial forces impacts the hollow piston, and another pressure surface is provided at the second piston section of the hollow piston.

Abstract: A cam phaser including an electromagnetically actuated hydraulic valve; and a hollow piston inserted in a borehole and longitudinally movable by an electromagnet so that a hydraulic fluid is distributed to operating connections associated with pressure cavities of the cam phaser, wherein a first operating connection branches off from a borehole directly adjacent to the electromagnet, wherein the hollow piston includes a circumferential bar with a control edge oriented towards the electromagnet so that a cavity within the borehole is defined on one side by the circumferential bar and on another side by the electromagnet, wherein a drain opening extends from the cavity, wherein the drain opening hydraulically connects the cavity with a drain channel leading towards a tank drain, wherein the bar is movable into a direction expanding the first operating connection in the flow cross section by a force of the electromagnet that is loaded with electrical current.

Abstract: A hydraulic valve, in particular for a cam phaser of a cam shaft, the hydraulic valve including a supply connection with a check valve for supplying a hydraulic fluid; at least one first operating connection and a second operating connection; at least one first tank outlet and a second tank outlet for draining the hydraulic fluid; a piston that is moveable in a bore hole along a longitudinal direction of the bore hole for distributing the hydraulic fluid from the supply connection to the first operating connection and/or the second operating connection and for conducting the hydraulic fluid from the first operating connection to the second operating connection and from the first operating connection to the first tank outlet and/or from the second operating connection to the second tank outlet; and a sleeve that is arranged in the piston moveable relative to the piston in the longitudinal direction.

Abstract: An internal combustion engine with adjustable compression ratio with a connecting rod bearing eye for connecting to a piston of at least one cylinder and an eccentrical element adjustment device for adjusting an effective connecting rod length, and wherein the eccentrical element adjustment device includes an eccentrical element cooperating with an eccentrical element lever and eccentrical element rods engaging the eccentrical element lever, wherein the eccentrical element rods are loaded with a hydraulic pressure that is provided in hydraulic cavities interacting with the eccentrical element rods, wherein the eccentrical element lever includes at least one eccentrical element lever segment, wherein the at least one eccentrical element lever segment is positioned in axial direction of the eccentrical element in front and/or behind the connecting rod bearing eye, and wherein the at least one eccentrical element lever segment is fixated at the eccentrical element.

Abstract: An actuator for a hydraulic valve of a cam phaser, the actuator including a magnet housing receiving a magnetized metal sleeve and a coil that is radially enveloped by the magnetized metal sleeve generating a magnetic field, wherein the coil is fixated in a non-magnetizable coil carrier that is positioned in a cavity of the magnet housing, wherein the coil carrier at least partially envelops a pole core and a pole core yoke that is axially offset from the pole core, wherein the pole core and a pole core yoke are positioned so that they radially define a non-magnetic sleeve, wherein the non-magnetic sleeve forms a divider wall between the cavity of the magnet housing and an inner cavity of the non-magnetic sleeve.

Abstract: In a hydraulic valve comprising a spool, one or more band-shape check valves and an enclosing bolt or snout, the check valve may be compressed to the point of excessive wear or failure and may impede spool movement. The problem outlined is solved by an inventive hydraulic valve for use with a cam phasing apparatus of an internal combustion engine. The hydraulic valve comprises a hollow bolt or snout, check valves, and a spool disposed inside the bolt while still being able to shift axially within the bolt. The bolt and spool are configured to provide fluid passageways between the spool and the cam phasing apparatus depending on a translational displacement of the spool. Furthermore, the spool is configured to allow an oil flow through the fluid passageway, yet limit a compression of the band-type check valves.

Abstract: A hydraulic valve for a cam phaser including a valve housing with a longitudinal axis and a valve piston that is axially moveable along the longitudinal axis, wherein the valve piston opens and closes a first operating connection of the valve housing and a second operating connection of the valve housing, wherein the first operating connection and the second operating connection are axially offset from one another; and a supply connection of the valve housing which is used for supplying the hydraulic valve with a hydraulic fluid fed by a feed device, wherein the hydraulic valve is configured to be flowed through by the hydraulic fluid on different paths controlled by a flow permeable channel system of the valve piston, and wherein a check valve opening and closing an inflow channel is arranged in the hydraulic valve in the inflow channel of the valve housing.

Abstract: A hydraulic valve for use with a lockable cam phaser. The hydraulic valve is configured to limit the flow of pressure medium to both the advance and retard chambers, while allowing a locking pin of the cam phaser to drain. The hydraulic valve effectively limits flow during the self-centering operation of the can phaser. This is important for the system function, since it allows the phaser to select a side (i.e., the advance or retard chamber) to bleed off, reducing pressure on that side, which allows the cam phaser to move towards the mid-park (i.e., locking) position.

Abstract: A valve timing control device for an internal combustion engine. The valve timing control device includes a rotor connected to a camshaft and having a plurality of vanes. A stator is engaged with the rotor, and includes a plurality of webs. Pressure chambers are provided between each of the webs and vanes. A centering slot is provided on the stator and/or the rotor. A pressure medium control valve is disposed in one of the vanes of the rotor, and is configured to not only selectively lock and unlock the position of the rotor relative to the stator, but is also configured such that pressure medium in the pressure chambers is ventable through the centering slot and thereafter through the pressure medium control valve.

Abstract: An oscillating-motor camshaft adjuster which provides that, through software, camshaft alternating torque is utilized only in conditions where the torque is adequate and/or it is important to reduce flow consumption. If there is two step lift and the camshaft alternating torque is not adequate in low lift, software can position the spool to utilize some camshaft alternating torque while also tanking oil to speed up the phasing.